1 files changed, 141 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Transforms/Utils/ValueMapper.cpp b/contrib/llvm/lib/Transforms/Utils/ValueMapper.cpp
new file mode 100644
index 0000000..a73bf04
--- /dev/null
+++ b/contrib/llvm/lib/Transforms/Utils/ValueMapper.cpp
@@ -0,0 +1,141 @@
+//===- ValueMapper.cpp - Interface shared by lib/Transforms/Utils ---------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the MapValue function, which is shared by various parts of
+// the lib/Transforms/Utils library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Transforms/Utils/ValueMapper.h"
+#include "llvm/Type.h"
+#include "llvm/Constants.h"
+#include "llvm/Function.h"
+#include "llvm/Metadata.h"
+#include "llvm/ADT/SmallVector.h"
+using namespace llvm;
+
+Value *llvm::MapValue(const Value *V, ValueToValueMapTy &VM,
+                      RemapFlags Flags) {
+  ValueToValueMapTy::iterator I = VM.find(V);
+  
+  // If the value already exists in the map, use it.
+  if (I != VM.end() && I->second) return I->second;
+  
+  // Global values do not need to be seeded into the VM if they
+  // are using the identity mapping.
+  if (isa<GlobalValue>(V) || isa<InlineAsm>(V) || isa<MDString>(V))
+    return VM[V] = const_cast<Value*>(V);
+
+  if (const MDNode *MD = dyn_cast<MDNode>(V)) {
+    // If this is a module-level metadata and we know that nothing at the module
+    // level is changing, then use an identity mapping.
+    if (!MD->isFunctionLocal() && (Flags & RF_NoModuleLevelChanges))
+      return VM[V] = const_cast<Value*>(V);
+    
+    // Create a dummy node in case we have a metadata cycle.
+    MDNode *Dummy = MDNode::getTemporary(V->getContext(), ArrayRef<Value*>());
+    VM[V] = Dummy;
+    
+    // Check all operands to see if any need to be remapped.
+    for (unsigned i = 0, e = MD->getNumOperands(); i != e; ++i) {
+      Value *OP = MD->getOperand(i);
+      if (OP == 0 || MapValue(OP, VM, Flags) == OP) continue;
+
+      // Ok, at least one operand needs remapping.  
+      SmallVector<Value*, 4> Elts;
+      Elts.reserve(MD->getNumOperands());
+      for (i = 0; i != e; ++i) {
+        Value *Op = MD->getOperand(i);
+        Elts.push_back(Op ? MapValue(Op, VM, Flags) : 0);
+      }
+      MDNode *NewMD = MDNode::get(V->getContext(), Elts);
+      Dummy->replaceAllUsesWith(NewMD);
+      VM[V] = NewMD;
+      MDNode::deleteTemporary(Dummy);
+      return NewMD;
+    }
+
+    VM[V] = const_cast<Value*>(V);
+    MDNode::deleteTemporary(Dummy);
+
+    // No operands needed remapping.  Use an identity mapping.
+    return const_cast<Value*>(V);
+  }
+
+  // Okay, this either must be a constant (which may or may not be mappable) or
+  // is something that is not in the mapping table.
+  Constant *C = const_cast<Constant*>(dyn_cast<Constant>(V));
+  if (C == 0)
+    return 0;
+  
+  if (BlockAddress *BA = dyn_cast<BlockAddress>(C)) {
+    Function *F = cast<Function>(MapValue(BA->getFunction(), VM, Flags));
+    BasicBlock *BB = cast_or_null<BasicBlock>(MapValue(BA->getBasicBlock(), VM,
+                                                       Flags));
+    return VM[V] = BlockAddress::get(F, BB ? BB : BA->getBasicBlock());
+  }
+  
+  for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i) {
+    Value *Op = C->getOperand(i);
+    Value *Mapped = MapValue(Op, VM, Flags);
+    if (Mapped == C) continue;
+    
+    // Okay, the operands don't all match.  We've already processed some or all
+    // of the operands, set them up now.
+    std::vector<Constant*> Ops;
+    Ops.reserve(C->getNumOperands());
+    for (unsigned j = 0; j != i; ++j)
+      Ops.push_back(cast<Constant>(C->getOperand(i)));
+    Ops.push_back(cast<Constant>(Mapped));
+    
+    // Map the rest of the operands that aren't processed yet.
+    for (++i; i != e; ++i)
+      Ops.push_back(cast<Constant>(MapValue(C->getOperand(i), VM, Flags)));
+    
+    if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C))
+      return VM[V] = CE->getWithOperands(Ops);
+    if (ConstantArray *CA = dyn_cast<ConstantArray>(C))
+      return VM[V] = ConstantArray::get(CA->getType(), Ops);
+    if (ConstantStruct *CS = dyn_cast<ConstantStruct>(C))
+      return VM[V] = ConstantStruct::get(CS->getType(), Ops);
+    assert(isa<ConstantVector>(C) && "Unknown mapped constant type");
+    return VM[V] = ConstantVector::get(Ops);
+  }
+
+  // If we reach here, all of the operands of the constant match.
+  return VM[V] = C;
+}
+
+/// RemapInstruction - Convert the instruction operands from referencing the
+/// current values into those specified by VMap.
+///
+void llvm::RemapInstruction(Instruction *I, ValueToValueMapTy &VMap,
+                            RemapFlags Flags) {
+  // Remap operands.
+  for (User::op_iterator op = I->op_begin(), E = I->op_end(); op != E; ++op) {
+    Value *V = MapValue(*op, VMap, Flags);
+    // If we aren't ignoring missing entries, assert that something happened.
+    if (V != 0)
+      *op = V;
+    else
+      assert((Flags & RF_IgnoreMissingEntries) &&
+             "Referenced value not in value map!");
+  }
+
+  // Remap attached metadata.
+  SmallVector<std::pair<unsigned, MDNode *>, 4> MDs;
+  I->getAllMetadata(MDs);
+  for (SmallVectorImpl<std::pair<unsigned, MDNode *> >::iterator
+       MI = MDs.begin(), ME = MDs.end(); MI != ME; ++MI) {
+    Value *Old = MI->second;
+    Value *New = MapValue(Old, VMap, Flags);
+    if (New != Old)
+      I->setMetadata(MI->first, cast<MDNode>(New));
+  }
+}