Initial checkin of Module cloning support stuff
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4788 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Utils/ValueMapper.cpp b/lib/Transforms/Utils/ValueMapper.cpp
new file mode 100644
index 0000000..e6ab297
--- /dev/null
+++ b/lib/Transforms/Utils/ValueMapper.cpp
@@ -0,0 +1,88 @@
+//===- ValueMapper.cpp - Interface shared by lib/Transforms/Utils ---------===//
+//
+// This file defines the MapValue function, which is shared by various parts of
+// the lib/Transforms/Utils library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "ValueMapper.h"
+#include "llvm/Constants.h"
+#include "llvm/Instruction.h"
+
+Value *MapValue(const Value *V, std::map<const Value*, Value*> &VM) {
+ Value *&VMSlot = VM[V];
+ if (VMSlot) return VMSlot; // Does it exist in the map yet?
+
+ if (Constant *C = (Constant*)dyn_cast<Constant>(V)) {
+ if (isa<ConstantIntegral>(C) || isa<ConstantFP>(C) ||
+ isa<ConstantPointerNull>(C))
+ return VMSlot = C; // Primitive constants map directly
+ else if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(C)) {
+ GlobalValue *MV = cast<GlobalValue>(MapValue((Value*)CPR->getValue(),VM));
+ return VMSlot = ConstantPointerRef::get(MV);
+ } else if (ConstantArray *CA = dyn_cast<ConstantArray>(C)) {
+ const std::vector<Use> &Vals = CA->getValues();
+ for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
+ Value *MV = MapValue(Vals[i], VM);
+ if (MV != Vals[i]) {
+ // This array must contain a reference to a global, make a new array
+ // and return it.
+ //
+ std::vector<Constant*> Values;
+ Values.reserve(Vals.size());
+ for (unsigned j = 0; j != i; ++j)
+ Values.push_back(cast<Constant>(Vals[j]));
+ Values.push_back(cast<Constant>(MV));
+ for (; i != e; ++i)
+ Values.push_back(cast<Constant>(MapValue(Vals[i], VM)));
+ return VMSlot = ConstantArray::get(CA->getType(), Values);
+ }
+ }
+ return VMSlot = C;
+
+ } else if (ConstantStruct *CS = dyn_cast<ConstantStruct>(C)) {
+ const std::vector<Use> &Vals = CS->getValues();
+ for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
+ Value *MV = MapValue(Vals[i], VM);
+ if (MV != Vals[i]) {
+ // This struct must contain a reference to a global, make a new struct
+ // and return it.
+ //
+ std::vector<Constant*> Values;
+ Values.reserve(Vals.size());
+ for (unsigned j = 0; j != i; ++j)
+ Values.push_back(cast<Constant>(Vals[j]));
+ Values.push_back(cast<Constant>(MV));
+ for (; i != e; ++i)
+ Values.push_back(cast<Constant>(MapValue(Vals[i], VM)));
+ return VMSlot = ConstantStruct::get(CS->getType(), Values);
+ }
+ }
+ return VMSlot = C;
+
+ } else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
+ if (CE->getOpcode() == Instruction::Cast) {
+ Constant *MV = cast<Constant>(MapValue(CE->getOperand(0), VM));
+ return VMSlot = ConstantExpr::getCast(MV, CE->getType());
+ } else if (CE->getOpcode() == Instruction::GetElementPtr) {
+ std::vector<Constant*> Idx;
+ Constant *MV = cast<Constant>(MapValue(CE->getOperand(0), VM));
+ for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i)
+ Idx.push_back(cast<Constant>(MapValue(CE->getOperand(i), VM)));
+ return VMSlot = ConstantExpr::getGetElementPtr(MV, Idx);
+ } else {
+ assert(CE->getNumOperands() == 2 && "Must be binary operator?");
+ Constant *MV1 = cast<Constant>(MapValue(CE->getOperand(0), VM));
+ Constant *MV2 = cast<Constant>(MapValue(CE->getOperand(1), VM));
+ return VMSlot = ConstantExpr::get(CE->getOpcode(), MV1, MV2);
+ }
+
+ } else {
+ assert(0 && "Unknown type of constant!");
+ }
+ }
+
+ assert(0 && "Unknown value type: why didn't it get resolved?!");
+ return 0;
+}
+