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Bug fix in BumpPtrAllocator: don't assume that all objects have the same alignment. "Bump" of the pointer for the next allocated object to be of the specified alignment.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50362 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ted Kremenek 2008-04-28 17:58:07 +00:00
parent b20d4f8d49
commit c9715624fa
1 changed files with 9 additions and 6 deletions
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15
lib/Support/Allocator.cpp
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@ -46,13 +46,16 @@ public:
/// Allocate - Allocate and return at least the specified number of bytes.
///
void *Allocate(unsigned AllocSize, unsigned Alignment, MemRegion **RegPtr) {
// Round size up to an even multiple of the alignment.
AllocSize = (AllocSize+Alignment-1) & ~(Alignment-1);
// If there is space in this region, return it.
if (unsigned(NextPtr+AllocSize-(char*)this) <= RegionSize) {
void *Result = NextPtr;
NextPtr += AllocSize;
char* Result = (char*) (((uintptr_t) (NextPtr+Alignment-1))
& ~(Alignment-1));
// Speculate the new value of NextPtr.
char* NextPtrTmp = Result + AllocSize;
// If we are still within the current region, return Result.
if (unsigned (NextPtrTmp - (char*) this) <= RegionSize) {
NextPtr = NextPtrTmp;
return Result;
}