[SFN] boilerplate changes in preparation to introduce nonbind markers

[SFN] boilerplate changes in preparation to introduce nonbind markers

This patch introduces a number of new macros and functions that will
be used to distinguish between different kinds of debug stmts, insns
and notes, namely, preexisting debug bind ones and to-be-introduced
nonbind markers.

In a seemingly mechanical way, it adjusts several uses of the macros
and functions, so that they refer to narrower categories when
appropriate.

These changes, by themselves, should not have any visible effect in
the compiler behavior, since the upcoming debug markers are never
created with this patch alone.

for  gcc/ChangeLog

	* gimple.h (enum gimple_debug_subcode): Add
	GIMPLE_DEBUG_BEGIN_STMT.
	(gimple_debug_begin_stmt_p): New.
	(gimple_debug_nonbind_marker_p): New.
	* tree.h (MAY_HAVE_DEBUG_MARKER_STMTS): New.
	(MAY_HAVE_DEBUG_BIND_STMTS): Renamed from....
	(MAY_HAVE_DEBUG_STMTS): ... this.  Check both.
	* insn-notes.def (BEGIN_STMT): New.
	* rtl.h (MAY_HAVE_DEBUG_MARKER_INSNS): New.
	(MAY_HAVE_DEBUG_BIND_INSNS): Renamed from....
	(MAY_HAVE_DEBUG_INSNS): ... this.  Check both.
	(NOTE_MARKER_LOCATION, NOTE_MARKER_P): New.
	(DEBUG_BIND_INSN_P, DEBUG_MARKER_INSN_P): New.
	(INSN_DEBUG_MARKER_KIND): New.
	(GEN_RTX_DEBUG_MARKER_BEGIN_STMT_PAT): New.
	(INSN_VAR_LOCATION): Check for VAR_LOCATION.
	(INSN_VAR_LOCATION_PTR): New.
	* cfgexpand.c (expand_debug_locations): Handle debug bind insns
	only.
	(expand_gimple_basic_block): Likewise.  Emit debug temps for TER
	deps only if debug bind insns are enabled.
	(pass_expand::execute): Avoid deep TER and expand
	debug locations for debug bind insns only.
	* cgraph.c (cgraph_edge::redirect_call_stmt_to_callee): Narrow
	debug stmts special handling down to debug bind stmts.
	* combine.c (try_combine): Narrow debug insns special handling
	down to debug bind insns.
	* cse.c (delete_trivially_dead_insns): Handle debug bindings.
	Narrow debug insns preexisting special handling down to debug
	bind insns.
	* dce.c (rest_of_handle_ud_dce): Narrow debug insns special
	handling down to debug bind insns.
	* function.c (instantiate_virtual_regs): Skip debug markers,
	adjust handling of debug binds.
	* gimple-ssa-backprop.c (backprop::prepare_change): Try debug
	temp insertion iff MAY_HAVE_DEBUG_BIND_STMTS.
	* haifa-sched.c (schedule_insn): Narrow special handling of debug
	insns to debug bind insns.
	* ipa-param-manipulation.c (ipa_modify_call_arguments): Narrow
	special handling of debug stmts to debug bind stmts.
	* ipa-split.c (split_function): Likewise.
	* ira.c (combine_and_move_insns): Adjust debug bind insns only.
	* loop-unroll.c (apply_opt_in_copies): Adjust tests on bind
	debug insns.
	* reg-stack.c (convert_regs_1): Use DEBUG_BIND_INSN_P.
	* regrename.c (build_def_use): Likewise.
	* regcprop.c (copyprop_hardreg_forward_1): Likewise.
	(pass_cprop_hardreg): Narrow special casing of debug insns to
	debug bind insns.
	* regstat.c (regstat_init_n_sets_and_refs): Likewise.
	* reload1.c (reload): Likewise.
	* sese.c (sese_insert_phis_for_liveouts): Narrow special
	casing of debug stmts to debug bind stmts.
	* shrink-wrap.c (move_insn_for_shrink_wrap): Likewise.
	* ssa-iterators.h (num_imm_uses): Likewise.
	* tree-cfg.c (gimple_merge_blocks): Narrow special casing of
	debug stmts to debug bind stmts.
	* tree-inline.c	(tree_function_versioning): Narrow special casing
	of debug stmts to debug bind stmts.
	* tree-loop-distribution.c (generate_loops_for_partition):
	Narrow special casing of debug stmts to debug bind stmts.
	* tree-sra.c (analyze_access_subtree): Narrow special casing
	of debug stmts to debug bind stmts.
	* tree-ssa-dce.c (remove_dead_stmt): Narrow special casing of debug
	stmts to debug bind stmts.
	* tree-ssa-loop-ivopt.c (remove_unused_ivs): Narrow special
	casing of debug stmts to debug bind stmts.
	* tree-ssa-reassoc.c (reassoc_remove_stmt): Likewise.
	* tree-ssa-tail-merge.c (tail_merge_optimize): Narrow special
	casing of debug stmts to debug bind stmts.
	* tree-ssa-threadedge.c (propagate_threaded_block_debug_info):
	Likewise.
	* tree-ssa.c (flush_pending_stmts): Narrow special casing of
	debug stmts to debug bind stmts.
	(gimple_replace_ssa_lhs): Likewise.
	(insert_debug_temp_for_var_def): Likewise.
	(insert_debug_temps_for_defs): Likewise.
	(reset_debug_uses): Likewise.
	* tree-ssanames.c (release_ssa_name_fn): Likewise.
	* tree-vect-loop-manip.c (adjust_debug_stmts_now): Likewise.
	(adjust_debug_stmts): Likewise.
	(adjust_phi_and_debug_stmts): Likewise.
	(vect_do_peeling): Likewise.
	* tree-vect-loop.c (vect_transform_loop): Likewise.
	* valtrack.c (propagate_for_debug): Use BIND_DEBUG_INSN_P.
	* var-tracking.c (adjust_mems): Narrow special casing of debug
	insns to debug bind insns.
	(dv_onepart_p, dataflow_set_clar_at_call, use_type): Likewise.
	(compute_bb_dataflow, vt_find_locations): Likewise.
	(vt_expand_loc, emit_notes_for_changes): Likewise.
	(vt_init_cfa_base): Likewise.
	(vt_emit_notes): Likewise.
	(vt_initialize): Likewise.
	(vt_finalize): Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@255565 138bc75d-0d04-0410-961f-82ee72b054a4