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Allow unresolved nodes through the `MapMetadata()` if `RF_NoModuleLevelChanges`, since there's no remapping to do anyway. This fixes PR22929. I'll add a clang test as a follow-up. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232449 91177308-0d34-0410-b5e6-96231b3b80d8
390 lines
15 KiB
C++
390 lines
15 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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void ValueMaterializer::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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ValueMaterializer *Materializer) {
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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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// If we have a materializer and it can materialize a value, use that.
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if (Materializer) {
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if (Value *NewV = Materializer->materializeValueFor(const_cast<Value*>(V)))
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return VM[V] = NewV;
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}
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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))
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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 auto *MDV = dyn_cast<MetadataAsValue>(V)) {
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const Metadata *MD = MDV->getMetadata();
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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 (!isa<LocalAsMetadata>(MD) && (Flags & RF_NoModuleLevelChanges))
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return VM[V] = const_cast<Value *>(V);
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auto *MappedMD = MapMetadata(MD, VM, Flags, TypeMapper, Materializer);
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if (MD == MappedMD || (!MappedMD && (Flags & RF_IgnoreMissingEntries)))
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return VM[V] = const_cast<Value *>(V);
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// FIXME: This assert crashes during bootstrap, but I think it should be
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// correct. For now, just match behaviour from before the metadata/value
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// split.
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//
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// assert(MappedMD && "Referenced metadata value not in value map");
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return VM[V] = MetadataAsValue::get(V->getContext(), MappedMD);
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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)
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return nullptr;
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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, Materializer));
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BasicBlock *BB = cast_or_null<BasicBlock>(MapValue(BA->getBasicBlock(), VM,
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Flags, TypeMapper, Materializer));
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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 = nullptr;
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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, Materializer);
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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, Materializer));
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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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static Metadata *mapToMetadata(ValueToValueMapTy &VM, const Metadata *Key,
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Metadata *Val) {
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VM.MD()[Key].reset(Val);
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return Val;
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}
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static Metadata *mapToSelf(ValueToValueMapTy &VM, const Metadata *MD) {
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return mapToMetadata(VM, MD, const_cast<Metadata *>(MD));
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}
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static Metadata *MapMetadataImpl(const Metadata *MD,
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SmallVectorImpl<MDNode *> &Cycles,
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ValueToValueMapTy &VM, RemapFlags Flags,
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ValueMapTypeRemapper *TypeMapper,
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ValueMaterializer *Materializer);
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static Metadata *mapMetadataOp(Metadata *Op, SmallVectorImpl<MDNode *> &Cycles,
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ValueToValueMapTy &VM, RemapFlags Flags,
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ValueMapTypeRemapper *TypeMapper,
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ValueMaterializer *Materializer) {
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if (!Op)
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return nullptr;
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if (Metadata *MappedOp =
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MapMetadataImpl(Op, Cycles, VM, Flags, TypeMapper, Materializer))
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return MappedOp;
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// Use identity map if MappedOp is null and we can ignore missing entries.
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if (Flags & RF_IgnoreMissingEntries)
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return Op;
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// FIXME: This assert crashes during bootstrap, but I think it should be
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// correct. For now, just match behaviour from before the metadata/value
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// split.
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//
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// llvm_unreachable("Referenced metadata not in value map!");
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return nullptr;
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}
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/// \brief Remap nodes.
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///
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/// Insert \c NewNode in the value map, and then remap \c OldNode's operands.
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/// Assumes that \c NewNode is already a clone of \c OldNode.
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///
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/// \pre \c NewNode is a clone of \c OldNode.
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static bool remap(const MDNode *OldNode, MDNode *NewNode,
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SmallVectorImpl<MDNode *> &Cycles, ValueToValueMapTy &VM,
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RemapFlags Flags, ValueMapTypeRemapper *TypeMapper,
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ValueMaterializer *Materializer) {
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assert(OldNode->getNumOperands() == NewNode->getNumOperands() &&
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"Expected nodes to match");
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assert(OldNode->isResolved() && "Expected resolved node");
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assert(!NewNode->isUniqued() && "Expected non-uniqued node");
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// Map the node upfront so it's available for cyclic references.
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mapToMetadata(VM, OldNode, NewNode);
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bool AnyChanged = false;
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for (unsigned I = 0, E = OldNode->getNumOperands(); I != E; ++I) {
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Metadata *Old = OldNode->getOperand(I);
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assert(NewNode->getOperand(I) == Old &&
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"Expected old operands to already be in place");
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Metadata *New = mapMetadataOp(OldNode->getOperand(I), Cycles, VM, Flags,
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TypeMapper, Materializer);
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if (Old != New) {
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AnyChanged = true;
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NewNode->replaceOperandWith(I, New);
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}
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}
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return AnyChanged;
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}
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/// \brief Map a distinct MDNode.
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///
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/// Distinct nodes are not uniqued, so they must always recreated.
