Introduce a new temporary MDNode concept. Temporary MDNodes are
not part of the IR, are not uniqued, and may be safely RAUW'd.
This replaces a variety of alternate mechanisms for achieving
the same effect.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111681 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/VMCore/Metadata.cpp b/lib/VMCore/Metadata.cpp
index 442b5c5..236ddaa 100644
--- a/lib/VMCore/Metadata.cpp
+++ b/lib/VMCore/Metadata.cpp
@@ -20,6 +20,7 @@
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/SmallString.h"
#include "SymbolTableListTraitsImpl.h"
+#include "llvm/Support/LeakDetector.h"
#include "llvm/Support/ValueHandle.h"
using namespace llvm;
@@ -244,6 +245,28 @@
return getMDNode(Context, Vals, NumVals, FL_Unknown, false);
}
+MDNode *MDNode::getTemporary(LLVMContext &Context, Value *const *Vals,
+ unsigned NumVals) {
+ MDNode *N = (MDNode *)malloc(sizeof(MDNode)+NumVals*sizeof(MDNodeOperand));
+ N = new (N) MDNode(Context, Vals, NumVals, FL_No);
+ N->setValueSubclassData(N->getSubclassDataFromValue() |
+ NotUniquedBit);
+ LeakDetector::addGarbageObject(N);
+ return N;
+}
+
+void MDNode::deleteTemporary(MDNode *N) {
+ assert(N->use_empty() && "Temporary MDNode has uses!");
+ assert((N->getSubclassDataFromValue() & NotUniquedBit) &&
+ "Temporary MDNode does not have NotUniquedBit set!");
+ assert((N->getSubclassDataFromValue() & DestroyFlag) == 0 &&
+ "Temporary MDNode does has DestroyFlag set!");
+ N->setValueSubclassData(N->getSubclassDataFromValue() |
+ DestroyFlag);
+ LeakDetector::removeGarbageObject(N);
+ delete N;
+}
+
/// getOperand - Return specified operand.
Value *MDNode::getOperand(unsigned i) const {
return *getOperandPtr(const_cast<MDNode*>(this), i);