blob: 22906b31bef832bbdc18b2308e89f28dc2edf838 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
// Copyright 2011 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 ia32 independent of OS goes here.
#ifdef __GNUC__
#include "src/third_party/valgrind/valgrind.h"
#endif
#if V8_TARGET_ARCH_X87
#include "src/assembler.h"
#include "src/macro-assembler.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_X87
|
