Daily bump.

[official-gcc.git] / gcc / analyzer / ChangeLog

2021-11-12  David Malcolm  <dmalcolm@redhat.com>

        * engine.cc (exploded_node::on_stmt_pre): Return when handling
        "__analyzer_dump_state".

2021-11-11  Richard Biener  <rguenther@suse.de>

        * supergraph.cc: Include bitmap.h.

2021-11-04  David Malcolm  <dmalcolm@redhat.com>

        * program-state.cc (sm_state_map::dump): Use default_tree_printer
        as format decoder.

2021-09-16  Maxim Blinov  <maxim.blinov@embecosm.com>

        PR bootstrap/102242
        * engine.cc (INCLUDE_UNIQUE_PTR): Define.

2021-09-08  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/102225
        * analyzer.h (compat_types_p): New decl.
        * constraint-manager.cc
        (constraint_manager::get_or_add_equiv_class): Guard against NULL
        type when checking for pointer types.
        * region-model-impl-calls.cc (region_model::impl_call_realloc):
        Guard against NULL lhs type/region.  Guard against the size value
        not being of a compatible type for dynamic extents.
        * region-model.cc (compat_types_p): Make non-static.

2021-08-30  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/99260
        * analyzer.h (class custom_edge_info): New class, adapted from
        exploded_edge::custom_info_t.  Make member functions const.
        Make update_model return bool, converting edge param from
        reference to a pointer, and adding a ctxt param.
        (class path_context): New class.
        * call-info.cc: New file.
        * call-info.h: New file.
        * engine.cc: Include "analyzer/call-info.h" and <memory>.
        (impl_region_model_context::impl_region_model_context): Update for
        new m_path_ctxt field.
        (impl_region_model_context::bifurcate): New.
        (impl_region_model_context::terminate_path): New.
        (impl_region_model_context::get_malloc_map): New.
        (impl_sm_context::impl_sm_context): Update for new m_path_ctxt
        field.
        (impl_sm_context::get_fndecl_for_call): Likewise.
        (impl_sm_context::set_next_state): Likewise.
        (impl_sm_context::warn): Likewise.
        (impl_sm_context::is_zero_assignment): Likewise.
        (impl_sm_context::get_path_context): New.
        (impl_sm_context::m_path_ctxt): New.
        (impl_region_model_context::on_condition): Update for new
        path_ctxt param.  Handle m_enode_for_diag being NULL.
        (impl_region_model_context::on_phi): Update for new path_ctxt
        param.
        (exploded_node::on_stmt): Add path_ctxt param, updating ctor calls
        to use it as necessary.  Use it to bail out after sm-handling,
        if needed.
        (exploded_node::detect_leaks): Update for new path_ctxt param.
        (dynamic_call_info_t::update_model): Update for conversion of
        exploded_edge::custom_info_t to custom_edge_info.
        (dynamic_call_info_t::add_events_to_path): Likewise.
        (rewind_info_t::update_model): Likewise.
        (rewind_info_t::add_events_to_path): Likewise.
        (exploded_edge::exploded_edge): Likewise.
        (exploded_graph::add_edge): Likewise.
        (exploded_graph::maybe_process_run_of_before_supernode_enodes):
        Update for new path_ctxt param.
        (class impl_path_context): New.
        (exploded_graph::process_node): Update for new path_ctxt param.
        Create an impl_path_context and pass it to exploded_node::on_stmt.
        Use it to terminate iterating stmts if terminate_path is called
        on it.  After processing a run of stmts, query path_ctxt to
        potentially terminate the analysis path, and/or to "bifurcate" the
        analysis into multiple additional paths.
        (feasibility_state::maybe_update_for_edge): Update for new
        update_model ctxt param.
        * exploded-graph.h
        (impl_region_model_context::impl_region_model_context): Add
        path_ctxt param.
        (impl_region_model_context::bifurcate): New.
        (impl_region_model_context::terminate_path): New
        (impl_region_model_context::get_ext_state): New.
        (impl_region_model_context::get_malloc_map): New.
        (impl_region_model_context::m_path_ctxt): New field.
        (exploded_node::on_stmt): Add path_ctxt param.
        (class exploded_edge::custom_info_t): Move to analyzer.h, renaming
        to custom_edge_info, and making the changes as noted in analyzer.h
        above.
        (exploded_edge::exploded_edge): Update for these changes to
        exploded_edge::custom_info_t.
        (exploded_edge::m_custom_info): Likewise.
        (class dynamic_call_info_t): Likewise.
        (class rewind_info_t): Likewise.
        (exploded_graph::add_edge): Likewise.
        * program-state.cc (program_state::on_edge): Update for new
        path_ctxt param.
        (program_state::push_call): Likewise.
        (program_state::returning_call): Likewise.
        (program_state::prune_for_point): Likewise.
        * region-model-impl-calls.cc: Include "analyzer/call-info.h".
        (call_details::get_fndecl_for_call): New.
        (region_model::impl_call_realloc): Reimplement.
        * region-model.cc (region_model::on_call_pre): Move call to
        impl_call_realloc to...
        (region_model::on_call_post): ...here.  Consolidate creation
        of call_details instance.
        (noop_region_model_context::bifurcate): New.
        (noop_region_model_context::terminate_path): New.
        * region-model.h (call_details::get_call_stmt): New.
        (call_details::get_fndecl_for_call): New.
        (region_model::on_realloc_with_move): New.
        (region_model_context::bifurcate): New.
        (region_model_context::terminate_path): New.
        (region_model_context::get_ext_state): New.
        (region_model_context::get_malloc_map): New.
        (noop_region_model_context::bifurcate): New.
        (noop_region_model_context::terminate_path): New.
        (noop_region_model_context::get_ext_state): New.
        (noop_region_model_context::get_malloc_map): New.
        * sm-malloc.cc: Include "analyzer/program-state.h".
        (malloc_state_machine::on_realloc_call): Reimplement.
        (malloc_state_machine::on_realloc_with_move): New.
        (region_model::on_realloc_with_move): New.
        * sm-signal.cc (class signal_delivery_edge_info_t): Update for
        conversion from exploded_edge::custom_info_t to custom_edge_info.
        * sm.h (sm_context::get_path_context): New.
        * svalue.cc (svalue::maybe_get_constant): Call
        unwrap_any_unmergeable.

2021-08-25  Ankur Saini  <arsenic@sourceware.org>

        PR analyzer/101980
        * engine.cc (exploded_graph::maybe_create_dynamic_call): Don't create
        calls if max recursion limit is reached.

2021-08-23  David Malcolm  <dmalcolm@redhat.com>

        * analyzer.h (struct rejected_constraint): Convert to...
        (class rejected_constraint): ...this.
        (class bounded_ranges): New forward decl.
        (class bounded_ranges_manager): New forward decl.
        * constraint-manager.cc: Include "analyzer/analyzer-logging.h" and
        "tree-pretty-print.h".
        (can_plus_one_p): New.
        (plus_one): New.
        (can_minus_one_p): New.
        (minus_one): New.
        (bounded_range::bounded_range): New.
        (dump_cst): New.
        (bounded_range::dump_to_pp): New.
        (bounded_range::dump): New.
        (bounded_range::to_json): New.
        (bounded_range::set_json_attr): New.
        (bounded_range::contains_p): New.
        (bounded_range::intersects_p): New.
        (bounded_range::operator==): New.
        (bounded_range::cmp): New.
        (bounded_ranges::bounded_ranges): New.
        (bounded_ranges::bounded_ranges): New.
        (bounded_ranges::bounded_ranges): New.
        (bounded_ranges::canonicalize): New.
        (bounded_ranges::validate): New.
        (bounded_ranges::operator==): New.
        (bounded_ranges::dump_to_pp): New.
        (bounded_ranges::dump): New.
        (bounded_ranges::to_json): New.
        (bounded_ranges::eval_condition): New.
        (bounded_ranges::contain_p): New.
        (bounded_ranges::cmp): New.
        (bounded_ranges_manager::~bounded_ranges_manager): New.
        (bounded_ranges_manager::get_or_create_empty): New.
        (bounded_ranges_manager::get_or_create_point): New.
        (bounded_ranges_manager::get_or_create_range): New.
        (bounded_ranges_manager::get_or_create_union): New.
        (bounded_ranges_manager::get_or_create_intersection): New.
        (bounded_ranges_manager::get_or_create_inverse): New.
        (bounded_ranges_manager::consolidate): New.
        (bounded_ranges_manager::get_or_create_ranges_for_switch): New.
        (bounded_ranges_manager::create_ranges_for_switch): New.
        (bounded_ranges_manager::make_case_label_ranges): New.
        (bounded_ranges_manager::log_stats): New.
        (bounded_ranges_constraint::print): New.
        (bounded_ranges_constraint::to_json): New.
        (bounded_ranges_constraint::operator==): New.
        (bounded_ranges_constraint::add_to_hash): New.
        (constraint_manager::constraint_manager): Update for new field
        m_bounded_ranges_constraints.
        (constraint_manager::operator=): Likewise.
        (constraint_manager::hash): Likewise.
        (constraint_manager::operator==): Likewise.
        (constraint_manager::print): Likewise.
        (constraint_manager::dump_to_pp): Likewise.
        (constraint_manager::to_json): Likewise.
        (constraint_manager::add_unknown_constraint): Update the lhs_ec_id
        if necessary in existing constraints when combining equivalence
        classes.  Add similar code for handling
        m_bounded_ranges_constraints.
        (constraint_manager::add_constraint_internal): Add comment.
        (constraint_manager::add_bounded_ranges): New.
        (constraint_manager::eval_condition): Use new field
        m_bounded_ranges_constraints.
        (constraint_manager::purge): Update bounded_ranges_constraint
        instances.
        (constraint_manager::canonicalize): Update for new field.
        (merger_fact_visitor::on_ranges): New.
        (constraint_manager::for_each_fact): Use new field
        m_bounded_ranges_constraints.
        (constraint_manager::validate):  Fix off-by-one error needed due
        to bug fixed above in add_unknown_constraint.  Validate the EC IDs
        in m_bounded_ranges_constraints.
        (constraint_manager::get_range_manager): New.
        (selftest::assert_dump_bounded_range_eq): New.
        (ASSERT_DUMP_BOUNDED_RANGE_EQ): New.
        (selftest::test_bounded_range): New.
        (selftest::assert_dump_bounded_ranges_eq): New.
        (ASSERT_DUMP_BOUNDED_RANGES_EQ): New.
        (selftest::test_bounded_ranges): New.
        (selftest::run_constraint_manager_tests): Call the new selftests.
        * constraint-manager.h (struct bounded_range): New.
        (struct bounded_ranges): New.
        (template <> struct default_hash_traits<bounded_ranges::key_t>): New.
        (class bounded_ranges_manager): New.
        (fact_visitor::on_ranges): New pure virtual function.
        (class bounded_ranges_constraint): New.
        (constraint_manager::add_bounded_ranges): New decl.
        (constraint_manager::get_range_manager): New decl.
        (constraint_manager::m_bounded_ranges_constraints): New field.
        * diagnostic-manager.cc (epath_finder::process_worklist_item):
        Transfer ownership of rc to add_feasibility_problem.
        * engine.cc (feasibility_problem::dump_to_pp): Use get_model.
        * feasible-graph.cc (infeasible_node::dump_dot): Update for
        conversion of m_rc to a pointer.
        (feasible_graph::add_feasibility_problem): Pass RC by pointer and
        take ownership.
        * feasible-graph.h (infeasible_node::infeasible_node): Pass RC by
        pointer and take ownership.
        (infeasible_node::~infeasible_node): New.
        (infeasible_node::m_rc): Convert to a pointer.
        (feasible_graph::add_feasibility_problem): Pass RC by pointer and
        take ownership.
        * region-model-manager.cc: Include
        "analyzer/constraint-manager.h".
        (region_model_manager::region_model_manager): Initializer new
        field m_range_mgr.
        (region_model_manager::~region_model_manager): Delete it.
        (region_model_manager::log_stats): Call log_stats on it.
        * region-model.cc (region_model::add_constraint): Use new subclass
        rejected_op_constraint.
        (region_model::apply_constraints_for_gswitch): Reimplement using
        bounded_ranges_manager.
        (rejected_constraint::dump_to_pp): Convert to...
        (rejected_op_constraint::dump_to_pp): ...this.
        (rejected_ranges_constraint::dump_to_pp): New.
        * region-model.h (struct purge_stats): Add field
        m_num_bounded_ranges_constraints.
        (region_model_manager::get_range_manager): New.
        (region_model_manager::m_range_mgr): New.
        (region_model::get_range_manager): New.
        (struct rejected_constraint): Split into...
        (class rejected_constraint):...this new abstract base class,
        and...
        (class rejected_op_constraint): ...this new concrete subclass.
        (class rejected_ranges_constraint): New.
        * supergraph.cc: Include "tree-cfg.h".
        (supergraph::supergraph): Drop idx param from add_cfg_edge.
        (supergraph::add_cfg_edge): Drop idx param.
        (switch_cfg_superedge::switch_cfg_superedge): Move here from
        header.  Populate m_case_labels with all cases which go to DST.
        (switch_cfg_superedge::dump_label_to_pp): Reimplement to use
        m_case_labels.
        (switch_cfg_superedge::get_case_label): Delete.
        * supergraph.h (supergraphadd_cfg_edge): Drop "idx" param.
        (switch_cfg_superedge::switch_cfg_superedge): Drop idx param and
        move implementation to supergraph.cc.
        (switch_cfg_superedge::get_case_label): Delete.
        (switch_cfg_superedge::get_case_labels): New.
        (switch_cfg_superedge::m_idx): Delete.
        (switch_cfg_superedge::m_case_labels): New field.

2021-08-23  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/101875
        * sm-file.cc (file_diagnostic::describe_state_change): Handle
        change.m_expr being NULL.

2021-08-23  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/101837
        * analyzer.cc (maybe_reconstruct_from_def_stmt): Bail if fn is
        NULL, and assert that it's non-NULL before passing it to
        build_call_array_loc.

2021-08-23  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/101962
        * region-model.cc (region_model::eval_condition_without_cm):
        Refactor comparison against zero, adding a check for
        POINTER_PLUS_EXPR of non-NULL.

2021-08-23  David Malcolm  <dmalcolm@redhat.com>

        * store.cc (bit_range::intersects_p): New overload.
        (bit_range::operator-): New.
        (binding_cluster::maybe_get_compound_binding): Handle the partial
        overlap case.
        (selftest::test_bit_range_intersects_p): Add test coverage for
        new overload of bit_range::intersects_p.
        * store.h (bit_range::intersects_p): New overload.
        (bit_range::operator-): New.

2021-08-23  Ankur Saini  <arsenic@sourceware.org>

        PR analyzer/102020
        * diagnostic-manager.cc
        (diagnostic_manager::prune_for_sm_diagnostic)<case EK_CALL_EDGE>: Fix typo.

2021-08-21  Ankur Saini  <arsenic@sourceware.org>

        PR analyzer/101980
        * diagnostic-manager.cc
        (diagnostic_manager::prune_for_sm_diagnostic)<case EK_CALL_EDGE>: Use
        caller_model only when the supergraph_edge doesn't exixt.
        (diagnostic_manager::prune_for_sm_diagnostic)<case EK_RETURN_EDGE>:
        Likewise.
        * engine.cc (exploded_graph::create_dynamic_call): Rename to...
        (exploded_graph::maybe_create_dynamic_call): ...this, return call
        creation status.
        (exploded_graph::process_node): Handle calls which were not dynamically
        discovered.
        * exploded-graph.h (exploded_graph::create_dynamic_call): Rename to...
        (exploded_graph::maybe_create_dynamic_call): ...this.
        * region-model.cc (region_model::update_for_gcall): New param, use it
        to push call to frame.
        (region_model::update_for_call_superedge): Pass callee function to
        update_for_gcall.
        * region-model.h (region_model::update_for_gcall): New param.

2021-08-18  Ankur Saini  <arsenic@sourceware.org>

        PR analyzer/97114
        * region-model.cc (region_model::get_rvalue_1): Add case for
        OBJ_TYPE_REF.

2021-08-18  Ankur Saini  <arsenic@sourceware.org>

        PR analyzer/100546
        * analysis-plan.cc (analysis_plan::use_summary_p): Don't use call
        summaries if there is no callgraph edge
        * checker-path.cc (call_event::call_event): Handle calls events that
        are not represented by a supergraph call edge
        (return_event::return_event): Likewise.
        (call_event::get_desc): Work with new call_event structure.
        (return_event::get_desc): Likeise.
        * checker-path.h (call_event::m_src_snode): New field.
        (call_event::m_dest_snode): New field.
        (return_event::m_src_snode): New field.
        (return_event::m_dest_snode): New field.
        * diagnostic-manager.cc
        (diagnostic_manager::prune_for_sm_diagnostic)<case EK_CALL_EDGE>:
        Refactor to work with edges without callgraph edge.
        (diagnostic_manager::prune_for_sm_diagnostic)<case EK_RETURN_EDGE>:
        Likewise.
        * engine.cc (dynamic_call_info_t::update_model): New function.
        (dynamic_call_info_t::add_events_to_path): New function.
        (exploded_graph::create_dynamic_call): New function.
        (exploded_graph::process_node): Work with dynamically discovered calls.
        * exploded-graph.h (class dynamic_call_info_t): New class.
        (exploded_graph::create_dynamic_call): New decl.
        * program-point.cc (program_point::push_to_call_stack): New function.
        (program_point::pop_from_call_stack): New function.
        * program-point.h (program_point::push_to_call_stack): New decl.
        (program_point::pop_from_call_stack): New decl.
        * program-state.cc (program_state::push_call): New function.
        (program_state::returning_call): New function.
        * program-state.h (program_state::push_call): New decl.
        (program_state::returning_call): New decl.
        * region-model.cc (region_model::update_for_gcall) New function.
        (region_model::update_for_return_gcall): New function.
        (egion_model::update_for_call_superedge): Get the underlying gcall and
        update for gcall.
        (region_model::update_for_return_superedge): Likewise.
        * region-model.h (region_model::update_for_gcall): New decl.
        (region_model::update_for_return_gcall): New decl.
        * state-purge.cc (state_purge_per_ssa_name::process_point): Update to
        work with calls without underlying cgraph edge.
        * supergraph.cc (supergraph::supergraph) Split snodes at every callsite.
        * supergraph.h (supernode::get_returning_call) New accessor.

2021-08-04  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/101570
        * analyzer.cc (maybe_reconstruct_from_def_stmt): Add GIMPLE_ASM
        case.
        * analyzer.h (class asm_output_svalue): New forward decl.
        (class reachable_regions): New forward decl.
        * complexity.cc (complexity::from_vec_svalue): New.
        * complexity.h (complexity::from_vec_svalue): New decl.
        * engine.cc (feasibility_state::maybe_update_for_edge): Handle
        asm stmts by calling on_asm_stmt.
        * region-model-asm.cc: New file.
        * region-model-manager.cc
        (region_model_manager::maybe_fold_asm_output_svalue): New.
        (region_model_manager::get_or_create_asm_output_svalue): New.
        (region_model_manager::log_stats): Log m_asm_output_values_map.
        * region-model.cc (region_model::on_stmt_pre): Handle GIMPLE_ASM.
        * region-model.h (visitor::visit_asm_output_svalue): New.
        (region_model_manager::get_or_create_asm_output_svalue): New decl.
        (region_model_manager::maybe_fold_asm_output_svalue): New decl.
        (region_model_manager::asm_output_values_map_t): New typedef.
        (region_model_manager::m_asm_output_values_map): New field.
        (region_model::on_asm_stmt): New.
        * store.cc (binding_cluster::on_asm): New.
        * store.h (binding_cluster::on_asm): New decl.
        * svalue.cc (svalue::cmp_ptr): Handle SK_ASM_OUTPUT.
        (asm_output_svalue::dump_to_pp): New.
        (asm_output_svalue::dump_input): New.
        (asm_output_svalue::input_idx_to_asm_idx): New.
        (asm_output_svalue::accept): New.
        * svalue.h (enum svalue_kind): Add SK_ASM_OUTPUT.
        (svalue::dyn_cast_asm_output_svalue): New.
        (class asm_output_svalue): New.
        (is_a_helper <const asm_output_svalue *>::test): New.
        (struct default_hash_traits<asm_output_svalue::key_t>): New.

2021-08-03  Jakub Jelinek  <jakub@redhat.com>

        PR analyzer/101721
        * sm-malloc.cc (known_allocator_p): Only check DECL_FUNCTION_CODE on
        BUILT_IN_NORMAL builtins.

2021-07-29  Ankur Saini  <arsenic@sourceware.org>

        * call-string.cc (call_string::element_t::operator==): New operator.
        (call_String::element_t::operator!=): New operator.
        (call_string::element_t::get_caller_function): New function.
        (call_string::element_t::get_callee_function): New function.
        (call_string::call_string): Refactor to Initialise m_elements.
        (call_string::operator=): Refactor to work with m_elements.
        (call_string::operator==): Likewise.
        (call_string::to_json): Likewise.
        (call_string::hash): Refactor to hash e.m_caller.
        (call_string::push_call): Refactor to work with m_elements.
        (call_string::push_call): New overload to push call via supernodes.
        (call_string::pop): Refactor to work with m_elements.
        (call_string::calc_recursion_depth): Likewise.
        (call_string::cmp): Likewise.
        (call_string::validate): Likewise.
        (call_string::operator[]): Likewise.
        * call-string.h (class supernode): New forward decl.
        (struct call_string::element_t): New struct.
        (call_string::call_string): Refactor to initialise m_elements.
        (call_string::bool empty_p): Refactor to work with m_elements.
        (call_string::get_callee_node): New decl.
        (call_string::get_caller_node): New decl.
        (m_elements): Replaces m_return_edges.
        * program-point.cc (program_point::get_function_at_depth): Refactor to
        work with new call-string format.
        (program_point::validate): Likewise.
        (program_point::on_edge): Likewise.

2021-07-28  David Malcolm  <dmalcolm@redhat.com>

        * region-model.cc (region_model::on_call_pre): Treat
        IFN_UBSAN_BOUNDS, BUILT_IN_STACK_SAVE, and BUILT_IN_STACK_RESTORE
        as no-ops, rather than handling them as unknown functions.

2021-07-28  David Malcolm  <dmalcolm@redhat.com>

        * region-model-impl-calls.cc (region_model::impl_call_alloca):
        Drop redundant return value.
        (region_model::impl_call_builtin_expect): Likewise.
        (region_model::impl_call_calloc): Likewise.
        (region_model::impl_call_malloc): Likewise.
        (region_model::impl_call_memset): Likewise.
        (region_model::impl_call_operator_new): Likewise.
        (region_model::impl_call_operator_delete): Likewise.
        (region_model::impl_call_strlen): Likewise.
        * region-model.cc (region_model::on_call_pre): Fix return value of
        known functions that don't have unknown side-effects.
        * region-model.h (region_model::impl_call_alloca): Drop redundant
        return value.
        (region_model::impl_call_builtin_expect): Likewise.
        (region_model::impl_call_calloc): Likewise.
        (region_model::impl_call_malloc): Likewise.
        (region_model::impl_call_memset): Likewise.
        (region_model::impl_call_strlen): Likewise.
        (region_model::impl_call_operator_new): Likewise.
        (region_model::impl_call_operator_delete): Likewise.

2021-07-28  Siddhesh Poyarekar  <siddhesh@gotplt.org>

        * analyzer.cc (is_named_call_p, is_std_named_call_p): Make
        first argument a const_tree.
        * analyzer.h (is_named_call_p, -s_std_named_call_p): Likewise.
        * sm-malloc.cc (known_allocator_p): New function.
        (malloc_state_machine::on_stmt): Use it.

2021-07-28  Siddhesh Poyarekar  <siddhesh@gotplt.org>

        * sm-malloc.cc
        (malloc_state_machine::get_or_create_deallocator): Recognize
        __builtin_free.

2021-07-26  David Malcolm  <dmalcolm@redhat.com>

        * region-model.cc (region_model::on_call_pre): Always set conjured
        LHS, not just for SSA names.

2021-07-23  David Malcolm  <dmalcolm@redhat.com>

        * diagnostic-manager.cc
        (class auto_disable_complexity_checks): New.
        (epath_finder::explore_feasible_paths): Use it to disable
        complexity checks whilst processing the worklist.
        * region-model-manager.cc
        (region_model_manager::region_model_manager): Initialize
        m_check_complexity.
        (region_model_manager::reject_if_too_complex): Bail if
        m_check_complexity is false.
        * region-model.h
        (region_model_manager::enable_complexity_check): New.
        (region_model_manager::disable_complexity_check): New.
        (region_model_manager::m_check_complexity): New.

2021-07-21  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/101547
        * sm-file.cc (file_leak::emit): Handle m_arg being NULL.
        (file_leak::describe_final_event): Handle ev.m_expr being NULL.

2021-07-21  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/101522
        * store.cc (binding_cluster::purge_state_involving): Don't change
        m_map whilst iterating through it.

2021-07-21  David Malcolm  <dmalcolm@redhat.com>

        * region-model.cc (region_model::handle_phi): Add "old_state"
        param and use it.
        (region_model::update_for_phis): Update so that all of the phi
        stmts are effectively handled simultaneously, rather than in
        order.
        * region-model.h (region_model::handle_phi): Add "old_state"
        param.
        * state-purge.cc (self_referential_phi_p): Replace with...
        (name_used_by_phis_p): ...this new function.
        (state_purge_per_ssa_name::process_point): Update to use the
        above, so that all phi stmts at a basic block are effectively
        considered simultaneously, and only consider the phi arguments for
        the pertinent in-edge.
        * supergraph.cc (cfg_superedge::get_phi_arg_idx): New.
        (cfg_superedge::get_phi_arg): Use the above.
        * supergraph.h (cfg_superedge::get_phi_arg_idx): New decl.

2021-07-21  David Malcolm  <dmalcolm@redhat.com>

        * state-purge.cc (state_purge_annotator::add_node_annotations):
        Rather than erroneously always using the NULL in-edge, determine
        each relevant in-edge, and print the appropriate data for each
        in-edge.  Use print_needed to print the data as comma-separated
        lists of SSA names.
        (print_vec_of_names): Add "within_table" param and use it.
        (state_purge_annotator::add_stmt_annotations): Factor out
        collation and printing code into...
        (state_purge_annotator::print_needed): ...this new function.
        * state-purge.h (state_purge_annotator::print_needed): New decl.

2021-07-21  David Malcolm  <dmalcolm@redhat.com>

        * program-point.cc (function_point::print): Show src BB index at
        BEFORE_SUPERNODE.

2021-07-21  David Malcolm  <dmalcolm@redhat.com>

        * svalue.cc (infix_p): New.
        (binop_svalue::dump_to_pp): Use it to print MIN_EXPR and MAX_EXPR
        in prefix form, rather than infix.

2021-07-19  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/101503
        * constraint-manager.cc (constraint_manager::add_constraint): Use
        can_have_associated_state_p rather than testing for unknown.
        (constraint_manager::get_or_add_equiv_class): Likewise.
        * program-state.cc (sm_state_map::set_state): Likewise.
        (sm_state_map::impl_set_state): Add assertion.
        * region-model-manager.cc
        (region_model_manager::maybe_fold_unaryop): Handle poisoned
        values.
        (region_model_manager::maybe_fold_binop): Move handling of unknown
        values...
        (region_model_manager::get_or_create_binop): ...to here, and
        generalize to use can_have_associated_state_p.
        (region_model_manager::maybe_fold_sub_svalue): Use
        can_have_associated_state_p rather than testing for unknown.
        (region_model_manager::maybe_fold_repeated_svalue): Use unknown
        when the size or repeated value is "unknown"/"poisoned".
        * region-model.cc (region_model::purge_state_involving): Reject
        attempts to purge unknown/poisoned svalues, as these svalues
        should not have state associated with them.
        * svalue.cc (sub_svalue::sub_svalue): Assert that we're building
        on top of an svalue with can_have_associated_state_p.
        (repeated_svalue::repeated_svalue): Likewise.
        (bits_within_svalue::bits_within_svalue): Likewise.
        * svalue.h (svalue::can_have_associated_state_p): New.
        (unknown_svalue::can_have_associated_state_p): New.
        (poisoned_svalue::can_have_associated_state_p): New.
        (unaryop_svalue::unaryop_svalue): Assert that we're building on
        top of an svalue with can_have_associated_state_p.
        (binop_svalue::binop_svalue): Likewise.
        (widening_svalue::widening_svalue): Likewise.

2021-07-16  David Malcolm  <dmalcolm@redhat.com>

        * analyzer.h (enum access_direction): New.
        * engine.cc (exploded_node::on_longjmp): Update for new param of
        get_store_value.
        * program-state.cc (program_state::prune_for_point): Likewise.
        * region-model-impl-calls.cc (region_model::impl_call_memcpy):
        Replace call to check_for_writable_region with call to
        check_region_for_write.
        (region_model::impl_call_memset): Likewise.
        (region_model::impl_call_strcpy): Likewise.
        * region-model-reachability.cc (reachable_regions::add): Update
        for new param of get_store_value.
        * region-model.cc (region_model::get_rvalue_1): Likewise, also for
        get_rvalue_for_bits.
        (region_model::get_store_value): Add ctxt param and use it to call
        check_region_for_read.
        (region_model::get_rvalue_for_bits): Add ctxt param and use it to
        call get_store_value.
        (region_model::check_region_access): New.
        (region_model::check_region_for_write): New.
        (region_model::check_region_for_read): New.
        (region_model::set_value): Update comment.  Replace call to
        check_for_writable_region with call to check_region_for_write.
        * region-model.h (region_model::get_rvalue_for_bits): Add ctxt
        param.
        (region_model::get_store_value): Add ctxt param.
        (region_model::check_region_access): New decl.
        (region_model::check_region_for_write): New decl.
        (region_model::check_region_for_read): New decl.
        * region.cc (region_model::copy_region): Update call to
        get_store_value.
        * svalue.cc (initial_svalue::implicitly_live_p): Likewise.

2021-07-16  David Malcolm  <dmalcolm@redhat.com>

        * engine.cc (exploded_node::on_stmt_pre): Handle
        __analyzer_dump_state.
        * program-state.cc (extrinsic_state::get_sm_idx_by_name): New.
        (program_state::impl_call_analyzer_dump_state): New.
        * program-state.h (extrinsic_state::get_sm_idx_by_name): New decl.
        (program_state::impl_call_analyzer_dump_state): New decl.
        * region-model-impl-calls.cc
        (call_details::get_arg_string_literal): New.
        * region-model.h (call_details::get_arg_string_literal): New decl.

2021-07-16  David Malcolm  <dmalcolm@redhat.com>

        * program-state.cc (program_state::detect_leaks): Simplify using
        svalue::maybe_get_region.
        * region-model-impl-calls.cc (region_model::impl_call_fgets): Likewise.
        (region_model::impl_call_fread): Likewise.
        (region_model::impl_call_free): Likewise.
        (region_model::impl_call_operator_delete): Likewise.
        * region-model.cc (selftest::test_stack_frames): Likewise.
        (selftest::test_state_merging): Likewise.
        * svalue.cc (svalue::maybe_get_region): New.
        * svalue.h (svalue::maybe_get_region): New decl.

2021-07-15  David Malcolm  <dmalcolm@redhat.com>

        * svalue.h (is_a_helper <placeholder_svalue *>::test): Make
        param and template param const.
        (is_a_helper <widening_svalue *>::test): Likewise.
        (is_a_helper <compound_svalue *>::test): Likewise.
        (is_a_helper <conjured_svalue *>::test): Likewise.

