forked from OSchip/llvm-project
201 lines
7.4 KiB
C++
201 lines
7.4 KiB
C++
//===- ValueMapper.cpp - Interface shared by lib/Transforms/Utils ---------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the MapValue function, which is shared by various parts of
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// the lib/Transforms/Utils library.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/Utils/ValueMapper.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/InlineAsm.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/Metadata.h"
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using namespace llvm;
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// Out of line method to get vtable etc for class.
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void ValueMapTypeRemapper::anchor() {}
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Value *llvm::MapValue(const Value *V, ValueToValueMapTy &VM, RemapFlags Flags,
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ValueMapTypeRemapper *TypeMapper) {
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ValueToValueMapTy::iterator I = VM.find(V);
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// If the value already exists in the map, use it.
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if (I != VM.end() && I->second) return I->second;
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// Global values do not need to be seeded into the VM if they
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// are using the identity mapping.
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if (isa<GlobalValue>(V) || isa<MDString>(V))
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return VM[V] = const_cast<Value*>(V);
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if (const InlineAsm *IA = dyn_cast<InlineAsm>(V)) {
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// Inline asm may need *type* remapping.
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FunctionType *NewTy = IA->getFunctionType();
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if (TypeMapper) {
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NewTy = cast<FunctionType>(TypeMapper->remapType(NewTy));
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if (NewTy != IA->getFunctionType())
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V = InlineAsm::get(NewTy, IA->getAsmString(), IA->getConstraintString(),
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IA->hasSideEffects(), IA->isAlignStack());
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}
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return VM[V] = const_cast<Value*>(V);
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}
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if (const MDNode *MD = dyn_cast<MDNode>(V)) {
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// If this is a module-level metadata and we know that nothing at the module
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// level is changing, then use an identity mapping.
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if (!MD->isFunctionLocal() && (Flags & RF_NoModuleLevelChanges))
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return VM[V] = const_cast<Value*>(V);
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// Create a dummy node in case we have a metadata cycle.
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MDNode *Dummy = MDNode::getTemporary(V->getContext(), ArrayRef<Value*>());
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VM[V] = Dummy;
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// Check all operands to see if any need to be remapped.
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for (unsigned i = 0, e = MD->getNumOperands(); i != e; ++i) {
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Value *OP = MD->getOperand(i);
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if (OP == 0 || MapValue(OP, VM, Flags, TypeMapper) == OP) continue;
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// Ok, at least one operand needs remapping.
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SmallVector<Value*, 4> Elts;
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Elts.reserve(MD->getNumOperands());
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for (i = 0; i != e; ++i) {
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Value *Op = MD->getOperand(i);
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Elts.push_back(Op ? MapValue(Op, VM, Flags, TypeMapper) : 0);
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}
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MDNode *NewMD = MDNode::get(V->getContext(), Elts);
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Dummy->replaceAllUsesWith(NewMD);
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VM[V] = NewMD;
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MDNode::deleteTemporary(Dummy);
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return NewMD;
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}
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VM[V] = const_cast<Value*>(V);
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MDNode::deleteTemporary(Dummy);
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// No operands needed remapping. Use an identity mapping.
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return const_cast<Value*>(V);
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}
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// Okay, this either must be a constant (which may or may not be mappable) or
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// is something that is not in the mapping table.
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Constant *C = const_cast<Constant*>(dyn_cast<Constant>(V));
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if (C == 0)
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return 0;
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if (BlockAddress *BA = dyn_cast<BlockAddress>(C)) {
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Function *F =
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cast<Function>(MapValue(BA->getFunction(), VM, Flags, TypeMapper));
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BasicBlock *BB = cast_or_null<BasicBlock>(MapValue(BA->getBasicBlock(), VM,
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Flags, TypeMapper));
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return VM[V] = BlockAddress::get(F, BB ? BB : BA->getBasicBlock());
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}
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// Otherwise, we have some other constant to remap. Start by checking to see
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// if all operands have an identity remapping.
