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Just like in regular escape analysis, loads and stores through

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(but not of) a block pointer do not cause the block pointer to
escape. This fixes rdar://10803830.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150424 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2012-02-13 22:57:02 +00:00
parent 60ebb1947f
commit a3b08d68bd
2 changed files with 61 additions and 0 deletions
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10
lib/Transforms/Scalar/ObjCARC.cpp
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@@ -618,11 +618,21 @@ static bool DoesObjCBlockEscape(const Value *BlockPtr) {
// to be an escape.
if (isa<CallInst>(UUser) || isa<InvokeInst>(UUser))
continue;
// Use by an instruction which copies the value is an escape if the
// result is an escape.
if (isa<BitCastInst>(UUser) || isa<GetElementPtrInst>(UUser) ||
isa<PHINode>(UUser) || isa<SelectInst>(UUser)) {
Worklist.push_back(UUser);
continue;
}
// Use by a load is not an escape.
if (isa<LoadInst>(UUser))
continue;
// Use by a store is not an escape if the use is the address.
if (const StoreInst *SI = dyn_cast<StoreInst>(UUser))
if (V != SI->getValueOperand())
continue;
// Otherwise, conservatively assume an escape.
return true;
}
} while (!Worklist.empty());