2021-07-15  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/95006
        PR analyzer/94713
        PR analyzer/94714
        * analyzer.cc (maybe_reconstruct_from_def_stmt): Split out
        GIMPLE_ASSIGN case into...
        (get_diagnostic_tree_for_gassign_1): New.
        (get_diagnostic_tree_for_gassign): New.
        * analyzer.h (get_diagnostic_tree_for_gassign): New decl.
        * analyzer.opt (Wanalyzer-write-to-string-literal): New.
        * constraint-manager.cc (class svalue_purger): New.
        (constraint_manager::purge_state_involving): New.
        * constraint-manager.h
        (constraint_manager::purge_state_involving): New.
        * diagnostic-manager.cc (saved_diagnostic::supercedes_p): New.
        (dedupe_winners::handle_interactions): New.
        (diagnostic_manager::emit_saved_diagnostics): Call it.
        * diagnostic-manager.h (saved_diagnostic::supercedes_p): New decl.
        * engine.cc (impl_region_model_context::warn): Convert return type
        to bool.  Return false if the diagnostic isn't saved.
        (impl_region_model_context::purge_state_involving): New.
        (impl_sm_context::get_state): Use NULL ctxt when querying old
        rvalue.
        (impl_sm_context::set_next_state): Use new sval when querying old
        state.
        (class dump_path_diagnostic): Move to region-model.cc
        (exploded_node::on_stmt): Move to on_stmt_pre and on_stmt_post.
        Remove call to purge_state_involving.
        (exploded_node::on_stmt_pre): New, based on the above.  Move most
        of it to region_model::on_stmt_pre.
        (exploded_node::on_stmt_post): Likewise, moving to
        region_model::on_stmt_post.
        (class stale_jmp_buf): Fix parent class to use curiously recurring
        template pattern.
        (feasibility_state::maybe_update_for_edge): Call on_call_pre and
        on_call_post on gcalls.
        * exploded-graph.h (impl_region_model_context::warn): Return bool.
        (impl_region_model_context::purge_state_involving): New decl.
        (exploded_node::on_stmt_pre): New decl.
        (exploded_node::on_stmt_post): New decl.
        * pending-diagnostic.h (pending_diagnostic::use_of_uninit_p): New.
        (pending_diagnostic::supercedes_p): New.
        * program-state.cc (sm_state_map::get_state): Inherit state for
        conjured_svalue as well as initial_svalue.
        (sm_state_map::purge_state_involving): Also support SK_CONJURED.
        * region-model-impl-calls.cc (call_details::get_uncertainty):
        Handle m_ctxt being NULL.
        (call_details::get_or_create_conjured_svalue): New.
        (region_model::impl_call_fgets): New.
        (region_model::impl_call_fread): New.
        * region-model-manager.cc
        (region_model_manager::get_or_create_initial_value): Return an
        uninitialized poisoned value for regions that can't have initial
        values.
        * region-model-reachability.cc
        (reachable_regions::mark_escaped_clusters): Handle ctxt being
        NULL.
        * region-model.cc (region_to_value_map::purge_state_involving): New.
        (poisoned_value_diagnostic::use_of_uninit_p): New.
        (poisoned_value_diagnostic::emit): Handle POISON_KIND_UNINIT.
        (poisoned_value_diagnostic::describe_final_event): Likewise.
        (region_model::check_for_poison): New.
        (region_model::on_assignment): Call it.
        (class dump_path_diagnostic): Move here from engine.cc.
        (region_model::on_stmt_pre): New, based on exploded_node::on_stmt.
        (region_model::on_call_pre): Move the setting of the LHS to a
        conjured svalue to before the checks for specific functions.
        Handle "fgets", "fgets_unlocked", and "fread".
        (region_model::purge_state_involving): New.
        (region_model::handle_unrecognized_call): Handle ctxt being NULL.
        (region_model::get_rvalue): Call check_for_poison.
        (selftest::test_stack_frames): Use NULL for context when getting
        uninitialized rvalue.
        (selftest::test_alloca): Likewise.
        * region-model.h (region_to_value_map::purge_state_involving): New
        decl.
        (call_details::get_or_create_conjured_svalue): New decl.
        (region_model::on_stmt_pre): New decl.
        (region_model::purge_state_involving): New decl.
        (region_model::impl_call_fgets): New decl.
        (region_model::impl_call_fread): New decl.
        (region_model::check_for_poison): New decl.
        (region_model_context::warn): Return bool.
        (region_model_context::purge_state_involving): New.
        (noop_region_model_context::warn): Return bool.
        (noop_region_model_context::purge_state_involving): New.
        (test_region_model_context:: warn): Return bool.
        * region.cc (region::get_memory_space): New.
        (region::can_have_initial_svalue_p): New.
        (region::involves_p): New.
        * region.h (enum memory_space): New.
        (region::get_memory_space): New decl.
        (region::can_have_initial_svalue_p): New decl.
        (region::involves_p): New decl.
        * sm-malloc.cc (use_after_free::supercedes_p): New.
        * store.cc (binding_cluster::purge_state_involving): New.
        (store::purge_state_involving): New.
        * store.h (class symbolic_binding): New forward decl.
        (binding_key::dyn_cast_symbolic_binding): New.
        (symbolic_binding::dyn_cast_symbolic_binding): New.
        (binding_cluster::purge_state_involving): New.
        (store::purge_state_involving): New.
        * svalue.cc (svalue::can_merge_p): Reject attempts to merge
        poisoned svalues with other svalues, so that we identify
        paths in which a variable is conditionally uninitialized.
        (involvement_visitor::visit_conjured_svalue): New.
        (svalue::involves_p): Also handle SK_CONJURED.
        (poison_kind_to_str): Handle POISON_KIND_UNINIT.
        (poisoned_svalue::maybe_fold_bits_within): New.
        * svalue.h (enum poison_kind): Add POISON_KIND_UNINIT.
        (poisoned_svalue::maybe_fold_bits_within): New decl.

2021-07-15  David Malcolm  <dmalcolm@redhat.com>

        * analyzer.opt (fdump-analyzer-exploded-paths): New.
        * diagnostic-manager.cc
        (diagnostic_manager::emit_saved_diagnostic): Implement it.
        * engine.cc (exploded_path::dump_to_pp): Add ext_state param and
        use it to dump states if non-NULL.
        (exploded_path::dump): Likewise.
        (exploded_path::dump_to_file): New.
        * exploded-graph.h (exploded_path::dump_to_pp): Add ext_state
        param.
        (exploded_path::dump): Likewise.
        (exploded_path::dump): Likewise.
        (exploded_path::dump_to_file): New.

2021-07-15  David Malcolm  <dmalcolm@redhat.com>

        * analyzer.cc (fixup_tree_for_diagnostic_1): Use DECL_DEBUG_EXPR
        if it's available.
        * engine.cc (readability): Likewise.

2021-07-15  David Malcolm  <dmalcolm@redhat.com>

        * state-purge.cc (self_referential_phi_p): New.
        (state_purge_per_ssa_name::process_point): Don't purge an SSA name
        at its def-stmt if the def-stmt is self-referential.

2021-07-07  David Malcolm  <dmalcolm@redhat.com>

        * diagnostic-manager.cc (null_assignment_sm_context::get_state):
        New overload.
        (null_assignment_sm_context::set_next_state): New overload.
        (null_assignment_sm_context::get_diagnostic_tree): New.
        * engine.cc (impl_sm_context::get_state): New overload.
        (impl_sm_context::set_next_state): New overload.
        (impl_sm_context::get_diagnostic_tree): New overload.
        (impl_region_model_context::on_condition): Convert params from
        tree to const svalue *.
        * exploded-graph.h (impl_region_model_context::on_condition):
        Likewise.
        * region-model.cc (region_model::on_call_pre): Move handling of
        internal calls to before checking for get_fndecl_for_call.
        (region_model::add_constraints_from_binop): New.
        (region_model::add_constraint): Split out into a new overload
        working on const svalue * rather than tree.  Call
        add_constraints_from_binop.  Drop call to
        add_any_constraints_from_ssa_def_stmt.
        (region_model::add_any_constraints_from_ssa_def_stmt): Delete.
        (region_model::add_any_constraints_from_gassign): Delete.
        (region_model::add_any_constraints_from_gcall): Delete.
        * region-model.h
        (region_model::add_any_constraints_from_ssa_def_stmt): Delete.
        (region_model::add_any_constraints_from_gassign): Delete.
        (region_model::add_any_constraints_from_gcall): Delete.
        (region_model::add_constraint): Add overload decl.
        (region_model::add_constraints_from_binop): New decl.
        (region_model_context::on_condition): Convert params from tree to
        const svalue *.
        (noop_region_model_context::on_condition): Likewise.
        * sm-file.cc (fileptr_state_machine::condition): Likewise.
        * sm-malloc.cc (malloc_state_machine::on_condition): Likewise.
        * sm-pattern-test.cc: Include tristate.h, selftest.h,
        analyzer/call-string.h, analyzer/program-point.h,
        analyzer/store.h, and analyzer/region-model.h.
        (pattern_test_state_machine::on_condition): Convert params from tree to
        const svalue *.
        * sm-sensitive.cc (sensitive_state_machine::on_condition): Delete.
        * sm-signal.cc (signal_state_machine::on_condition): Delete.
        * sm-taint.cc (taint_state_machine::on_condition): Convert params
        from tree to const svalue *.
        * sm.cc: Include tristate.h, selftest.h, analyzer/call-string.h,
        analyzer/program-point.h, analyzer/store.h, and
        analyzer/region-model.h.
        (any_pointer_p): Add overload taking const svalue *sval.
        * sm.h (any_pointer_p): Add overload taking const svalue *sval.
        (state_machine::on_condition): Convert params from tree to
        const svalue *.  Provide no-op default implementation.
        (sm_context::get_state): Add overload taking const svalue *sval.
        (sm_context::set_next_state): Likewise.
        (sm_context::on_transition): Likewise.
        (sm_context::get_diagnostic_tree): Likewise.
        * svalue.cc (svalue::all_zeroes_p): New.
        (constant_svalue::all_zeroes_p): New.
        (repeated_svalue::all_zeroes_p): Convert to vfunc.
        * svalue.h (svalue::all_zeroes_p): New decl.
        (constant_svalue::all_zeroes_p): New decl.
        (repeated_svalue::all_zeroes_p): Convert decl to vfunc.

2021-06-30  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/95006
        * analyzer.h (class repeated_svalue): New forward decl.
        (class bits_within_svalue): New forward decl.
        (class sized_region): New forward decl.
        (get_field_at_bit_offset): New forward decl.
        * engine.cc (exploded_graph::get_or_create_node): Validate the
        merged state.
        (exploded_graph::maybe_process_run_of_before_supernode_enodes):
        Validate the states at each stage.
        * program-state.cc (program_state::validate): Validate
        m_region_model.
        * region-model-impl-calls.cc (region_model::impl_call_memset):
        Replace special-case logic for handling constant sizes with
        a call to fill_region of a sized_region with the given fill value.
        * region-model-manager.cc (maybe_undo_optimize_bit_field_compare):
        Drop DK_direct.
        (region_model_manager::maybe_fold_sub_svalue):  Fold element-based
        subregions of an initial value into initial values of an element.
        Fold subvalues of repeated svalues.
        (region_model_manager::maybe_fold_repeated_svalue): New.
        (region_model_manager::get_or_create_repeated_svalue): New.
        (get_bit_range_for_field): New.
        (get_byte_range_for_field): New.
        (get_field_at_byte_range): New.
        (region_model_manager::maybe_fold_bits_within_svalue): New.
        (region_model_manager::get_or_create_bits_within): New.
        (region_model_manager::get_sized_region): New.
        (region_model_manager::log_stats): Update for addition of
        m_repeated_values_map, m_bits_within_values_map, and
        m_sized_regions.
        * region-model.cc (region_model::validate): New.
        (region_model::on_assignment): Drop enum binding_kind.
        (region_model::get_initial_value_for_global): Likewise.
        (region_model::get_rvalue_for_bits): Replace body with call to
        get_or_create_bits_within.
        (region_model::get_capacity): Handle RK_SIZED.
        (region_model::set_value): Drop enum binding_kind.
        (region_model::fill_region): New.
        (region_model::get_representative_path_var_1): Handle RK_SIZED.
        * region-model.h (visitor::visit_repeated_svalue): New.
        (visitor::visit_bits_within_svalue): New.
        (region_model_manager::get_or_create_repeated_svalue): New decl.
        (region_model_manager::get_or_create_bits_within): New decl.
        (region_model_manager::get_sized_region): New decl.
        (region_model_manager::maybe_fold_repeated_svalue): New decl.
        (region_model_manager::maybe_fold_bits_within_svalue): New decl.
        (region_model_manager::repeated_values_map_t): New typedef.
        (region_model_manager::m_repeated_values_map): New field.
        (region_model_manager::bits_within_values_map_t): New typedef.
        (region_model_manager::m_bits_within_values_map): New field.
        (region_model_manager::m_sized_regions): New field.
        (region_model::fill_region): New decl.
        * region.cc (region::get_base_region): Handle RK_SIZED.
        (region::base_region_p): Likewise.
        (region::get_byte_size_sval): New.
        (get_field_at_bit_offset): Make non-static.
        (region::calc_offset): Move implementation of cases to
        get_relative_concrete_offset vfunc implementations.  Handle
        RK_SIZED.
        (region::get_relative_concrete_offset): New.
        (decl_region::get_svalue_for_initializer): Drop enum binding_kind.
        (field_region::get_relative_concrete_offset): New, from
        region::calc_offset.
        (element_region::get_relative_concrete_offset): Likewise.
        (offset_region::get_relative_concrete_offset): Likewise.
        (sized_region::accept): New.
        (sized_region::dump_to_pp): New.
        (sized_region::get_byte_size): New.
        (sized_region::get_bit_size): New.
        * region.h (enum region_kind): Add RK_SIZED.
        (region::dyn_cast_sized_region): New.
        (region::get_byte_size): Make virtual.
        (region::get_bit_size): Likewise.
        (region::get_byte_size_sval): New decl.
        (region::get_relative_concrete_offset): New decl.
        (field_region::get_relative_concrete_offset): New decl.
        (element_region::get_relative_concrete_offset): Likewise.
        (offset_region::get_relative_concrete_offset): Likewise.
        (class sized_region): New.
        * store.cc (binding_kind_to_string): Delete.
        (binding_key::make): Drop enum binding_kind.
        (binding_key::dump_to_pp): Delete.
        (binding_key::cmp_ptrs): Drop enum binding_kind.
        (bit_range::contains_p): New.
        (byte_range::dump): New.
        (byte_range::contains_p): New.
        (byte_range::cmp): New.
        (concrete_binding::dump_to_pp): Drop enum binding_kind.
        (concrete_binding::cmp_ptr_ptr): Likewise.
        (symbolic_binding::dump_to_pp): Likewise.
        (symbolic_binding::cmp_ptr_ptr): Likewise.
        (binding_map::apply_ctor_val_to_range): Likewise.
        (binding_map::apply_ctor_pair_to_child_region): Likewise.
        (binding_map::get_overlapping_bindings): New.
        (binding_map::remove_overlapping_bindings): New.
        (binding_cluster::validate): New.
        (binding_cluster::bind): Drop enum binding_kind.
        (binding_cluster::bind_compound_sval): Likewise.
        (binding_cluster::purge_region): Likewise.
        (binding_cluster::zero_fill_region): Reimplement in terms of...
        (binding_cluster::fill_region): New.
        (binding_cluster::mark_region_as_unknown): Drop enum binding_kind.
        (binding_cluster::get_binding): Likewise.
        (binding_cluster::get_binding_recursive): Likewise.
        (binding_cluster::get_any_binding): Likewise.
        (binding_cluster::maybe_get_compound_binding): Reimplement.
        (binding_cluster::get_overlapping_bindings): Delete.
        (binding_cluster::remove_overlapping_bindings): Reimplement in
        terms of binding_map::remove_overlapping_bindings.
        (binding_cluster::can_merge_p): Update for removal of
        enum binding_kind.
        (binding_cluster::on_unknown_fncall): Drop enum binding_kind.
        (binding_cluster::maybe_get_simple_value): Likewise.
        (store_manager::get_concrete_binding): Likewise.
        (store_manager::get_symbolic_binding): Likewise.
        (store::validate): New.
        (store::set_value): Drop enum binding_kind.
        (store::zero_fill_region): Reimplement in terms of...
        (store::fill_region): New.
        (selftest::test_binding_key_overlap): Drop enum binding_kind.
        * store.h (enum binding_kind): Delete.
        (binding_kind_to_string): Delete decl.
        (binding_key::make): Drop enum binding_kind.
        (binding_key::dump_to_pp): Make pure virtual.
        (binding_key::get_kind): Delete.
        (binding_key::mark_deleted): Delete.
        (binding_key::mark_empty): Delete.
        (binding_key::is_deleted): Delete.
        (binding_key::is_empty): Delete.
        (binding_key::binding_key): Delete.
        (binding_key::impl_hash): Delete.
        (binding_key::impl_eq): Delete.
        (binding_key::m_kind): Delete.
        (bit_range::get_last_bit_offset): New.
        (bit_range::contains_p): New.
        (byte_range::contains_p): New.
        (byte_range::operator==): New.
        (byte_range::get_start_byte_offset): New.
        (byte_range::get_next_byte_offset): New.
        (byte_range::get_last_byte_offset): New.
        (byte_range::as_bit_range): New.
        (byte_range::cmp): New.
        (concrete_binding::concrete_binding): Drop enum binding_kind.
        (concrete_binding::hash): Likewise.
        (concrete_binding::operator==): Likewise.
        (concrete_binding::mark_deleted): New.
        (concrete_binding::mark_empty): New.
        (concrete_binding::is_deleted): New.
        (concrete_binding::is_empty): New.
        (default_hash_traits<ana::concrete_binding>::empty_zero_p): Make false.
        (symbolic_binding::symbolic_binding): Drop enum binding_kind.
        (symbolic_binding::hash): Likewise.
        (symbolic_binding::operator==): Likewise.
        (symbolic_binding::mark_deleted): New.
        (symbolic_binding::mark_empty): New.
        (symbolic_binding::is_deleted): New.
        (symbolic_binding::is_empty): New.
        (binding_map::remove_overlapping_bindings): New decl.
        (binding_map::get_overlapping_bindings): New decl.
        (binding_cluster::validate): New decl.
        (binding_cluster::bind): Drop enum binding_kind.
        (binding_cluster::fill_region): New decl.
        (binding_cluster::get_binding): Drop enum binding_kind.
        (binding_cluster::get_binding_recursive): Likewise.
        (binding_cluster::get_overlapping_bindings): Delete.
        (store::validate): New decl.
        (store::set_value): Drop enum binding_kind.
        (store::fill_region): New decl.
        (store_manager::get_concrete_binding): Drop enum binding_kind.
        (store_manager::get_symbolic_binding): Likewise.
        * svalue.cc (svalue::cmp_ptr): Handle SK_REPEATED and
        SK_BITS_WITHIN.
        (svalue::extract_bit_range): New.
        (svalue::maybe_fold_bits_within): New.
        (constant_svalue::maybe_fold_bits_within): New.
        (unknown_svalue::maybe_fold_bits_within): New.
        (unaryop_svalue::maybe_fold_bits_within): New.
        (repeated_svalue::repeated_svalue): New.
        (repeated_svalue::dump_to_pp): New.
        (repeated_svalue::accept): New.
        (repeated_svalue::all_zeroes_p): New.
        (repeated_svalue::maybe_fold_bits_within): New.
        (bits_within_svalue::bits_within_svalue): New.
        (bits_within_svalue::dump_to_pp): New.
        (bits_within_svalue::maybe_fold_bits_within): New.
        (bits_within_svalue::accept): New.
        (bits_within_svalue::implicitly_live_p): New.
        (compound_svalue::maybe_fold_bits_within): New.
        * svalue.h (enum svalue_kind): Add SK_REPEATED and SK_BITS_WITHIN.
        (svalue::dyn_cast_repeated_svalue): New.
        (svalue::dyn_cast_bits_within_svalue): New.
        (svalue::extract_bit_range): New decl.
        (svalue::maybe_fold_bits_within): New vfunc decl.
        (region_svalue::key_t::mark_empty): Use 2 rather than NULL_TREE.
        (region_svalue::key_t::is_empty): Likewise.
        (default_hash_traits<region_svalue::key_t>::empty_zero_p): Make false.
        (constant_svalue::maybe_fold_bits_within): New.
        (unknown_svalue::maybe_fold_bits_within): New.
        (poisoned_svalue::key_t::mark_empty): Use 2 rather than NULL_TREE.
        (poisoned_svalue::key_t::is_empty): Likewise.
        (default_hash_traits<poisoned_svalue::key_t>::empty_zero_p): Make
        false.
        (setjmp_svalue::key_t::mark_empty): Use 2 rather than NULL_TREE.
        (setjmp_svalue::key_t::is_empty): Likewise.
        (default_hash_traits<setjmp_svalue::key_t>::empty_zero_p): Make
        false.
        (unaryop_svalue::key_t::mark_empty): Use 2 rather than NULL_TREE.
        (unaryop_svalue::key_t::is_empty): Likewise.
        (unaryop_svalue::maybe_fold_bits_within): New.
        (default_hash_traits<unaryop_svalue::key_t>::empty_zero_p): Make
        false.
        (binop_svalue::key_t::mark_empty): Use 2 rather than NULL_TREE.
        (binop_svalue::key_t::is_empty): Likewise.
        (default_hash_traits<binop_svalue::key_t>::empty_zero_p): Make
        false.
        (sub_svalue::key_t::mark_empty): Use 2 rather than NULL_TREE.
        (sub_svalue::key_t::is_empty): Likewise.
        (default_hash_traits<sub_svalue::key_t>::empty_zero_p): Make
        false.
        (class repeated_svalue): New.
        (is_a_helper <const repeated_svalue *>::test): New.
        (struct default_hash_traits<repeated_svalue::key_t>): New.
        (class bits_within_svalue): New.
        (is_a_helper <const bits_within_svalue *>::test): New.
        (struct default_hash_traits<bits_within_svalue::key_t>): New.
        (widening_svalue::key_t::mark_empty): Use 2 rather than NULL_TREE.
        (widening_svalue::key_t::is_empty): Likewise.
        (default_hash_traits<widening_svalue::key_t>::empty_zero_p): Make
        false.
        (compound_svalue::key_t::mark_empty): Use 2 rather than NULL_TREE.
        (compound_svalue::key_t::is_empty): Likewise.
        (compound_svalue::maybe_fold_bits_within): New.
        (default_hash_traits<compound_svalue::key_t>::empty_zero_p): Make
        false.

2021-06-28  David Malcolm  <dmalcolm@redhat.com>

        * analyzer.h (byte_offset_t): New typedef.
        * store.cc (bit_range::dump_to_pp): Dump as a byte range if
        possible.
        (bit_range::as_byte_range): New.
        (byte_range::dump_to_pp): New.
        * store.h (class byte_range): New forward decl.
        (struct bit_range): Add comment.
        (bit_range::as_byte_range): New decl.
        (struct byte_range): New.

2021-06-22  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/101143
        * region-model.cc (compat_types_p): New function.
        (region_model::create_region_for_heap_alloc): Convert assertion to
        an error check.
        (region_model::create_region_for_alloca): Likewise.

2021-06-18  David Malcolm  <dmalcolm@redhat.com>

        * store.cc (binding_cluster::get_any_binding): Make symbolic reads
        from a cluster with concrete bindings return unknown.

2021-06-18  David Malcolm  <dmalcolm@redhat.com>

        * region-model-manager.cc
        (region_model_manager::get_or_create_int_cst): New.
        (region_model_manager::maybe_undo_optimize_bit_field_compare): Use
        it to simplify away a local tree.
        * region-model.cc (region_model::on_setjmp): Likewise.
        (region_model::on_longjmp): Likewise.
        * region-model.h (region_model_manager::get_or_create_int_cst):
        New decl.
        * store.cc (binding_cluster::zero_fill_region): Use it to simplify
        away a local tree.

2021-06-18  David Malcolm  <dmalcolm@redhat.com>

        * checker-path.cc (class custom_event): Make abstract to allow for
        custom vfuncs, splitting existing implementation into...
        (class precanned_custom_event): New subclass.
        (custom_event::get_desc): Move to...
        (precanned_custom_event::get_desc): ...subclass.
        * checker-path.h (class custom_event): Make abstract to allow for
        custom vfuncs, splitting existing implementation into...
        (class precanned_custom_event): New subclass.
        * diagnostic-manager.cc (diagnostic_manager::add_events_for_eedge):
        Use precanned_custom_event.
        * engine.cc
        (stale_jmp_buf::maybe_add_custom_events_for_superedge): Likewise.
        * sm-signal.cc (signal_delivery_edge_info_t::add_events_to_path):
        Likewise.

2021-06-15  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/99212
        PR analyzer/101082
        * engine.cc: Include "target.h".
        (impl_run_checkers): Log BITS_BIG_ENDIAN, BYTES_BIG_ENDIAN, and
        WORDS_BIG_ENDIAN.
        * region-model-manager.cc
        (region_model_manager::maybe_fold_binop): Move support for masking
        via ARG0 & CST into...
        (region_model_manager::maybe_undo_optimize_bit_field_compare):
        ...this new function.  Flatten by converting from nested
        conditionals to a series of early return statements to reject
        failures.  Reject if type is not unsigned_char_type_node.
        Handle BYTES_BIG_ENDIAN when determining which bits are bound
        in the binding_map.
        * region-model.h
        (region_model_manager::maybe_undo_optimize_bit_field_compare):
        New decl.
        * store.cc (bit_range::dump): New function.
        * store.h (bit_range::dump): New decl.

2021-06-15  David Malcolm  <dmalcolm@redhat.com>

        * engine.cc (exploded_node::on_stmt): Handle __analyzer_dump_capacity.
        (exploded_node::on_stmt): Drop m_sm_changes from on_stmt_flags.
        (state_change_requires_new_enode_p): New function...
        (exploded_graph::process_node): Call it, rather than querying
        flags.m_sm_changes, so that dynamic-extent differences can also
        trigger the splitting of nodes.
        * exploded-graph.h (struct on_stmt_flags): Drop field m_sm_changes.
        * program-state.cc (program_state::detect_leaks): Purge dead
        heap-allocated regions from dynamic extents.
        (selftest::test_program_state_1): Fix type of "size_in_bytes".
        (selftest::test_program_state_merging): Likewise.
        * region-model-impl-calls.cc
        (region_model::impl_call_analyzer_dump_capacity): New.
        (region_model::impl_call_free): Remove dynamic extents from the
        freed region.
        * region-model-reachability.h
        (reachable_regions::begin_mutable_base_regs): New.
        (reachable_regions::end_mutable_base_regs): New.
        * region-model.cc: Include "tree-object-size.h".
        (region_model::region_model): Support new field m_dynamic_extents.
        (region_model::operator=): Likewise.
        (region_model::operator==): Likewise.
        (region_model::dump_to_pp): Dump sizes of dynamic regions.
        (region_model::handle_unrecognized_call): Purge dynamic extents
        from any regions that have escaped mutably:.
        (region_model::get_capacity): New function.
        (region_model::add_constraint): Unset dynamic extents when a
        heap-allocated region's address is NULL.
        (region_model::unbind_region_and_descendents): Purge dynamic
        extents of unbound regions.
        (region_model::can_merge_with_p): Call
        m_dynamic_extents.can_merge_with_p.
        (region_model::create_region_for_heap_alloc): Assert that
        size_in_bytes's type is compatible with size_type_node.  Update
        for renaming of record_dynamic_extents to set_dynamic_extents.
        (region_model::create_region_for_alloca): Likewise.
        (region_model::record_dynamic_extents): Rename to...
        (region_model::set_dynamic_extents): ...this.  Assert that
        size_in_bytes's type is compatible with size_type_node.  Add it
        to the m_dynamic_extents map.
        (region_model::get_dynamic_extents): New.
        (region_model::unset_dynamic_extents): New.
        (selftest::test_state_merging): Fix type of "size".
        (selftest::test_malloc_constraints): Likewise.
        (selftest::test_malloc): Verify dynamic extents.
        (selftest::test_alloca): Likewise.
        * region-model.h (region_to_value_map::is_empty): New.
        (region_model::dynamic_extents_t): New typedef.
        (region_model::impl_call_analyzer_dump_capacity): New decl.
        (region_model::get_dynamic_extents): New function.
        (region_model::get_dynamic_extents): New decl.
        (region_model::set_dynamic_extents): New decl.
        (region_model::unset_dynamic_extents): New decl.
        (region_model::get_capacity): New decl.
        (region_model::record_dynamic_extents): Rename to set_dynamic_extents.
        (region_model::m_dynamic_extents): New field.

2021-06-15  David Malcolm  <dmalcolm@redhat.com>

        * region-model.cc (region_to_value_map::operator=): New.
        (region_to_value_map::operator==): New.
        (region_to_value_map::dump_to_pp): New.
        (region_to_value_map::dump): New.
        (region_to_value_map::can_merge_with_p): New.
        * region-model.h (class region_to_value_map): New class.

2021-06-13  Trevor Saunders  <tbsaunde@tbsaunde.org>

        * call-string.cc (call_string::call_string): Use range based for
        to iterate over vec<>.
        (call_string::to_json): Likewise.
        (call_string::hash): Likewise.
        (call_string::calc_recursion_depth): Likewise.
        * checker-path.cc (checker_path::fixup_locations): Likewise.
        * constraint-manager.cc (equiv_class::equiv_class): Likewise.
        (equiv_class::to_json): Likewise.
        (equiv_class::hash): Likewise.
        (constraint_manager::to_json): Likewise.
        * engine.cc (impl_region_model_context::on_svalue_leak):
        Likewise.
        (on_liveness_change): Likewise.
        (impl_region_model_context::on_unknown_change): Likewise.
        * program-state.cc (sm_state_map::set_state): Likewise.
        * region-model.cc (test_canonicalization_4): Likewise.

2021-06-11  David Malcolm  <dmalcolm@redhat.com>

        * engine.cc (worklist::key_t::cmp): Move sort by call_string to
        before SCC.

2021-06-09  David Malcolm  <dmalcolm@redhat.com>

        * region-model.cc (region_model::get_lvalue_1): Make const.
        (region_model::get_lvalue): Likewise.
        (region_model::get_rvalue_1): Likewise.
        (region_model::get_rvalue): Likewise.
        (region_model::deref_rvalue): Likewise.
        (region_model::get_rvalue_for_bits): Likewise.
        * region-model.h (region_model::get_lvalue): Likewise.
        (region_model::get_rvalue): Likewise.
        (region_model::deref_rvalue): Likewise.
        (region_model::get_rvalue_for_bits): Likewise.
        (region_model::get_lvalue_1): Likewise.
        (region_model::get_rvalue_1): Likewise.

2021-06-08  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/99212
        * region-model-manager.cc
        (region_model_manager::maybe_fold_binop): Add support for folding
        BIT_AND_EXPR of compound_svalue and a mask constant.
        * region-model.cc (region_model::get_rvalue_1): Implement
        BIT_FIELD_REF in terms of...
        (region_model::get_rvalue_for_bits): New function.
        * region-model.h (region_model::get_rvalue_for_bits): New decl.
        * store.cc (bit_range::from_mask): New function.
        (selftest::test_bit_range_intersects_p): New selftest.
        (selftest::assert_bit_range_from_mask_eq): New.
        (ASSERT_BIT_RANGE_FROM_MASK_EQ): New macro.
        (selftest::assert_no_bit_range_from_mask_eq): New.
        (ASSERT_NO_BIT_RANGE_FROM_MASK): New macro.
        (selftest::test_bit_range_from_mask): New selftest.
        (selftest::analyzer_store_cc_tests): Call the new selftests.
        * store.h (bit_range::intersects_p): New.
        (bit_range::from_mask): New decl.
        (concrete_binding::get_bit_range): New accessor.
        (store_manager::get_concrete_binding): New overload taking
        const bit_range &.

2021-06-08  David Malcolm  <dmalcolm@redhat.com>

        * analyzer.h (int_size_in_bits): New decl.
        * region.cc (int_size_in_bits): New function.
        (region::get_bit_size): Reimplement in terms of the above.

2021-06-08  David Malcolm  <dmalcolm@redhat.com>

        * store.cc (concrete_binding::dump_to_pp): Move bulk of
        implementation to...
        (bit_range::dump_to_pp): ...this new function.
        (bit_range::cmp): New.
        (concrete_binding::overlaps_p): Update for use of bit_range.
        (concrete_binding::cmp_ptr_ptr): Likewise.
        * store.h (struct bit_range): New.
        (class concrete_binding): Replace fields m_start_bit_offset and
        m_size_in_bits with new field m_bit_range.

2021-06-08  David Malcolm  <dmalcolm@redhat.com>

        * svalue.h (conjured_svalue::iterator_t): Delete.

2021-06-03  David Malcolm  <dmalcolm@redhat.com>

        * store.h (store::get_direct_binding): Remove unused decl.
        (store::get_default_binding): Likewise.

2021-06-03  David Malcolm  <dmalcolm@redhat.com>

        * svalue.cc (poisoned_svalue::dump_to_pp): Dump type.
        (compound_svalue::dump_to_pp): Dump any type.

2021-05-18  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/100615
        * sm-malloc.cc: Include "analyzer/function-set.h".
        (malloc_state_machine::on_stmt): Call unaffected_by_call_p and
        bail on the functions it recognizes.
        (malloc_state_machine::unaffected_by_call_p): New.

2021-05-10  Martin Liska  <mliska@suse.cz>

        * sm-file.cc (is_file_using_fn_p): Use startswith
        function instead of strncmp.

2021-05-10  Martin Liska  <mliska@suse.cz>

        * program-state.cc (program_state::operator=): Remove
        __cplusplus >= 201103.
        (program_state::program_state): Likewise.
        * program-state.h: Likewise.
        * region-model.h (class region_model): Remove dead code.

2021-04-24  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/100244
        * sm-malloc.cc (free_of_non_heap::describe_state_change):
        Bulletproof against change.m_expr being NULL.

2021-04-13  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/98599
        * supergraph.cc (saved_uids::make_uid_unique): New.
        (saved_uids::restore_uids): New.
        (supergraph::supergraph): Replace assignments to stmt->uid with
        calls to m_stmt_uids.make_uid_unique.
        (supergraph::~supergraph): New.
        * supergraph.h (class saved_uids): New.
        (supergraph::~supergraph): New decl.
        (supergraph::m_stmt_uids): New field.

2021-04-10  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/100011
        * region-model.cc (region_model::on_assignment): Avoid NULL
        dereference if ctxt is NULL when assigning from a STRING_CST.

