diff options
| -rw-r--r-- | docs/GarbageCollection.html | 7 | ||||
| -rw-r--r-- | lib/Transforms/Scalar/LowerGC.cpp | 5 |
2 files changed, 5 insertions, 7 deletions
diff --git a/docs/GarbageCollection.html b/docs/GarbageCollection.html index 0accd0c..e39e85c 100644 --- a/docs/GarbageCollection.html +++ b/docs/GarbageCollection.html @@ -166,9 +166,7 @@ interface that front-end authors should generate code for. The <tt>llvm.gcroot</tt> intrinsic is used to inform LLVM of a pointer variable on the stack. The first argument contains the address of the variable on the stack, and the second contains a pointer to metadata that should be associated -with the pointer (which <b>must</b> be a constant or global value address). At -runtime, the <tt>llvm.gcroot</tt> intrinsic stores a null pointer into the -specified location to initialize the pointer.</p> +with the pointer (which <b>must</b> be a constant or global value address).</p> <p> Consider the following fragment of Java code: @@ -193,6 +191,9 @@ Entry: %X = alloca %Object* ... + ;; Java null-initializes pointers. + store %Object* null, %Object** %X + ;; "CodeBlock" is the block corresponding to the start ;; of the scope above. CodeBlock: diff --git a/lib/Transforms/Scalar/LowerGC.cpp b/lib/Transforms/Scalar/LowerGC.cpp index 9807099..bac7ac7 100644 --- a/lib/Transforms/Scalar/LowerGC.cpp +++ b/lib/Transforms/Scalar/LowerGC.cpp @@ -284,10 +284,7 @@ bool LowerGC::runOnFunction(Function &F) { new StoreInst(Null, RootPtrPtr, IP); // Each occurrance of the llvm.gcroot intrinsic now turns into an - // initialization of the slot with the address and a zeroing out of the - // address specified. - new StoreInst(Constant::getNullValue(PtrLocTy->getElementType()), - GCRoots[i]->getOperand(1), GCRoots[i]); + // initialization of the slot with the address. new StoreInst(GCRoots[i]->getOperand(1), RootPtrPtr, GCRoots[i]); } |