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Fix a gcroot lowering bug. 

llvm-svn: 41668
This commit is contained in:
Evan Cheng 2007-09-01 02:00:51 +00:00
parent 53cacaec46
commit ffac17a223
2 changed files with 15 additions and 2 deletions
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7
llvm/lib/Transforms/Scalar/LowerGC.cpp
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@ -262,7 +262,7 @@ bool LowerGC::runOnFunction(Function &F) {
cast<PointerType>(GCRootInt->getFunctionType()->getParamType(0));
Constant *Null = ConstantPointerNull::get(PtrLocTy);
// Initialize all of the gcroot records now, and eliminate them as we go.
// Initialize all of the gcroot records now.
for (unsigned i = 0, e = GCRoots.size(); i != e; ++i) {
// Initialize the meta-data pointer.
Par[2] = ConstantInt::get(Type::Int32Ty, i);
@ -282,7 +282,6 @@ bool LowerGC::runOnFunction(Function &F) {
new StoreInst(Constant::getNullValue(PtrLocTy->getElementType()),
GCRoots[i]->getOperand(1), GCRoots[i]);
new StoreInst(GCRoots[i]->getOperand(1), RootPtrPtr, GCRoots[i]);
GCRoots[i]->getParent()->getInstList().erase(GCRoots[i]);
}
// Now that the record is all initialized, store the pointer into the global
@ -290,6 +289,10 @@ bool LowerGC::runOnFunction(Function &F) {
Value *C = new BitCastInst(AI, PointerType::get(MainRootRecordType), "", IP);
new StoreInst(C, RootChain, IP);
// Eliminate all the gcroot records now.
for (unsigned i = 0, e = GCRoots.size(); i != e; ++i)
GCRoots[i]->getParent()->getInstList().erase(GCRoots[i]);
// On exit from the function we have to remove the entry from the GC root
// chain. Doing this is straight-forward for return and unwind instructions:
// just insert the appropriate copy.

10
llvm/test/CodeGen/Generic/GC/lower_gcroot.ll Normal file
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@ -0,0 +1,10 @@
; RUN: llvm-as < %s | llc
%Env = type opaque*
define void @.main(%Env) {
call void @llvm.gcroot( %Env* null, %Env null )
unreachable
}
declare void @llvm.gcroot(%Env*, %Env)