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static Metadata *mapDistinctNode(const MDNode *Node,
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SmallVectorImpl<MDNode *> &Cycles,
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ValueToValueMapTy &VM, RemapFlags Flags,
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ValueMapTypeRemapper *TypeMapper,
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ValueMaterializer *Materializer) {
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assert(Node->isDistinct() && "Expected distinct node");
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MDNode *NewMD = MDNode::replaceWithDistinct(Node->clone());
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remap(Node, NewMD, Cycles, VM, Flags, TypeMapper, Materializer);
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// Track any cycles beneath this node.
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for (Metadata *Op : NewMD->operands())
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if (auto *Node = dyn_cast_or_null<MDNode>(Op))
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if (!Node->isResolved())
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Cycles.push_back(Node);
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return NewMD;
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}
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/// \brief Map a uniqued MDNode.
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///
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/// Uniqued nodes may not need to be recreated (they may map to themselves).
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static Metadata *mapUniquedNode(const MDNode *Node,
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SmallVectorImpl<MDNode *> &Cycles,
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ValueToValueMapTy &VM, RemapFlags Flags,
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ValueMapTypeRemapper *TypeMapper,
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ValueMaterializer *Materializer) {
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assert(Node->isUniqued() && "Expected uniqued node");
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// Create a temporary node upfront in case we have a metadata cycle.
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auto ClonedMD = Node->clone();
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if (!remap(Node, ClonedMD.get(), Cycles, VM, Flags, TypeMapper, Materializer))
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// No operands changed, so use the identity mapping.
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return mapToSelf(VM, Node);
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// At least one operand has changed, so uniquify the cloned node.
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return mapToMetadata(VM, Node,
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MDNode::replaceWithUniqued(std::move(ClonedMD)));
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}
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static Metadata *MapMetadataImpl(const Metadata *MD,
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SmallVectorImpl<MDNode *> &Cycles,
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ValueToValueMapTy &VM, RemapFlags Flags,
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ValueMapTypeRemapper *TypeMapper,
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ValueMaterializer *Materializer) {
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// If the value already exists in the map, use it.
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if (Metadata *NewMD = VM.MD().lookup(MD).get())
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return NewMD;
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if (isa<MDString>(MD))
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return mapToSelf(VM, MD);
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if (isa<ConstantAsMetadata>(MD))
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if ((Flags & RF_NoModuleLevelChanges))
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return mapToSelf(VM, MD);
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if (const auto *VMD = dyn_cast<ValueAsMetadata>(MD)) {
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Value *MappedV =
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MapValue(VMD->getValue(), VM, Flags, TypeMapper, Materializer);
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if (VMD->getValue() == MappedV ||
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(!MappedV && (Flags & RF_IgnoreMissingEntries)))
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return mapToSelf(VM, MD);
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// FIXME: This assert crashes during bootstrap, but I think it should be
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// correct. For now, just match behaviour from before the metadata/value
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// split.
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//
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// assert(MappedV && "Referenced metadata not in value map!");
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if (MappedV)
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return mapToMetadata(VM, MD, ValueAsMetadata::get(MappedV));
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return nullptr;
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}
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// Note: this cast precedes the Flags check so we always get its associated
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// assertion.
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const MDNode *Node = cast<MDNode>(MD);
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// If this is a module-level metadata and we know that nothing at the
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// module level is changing, then use an identity mapping.
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if (Flags & RF_NoModuleLevelChanges)
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return mapToSelf(VM, MD);
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// Require resolved nodes whenever metadata might be remapped.
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assert(Node->isResolved() && "Unexpected unresolved node");
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if (Node->isDistinct())
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return mapDistinctNode(Node, Cycles, VM, Flags, TypeMapper, Materializer);
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return mapUniquedNode(Node, Cycles, VM, Flags, TypeMapper, Materializer);
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}
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Metadata *llvm::MapMetadata(const Metadata *MD, ValueToValueMapTy &VM,
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RemapFlags Flags, ValueMapTypeRemapper *TypeMapper,
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ValueMaterializer *Materializer) {
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SmallVector<MDNode *, 8> Cycles;
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Metadata *NewMD =
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MapMetadataImpl(MD, Cycles, VM, Flags, TypeMapper, Materializer);
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// Resolve cycles underneath MD.
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if (NewMD && NewMD != MD) {
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if (auto *N = dyn_cast<MDNode>(NewMD))
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if (!N->isResolved())
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N->resolveCycles();
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for (MDNode *N : Cycles)
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if (!N->isResolved())
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N->resolveCycles();
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} else {
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// Shouldn't get unresolved cycles if nothing was remapped.
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assert(Cycles.empty() && "Expected no unresolved cycles");
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}
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return NewMD;
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}
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MDNode *llvm::MapMetadata(const MDNode *MD, ValueToValueMapTy &VM,
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RemapFlags Flags, ValueMapTypeRemapper *TypeMapper,
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ValueMaterializer *Materializer) {
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return cast<MDNode>(MapMetadata(static_cast<const Metadata *>(MD), VM, Flags,
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TypeMapper, Materializer));
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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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ValueMaterializer *Materializer){
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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, Materializer);
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// If we aren't ignoring missing entries, assert that something happened.
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if (V)
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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)
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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(),
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ME = MDs.end();
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MI != ME; ++MI) {
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MDNode *Old = MI->second;
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MDNode *New = MapMetadata(Old, VMap, Flags, TypeMapper, Materializer);
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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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