forked from OSchip/llvm-project
ad04914a53
Now ASan can return virtual memory to the underlying OS. Portable sanitizer runtime code needs to be aware that UnmapOrDie cannot unmap part of previous mapping. In particular, this required changing how we implement MmapAlignedOrDie on Windows, which is what Allocator32 uses. The new code first attempts to allocate memory of the given size, and if it is appropriately aligned, returns early. If not, it frees the memory and attempts to reserve size + alignment bytes. In this region there must be an aligned address. We then free the oversized mapping and request a new mapping at the aligned address immediately after. However, a thread could allocate that virtual address in between our free and allocation, so we have to retry if that allocation fails. The existing thread creation stress test managed to trigger this condition, so the code isn't totally untested. Reviewers: samsonov Differential Revision: http://reviews.llvm.org/D17431 llvm-svn: 263160 |
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| .. | ||
| BlocksRuntime | ||
| asan | ||
| builtins | ||
| cfi | ||
| dfsan | ||
| lsan | ||
| msan | ||
| profile | ||
| safestack | ||
| sanitizer_common | ||
| tsan | ||
| ubsan | ||
| CMakeLists.txt | ||
| lit.common.cfg | ||
| lit.common.configured.in | ||