}
}
-void BitcodeReaderMDValueList::AssignValue(Value *V, unsigned Idx) {
+void BitcodeReaderMDValueList::AssignValue(Metadata *MD, unsigned Idx) {
if (Idx == size()) {
- push_back(V);
+ push_back(MD);
return;
}
if (Idx >= size())
resize(Idx+1);
- WeakVH &OldV = MDValuePtrs[Idx];
- if (!OldV) {
- OldV = V;
+ TrackingMDRef &OldMD = MDValuePtrs[Idx];
+ if (!OldMD) {
+ OldMD.reset(MD);
return;
}
// If there was a forward reference to this value, replace it.
- MDNode *PrevVal = cast<MDNode>(OldV);
- OldV->replaceAllUsesWith(V);
- MDNode::deleteTemporary(PrevVal);
- // Deleting PrevVal sets Idx value in MDValuePtrs to null. Set new
- // value for Idx.
- MDValuePtrs[Idx] = V;
+ MDNodeFwdDecl *PrevMD = cast<MDNodeFwdDecl>(OldMD.get());
+ PrevMD->replaceAllUsesWith(MD);
+ MDNode::deleteTemporary(PrevMD);
+ --NumFwdRefs;
}
-Value *BitcodeReaderMDValueList::getValueFwdRef(unsigned Idx) {
+Metadata *BitcodeReaderMDValueList::getValueFwdRef(unsigned Idx) {
if (Idx >= size())
resize(Idx + 1);
- if (Value *V = MDValuePtrs[Idx]) {
- assert(V->getType()->isMetadataTy() && "Type mismatch in value table!");
- return V;
- }
+ if (Metadata *MD = MDValuePtrs[Idx])
+ return MD;
// Create and return a placeholder, which will later be RAUW'd.
- Value *V = MDNode::getTemporary(Context, None);
- MDValuePtrs[Idx] = V;
- return V;
+ AnyFwdRefs = true;
+ ++NumFwdRefs;
+ Metadata *MD = MDNode::getTemporary(Context, None);
+ MDValuePtrs[Idx].reset(MD);
+ return MD;
+}
+
+void BitcodeReaderMDValueList::tryToResolveCycles() {
+ if (!AnyFwdRefs)
+ // Nothing to do.
+ return;
+
+ if (NumFwdRefs)
+ // Still forward references... can't resolve cycles.
+ return;
+
+ // Resolve any cycles.
+ for (auto &MD : MDValuePtrs) {
+ assert(!(MD && isa<MDNodeFwdDecl>(MD)) && "Unexpected forward reference");
+ if (auto *G = dyn_cast_or_null<GenericMDNode>(MD))
+ G->resolveCycles();
+ }
}
Type *BitcodeReader::getTypeByID(unsigned ID) {
case BitstreamEntry::Error:
return Error(BitcodeError::MalformedBlock);
case BitstreamEntry::EndBlock:
+ MDValueList.tryToResolveCycles();
return std::error_code();
case BitstreamEntry::Record:
// The interesting case.
}
break;
}
- case bitc::METADATA_FN_NODE: {
- // This is a function-local node.
+ case bitc::METADATA_OLD_FN_NODE: {
+ // FIXME: Remove in 4.0.
+ // This is a LocalAsMetadata record, the only type of function-local
+ // metadata.
if (Record.size() % 2 == 1)
return Error(BitcodeError::InvalidRecord);
- // If this isn't a single-operand node that directly references
- // non-metadata, we're dropping it. This used to be legal, but there's
- // no upgrade path.
+ // If this isn't a LocalAsMetadata record, we're dropping it. This used
+ // to be legal, but there's no upgrade path.
auto dropRecord = [&] {
MDValueList.AssignValue(MDNode::get(Context, None), NextMDValueNo++);
};
break;
}
- Value *Elts[] = {ValueList.getValueFwdRef(Record[1], Ty)};
- Value *V = MDNode::getWhenValsUnresolved(Context, Elts,
- /*IsFunctionLocal*/ true);
- MDValueList.AssignValue(V, NextMDValueNo++);
+ MDValueList.AssignValue(
+ LocalAsMetadata::get(ValueList.getValueFwdRef(Record[1], Ty)),
+ NextMDValueNo++);
break;
}
- case bitc::METADATA_NODE: {
+ case bitc::METADATA_OLD_NODE: {
+ // FIXME: Remove in 4.0.
