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cpu-x64.cc
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27 
28 // CPU specific code for x64 independent of OS goes here.
29 
30 #if defined(__GNUC__) && !defined(__MINGW64__)
31 #include "third_party/valgrind/valgrind.h"
32 #endif
33 
34 #include "v8.h"
35 
36 #if defined(V8_TARGET_ARCH_X64)
37 
38 #include "cpu.h"
39 #include "macro-assembler.h"
40 
41 namespace v8 {
42 namespace internal {
43 
44 void CPU::SetUp() {
46 }
47 
48 
50  return true; // Yay!
51 }
52 
53 
54 void 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 
76 void CPU::DebugBreak() {
77 #ifdef _MSC_VER
78  // To avoid Visual Studio runtime support the following code can be used
79  // instead
80  // __asm { int 3 }
81  __debugbreak();
82 #else
83  asm("int $3");
84 #endif
85 }
86 
87 } } // namespace v8::internal
88 
89 #endif // V8_TARGET_ARCH_X64
static bool SupportsCrankshaft()
void USE(T)
Definition: globals.h:289
static void FlushICache(void *start, size_t size)
static void DebugBreak()
static void SetUp()