/js/src/yarr/OSAllocatorWin.cpp

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29
30#include "assembler/wtf/Platform.h"
31
32#if ENABLE_ASSEMBLER && WTF_OS_WINDOWS
33
34#include "windows.h"
35#include "wtf/Assertions.h"
36
37#include "OSAllocator.h"
38
39namespace WTF {
40
41static inline DWORD protection(bool writable, bool executable)
42{
43    return executable ?
44        (writable ? PAGE_EXECUTE_READWRITE : PAGE_EXECUTE_READ) :
45        (writable ? PAGE_READWRITE : PAGE_READONLY);
46}
47
48void* OSAllocator::reserveUncommitted(size_t bytes, Usage, bool writable, bool executable)
49{
50    void* result = VirtualAlloc(0, bytes, MEM_RESERVE, protection(writable, executable));
51    if (!result)
52        CRASH();
53    return result;
54}
55
56void* OSAllocator::reserveAndCommit(size_t bytes, Usage, bool writable, bool executable)
57{
58    void* result = VirtualAlloc(0, bytes, MEM_RESERVE | MEM_COMMIT, protection(writable, executable));
59    if (!result)
60        CRASH();
61    return result;
62}
63
64void OSAllocator::commit(void* address, size_t bytes, bool writable, bool executable)
65{
66    void* result = VirtualAlloc(address, bytes, MEM_COMMIT, protection(writable, executable));
67    if (!result)
68        CRASH();
69}
70
71void OSAllocator::decommit(void* address, size_t bytes)
72{
73    bool result = VirtualFree(address, bytes, MEM_DECOMMIT);
74    if (!result)
75        CRASH();
76}
77
78void OSAllocator::releaseDecommitted(void* address, size_t bytes)
79{
80    // According to http://msdn.microsoft.com/en-us/library/aa366892(VS.85).aspx,
81    // dwSize must be 0 if dwFreeType is MEM_RELEASE.
82    bool result = VirtualFree(address, 0, MEM_RELEASE);
83    if (!result)
84        CRASH();
85}
86
87} // namespace WTF
88
89#endif