2021-04-08  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/99042
        PR analyzer/99774
        * engine.cc
        (impl_region_model_context::impl_region_model_context): Add
        uncertainty param and use it to initialize m_uncertainty.
        (impl_region_model_context::get_uncertainty): New.
        (impl_sm_context::get_fndecl_for_call): Add NULL for new
        uncertainty param when constructing impl_region_model_context.
        (impl_sm_context::get_state): Likewise.
        (impl_sm_context::set_next_state): Likewise.
        (impl_sm_context::warn): Likewise.
        (exploded_node::on_stmt): Add uncertainty param
        and use it when constructing impl_region_model_context.
        (exploded_node::on_edge): Add uncertainty param and pass
        to on_edge call.
        (exploded_node::detect_leaks): Create uncertainty_t and pass to
        impl_region_model_context.
        (exploded_graph::get_or_create_node): Create uncertainty_t and
        pass to prune_for_point.
        (maybe_process_run_of_before_supernode_enodes): Create
        uncertainty_t and pass to impl_region_model_context.
        (exploded_graph::process_node): Create uncertainty_t instances and
        pass around as needed.
        * exploded-graph.h
        (impl_region_model_context::impl_region_model_context): Add
        uncertainty param.
        (impl_region_model_context::get_uncertainty): New decl.
        (impl_region_model_context::m_uncertainty): New field.
        (exploded_node::on_stmt): Add uncertainty param.
        (exploded_node::on_edge): Likewise.
        * program-state.cc (sm_state_map::on_liveness_change): Get
        uncertainty from context and use it to unset sm-state from
        svalues as appropriate.
        (program_state::on_edge): Add uncertainty param and use it when
        constructing impl_region_model_context.  Fix indentation.
        (program_state::prune_for_point): Add uncertainty param and use it
        when constructing impl_region_model_context.
        (program_state::detect_leaks): Get any uncertainty from ctxt and
        use it to get maybe-live svalues for dest_state, rather than
        definitely-live ones; use this when determining which svalues
        have leaked.
        (selftest::test_program_state_merging): Create uncertainty_t and
        pass to impl_region_model_context.
        * program-state.h (program_state::on_edge): Add uncertainty param.
        (program_state::prune_for_point): Likewise.
        * region-model-impl-calls.cc (call_details::get_uncertainty): New.
        (region_model::impl_call_memcpy): Pass uncertainty to
        mark_region_as_unknown call.
        (region_model::impl_call_memset): Likewise.
        (region_model::impl_call_strcpy): Likewise.
        * region-model-reachability.cc (reachable_regions::handle_sval):
        Also add sval to m_mutable_svals.
        * region-model.cc (region_model::on_assignment): Pass any
        uncertainty from ctxt to the store::set_value call.
        (region_model::handle_unrecognized_call): Get any uncertainty from
        ctxt and use it to record mutable svalues at the unknown call.
        (region_model::get_reachable_svalues): Add uncertainty param and
        use it to mark any maybe-bound svalues as being reachable.
        (region_model::set_value): Pass any uncertainty from ctxt to the
        store::set_value call.
        (region_model::mark_region_as_unknown): Add uncertainty param and
        pass it on to the store::mark_region_as_unknown call.
        (region_model::update_for_call_summary): Add uncertainty param and
        pass it on to the region_model::mark_region_as_unknown call.
        * region-model.h (call_details::get_uncertainty): New decl.
        (region_model::get_reachable_svalues): Add uncertainty param.
        (region_model::mark_region_as_unknown): Add uncertainty param.
        (region_model_context::get_uncertainty): New vfunc.
        (noop_region_model_context::get_uncertainty): New vfunc
        implementation.
        * store.cc (dump_svalue_set): New.
        (uncertainty_t::dump_to_pp): New.
        (uncertainty_t::dump): New.
        (binding_cluster::clobber_region): Pass NULL for uncertainty to
        remove_overlapping_bindings.
        (binding_cluster::mark_region_as_unknown): Add uncertainty param
        and pass it to remove_overlapping_bindings.
        (binding_cluster::remove_overlapping_bindings): Add uncertainty param.
        Use it to record any svalues that were in clobbered bindings.
        (store::set_value): Add uncertainty param.  Pass it to
        binding_cluster::mark_region_as_unknown when handling symbolic
        regions.
        (store::mark_region_as_unknown): Add uncertainty param and pass it
        to binding_cluster::mark_region_as_unknown.
        (store::remove_overlapping_bindings): Add uncertainty param and
        pass it to binding_cluster::remove_overlapping_bindings.
        * store.h (binding_cluster::mark_region_as_unknown): Add
        uncertainty param.
        (binding_cluster::remove_overlapping_bindings): Likewise.
        (store::set_value): Likewise.
        (store::mark_region_as_unknown): Likewise.

2021-04-05  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/99906
        * analyzer.cc (maybe_reconstruct_from_def_stmt): Fix NULL
        dereference on calls with zero arguments.
        * sm-malloc.cc (malloc_state_machine::on_stmt): When handling
        __attribute__((nonnull)), only call get_diagnostic_tree if the
        result will be used.

2021-04-05  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/99886
        * diagnostic-manager.cc
        (diagnostic_manager::prune_interproc_events): Use signed integers
        when subtracting one from path->num_events ().
        (diagnostic_manager::consolidate_conditions): Likewise.  Convert
        next_idx to a signed int.

2021-04-01  David Malcolm  <dmalcolm@redhat.com>

        * diagnostic-manager.cc (diagnostic_manager::add_diagnostic): Make
        enode param non-constant, and call add_diagnostic on it.  Add
        enode index to log message.
        (diagnostic_manager::add_diagnostic): Make enode param
        non-constant.
        * diagnostic-manager.h (diagnostic_manager::add_diagnostic):
        Likewise for both decls.
        * engine.cc
        (impl_region_model_context::impl_region_model_context): Likewise
        for enode_for_diag.
        (impl_sm_context::impl_sm_context): Likewise.
        (impl_sm_context::m_enode_for_diag): Likewise.
        (exploded_node::dump_dot): Don't pass the diagnostic manager
        to dump_saved_diagnostics.
        (exploded_node::dump_saved_diagnostics): Drop param.  Iterate
        directly through all saved diagnostics for the enode, rather
        than all saved diagnostics in the diagnostic_manager and
        filtering.
        (exploded_node::on_stmt): Make non-const.
        (exploded_node::on_edge): Likewise.
        (exploded_node::on_longjmp): Likewise.
        (exploded_node::detect_leaks): Likewise.
        (exploded_graph::get_or_create_node): Make enode_for_diag param
        non-const.
        (exploded_graph_annotator::print_enode): Iterate
        directly through all saved diagnostics for the enode, rather
        than all saved diagnostics in the diagnostic_manager and
        filtering.
        * exploded-graph.h
        (impl_region_model_context::impl_region_model_context): Make
        enode_for_diag param non-constant.
        (impl_region_model_context::m_enode_for_diag): Likewise.
        (exploded_node::dump_saved_diagnostics): Drop param.
        (exploded_node::on_stmt): Make non-const.
        (exploded_node::on_edge): Likewise.
        (exploded_node::on_longjmp): Likewise.
        (exploded_node::detect_leaks): Likewise.
        (exploded_node::add_diagnostic): New.
        (exploded_node::get_num_diagnostics): New.
        (exploded_node::get_saved_diagnostic): New.
        (exploded_node::m_saved_diagnostics): New.
        (exploded_graph::get_or_create_node): Make enode_for_diag param
        non-constant.
        * feasible-graph.cc (feasible_node::dump_dot): Drop
        diagnostic_manager from call to dump_saved_diagnostics.
        * program-state.cc (program_state::on_edge): Convert enode param
        to non-const pointer.
        (program_state::prune_for_point): Likewise for enode_for_diag
        param.
        * program-state.h (program_state::on_edge): Convert enode param
        to non-const pointer.
        (program_state::prune_for_point): Likewise for enode_for_diag
        param.

2021-03-31  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/99771
        * analyzer.cc (maybe_reconstruct_from_def_stmt): New.
        (fixup_tree_for_diagnostic_1): New.
        (fixup_tree_for_diagnostic): New.
        * analyzer.h (fixup_tree_for_diagnostic): New decl.
        * checker-path.cc (call_event::get_desc): Call
        fixup_tree_for_diagnostic and use it for the call_with_state call.
        (warning_event::get_desc): Likewise for the final_event and
        make_label_text calls.
        * engine.cc (impl_region_model_context::on_state_leak): Likewise
        for the on_leak and add_diagnostic calls.
        * region-model.cc (region_model::get_representative_tree):
        Likewise for the result.

2021-03-30  David Malcolm  <dmalcolm@redhat.com>

        * region.h (region::dump_to_pp): Remove old decl.

2021-03-30  David Malcolm  <dmalcolm@redhat.com>

        * sm-file.cc (fileptr_state_machine::on_stmt): Only call
        get_diagnostic_tree if the result will be used.
        * sm-malloc.cc (malloc_state_machine::on_stmt): Likewise.
        (malloc_state_machine::on_deallocator_call): Likewise.
        (malloc_state_machine::on_realloc_call): Likewise.
        (malloc_state_machine::on_realloc_call): Likewise.
        * sm-sensitive.cc
        (sensitive_state_machine::warn_for_any_exposure): Likewise.
        * sm-taint.cc (taint_state_machine::on_stmt): Likewise.

2021-03-25  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93695
        PR analyzer/99044
        PR analyzer/99716
        * engine.cc (exploded_node::on_stmt): Clear sm-state involving
        an SSA name at the def-stmt of that SSA name.
        * program-state.cc (sm_state_map::purge_state_involving): New.
        * program-state.h (sm_state_map::purge_state_involving): New decl.
        * region-model.cc (selftest::test_involves_p): New.
        (selftest::analyzer_region_model_cc_tests): Call it.
        * svalue.cc (class involvement_visitor): New class
        (svalue::involves_p): New.
        * svalue.h (svalue::involves_p): New decl.

2021-03-19  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/99614
        * diagnostic-manager.cc (class epath_finder): Add
        DISABLE_COPY_AND_ASSIGN.

2021-03-15  Martin Liska  <mliska@suse.cz>

        * sm-file.cc (get_file_using_fns): Add missing comma in initializer.

2021-03-11  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96374
        * analyzer.opt (-param=analyzer-max-infeasible-edges=): New param.
        (fdump-analyzer-feasibility): New flag.
        * diagnostic-manager.cc: Include "analyzer/trimmed-graph.h" and
        "analyzer/feasible-graph.h".
        (epath_finder::epath_finder): Convert m_sep to a pointer and
        only create it if !flag_analyzer_feasibility.
        (epath_finder::~epath_finder): New.
        (epath_finder::m_sep): Convert to a pointer.
        (epath_finder::get_best_epath): Add param "diag_idx" and use it
        when logging.  Rather than finding the shortest path and then
        checking feasibility, instead use explore_feasible_paths unless
        !flag_analyzer_feasibility, in which case simply use the shortest
        path, and note if it is infeasible.  Update for m_sep becoming a
        pointer.
        (class feasible_worklist): New.
        (epath_finder::explore_feasible_paths): New.
        (epath_finder::process_worklist_item): New.
        (class dump_eg_with_shortest_path): New.
        (epath_finder::dump_trimmed_graph): New.
        (epath_finder::dump_feasible_graph): New.
        (saved_diagnostic::saved_diagnostic): Add "idx" param, using it
        on new field m_idx.
        (saved_diagnostic::to_json): Dump m_idx.
        (saved_diagnostic::calc_best_epath): Pass m_idx to get_best_epath.
        Remove assertion that m_problem was set when m_best_epath is NULL.
        (diagnostic_manager::add_diagnostic): Pass an index when created
        saved_diagnostic instances.
        * diagnostic-manager.h (saved_diagnostic::saved_diagnostic): Add
        "idx" param.
        (saved_diagnostic::get_index): New accessor.
        (saved_diagnostic::m_idx): New field.
        * engine.cc (exploded_node::dump_dot): Call args.dump_extra_info.
        Move code to...
        (exploded_node::dump_processed_stmts): ...this new function and...
        (exploded_node::dump_saved_diagnostics): ...this new function.
        Add index of each diagnostic.
        (exploded_edge::dump_dot):  Move bulk of code to...
        (exploded_edge::dump_dot_label): ...this new function.
        * exploded-graph.h (eg_traits::dump_args_t::dump_extra_info): New
        vfunc.
        (exploded_node::dump_processed_stmts): New decl.
        (exploded_node::dump_saved_diagnostics): New decl.
        (exploded_edge::dump_dot_label): New decl.
        * feasible-graph.cc: New file.
        * feasible-graph.h: New file.
        * trimmed-graph.cc: New file.
        * trimmed-graph.h: New file.

2021-03-11  David Malcolm  <dmalcolm@redhat.com>

        * diagnostic-manager.cc (epath_finder::epath_finder):
        Update shortest_paths init for new param.

2021-03-10  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96374
        * engine.cc (exploded_path::feasible_p): Move "snodes_visited" and
        "model" locals into a new class feasibility_state.  Move heart
        of per-edge processing into
        feasibility_state::maybe_update_for_edge.
        (feasibility_state::feasibility_state): New.
        (feasibility_state::maybe_update_for_edge): New, based on loop
        body in exploded_path::feasible_p.
        * exploded-graph.h (class feasibility_state): New.

2021-03-10  David Malcolm  <dmalcolm@redhat.com>

        * supergraph.h
        (callgraph_superedge::dyn_cast_callgraph_superedge): New.
        (call_superedge::dyn_cast_callgraph_superedge): Delete.
        (return_superedge::dyn_cast_callgraph_superedge): Delete.

2021-03-02  Martin Liska  <mliska@suse.cz>

        * diagnostic-manager.cc (diagnostic_manager::emit_saved_diagnostics):
        Do not pass engine.

2021-02-26  David Malcolm  <dmalcolm@redhat.com>

        * engine.cc (exploded_path::exploded_path): New copy-ctor.
        * exploded-graph.h (exploded_path::operator=): Drop decl.

2021-02-26  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96374
        * diagnostic-manager.cc (class epath_finder): New.
        (epath_finder::get_best_epath): New.
        (saved_diagnostic::saved_diagnostic): Update for replacement of
        m_state and m_epath_length with m_best_epath.
        (saved_diagnostic::~saved_diagnostic): Delete m_best_epath.
        (saved_diagnostic::to_json): Update "path_length" to be optional.
        (saved_diagnostic::calc_best_epath): New, based on
        dedupe_winners::add and parts of dedupe_key::dedupe_key.
        (saved_diagnostic::get_epath_length): New.
        (saved_diagnostic::add_duplicate): New.
        (dedupe_key::dedupe_key): Drop epath param.  Move invocation of
        stmt_finder to saved_diagnostic::calc_best_epath.
        (class dedupe_candidate): Delete.
        (class dedupe_hash_map_traits): Update to use saved_diagnotic *
        rather than dedupe_candidate * as the value_type/compare_type.
        (dedupe_winners::~dedupe_winners): Don't delete the values.
        (dedupe_winners::add): Convert param from shortest_exploded_paths to
        epath_finder.  Drop "eg" param.  Drop dedupe_candidate, moving
        path generation and feasiblity checking to
        epath_finder::get_best_epath.  Update winner-selection for move
        of epaths from dedupe_candidate to saved_diagnostic.
        (dedupe_winners::emit_best):  Update for removal of class
        dedupe_candidate.
        (dedupe_winners::map_t): Update to use saved_diagnotic * rather
        than dedupe_candidate * as the value_type/compare_type.
        (diagnostic_manager::emit_saved_diagnostics): Move
        shortest_exploded_paths instance into epath_finder and pass that
        around instead.
        (diagnostic_manager::emit_saved_diagnostic): Drop epath, stmt
        and num_dupes params, instead getting these from the
        saved_diagnostic.  Use correct location in inform_n call.
        * diagnostic-manager.h (class epath_finder): New forward decl.
        (saved_diagnostic::status): Drop enum.
        (saved_diagnostic::set_feasible): Drop.
        (saved_diagnostic::set_infeasible): Drop.
        (saved_diagnostic::get_status): Drop.
        (saved_diagnostic::calc_best_epath): New decl.
        (saved_diagnostic::get_best_epath): New decl.
        (saved_diagnostic::get_epath_length): New decl.
        (saved_diagnostic::set_epath_length): Drop.
        (saved_diagnostic::get_epath_length): Drop inline implementation.
        (saved_diagnostic::add_duplicate): New.
        (saved_diagnostic::get_num_dupes): New.
        (saved_diagnostic::m_d): Document ownership.
        (saved_diagnostic::m_trailing_eedge): Make const.
        (saved_diagnostic::m_status): Drop field.
        (saved_diagnostic::m_epath_length): Drop field.
        (saved_diagnostic::m_best_epath): New field.
        (saved_diagnostic::m_problem): Document ownership.
        (saved_diagnostic::m_duplicates): New field.
        (diagnostic_manager::emit_saved_diagnostic): Drop params epath,
        stmt, and num_dupes.
        * engine.cc (exploded_graph_annotator::print_saved_diagnostic):
        Update for changes to saved_diagnostic class.
        * exploded-graph.h (exploded_path::feasible_p): Drop unused
        overloaded decl.

2021-02-25  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/99193
        * region-model-impl-calls.cc (region_model::impl_call_realloc): New.
        * region-model.cc (region_model::on_call_pre): Call it.
        * region-model.h (region_model::impl_call_realloc): New decl.
        * sm-malloc.cc (enum wording): Add WORDING_REALLOCATED.
        (malloc_state_machine::m_realloc): New field.
        (use_after_free::describe_state_change): Add case for
        WORDING_REALLOCATED.
        (use_after_free::describe_final_event): Likewise.
        (malloc_state_machine::malloc_state_machine): Initialize
        m_realloc.
        (malloc_state_machine::on_stmt): Handle realloc by calling...
        (malloc_state_machine::on_realloc_call): New.

2021-02-22  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/99196
        * engine.cc (exploded_node::on_stmt): Provide terminate_path
        flag as a way for on_call_pre to terminate the current analysis
        path.
        * region-model-impl-calls.cc (call_details::num_args): New.
        (region_model::impl_call_error): New.
        * region-model.cc (region_model::on_call_pre): Add param
        "out_terminate_path".  Handle "error" and "error_at_line".
        * region-model.h (call_details::num_args): New decl.
        (region_model::on_call_pre): Add param "out_terminate_path".
        (region_model::impl_call_error): New decl.

2021-02-17  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/98969
        * constraint-manager.cc (dead_svalue_purger::should_purge_p):
        Update for change to svalue::live_p.
        * program-state.cc (sm_state_map::on_liveness_change): Likewise.
        (program_state::detect_leaks): Likewise.
        * region-model-reachability.cc (reachable_regions::init_cluster):
        When dealing with a symbolic region, if the underlying pointer is
        implicitly live, add the region to the reachable regions.
        * region-model.cc (region_model::compare_initial_and_pointer):
        Move logic for detecting initial values of params to
        initial_svalue::initial_value_of_param_p.
        * svalue.cc (svalue::live_p): Convert "live_svalues" from a
        reference to a pointer; support it being NULL.
        (svalue::implicitly_live_p): Convert first param from a
        refererence to a pointer.
        (region_svalue::implicitly_live_p): Likewise.
        (constant_svalue::implicitly_live_p): Likewise.
        (initial_svalue::implicitly_live_p): Likewise.  Treat the initial
        values of params for the top level frame as still live.
        (initial_svalue::initial_value_of_param_p): New function, taken
        from a test in region_model::compare_initial_and_pointer.
        (unaryop_svalue::implicitly_live_p): Convert first param from a
        refererence to a pointer.
        (binop_svalue::implicitly_live_p): Likewise.
        (sub_svalue::implicitly_live_p): Likewise.
        (unmergeable_svalue::implicitly_live_p): Likewise.
        * svalue.h (svalue::live_p): Likewise.
        (svalue::implicitly_live_p): Likewise.
        (region_svalue::implicitly_live_p): Likewise.
        (constant_svalue::implicitly_live_p): Likewise.
        (initial_svalue::implicitly_live_p): Likewise.
        (initial_svalue::initial_value_of_param_p): New decl.
        (unaryop_svalue::implicitly_live_p): Convert first param from a
        refererence to a pointer.
        (binop_svalue::implicitly_live_p): Likewise.
        (sub_svalue::implicitly_live_p): Likewise.
        (unmergeable_svalue::implicitly_live_p): Likewise.

2021-02-12  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/98969
        * engine.cc (readability): Add names for the various arbitrary
        values.  Handle NOP_EXPR and INTEGER_CST.
        (readability_comparator): Combine the readability tests for
        tree and stack depth, rather than performing them sequentially.
        (impl_region_model_context::on_state_leak): Strip off top-level
        casts.
        * region-model.cc (region_model::get_representative_path_var): Add
        type-checking, moving the bulk of the implementation to...
        (region_model::get_representative_path_var_1): ...here.  Respect
        types in casts by recursing and re-adding the cast, rather than
        merely stripping them off.  Use the correct type when handling
        region_svalue.
        (region_model::get_representative_tree): Strip off any top-level
        cast.
        (region_model::get_representative_path_var): Add type-checking,
        moving the bulk of the implementation to...
        (region_model::get_representative_path_var_1): ...here.
        * region-model.h (region_model::get_representative_path_var_1):
        New decl
        (region_model::get_representative_path_var_1): New decl.
        * store.cc (append_pathvar_with_type): New.
        (binding_cluster::get_representative_path_vars): Cast path_vars
        to the correct type when adding them to *OUT_PVS.

2021-02-09  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/98575
        * sm-file.cc (is_file_using_fn_p): Support "_IO_"-prefixed
        variants.

2021-02-09  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/98575
        * store.cc (store::set_value): Treat a pointer written to *UNKNOWN
        as having escaped.

2021-02-02  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93355
        PR analyzer/96374
        * engine.cc (toplevel_function_p): Simplify so that
        we only reject functions with a "__analyzer_" prefix.
        (add_any_callbacks): Delete.
        (exploded_graph::build_initial_worklist): Update for
        dropped param of toplevel_function_p.
        (exploded_graph::build_initial_worklist): Don't bother
        looking for callbacks that are reachable from global
        initializers.

2021-02-01  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/98918
        * region-model-manager.cc
        (region_model_manager::get_or_create_initial_value):
        Fold the initial value of *UNKNOWN_PTR to an UNKNOWN value.
        (region_model_manager::get_field_region): Fold the value
        of UNKNOWN_PTR->FIELD to *UNKNOWN_PTR_OF_&FIELD_TYPE.

2021-01-29  David Malcolm  <dmalcolm@redhat.com>

        * checker-path.cc (event_kind_to_string): Handle
        EK_START_CONSOLIDATED_CFG_EDGES and
        EK_END_CONSOLIDATED_CFG_EDGES.
        (start_consolidated_cfg_edges_event::get_desc): New.
        (checker_path::cfg_edge_pair_at_p): New.
        * checker-path.h (enum event_kind): Add
        EK_START_CONSOLIDATED_CFG_EDGES and
        EK_END_CONSOLIDATED_CFG_EDGES.
        (class start_consolidated_cfg_edges_event): New class.
        (class end_consolidated_cfg_edges_event): New class.
        (checker_path::delete_events): New.
        (checker_path::replace_event): New.
        (checker_path::cfg_edge_pair_at_p): New decl.
        * diagnostic-manager.cc (diagnostic_manager::prune_path): Call
        consolidate_conditions.
        (same_line_as_p): New.
        (diagnostic_manager::consolidate_conditions): New.
        * diagnostic-manager.h
        (diagnostic_manager::consolidate_conditions): New decl.

2021-01-18  David Malcolm  <dmalcolm@redhat.com>

        * analyzer.h (is_std_named_call_p): New decl.
        * diagnostic-manager.cc (path_builder::get_sm): New.
        (state_change_event_creator::state_change_event_creator): Add "pb"
        param.
        (state_change_event_creator::on_global_state_change): Don't consider
        state changes affecting other state_machines.
        (state_change_event_creator::on_state_change): Likewise.
        (state_change_event_creator::m_pb): New field.
        (diagnostic_manager::add_events_for_eedge): Pass pb to visitor
        ctor.
        * region-model-impl-calls.cc
        (region_model::impl_deallocation_call): New.
        * region-model.cc: Include "attribs.h".
        (region_model::on_call_post): Handle fndecls referenced by
        __attribute__((deallocated_by(FOO))).
        * region-model.h (region_model::impl_deallocation_call): New decl.
        * sm-malloc.cc: Include "stringpool.h" and "attribs.h".  Add
        leading comment.
        (class api): Delete.
        (enum resource_state): Update comment for change from api to
        deallocator and deallocator_set.
        (allocation_state::allocation_state): Drop api param.  Add
        "deallocators" and "deallocator".
        (allocation_state::m_api): Drop field in favor of...
        (allocation_state::m_deallocators): New field.
        (allocation_state::m_deallocator): New field.
        (enum wording): Add WORDING_DEALLOCATED.
        (struct deallocator): New.
        (struct standard_deallocator): New.
        (struct custom_deallocator): New.
        (struct deallocator_set): New.
        (struct custom_deallocator_set): New.
        (struct standard_deallocator_set): New.
        (struct deallocator_set_map_traits): New.
        (malloc_state_machine::m_malloc): Drop field
        (malloc_state_machine::m_scalar_new): Likewise.
        (malloc_state_machine::m_vector_new): Likewise.
        (malloc_state_machine::m_free): New field
        (malloc_state_machine::m_scalar_delete): Likewise.
        (malloc_state_machine::m_vector_delete): Likewise.
        (malloc_state_machine::deallocator_map_t): New typedef.
        (malloc_state_machine::m_deallocator_map): New field.
        (malloc_state_machine::deallocator_set_cache_t): New typedef.
        (malloc_state_machine::m_custom_deallocator_set_cache): New field.
        (malloc_state_machine::custom_deallocator_set_map_t): New typedef.
        (malloc_state_machine::m_custom_deallocator_set_map): New field.
        (malloc_state_machine::m_dynamic_sets): New field.
        (malloc_state_machine::m_dynamic_deallocators): New field.
        (api::api): Delete.
        (deallocator::deallocator): New ctor.
        (deallocator::hash): New.
        (deallocator::dump_to_pp): New.
        (deallocator::cmp): New.
        (deallocator::cmp_ptr_ptr): New.
        (standard_deallocator::standard_deallocator): New ctor.
        (deallocator_set::deallocator_set): New ctor.
        (deallocator_set::dump): New.
        (custom_deallocator_set::custom_deallocator_set): New ctor.
        (custom_deallocator_set::contains_p): New.
        (custom_deallocator_set::maybe_get_single): New.
        (custom_deallocator_set::dump_to_pp): New.
        (standard_deallocator_set::standard_deallocator_set): New ctor.
        (standard_deallocator_set::contains_p): New.
        (standard_deallocator_set::maybe_get_single): New.
        (standard_deallocator_set::dump_to_pp): New.
        (start_p): New.
        (class mismatching_deallocation): Update for conversion from api
        to deallocator_set and deallocator.
        (double_free::emit): Use %qs.
        (class use_after_free): Update for conversion from api to
        deallocator_set and deallocator.
        (malloc_leak::describe_state_change): Only emit "allocated here" on
        a start->nonnull transition, rather than on other transitions to
        nonnull.
        (allocation_state::dump_to_pp): Update for conversion from api to
        deallocator_set.
        (allocation_state::get_nonnull): Likewise.
        (malloc_state_machine::malloc_state_machine): Likewise.
        (malloc_state_machine::~malloc_state_machine): New.
        (malloc_state_machine::add_state): Update for conversion from api
        to deallocator_set.
        (malloc_state_machine::get_or_create_custom_deallocator_set): New.
        (malloc_state_machine::maybe_create_custom_deallocator_set): New.
        (malloc_state_machine::get_or_create_deallocator): New.
        (malloc_state_machine::on_stmt): Update for conversion from api
        to deallocator_set.  Handle "__attribute__((malloc(FOO)))", and
        the special attribute set on FOO.
        (malloc_state_machine::on_allocator_call): Update for conversion
        from api to deallocator_set.  Add "returns_nonnull" param and use
        it to affect which state to transition to.
        (malloc_state_machine::on_deallocator_call): Update for conversion
        from api to deallocator_set.

2021-01-14  David Malcolm  <dmalcolm@redhat.com>

        * engine.cc (strongly_connected_components::to_json): New.
        (worklist::to_json): New.
        (exploded_graph::to_json): JSON-ify the worklist.
        * exploded-graph.h (strongly_connected_components::to_json): New
        decl.
        (worklist::to_json): New decl.
        * store.cc (store::to_json): Fix comment.
        * supergraph.cc (supernode::to_json): Fix reference to
        "returning_call" in comment.  Add optional "fun" to JSON.
        (edge_kind_to_string): New.
        (superedge::to_json): Add "kind" to JSON.

2021-01-14  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/98679
        * analyzer.h (region_offset::operator==): Make const.
        * pending-diagnostic.h (pending_diagnostic::equal_p): Likewise.
        * store.h (binding_cluster::for_each_value): Likewise.
        (binding_cluster::for_each_binding): Likewise.

2021-01-12  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/98628
        * store.cc (binding_cluster::make_unknown_relative_to): Don't mark
        dereferenced unknown pointers as having escaped.

2021-01-07  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/98580
        * region.cc (decl_region::get_svalue_for_initializer): Gracefully
        handle when LTO writes out DECL_INITIAL as error_mark_node.

2021-01-07  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/97074
        * store.cc (binding_cluster::can_merge_p): Add "out_store" param
        and pass to calls to binding_cluster::make_unknown_relative_to.
        (binding_cluster::make_unknown_relative_to): Add "out_store"
        param.  Use it to mark base regions that are pointed to by
        pointers that become unknown as having escaped.
        (store::can_merge_p): Pass out_store to
        binding_cluster::can_merge_p.
        * store.h (binding_cluster::can_merge_p): Add "out_store" param.
        (binding_cluster::make_unknown_relative_to): Likewise.
        * svalue.cc (region_svalue::implicitly_live_p): New vfunc.
        * svalue.h (region_svalue::implicitly_live_p): New vfunc decl.

2021-01-07  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/98564
        * engine.cc (exploded_path::feasible_p): Add missing call to
        bitmap_clear.

2021-01-06  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/97072
        * region-model-reachability.cc (reachable_regions::init_cluster):
        Convert symbolic region handling to a switch statement.  Add cases
        to handle SK_UNKNOWN and SK_CONJURED.

2021-01-05  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/98293
        * store.cc (binding_map::apply_ctor_to_region): When "index" is
        NULL, iterate through the fields for RECORD_TYPEs, rather than
        creating an INTEGER_CST index.

2020-11-30  David Malcolm  <dmalcolm@redhat.com>

        * analyzer-pass.cc: Include "analyzer/analyzer.h" for the
        declaration of sorry_no_analyzer; include "tree.h" and
        "function.h" as these are needed by it.

2020-11-30  David Malcolm  <dmalcolm@redhat.com>

        * analyzer-pass.cc (pass_analyzer::execute): Move sorry call to...
        (sorry_no_analyzer): New.
        * analyzer.h (class state_machine): New forward decl.
        (class logger): New forward decl.
        (class plugin_analyzer_init_iface): New.
        (sorry_no_analyzer): New decl.
        * checker-path.cc (checker_path::fixup_locations): New.
        * checker-path.h (checker_event::set_location): New.
        (checker_path::fixup_locations): New decl.
        * diagnostic-manager.cc
        (diagnostic_manager::emit_saved_diagnostic): Call
        checker_path::fixup_locations, and call fixup_location
        on the primary location.
        * engine.cc: Include "plugin.h".
        (class plugin_analyzer_init_impl): New.
        (impl_run_checkers): Invoke PLUGIN_ANALYZER_INIT callbacks.
        * pending-diagnostic.h (pending_diagnostic::fixup_location): New
        vfunc.

2020-11-18  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/97893
        * sm-malloc.cc (null_deref::emit): Use CWE-476 rather than
        CWE-690, as this isn't due to an unchecked return value.
        (null_arg::emit): Likewise.

2020-11-12  David Malcolm  <dmalcolm@redhat.com>

        * checker-path.h (checker_event::get_id_ptr): New.
        * diagnostic-manager.cc (path_builder::path_builder): Add "sd"
        param and use it to initialize new field "m_sd".
        (path_builder::get_pending_diagnostic): New.
        (path_builder::m_sd): New field.
        (diagnostic_manager::emit_saved_diagnostic): Pass sd to
        path_builder ctor.
        (diagnostic_manager::add_events_for_superedge): Call new
        maybe_add_custom_events_for_superedge vfunc.
        * engine.cc (stale_jmp_buf::stale_jmp_buf): Add "setjmp_point"
        param and use it to initialize new field "m_setjmp_point".
        Initialize new field "m_stack_pop_event".
        (stale_jmp_buf::maybe_add_custom_events_for_superedge): New vfunc
        implementation.
        (stale_jmp_buf::describe_final_event): New vfunc implementation.
        (stale_jmp_buf::m_setjmp_point): New field.
        (stale_jmp_buf::m_stack_pop_event): New field.
        (exploded_node::on_longjmp): Pass setjmp_point to stale_jmp_buf
        ctor.
        * pending-diagnostic.h
        (pending_diagnostic::maybe_add_custom_events_for_superedge): New
        vfunc.

2020-11-12  David Malcolm  <dmalcolm@redhat.com>

        PR tree-optimization/97424
        * analyzer.opt (Wanalyzer-shift-count-negative): New.
        (Wanalyzer-shift-count-overflow): New.
        * region-model.cc (class shift_count_negative_diagnostic): New.
        (class shift_count_overflow_diagnostic): New.
        (region_model::get_gassign_result): Complain about shift counts that
        are negative or are >= the operand's type's width.

