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Add MDNode::getIfExists(), an efficient way to determine if a value is used by metadata (since metadata does not appear in a value's use list) 

llvm-svn: 94492
This commit is contained in:
Victor Hernandez 2010-01-26 02:36:35 +00:00
parent 907bdbb6be
commit 7e8ce9afbc
2 changed files with 45 additions and 30 deletions
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5
llvm/include/llvm/Metadata.h
View File

@ -112,7 +112,7 @@ protected:
bool isFunctionLocal);
static MDNode *getMDNode(LLVMContext &C, Value *const *Vals, unsigned NumVals,
FunctionLocalness FL);
FunctionLocalness FL, bool Insert = true);
public:
// Constructors and destructors.
static MDNode *get(LLVMContext &Context, Value *const *Vals,
@ -122,6 +122,9 @@ public:
static MDNode *getWhenValsUnresolved(LLVMContext &Context, Value *const *Vals,
unsigned NumVals, bool isFunctionLocal);
static MDNode *getIfExists(LLVMContext &Context, Value *const *Vals,
unsigned NumVals);
/// getOperand - Return specified operand.
Value *getOperand(unsigned i) const;

20
llvm/lib/VMCore/Metadata.cpp
View File

@ -186,15 +186,22 @@ void MDNode::destroy() {
}
MDNode *MDNode::getMDNode(LLVMContext &Context, Value *const *Vals,
unsigned NumVals, FunctionLocalness FL) {
unsigned NumVals, FunctionLocalness FL,
bool Insert) {
LLVMContextImpl *pImpl = Context.pImpl;
FoldingSetNodeID ID;
for (unsigned i = 0; i != NumVals; ++i)
ID.AddPointer(Vals[i]);
void *InsertPoint;
MDNode *N = pImpl->MDNodeSet.FindNodeOrInsertPos(ID, InsertPoint);
if (!N) {
MDNode *N = NULL;
if ((N = pImpl->MDNodeSet.FindNodeOrInsertPos(ID, InsertPoint)))
return N;
if (!Insert)
return NULL;
bool isFunctionLocal = false;
switch (FL) {
case FL_Unknown:
@ -222,7 +229,7 @@ MDNode *MDNode::getMDNode(LLVMContext &Context, Value *const *Vals,
// InsertPoint will have been set by the FindNodeOrInsertPos call.
pImpl->MDNodeSet.InsertNode(N, InsertPoint);
}
return N;
}
@ -235,6 +242,11 @@ MDNode *MDNode::getWhenValsUnresolved(LLVMContext &Context, Value*const* Vals,
return getMDNode(Context, Vals, NumVals, isFunctionLocal ? FL_Yes : FL_No);
}
MDNode *MDNode::getIfExists(LLVMContext &Context, Value *const *Vals,
unsigned NumVals) {
return getMDNode(Context, Vals, NumVals, FL_Unknown, false);
}
/// getOperand - Return specified operand.
Value *MDNode::getOperand(unsigned i) const {
return *getOperandPtr(const_cast<MDNode*>(this), i);