Implement no_sanitize function attribute

2017-06-13  Martin Liska  <mliska@suse.cz>

	PR sanitize/78204
	* c-c++-common/ubsan/attrib-2.c (float_cast2): Enhance the
	test by adding no_sanitize attribute.
	* gcc.dg/asan/use-after-scope-4.c: Likewise.
2017-06-13  Martin Liska  <mliska@suse.cz>

	PR sanitize/78204
	* c-attribs.c (add_no_sanitize_value): New function.
	(handle_no_sanitize_attribute): Likewise.
	(handle_no_sanitize_address_attribute): Use the function.
	(handle_no_sanitize_thread_attribute): New function.
	(handle_no_address_safety_analysis_attribute): Use
	add_no_sanitize_value.
	(handle_no_sanitize_undefined_attribute): Likewise.
	* c-common.h: Declare new functions.
	* c-ubsan.c (ubsan_instrument_division): Use sanitize_flags_p.
	(ubsan_instrument_shift): Likewise.
	(ubsan_instrument_bounds): Likewise.
	(ubsan_maybe_instrument_array_ref): Likewise.
	(ubsan_maybe_instrument_reference_or_call): Likewise.
2017-06-13  Martin Liska  <mliska@suse.cz>

	PR sanitize/78204
	* asan.c (asan_sanitize_stack_p): Use sanitize_flags_p.
	(gate_asan): Likewise.
	* asan.h (asan_no_sanitize_address_p): Remove the function.
	(sanitize_flags_p): New function.
	* builtins.def: Fix coding style.
	* common.opt: Use renamed enum value.
	* convert.c (convert_to_integer_1): Use sanitize_flags_p.
	* doc/extend.texi: Document no_sanitize attribute.
	* flag-types.h (enum sanitize_code): Rename SANITIZE_NONDEFAULT
	to SANITIZE_UNDEFINED_NONDEFAULT.
	* gcc.c (sanitize_spec_function): Use the renamed enum value.
	* gimple-fold.c (optimize_atomic_compare_exchange_p):
	Use sanitize_flags_p.
	* gimplify.c (gimplify_function_tree): Likewise.
	* ipa-inline.c (sanitize_attrs_match_for_inline_p): Likewise.
	* opts.c (parse_no_sanitize_attribute): New function.
	(common_handle_option): Use renamed enum value.
	* opts.h (parse_no_sanitize_attribute): Declare.
	* tree.c (sanitize_flags_p): New function.
	* tree.h: Declared here.
	* tsan.c: Use sanitize_flags_p.
	* ubsan.c (ubsan_expand_null_ifn): Likewise.
	(instrument_mem_ref): Likewise.
	(instrument_bool_enum_load): Likewise.
	(do_ubsan_in_current_function): Remove the function.
	(pass_ubsan::execute): Use sanitize_flags_p.
	* ubsan.h: Remove do_ubsan_in_current_function
	* tree-cfg.c (print_no_sanitize_attr_value): New function.
	(dump_function_to_file): Use it here.
2017-06-13  Martin Liska  <mliska@suse.cz>

	PR sanitize/78204
	* class.c (build_base_path): Use sanitize_flags_p.
	* cp-gimplify.c (cp_genericize_r): Likewise.
	(cp_genericize_tree): Likewise.
	(cp_genericize): Likewise.
	* cp-ubsan.c (cp_ubsan_instrument_vptr_p): Likewise.
	* decl.c (compute_array_index_type): Likewise.
	(start_preparsed_function): Likewise.
	* decl2.c (one_static_initialization_or_destruction): Likewise.
	* init.c (finish_length_check): Likewise.
	* lambda.c (maybe_add_lambda_conv_op): Likewise.
	* typeck.c (cp_build_binary_op): Likewise.
	(build_static_cast_1): Likewise.
2017-06-13  Martin Liska  <mliska@suse.cz>

	PR sanitize/78204
	* c-convert.c (convert): Use sanitize_flags_p.
	* c-decl.c (grokdeclarator): Likewise.
	* c-typeck.c (convert_for_assignment): Likewise.
	(c_finish_return): Likewise.
	(build_binary_op): Likewise.

From-SVN: r249158

1 files changed, 20 insertions, 7 deletions

diff --git a/gcc/asan.h b/gcc/asan.h
index 57663977603..95bb89e197c 100644
--- a/gcc/asan.h
+++ b/gcc/asan.h
@@ -144,13 +144,6 @@ asan_sanitize_use_after_scope (void)
   return (flag_sanitize_address_use_after_scope && asan_sanitize_stack_p ());
 }
 
-static inline bool
-asan_no_sanitize_address_p (void)
-{
-  return lookup_attribute ("no_sanitize_address",
-			   DECL_ATTRIBUTES (current_function_decl));
-}
-
 /* Return true if DECL should be guarded on the stack.  */
 
 static inline bool
@@ -161,4 +154,24 @@ asan_protect_stack_decl (tree decl)
 	|| (asan_sanitize_use_after_scope () && TREE_ADDRESSABLE (decl)));
 }
 
+/* Return true when flag_sanitize & FLAG is non-zero.  If FN is non-null,
+   remove all flags mentioned in "no_sanitize" of DECL_ATTRIBUTES.  */
+
+static inline bool
+sanitize_flags_p (unsigned int flag, const_tree fn = current_function_decl)
+{
+  unsigned int result_flags = flag_sanitize & flag;
+  if (result_flags == 0)
+    return false;
+
+  if (fn != NULL_TREE)
+    {
+      tree value = lookup_attribute ("no_sanitize", DECL_ATTRIBUTES (fn));
+      if (value)
+	result_flags &= ~tree_to_uhwi (TREE_VALUE (value));
+    }
+
+  return result_flags;
+}
+
 #endif /* TREE_ASAN */