2020-11-10  Martin Liska  <mliska@suse.cz>

        * constraint-manager.cc (constraint_manager::merge): Remove
        unused code.
        * constraint-manager.h: Likewise.
        * program-state.cc (sm_state_map::sm_state_map): Likewise.
        (program_state::program_state): Likewise.
        (test_sm_state_map): Likewise.
        * program-state.h: Likewise.
        * region-model-reachability.cc (reachable_regions::reachable_regions): Likewise.
        * region-model-reachability.h: Likewise.
        * region-model.cc (region_model::handle_unrecognized_call): Likewise.
        (region_model::get_reachable_svalues): Likewise.
        (region_model::can_merge_with_p): Likewise.

2020-11-05  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/97668
        * svalue.cc (cmp_cst): Handle COMPLEX_CST.

2020-10-29  David Malcolm  <dmalcolm@redhat.com>

        * program-state.cc (sm_state_map::on_liveness_change): Sort the
        leaking svalues before calling on_state_leak.
        (program_state::detect_leaks): Likewise when calling
        on_svalue_leak.
        * region-model-reachability.cc
        (reachable_regions::mark_escaped_clusters): Likewise when
        calling on_escaped_function.

2020-10-29  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/97608
        * region-model-reachability.cc (reachable_regions::handle_sval):
        Operands of reachable reversible operations are reachable.

2020-10-29  David Malcolm  <dmalcolm@redhat.com>

        * analyzer.h (class state_machine): New forward decl.
        (class logger): Likewise.
        (class visitor): Likewise.
        * complexity.cc: New file, taken from svalue.cc.
        * complexity.h: New file, taken from region-model.h.
        * region-model.h: Include "analyzer/svalue.h" and
        "analyzer/region.h".  Move struct complexity to complexity.h.
        Move svalue, its subclasses and supporting decls to svalue.h.
        Move region, its subclasses and supporting decls to region.h.
        * region.cc: Include "analyzer/region.h".
        (symbolic_region::symbolic_region): Move here from region-model.h.
        * region.h: New file, based on material from region-model.h.
        * svalue.cc: Include "analyzer/svalue.h".
        (complexity::complexity): Move to complexity.cc.
        (complexity::from_pair): Likewise.
        * svalue.h: New file, based on material from region-model.h.

2020-10-29  David Malcolm  <dmalcolm@redhat.com>

        * program-state.cc (sm_state_map::print): Guard the printing of
        the origin pointer with !flag_dump_noaddr.
        * region.cc (string_region::dump_to_pp): Likewise for
        m_string_cst.

2020-10-27  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/97568
        * region-model.cc (region_model::get_initial_value_for_global):
        Move check that !DECL_EXTERNAL from here to...
        * region.cc (decl_region::get_svalue_for_initializer): ...here,
        using it to reject zero initialization.

2020-10-27  Markus Böck  <markus.boeck02@gmail.com>

        PR analyzer/96608
        * store.h (hash): Cast to intptr_t instead of long

2020-10-27  David Malcolm  <dmalcolm@redhat.com>

        * constraint-manager.cc (svalue_cmp_by_ptr): Delete.
        (equiv_class::canonicalize): Use svalue::cmp_ptr_ptr instead.
        (equiv_class_cmp): Eliminate pointer comparison.
        * diagnostic-manager.cc (dedupe_key::comparator): If they are at
        the same location, also compare epath ength and pending_diagnostic
        kind.
        * engine.cc (readability_comparator): If two path_vars have the
        same readability, then impose an arbitrary ordering on them.
        (worklist::key_t::cmp): If two points have the same plan ordering,
        continue the comparison.  Call sm_state_map::cmp rather than
        comparing hash values.
        * program-state.cc (sm_state_map::entry_t::cmp): New.
        (sm_state_map::cmp): New.
        * program-state.h (sm_state_map::entry_t::cmp): New decl.
        (sm_state_map::elements): New.
        (sm_state_map::cmp): New.

2020-10-27  David Malcolm  <dmalcolm@redhat.com>

        * engine.cc (setjmp_record::cmp): New.
        (supernode_cluster::dump_dot): Avoid embedding pointer in cluster
        name.
        (supernode_cluster::cmp_ptr_ptr): New.
        (function_call_string_cluster::dump_dot): Avoid embedding pointer
        in cluster name.  Sort m_map when dumping child clusters.
        (function_call_string_cluster::cmp_ptr_ptr): New.
        (root_cluster::dump_dot): Sort m_map when dumping child clusters.
        * program-point.cc (function_point::cmp): New.
        (function_point::cmp_ptr): New.
        * program-point.h (function_point::cmp): New decl.
        (function_point::cmp_ptr): New decl.
        * program-state.cc (sm_state_map::print): Sort the values.  Guard
        the printing of pointers with !flag_dump_noaddr.
        (program_state::prune_for_point): Sort the regions.
        (log_set_of_svalues): Sort the values.  Guard the printing of
        pointers with !flag_dump_noaddr.
        * region-model-manager.cc (log_uniq_map): Sort the values.
        * region-model-reachability.cc (dump_set): New function template.
        (reachable_regions::dump_to_pp): Use it.
        * region-model.h (svalue::cmp_ptr): New decl.
        (svalue::cmp_ptr_ptr): New decl.
        (setjmp_record::cmp): New decl.
        (placeholder_svalue::get_name): New accessor.
        (widening_svalue::get_point): New accessor.
        (compound_svalue::get_map): New accessor.
        (conjured_svalue::get_stmt): New accessor.
        (conjured_svalue::get_id_region): New accessor.
        (region::cmp_ptrs): Rename to...
        (region::cmp_ptr_ptr): ...this.
        * region.cc (region::cmp_ptrs): Rename to...
        (region::cmp_ptr_ptr): ...this.
        * state-purge.cc
        (state_purge_per_ssa_name::state_purge_per_ssa_name): Sort
        m_points_needing_name when dumping.
        * store.cc (concrete_binding::cmp_ptr_ptr): New.
        (symbolic_binding::cmp_ptr_ptr): New.
        (binding_map::cmp): New.
        (get_sorted_parent_regions): Update for renaming of
        region::cmp_ptrs to region::cmp_ptr_ptr.
        (store::dump_to_pp): Likewise.
        (store::to_json): Likewise.
        (store::can_merge_p): Sort the base regions before considering
        them.
        * store.h (concrete_binding::cmp_ptr_ptr): New decl.
        (symbolic_binding::cmp_ptr_ptr): New decl.
        (binding_map::cmp): New decl.
        * supergraph.cc (supergraph::supergraph): Assign UIDs to the
        gimple stmts.
        * svalue.cc (cmp_cst): New.
        (svalue::cmp_ptr): New.
        (svalue::cmp_ptr_ptr): New.

2020-10-27  David Malcolm  <dmalcolm@redhat.com>

        * engine.cc (exploded_graph::get_or_create_node): Fix off-by-one
        when imposing param_analyzer_max_enodes_per_program_point limit.

2020-10-27  David Malcolm  <dmalcolm@redhat.com>

        * region-model.cc (region_model::get_representative_path_var):
        Implement case RK_LABEL.
        * region-model.h (label_region::get_label): New accessor.

2020-10-22  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/97514
        * engine.cc (exploded_graph::add_function_entry): Handle failure
        to create an enode, rather than asserting.

2020-10-22  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/97489
        * engine.cc (exploded_graph::add_function_entry): Assert that we
        have a function body.
        (exploded_graph::on_escaped_function): Reject fndecls that don't
        have a function body.

2020-10-14  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93388
        * region-model.cc (region_model::get_initial_value_for_global):
        Fall back to returning an initial_svalue if
        decl_region::get_svalue_for_initializer fails.
        * region.cc (decl_region::get_svalue_for_initializer): Don't
        attempt to create a compound_svalue if the region has an unknown
        size.

2020-10-14  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93723
        * store.cc (binding_map::apply_ctor_to_region): Remove redundant
        assertion.

2020-10-12  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/97258
        * engine.cc (impl_region_model_context::on_escaped_function): New
        vfunc.
        (exploded_graph::add_function_entry): Use m_functions_with_enodes
        to implement idempotency.
        (add_any_callbacks): New.
        (exploded_graph::build_initial_worklist): Use the above to find
        callbacks that are reachable from global initializers.
        (exploded_graph::on_escaped_function): New.
        * exploded-graph.h
        (impl_region_model_context::on_escaped_function): New decl.
        (exploded_graph::on_escaped_function): New decl.
        (exploded_graph::m_functions_with_enodes): New field.
        * region-model-reachability.cc
        (reachable_regions::reachable_regions): Replace "store" param with
        "model" param; use it to initialize m_model.
        (reachable_regions::add): When getting the svalue for the region,
        call get_store_value on the model rather than using an initial
        value.
        (reachable_regions::mark_escaped_clusters): Add ctxt param and
        use it to call on_escaped_function when a function_region escapes.
        * region-model-reachability.h
        (reachable_regions::reachable_regions): Replace "store" param with
        "model" param.
        (reachable_regions::mark_escaped_clusters): Add ctxt param.
        (reachable_regions::m_model): New field.
        * region-model.cc (region_model::handle_unrecognized_call): Update
        for change in reachable_regions ctor.
        (region_model::handle_unrecognized_call): Pass ctxt to
        mark_escaped_clusters.
        (region_model::get_reachable_svalues): Update for change in
        reachable_regions ctor.
        (region_model::get_initial_value_for_global): Read-only variables
        keep their initial values.
        * region-model.h (region_model_context::on_escaped_function): New
        vfunc.
        (noop_region_model_context::on_escaped_function): New.

2020-10-12  David Malcolm  <dmalcolm@redhat.com>

        * analyzer.opt (Wanalyzer-write-to-const): New.
        (Wanalyzer-write-to-string-literal): New.
        * region-model-impl-calls.cc (region_model::impl_call_memcpy):
        Call check_for_writable_region.
        (region_model::impl_call_memset): Likewise.
        (region_model::impl_call_strcpy): Likewise.
        * region-model.cc (class write_to_const_diagnostic): New.
        (class write_to_string_literal_diagnostic): New.
        (region_model::check_for_writable_region): New.
        (region_model::set_value): Call check_for_writable_region.
        * region-model.h (region_model::check_for_writable_region): New
        decl.

2020-10-07  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/97116
        * sm-malloc.cc (method_p): New.
        (describe_argument_index): New.
        (inform_nonnull_attribute): Use describe_argument_index.
        (possible_null_arg::describe_final_event): Likewise.
        (null_arg::describe_final_event): Likewise.

2020-09-29  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/95188
        * engine.cc (stmt_requires_new_enode_p): Split enodes before
        "signal" calls.

2020-09-29  David Malcolm  <dmalcolm@redhat.com>

        * constraint-manager.cc
        (constraint_manager::add_constraint_internal): Whitespace fixes.
        Silence -Wsign-compare warning.
        * engine.cc (maybe_process_run_of_before_supernode_enodes):
        Silence -Wsign-compare warning.

2020-09-28  David Malcolm  <dmalcolm@redhat.com>

        * region-model.h (binop_svalue::dyn_cast_binop_svalue): Remove
        redundant "virtual".  Add FINAL OVERRIDE.
        (widening_svalue::dyn_cast_widening_svalue): Add FINAL OVERRIDE.
        (compound_svalue::dyn_cast_compound_svalue): Likewise.
        (conjured_svalue::dyn_cast_conjured_svalue): Likewise.

2020-09-28  David Malcolm  <dmalcolm@redhat.com>

        * diagnostic-manager.cc (null_assignment_sm_context::m_visitor):
        Remove unused field.

2020-09-28  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/97233
        * analyzer.cc (is_longjmp_call_p): Require the initial argument
        to be a pointer.
        * engine.cc (exploded_node::on_longjmp): Likewise.

2020-09-28  David Malcolm  <dmalcolm@redhat.com>

        * program-state.cc (sm_state_map::print): Update check
        for m_global_state being the start state.

2020-09-26  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96646
        PR analyzer/96841
        * region-model.cc (region_model::get_representative_path_var):
        When handling offset_region, wrap the MEM_REF's first argument in
        an ADDR_EXPR of pointer type, rather than simply using the tree
        for the parent region.  Require the MEM_REF's second argument to
        be an integer constant.

2020-09-24  David Malcolm  <dmalcolm@redhat.com>

        * analyzer.h (struct rejected_constraint): New decl.
        * analyzer.opt (fanalyzer-feasibility): New option.
        * diagnostic-manager.cc (path_builder::path_builder): Add
        "problem" param and use it to initialize new field.
        (path_builder::get_feasibility_problem): New accessor.
        (path_builder::m_feasibility_problem): New field.
        (dedupe_winners::add): Remove inversion of logic in "if" clause,
        swapping if/else suites.  In the !feasible_p suite, inspect
        flag_analyzer_feasibility and add code to handle when this
        is off, accepting the infeasible path, but recording the
        feasibility_problem.
        (diagnostic_manager::emit_saved_diagnostic): Pass the
        feasibility_problem to the path_builder.
        (diagnostic_manager::add_events_for_eedge): If we have
        a feasibility_problem at this edge, use it to add a custom event.
        * engine.cc (exploded_path::feasible_p): Pass a
        rejected_constraint ** to model.maybe_update_for_edge and transfer
        ownership of any created instance to any feasibility_problem.
        (feasibility_problem::dump_to_pp): New.
        * exploded-graph.h (feasibility_problem::feasibility_problem):
        Drop "model" param; add rejected_constraint * param.
        (feasibility_problem::~feasibility_problem): New.
        (feasibility_problem::dump_to_pp): New decl.
        (feasibility_problem::m_model): Drop field.
        (feasibility_problem::m_rc): New field.
        * program-point.cc (function_point::get_location): Handle
        PK_BEFORE_SUPERNODE and PK_AFTER_SUPERNODE.
        * program-state.cc (program_state::on_edge): Pass NULL to new
        param of region_model::maybe_update_for_edge.
        * region-model.cc (region_model::add_constraint): New overload
        adding a rejected_constraint ** param.
        (region_model::maybe_update_for_edge): Add rejected_constraint **
        param and pass it to the various apply_constraints_for_ calls.
        (region_model::apply_constraints_for_gcond): Add
        rejected_constraint ** param and pass it to add_constraint calls.
        (region_model::apply_constraints_for_gswitch): Likewise.
        (region_model::apply_constraints_for_exception): Likewise.
        (rejected_constraint::dump_to_pp): New.
        * region-model.h (region_model::maybe_update_for_edge):
        Add rejected_constraint ** param.
        (region_model::add_constraint): New overload adding a
        rejected_constraint ** param.
        (region_model::apply_constraints_for_gcond): Add
        rejected_constraint ** param.
        (region_model::apply_constraints_for_gswitch): Likewise.
        (region_model::apply_constraints_for_exception): Likewise.
        (struct rejected_constraint): New.

2020-09-23  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/97178
        * engine.cc (impl_run_checkers): Update for change to ext_state
        ctor.
        * program-state.cc (selftest::test_sm_state_map): Pass an engine
        instance to ext_state ctor.
        (selftest::test_program_state_1): Likewise.
        (selftest::test_program_state_2): Likewise.
        (selftest::test_program_state_merging): Likewise.
        (selftest::test_program_state_merging_2): Likewise.
        * program-state.h (extrinsic_state::extrinsic_state): Remove NULL
        default value for "eng" param.

2020-09-23  Tobias Burnus  <tobias@codesourcery.com>

        * analyzer-logging.cc: Guard '#pragma ... ignored "-Wformat-diag"'
        by '#if __GNUC__ >= 10'
        * analyzer.h: Likewise.
        * call-string.cc: Likewise.

2020-09-23  David Malcolm  <dmalcolm@redhat.com>

        * engine.cc (exploded_node::on_stmt): Replace sequence of dyn_cast
        with switch.

2020-09-22  David Malcolm  <dmalcolm@redhat.com>

        * analysis-plan.cc: Include "json.h".
        * analyzer.opt (fdump-analyzer-json): New.
        * call-string.cc: Include "json.h".
        (call_string::to_json): New.
        * call-string.h (call_string::to_json): New decl.
        * checker-path.cc: Include "json.h".
        * constraint-manager.cc: Include "json.h".
        (equiv_class::to_json): New.
        (constraint::to_json): New.
        (constraint_manager::to_json): New.
        * constraint-manager.h (equiv_class::to_json): New decl.
        (constraint::to_json): New decl.
        (constraint_manager::to_json): New decl.
        * diagnostic-manager.cc: Include "json.h".
        (saved_diagnostic::to_json): New.
        (diagnostic_manager::to_json): New.
        * diagnostic-manager.h (saved_diagnostic::to_json): New decl.
        (diagnostic_manager::to_json): New decl.
        * engine.cc: Include "json.h", <zlib.h>.
        (exploded_node::status_to_str): New.
        (exploded_node::to_json): New.
        (exploded_edge::to_json): New.
        (exploded_graph::to_json): New.
        (dump_analyzer_json): New.
        (impl_run_checkers): Call it.
        * exploded-graph.h (exploded_node::status_to_str): New decl.
        (exploded_node::to_json): New.
        (exploded_edge::to_json): New.
        (exploded_graph::to_json): New.
        * pending-diagnostic.cc: Include "json.h".
        * program-point.cc: Include "json.h".
        (program_point::to_json): New.
        * program-point.h (program_point::to_json): New decl.
        * program-state.cc: Include "json.h".
        (extrinsic_state::to_json): New.
        (sm_state_map::to_json): New.
        (program_state::to_json): New.
        * program-state.h (extrinsic_state::to_json): New decl.
        (sm_state_map::to_json): New decl.
        (program_state::to_json): New decl.
        * region-model-impl-calls.cc: Include "json.h".
        * region-model-manager.cc: Include "json.h".
        * region-model-reachability.cc: Include "json.h".
        * region-model.cc: Include "json.h".
        * region-model.h (svalue::to_json): New decl.
        (region::to_json): New decl.
        * region.cc: Include "json.h".
        (region::to_json: New.
        * sm-file.cc: Include "json.h".
        * sm-malloc.cc: Include "json.h".
        * sm-pattern-test.cc: Include "json.h".
        * sm-sensitive.cc: Include "json.h".
        * sm-signal.cc: Include "json.h".
        (signal_delivery_edge_info_t::to_json): New.
        * sm-taint.cc: Include "json.h".
        * sm.cc: Include "diagnostic.h", "tree-diagnostic.h", and
        "json.h".
        (state_machine::state::to_json): New.
        (state_machine::to_json): New.
        * sm.h (state_machine::state::to_json): New.
        (state_machine::to_json): New.
        * state-purge.cc: Include "json.h".
        * store.cc: Include "json.h".
        (binding_key::get_desc): New.
        (binding_map::to_json): New.
        (binding_cluster::to_json): New.
        (store::to_json): New.
        * store.h (binding_key::get_desc): New decl.
        (binding_map::to_json): New decl.
        (binding_cluster::to_json): New decl.
        (store::to_json): New decl.
        * supergraph.cc: Include "json.h".
        (supergraph::to_json): New.
        (supernode::to_json): New.
        (superedge::to_json): New.
        * supergraph.h (supergraph::to_json): New decl.
        (supernode::to_json): New decl.
        (superedge::to_json): New decl.
        * svalue.cc: Include "json.h".
        (svalue::to_json): New.

2020-09-21  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/97130
        * region-model-impl-calls.cc (call_details::get_arg_type): New.
        * region-model.cc (region_model::on_call_pre): Check that the
        initial arg is a pointer before calling impl_call_memset and
        impl_call_strlen.
        * region-model.h (call_details::get_arg_type): New decl.

2020-09-21  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93355
        * sm-malloc.cc (malloc_state_machine::get_default_state): Look at
        the base region when considering pointers.  Treat pointers to
        decls as being non-heap.

2020-09-18  David Malcolm  <dmalcolm@redhat.com>

        * checker-path.cc (warning_event::get_desc): Handle global state
        changes.

2020-09-18  David Malcolm  <dmalcolm@redhat.com>

        * sm-malloc.cc (malloc_state_machine::on_stmt): Handle strdup and
        strndup as being malloc-like allocators.

2020-09-16  David Malcolm  <dmalcolm@redhat.com>

        * engine.cc (strongly_connected_components::strong_connect): Only
        consider intraprocedural edges when creating SCCs.
        (worklist::key_t::cmp): Add comment.  Treat call_string
        differences as more important than differences of program_point
        within a supernode.

2020-09-16  David Malcolm  <dmalcolm@redhat.com>

        * engine.cc (supernode_cluster::dump_dot): Show the SCC id
        in the per-supernode clusters in FILENAME.eg.dot output.
        (exploded_graph_annotator::add_node_annotations):
        Show the SCC of the supernode in FILENAME.supernode.eg.dot output.
        * exploded-graph.h (worklist::scc_id): New.
        (exploded_graph::get_scc_id): New.

2020-09-16  David Malcolm  <dmalcolm@redhat.com>

        * engine.cc (exploded_node::dump_dot): Show STATUS_BULK_MERGED.
        (exploded_graph::process_worklist): Call
        maybe_process_run_of_before_supernode_enodes.
        (exploded_graph::maybe_process_run_of_before_supernode_enodes):
        New.
        (exploded_graph_annotator::print_enode): Show STATUS_BULK_MERGED.
        * exploded-graph.h (enum exploded_node::status): Add
        STATUS_BULK_MERGED.

2020-09-16  David Malcolm  <dmalcolm@redhat.com>

        * engine.cc
        (exploded_graph::process_node) <case PK_BEFORE_SUPERNODE>:
        Simplify by using program_point::get_next.
        * program-point.cc (program_point::get_next): New.
        * program-point.h (program_point::get_next): New decl.

2020-09-16  David Malcolm  <dmalcolm@redhat.com>

        * engine.cc (exploded_graph::get_or_create_node): Show the
        program point when issuing -Wanalyzer-too-complex due to hitting
        the per-program-point limit.

2020-09-16  David Malcolm  <dmalcolm@redhat.com>

        * region-model.cc (region_model::on_call_pre): Treat getchar as
        having no side-effects.

2020-09-15  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96650
        * constraint-manager.cc (merger_fact_visitor::on_fact): Replace
        assertion that add_constraint succeeded with an assertion that
        if it fails, -fanalyzer-transitivity is off.

2020-09-14  David Malcolm  <dmalcolm@redhat.com>

        * analyzer.opt (-param=analyzer-max-constraints=): New param.
        * constraint-manager.cc
        (constraint_manager::add_constraint_internal): Silently reject
        attempts to add constraints when the above limit is reached.

2020-09-14  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96653
        * constraint-manager.cc
        (constraint_manager::get_or_add_equiv_class): Don't accumulate
        transitive closure of all constraints on constants.

2020-09-14  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/97029
        * analyzer.cc (is_setjmp_call_p): Require the initial arg to be a
        pointer.
        * region-model.cc (region_model::deref_rvalue): Assert that the
        svalue is of pointer type.

2020-09-11  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96798
        * region-model-impl-calls.cc (region_model::impl_call_memcpy):
        New.
        (region_model::impl_call_strcpy): New.
        * region-model.cc (region_model::on_call_pre): Flag unhandled
        builtins that are non-pure as having unknown side-effects.
        Implement BUILT_IN_MEMCPY, BUILT_IN_MEMCPY_CHK, BUILT_IN_STRCPY,
        BUILT_IN_STRCPY_CHK, BUILT_IN_FPRINTF, BUILT_IN_FPRINTF_UNLOCKED,
        BUILT_IN_PUTC, BUILT_IN_PUTC_UNLOCKED, BUILT_IN_FPUTC,
        BUILT_IN_FPUTC_UNLOCKED, BUILT_IN_FPUTS, BUILT_IN_FPUTS_UNLOCKED,
        BUILT_IN_FWRITE, BUILT_IN_FWRITE_UNLOCKED, BUILT_IN_PRINTF,
        BUILT_IN_PRINTF_UNLOCKED, BUILT_IN_PUTCHAR,
        BUILT_IN_PUTCHAR_UNLOCKED, BUILT_IN_PUTS, BUILT_IN_PUTS_UNLOCKED,
        BUILT_IN_VFPRINTF, BUILT_IN_VPRINTF.
        * region-model.h (region_model::impl_call_memcpy): New decl.
        (region_model::impl_call_strcpy): New decl.

2020-09-09  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/94355
        * analyzer.opt (Wanalyzer-mismatching-deallocation): New warning.
        * region-model-impl-calls.cc
        (region_model::impl_call_operator_new): New.
        (region_model::impl_call_operator_delete): New.
        * region-model.cc (region_model::on_call_pre): Detect operator new
        and operator delete.
        (region_model::on_call_post): Likewise.
        (region_model::maybe_update_for_edge): Detect EH edges and call...
        (region_model::apply_constraints_for_exception): New function.
        * region-model.h (region_model::impl_call_operator_new): New decl.
        (region_model::impl_call_operator_delete): New decl.
        (region_model::apply_constraints_for_exception): New decl.
        * sm-malloc.cc (enum resource_state): New.
        (struct allocation_state): New state subclass.
        (enum wording): New.
        (struct api): New.
        (malloc_state_machine::custom_data_t): New typedef.
        (malloc_state_machine::add_state): New decl.
        (malloc_state_machine::m_unchecked)
        (malloc_state_machine::m_nonnull)
        (malloc_state_machine::m_freed): Delete these states in favor
        of...
        (malloc_state_machine::m_malloc)
        (malloc_state_machine::m_scalar_new)
        (malloc_state_machine::m_vector_new): ...this new api instances,
        which own their own versions of these states.
        (malloc_state_machine::on_allocator_call): New decl.
        (malloc_state_machine::on_deallocator_call): New decl.
        (api::api): New ctor.
        (dyn_cast_allocation_state): New.
        (as_a_allocation_state): New.
        (get_rs): New.
        (unchecked_p): New.
        (nonnull_p): New.
        (freed_p): New.
        (malloc_diagnostic::describe_state_change): Use unchecked_p and
        nonnull_p.
        (class mismatching_deallocation): New.
        (double_free::double_free): Add funcname param for initializing
        m_funcname.
        (double_free::emit): Use m_funcname in warning message rather
        than hardcoding "free".
        (double_free::describe_state_change): Likewise.  Use freed_p.
        (double_free::describe_call_with_state): Use freed_p.
        (double_free::describe_final_event): Use m_funcname in message
        rather than hardcoding "free".
        (double_free::m_funcname): New field.
        (possible_null::describe_state_change): Use unchecked_p.
        (possible_null::describe_return_of_state): Likewise.
        (use_after_free::use_after_free): Add param for initializing m_api.
        (use_after_free::emit): Use m_api->m_dealloc_funcname in message
        rather than hardcoding "free".
        (use_after_free::describe_state_change): Use freed_p.  Change the
        wording of the message based on the API.
        (use_after_free::describe_final_event): Use
        m_api->m_dealloc_funcname in message rather than hardcoding
        "free".  Change the wording of the message based on the API.
        (use_after_free::m_api): New field.
        (malloc_leak::describe_state_change): Use unchecked_p.  Update
        for renaming of m_malloc_event to m_alloc_event.
        (malloc_leak::describe_final_event): Update for renaming of
        m_malloc_event to m_alloc_event.
        (malloc_leak::m_malloc_event): Rename...
        (malloc_leak::m_alloc_event): ...to this.
        (free_of_non_heap::free_of_non_heap): Add param for initializing
        m_funcname.
        (free_of_non_heap::emit): Use m_funcname in message rather than
        hardcoding "free".
        (free_of_non_heap::describe_final_event): Likewise.
        (free_of_non_heap::m_funcname): New field.
        (allocation_state::dump_to_pp): New.
        (allocation_state::get_nonnull): New.
        (malloc_state_machine::malloc_state_machine): Update for changes
        to state fields and new api fields.
        (malloc_state_machine::add_state): New.
        (malloc_state_machine::on_stmt): Move malloc/calloc handling to
        on_allocator_call and call it, passing in the API pointer.
        Likewise for free, moving it to on_deallocator_call.  Handle calls
        to operator new and delete in an analogous way.  Use unchecked_p
        when testing for possibly-null-arg and possibly-null-deref, and
        transition to the non-null for the correct API.  Remove redundant
        node param from call to on_zero_assignment.  Use freed_p for
        use-after-free check, and pass in API.
        (malloc_state_machine::on_allocator_call): New, based on code in
        on_stmt.
        (malloc_state_machine::on_deallocator_call): Likewise.
        (malloc_state_machine::on_phi): Mark node param with
        ATTRIBUTE_UNUSED; don't pass it to on_zero_assignment.
        (malloc_state_machine::on_condition): Mark node param with
        ATTRIBUTE_UNUSED.  Replace on_transition calls with get_state and
        set_next_state pairs, transitioning to the non-null state for the
        appropriate API.
        (malloc_state_machine::can_purge_p): Port to new state approach.
        (malloc_state_machine::on_zero_assignment): Replace on_transition
        calls with get_state and set_next_state pairs.  Drop redundant
        node param.
        * sm.h (state_machine::add_custom_state): New.

2020-09-09  David Malcolm  <dmalcolm@redhat.com>

        * diagnostic-manager.cc
        (null_assignment_sm_context::warn_for_state): Replace with...
        (null_assignment_sm_context::warn): ...this.
        * engine.cc (impl_sm_context::warn_for_state): Replace with...
        (impl_sm_context::warn): ...this.
        * sm-file.cc (fileptr_state_machine::on_stmt): Replace
        warn_for_state and on_transition calls with a get_state
        test guarding warn and set_next_state calls.
        * sm-malloc.cc (malloc_state_machine::on_stmt): Likewise.
        * sm-pattern-test.cc (pattern_test_state_machine::on_condition):
        Replace warn_for_state call with warn call.
        * sm-sensitive.cc
        (sensitive_state_machine::warn_for_any_exposure): Replace
        warn_for_state call with a get_state test guarding a warn call.
        * sm-signal.cc (signal_state_machine::on_stmt): Likewise.
        * sm-taint.cc (taint_state_machine::on_stmt):  Replace
        warn_for_state and on_transition calls with a get_state
        test guarding warn and set_next_state calls.
        * sm.h (sm_context::warn_for_state): Replace with...
        (sm_context::warn): ...this.

2020-09-09  David Malcolm  <dmalcolm@redhat.com>

        * diagnostic-manager.cc
        (null_assignment_sm_context::null_assignment_sm_context): Add old_state
        and ext_state params, initializing m_old_state and m_ext_state.
        (null_assignment_sm_context::on_transition): Split into...
        (null_assignment_sm_context::get_state): ...this new vfunc
        implementation and...
        (null_assignment_sm_context::set_next_state): ...this new vfunc
        implementation.
        (null_assignment_sm_context::m_old_state): New field.
        (null_assignment_sm_context::m_ext_state): New field.
        (diagnostic_manager::add_events_for_eedge): Pass in old state and
        ext_state when creating sm_ctxt.
        * engine.cc (impl_sm_context::on_transition): Split into...
        (impl_sm_context::get_state): ...this new vfunc
        implementation and...
        (impl_sm_context::set_next_state): ...this new vfunc
        implementation.
        * sm.h (sm_context::get_state): New pure virtual function.
        (sm_context::set_next_state): Likewise.
        (sm_context::on_transition): Convert from a pure virtual function
        to a regular function implemented in terms of get_state and
        set_next_state.

2020-09-09  David Malcolm  <dmalcolm@redhat.com>

        * checker-path.cc (state_change_event::get_desc): Update
        state_machine::get_state_name calls to state::get_name.
        (warning_event::get_desc): Likewise.
        * diagnostic-manager.cc
        (null_assignment_sm_context::on_transition): Update comparison
        against 0 with comparison with m_sm.get_start_state.
        (diagnostic_manager::prune_for_sm_diagnostic): Update
        state_machine::get_state_name calls to state::get_name.
        * engine.cc (impl_sm_context::on_transition): Likewise.
        (exploded_node::get_dot_fillcolor): Use get_id when summing
        the sm states.
        * program-state.cc (sm_state_map::sm_state_map): Don't hardcode
        0 as the start state when initializing m_global_state.
        (sm_state_map::print): Use dump_to_pp rather than get_state_name
        when dumping states.
        (sm_state_map::is_empty_p): Don't hardcode 0 as the start state
        when examining m_global_state.
        (sm_state_map::hash): Use get_id when hashing states.
        (selftest::test_sm_state_map): Use state objects rather than
        arbitrary hardcoded integers.
        (selftest::test_program_state_merging): Likewise.
        (selftest::test_program_state_merging_2): Likewise.
        * sm-file.cc (fileptr_state_machine::m_start): Move to base class.
        (file_diagnostic::describe_state_change): Use get_start_state.
        (fileptr_state_machine::fileptr_state_machine): Drop m_start
        initialization.
        * sm-malloc.cc (malloc_state_machine::m_start): Move to base
        class.
        (malloc_diagnostic::describe_state_change): Use get_start_state.
        (possible_null::describe_state_change): Likewise.
        (malloc_state_machine::malloc_state_machine): Drop m_start
        initialization.
        * sm-pattern-test.cc (pattern_test_state_machine::m_start): Move
        to base class.
        (pattern_test_state_machine::pattern_test_state_machine): Drop
        m_start initialization.
        * sm-sensitive.cc (sensitive_state_machine::m_start): Move to base
        class.
        (sensitive_state_machine::sensitive_state_machine): Drop m_start
        initialization.
        * sm-signal.cc (signal_state_machine::m_start): Move to base
        class.
        (signal_state_machine::signal_state_machine): Drop m_start
        initialization.
        * sm-taint.cc (taint_state_machine::m_start): Move to base class.
        (taint_state_machine::taint_state_machine): Drop m_start
        initialization.
        * sm.cc (state_machine::state::dump_to_pp): New.
        (state_machine::state_machine): Move here from sm.h.  Initialize
        m_next_state_id and m_start.
        (state_machine::add_state): Reimplement in terms of state objects.
        (state_machine::get_state_name): Delete.
        (state_machine::get_state_by_name): Reimplement in terms of state
        objects.  Make const.
        (state_machine::validate): Delete.
        (state_machine::dump_to_pp): Reimplement in terms of state
        objects.
        * sm.h (state_machine::state): New class.
        (state_machine::state_t): Convert typedef from "unsigned" to
        "const state_machine::state *".
        (state_machine::state_machine): Move to sm.cc.
        (state_machine::get_default_state): Use m_start rather than
        hardcoding 0.
        (state_machine::get_state_name): Delete.
        (state_machine::get_state_by_name): Make const.
        (state_machine::get_start_state): New accessor.
        (state_machine::alloc_state_id): New.
        (state_machine::m_state_names): Drop in favor of...
        (state_machine::m_states): New field
        (state_machine::m_start): New field
        (start_start_p): Delete.

