1 files changed, 88 insertions, 0 deletions
diff --git a/lib/Transforms/Utils/ValueMapper.cpp b/lib/Transforms/Utils/ValueMapper.cpp
new file mode 100644
index 0000000000..e6ab297428
--- /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;
+}
+