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// Copyright 2011 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// CPU specific code for x64 independent of OS goes here.
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#ifdef __GNUC__
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#include "third_party/valgrind/valgrind.h"
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#endif
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#include "v8.h"
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#if defined(V8_TARGET_ARCH_X64)
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#include "cpu.h"
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#include "macro-assembler.h"
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namespace v8 {
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namespace internal {
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void CPU::Setup() {
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CpuFeatures::Probe();
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}
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bool CPU::SupportsCrankshaft() {
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return true; // Yay!
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}
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void CPU::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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VALGRIND_DISCARD_TRANSLATIONS(start, size);
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#endif
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}
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void CPU::DebugBreak() {
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#ifdef _MSC_VER
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// To avoid Visual Studio runtime support the following code can be used
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// instead
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// __asm { int 3 }
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__debugbreak();
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#else
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asm("int $3");
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#endif
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}
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} } // namespace v8::internal
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#endif // V8_TARGET_ARCH_X64
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