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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124099 91177308-0d34-0410-b5e6-96231b3b80d8
142 lines
5.2 KiB
C++
142 lines
5.2 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/Type.h"
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#include "llvm/Constants.h"
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#include "llvm/Function.h"
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#include "llvm/Metadata.h"
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#include "llvm/ADT/SmallVector.h"
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using namespace llvm;
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Value *llvm::MapValue(const Value *V, ValueToValueMapTy &VM,
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RemapFlags Flags) {
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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<InlineAsm>(V) || isa<MDString>(V))
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return VM[V] = const_cast<Value*>(V);
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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(), 0, 0);
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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) == 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) : 0);
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}
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MDNode *NewMD = MDNode::get(V->getContext(), Elts.data(), Elts.size());
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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 = cast<Function>(MapValue(BA->getFunction(), VM, Flags));
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BasicBlock *BB = cast_or_null<BasicBlock>(MapValue(BA->getBasicBlock(), VM,
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Flags));
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return VM[V] = BlockAddress::get(F, BB ? BB : BA->getBasicBlock());
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}
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for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i) {
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Value *Op = C->getOperand(i);
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Value *Mapped = MapValue(Op, VM, Flags);
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if (Mapped == C) continue;
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// Okay, the operands don't all match. We've already processed some or all
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// of the operands, set them up now.
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std::vector<Constant*> Ops;
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Ops.reserve(C->getNumOperands());
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for (unsigned j = 0; j != i; ++j)
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Ops.push_back(cast<Constant>(C->getOperand(i)));
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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 (++i; i != e; ++i)
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Ops.push_back(cast<Constant>(MapValue(C->getOperand(i), VM, Flags)));
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if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C))
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return VM[V] = CE->getWithOperands(Ops);
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if (ConstantArray *CA = dyn_cast<ConstantArray>(C))
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return VM[V] = ConstantArray::get(CA->getType(), Ops);
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if (ConstantStruct *CS = dyn_cast<ConstantStruct>(C))
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return VM[V] = ConstantStruct::get(CS->getType(), Ops);
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assert(isa<ConstantVector>(C) && "Unknown mapped constant type");
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return VM[V] = ConstantVector::get(Ops);
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}
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// If we reach here, all of the operands of the constant match.
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return VM[V] = C;
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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) {
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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);
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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 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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Value *Old = MI->second;
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Value *New = MapValue(Old, VMap, Flags);
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if (New != Old)
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I->setMetadata(MI->first, cast<MDNode>(New));
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}
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}
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