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// Copyright 2012 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 x64 independent of OS goes here.
#if defined(__GNUC__) && !defined(__MINGW64__)
#include "src/third_party/valgrind/valgrind.h"
#endif
#if V8_TARGET_ARCH_X64
#include "src/codegen/cpu-features.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.
#ifdef VALGRIND_DISCARD_TRANSLATIONS
unsigned res = VALGRIND_DISCARD_TRANSLATIONS(start, size);
USE(res);
#endif
}
} // namespace internal
} // namespace v8
#endif // V8_TARGET_ARCH_X64
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