2008-07-31 Jakub Jelinek <jakub@redhat.com>
+ PR c/36970
+ * builtins.c (maybe_emit_free_warning): New function.
+ (expand_builtin): Process BUILT_IN_FREE even at -O0. Call
+ maybe_emit_free_warning for BUILT_IN_FREE.
+
PR debug/36278
* dwarf2out.c (get_context_die): New function.
(force_decl_die, force_type_die): Use it.
enum built_in_function);
static void maybe_emit_chk_warning (tree, enum built_in_function);
static void maybe_emit_sprintf_chk_warning (tree, enum built_in_function);
+static void maybe_emit_free_warning (tree);
static tree fold_builtin_object_size (tree, tree);
static tree fold_builtin_strcat_chk (tree, tree, tree, tree);
static tree fold_builtin_strncat_chk (tree, tree, tree, tree, tree);
if (!optimize
&& !called_as_built_in (fndecl)
&& DECL_ASSEMBLER_NAME_SET_P (fndecl)
- && fcode != BUILT_IN_ALLOCA)
+ && fcode != BUILT_IN_ALLOCA
+ && fcode != BUILT_IN_FREE)
return expand_call (exp, target, ignore);
/* The built-in function expanders test for target == const0_rtx
maybe_emit_sprintf_chk_warning (exp, fcode);
break;
+ case BUILT_IN_FREE:
+ maybe_emit_free_warning (exp);
+ break;
+
default: /* just do library call, if unknown builtin */
break;
}
}
}
+/* Emit warning if a free is called with address of a variable. */
+
+static void
+maybe_emit_free_warning (tree exp)
+{
+ tree arg = CALL_EXPR_ARG (exp, 0);
+
+ STRIP_NOPS (arg);
+ if (TREE_CODE (arg) != ADDR_EXPR)
+ return;
+
+ arg = get_base_address (TREE_OPERAND (arg, 0));
+ if (arg == NULL || INDIRECT_REF_P (arg))
+ return;
+
+ if (SSA_VAR_P (arg))
+ warning (0, "%Kattempt to free a non-heap object %qD", exp, arg);
+ else
+ warning (0, "%Kattempt to free a non-heap object", exp);
+}
+
/* Fold a call to __builtin_object_size with arguments PTR and OST,
if possible. */
2008-07-31 Jakub Jelinek <jakub@redhat.com>
+ PR c/36970
+ * gcc.dg/free-1.c: New test.
+ * gcc.dg/free-2.c: New test.
+
PR debug/36278
* g++.dg/debug/namespace2.C: New test.
--- /dev/null
+/* PR c/36970 */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+extern void free (void *);
+
+char *p, buf3[10], d;
+struct S { char a; int b; } *r;
+
+void foo (void)
+{
+ char buf[10], buf2[10], c;
+ static char buf4[10], e;
+ char *q = buf;
+ free (p);
+ free (q); /* { dg-warning "attempt to free a non-heap object" } */
+ free (buf2); /* { dg-warning "attempt to free a non-heap object" } */
+ free (&c); /* { dg-warning "attempt to free a non-heap object" } */
+ free (buf3); /* { dg-warning "attempt to free a non-heap object" } */
+ free (&d); /* { dg-warning "attempt to free a non-heap object" } */
+ free (buf4); /* { dg-warning "attempt to free a non-heap object" } */
+ free (&e); /* { dg-warning "attempt to free a non-heap object" } */
+ free (&r->a);
+ free ("abcd"); /* { dg-warning "attempt to free a non-heap object" } */
+ free (L"abcd"); /* { dg-warning "attempt to free a non-heap object" } */
+}
--- /dev/null
+/* PR c/36970 */
+/* { dg-do compile } */
+/* { dg-options "-O0" } */
+
+extern void free (void *);
+
+char *p, buf3[10], d;
+struct S { char a; int b; } *r;
+
+void foo (void)
+{
+ char buf[10], buf2[10], c;
+ static char buf4[10], e;
+ char *q = buf;
+ free (p);
+ free (q); /* At -O0 no warning is reported here. */
+ free (buf2); /* { dg-warning "attempt to free a non-heap object" } */
+ free (&c); /* { dg-warning "attempt to free a non-heap object" } */
+ free (buf3); /* { dg-warning "attempt to free a non-heap object" } */
+ free (&d); /* { dg-warning "attempt to free a non-heap object" } */
+ free (buf4); /* { dg-warning "attempt to free a non-heap object" } */
+ free (&e); /* { dg-warning "attempt to free a non-heap object" } */
+ free (&r->a);
+ free ("abcd"); /* { dg-warning "attempt to free a non-heap object" } */
+ free (L"abcd"); /* { dg-warning "attempt to free a non-heap object" } */
+}