1// Copyright 2011 the V8 project authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5// CPU specific code for ia32 independent of OS goes here. 6 7#ifdef __GNUC__ 8#include "src/third_party/valgrind/valgrind.h" 9#endif 10 11#include "src/v8.h" 12 13#if V8_TARGET_ARCH_IA32 14 15#include "src/assembler.h" 16#include "src/macro-assembler.h" 17 18namespace v8 { 19namespace internal { 20 21void CpuFeatures::FlushICache(void* start, size_t size) { 22 // No need to flush the instruction cache on Intel. On Intel instruction 23 // cache flushing is only necessary when multiple cores running the same 24 // code simultaneously. V8 (and JavaScript) is single threaded and when code 25 // is patched on an intel CPU the core performing the patching will have its 26 // own instruction cache updated automatically. 27 28 // If flushing of the instruction cache becomes necessary Windows has the 29 // API function FlushInstructionCache. 30 31 // By default, valgrind only checks the stack for writes that might need to 32 // invalidate already cached translated code. This leads to random 33 // instability when code patches or moves are sometimes unnoticed. One 34 // solution is to run valgrind with --smc-check=all, but this comes at a big 35 // performance cost. We can notify valgrind to invalidate its cache. 36#ifdef VALGRIND_DISCARD_TRANSLATIONS 37 unsigned res = VALGRIND_DISCARD_TRANSLATIONS(start, size); 38 USE(res); 39#endif 40} 41 42} } // namespace v8::internal 43 44#endif // V8_TARGET_ARCH_IA32 45