2020-09-08  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96949
        * store.cc (binding_map::apply_ctor_val_to_range): Add
        error-handling for the cases where we have symbolic offsets.

2020-09-08  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96950
        * store.cc (binding_map::apply_ctor_to_region): Handle RANGE_EXPR
        where min_index == max_index.
        (binding_map::apply_ctor_val_to_range): Replace assertion that we
        don't have a CONSTRUCTOR value with error-handling.

2020-09-08  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96962
        * region-model.cc (region_model::on_call_pre): Fix guard on switch
        on built-ins to only consider BUILT_IN_NORMAL, rather than other
        kinds of build-ins.

2020-09-01  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96792
        * region-model.cc (region_model::deref_rvalue): Add the constraint
        that PTR_SVAL is non-NULL.

2020-08-31  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96798
        * region-model.cc (region_model::on_call_pre): Handle
        BUILT_IN_MEMSET_CHK.

2020-08-31  David Malcolm  <dmalcolm@redhat.com>

        * region-model.cc (region_model::on_call_pre): Gather handling of
        builtins and of internal fns into switch statements.  Handle
        "alloca" and BUILT_IN_ALLOCA_WITH_ALIGN.

2020-08-31  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96860
        * region.cc (decl_region::get_svalue_for_constructor): Support
        apply_ctor_to_region failing.
        * store.cc (binding_map::apply_ctor_to_region): Add failure
        handling.
        (binding_map::apply_ctor_val_to_range): Likewise.
        (binding_map::apply_ctor_pair_to_child_region): Likewise.  Replace
        assertion that child_base_offset is not symbolic with error
        handling.
        * store.h (binding_map::apply_ctor_to_region): Convert return type
        from void to bool.
        (binding_map::apply_ctor_val_to_range): Likewise.
        (binding_map::apply_ctor_pair_to_child_region): Likewise.

2020-08-31  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96763
        * store.cc (binding_map::apply_ctor_to_region): Handle RANGE_EXPR
        by calling a new binding_map::apply_ctor_val_to_range subroutine.
        Split out the existing non-CONSTRUCTOR-handling code to a new
        apply_ctor_pair_to_child_region subroutine.
        (binding_map::apply_ctor_val_to_range): New.
        (binding_map::apply_ctor_pair_to_child_region): New, split out
        from binding_map::apply_ctor_to_region as noted above.
        * store.h (binding_map::apply_ctor_val_to_range): New decl.
        (binding_map::apply_ctor_pair_to_child_region): New decl.

2020-08-31  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96764
        * region-model-manager.cc
        (region_model_manager::maybe_fold_unaryop): Handle VIEW_CONVERT_EXPR.
        (region_model_manager::get_or_create_cast): Move logic for
        real->integer casting to...
        (get_code_for_cast): ...this new function, and add logic for
        real->non-integer casts.
        (region_model_manager::maybe_fold_sub_svalue): Handle
        VIEW_CONVERT_EXPR.
        * region-model.cc
        (region_model::add_any_constraints_from_gassign): Likewise.
        * svalue.cc (svalue::maybe_undo_cast): Likewise.
        (unaryop_svalue::dump_to_pp): Likewise.

2020-08-26  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/94858
        * region-model-manager.cc
        (region_model_manager::get_or_create_widening_svalue): Assert that
        neither of the inputs are themselves widenings.
        * store.cc (store::eval_alias_1): The initial value of a pointer
        can't point to a region that was allocated on the heap after the
        beginning of the path.  A widened pointer value can't alias anything
        that the initial pointer value can't alias.
        * svalue.cc (svalue::can_merge_p): Merge BINOP (X, OP, CST) with X
        to a widening svalue.  Merge
        BINOP(WIDENING(BASE, BINOP(BASE, X)), X) and BINOP(BASE, X) to
        to the LHS of the first BINOP.

2020-08-26  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96777
        * region-model.h (class compound_svalue): Document that all keys
        must be concrete.
        (compound_svalue::compound_svalue): Move definition to svalue.cc.
        * store.cc (binding_map::apply_ctor_to_region): Handle
        initializers for trailing arrays with incomplete size.
        * svalue.cc (compound_svalue::compound_svalue): Move definition
        here from region-model.h.  Add assertion that all keys are
        concrete.

2020-08-22  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/94851
        * region-model-manager.cc
        (region_model_manager::maybe_fold_binop): Fold bitwise "& 0" to 0.

2020-08-22  David Malcolm  <dmalcolm@redhat.com>

        * store.cc (store::eval_alias): Make const.  Split out 2nd half
        into store::eval_alias_1 and call it twice for symmetry, avoiding
        test duplication.
        (store::eval_alias_1): New function, split out from the above.
        * store.h (store::eval_alias): Make const.
        (store::eval_alias_1): New decl.

2020-08-22  David Malcolm  <dmalcolm@redhat.com>

        * region-model.cc (region_model::push_frame): Bind the default
        SSA name for each parm if it exists, falling back to the parm
        itself otherwise, rather than doing both.

2020-08-20  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96723
        * region-model-manager.cc
        (region_model_manager::get_field_region): Assert that field is a
        FIELD_DECL.
        * region.cc (region::get_subregions_for_binding): In
        union-handling, filter the TYPE_FIELDS traversal to just FIELD_DECLs.

2020-08-20  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96713
        * region-model.cc (region_model::get_gassign_result): For
        comparisons, only use eval_condition when the lhs has boolean
        type, and use get_or_create_constant_svalue on the boolean
        constants directly rather than via get_rvalue.

2020-08-19  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96643
        * region-model.cc (region_model::deref_rvalue): Rather than
        attempting to handle all svalue kinds in the switch, only cover
        the special cases, and move symbolic-region handling to after
        the switch, thus implicitly handling the missing case SK_COMPOUND.

2020-08-19  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96705
        * region-model-manager.cc
        (region_model_manager::maybe_fold_binop): Check that we have an
        integral type before calling build_int_cst.

2020-08-19  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96699
        * region-model-manager.cc
        (region_model_manager::get_or_create_cast): Use FIX_TRUNC_EXPR for
        casting from REAL_TYPE to INTEGER_TYPE.

2020-08-19  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96651
        * region-model.cc (region_model::called_from_main_p): New.
        (region_model::get_store_value): Move handling for globals into...
        (region_model::get_initial_value_for_global): ...this new
        function, and add logic for extracting values from decl
        initializers.
        * region-model.h (decl_region::get_svalue_for_constructor): New
        decl.
        (decl_region::get_svalue_for_initializer): New decl.
        (region_model::called_from_main_p): New decl.
        (region_model::get_initial_value_for_global): New.
        * region.cc (decl_region::maybe_get_constant_value): Move logic
        for getting an svalue from a CONSTRUCTOR node to...
        (decl_region::get_svalue_for_constructor): ...this new function.
        (decl_region::get_svalue_for_initializer): New.
        * store.cc (get_svalue_for_ctor_val): Rewrite in terms of
        region_model::get_rvalue.
        * store.h (binding_cluster::get_map): New accessor.

2020-08-19  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96648
        * region.cc (get_field_at_bit_offset): Gracefully handle negative
        values for bit_offset.

2020-08-18  David Malcolm  <dmalcolm@redhat.com>

        * region-model.cc (region_model::get_rvalue_1): Fix name of local.

2020-08-18  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96641
        * region-model.cc (region_model::get_rvalue_1): Handle
        unrecognized tree codes by returning "UNKNOWN.

2020-08-18  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96640
        * region-model.cc (region_model::get_gassign_result): Handle various
        VEC_* tree codes by returning UNKNOWN.
        (region_model::on_assignment): Handle unrecognized tree codes by
        setting lhs to an unknown value, rather than issuing a "sorry" and
        asserting.

2020-08-17  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96644
        * region-model-manager.cc (get_region_for_unexpected_tree_code):
        Handle ctxt being NULL.

2020-08-17  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96639
        * region.cc (region::get_subregions_for_binding): Check for "type"
        being NULL.

2020-08-17  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96642
        * store.cc (get_svalue_for_ctor_val): New.
        (binding_map::apply_ctor_to_region): Call it.

2020-08-14  David Malcolm  <dmalcolm@redhat.com>

        PR testsuite/96609
        PR analyzer/96616
        * region-model.cc (region_model::get_store_value): Call
        maybe_get_constant_value on decl_regions first.
        * region-model.h (decl_region::maybe_get_constant_value): New decl.
        * region.cc (decl_region::get_stack_depth): Likewise.
        (decl_region::maybe_get_constant_value): New.
        * store.cc (get_subregion_within_ctor): New.
        (binding_map::apply_ctor_to_region): New.
        * store.h (binding_map::apply_ctor_to_region): New decl.

2020-08-14  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/96611
        * store.cc (store::mark_as_escaped): Reject attempts to
        get a cluster for an unknown pointer.

