diff options
| author | Nikita Popov <npopov@redhat.com> | 2025-06-17 09:30:28 +0200 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2025-06-17 09:30:28 +0200 |
| commit | 80b79ce432bbe12701fd9fe495ff9feeb5e4b9ca (patch) | |
| tree | 76d8a32e64a80d2d670bcf48d873cc0b3748f588 /llvm/lib/Analysis/ConstantFolding.cpp | |
| parent | 7e6c1bd3edf4fc19be70587a4ac33a76bab78c02 (diff) | |
| download | llvm-80b79ce432bbe12701fd9fe495ff9feeb5e4b9ca.zip llvm-80b79ce432bbe12701fd9fe495ff9feeb5e4b9ca.tar.gz llvm-80b79ce432bbe12701fd9fe495ff9feeb5e4b9ca.tar.bz2 | |
[ConstantFolding] Handle reading from type padding (#144330)
ReadDataFromGlobal() did not handle reads from the padding of types (in
the sense of type store size != type alloc size, rather than struct
padding).
Return zero in that case.
Fixes https://github.com/llvm/llvm-project/issues/144279.
Diffstat (limited to 'llvm/lib/Analysis/ConstantFolding.cpp')
| -rw-r--r-- | llvm/lib/Analysis/ConstantFolding.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/Analysis/ConstantFolding.cpp b/llvm/lib/Analysis/ConstantFolding.cpp index 2b7a438..b58f9b2 100644 --- a/llvm/lib/Analysis/ConstantFolding.cpp +++ b/llvm/lib/Analysis/ConstantFolding.cpp @@ -432,6 +432,10 @@ bool ReadDataFromGlobal(Constant *C, uint64_t ByteOffset, unsigned char *CurPtr, assert(ByteOffset <= DL.getTypeAllocSize(C->getType()) && "Out of range access"); + // Reading type padding, return zero. + if (ByteOffset >= DL.getTypeStoreSize(C->getType())) + return true; + // If this element is zero or undefined, we can just return since *CurPtr is // zero initialized. if (isa<ConstantAggregateZero>(C) || isa<UndefValue>(C)) |