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Windows/Memory.inc: Support the ability to allocate memory "near" another block of memory on Win32. It has fixed FIXME.

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Thanks to Aaron Ballman!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142039 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
NAKAMURA Takumi 2011-10-15 01:58:16 +00:00
parent 513b1f47c1
commit c5c36765e6
1 changed files with 7 additions and 2 deletions
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9
lib/Support/Windows/Memory.inc
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@ -32,11 +32,16 @@ MemoryBlock Memory::AllocateRWX(size_t NumBytes,
static const size_t pageSize = Process::GetPageSize();
size_t NumPages = (NumBytes+pageSize-1)/pageSize;
//FIXME: support NearBlock if ever needed on Win64.
PVOID start = NearBlock ? static_cast<unsigned char *>(NearBlock->base()) +
NearBlock->size() : NULL;
void *pa = VirtualAlloc(NULL, NumPages*pageSize, MEM_COMMIT,
void *pa = VirtualAlloc(start, NumPages*pageSize, MEM_RESERVE | MEM_COMMIT,
PAGE_EXECUTE_READWRITE);
if (pa == NULL) {
if (NearBlock) {
// Try again without the NearBlock hint
return AllocateRWX(NumBytes, NULL, ErrMsg);
}
MakeErrMsg(ErrMsg, "Can't allocate RWX Memory: ");
return MemoryBlock();
}