2020-08-13  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93032
        PR analyzer/93938
        PR analyzer/94011
        PR analyzer/94099
        PR analyzer/94399
        PR analyzer/94458
        PR analyzer/94503
        PR analyzer/94640
        PR analyzer/94688
        PR analyzer/94689
        PR analyzer/94839
        PR analyzer/95026
        PR analyzer/95042
        PR analyzer/95240
        * analyzer-logging.cc: Ignore "-Wformat-diag".
        (logger::enter_scope): Use inc_indent in both overloads.
        (logger::exit_scope): Use dec_indent.
        * analyzer-logging.h (logger::inc_indent): New.
        (logger::dec_indent): New.
        * analyzer-selftests.cc (run_analyzer_selftests): Call
        analyzer_store_cc_tests.
        * analyzer-selftests.h (analyzer_store_cc_tests): New decl.
        * analyzer.cc (get_stmt_location): New function.
        * analyzer.h (class initial_svalue): New forward decl.
        (class unaryop_svalue): New forward decl.
        (class binop_svalue): New forward decl.
        (class sub_svalue): New forward decl.
        (class unmergeable_svalue): New forward decl.
        (class placeholder_svalue): New forward decl.
        (class widening_svalue): New forward decl.
        (class compound_svalue): New forward decl.
        (class conjured_svalue): New forward decl.
        (svalue_set): New typedef.
        (class map_region): Delete.
        (class array_region): Delete.
        (class frame_region): New forward decl.
        (class function_region): New forward decl.
        (class label_region): New forward decl.
        (class decl_region): New forward decl.
        (class element_region): New forward decl.
        (class offset_region): New forward decl.
        (class cast_region): New forward decl.
        (class field_region): New forward decl.
        (class string_region): New forward decl.
        (class region_model_manager): New forward decl.
        (class store_manager): New forward decl.
        (class store): New forward decl.
        (class call_details): New forward decl.
        (struct svalue_id_merger_mapping): Delete.
        (struct canonicalization): Delete.
        (class function_point): New forward decl.
        (class engine): New forward decl.
        (dump_tree): New function decl.
        (print_quoted_type): New function decl.
        (readability_comparator): New function decl.
        (tree_cmp): New function decl.
        (class path_var): Move here from region-model.h
        (bit_offset_t, bit_size_t, byte_size_t): New typedefs.
        (class region_offset): New class.
        (get_stmt_location): New decl.
        (struct member_function_hash_traits): New struct.
        (class consolidation_map): New class.
        Ignore "-Wformat-diag".
        * analyzer.opt (-param=analyzer-max-svalue-depth=): New param.
        (-param=analyzer-max-enodes-for-full-dump=): New param.
        * call-string.cc: Ignore -Wformat-diag.
        * checker-path.cc: Move includes of "analyzer/call-string.h" and
        "analyzer/program-point.h" to before "analyzer/region-model.h",
        and also include "analyzer/store.h" before it.
        (state_change_event::state_change_event): Replace "tree var" param
        with "const svalue *sval".  Convert "origin" param from tree to
        "const svalue *".
        (state_change_event::get_desc): Call get_representative_tree to
        convert the var and origin from const svalue * to tree.  Use
        svalue::get_desc rather than %qE when describing state changes.
        (checker_path::add_final_event): Use get_stmt_location.
        * checker-path.h (state_change_event::state_change_event): Port
        from tree to const svalue *.
        (state_change_event::get_lvalue): Delete.
        (state_change_event::get_dest_function): New.
        (state_change_event::m_var): Replace with...
        (state_change_event::m_sval): ...this.
        (state_change_event::m_origin): Convert from tree to
        const svalue *.
        * constraint-manager.cc: Include "analyzer/call-string.h",
        "analyzer/program-point.h", and "analyzer/store.h" before
        "analyzer/region-model.h".
        (struct bound, struct range): Move to constraint-manager.h.
        (compare_constants): New function.
        (range::dump): Rename to...
        (range::dump_to_pp): ...this.  Support NULL constants.
        (range::dump): Reintroduce for dumping to stderr.
        (range::constrained_to_single_element): Return result, rather than
        writing to *OUT.
        (range::eval_condition): New.
        (range::below_lower_bound): New.
        (range::above_upper_bound): New.
        (equiv_class::equiv_class): Port from svalue_id to const svalue *.
        (equiv_class::print): Likewise.
        (equiv_class::hash): Likewise.
        (equiv_class::operator==): Port from svalue_id to const svalue *.
        (equiv_class::add): Port from svalue_id to const svalue *. Drop
        "cm" param.
        (equiv_class::del): Port from svalue_id to const svalue *.
        (equiv_class::get_representative): Likewise.
        (equiv_class::remap_svalue_ids): Delete.
        (svalue_id_cmp_by_id): Rename to...
        (svalue_cmp_by_ptr): ...this, porting from svalue_id to
        const svalue *.
        (equiv_class::canonicalize): Update qsort comparator.
        (constraint::implied_by): New.
        (constraint_manager::constraint_manager): Copy m_mgr in copy ctor.
        (constraint_manager::dump_to_pp): Add "multiline" param
        (constraint_manager::dump): Pass "true" for "multiline".
        (constraint_manager::add_constraint): Port from svalue_id to
        const svalue *.  Split out second part into...
        (constraint_manager::add_unknown_constraint): ...this new
        function.  Remove self-constraints when merging equivalence
        classes.
        (constraint_manager::add_constraint_internal): Remove constraints
        that would be implied by the new constraint.  Port from svalue_id
        to const svalue *.
        (constraint_manager::get_equiv_class_by_sid): Rename to...
        (constraint_manager::get_equiv_class_by_svalue): ...this, porting
        from svalue_id to const svalue *.
        (constraint_manager::get_or_add_equiv_class): Port from svalue_id
        to const svalue *.
        (constraint_manager::eval_condition): Make const.  Call
        compare_constants and return early if it provides a known result.
        (constraint_manager::get_ec_bounds): New.
        (constraint_manager::eval_condition): New overloads.  Make
        existing one const, and use compare_constants.
        (constraint_manager::purge): Convert "p" param to a template
        rather that an abstract base class.  Port from svalue_id to
        const svalue *.
        (class dead_svalue_purger): New class.
        (constraint_manager::remap_svalue_ids): Delete.
        (constraint_manager::on_liveness_change): New.
        (equiv_class_cmp): Port from svalue_id to const svalue *.
        (constraint_manager::canonicalize): Likewise.  Combine with
        purging of redundant equivalence classes and constraints.
        (class cleaned_constraint_manager): Delete.
        (class merger_fact_visitor): Make "m_cm_b" const.  Add "m_merger"
        field.
        (merger_fact_visitor::fact): Port from svalue_id to const svalue *.
        Add special case for widening.
        (constraint_manager::merge): Port from svalue_id to const svalue *.
        (constraint_manager::clean_merger_input): Delete.
        (constraint_manager::for_each_fact): Port from svalue_id to
        const svalue *.
        (constraint_manager::validate): Likewise.
        (selftest::test_constraint_conditions): Provide a
        region_model_manager when creating region_model instances.
        Add test for self-equality not creating equivalence classes.
        (selftest::test_transitivity): Provide a region_model_manager when
        creating region_model instances.  Verify that EC-merging happens
        when constraints are implied.
        (selftest::test_constant_comparisons):  Provide a
        region_model_manager when creating region_model instances.
        (selftest::test_constraint_impl): Likewise.  Remove over-specified
        assertions.
        (selftest::test_equality): Provide a region_model_manager when
        creating region_model instances.
        (selftest::test_many_constants): Likewise.  Provide a
        program_point when testing merging.
        (selftest::run_constraint_manager_tests): Move call to
        test_constant_comparisons to outside the transitivity guard.
        * constraint-manager.h (struct bound): Move here from
        constraint-manager.cc.
        (struct range): Likewise.
        (struct::eval_condition): New decl.
        (struct::below_lower_bound): New decl.
        (struct::above_upper_bound): New decl.
        (equiv_class::add): Port from svalue_id to const svalue *.
        (equiv_class::del): Likewise.
        (equiv_class::get_representative): Likewise.
        (equiv_class::remap_svalue_ids): Drop.
        (equiv_class::m_cst_sid): Convert to..
        (equiv_class::m_cst_sval): ...this.
        (equiv_class::m_vars): Port from svalue_id to const svalue *.
        (constraint::bool implied_by): New decl.
        (fact_visitor::on_fact): Port from svalue_id to const svalue *.
        (constraint_manager::constraint_manager): Add mgr param.
        (constraint_manager::clone): Delete.
        (constraint_manager::maybe_get_constant): Delete.
        (constraint_manager::get_sid_for_constant): Delete.
        (constraint_manager::get_num_svalues): Delete.
        (constraint_manager::dump_to_pp): Add "multiline" param.
        (constraint_manager::get_equiv_class): Port from svalue_id to
        const svalue *.
        (constraint_manager::add_constraint):  Likewise.
        (constraint_manager::get_equiv_class_by_sid): Rename to...
        (constraint_manager::get_equiv_class_by_svalue): ...this, porting
        from svalue_id to const svalue *.
        (constraint_manager::add_unknown_constraint): New decl.
        (constraint_manager::get_or_add_equiv_class): Port from svalue_id
        to const svalue *.
        (constraint_manager::eval_condition): Likewise.  Add overloads.
        (constraint_manager::get_ec_bounds): New decl.
        (constraint_manager::purge): Convert to template.
        (constraint_manager::remap_svalue_ids): Delete.
        (constraint_manager::on_liveness_change): New decl.
        (constraint_manager::canonicalize): Drop param.
        (constraint_manager::clean_merger_input): Delete.
        (constraint_manager::m_mgr): New field.
        * diagnostic-manager.cc: Move includes of
        "analyzer/call-string.h" and "analyzer/program-point.h" to before
        "analyzer/region-model.h", and also include "analyzer/store.h"
        before it.
        (saved_diagnostic::saved_diagnostic): Add "sval" param.
        (diagnostic_manager::diagnostic_manager): Add engine param.
        (diagnostic_manager::add_diagnostic): Add "sval" param, passing it
        to saved_diagnostic ctor.  Update overload to pass NULL for it.
        (dedupe_winners::dedupe_winners): Add engine param.
        (dedupe_winners::add): Add "eg" param.  Pass m_engine to
        feasible_p.
        (dedupe_winner::m_engine): New field.
        (diagnostic_manager::emit_saved_diagnostics): Pass engine to
        dedupe_winners.  Pass &eg when adding candidates.  Pass svalue
        rather than tree to prune_path.  Use get_stmt_location to get
        primary location of diagnostic.
        (diagnostic_manager::emit_saved_diagnostic): Likewise.
        (get_any_origin): Drop.
        (state_change_event_creator::on_global_state_change): Pass NULL
        const svalue * rather than NULL_TREE trees to state_change_event
        ctor.
        (state_change_event_creator::on_state_change): Port from tree and
        svalue_id to const svalue *.
        (for_each_state_change): Port from svalue_id to const svalue *.
        (struct null_assignment_sm_context): New.
        (diagnostic_manager::add_events_for_eedge):  Add state change
        events for assignment to NULL.
        (diagnostic_manager::prune_path): Update param from tree to
        const svalue *.
        (diagnostic_manager::prune_for_sm_diagnostic): Port from tracking
        by tree to by const svalue *.
        * diagnostic-manager.h (saved_diagnostic::saved_diagnostic): Add sval
        param.
        (saved_diagnostic::m_sval): New field.
        (diagnostic_manager::diagnostic_manager): Add engine param.
        (diagnostic_manager::get_engine): New.
        (diagnostic_manager::add_diagnostic): Add "sval" param.
        (diagnostic_manager::prune_path): Likewise.
        (diagnostic_manager::prune_for_sm_diagnostic): New overload.
        (diagnostic_manager::m_eng): New field.
        * engine.cc: Move includes of "analyzer/call-string.h" and
        "analyzer/program-point.h" to before "analyzer/region-model.h",
        and also include "analyzer/store.h" before it.
        (impl_region_model_context::impl_region_model_context): Update for
        removal of m_change field.
        (impl_region_model_context::remap_svalue_ids): Delete.
        (impl_region_model_context::on_svalue_leak): New.
        (impl_region_model_context::on_svalue_purge): Delete.
        (impl_region_model_context::on_liveness_change): New.
        (impl_region_model_context::on_unknown_change): Update param
        from svalue_id to const svalue *.  Add is_mutable param.
        (setjmp_svalue::compare_fields): Delete.
        (setjmp_svalue::accept): New.
        (setjmp_svalue::add_to_hash): Delete.
        (setjmp_svalue::dump_to_pp): New.
        (setjmp_svalue::print_details): Delete.
        (impl_sm_context::impl_sm_context): Drop "change" param.
        (impl_sm_context::get_fndecl_for_call): Drop "m_change".
        (impl_sm_context::on_transition): Drop ATTRIBUTE_UNUSED from
        "stmt" param.  Drop m_change.  Port from svalue_id to
        const svalue *.
        (impl_sm_context::warn_for_state): Drop m_change.  Port from
        svalue_id to const svalue *.
        (impl_sm_context::get_readable_tree): Rename to...
        (impl_sm_context::get_diagnostic_tree): ...this.  Port from
        svalue_id to const svalue *.
        (impl_sm_context::is_zero_assignment): New.
        (impl_sm_context::m_change): Delete field.
        (leak_stmt_finder::find_stmt): Handle m_var being NULL.
        (readability):  Increase penalty for MEM_REF.  For SSA_NAMEs,
        slightly favor the underlying var over the SSA name.  Heavily
        penalize temporaries.  Handle RESULT_DECL.
        (readability_comparator): Make non-static.  Consider stack depths.
        (impl_region_model_context::on_state_leak): Convert from svalue_id
        to const svalue *, updating for region_model changes.  Use
        id_equal.
        (impl_region_model_context::on_inherited_svalue): Delete.
        (impl_region_model_context::on_cast): Delete.
        (impl_region_model_context::on_condition):  Drop m_change.
        (impl_region_model_context::on_phi): Likewise.
        (impl_region_model_context::on_unexpected_tree_code): Handle t
        being NULL.
        (point_and_state::validate): Update stack checking for
        region_model changes.
        (eg_traits::dump_args_t::show_enode_details_p): New.
        (exploded_node::exploded_node): Initialize m_num_processed_stmts.
        (exploded_node::get_processed_stmt): New function.
        (exploded_node::get_dot_fillcolor): Add more colors.
        (exploded_node::dump_dot): Guard the printing of the point and
        state with show_enode_details_p.  Print the processed stmts for
        this enode after the initial state.
        (exploded_node::dump_to_pp): Pass true for new multiline param
        of program_state::dump_to_pp.
        (exploded_node::on_stmt): Drop "change" param.  Log the stmt.
        Set input_location.  Implement __analyzer_describe.  Update
        implementation of __analyzer_dump and __analyzer_eval.
        Remove purging of sm-state for unknown fncalls from here.
        (exploded_node::on_edge): Drop "change" param.
        (exploded_node::on_longjmp): Port from region_id/svalue_id to
        const region */const svalue *.  Call program_state::detect_leaks.
        Drop state_change.
        (exploded_node::detect_leaks): Update for changes to region_model.
        Call program_state::detect_leaks.
        (exploded_edge::exploded_edge): Drop ext_state and change params.
        (exploded_edge::dump_dot): "args" is no longer used.  Drop dumping
        of m_change.
        (exploded_graph::exploded_graph): Pass engine to
        m_diagnostic_manager ctor.  Use program_point::origin.
        (exploded_graph::add_function_entry):  Drop ctxt.  Use
        program_state::push_frame.  Drop state_change.
        (exploded_graph::get_or_create_node): Drop "change" param.  Add
        "enode_for_diag" param.  Update dumping calls for API changes.
        Pass point to can_merge_with_p.  Show enode indices
        within -Wanalyzer-too-complex diagnostic for hitting the per-point
        limit.
        (exploded_graph::add_edge): Drop "change" param.  Log which nodes
        are being connected.  Update for changes to exploded_edge ctor.
        (exploded_graph::get_per_program_point_data): New.
        (exploded_graph::process_worklist): Pass point to
        can_merge_with_p.  Drop state_change.  Update dumping call for API
        change.
        (exploded_graph::process_node):  Drop state_change.  Split the
        node in-place if an sm-state-change occurs.  Update
        m_num_processed_stmts.  Update dumping calls for API change.
        (exploded_graph::log_stats): Call engine::log_stats.
        (exploded_graph::dump_states_for_supernode): Update dumping
        call.
        (exploded_path::feasible_p): Add "eng" and "eg" params.
        Rename "i" to "end_idx".  Pass the manager to the region_model
        ctor.  Update for every processed stmt in the enode, not just the
        first.  Keep track of which snodes have been visited, and call
        loop_replay_fixup when revisiting one.
        (enode_label::get_text): Update dump call for new param.
        (exploded_graph::dump_exploded_nodes): Likewise.
        (exploded_graph::get_node_by_index): New.
        (impl_run_checkers): Create engine instance and pass its address
        to extrinsic_state ctor.
        * exploded-graph.h
        (impl_region_model_context::impl_region_model_context): Drop
        "change" params.
        (impl_region_model_context::void remap_svalue_ids): Delete.
        (impl_region_model_context::on_svalue_purge): Delete.
        (impl_region_model_context::on_svalue_leak): New.
        (impl_region_model_context::on_liveness_change): New.
        (impl_region_model_context::on_state_leak): Update signature.
        (impl_region_model_context::on_inherited_svalue): Delete.
        (impl_region_model_context::on_cast): Delete.
        (impl_region_model_context::on_unknown_change): Update signature.
        (impl_region_model_context::m_change): Delete.
        (eg_traits::dump_args_t::show_enode_details_p): New.
        (exploded_node::on_stmt): Drop "change" param.
        (exploded_node::on_edge): Likewise.
        (exploded_node::get_processed_stmt): New decl.
        (exploded_node::m_num_processed_stmts): New field.
        (exploded_edge::exploded_edge): Drop ext_state and change params.
        (exploded_edge::m_change): Delete.
        (exploded_graph::get_engine): New accessor.
        (exploded_graph::get_or_create_node): Drop "change" param.  Add
        "enode_for_diag" param.
        (exploded_graph::add_edge): Drop "change" param.
        (exploded_graph::get_per_program_point_data): New decl.
        (exploded_graph::get_node_by_index): New decl.
        (exploded_path::feasible_p): Add "eng" and "eg" params.
        * program-point.cc: Include "analyzer/store.h" before including
        "analyzer/region-model.h".
        (function_point::function_point): Move here from
        program-point.h.
        (function_point::get_function): Likewise.
        (function_point::from_function_entry): Likewise.
        (function_point::before_supernode): Likewise.
        (function_point::next_stmt): New function.
        * program-point.h (function_point::function_point): Move
        implementation from here to program-point.cc.
        (function_point::get_function): Likewise.
        (function_point::from_function_entry): Likewise.
        (function_point::before_supernode): Likewise.
        (function_point::next_stmt): New decl.
        (program_point::operator!=): New.
        (program_point::origin): New.
        (program_point::next_stmt): New.
        (program_point::m_function_point): Make non-const.
        * program-state.cc: Move includes of "analyzer/call-string.h" and
        "analyzer/program-point.h" to before "analyzer/region-model.h",
        and also include "analyzer/store.h" before it.
        (extrinsic_state::get_model_manager): New.
        (sm_state_map::sm_state_map): Pass in sm and sm_idx to ctor,
        rather than pass the around.
        (sm_state_map::clone_with_remapping): Delete.
        (sm_state_map::print): Remove "sm" param in favor of "m_sm".  Add
        "simple" and "multiline" params and support multiline vs single
        line dumping.
        (sm_state_map::dump): Remove "sm" param in favor of "m_sm".  Add
        "simple" param.
        (sm_state_map::hash): Port from svalue_id to const svalue *.
        (sm_state_map::operator==): Likewise.
        (sm_state_map::get_state): Likewise.  Call canonicalize_svalue on
        input.  Handle inheritance of sm-state.  Call get_default_state.
        (sm_state_map::get_origin): Port from svalue_id to const svalue *.
        (sm_state_map::set_state): Likewise.  Pass in ext_state.  Reject
        attempts to set state on UNKNOWN.
        (sm_state_map::impl_set_state): Port from svalue_id to
        const svalue *.  Pass in ext_state.  Call canonicalize_svalue on
        input.
        (sm_state_map::purge_for_unknown_fncall): Delete.
        (sm_state_map::on_svalue_leak): New.
        (sm_state_map::remap_svalue_ids): Delete.
        (sm_state_map::on_liveness_change): New.
        (sm_state_map::on_unknown_change): Reimplement.
        (sm_state_map::on_svalue_purge): Delete.
        (sm_state_map::on_inherited_svalue): Delete.
        (sm_state_map::on_cast): Delete.
        (sm_state_map::validate): Delete.
        (sm_state_map::canonicalize_svalue): New.
        (program_state::program_state): Update to pass manager to
        region_model's ctor.  Constify num_states and pass state machine
        and index to sm_state_map ctor.
        (program_state::print): Update for changes to dump API.
        (program_state::dump_to_pp): Ignore the summarize param.  Add
        "multiline" param.
        (program_state::dump_to_file): Add "multiline" param.
        (program_state::dump): Pass "true" for new "multiline" param.
        (program_state::push_frame): New.
        (program_state::on_edge): Drop "change" param.  Call
        program_state::detect_leaks.
        (program_state::prune_for_point): Add enode_for_diag param.
        Reimplement based on store class.  Call detect_leaks
        (program_state::remap_svalue_ids): Delete.
        (program_state::get_representative_tree): Port from svalue_id to
        const svalue *.
        (program_state::can_merge_with_p): Add "point" param.  Add early
        reject for sm-differences.  Drop id remapping.
        (program_state::validate): Drop region model and sm_state_map
        validation.
        (state_change::sm_change::dump): Delete.
        (state_change::sm_change::remap_svalue_ids): Delete.
        (state_change::sm_change::on_svalue_purge): Delete.
        (log_set_of_svalues): New.
        (state_change::sm_change::validate): Delete.
        (state_change::state_change): Delete.
        (state_change::add_sm_change): Delete.
        (state_change::affects_p): Delete.
        (state_change::dump): Delete.
        (state_change::remap_svalue_ids): Delete.
        (state_change::on_svalue_purge): Delete.
        (state_change::validate): Delete.
        (selftest::assert_dump_eq): Delete.
        (ASSERT_DUMP_EQ): Delete.
        (selftest::test_sm_state_map): Update for changes to region_model
        and sm_state_map, porting from svalue_id to const svalue *.
        (selftest::test_program_state_dumping): Likewise.  Drop test of
        dumping, renaming to...
        (selftest::test_program_state_1): ...this.
        (selftest::test_program_state_dumping_2): Likewise, renaming to...
        (selftest::test_program_state_2): ...this.
        (selftest::test_program_state_merging): Update for changes to
        region_model.
        (selftest::test_program_state_merging_2): Likewise.
        (selftest::analyzer_program_state_cc_tests): Update for renamed
        tests.
        * program-state.h (extrinsic_state::extrinsic_state): Add logger
        and engine params.
        (extrinsic_state::get_logger): New accessor.
        (extrinsic_state::get_engine): New accessor.
        (extrinsic_state::get_model_manager): New accessor.
        (extrinsic_state::m_logger): New field.
        (extrinsic_state::m_engine): New field.
        (struct default_hash_traits<svalue_id>): Delete.
        (pod_hash_traits<svalue_id>::hash): Delete.
        (pod_hash_traits<svalue_id>::equal): Delete.
        (pod_hash_traits<svalue_id>::mark_deleted): Delete.
        (pod_hash_traits<svalue_id>::mark_empty): Delete.
        (pod_hash_traits<svalue_id>::is_deleted): Delete.
        (pod_hash_traits<svalue_id>::is_empty): Delete.
        (sm_state_map::entry_t::entry_t): Port from svalue_id to
        const svalue *.
        (sm_state_map::entry_t::m_origin): Likewise.
        (sm_state_map::map_t): Likewise.
        (sm_state_map::sm_state_map): Add state_machine and index params.
        (sm_state_map::clone_with_remapping): Delete.
        (sm_state_map::print):  Drop sm param; add simple and multiline
        params.
        (sm_state_map::dump): Drop sm param; add simple param.
        (sm_state_map::get_state): Port from svalue_id to const svalue *.
        Add ext_state param.
        (sm_state_map::get_origin): Likewise.
        (sm_state_map::set_state): Likewise.
        (sm_state_map::impl_set_state): Likewise.
        (sm_state_map::purge_for_unknown_fncall): Delete.
        (sm_state_map::remap_svalue_ids): Delete.
        (sm_state_map::on_svalue_purge): Delete.
        (sm_state_map::on_svalue_leak): New.
        (sm_state_map::on_liveness_change): New.
        (sm_state_map::on_inherited_svalue): Delete.
        (sm_state_map::on_cast): Delete.
        (sm_state_map::validate): Delete.
        (sm_state_map::on_unknown_change): Port from svalue_id to
        const svalue *.  Add is_mutable and ext_state params.
        (sm_state_map::canonicalize_svalue): New.
        (sm_state_map::m_sm): New field.
        (sm_state_map::m_sm_idx): New field.
        (program_state::operator=): Delete.
        (program_state::dump_to_pp): Drop "summarize" param, adding
        "simple" and "multiline".
        (program_state::dump_to_file): Likewise.
        (program_state::dump): Rename "summarize" to "simple".
        (program_state::push_frame): New.
        (program_state::get_current_function): New.
        (program_state::on_edge): Drop "change" param.
        (program_state::prune_for_point): Likewise.  Add enode_for_diag
        param.
        (program_state::remap_svalue_ids): Delete.
        (program_state::get_representative_tree): Port from svalue_id to
        const svalue *.
        (program_state::can_purge_p): Likewise.  Pass ext_state to get_state.
        (program_state::can_merge_with_p): Add point param.
        (program_state::detect_leaks): New.
        (state_change_visitor::on_state_change): Port from tree and
        svalue_id to a pair of const svalue *.
        (class state_change): Delete.
        * region.cc: New file.
        * region-model-impl-calls.cc: New file.
        * region-model-manager.cc: New file.
        * region-model-reachability.cc: New file.
        * region-model-reachability.h: New file.
        * region-model.cc: Include "analyzer/call-string.h",
        "analyzer/program-point.h", and "analyzer/store.h" before
        "analyzer/region-model.h".  Include
        "analyzer/region-model-reachability.h".
        (dump_tree): Make non-static.
        (dump_quoted_tree): Make non-static.
        (print_quoted_type): Make non-static.
        (path_var::dump): Delete.
        (dump_separator): Delete.
        (class impl_constraint_manager): Delete.
        (svalue_id::print): Delete.
        (svalue_id::dump_node_name_to_pp): Delete.
        (svalue_id::validate): Delete.
        (region_id::print): Delete.
        (region_id::dump_node_name_to_pp): Delete.
        (region_id::validate): Delete.
        (region_id_set::region_id_set): Delete.
        (svalue_id_set::svalue_id_set): Delete.
        (svalue::operator==): Delete.
        (svalue::hash): Delete.
        (svalue::print): Delete.
        (svalue::dump_dot_to_pp): Delete.
        (svalue::remap_region_ids): Delete.
        (svalue::walk_for_canonicalization): Delete.
        (svalue::get_child_sid): Delete.
        (svalue::maybe_get_constant): Delete.
        (region_svalue::compare_fields): Delete.
        (region_svalue::add_to_hash): Delete.
        (region_svalue::print_details): Delete.
        (region_svalue::dump_dot_to_pp): Delete.
        (region_svalue::remap_region_ids): Delete.
        (region_svalue::merge_values): Delete.
        (region_svalue::walk_for_canonicalization): Delete.
        (region_svalue::eval_condition): Delete.
        (constant_svalue::compare_fields): Delete.
        (constant_svalue::add_to_hash): Delete.
        (constant_svalue::merge_values): Delete.
        (constant_svalue::eval_condition): Move to svalue.cc.
        (constant_svalue::print_details): Delete.
        (constant_svalue::get_child_sid): Delete.
        (unknown_svalue::compare_fields): Delete.
        (unknown_svalue::add_to_hash): Delete.
        (unknown_svalue::print_details): Delete.
        (poison_kind_to_str): Move to svalue.cc.
        (poisoned_svalue::compare_fields): Delete.
        (poisoned_svalue::add_to_hash): Delete.
        (poisoned_svalue::print_details): Delete.
        (region_kind_to_str): Move to region.cc and reimplement.
        (region::operator==): Delete.
        (region::get_parent_region): Delete.
        (region::set_value): Delete.
        (region::become_active_view): Delete.
        (region::deactivate_any_active_view): Delete.
        (region::deactivate_view): Delete.
        (region::get_value): Delete.
        (region::get_inherited_child_sid): Delete.
        (region_model::copy_region): Delete.
        (region_model::copy_struct_region): Delete.
        (region_model::copy_union_region): Delete.
        (region_model::copy_array_region): Delete.
        (region::hash): Delete.
        (region::print): Delete.
        (region::dump_dot_to_pp): Delete.
        (region::dump_to_pp): Delete.
        (region::dump_child_label): Delete.
        (region::validate): Delete.
        (region::remap_svalue_ids): Delete.
        (region::remap_region_ids): Delete.
        (region::add_view): Delete.
        (region::get_view): Delete.
        (region::region): Move to region.cc.
        (region::add_to_hash): Delete.
        (region::print_fields): Delete.
        (region::non_null_p): Delete.
        (primitive_region::clone): Delete.
        (primitive_region::walk_for_canonicalization): Delete.
        (map_region::map_region): Delete.
        (map_region::compare_fields): Delete.
        (map_region::print_fields): Delete.
        (map_region::validate): Delete.
        (map_region::dump_dot_to_pp): Delete.
        (map_region::dump_child_label): Delete.
        (map_region::get_or_create): Delete.
        (map_region::get): Delete.
        (map_region::add_to_hash): Delete.
        (map_region::remap_region_ids): Delete.
        (map_region::unbind): Delete.
        (map_region::get_tree_for_child_region): Delete.
        (map_region::get_tree_for_child_region): Delete.
        (tree_cmp): Move to region.cc.
        (map_region::can_merge_p): Delete.
        (map_region::walk_for_canonicalization): Delete.
        (map_region::get_value_by_name): Delete.
        (struct_or_union_region::valid_key_p): Delete.
        (struct_or_union_region::compare_fields): Delete.
        (struct_region::clone): Delete.
        (struct_region::compare_fields): Delete.
        (union_region::clone): Delete.
        (union_region::compare_fields): Delete.
        (frame_region::compare_fields): Delete.
        (frame_region::clone): Delete.
        (frame_region::valid_key_p): Delete.
        (frame_region::print_fields): Delete.
        (frame_region::add_to_hash): Delete.
        (globals_region::compare_fields): Delete.
        (globals_region::clone): Delete.
        (globals_region::valid_key_p): Delete.
        (code_region::compare_fields): Delete.
        (code_region::clone): Delete.
        (code_region::valid_key_p): Delete.
        (array_region::array_region): Delete.
        (array_region::get_element): Delete.
        (array_region::clone): Delete.
        (array_region::compare_fields): Delete.
        (array_region::print_fields): Delete.
        (array_region::validate): Delete.
        (array_region::dump_dot_to_pp): Delete.
        (array_region::dump_child_label): Delete.
        (array_region::get_or_create): Delete.
        (array_region::get): Delete.
        (array_region::add_to_hash): Delete.
        (array_region::remap_region_ids): Delete.
        (array_region::get_key_for_child_region): Delete.
        (array_region::key_cmp): Delete.
        (array_region::walk_for_canonicalization): Delete.
        (array_region::key_from_constant): Delete.
        (array_region::constant_from_key): Delete.
        (function_region::compare_fields): Delete.
        (function_region::clone): Delete.
        (function_region::valid_key_p): Delete.
        (stack_region::stack_region): Delete.
        (stack_region::compare_fields): Delete.
        (stack_region::clone): Delete.
        (stack_region::print_fields): Delete.
        (stack_region::dump_child_label): Delete.
        (stack_region::validate): Delete.
        (stack_region::push_frame): Delete.
        (stack_region::get_current_frame_id): Delete.
        (stack_region::pop_frame): Delete.
        (stack_region::add_to_hash): Delete.
        (stack_region::remap_region_ids): Delete.
        (stack_region::can_merge_p): Delete.
        (stack_region::walk_for_canonicalization): Delete.
        (stack_region::get_value_by_name): Delete.
        (heap_region::heap_region): Delete.
        (heap_region::compare_fields): Delete.
        (heap_region::clone): Delete.
        (heap_region::walk_for_canonicalization): Delete.
        (root_region::root_region): Delete.
        (root_region::compare_fields): Delete.
        (root_region::clone): Delete.
        (root_region::print_fields): Delete.
        (root_region::validate): Delete.
        (root_region::dump_child_label): Delete.
        (root_region::push_frame): Delete.
        (root_region::get_current_frame_id): Delete.
        (root_region::pop_frame): Delete.
        (root_region::ensure_stack_region): Delete.
        (root_region::get_stack_region): Delete.
        (root_region::ensure_globals_region): Delete.
        (root_region::get_code_region): Delete.
        (root_region::ensure_code_region): Delete.
        (root_region::get_globals_region): Delete.
        (root_region::ensure_heap_region): Delete.
        (root_region::get_heap_region): Delete.
        (root_region::remap_region_ids): Delete.
        (root_region::can_merge_p): Delete.
        (root_region::add_to_hash): Delete.
        (root_region::walk_for_canonicalization): Delete.
        (root_region::get_value_by_name): Delete.
        (symbolic_region::symbolic_region): Delete.
        (symbolic_region::compare_fields): Delete.
        (symbolic_region::clone): Delete.
        (symbolic_region::walk_for_canonicalization): Delete.
        (symbolic_region::print_fields): Delete.
        (region_model::region_model): Add region_model_manager * param.
        Reimplement in terms of store, dropping impl_constraint_manager
        subclass.
        (region_model::operator=): Reimplement in terms of store
        (region_model::operator==): Likewise.
        (region_model::hash): Likewise.
        (region_model::print): Delete.
        (region_model::print_svalue): Delete.
        (region_model::dump_dot_to_pp): Delete.
        (region_model::dump_dot_to_file): Delete.
        (region_model::dump_dot): Delete.
        (region_model::dump_to_pp): Replace "summarize" param with
        "simple" and "multiline".  Port to store-based implementation.
        (region_model::dump): Replace "summarize" param with "simple" and
        "multiline".
        (dump_vec_of_tree): Delete.
        (region_model::dump_summary_of_rep_path_vars): Delete.
        (region_model::validate): Delete.
        (svalue_id_cmp_by_constant_svalue_model): Delete.
        (svalue_id_cmp_by_constant_svalue): Delete.
        (region_model::canonicalize): Drop "ctxt" param.  Reimplement in
        terms of store and constraints.
        (region_model::canonicalized_p): Remove NULL arg to canonicalize.
        (region_model::loop_replay_fixup): New.
        (poisoned_value_diagnostic::emit): Tweak wording of warnings.
        (region_model::check_for_poison): Delete.
        (region_model::get_gassign_result): New.
        (region_model::on_assignment): Port to store-based implementation.
        (region_model::on_call_pre): Delete calls to check_for_poison.
        Move implementations to region-model-impl-calls.c and port to
        store-based implementation.
        (region_model::on_call_post): Likewise.
        (class reachable_regions): Move to region-model-reachability.h/cc
        and port to store-based implementation.
        (region_model::handle_unrecognized_call): Port to store-based
        implementation.
        (region_model::get_reachable_svalues): New.
        (region_model::on_setjmp): Port to store-based implementation.
        (region_model::on_longjmp): Likewise.
        (region_model::handle_phi): Drop is_back_edge param and the logic
        using it.
        (region_model::get_lvalue_1): Port from region_id to const region *.
        (region_model::make_region_for_unexpected_tree_code): Delete.
        (assert_compat_types): If the check fails, use internal_error to
        show the types.
        (region_model::get_lvalue): Port from region_id to const region *.
        (region_model::get_rvalue_1): Port from svalue_id to const svalue *.
        (region_model::get_rvalue): Likewise.
        (region_model::get_or_create_ptr_svalue): Delete.
        (region_model::get_or_create_constant_svalue): Delete.
        (region_model::get_svalue_for_fndecl): Delete.
        (region_model::get_region_for_fndecl): Delete.
        (region_model::get_svalue_for_label): Delete.
        (region_model::get_region_for_label): Delete.
        (build_cast): Delete.
        (region_model::maybe_cast_1): Delete.
        (region_model::maybe_cast): Delete.
        (region_model::get_field_region): Delete.
        (region_model::get_store_value): New.
        (region_model::region_exists_p): New.
        (region_model::deref_rvalue): Port from svalue_id to const svalue *.
        (region_model::set_value): Likewise.
        (region_model::clobber_region): New.
        (region_model::purge_region): New.
        (region_model::zero_fill_region): New.
        (region_model::mark_region_as_unknown): New.
        (region_model::eval_condition): Port from svalue_id to
        const svalue *.
        (region_model::eval_condition_without_cm): Likewise.
        (region_model::compare_initial_and_pointer): New.
        (region_model::add_constraint): Port from svalue_id to
        const svalue *.
        (region_model::maybe_get_constant): Delete.
        (region_model::get_representative_path_var): New.
        (region_model::add_new_malloc_region): Delete.
        (region_model::get_representative_tree): Port to const svalue *.
        (region_model::get_representative_path_var): Port to
        const region *.
        (region_model::get_path_vars_for_svalue): Delete.
        (region_model::set_to_new_unknown_value): Delete.
        (region_model::update_for_phis): Don't pass is_back_edge to handle_phi.
        (region_model::update_for_call_superedge): Port from svalue_id to
        const svalue *.
        (region_model::update_for_return_superedge): Port to store-based
        implementation.
        (region_model::update_for_call_summary): Replace
        set_to_new_unknown_value with mark_region_as_unknown.
        (region_model::get_root_region): Delete.
        (region_model::get_stack_region_id): Delete.
        (region_model::push_frame): Delete.
        (region_model::get_current_frame_id): Delete.
        (region_model::get_current_function): Delete.
        (region_model::pop_frame): Delete.
        (region_model::on_top_level_param): New.
        (region_model::get_stack_depth): Delete.
        (region_model::get_function_at_depth): Delete.
        (region_model::get_globals_region_id): Delete.
        (region_model::add_svalue): Delete.
        (region_model::replace_svalue): Delete.
        (region_model::add_region): Delete.
        (region_model::get_svalue): Delete.
        (region_model::get_region): Delete.
        (make_region_for_type): Delete.
        (region_model::add_region_for_type): Delete.
        (region_model::on_top_level_param): New.
        (class restrict_to_used_svalues): Delete.
        (region_model::purge_unused_svalues): Delete.
        (region_model::push_frame): New.
        (region_model::remap_svalue_ids): Delete.
        (region_model::remap_region_ids): Delete.
        (region_model::purge_regions): Delete.
        (region_model::get_descendents): Delete.
        (region_model::delete_region_and_descendents): Delete.
        (region_model::poison_any_pointers_to_bad_regions): Delete.
        (region_model::can_merge_with_p): Delete.
        (region_model::get_current_function): New.
        (region_model::get_value_by_name): Delete.
        (region_model::convert_byte_offset_to_array_index): Delete.
        (region_model::pop_frame): New.
        (region_model::get_or_create_mem_ref): Delete.
        (region_model::get_stack_depth): New.
        (region_model::get_frame_at_index): New.
        (region_model::unbind_region_and_descendents): New.
        (struct bad_pointer_finder): New.
        (region_model::get_or_create_pointer_plus_expr): Delete.
        (region_model::poison_any_pointers_to_descendents): New.
        (region_model::get_or_create_view): Delete.
        (region_model::can_merge_with_p): New.
        (region_model::get_fndecl_for_call):  Port from svalue_id to
        const svalue *.
        (struct append_ssa_names_cb_data): New.
        (get_ssa_name_regions_for_current_frame): New.
        (region_model::append_ssa_names_cb): New.
        (model_merger::dump_to_pp): Add "simple" param.  Drop dumping of
        remappings.
        (model_merger::dump): Add "simple" param to both overloads.
        (model_merger::can_merge_values_p): Delete.
        (model_merger::record_regions): Delete.
        (model_merger::record_svalues): Delete.
        (svalue_id_merger_mapping::svalue_id_merger_mapping): Delete.
        (svalue_id_merger_mapping::dump_to_pp): Delete.
        (svalue_id_merger_mapping::dump): Delete.
        (region_model::create_region_for_heap_alloc): New.
        (region_model::create_region_for_alloca): New.
        (region_model::record_dynamic_extents): New.
        (canonicalization::canonicalization): Delete.
        (canonicalization::walk_rid): Delete.
        (canonicalization::walk_sid): Delete.
        (canonicalization::dump_to_pp): Delete.
        (canonicalization::dump): Delete.
        (inchash::add): Delete overloads for svalue_id and region_id.
        (engine::log_stats): New.
        (assert_condition): Add overload comparing svalues.
        (assert_dump_eq): Pass "true" for multiline.
        (selftest::test_dump): Update for rewrite of region_model.
        (selftest::test_dump_2): Rename to...
        (selftest::test_struct): ...this.  Provide a region_model_manager
        when creating region_model instance.  Remove dump test.  Add
        checks for get_offset.
        (selftest::test_dump_3): Rename to...
        (selftest::test_array_1): ...this.  Provide a region_model_manager
        when creating region_model instance.  Remove dump test.
        (selftest::test_get_representative_tree): Port from svalue_id to
        new API.  Add test coverage for various expressions.
        (selftest::test_unique_constants): Provide a region_model_manager
        for the region_model.  Add test coverage for comparing const vs
        non-const.
        (selftest::test_svalue_equality): Delete.
        (selftest::test_region_equality): Delete.
        (selftest::test_unique_unknowns): New.
        (class purge_all_svalue_ids): Delete.
        (class purge_one_svalue_id): Delete.
        (selftest::test_purging_by_criteria): Delete.
        (selftest::test_initial_svalue_folding): New.
        (selftest::test_unaryop_svalue_folding): New.
        (selftest::test_binop_svalue_folding): New.
        (selftest::test_sub_svalue_folding): New.
        (selftest::test_purge_unused_svalues): Delete.
        (selftest::test_descendent_of_p): New.
        (selftest::test_assignment): Provide a region_model_manager for
        the region_model.  Drop the dump test.
        (selftest::test_compound_assignment): Likewise.
        (selftest::test_stack_frames): Port to new implementation.
        (selftest::test_get_representative_path_var): Likewise.
        (selftest::test_canonicalization_1): Rename to...
        (selftest::test_equality_1): ...this.  Port to new API, and add
        (selftest::test_canonicalization_2): Provide a
        region_model_manager when creating region_model instances.
        Remove redundant canicalization.
        (selftest::test_canonicalization_3): Provide a
        region_model_manager when creating region_model instances.
        Remove param from calls to region_model::canonicalize.
        (selftest::test_canonicalization_4): Likewise.
        (selftest::assert_region_models_merge): Constify
        out_merged_svalue.  Port to new API.
        (selftest::test_state_merging): Provide a
        region_model_manager when creating region_model instances.
        Provide a program_point point when merging them.  Replace
        set_to_new_unknown_value with usage of placeholder_svalues.
        Drop get_value_by_name.  Port from svalue_id to const svalue *.
        Add test of heap allocation.
        (selftest::test_constraint_merging):  Provide a
        region_model_manager when creating region_model instances.
        Provide a program_point point when merging them.  Eliminate use
        of set_to_new_unknown_value.
        (selftest::test_widening_constraints): New.
        (selftest::test_iteration_1): New.
        (selftest::test_malloc_constraints): Port to store-based
        implementation.
        (selftest::test_var): New test.
        (selftest::test_array_2): New test.
        (selftest::test_mem_ref): New test.
        (selftest::test_POINTER_PLUS_EXPR_then_MEM_REF): New.
        (selftest::test_malloc): New.
        (selftest::test_alloca): New.
        (selftest::analyzer_region_model_cc_tests): Update for renamings.
        Call new functions.
        * region-model.h (class path_var): Move to analyzer.h.
        (class svalue_id): Delete.
        (class region_id): Delete.
        (class id_map): Delete.
        (svalue_id_map): Delete.
        (region_id_map): Delete.
        (id_map<T>::id_map): Delete.
        (id_map<T>::put): Delete.
        (id_map<T>::get_dst_for_src): Delete.
        (id_map<T>::get_src_for_dst): Delete.
        (id_map<T>::dump_to_pp): Delete.
        (id_map<T>::dump): Delete.
        (id_map<T>::update): Delete.
        (one_way_svalue_id_map): Delete.
        (one_way_region_id_map): Delete.
        (class region_id_set): Delete.
        (class svalue_id_set): Delete.
        (struct complexity): New.
        (class visitor): New.
        (enum svalue_kind): Add SK_SETJMP, SK_INITIAL, SK_UNARYOP,
        SK_BINOP, SK_SUB,SK_UNMERGEABLE, SK_PLACEHOLDER, SK_WIDENING,
        SK_COMPOUND, and SK_CONJURED.
        (svalue::operator==): Delete.
        (svalue::operator!=): Delete.
        (svalue::clone): Delete.
        (svalue::hash): Delete.
        (svalue::dump_dot_to_pp): Delete.
        (svalue::dump_to_pp): New.
        (svalue::dump): New.
        (svalue::get_desc): New.
        (svalue::dyn_cast_initial_svalue): New.
        (svalue::dyn_cast_unaryop_svalue): New.
        (svalue::dyn_cast_binop_svalue): New.
        (svalue::dyn_cast_sub_svalue): New.
        (svalue::dyn_cast_unmergeable_svalue): New.
        (svalue::dyn_cast_widening_svalue): New.
        (svalue::dyn_cast_compound_svalue): New.
        (svalue::dyn_cast_conjured_svalue): New.
        (svalue::maybe_undo_cast): New.
        (svalue::unwrap_any_unmergeable): New.
        (svalue::remap_region_ids): Delete
        (svalue::can_merge_p): New.
        (svalue::walk_for_canonicalization): Delete
        (svalue::get_complexity): New.
        (svalue::get_child_sid): Delete
        (svalue::accept): New.
        (svalue::live_p): New.
        (svalue::implicitly_live_p): New.
        (svalue::svalue): Add complexity param.
        (svalue::add_to_hash): Delete
        (svalue::print_details): Delete
        (svalue::m_complexity): New field.
        (region_svalue::key_t): New struct.
        (region_svalue::region_svalue): Port from region_id to
        const region_id *.  Add complexity.
        (region_svalue::compare_fields): Delete.
        (region_svalue::clone): Delete.
        (region_svalue::dump_dot_to_pp): Delete.
        (region_svalue::get_pointee): Port from region_id to
        const region_id *.
        (region_svalue::remap_region_ids): Delete.
        (region_svalue::merge_values): Delete.
        (region_svalue::dump_to_pp): New.
        (region_svalue::accept): New.
        (region_svalue::walk_for_canonicalization): Delete.
        (region_svalue::eval_condition): Make params const.
        (region_svalue::add_to_hash): Delete.
        (region_svalue::print_details): Delete.
        (region_svalue::m_rid): Replace with...
        (region_svalue::m_reg): ...this.
        (is_a_helper <region_svalue *>::test): Convert to...
        (is_a_helper <const region_svalue *>::test): ...this.
        (template <> struct default_hash_traits<region_svalue::key_t>):
        New.
        (constant_svalue::constant_svalue): Add complexity.
        (constant_svalue::compare_fields): Delete.
        (constant_svalue::clone): Delete.
        (constant_svalue::add_to_hash): Delete.
        (constant_svalue::dump_to_pp): New.
        (constant_svalue::accept): New.
        (constant_svalue::implicitly_live_p): New.
        (constant_svalue::merge_values): Delete.
        (constant_svalue::eval_condition): Make params const.
        (constant_svalue::get_child_sid): Delete.
        (constant_svalue::print_details): Delete.
        (is_a_helper <constant_svalue *>::test): Convert to...
        (is_a_helper <const constant_svalue *>::test): ...this.
        (class unknown_svalue): Update leading comment.
        (unknown_svalue::unknown_svalue): Add complexity.
        (unknown_svalue::compare_fields): Delete.
        (unknown_svalue::add_to_hash): Delete.
        (unknown_svalue::dyn_cast_unknown_svalue): Delete.
        (unknown_svalue::print_details): Delete.
        (unknown_svalue::dump_to_pp): New.
        (unknown_svalue::accept): New.
        (poisoned_svalue::key_t): New struct.
        (poisoned_svalue::poisoned_svalue): Add complexity.
        (poisoned_svalue::compare_fields): Delete.
        (poisoned_svalue::clone): Delete.
        (poisoned_svalue::add_to_hash): Delete.
        (poisoned_svalue::dump_to_pp): New.
        (poisoned_svalue::accept): New.
        (poisoned_svalue::print_details): Delete.
        (is_a_helper <poisoned_svalue *>::test): Convert to...
        (is_a_helper <const poisoned_svalue *>::test): ...this.
        (template <> struct default_hash_traits<poisoned_svalue::key_t>):
        New.
        (setjmp_record::add_to_hash): New.
        (setjmp_svalue::key_t): New struct.
        (setjmp_svalue::compare_fields): Delete.
        (setjmp_svalue::clone): Delete.
        (setjmp_svalue::add_to_hash): Delete.
        (setjmp_svalue::setjmp_svalue): Add complexity.
        (setjmp_svalue::dump_to_pp): New.
        (setjmp_svalue::accept): New.
        (setjmp_svalue::void print_details): Delete.
        (is_a_helper <const setjmp_svalue *>::test): New.
        (template <> struct default_hash_traits<setjmp_svalue::key_t>): New.
        (class initial_svalue : public svalue): New.
        (is_a_helper <const initial_svalue *>::test): New.
        (class unaryop_svalue): New.
        (is_a_helper <const unaryop_svalue *>::test): New.
        (template <> struct default_hash_traits<unaryop_svalue::key_t>): New.
        (class binop_svalue): New.
        (is_a_helper <const binop_svalue *>::test): New.
        (template <> struct default_hash_traits<binop_svalue::key_t>): New.
        (class sub_svalue): New.
        (is_a_helper <const sub_svalue *>::test): New.
        (template <> struct default_hash_traits<sub_svalue::key_t>): New.
        (class unmergeable_svalue): New.
        (is_a_helper <const unmergeable_svalue *>::test): New.
        (class placeholder_svalue): New.
        (is_a_helper <placeholder_svalue *>::test): New.
        (class widening_svalue): New.
        (is_a_helper <widening_svalue *>::test): New.
        (template <> struct default_hash_traits<widening_svalue::key_t>): New.
        (class compound_svalue): New.
        (is_a_helper <compound_svalue *>::test): New.
        (template <> struct default_hash_traits<compound_svalue::key_t>): New.
        (class conjured_svalue): New.
        (is_a_helper <conjured_svalue *>::test): New.
        (template <> struct default_hash_traits<conjured_svalue::key_t>): New.
        (enum region_kind): Delete RK_PRIMITIVE, RK_STRUCT, RK_UNION, and
        RK_ARRAY.  Add RK_LABEL, RK_DECL, RK_FIELD, RK_ELEMENT, RK_OFFSET,
        RK_CAST, RK_HEAP_ALLOCATED, RK_ALLOCA, RK_STRING, and RK_UNKNOWN.
        (region_kind_to_str): Delete.
        (region::~region): Move implementation to region.cc.
        (region::operator==): Delete.
        (region::operator!=): Delete.
        (region::clone): Delete.
        (region::get_id): New.
        (region::cmp_ids): New.
        (region::dyn_cast_map_region): Delete.
        (region::dyn_cast_array_region): Delete.
        (region::region_id get_parent): Delete.
        (region::get_parent_region): Convert to a simple accessor.
        (region::void set_value): Delete.
        (region::svalue_id get_value): Delete.
        (region::svalue_id get_value_direct): Delete.
        (region::svalue_id get_inherited_child_sid): Delete.
        (region::dyn_cast_frame_region): New.
        (region::dyn_cast_function_region): New.
        (region::dyn_cast_decl_region): New.
        (region::dyn_cast_field_region): New.
        (region::dyn_cast_element_region): New.
        (region::dyn_cast_offset_region): New.
        (region::dyn_cast_cast_region): New.
        (region::dyn_cast_string_region): New.
        (region::accept): New.
        (region::get_base_region): New.
        (region::base_region_p): New.
        (region::descendent_of_p): New.
        (region::maybe_get_frame_region): New.
        (region::maybe_get_decl): New.
        (region::hash): Delete.
        (region::rint): Delete.
        (region::dump_dot_to_pp): Delete.
        (region::get_desc): New.
        (region::dump_to_pp): Convert to vfunc, changing signature.
        (region::dump_child_label): Delete.
        (region::remap_svalue_ids): Delete.
        (region::remap_region_ids): Delete.
        (region::dump): New.
        (region::walk_for_canonicalization): Delete.
        (region::non_null_p): Drop region_model param.
        (region::add_view): Delete.
        (region::get_view): Delete.
        (region::get_active_view): Delete.
        (region::is_view_p): Delete.
        (region::cmp_ptrs): New.
        (region::validate): Delete.
        (region::get_offset): New.
        (region::get_byte_size): New.
        (region::get_bit_size): New.
        (region::get_subregions_for_binding): New.
        (region::region): Add complexity param.  Convert parent from
        region_id to const region *.  Drop svalue_id.  Drop copy ctor.
        (region::symbolic_for_unknown_ptr_p): New.
        (region::add_to_hash): Delete.
        (region::print_fields): Delete.
        (region::get_complexity): New accessor.
        (region::become_active_view): Delete.
        (region::deactivate_any_active_view): Delete.
        (region::deactivate_view): Delete.
        (region::calc_offset): New.
        (region::m_parent_rid): Delete.
        (region::m_sval_id): Delete.
        (region::m_complexity): New.
        (region::m_id): New.
        (region::m_parent): New.
        (region::m_view_rids): Delete.
        (region::m_is_view): Delete.
        (region::m_active_view_rid): Delete.
        (region::m_cached_offset): New.
        (is_a_helper <region *>::test): Convert to...
        (is_a_helper <const region *>::test): ... this.
        (class primitive_region): Delete.
        (class space_region): New.
        (class map_region): Delete.
        (is_a_helper <map_region *>::test): Delete.
        (class frame_region): Reimplement.
        (template <> struct default_hash_traits<frame_region::key_t>):
        New.
        (class globals_region): Reimplement.
        (is_a_helper <globals_region *>::test): Convert to...
        (is_a_helper <const globals_region *>::test): ...this.
        (class struct_or_union_region): Delete.
        (is_a_helper <struct_or_union_region *>::test): Delete.
        (class code_region): Reimplement.
        (is_a_helper <const code_region *>::test): New.
        (class struct_region): Delete.
        (is_a_helper <struct_region *>::test): Delete.
        (class function_region): Reimplement.
        (is_a_helper <function_region *>::test): Convert to...
        (is_a_helper <const function_region *>::test): ...this.
        (class union_region): Delete.
        (is_a_helper <union_region *>::test): Delete.
        (class label_region): New.
        (is_a_helper <const label_region *>::test): New.
        (class scope_region): Delete.
        (class stack_region): Reimplement.
        (is_a_helper <stack_region *>::test): Convert to...
        (is_a_helper <const stack_region *>::test): ...this.
        (class heap_region): Reimplement.
        (is_a_helper <heap_region *>::test): Convert to...
        (is_a_helper <const heap_region *>::test): ...this.
        (class root_region): Reimplement.
        (is_a_helper <root_region *>::test): Convert to...
        (is_a_helper <const root_region *>::test): ...this.
        (class symbolic_region): Reimplement.
        (is_a_helper <const symbolic_region *>::test): New.
        (template <> struct default_hash_traits<symbolic_region::key_t>):
        New.
        (class decl_region): New.
        (is_a_helper <const decl_region *>::test): New.
        (class field_region): New.
        (template <> struct default_hash_traits<field_region::key_t>): New.
        (class array_region): Delete.
        (class element_region): New.
        (is_a_helper <array_region *>::test): Delete.
        (is_a_helper <const element_region *>::test): New.
        (template <> struct default_hash_traits<element_region::key_t>):
        New.
        (class offset_region): New.
        (is_a_helper <const offset_region *>::test): New.
        (template <> struct default_hash_traits<offset_region::key_t>):
        New.
        (class cast_region): New.
        (is_a_helper <const cast_region *>::test): New.
        (template <> struct default_hash_traits<cast_region::key_t>): New.
        (class heap_allocated_region): New.
        (class alloca_region): New.
        (class string_region): New.
        (is_a_helper <const string_region *>::test): New.
        (class unknown_region): New.
        (class region_model_manager): New.
        (struct append_ssa_names_cb_data): New.
        (class call_details): New.
        (region_model::region_model): Add region_model_manager param.
        (region_model::print_svalue): Delete.
        (region_model::dump_dot_to_pp): Delete.
        (region_model::dump_dot_to_file): Delete.
        (region_model::dump_dot): Delete.
        (region_model::dump_to_pp): Drop summarize param in favor of
        simple and multiline.
        (region_model::dump): Likewise.
        (region_model::summarize_to_pp): Delete.
        (region_model::summarize): Delete.
        (region_model::void canonicalize): Drop ctxt param.
        (region_model::void check_for_poison): Delete.
        (region_model::get_gassign_result): New.
        (region_model::impl_call_alloca): New.
        (region_model::impl_call_analyzer_describe): New.
        (region_model::impl_call_analyzer_eval): New.
        (region_model::impl_call_builtin_expect): New.
        (region_model::impl_call_calloc): New.
        (region_model::impl_call_free): New.
        (region_model::impl_call_malloc): New.
        (region_model::impl_call_memset): New.
        (region_model::impl_call_strlen): New.
        (region_model::get_reachable_svalues): New.
        (region_model::handle_phi): Drop is_back_edge param.
        (region_model::region_id get_root_rid): Delete.
        (region_model::root_region *get_root_region): Delete.
        (region_model::region_id get_stack_region_id): Delete.
        (region_model::push_frame): Convert from region_id and svalue_id
        to const region * and const svalue *.
        (region_model::get_current_frame_id): Replace with...
        (region_model::get_current_frame): ...this.
        (region_model::pop_frame): Convert from region_id to
        const region *.  Drop purge and stats param.  Add out_result.
        (region_model::function *get_function_at_depth): Delete.
        (region_model::get_globals_region_id): Delete.
        (region_model::add_svalue): Delete.
        (region_model::replace_svalue): Delete.
        (region_model::add_region): Delete.
        (region_model::add_region_for_type): Delete.
        (region_model::get_svalue): Delete.
        (region_model::get_region): Delete.
        (region_model::get_lvalue): Convert from region_id to
        const region *.
        (region_model::get_rvalue): Convert from svalue_id to
        const svalue *.
        (region_model::get_or_create_ptr_svalue): Delete.
        (region_model::get_or_create_constant_svalue): Delete.
        (region_model::get_svalue_for_fndecl): Delete.
        (region_model::get_svalue_for_label): Delete.
        (region_model::get_region_for_fndecl): Delete.
        (region_model::get_region_for_label): Delete.
        (region_model::get_frame_at_index (int index) const;): New.
        (region_model::maybe_cast): Delete.
        (region_model::maybe_cast_1): Delete.
        (region_model::get_field_region): Delete.
        (region_model::id deref_rvalue): Convert from region_id and
        svalue_id to const region * and const svalue *.  Drop overload,
        passing in both a tree and an svalue.
        (region_model::set_value): Convert from region_id and svalue_id to
        const region * and const svalue *.
        (region_model::set_to_new_unknown_value): Delete.
        (region_model::clobber_region (const region *reg);): New.
        (region_model::purge_region (const region *reg);): New.
        (region_model::zero_fill_region (const region *reg);): New.
        (region_model::mark_region_as_unknown (const region *reg);): New.
        (region_model::copy_region): Convert from region_id to
        const region *.
        (region_model::eval_condition): Convert from svalue_id to
        const svalue *.
        (region_model::eval_condition_without_cm): Likewise.
        (region_model::compare_initial_and_pointer): New.
        (region_model:maybe_get_constant): Delete.
        (region_model::add_new_malloc_region): Delete.
        (region_model::get_representative_tree): Convert from svalue_id to
        const svalue *.
        (region_model::get_representative_path_var): Delete decl taking a
        region_id in favor of two decls, for svalue vs region, with an
        svalue_set to ensure termination.
        (region_model::get_path_vars_for_svalue): Delete.
        (region_model::create_region_for_heap_alloc): New.
        (region_model::create_region_for_alloca): New.
        (region_model::purge_unused_svalues): Delete.
        (region_model::remap_svalue_ids): Delete.
        (region_model::remap_region_ids): Delete.
        (region_model::purge_regions): Delete.
        (region_model::get_num_svalues): Delete.
        (region_model::get_num_regions): Delete.
        (region_model::get_descendents): Delete.
        (region_model::get_store): New.
        (region_model::delete_region_and_descendents): Delete.
        (region_model::get_manager): New.
        (region_model::unbind_region_and_descendents): New.
        (region_model::can_merge_with_p): Add point param.  Drop
        svalue_id_merger_mapping.
        (region_model::get_value_by_name): Delete.
        (region_model::convert_byte_offset_to_array_index): Delete.
        (region_model::get_or_create_mem_ref): Delete.
        (region_model::get_or_create_pointer_plus_expr): Delete.
        (region_model::get_or_create_view): Delete.
        (region_model::get_lvalue_1): Convert from region_id to
        const region *.
        (region_model::get_rvalue_1): Convert from svalue_id to
        const svalue *.
        (region_model::get_ssa_name_regions_for_current_frame): New.
        (region_model::append_ssa_names_cb): New.
        (region_model::get_store_value): New.
        (region_model::copy_struct_region): Delete.
        (region_model::copy_union_region): Delete.
        (region_model::copy_array_region): Delete.
        (region_model::region_exists_p): New.
        (region_model::make_region_for_unexpected_tree_code): Delete.
        (region_model::loop_replay_fixup): New.
        (region_model::poison_any_pointers_to_bad_regions): Delete.
        (region_model::poison_any_pointers_to_descendents): New.
        (region_model::dump_summary_of_rep_path_vars): Delete.
        (region_model::on_top_level_param): New.
        (region_model::record_dynamic_extents): New.
        (region_model::m_mgr;): New.
        (region_model::m_store;): New.
        (region_model::m_svalues;): Delete.
        (region_model::m_regions;): Delete.
        (region_model::m_root_rid;): Delete.
        (region_model::m_current_frame;): New.
        (region_model_context::remap_svalue_ids): Delete.
        (region_model_context::can_purge_p): Delete.
        (region_model_context::on_svalue_leak): New.
        (region_model_context::on_svalue_purge): Delete.
        (region_model_context::on_liveness_change): New.
        (region_model_context::on_inherited_svalue): Delete.
        (region_model_context::on_cast): Delete.
        (region_model_context::on_unknown_change): Convert from svalue_id to
        const svalue * and add is_mutable.
        (class noop_region_model_context): Update for region_model_context
        changes.
        (model_merger::model_merger): Add program_point.  Drop
        svalue_id_merger_mapping.
        (model_merger::dump_to_pp): Add "simple" param.
        (model_merger::dump): Likewise.
        (model_merger::get_region_a): Delete.
        (model_merger::get_region_b): Delete.
        (model_merger::can_merge_values_p): Delete.
        (model_merger::record_regions): Delete.
        (model_merger::record_svalues): Delete.
        (model_merger::m_point): New field.
        (model_merger::m_map_regions_from_a_to_m): Delete.
        (model_merger::m_map_regions_from_b_to_m): Delete.
        (model_merger::m_sid_mapping): Delete.
        (struct svalue_id_merger_mapping): Delete.
        (class engine): New.
        (struct canonicalization): Delete.
        (inchash::add): Delete decls for hashing svalue_id and region_id.
        (test_region_model_context::on_unexpected_tree_code): Require t to
        be non-NULL.
        (selftest::assert_condition): Add overload comparing a pair of
        const svalue *.
        * sm-file.cc: Include "tristate.h", "selftest.h",
        "analyzer/call-string.h", "analyzer/program-point.h",
        "analyzer/store.h", and "analyzer/region-model.h".
        (fileptr_state_machine::get_default_state): New.
        (fileptr_state_machine::on_stmt): Remove calls to
        get_readable_tree in favor of get_diagnostic_tree.
        * sm-malloc.cc: Include "tristate.h", "selftest.h",
        "analyzer/call-string.h", "analyzer/program-point.h",
        "analyzer/store.h", and "analyzer/region-model.h".
        (malloc_state_machine::get_default_state): New.
        (malloc_state_machine::reset_when_passed_to_unknown_fn_p): New.
        (malloc_diagnostic::describe_state_change): Handle change.m_expr
        being NULL.
        (null_arg::emit): Avoid printing "NULL '0'".
        (null_arg::describe_final_event): Avoid printing "(0) NULL".
        (malloc_leak::emit): Handle m_arg being NULL.
        (malloc_leak::describe_final_event): Handle ev.m_expr being NULL.
        (malloc_state_machine::on_stmt): Don't call get_readable_tree.
        Call get_diagnostic_tree when creating pending diagnostics.
        Update for is_zero_assignment becoming a member function of
        sm_ctxt.
        Don't transition to m_non_heap for ADDR_EXPR(MEM_REF()).
        (malloc_state_machine::reset_when_passed_to_unknown_fn_p): New
        vfunc implementation.
        * sm-sensitive.cc (sensitive_state_machine::warn_for_any_exposure): Call
        get_diagnostic_tree and pass the result to warn_for_state.
        * sm-signal.cc: Move includes of "analyzer/call-string.h" and
        "analyzer/program-point.h" to before "analyzer/region-model.h",
        and also include "analyzer/store.h" before it.
        (signal_unsafe_call::describe_state_change): Use
        get_dest_function to get handler.
        (update_model_for_signal_handler): Pass manager to region_model
        ctor.
        (register_signal_handler::impl_transition): Update for changes to
        get_or_create_node and add_edge.
        * sm-taint.cc (taint_state_machine::on_stmt): Remove calls to
        get_readable_tree, replacing them when calling warn_for_state with
        calls to get_diagnostic_tree.
        * sm.cc (is_zero_assignment): Delete.
        (any_pointer_p): Move to within namespace ana.
        * sm.h (is_zero_assignment): Remove decl.
        (any_pointer_p): Move decl to within namespace ana.
        (state_machine::get_default_state): New vfunc.
        (state_machine::reset_when_passed_to_unknown_fn_p): New vfunc.
        (sm_context::get_readable_tree): Rename to...
        (sm_context::get_diagnostic_tree): ...this.
        (sm_context::is_zero_assignment): New vfunc.
        * store.cc: New file.
        * store.h: New file.
        * svalue.cc: New file.

