gcc/analyzer/call-details.h

   1 /* Helper class for handling a call with specific arguments.
   2    Copyright (C) 2019-2023 Free Software Foundation, Inc.
   3    Contributed by David Malcolm <dmalcolm@redhat.com>.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it
   8 under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful, but
  13 WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef GCC_ANALYZER_CALL_DETAILS_H
  22 #define GCC_ANALYZER_CALL_DETAILS_H
  23
  24 namespace ana {
  25
  26 /* Helper class for handling calls to functions with known behavior.  */
  27
  28 class call_details
  29 {
  30 public:
  31   call_details (const gcall *call, region_model *model,
  32                 region_model_context *ctxt);
  33   call_details (const call_details &cd, region_model_context *ctxt);
  34
  35   region_model *get_model () const { return m_model; }
  36   region_model_manager *get_manager () const;
  37   region_model_context *get_ctxt () const { return m_ctxt; }
  38   logger *get_logger () const;
  39
  40   uncertainty_t *get_uncertainty () const;
  41   tree get_lhs_type () const { return m_lhs_type; }
  42   const region *get_lhs_region () const { return m_lhs_region; }
  43
  44   bool maybe_set_lhs (const svalue *result) const;
  45   void set_any_lhs_with_defaults () const;
  46
  47   unsigned num_args () const;
  48   bool arg_is_pointer_p (unsigned idx) const
  49   {
  50     return POINTER_TYPE_P (get_arg_type (idx));
  51   }
  52   bool arg_is_size_p (unsigned idx) const;
  53   bool arg_is_integral_p (unsigned idx) const
  54   {
  55     return INTEGRAL_TYPE_P (get_arg_type (idx));
  56   }
  57
  58   const gcall *get_call_stmt () const { return m_call; }
  59   location_t get_location () const;
  60
  61   tree get_arg_tree (unsigned idx) const;
  62   tree get_arg_type (unsigned idx) const;
  63   const svalue *get_arg_svalue (unsigned idx) const;
  64   const region *deref_ptr_arg (unsigned idx) const;
  65   const char *get_arg_string_literal (unsigned idx) const;
  66
  67   tree get_fndecl_for_call () const;
  68
  69   void dump_to_pp (pretty_printer *pp, bool simple) const;
  70   void dump (bool simple) const;
  71
  72   const svalue *get_or_create_conjured_svalue (const region *) const;
  73
  74   tree lookup_function_attribute (const char *attr_name) const;
  75
  76   void
  77   check_for_null_terminated_string_arg (unsigned arg_idx) const;
  78   const svalue *
  79   check_for_null_terminated_string_arg (unsigned arg_idx,
  80                                         bool include_terminator,
  81                                         const svalue **out_sval) const;
  82
  83   void
  84   complain_about_overlap (unsigned arg_idx_a,
  85                           unsigned arg_idx_b,
  86                           const svalue *num_bytes_read_sval) const;
  87
  88 private:
  89   const gcall *m_call;
  90   region_model *m_model;
  91   region_model_context *m_ctxt;
  92   tree m_lhs_type;
  93   const region *m_lhs_region;
  94 };
  95
  96 /* A bundle of information about a problematic argument at a callsite
  97    for use by pending_diagnostic subclasses for reporting and
  98    for deduplication.  */
  99
 100 struct call_arg_details
 101 {
 102 public:
 103   call_arg_details (const call_details &cd, unsigned arg_idx)
 104   : m_call (cd.get_call_stmt ()),
 105     m_called_fndecl (cd.get_fndecl_for_call ()),
 106     m_arg_idx (arg_idx),
 107     m_arg_expr (cd.get_arg_tree (arg_idx))
 108   {
 109   }
 110
 111   bool operator== (const call_arg_details &other) const
 112   {
 113     return (m_call == other.m_call
 114             && m_called_fndecl == other.m_called_fndecl
 115             && m_arg_idx == other.m_arg_idx
 116             && pending_diagnostic::same_tree_p (m_arg_expr, other.m_arg_expr));
 117   }
 118
 119   const gcall *m_call;
 120   tree m_called_fndecl;
 121   unsigned m_arg_idx; // 0-based
 122   tree m_arg_expr;
 123 };
 124
 125 } // namespace ana
 126
 127 #endif /* GCC_ANALYZER_CALL_DETAILS_H */