if (Record.size() % 2 == 1)
return Error(BitcodeError::InvalidRecord);
unsigned Size = Record.size();
- SmallVector<Value*, 8> Elts;
+ SmallVector<Metadata *, 8> Elts;
for (unsigned i = 0; i != Size; i += 2) {
Type *Ty = getTypeByID(Record[i]);
if (!Ty)
return Error(BitcodeError::InvalidRecord);
if (Ty->isMetadataTy())
Elts.push_back(MDValueList.getValueFwdRef(Record[i+1]));
- else if (!Ty->isVoidTy())
- Elts.push_back(ValueList.getValueFwdRef(Record[i+1], Ty));
- else
+ else if (!Ty->isVoidTy()) {
+ auto *MD =
+ ValueAsMetadata::get(ValueList.getValueFwdRef(Record[i + 1], Ty));
+ assert(isa<ConstantAsMetadata>(MD) &&
+ "Expected non-function-local metadata");
+ Elts.push_back(MD);
+ } else
Elts.push_back(nullptr);
}
- Value *V = MDNode::getWhenValsUnresolved(Context, Elts,
- /*IsFunctionLocal*/ false);
- MDValueList.AssignValue(V, NextMDValueNo++);
+ MDValueList.AssignValue(MDNode::get(Context, Elts), NextMDValueNo++);
+ break;
+ }
+ case bitc::METADATA_VALUE: {
+ if (Record.size() != 2)
+ return Error(BitcodeError::InvalidRecord);
+
+ Type *Ty = getTypeByID(Record[0]);
+ if (Ty->isMetadataTy() || Ty->isVoidTy())
+ return Error(BitcodeError::InvalidRecord);
+
+ MDValueList.AssignValue(
+ ValueAsMetadata::get(ValueList.getValueFwdRef(Record[1], Ty)),
+ NextMDValueNo++);
+ break;
+ }
+ case bitc::METADATA_NODE: {
+ SmallVector<Metadata *, 8> Elts;
+ Elts.reserve(Record.size());
+ for (unsigned ID : Record)
+ Elts.push_back(ID ? MDValueList.getValueFwdRef(ID - 1) : nullptr);
+ MDValueList.AssignValue(MDNode::get(Context, Elts), NextMDValueNo++);
break;
}
case bitc::METADATA_STRING: {
std::string String(Record.begin(), Record.end());
llvm::UpgradeMDStringConstant(String);
- Value *V = MDString::get(Context, String);
- MDValueList.AssignValue(V, NextMDValueNo++);
+ Metadata *MD = MDString::get(Context, String);
+ MDValueList.AssignValue(MD, NextMDValueNo++);
break;
}
case bitc::METADATA_KIND: {
MDKindMap.find(Kind);
if (I == MDKindMap.end())
return Error(BitcodeError::InvalidID);
- MDNode *Node = cast<MDNode>(MDValueList.getValueFwdRef(Record[i+1]));
- if (Node->isFunctionLocal())
+ Metadata *Node = MDValueList.getValueFwdRef(Record[i + 1]);
+ if (isa<LocalAsMetadata>(Node))
// Drop the attachment. This used to be legal, but there's no
// upgrade path.
break;
- Inst->setMetadata(I->second, Node);
+ Inst->setMetadata(I->second, cast<MDNode>(Node));
if (I->second == LLVMContext::MD_tbaa)
InstsWithTBAATag.push_back(Inst);
}
std::error_code BitcodeReader::InitLazyStream() {
// Check and strip off the bitcode wrapper; BitstreamReader expects never to
// see it.
- StreamingMemoryObject *Bytes = new StreamingMemoryObject(LazyStreamer);
- StreamFile.reset(new BitstreamReader(Bytes));
+ auto OwnedBytes = make_unique<StreamingMemoryObject>(LazyStreamer);
+ StreamingMemoryObject &Bytes = *OwnedBytes;
+ StreamFile = make_unique<BitstreamReader>(std::move(OwnedBytes));
Stream.init(&*StreamFile);
unsigned char buf[16];
- if (Bytes->readBytes(buf, 16, 0) != 16)
+ if (Bytes.readBytes(buf, 16, 0) != 16)
return Error(BitcodeError::InvalidBitcodeSignature);
if (!isBitcode(buf, buf + 16))
const unsigned char *bitcodeStart = buf;
const unsigned char *bitcodeEnd = buf + 16;
SkipBitcodeWrapperHeader(bitcodeStart, bitcodeEnd, false);
- Bytes->dropLeadingBytes(bitcodeStart - buf);
- Bytes->setKnownObjectSize(bitcodeEnd - bitcodeStart);
+ Bytes.dropLeadingBytes(bitcodeStart - buf);
+ Bytes.setKnownObjectSize(bitcodeEnd - bitcodeStart);
}
return std::error_code();
}
return getLazyBitcodeModuleImpl(std::move(Buffer), Context, false);
}
-Module *llvm::getStreamedBitcodeModule(const std::string &name,
- DataStreamer *streamer,
- LLVMContext &Context,
- std::string *ErrMsg) {
- Module *M = new Module(name, Context);
- BitcodeReader *R = new BitcodeReader(streamer, Context);
+ErrorOr<std::unique_ptr<Module>>
+llvm::getStreamedBitcodeModule(StringRef Name, DataStreamer *Streamer,
+ LLVMContext &Context) {
+ std::unique_ptr<Module> M = make_unique<Module>(Name, Context);
+ BitcodeReader *R = new BitcodeReader(Streamer, Context);
M->setMaterializer(R);
- if (std::error_code EC = R->ParseBitcodeInto(M)) {
- if (ErrMsg)
- *ErrMsg = EC.message();
- delete M; // Also deletes R.
- return nullptr;
- }
- return M;
+ if (std::error_code EC = R->ParseBitcodeInto(M.get()))
+ return EC;
+ return std::move(M);
}
ErrorOr<Module *> llvm::parseBitcodeFile(MemoryBufferRef Buffer,
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