2020-05-22  Mark Wielaard  <mark@klomp.org>

        * sm-signal.cc(signal_unsafe_call::emit): Possibly add
        gcc_rich_location note for replacement.
        (signal_unsafe_call::get_replacement_fn): New private function.
        (get_async_signal_unsafe_fns): Add "exit".

2020-04-28  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/94816
        * engine.cc (impl_region_model_context::on_unexpected_tree_code):
        Handle NULL tree.
        * region-model.cc (region_model::add_region_for_type): Handle
        NULL type.
        * region-model.h
        (test_region_model_context::on_unexpected_tree_code): Handle NULL
        tree.

2020-04-28  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/94447
        PR analyzer/94639
        PR analyzer/94732
        PR analyzer/94754
        * analyzer.opt (Wanalyzer-use-of-uninitialized-value): Delete.
        * program-state.cc (selftest::test_program_state_dumping): Update
        expected dump result for removal of "uninit".
        * region-model.cc (poison_kind_to_str): Delete POISON_KIND_UNINIT
        case.
        (root_region::ensure_stack_region): Initialize stack with null
        svalue_id rather than with a typeless POISON_KIND_UNINIT value.
        (root_region::ensure_heap_region): Likewise for the heap.
        (region_model::dump_summary_of_rep_path_vars): Remove
        summarization of uninit values.
        (region_model::validate): Remove check that the stack has a
        POISON_KIND_UNINIT value.
        (poisoned_value_diagnostic::emit): Remove POISON_KIND_UNINIT
        case.
        (poisoned_value_diagnostic::describe_final_event): Likewise.
        (selftest::test_dump): Update expected dump result for removal of
        "uninit".
        (selftest::test_svalue_equality): Remove "uninit" and "freed".
        * region-model.h (enum poison_kind): Remove POISON_KIND_UNINIT.

2020-04-01  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/94378
        * checker-path.cc: Include "bitmap.h".
        * constraint-manager.cc: Likewise.
        * diagnostic-manager.cc: Likewise.
        * engine.cc: Likewise.
        (exploded_node::detect_leaks): Pass null region_id to pop_frame.
        * program-point.cc: Include "bitmap.h".
        * program-state.cc: Likewise.
        * region-model.cc (id_set<region_id>::id_set): Convert to...
        (region_id_set::region_id_set): ...this.
        (svalue_id_set::svalue_id_set): New ctor.
        (region_model::copy_region): New function.
        (region_model::copy_struct_region): New function.
        (region_model::copy_union_region): New function.
        (region_model::copy_array_region): New function.
        (stack_region::pop_frame): Drop return value.  Add
        "result_dst_rid" param; if it is non-null, use copy_region to copy
        the result to it.  Rather than capture and pass a single "known
        used" return value to be used by purge_unused_values, instead
        gather and pass a set of known used return values.
        (root_region::pop_frame): Drop return value.  Add "result_dst_rid"
        param.
        (region_model::on_assignment): Use copy_region.
        (region_model::on_return): Likewise for the result.
        (region_model::on_longjmp): Pass null for pop_frame's
        result_dst_rid.
        (region_model::update_for_return_superedge): Pass the region for the
        return value of the call, if any, to pop_frame, rather than setting
        the lvalue for the lhs of the result.
        (region_model::pop_frame): Drop return value.  Add
        "result_dst_rid" param.
        (region_model::purge_unused_svalues): Convert third param from an
        svalue_id * to an svalue_id_set *, updating the initial populating
        of the "used" bitmap accordingly.  Don't remap it when done.
        (struct selftest::coord_test): New selftest fixture, extracted from...
        (selftest::test_dump_2): ...here.
        (selftest::test_compound_assignment): New selftest.
        (selftest::test_stack_frames): Pass null to new param of pop_frame.
        (selftest::analyzer_region_model_cc_tests): Call the new selftest.
        * region-model.h (class id_set): Delete template.
        (class region_id_set): Reimplement, using old id_set implementation.
        (class svalue_id_set): Likewise.  Convert from auto_sbitmap to
        auto_bitmap.
        (region::get_active_view): New accessor.
        (stack_region::pop_frame): Drop return value.  Add
        "result_dst_rid" param.
        (root_region::pop_frame): Likewise.
        (region_model::pop_frame): Likewise.
        (region_model::copy_region): New decl.
        (region_model::purge_unused_svalues): Convert third param from an
        svalue_id * to an svalue_id_set *.
        (region_model::copy_struct_region): New decl.
        (region_model::copy_union_region): New decl.
        (region_model::copy_array_region): New decl.

2020-03-27  David Malcolm  <dmalcolm@redhat.com>

        * program-state.cc (selftest::test_program_state_dumping): Update
        expected dump to include symbolic_region's possibly_null field.
        * region-model.cc (symbolic_region::print_fields): New vfunc
        implementation.
        (region_model::add_constraint): Clear m_possibly_null from
        symbolic_regions now known to be non-NULL.
        (selftest::test_malloc_constraints): New selftest.
        (selftest::analyzer_region_model_cc_tests): Call it.
        * region-model.h (region::dyn_cast_symbolic_region): Add non-const
        overload.
        (symbolic_region::dyn_cast_symbolic_region): Implement it.
        (symbolic_region::print_fields): New vfunc override decl.

2020-03-27  David Malcolm  <dmalcolm@redhat.com>

        * analyzer.h (class feasibility_problem): New forward decl.
        * diagnostic-manager.cc (saved_diagnostic::saved_diagnostic):
        Initialize new fields m_status, m_epath_length, and m_problem.
        (saved_diagnostic::~saved_diagnostic): Delete m_problem.
        (dedupe_candidate::dedupe_candidate): Convert "sd" param from a
        const ref to a mutable ptr.
        (dedupe_winners::add): Convert "sd" param from a const ref to a
        mutable ptr.  Record the length of the exploded_path.  Record the
        feasibility/infeasibility of sd into sd, capturing a
        feasibility_problem when feasible_p fails, and storing it in sd.
        (diagnostic_manager::emit_saved_diagnostics): Update for pass by
        ptr rather than by const ref.
        * diagnostic-manager.h (class saved_diagnostic): Add new enum
        status.  Add fields m_status, m_epath_length and m_problem.
        (saved_diagnostic::set_feasible): New member function.
        (saved_diagnostic::set_infeasible): New member function.
        (saved_diagnostic::get_feasibility_problem): New accessor.
        (saved_diagnostic::get_status): New accessor.
        (saved_diagnostic::set_epath_length): New member function.
        (saved_diagnostic::get_epath_length): New accessor.
        * engine.cc: Include "gimple-pretty-print.h".
        (exploded_path::feasible_p): Add OUT param and, if non-NULL, write
        a new feasibility_problem to it on failure.
        (viz_callgraph_node::dump_dot): Convert begin_tr calls to
        begin_trtd.  Convert end_tr calls to end_tdtr.
        (class exploded_graph_annotator): New subclass of dot_annotator.
        (impl_run_checkers): Add a second -fdump-analyzer-supergraph dump
        after the analysis runs, using exploded_graph_annotator. dumping
        to DUMP_BASE_NAME.supergraph-eg.dot.
        * exploded-graph.h (exploded_node::get_dot_fillcolor): Make
        public.
        (exploded_path::feasible_p): Add OUT param.
        (class feasibility_problem): New class.
        * state-purge.cc (state_purge_annotator::add_node_annotations):
        Return a bool, add a "within_table" param.
        (print_vec_of_names): Convert begin_tr calls to begin_trtd.
        Convert end_tr calls to end_tdtr.
        (state_purge_annotator::add_stmt_annotations): Add "within_row"
        param.
        * state-purge.h ((state_purge_annotator::add_node_annotations):
        Return a bool, add a "within_table" param.
        (state_purge_annotator::add_stmt_annotations): Add "within_row"
        param.
        * supergraph.cc (supernode::dump_dot): Call add_node_annotations
        twice: as before, passing false for "within_table", then again
        with true when within the TABLE element.  Convert some begin_tr
        calls to begin_trtd, and some end_tr calls to end_tdtr.
        Repeat each add_stmt_annotations call, distinguishing between
        calls that add TRs and those that add TDs to an existing TR.
        Add a call to add_after_node_annotations.
        * supergraph.h (dot_annotator::add_node_annotations): Add a
        "within_table" param.
        (dot_annotator::add_stmt_annotations): Add a "within_row" param.
        (dot_annotator::add_after_node_annotations): New vfunc.

2020-03-27  David Malcolm  <dmalcolm@redhat.com>

        * diagnostic-manager.cc (dedupe_winners::add): Show the
        exploded_node index in the log messages.
        (diagnostic_manager::emit_saved_diagnostics): Log a summary of
        m_saved_diagnostics at entry.

2020-03-27  David Malcolm  <dmalcolm@redhat.com>

        * supergraph.cc (superedge::dump): Add space before description;
        move newline to non-pretty_printer overload.

2020-03-18  David Malcolm  <dmalcolm@redhat.com>

        * region-model.cc: Include "stor-layout.h".
        (region_model::dump_to_pp): Rather than calling
        dump_summary_of_map on each of the current frame and the globals,
        instead get a vec of representative path_vars for all regions,
        and then dump a summary of all of them.
        (region_model::dump_summary_of_map): Delete, rewriting into...
        (region_model::dump_summary_of_rep_path_vars): ...this new
        function, working on a vec of path_vars.
        (region_model::set_value): New overload.
        (region_model::get_representative_path_var): Rename
        "parent_region" local to "parent_reg" and consolidate with other
        local.  Guard test for grandparent being stack on parent_reg being
        non-NULL.  Move handling for parent being an array_region to
        within guard for parent_reg being non-NULL.
        (selftest::make_test_compound_type): New function.
        (selftest::test_dump_2): New selftest.
        (selftest::test_dump_3): New selftest.
        (selftest::test_stack_frames): Update expected output from
        simplified dump to show "a" and "b" from parent frame and "y" in
        child frame.
        (selftest::analyzer_region_model_cc_tests): Call test_dump_2 and
        test_dump_3.
        * region-model.h (region_model::set_value): New overload decl.
        (region_model::dump_summary_of_map): Delete.
        (region_model::dump_summary_of_rep_path_vars): New.

2020-03-18  David Malcolm  <dmalcolm@redhat.com>

        * region-model.h (class noop_region_model_context): New subclass
        of region_model_context.
        (class tentative_region_model_context): Inherit from
        noop_region_model_context rather than from region_model_context;
        drop redundant vfunc implementations.
        (class test_region_model_context): Likewise.

2020-03-18  David Malcolm  <dmalcolm@redhat.com>

        * engine.cc (exploded_node::exploded_node): Move implementation
        here from header; accept point_and_state by const reference rather
        than by value.
        * exploded-graph.h (exploded_node::exploded_node): Pass
        point_and_state by const reference rather than by value.  Move
        body to engine.cc.

2020-03-18  Jakub Jelinek  <jakub@redhat.com>

        * sm-malloc.cc (malloc_state_machine::on_stmt): Fix up duplicated word
        issue in a comment.
        * region-model.cc (region_model::make_region_for_unexpected_tree_code,
        region_model::delete_region_and_descendents): Likewise.
        * engine.cc (class exploded_cluster): Likewise.
        * diagnostic-manager.cc (class path_builder): Likewise.

2020-03-13  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/94099
        PR analyzer/94105
        * diagnostic-manager.cc (for_each_state_change): Bulletproof
        against errors in get_rvalue by passing a
        tentative_region_model_context and rejecting if there's an error.
        * region-model.cc (region_model::get_lvalue_1): When handling
        ARRAY_REF, handle results of error-handling.  Handle NOP_EXPR.

2020-03-06  David Malcolm  <dmalcolm@redhat.com>

        * analyzer.h (class array_region): New forward decl.
        * program-state.cc (selftest::test_program_state_dumping_2): New.
        (selftest::analyzer_program_state_cc_tests): Call it.
        * region-model.cc (array_region::constant_from_key): New.
        (region_model::get_representative_tree): Handle region_svalue by
        generating an ADDR_EXPR.
        (region_model::get_representative_path_var): In view handling,
        remove erroneous TREE_TYPE when determining the type of the tree.
        Handle array regions and STRING_CST.
        (selftest::assert_dump_tree_eq): New.
        (ASSERT_DUMP_TREE_EQ): New macro.
        (selftest::test_get_representative_tree): New selftest.
        (selftest::analyzer_region_model_cc_tests): Call it.
        * region-model.h (region::dyn_cast_array_region): New vfunc.
        (array_region::dyn_cast_array_region): New vfunc implementation.
        (array_region::constant_from_key): New decl.

2020-03-06  David Malcolm  <dmalcolm@redhat.com>

        * analyzer.h (dump_quoted_tree): New decl.
        * engine.cc (exploded_node::dump_dot): Pass region model to
        sm_state_map::print.
        * program-state.cc: Include diagnostic-core.h.
        (sm_state_map::print): Add "model" param and use it to print
        representative trees.  Only print origin information if non-null.
        (sm_state_map::dump): Pass NULL for model to print call.
        (program_state::print): Pass region model to sm_state_map::print.
        (program_state::dump_to_pp): Use spaces rather than newlines when
        summarizing.  Pass region_model to sm_state_map::print.
        (ana::selftest::assert_dump_eq): New function.
        (ASSERT_DUMP_EQ): New macro.
        (ana::selftest::test_program_state_dumping): New function.
        (ana::selftest::analyzer_program_state_cc_tests): Call it.
        * program-state.h (program_state::print): Add model param.
        * region-model.cc (dump_quoted_tree): New function.
        (map_region::print_fields): Use dump_quoted_tree rather than
        %qE to avoid lang-dependent output.
        (map_region::dump_child_label): Likewise.
        (region_model::dump_summary_of_map): For SK_REGION, when
        get_representative_path_var fails, print the region id rather than
        erroneously printing NULL.
        * sm.cc (state_machine::get_state_by_name): New function.
        * sm.h (state_machine::get_state_by_name): New decl.

2020-03-04  David Malcolm  <dmalcolm@redhat.com>

        * region-model.cc (region::validate): Convert model param from ptr
        to reference.  Update comment to reflect that it's now a vfunc.
        (map_region::validate): New vfunc implementation.
        (array_region::validate): New vfunc implementation.
        (stack_region::validate): New vfunc implementation.
        (root_region::validate): New vfunc implementation.
        (region_model::validate): Pass a reference rather than a pointer
        to the region::validate vfunc.
        * region-model.h (region::validate): Make virtual.  Convert model
        param from ptr to reference.
        (map_region::validate): New vfunc decl.
        (array_region::validate): New vfunc decl.
        (stack_region::validate): New vfunc decl.
        (root_region::validate): New vfunc decl.

2020-03-04  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93993
        * region-model.cc (region_model::on_call_pre): Handle
        BUILT_IN_EXPECT and its variants.
        (region_model::add_any_constraints_from_ssa_def_stmt): Split out
        gassign handling into add_any_constraints_from_gassign; add gcall
        handling.
        (region_model::add_any_constraints_from_gassign): New function,
        based on the above.  Add handling for NOP_EXPR.
        (region_model::add_any_constraints_from_gcall): New function.
        (region_model::get_representative_path_var): Handle views.
        * region-model.h
        (region_model::add_any_constraints_from_ssa_def_stmt): New decl.
        (region_model::add_any_constraints_from_gassign): New decl.

2020-03-04  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93993
        * checker-path.h (state_change_event::get_lvalue): Add ctxt param
        and pass it to region_model::get_value call.
        * diagnostic-manager.cc (get_any_origin): Pass a
        tentative_region_model_context to the calls to get_lvalue and reject
        the comparison if errors occur.
        (can_be_expr_of_interest_p): New function.
        (diagnostic_manager::prune_for_sm_diagnostic): Replace checks for
        CONSTANT_CLASS_P with calls to update_for_unsuitable_sm_exprs.
        Pass a tentative_region_model_context to the calls to
        state_change_event::get_lvalue and reject the comparison if errors
        occur.
        (diagnostic_manager::update_for_unsuitable_sm_exprs): New.
        * diagnostic-manager.h
        (diagnostic_manager::update_for_unsuitable_sm_exprs): New decl.
        * region-model.h (class tentative_region_model_context): New class.

2020-03-04  David Malcolm  <dmalcolm@redhat.com>

        * engine.cc (worklist::worklist): Remove unused field m_eg.
        (class viz_callgraph_edge): Remove unused field m_call_sedge.
        (class viz_callgraph): Remove unused field m_sg.
        * exploded-graph.h (worklist::::m_eg): Remove unused field.

2020-03-02  David Malcolm  <dmalcolm@redhat.com>

        * analyzer.opt (fanalyzer-show-duplicate-count): New option.
        * diagnostic-manager.cc
        (diagnostic_manager::emit_saved_diagnostic): Use the above to
        guard the printing of the duplicate count.

2020-03-02  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93959
        * analyzer.cc (is_std_function_p): New function.
        (is_std_named_call_p): New functions.
        * analyzer.h (is_std_named_call_p): New decl.
        * sm-malloc.cc (malloc_state_machine::on_stmt): Check for "std::"
        variants when checking for malloc, calloc and free.

2020-02-26  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93950
        * diagnostic-manager.cc
        (diagnostic_manager::prune_for_sm_diagnostic): Assert that var is
        either NULL or not a constant.  When updating var, bulletproof
        against constant values.

2020-02-26  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93947
        * region-model.cc (region_model::get_fndecl_for_call): Gracefully
        fail for fn_decls that don't have a cgraph_node.

2020-02-26  David Malcolm  <dmalcolm@redhat.com>

        * bar-chart.cc: New file.
        * bar-chart.h: New file.
        * engine.cc: Include "analyzer/bar-chart.h".
        (stats::log): Only log the m_num_nodes kinds that are non-zero.
        (stats::dump): Likewise when dumping.
        (stats::get_total_enodes): New.
        (exploded_graph::get_or_create_node): Increment the per-point-data
        m_excess_enodes when hitting the per-program-point limit on
        enodes.
        (exploded_graph::print_bar_charts): New.
        (exploded_graph::log_stats): Log the number of unprocessed enodes
        in the worklist.  Call print_bar_charts.
        (exploded_graph::dump_stats): Print the number of unprocessed
        enodes in the worklist.
        * exploded-graph.h (stats::get_total_enodes): New decl.
        (struct per_program_point_data): Add field m_excess_enodes.
        (exploded_graph::print_bar_charts): New decl.
        * supergraph.cc (superedge::dump): New.
        (superedge::dump): New.
        * supergraph.h (supernode::get_function): New.
        (superedge::dump): New decl.
        (superedge::dump): New decl.

2020-02-24  David Malcolm  <dmalcolm@redhat.com>

        * engine.cc (exploded_graph::get_or_create_node): Dump the
        program_state to the pp, rather than to stderr.

2020-02-24  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93032
        * sm.cc (make_checkers): Require the "taint" checker to be
        explicitly enabled.

2020-02-24  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93899
        * engine.cc
        (impl_region_model_context::impl_region_model_context): Add logger
        param.
        * engine.cc (exploded_graph::add_function_entry): Create an
        impl_region_model_context and pass it to the push_frame call.
        Bail if the resulting state is invalid.
        (exploded_graph::build_initial_worklist): Likewise.
        (exploded_graph::build_initial_worklist): Handle the case where
        add_function_entry fails.
        * exploded-graph.h
        (impl_region_model_context::impl_region_model_context): Add logger
        param.
        * region-model.cc (map_region::get_or_create): Add ctxt param and
        pass it to add_region_for_type.
        (map_region::can_merge_p): Pass NULL as a ctxt to call to
        get_or_create.
        (array_region::get_element): Pass ctxt to call to get_or_create.
        (array_region::get_or_create): Add ctxt param and pass it to
        add_region_for_type.
        (root_region::push_frame): Pass ctxt to get_or_create calls.
        (region_model::get_lvalue_1): Likewise.
        (region_model::make_region_for_unexpected_tree_code): Assert that
        ctxt is non-NULL.
        (region_model::get_rvalue_1): Pass ctxt to get_svalue_for_fndecl
        and get_svalue_for_label calls.
        (region_model::get_svalue_for_fndecl): Add ctxt param and pass it
        to get_region_for_fndecl.
        (region_model::get_region_for_fndecl): Add ctxt param and pass it
        to get_or_create.
        (region_model::get_svalue_for_label): Add ctxt param and pass it
        to get_region_for_label.
        (region_model::get_region_for_label): Add ctxt param and pass it
        to get_region_for_fndecl and get_or_create.
        (region_model::get_field_region): Add ctxt param and pass it to
        get_or_create_view and get_or_create.
        (make_region_for_type): Replace gcc_unreachable with return NULL.
        (region_model::add_region_for_type): Add ctxt param.  Handle a
        return of NULL from make_region_for_type by calling
        make_region_for_unexpected_tree_code.
        (region_model::get_or_create_mem_ref): Pass ctxt to calls to
        get_or_create_view.
        (region_model::get_or_create_view): Add ctxt param and pass it to
        add_region_for_type.
        (selftest::test_state_merging): Pass ctxt to get_or_create_view.
        * region-model.h (region_model::get_or_create): Add ctxt param.
        (region_model::add_region_for_type): Likewise.
        (region_model::get_svalue_for_fndecl): Likewise.
        (region_model::get_svalue_for_label): Likewise.
        (region_model::get_region_for_fndecl): Likewise.
        (region_model::get_region_for_label): Likewise.
        (region_model::get_field_region): Likewise.
        (region_model::get_or_create_view): Likewise.

2020-02-24  David Malcolm  <dmalcolm@redhat.com>

        * checker-path.cc (superedge_event::should_filter_p): Update
        filter for empty descriptions to cover verbosity level 3 as well
        as 2.
        * diagnostic-manager.cc: Include "analyzer/reachability.h".
        (class path_builder): New class.
        (diagnostic_manager::emit_saved_diagnostic): Create a path_builder
        and pass it to build_emission_path, rather passing eg; similarly
        for add_events_for_eedge and ext_state.
        (diagnostic_manager::build_emission_path): Replace "eg" param
        with a path_builder, pass it to add_events_for_eedge.
        (diagnostic_manager::add_events_for_eedge): Replace ext_state
        param with path_builder; pass it to add_events_for_superedge.
        (diagnostic_manager::significant_edge_p): New.
        (diagnostic_manager::add_events_for_superedge): Add path_builder
        param.  Reject insignificant edges at verbosity levels below 3.
        (diagnostic_manager::prune_for_sm_diagnostic): Update highest
        verbosity level to 4.
        * diagnostic-manager.h (class path_builder): New forward decl.
        (diagnostic_manager::build_emission_path): Replace "eg" param
        with a path_builder.
        (diagnostic_manager::add_events_for_eedge): Replace ext_state
        param with path_builder.
        (diagnostic_manager::significant_edge_p): New.
        (diagnostic_manager::add_events_for_superedge): Add path_builder
        param.
        * reachability.h: New file.

2020-02-18  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93692
        * analyzer.opt (fdump-analyzer-callgraph): Rewrite description.

2020-02-18  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93777
        * region-model.cc (region_model::maybe_cast_1): Replace assertion
        that build_cast returns non-NULL with a conditional, falling
        through to the logic which returns a new unknown value of the
        desired type if it fails.

