1// Copyright 2011 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
6//     * Redistributions of source code must retain the above copyright
7//       notice, this list of conditions and the following disclaimer.
8//     * Redistributions in binary form must reproduce the above
9//       copyright notice, this list of conditions and the following
10//       disclaimer in the documentation and/or other materials provided
11//       with the distribution.
12//     * Neither the name of Google Inc. nor the names of its
13//       contributors may be used to endorse or promote products derived
14//       from this software without specific prior written permission.
15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28// CPU specific code for ia32 independent of OS goes here.
29
30#ifdef __GNUC__
31#include "third_party/valgrind/valgrind.h"
32#endif
33
34#include "v8.h"
35
36#if V8_TARGET_ARCH_IA32
37
38#include "cpu.h"
39#include "macro-assembler.h"
40
41namespace v8 {
42namespace internal {
43
44void CPU::SetUp() {
45  CpuFeatures::Probe();
46}
47
48
49bool CPU::SupportsCrankshaft() {
50  return CpuFeatures::IsSupported(SSE2);
51}
52
53
54void CPU::FlushICache(void* start, size_t size) {
55  // No need to flush the instruction cache on Intel. On Intel instruction
56  // cache flushing is only necessary when multiple cores running the same
57  // code simultaneously. V8 (and JavaScript) is single threaded and when code
58  // is patched on an intel CPU the core performing the patching will have its
59  // own instruction cache updated automatically.
60
61  // If flushing of the instruction cache becomes necessary Windows has the
62  // API function FlushInstructionCache.
63
64  // By default, valgrind only checks the stack for writes that might need to
65  // invalidate already cached translated code.  This leads to random
66  // instability when code patches or moves are sometimes unnoticed.  One
67  // solution is to run valgrind with --smc-check=all, but this comes at a big
68  // performance cost.  We can notify valgrind to invalidate its cache.
69#ifdef VALGRIND_DISCARD_TRANSLATIONS
70  unsigned res = VALGRIND_DISCARD_TRANSLATIONS(start, size);
71  USE(res);
72#endif
73}
74
75} }  // namespace v8::internal
76
77#endif  // V8_TARGET_ARCH_IA32
78