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153 lines
3.7 KiB
C++
153 lines
3.7 KiB
C++
/* -Wnonnull-compare warning support.
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Copyright (C) 2016-2024 Free Software Foundation, Inc.
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Contributed by Jakub Jelinek <jakub@redhat.com>
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "backend.h"
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#include "tree.h"
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#include "gimple.h"
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#include "tree-pass.h"
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#include "ssa.h"
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#include "diagnostic-core.h"
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#include "tree-dfa.h"
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/* Warn about comparison of nonnull_arg_p argument initial values
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with NULL. */
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static void
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do_warn_nonnull_compare (function *fun, tree arg)
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{
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if (!POINTER_TYPE_P (TREE_TYPE (arg))
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&& TREE_CODE (TREE_TYPE (arg)) != OFFSET_TYPE)
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return;
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if (!nonnull_arg_p (arg))
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return;
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tree d = ssa_default_def (fun, arg);
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if (d == NULL_TREE)
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return;
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use_operand_p use_p;
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imm_use_iterator iter;
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FOR_EACH_IMM_USE_FAST (use_p, iter, d)
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{
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gimple *stmt = USE_STMT (use_p);
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tree op = NULL_TREE;
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location_t loc = gimple_location (stmt);
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if (gimple_code (stmt) == GIMPLE_COND)
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switch (gimple_cond_code (stmt))
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{
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case EQ_EXPR:
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case NE_EXPR:
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if (gimple_cond_lhs (stmt) == d)
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op = gimple_cond_rhs (stmt);
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break;
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default:
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break;
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}
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else if (is_gimple_assign (stmt))
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switch (gimple_assign_rhs_code (stmt))
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{
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case EQ_EXPR:
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case NE_EXPR:
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if (gimple_assign_rhs1 (stmt) == d)
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op = gimple_assign_rhs2 (stmt);
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break;
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case COND_EXPR:
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switch (TREE_CODE (gimple_assign_rhs1 (stmt)))
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{
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case EQ_EXPR:
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case NE_EXPR:
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op = gimple_assign_rhs1 (stmt);
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if (TREE_OPERAND (op, 0) != d)
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{
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op = NULL_TREE;
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break;
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}
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loc = EXPR_LOC_OR_LOC (op, loc);
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op = TREE_OPERAND (op, 1);
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break;
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default:
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break;
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}
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break;
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default:
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break;
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}
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if (op
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&& (POINTER_TYPE_P (TREE_TYPE (arg))
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? integer_zerop (op) : integer_minus_onep (op))
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&& !warning_suppressed_p (stmt, OPT_Wnonnull_compare))
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warning_at (loc, OPT_Wnonnull_compare,
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"%<nonnull%> argument %qD compared to NULL", arg);
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}
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}
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namespace {
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const pass_data pass_data_warn_nonnull_compare =
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{
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GIMPLE_PASS, /* type */
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"*nonnullcmp", /* name */
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OPTGROUP_NONE, /* optinfo_flags */
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TV_NONE, /* tv_id */
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PROP_ssa, /* properties_required */
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0, /* properties_provided */
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0, /* properties_destroyed */
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0, /* todo_flags_start */
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0, /* todo_flags_finish */
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};
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class pass_warn_nonnull_compare : public gimple_opt_pass
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{
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public:
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pass_warn_nonnull_compare (gcc::context *ctxt)
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: gimple_opt_pass (pass_data_warn_nonnull_compare, ctxt)
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{}
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/* opt_pass methods: */
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bool gate (function *) final override { return warn_nonnull_compare; }
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unsigned int execute (function *) final override;
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}; // class pass_warn_nonnull_compare
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unsigned int
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pass_warn_nonnull_compare::execute (function *fun)
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{
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if (fun->static_chain_decl)
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do_warn_nonnull_compare (fun, fun->static_chain_decl);
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for (tree arg = DECL_ARGUMENTS (cfun->decl); arg; arg = DECL_CHAIN (arg))
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do_warn_nonnull_compare (fun, arg);
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return 0;
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}
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} // anon namespace
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gimple_opt_pass *
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make_pass_warn_nonnull_compare (gcc::context *ctxt)
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{
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return new pass_warn_nonnull_compare (ctxt);
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}
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