llvm/lib/VMCore/Metadata.cpp

//===-- Metadata.cpp - Implement Metadata classes -------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the Metadata classes.
//
//===----------------------------------------------------------------------===//

#include "llvm/Metadata.h"
using namespace llvm;

//===----------------------------------------------------------------------===//
//MDNode implementation
//
MDNode::MDNode(Value*const* Vals, unsigned NumVals)
  : MetadataBase(Type::MetadataTy, Value::MDNodeVal) {
  for (unsigned i = 0; i != NumVals; ++i)
    Node.push_back(WeakVH(Vals[i]));
}

void MDNode::Profile(FoldingSetNodeID &ID) const {
  for (const_elem_iterator I = elem_begin(), E = elem_end(); I != E; ++I)
    ID.AddPointer(*I);
}

void MDNode::replaceElement(Value *From, Value *To) {
  SmallVector<Value*, 4> Values;
  Values.reserve(getNumElements());  // Build replacement array...
  for (unsigned i = 0, e = getNumElements(); i != e; ++i) {
    Value *Val = getElement(i);
    if (Val == From) Val = To;
    Values.push_back(Val);
  }

  MDNode *Replacement =
    getType()->getContext().getMDNode(&Values[0], Values.size());
  assert(Replacement != this && "I didn't contain From!");

  uncheckedReplaceAllUsesWith(Replacement);
}