2020-02-18  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93778
        * engine.cc (impl_region_model_context::on_unknown_tree_code):
        Rename to...
        (impl_region_model_context::on_unexpected_tree_code): ...this and
        convert first argument from path_var to tree.
        (exploded_node::on_stmt): Pass ctxt to purge_for_unknown_fncall.
        * exploded-graph.h (region_model_context::on_unknown_tree_code):
        Rename to...
        (region_model_context::on_unexpected_tree_code): ...this and
        convert first argument from path_var to tree.
        * program-state.cc (sm_state_map::purge_for_unknown_fncall): Add
        ctxt param and pass on to calls to get_rvalue.
        * program-state.h (sm_state_map::purge_for_unknown_fncall): Add
        ctxt param.
        * region-model.cc (region_model::handle_unrecognized_call): Pass
        ctxt on to call to get_rvalue.
        (region_model::get_lvalue_1): Move body of default case to
        region_model::make_region_for_unexpected_tree_code and call it.
        Within COMPONENT_REF case, reject attempts to handle types other
        than RECORD_TYPE and UNION_TYPE.
        (region_model::make_region_for_unexpected_tree_code): New
        function, based on default case of region_model::get_lvalue_1.
        * region-model.h
        (region_model::make_region_for_unexpected_tree_code): New decl.
        (region_model::on_unknown_tree_code): Rename to...
        (region_model::on_unexpected_tree_code): ...this and convert first
        argument from path_var to tree.
        (class test_region_model_context): Update vfunc implementation for
        above change.

2020-02-18  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93774
        * region-model.cc
        (region_model::convert_byte_offset_to_array_index): Use
        int_size_in_bytes before calling size_in_bytes, to gracefully fail
        on incomplete types.

2020-02-17  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93775
        * region-model.cc (region_model::get_fndecl_for_call): Handle the
        case where the code_region's get_tree_for_child_region returns
        NULL.

2020-02-17  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93388
        * engine.cc (impl_region_model_context::on_unknown_tree_code):
        New.
        (exploded_graph::get_or_create_node): Reject invalid states.
        * exploded-graph.h
        (impl_region_model_context::on_unknown_tree_code): New decl.
        (point_and_state::point_and_state): Assert that the state is
        valid.
        * program-state.cc (program_state::program_state): Initialize
        m_valid to true.
        (program_state::operator=): Copy m_valid.
        (program_state::program_state): Likewise for move constructor.
        (program_state::print): Print m_valid.
        (program_state::dump_to_pp): Likewise.
        * program-state.h (program_state::m_valid): New field.
        * region-model.cc (region_model::get_lvalue_1): Implement the
        default case by returning a new symbolic region and calling
        the context's on_unknown_tree_code, rather than issuing an
        internal_error.  Implement VIEW_CONVERT_EXPR.
        * region-model.h (region_model_context::on_unknown_tree_code): New
        vfunc.
        (test_region_model_context::on_unknown_tree_code): New.

2020-02-17  David Malcolm  <dmalcolm@redhat.com>

        * sm-malloc.cc (malloc_diagnostic::describe_state_change): For
        transition to the "null" state, only say "assuming" when
        transitioning from the "unchecked" state.

2020-02-17  David Malcolm  <dmalcolm@redhat.com>

        * diagnostic-manager.h (diagnostic_manager::get_saved_diagnostic):
        Add const overload.
        * engine.cc (exploded_node::dump_dot): Dump saved_diagnostics.
        * exploded-graph.h (exploded_graph::get_diagnostic_manager): Add
        const overload.

2020-02-11  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93288
        * analysis-plan.cc (analysis_plan::use_summary_p): Look through
        the ultimate_alias_target when getting the called function.
        * engine.cc (exploded_node::on_stmt): Rename second "ctxt" to
        "sm_ctxt".  Use the region_model's get_fndecl_for_call rather than
        gimple_call_fndecl.
        * region-model.cc (region_model::get_fndecl_for_call): Use
        ultimate_alias_target on fndecl.
        * supergraph.cc (get_ultimate_function_for_cgraph_edge): New
        function.
        (supergraph_call_edge): Use it when rejecting edges without
        functions.
        (supergraph::supergraph): Use it to get the function for the
        cgraph_edge when building interprocedural superedges.
        (callgraph_superedge::get_callee_function):  Use it.
        * supergraph.h (supergraph::get_num_snodes): Make param const.
        (supergraph::function_to_num_snodes_t): Make first type param
        const.

2020-02-11  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93374
        * engine.cc (exploded_edge::exploded_edge): Add ext_state param
        and pass it to change.validate.
        (exploded_graph::get_or_create_node): Move purging of change
        svalues to also cover the case of reusing an existing enode.
        (exploded_graph::add_edge): Pass m_ext_state to exploded_edge's
        ctor.
        * exploded-graph.h (exploded_edge::exploded_edge): Add ext_state
        param.
        * program-state.cc (state_change::sm_change::validate): Likewise.
        Assert that m_sm_idx is sane.  Use ext_state to validate
        m_old_state and m_new_state.
        (state_change::validate): Add ext_state param and pass it to
        the sm_change validate calls.
        * program-state.h (state_change::sm_change::validate): Add
        ext_state param.
        (state_change::validate): Likewise.

2020-02-11  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93669
        * engine.cc (exploded_graph::dump_exploded_nodes): Handle missing
        case of STATUS_WORKLIST in implementation of
        "__analyzer_dump_exploded_nodes".

2020-02-11  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93649
        * constraint-manager.cc (constraint_manager::add_constraint): When
        merging equivalence classes and updating m_constant, also update
        m_cst_sid.
        (constraint_manager::validate): If m_constant is non-NULL assert
        that m_cst_sid is non-null and is valid.

2020-02-11  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93657
        * analyzer.opt (fdump-analyzer): Reword description.
        (fdump-analyzer-stderr): Likewise.

2020-02-11  David Malcolm  <dmalcolm@redhat.com>

        * region-model.cc (print_quoted_type): New function.
        (svalue::print): Use it to replace %qT.
        (region::dump_to_pp): Likewise.
        (region::dump_child_label): Likewise.
        (region::print_fields): Likewise.

2020-02-10  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93659
        * analyzer.opt (-param=analyzer-max-recursion-depth=): Fix "tha"
        -> "that" typo.
        (Wanalyzer-use-of-uninitialized-value): Fix "initialized" ->
        "uninitialized" typo.

2020-02-10  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93350
        * region-model.cc (region_model::get_lvalue_1):
        Handle BIT_FIELD_REF.
        (make_region_for_type): Handle VECTOR_TYPE.

2020-02-10  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93647
        * diagnostic-manager.cc
        (diagnostic_manager::prune_for_sm_diagnostic): Bulletproof against
        VAR being constant.
        * region-model.cc (region_model::get_lvalue_1): Provide a better
        error message when encountering an unhandled tree code.

2020-02-10  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93405
        * region-model.cc (region_model::get_lvalue_1): Implement
        CONST_DECL.

2020-02-06  David Malcolm  <dmalcolm@redhat.com>

        * region-model.cc (region_model::maybe_cast_1): Attempt to provide
        a region_svalue if either type is a pointer, rather than if both
        types are pointers.

2020-02-05  David Malcolm  <dmalcolm@redhat.com>

        * engine.cc (exploded_node::dump_dot): Show merger enodes.
        (worklist::add_node): Assert that the node's m_status is
        STATUS_WORKLIST.
        (exploded_graph::process_worklist): Likewise for nodes from the
        worklist.  Set status of merged nodes to STATUS_MERGER.
        (exploded_graph::process_node): Set status of node to
        STATUS_PROCESSED.
        (exploded_graph::dump_exploded_nodes): Rework handling of
        "__analyzer_dump_exploded_nodes", splitting enodes by status into
        "processed" and "merger", showing the count of just the processed
        enodes at the call, rather than the count of all enodes.
        * exploded-graph.h (exploded_node::status): New enum.
        (exploded_node::exploded_node): Initialize m_status to
        STATUS_WORKLIST.
        (exploded_node::get_status): New getter.
        (exploded_node::set_status): New setter.

2020-02-04  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93543
        * engine.cc (pod_hash_traits<function_call_string>::mark_empty):
        Eliminate reinterpret_cast.
        (pod_hash_traits<function_call_string>::is_empty): Likewise.

2020-02-03  David Malcolm  <dmalcolm@redhat.com>

        * constraint-manager.cc (range::constrained_to_single_element):
        Replace fold_build2 with fold_binary.  Remove unnecessary newline.
        (constraint_manager::get_or_add_equiv_class): Replace fold_build2
        with fold_binary in two places, and remove out-of-date comment.
        (constraint_manager::eval_condition): Replace fold_build2 with
        fold_binary.
        * region-model.cc (constant_svalue::eval_condition): Likewise.
        (region_model::on_assignment): Likewise.

2020-02-03  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93544
        * diagnostic-manager.cc
        (diagnostic_manager::prune_for_sm_diagnostic): Bulletproof
        against bad choices due to bad paths.
        * engine.cc (impl_region_model_context::on_phi): New.
        * exploded-graph.h (impl_region_model_context::on_phi): New decl.
        * region-model.cc (region_model::on_longjmp): Likewise.
        (region_model::handle_phi): Add phi param.  Call the ctxt's on_phi
        vfunc.
        (region_model::update_for_phis): Pass phi to handle_phi.
        * region-model.h (region_model::handle_phi): Add phi param.
        (region_model_context::on_phi): New vfunc.
        (test_region_model_context::on_phi): New.
        * sm-malloc.cc (malloc_state_machine::on_phi): New.
        (malloc_state_machine::on_zero_assignment): New.
        * sm.h (state_machine::on_phi): New vfunc.

2020-02-03  David Malcolm  <dmalcolm@redhat.com>

        * engine.cc (supernode_cluster::dump_dot): Show BB index as
        well as SN index.
        * supergraph.cc (supernode::dump_dot): Likewise.

2020-02-03  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93546
        * region-model.cc (region_model::on_call_pre): Update for new
        param of symbolic_region ctor.
        (region_model::deref_rvalue): Likewise.
        (region_model::add_new_malloc_region): Likewise.
        (make_region_for_type): Likewise, preserving type.
        * region-model.h (symbolic_region::symbolic_region): Add "type"
        param and pass it to base class ctor.

2020-02-03  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93547
        * constraint-manager.cc
        (constraint_manager::get_or_add_equiv_class): Ensure types are
        compatible before comparing constants.

2020-01-31  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93457
        * region-model.cc (make_region_for_type): Use VOID_TYPE_P rather
        than checking against void_type_node.

2020-01-31  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93373
        * region-model.cc (ASSERT_COMPAT_TYPES): Convert to...
        (assert_compat_types): ...this, and bail when either type is NULL,
        or when VOID_TYPE_P (dst_type).
        (region_model::get_lvalue): Update for above conversion.
        (region_model::get_rvalue): Likewise.

2020-01-31  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93379
        * region-model.cc (region_model::update_for_return_superedge):
        Move check for null result so that it also guards setting the
        lhs.

2020-01-31  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93438
        * region-model.cc (stack_region::can_merge_p): Split into a two
        pass approach, creating all stack regions first, then populating
        them.
        (selftest::test_state_merging): Add test coverage for (a) the case
        of self-merging a model in which a local in an older stack frame
        points to a local in a more recent stack frame (which previously
        would ICE), and (b) the case of self-merging a model in which a
        local points to a global (which previously worked OK).

2020-01-31  David Malcolm  <dmalcolm@redhat.com>

        * analyzer.cc (is_named_call_p): Replace tests for fndecl being
        extern at file scope and having a non-NULL DECL_NAME with a call
        to maybe_special_function_p.
        * function-set.cc (function_set::contains_decl_p): Add call to
        maybe_special_function_p.

2020-01-31  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93450
        * constraint-manager.cc
        (constraint_manager::get_or_add_equiv_class): Only compare constants
        if their types are compatible.
        * region-model.cc (constant_svalue::eval_condition): Replace check
        for identical types with call to types_compatible_p.

2020-01-30  David Malcolm  <dmalcolm@redhat.com>

        * program-state.cc (extrinsic_state::dump_to_pp): New.
        (extrinsic_state::dump_to_file): New.
        (extrinsic_state::dump): New.
        * program-state.h (extrinsic_state::dump_to_pp): New decl.
        (extrinsic_state::dump_to_file): New decl.
        (extrinsic_state::dump): New decl.
        * sm.cc: Include "pretty-print.h".
        (state_machine::dump_to_pp): New.
        * sm.h (state_machine::dump_to_pp): New decl.

2020-01-30  David Malcolm  <dmalcolm@redhat.com>

        * diagnostic-manager.cc (for_each_state_change): Use
        extrinsic_state::get_num_checkers rather than accessing m_checkers
        directly.
        * program-state.cc (program_state::program_state): Likewise.
        * program-state.h (extrinsic_state::m_checkers): Make private.

2020-01-30  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93356
        * region-model.cc (region_model::eval_condition): In both
        overloads, bail out immediately on floating-point types.
        (region_model::eval_condition_without_cm): Likewise.
        (region_model::add_constraint): Likewise.

2020-01-30  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93450
        * program-state.cc (sm_state_map::set_state): For the overload
        taking an svalue_id, bail out if the set_state on the ec does
        nothing.  Convert the latter's return type from void to bool,
        returning true if anything changed.
        (sm_state_map::impl_set_state): Convert the return type from void
        to bool, returning true if the state changed.
        * program-state.h (sm_state_map::set_state): Convert return type
        from void to bool.
        (sm_state_map::impl_set_state): Likewise.
        * region-model.cc (constant_svalue::eval_condition): Only call
        fold_build2 if the types are the same.

2020-01-29  Jakub Jelinek  <jakub@redhat.com>

        * analyzer.h (PUSH_IGNORE_WFORMAT, POP_IGNORE_WFORMAT): Remove.
        * constraint-manager.cc: Include diagnostic-core.h before graphviz.h.
        (range::dump, equiv_class::print): Don't use PUSH_IGNORE_WFORMAT or
        POP_IGNORE_WFORMAT.
        * state-purge.cc: Include diagnostic-core.h before
        gimple-pretty-print.h.
        (state_purge_annotator::add_node_annotations, print_vec_of_names):
        Don't use PUSH_IGNORE_WFORMAT or POP_IGNORE_WFORMAT.
        * region-model.cc: Move diagnostic-core.h include before graphviz.h.
        (path_var::dump, svalue::print, constant_svalue::print_details,
        region::dump_to_pp, region::dump_child_label, region::print_fields,
        map_region::print_fields, map_region::dump_dot_to_pp,
        map_region::dump_child_label, array_region::print_fields,
        array_region::dump_dot_to_pp): Don't use PUSH_IGNORE_WFORMAT or
        POP_IGNORE_WFORMAT.

2020-01-28  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93316
        * engine.cc (rewind_info_t::update_model): Get the longjmp call
        stmt via get_longjmp_call () rather than assuming it is the last
        stmt in the longjmp's supernode.
        (rewind_info_t::add_events_to_path): Get the location_t for the
        rewind_from_longjmp_event via get_longjmp_call () rather than from
        the supernode's get_end_location ().

2020-01-28  David Malcolm  <dmalcolm@redhat.com>

        * region-model.cc (poisoned_value_diagnostic::emit): Update for
        renaming of warning_at overload to warning_meta.
        * sm-file.cc (file_leak::emit): Likewise.
        * sm-malloc.cc (double_free::emit): Likewise.
        (possible_null_deref::emit): Likewise.
        (possible_null_arg::emit): Likewise.
        (null_deref::emit): Likewise.
        (null_arg::emit): Likewise.
        (use_after_free::emit): Likewise.
        (malloc_leak::emit): Likewise.
        (free_of_non_heap::emit): Likewise.
        * sm-sensitive.cc (exposure_through_output_file::emit): Likewise.
        * sm-signal.cc (signal_unsafe_call::emit): Likewise.
        * sm-taint.cc (tainted_array_index::emit): Likewise.

2020-01-27  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93451
        * region-model.cc (tree_cmp): For the REAL_CST case, impose an
        arbitrary order on NaNs relative to other NaNs and to non-NaNs;
        const-correctness tweak.
        (ana::selftests::build_real_cst_from_string): New function.
        (ana::selftests::append_interesting_constants): New function.
        (ana::selftests::test_tree_cmp_on_constants): New test.
        (ana::selftests::test_canonicalization_4): New test.
        (ana::selftests::analyzer_region_model_cc_tests): Call the new
        tests.

2020-01-27  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93349
        * engine.cc (run_checkers): Save and restore input_location.

2020-01-27  David Malcolm  <dmalcolm@redhat.com>

        * call-string.cc (call_string::cmp_1): Delete, moving body to...
        (call_string::cmp): ...here.
        * call-string.h (call_string::cmp_1): Delete decl.
        * engine.cc (worklist::key_t::cmp_1): Delete, moving body to...
        (worklist::key_t::cmp): ...here.  Implement hash comparisons
        via comparison rather than subtraction to avoid overflow issues.
        * exploded-graph.h (worklist::key_t::cmp_1): Delete decl.
        * region-model.cc (tree_cmp): Eliminate buggy checking for
        symmetry.

2020-01-27  David Malcolm  <dmalcolm@redhat.com>

        * analyzer.cc  (is_named_call_p): Check that fndecl is "extern"
        and at file scope.  Potentially disregard prefix _ or __ in
        fndecl's name.  Bail if the identifier is NULL.
        (is_setjmp_call_p): Expect a gcall rather than plain gimple.
        Remove special-case check for leading prefix, and also check for
        sigsetjmp.
        (is_longjmp_call_p): Also check for siglongjmp.
        (get_user_facing_name): New function.
        * analyzer.h (is_setjmp_call_p): Expect a gcall rather than plain
        gimple.
        (get_user_facing_name): New decl.
        * checker-path.cc (setjmp_event::get_desc): Use
        get_user_facing_name to avoid hardcoding the function name.
        (rewind_event::rewind_event): Add rewind_info param, using it to
        initialize new m_rewind_info field, and strengthen the assertion.
        (rewind_from_longjmp_event::get_desc): Use get_user_facing_name to
        avoid hardcoding the function name.
        (rewind_to_setjmp_event::get_desc): Likewise.
        * checker-path.h (setjmp_event::setjmp_event): Add setjmp_call
        param and use it to initialize...
        (setjmp_event::m_setjmp_call): New field.
        (rewind_event::rewind_event): Add rewind_info param.
        (rewind_event::m_rewind_info): New protected field.
        (rewind_from_longjmp_event::rewind_from_longjmp_event): Add
        rewind_info param.
        (class rewind_to_setjmp_event): Move rewind_info field to parent
        class.
        * diagnostic-manager.cc (diagnostic_manager::add_events_for_eedge):
        Update setjmp-handling for is_setjmp_call_p requiring a gcall;
        pass the call to the new setjmp_event.
        * engine.cc (exploded_node::on_stmt): Update for is_setjmp_call_p
        requiring a gcall.
        (stale_jmp_buf::emit): Use get_user_facing_name to avoid
        hardcoding the function names.
        (exploded_node::on_longjmp): Pass the longjmp_call when
        constructing rewind_info.
        (rewind_info_t::add_events_to_path): Pass the rewind_info_t to the
        rewind_from_longjmp_event's ctor.
        * exploded-graph.h (rewind_info_t::rewind_info_t): Add
        longjmp_call param.
        (rewind_info_t::get_longjmp_call): New.
        (rewind_info_t::m_longjmp_call): New.
        * region-model.cc (region_model::on_setjmp): Update comment to
        indicate this is also for sigsetjmp.
        * region-model.h (struct setjmp_record): Likewise.
        (class setjmp_svalue): Likewise.

2020-01-27  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93276
        * analyzer.h (PUSH_IGNORE_WFORMAT, POP_IGNORE_WFORMAT): Guard these
        macros with GCC_VERSION >= 4006, making them no-op otherwise.
        * engine.cc (exploded_edge::exploded_edge): Specify template for
        base class initializer.
        (exploded_graph::add_edge): Specify template when chaining up to
        base class add_edge implementation.
        (viz_callgraph_node::dump_dot): Drop redundant "typename".
        (viz_callgraph_edge::viz_callgraph_edge): Specify template for
        base class initializer.
        * program-state.cc (sm_state_map::clone_with_remapping): Drop
        redundant "typename".
        (sm_state_map::print): Likewise.
        (sm_state_map::hash): Likewise.
        (sm_state_map::operator==): Likewise.
        (sm_state_map::remap_svalue_ids): Likewise.
        (sm_state_map::on_svalue_purge): Likewise.
        (sm_state_map::validate): Likewise.
        * program-state.h (sm_state_map::iterator_t): Likewise.
        * supergraph.h (superedge::superedge): Specify template for base
        class initializer.

2020-01-23  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93375
        * supergraph.cc (callgraph_superedge::get_arg_for_parm): Fail
        gracefully is the number of parameters at the callee exceeds the
        number of arguments at the call stmt.
        (callgraph_superedge::get_parm_for_arg): Likewise.

2020-01-22  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93382
        * program-state.cc (sm_state_map::on_svalue_purge): If the
        entry survives, but the origin is being purged, then reset the
        origin to null.

2020-01-22  David Malcolm  <dmalcolm@redhat.com>

        * sm-signal.cc: Fix nesting of CHECKING_P and namespace ana.

2020-01-22  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93378
        * engine.cc (setjmp_svalue::compare_fields): Update for
        replacement of m_enode with m_setjmp_record.
        (setjmp_svalue::add_to_hash): Likewise.
        (setjmp_svalue::get_index): Rename...
        (setjmp_svalue::get_enode_index): ...to this.
        (setjmp_svalue::print_details): Update for replacement of m_enode
        with m_setjmp_record.
        (exploded_node::on_longjmp): Likewise.
        * exploded-graph.h (rewind_info_t::m_enode_origin): Replace...
        (rewind_info_t::m_setjmp_record): ...with this.
        (rewind_info_t::rewind_info_t): Update for replacement of m_enode
        with m_setjmp_record.
        (rewind_info_t::get_setjmp_point): Likewise.
        (rewind_info_t::get_setjmp_call): Likewise.
        * region-model.cc (region_model::dump_summary_of_map): Likewise.
        (region_model::on_setjmp): Likewise.
        * region-model.h (struct setjmp_record): New struct.
        (setjmp_svalue::m_enode): Replace...
        (setjmp_svalue::m_setjmp_record): ...with this.
        (setjmp_svalue::setjmp_svalue): Update for replacement of m_enode
        with m_setjmp_record.
        (setjmp_svalue::clone): Likewise.
        (setjmp_svalue::get_index): Rename...
        (setjmp_svalue::get_enode_index): ...to this.
        (setjmp_svalue::get_exploded_node): Replace...
        (setjmp_svalue::get_setjmp_record): ...with this.

2020-01-22  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93316
        * analyzer.cc (is_setjmp_call_p): Check for "setjmp" as well as
        "_setjmp".

2020-01-22  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93307
        * analysis-plan.h: Wrap everything namespace "ana".
        * analyzer-logging.cc: Likewise.
        * analyzer-logging.h: Likewise.
        * analyzer-pass.cc (pass_analyzer::execute): Update for "ana"
        namespace.
        * analyzer-selftests.cc: Wrap everything namespace "ana".
        * analyzer-selftests.h: Likewise.
        * analyzer.h: Likewise for forward decls of types.
        * call-string.h: Likewise.
        * checker-path.cc: Likewise.
        * checker-path.h: Likewise.
        * constraint-manager.cc: Likewise.
        * constraint-manager.h: Likewise.
        * diagnostic-manager.cc: Likewise.
        * diagnostic-manager.h: Likewise.
        * engine.cc: Likewise.
        * engine.h: Likewise.
        * exploded-graph.h: Likewise.
        * function-set.cc: Likewise.
        * function-set.h: Likewise.
        * pending-diagnostic.cc: Likewise.
        * pending-diagnostic.h: Likewise.
        * program-point.cc: Likewise.
        * program-point.h: Likewise.
        * program-state.cc: Likewise.
        * program-state.h: Likewise.
        * region-model.cc: Likewise.
        * region-model.h: Likewise.
        * sm-file.cc: Likewise.
        * sm-malloc.cc: Likewise.
        * sm-pattern-test.cc: Likewise.
        * sm-sensitive.cc: Likewise.
        * sm-signal.cc: Likewise.
        * sm-taint.cc: Likewise.
        * sm.cc: Likewise.
        * sm.h: Likewise.
        * state-purge.h: Likewise.
        * supergraph.cc: Likewise.
        * supergraph.h: Likewise.

2020-01-21  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93352
        * region-model.cc (int_cmp): Rename to...
        (array_region::key_cmp): ...this, using key_t rather than int.
        Rewrite in terms of comparisons rather than subtraction to
        ensure qsort is anti-symmetric when handling extreme values.
        (array_region::walk_for_canonicalization): Update for above
        renaming.
        * region-model.h (array_region::key_cmp): New decl.

2020-01-17  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93290
        * region-model.cc (region_model::eval_condition_without_cm): Avoid
        gcc_unreachable for unexpected operations for the case where
        we're comparing an svalue against itself.

2020-01-17  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93281
        * region-model.cc
        (region_model::convert_byte_offset_to_array_index): Convert to
        ssizetype before dividing by byte_size.  Use fold_binary rather
        than fold_build2 to avoid needlessly constructing a tree for the
        non-const case.

2020-01-15  David Malcolm  <dmalcolm@redhat.com>

        * engine.cc (class impl_region_model_context): Fix comment.

2020-01-14  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/93212
        * region-model.cc (make_region_for_type): Use
        FUNC_OR_METHOD_TYPE_P rather than comparing against FUNCTION_TYPE.
        * region-model.h (function_region::function_region): Likewise.

2020-01-14  David Malcolm  <dmalcolm@redhat.com>

        * program-state.cc (sm_state_map::clone_with_remapping): Copy
        m_global_state.
        (selftest::test_program_state_merging_2): New selftest.
        (selftest::analyzer_program_state_cc_tests): Call it.

2020-01-14  David Malcolm  <dmalcolm@redhat.com>

        * checker-path.h (checker_path::get_checker_event): New function.
        (checker_path): Add DISABLE_COPY_AND_ASSIGN; make fields private.
        * diagnostic-manager.cc
        (diagnostic_manager::prune_for_sm_diagnostic): Replace direct
        access to checker_path::m_events with accessor functions.  Fix
        overlong line.
        (diagnostic_manager::prune_interproc_events): Replace direct
        access to checker_path::m_events with accessor functions.
        (diagnostic_manager::finish_pruning): Likewise.

2020-01-14  David Malcolm  <dmalcolm@redhat.com>

        * checker-path.h (checker_event::clone): Delete vfunc decl.
        (debug_event::clone): Delete vfunc impl.
        (custom_event::clone): Delete vfunc impl.
        (statement_event::clone): Delete vfunc impl.
        (function_entry_event::clone): Delete vfunc impl.
        (state_change_event::clone): Delete vfunc impl.
        (start_cfg_edge_event::clone): Delete vfunc impl.
        (end_cfg_edge_event::clone): Delete vfunc impl.
        (call_event::clone): Delete vfunc impl.
        (return_event::clone): Delete vfunc impl.
        (setjmp_event::clone): Delete vfunc impl.
        (rewind_from_longjmp_event::clone): Delete vfunc impl.
        (rewind_to_setjmp_event::clone): Delete vfunc impl.
        (warning_event::clone): Delete vfunc impl.

2020-01-14  David Malcolm  <dmalcolm@redhat.com>

        * supergraph.cc (supernode::dump_dot): Ensure that the TABLE
        element has at least one TR.

2020-01-14  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/58237
        * engine.cc (leak_stmt_finder::find_stmt): Use get_pure_location
        when comparing against UNKNOWN_LOCATION.
        (stmt_requires_new_enode_p): Likewise.
        (exploded_graph::dump_exploded_nodes): Likewise.
        * supergraph.cc (supernode::get_start_location): Likewise.
        (supernode::get_end_location): Likewise.

2020-01-14  David Malcolm  <dmalcolm@redhat.com>

        PR analyzer/58237
        * analyzer-selftests.cc (selftest::run_analyzer_selftests): Call
        selftest::analyzer_sm_file_cc_tests.
        * analyzer-selftests.h (selftest::analyzer_sm_file_cc_tests): New
        decl.
        * sm-file.cc: Include "analyzer/function-set.h" and
        "analyzer/analyzer-selftests.h".
        (get_file_using_fns): New function.
        (is_file_using_fn_p): New function.
        (fileptr_state_machine::on_stmt): Return true for known functions.
        (selftest::analyzer_sm_file_cc_tests): New function.

2020-01-14  David Malcolm  <dmalcolm@redhat.com>

        * analyzer-selftests.cc (selftest::run_analyzer_selftests): Call
        selftest::analyzer_sm_signal_cc_tests.
        * analyzer-selftests.h (selftest::analyzer_sm_signal_cc_tests):
        New decl.
        * sm-signal.cc: Include "analyzer/function-set.h" and
        "analyzer/analyzer-selftests.h".
        (get_async_signal_unsafe_fns): New function.
        (signal_unsafe_p): Reimplement in terms of the above.
        (selftest::analyzer_sm_signal_cc_tests): New function.

2020-01-14  David Malcolm  <dmalcolm@redhat.com>

        * analyzer-selftests.cc (selftest::run_analyzer_selftests): Call
        selftest::analyzer_function_set_cc_tests.
        * analyzer-selftests.h (selftest::analyzer_function_set_cc_tests):
        New decl.
        * function-set.cc: New file.
        * function-set.h: New file.

2020-01-14  David Malcolm  <dmalcolm@redhat.com>

        * analyzer.h (fndecl_has_gimple_body_p): New decl.
        * engine.cc (impl_region_model_context::on_unknown_change): New
        function.
        (fndecl_has_gimple_body_p): Make non-static.
        (exploded_node::on_stmt): Treat __analyzer_dump_exploded_nodes as
        known.  Track whether we have a call with unknown side-effects and
        pass it to on_call_post.
        * exploded-graph.h (impl_region_model_context::on_unknown_change):
        New decl.
        * program-state.cc (sm_state_map::on_unknown_change): New function.
        * program-state.h (sm_state_map::on_unknown_change): New decl.
        * region-model.cc: Include "bitmap.h".
        (region_model::on_call_pre): Return a bool, capturing whether the
        call has unknown side effects.
        (region_model::on_call_post): Add arg "bool unknown_side_effects"
        and if true, call handle_unrecognized_call.
        (class reachable_regions): New class.
        (region_model::handle_unrecognized_call): New function.
        * region-model.h (region_model::on_call_pre): Return a bool.
        (region_model::on_call_post): Add arg "bool unknown_side_effects".
        (region_model::handle_unrecognized_call): New decl.
        (region_model_context::on_unknown_change): New vfunc.
        (test_region_model_context::on_unknown_change): New function.

2020-01-14  David Malcolm  <dmalcolm@redhat.com>

        * diagnostic-manager.cc (saved_diagnostic::operator==): Move here
        from header.  Replace pointer equality test on m_var with call to
        pending_diagnostic::same_tree_p.
        * diagnostic-manager.h (saved_diagnostic::operator==): Move to
        diagnostic-manager.cc.
        * pending-diagnostic.cc (pending_diagnostic::same_tree_p): New.
        * pending-diagnostic.h (pending_diagnostic::same_tree_p): New.
        * sm-file.cc (file_diagnostic::subclass_equal_p): Replace pointer
        equality on m_arg with call to pending_diagnostic::same_tree_p.
        * sm-malloc.cc (malloc_diagnostic::subclass_equal_p): Likewise.
        (possible_null_arg::subclass_equal_p): Likewise.
        (null_arg::subclass_equal_p): Likewise.
        (free_of_non_heap::subclass_equal_p): Likewise.
        * sm-pattern-test.cc (pattern_match::operator==): Likewise.
        * sm-sensitive.cc (exposure_through_output_file::operator==):
        Likewise.
        * sm-taint.cc (tainted_array_index::operator==): Likewise.

2020-01-14  David Malcolm  <dmalcolm@redhat.com>

        * diagnostic-manager.cc (dedupe_winners::add): Add logging
        of deduplication decisions made.

2020-01-14  David Malcolm  <dmalcolm@redhat.com>

        * ChangeLog: New file.
        * analyzer-selftests.cc: New file.
        * analyzer-selftests.h: New file.
        * analyzer.opt: New file.
        * analysis-plan.cc: New file.
        * analysis-plan.h: New file.
        * analyzer-logging.cc: New file.
        * analyzer-logging.h: New file.
        * analyzer-pass.cc: New file.
        * analyzer.cc: New file.
        * analyzer.h: New file.
        * call-string.cc: New file.
        * call-string.h: New file.
        * checker-path.cc: New file.
        * checker-path.h: New file.
        * constraint-manager.cc: New file.
        * constraint-manager.h: New file.
        * diagnostic-manager.cc: New file.
        * diagnostic-manager.h: New file.
        * engine.cc: New file.
        * engine.h: New file.
        * exploded-graph.h: New file.
        * pending-diagnostic.cc: New file.
        * pending-diagnostic.h: New file.
        * program-point.cc: New file.
        * program-point.h: New file.
        * program-state.cc: New file.
        * program-state.h: New file.
        * region-model.cc: New file.
        * region-model.h: New file.
        * sm-file.cc: New file.
        * sm-malloc.cc: New file.
        * sm-malloc.dot: New file.
        * sm-pattern-test.cc: New file.
        * sm-sensitive.cc: New file.
        * sm-signal.cc: New file.
        * sm-taint.cc: New file.
        * sm.cc: New file.
        * sm.h: New file.
        * state-purge.cc: New file.
        * state-purge.h: New file.
        * supergraph.cc: New file.
        * supergraph.h: New file.

2019-12-13  David Malcolm  <dmalcolm@redhat.com>

        * Initial creation

\f
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