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unsigned OpNo = 0, NumOperands = C->getNumOperands();
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Value *Mapped = 0;
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for (; OpNo != NumOperands; ++OpNo) {
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Value *Op = C->getOperand(OpNo);
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Mapped = MapValue(Op, VM, Flags, TypeMapper);
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if (Mapped != C) break;
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}
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// See if the type mapper wants to remap the type as well.
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Type *NewTy = C->getType();
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if (TypeMapper)
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NewTy = TypeMapper->remapType(NewTy);
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// If the result type and all operands match up, then just insert an identity
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// mapping.
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if (OpNo == NumOperands && NewTy == C->getType())
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return VM[V] = C;
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// Okay, we need to create a new constant. We've already processed some or
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// all of the operands, set them all up now.
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SmallVector<Constant*, 8> Ops;
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Ops.reserve(NumOperands);
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for (unsigned j = 0; j != OpNo; ++j)
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Ops.push_back(cast<Constant>(C->getOperand(j)));
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// If one of the operands mismatch, push it and the other mapped operands.
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if (OpNo != NumOperands) {
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Ops.push_back(cast<Constant>(Mapped));
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// Map the rest of the operands that aren't processed yet.
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for (++OpNo; OpNo != NumOperands; ++OpNo)
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Ops.push_back(MapValue(cast<Constant>(C->getOperand(OpNo)), VM,
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Flags, TypeMapper));
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}
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if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C))
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return VM[V] = CE->getWithOperands(Ops, NewTy);
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if (isa<ConstantArray>(C))
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return VM[V] = ConstantArray::get(cast<ArrayType>(NewTy), Ops);
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if (isa<ConstantStruct>(C))
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return VM[V] = ConstantStruct::get(cast<StructType>(NewTy), Ops);
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if (isa<ConstantVector>(C))
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return VM[V] = ConstantVector::get(Ops);
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// If this is a no-operand constant, it must be because the type was remapped.
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if (isa<UndefValue>(C))
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return VM[V] = UndefValue::get(NewTy);
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if (isa<ConstantAggregateZero>(C))
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return VM[V] = ConstantAggregateZero::get(NewTy);
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assert(isa<ConstantPointerNull>(C));
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return VM[V] = ConstantPointerNull::get(cast<PointerType>(NewTy));
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}
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/// RemapInstruction - Convert the instruction operands from referencing the
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/// current values into those specified by VMap.
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///
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void llvm::RemapInstruction(Instruction *I, ValueToValueMapTy &VMap,
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RemapFlags Flags, ValueMapTypeRemapper *TypeMapper){
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// Remap operands.
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for (User::op_iterator op = I->op_begin(), E = I->op_end(); op != E; ++op) {
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Value *V = MapValue(*op, VMap, Flags, TypeMapper);
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// If we aren't ignoring missing entries, assert that something happened.
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if (V != 0)
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*op = V;
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else
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assert((Flags & RF_IgnoreMissingEntries) &&
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"Referenced value not in value map!");
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}
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// Remap phi nodes' incoming blocks.
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if (PHINode *PN = dyn_cast<PHINode>(I)) {
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for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i) {
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Value *V = MapValue(PN->getIncomingBlock(i), VMap, Flags);
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// If we aren't ignoring missing entries, assert that something happened.
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if (V != 0)
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PN->setIncomingBlock(i, cast<BasicBlock>(V));
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else
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assert((Flags & RF_IgnoreMissingEntries) &&
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"Referenced block not in value map!");
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}
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}
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// Remap attached metadata.
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SmallVector<std::pair<unsigned, MDNode *>, 4> MDs;
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I->getAllMetadata(MDs);
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for (SmallVectorImpl<std::pair<unsigned, MDNode *> >::iterator
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MI = MDs.begin(), ME = MDs.end(); MI != ME; ++MI) {
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MDNode *Old = MI->second;
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MDNode *New = MapValue(Old, VMap, Flags, TypeMapper);
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if (New != Old)
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I->setMetadata(MI->first, New);
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}
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// If the instruction's type is being remapped, do so now.
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if (TypeMapper)
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I->mutateType(TypeMapper->remapType(I->getType()));
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}
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