blob: 03816dff6b2c247f41c3ece8a609428adfcbf4e2 [file] [log] [blame]
// Copyright 2011 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// CPU specific code for ia32 independent of OS goes here.
#ifdef __GNUC__
#include "src/third_party/valgrind/valgrind.h"
#include "src/v8.h"
#include "src/assembler.h"
#include "src/macro-assembler.h"
namespace v8 {
namespace internal {
void CpuFeatures::FlushICache(void* start, size_t size) {
// No need to flush the instruction cache on Intel. On Intel instruction
// cache flushing is only necessary when multiple cores running the same
// code simultaneously. V8 (and JavaScript) is single threaded and when code
// is patched on an intel CPU the core performing the patching will have its
// own instruction cache updated automatically.
// If flushing of the instruction cache becomes necessary Windows has the
// API function FlushInstructionCache.
// By default, valgrind only checks the stack for writes that might need to
// invalidate already cached translated code. This leads to random
// instability when code patches or moves are sometimes unnoticed. One
// solution is to run valgrind with --smc-check=all, but this comes at a big
// performance cost. We can notify valgrind to invalidate its cache.
unsigned res = VALGRIND_DISCARD_TRANSLATIONS(start, size);
} } // namespace v8::internal
#endif // V8_TARGET_ARCH_X87