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Update GC intrinsics to take a pointer to the object as well as a pointer

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to the field being updated.  Patch contributed by Tobias Nurmiranta


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15097 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-07-22 05:51:13 +00:00
parent 9545a1797b
commit 93c9587fbb
3 changed files with 12 additions and 9 deletions
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13
lib/Transforms/Scalar/LowerGC.cpp
View File

@ -109,10 +109,10 @@ bool LowerGC::doInitialization(Module &M) {
// If the program is using read/write barriers, find the implementations of
// them from the GC runtime library.
if (GCReadInt) // Make: sbyte* %llvm_gc_read(sbyte**)
GCRead = M.getOrInsertFunction("llvm_gc_read", VoidPtr, VoidPtrPtr, 0);
GCRead = M.getOrInsertFunction("llvm_gc_read", VoidPtr, VoidPtr, VoidPtrPtr, 0);
if (GCWriteInt) // Make: void %llvm_gc_write(sbyte*, sbyte**)
GCWrite = M.getOrInsertFunction("llvm_gc_write", Type::VoidTy,
VoidPtr, VoidPtrPtr, 0);
VoidPtr, VoidPtr, VoidPtrPtr, 0);
// If the program has GC roots, get or create the global root list.
if (GCRootInt) {
@ -182,14 +182,17 @@ bool LowerGC::runOnFunction(Function &F) {
CI->setOperand(0, GCWrite);
// Insert casts of the operands as needed.
Coerce(CI, 1, VoidPtr);
Coerce(CI, 2, VoidPtrPtr);
Coerce(CI, 2, VoidPtr);
Coerce(CI, 3, VoidPtrPtr);
} else {
Coerce(CI, 1, VoidPtrPtr);
Coerce(CI, 1, VoidPtr);
Coerce(CI, 2, VoidPtrPtr);
if (CI->getType() == VoidPtr) {
CI->setOperand(0, GCRead);
} else {
// Create a whole new call to replace the old one.
CallInst *NC = new CallInst(GCRead, CI->getOperand(1),
CallInst *NC = new CallInst(GCRead, CI->getOperand(1),
CI->getOperand(2),
CI->getName(), CI);
Value *NV = new CastInst(NC, CI->getType(), "", CI);
CI->replaceAllUsesWith(NV);

4
runtime/GC/GCInterface.h
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@ -38,11 +38,11 @@ void llvm_gc_collect();
/* llvm_gc_read - This function should be implemented to include any read
* barrier code that is needed by the garbage collector.
*/
void *llvm_gc_read(void **P);
void *llvm_gc_read(void *ObjPtr, void **FieldPtr);
/* llvm_gc_write - This function should be implemented to include any write
* barrier code that is needed by the garbage collector.
*/
void llvm_gc_write(void *V, void **P);
void llvm_gc_write(void *V, void *ObjPtr, void **FieldPtr);
#endif

4
runtime/GC/SemiSpace/semispace.c
View File

@ -89,8 +89,8 @@ void llvm_gc_collect() {
}
/* We use no read/write barriers */
void *llvm_gc_read(void **P) { return *P; }
void llvm_gc_write(void *V, void **P) { *P = V; }
void *llvm_gc_read(void *ObjPtr, void **FieldPtr) { return *FieldPtr; }
void llvm_gc_write(void *V, void *ObjPtr, void **FieldPtr) { *FieldPtr = V; }
/*===----------------------------------------------------------------------===**