// Copyright 2011 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// CPU specific code for ia32 independent of OS goes here.
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#ifdef __GNUC__
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#include "src/third_party/valgrind/valgrind.h"
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#endif
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#if V8_TARGET_ARCH_IA32
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#include "src/assembler.h"
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#include "src/macro-assembler.h"
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namespace v8 {
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namespace internal {
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void CpuFeatures::FlushICache(void* start, size_t size) {
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// No need to flush the instruction cache on Intel. On Intel instruction
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// cache flushing is only necessary when multiple cores running the same
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// code simultaneously. V8 (and JavaScript) is single threaded and when code
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// is patched on an intel CPU the core performing the patching will have its
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// own instruction cache updated automatically.
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// If flushing of the instruction cache becomes necessary Windows has the
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// API function FlushInstructionCache.
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// By default, valgrind only checks the stack for writes that might need to
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// invalidate already cached translated code. This leads to random
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// instability when code patches or moves are sometimes unnoticed. One
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// solution is to run valgrind with --smc-check=all, but this comes at a big
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// performance cost. We can notify valgrind to invalidate its cache.
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#ifdef VALGRIND_DISCARD_TRANSLATIONS
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unsigned res = VALGRIND_DISCARD_TRANSLATIONS(start, size);
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USE(res);
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#endif
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}
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} // namespace internal
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} // namespace v8
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#endif // V8_TARGET_ARCH_IA32
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