make -fno-rtti the default unless a directory builds with REQUIRES_RTTI.

[oota-llvm.git] / lib / Transforms / Utils / ValueMapper.cpp

diff --git a/lib/Transforms/Utils/ValueMapper.cpp b/lib/Transforms/Utils/ValueMapper.cpp
index 39331d78169a36585b73dcac0ad049413f43ac13..a6e6701d0736535b99d96bc2f64e3502223de3c6 100644 (file)
--- a/lib/Transforms/Utils/ValueMapper.cpp
+++ b/lib/Transforms/Utils/ValueMapper.cpp
@@ -13,12 +13,11 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Transforms/Utils/ValueMapper.h"
-#include "llvm/DerivedTypes.h"  // For getNullValue(Type::Int32Ty)
+#include "llvm/Type.h"
 #include "llvm/Constants.h"
 #include "llvm/Function.h"
 #include "llvm/Metadata.h"
 #include "llvm/ADT/SmallVector.h"
-#include "llvm/Support/ErrorHandling.h"
 using namespace llvm;
 
 Value *llvm::MapValue(const Value *V, ValueMapTy &VM) {
@@ -28,11 +27,19 @@ Value *llvm::MapValue(const Value *V, ValueMapTy &VM) {
   // NOTE: VMSlot can be invalidated by any reference to VM, which can grow the
   // DenseMap.  This includes any recursive calls to MapValue.
 
-  // Global values and metadata do not need to be seeded into the ValueMap if 
-  // they are using the identity mapping.
-  if (isa<GlobalValue>(V) || isa<InlineAsm>(V) || isa<MetadataBase>(V))
+  // Global values and non-function-local metadata do not need to be seeded into
+  // the ValueMap if they are using the identity mapping.
+  if (isa<GlobalValue>(V) || isa<InlineAsm>(V) || isa<MDString>(V) ||
+      (isa<MDNode>(V) && !cast<MDNode>(V)->isFunctionLocal()))
     return VMSlot = const_cast<Value*>(V);
 
+  if (const MDNode *MD = dyn_cast<MDNode>(V)) {
+    SmallVector<Value*, 4> Elts;
+    for (unsigned i = 0; i != MD->getNumOperands(); i++)
+      Elts.push_back(MD->getOperand(i) ? MapValue(MD->getOperand(i), VM) : 0);
+    return VM[V] = MDNode::get(V->getContext(), Elts.data(), Elts.size());
+  }
+
   Constant *C = const_cast<Constant*>(dyn_cast<Constant>(V));
   if (C == 0) return 0;
   
@@ -111,14 +118,10 @@ Value *llvm::MapValue(const Value *V, ValueMapTy &VM) {
     return VM[V] = C;
   }
   
-  if (BlockAddress *BA = dyn_cast<BlockAddress>(C)) {
-    Function *F = cast<Function>(MapValue(BA->getFunction(), VM));
-    BasicBlock *BB = cast_or_null<BasicBlock>(MapValue(BA->getBasicBlock(),VM));
-    return VM[V] = BlockAddress::get(F, BB ? BB : BA->getBasicBlock());
-  }
-  
-  llvm_unreachable("Unknown type of constant!");
-  return 0;
+  BlockAddress *BA = cast<BlockAddress>(C);
+  Function *F = cast<Function>(MapValue(BA->getFunction(), VM));
+  BasicBlock *BB = cast_or_null<BasicBlock>(MapValue(BA->getBasicBlock(),VM));
+  return VM[V] = BlockAddress::get(F, BB ? BB : BA->getBasicBlock());
 }
 
 /// RemapInstruction - Convert the instruction operands from referencing the
@@ -131,3 +134,4 @@ void llvm::RemapInstruction(Instruction *I, ValueMapTy &ValueMap) {
     *op = V;
   }
 }
+