#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Statistic.h"
+#include "llvm/ADT/Triple.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/DiagnosticInfo.h"
Elements[I] = get(SrcSTy->getElementType(I));
DstSTy->setBody(Elements, SrcSTy->isPacked());
+ DstStructTypesSet.switchToNonOpaque(DstSTy);
}
SrcDefinitionsToResolve.clear();
DstResolvedOpaqueTypes.clear();
DiagnosticHandlerFunction DiagnosticHandler;
+ /// For symbol clashes, prefer those from Src.
+ bool OverrideFromSrc;
+
public:
ModuleLinker(Module *dstM, Linker::IdentifiedStructTypeSet &Set, Module *srcM,
- DiagnosticHandlerFunction DiagnosticHandler)
+ DiagnosticHandlerFunction DiagnosticHandler,
+ bool OverrideFromSrc)
: DstM(dstM), SrcM(srcM), TypeMap(Set),
ValMaterializer(TypeMap, DstM, LazilyLinkGlobalValues),
- DiagnosticHandler(DiagnosticHandler) {}
+ DiagnosticHandler(DiagnosticHandler), OverrideFromSrc(OverrideFromSrc) {
+ }
bool run();
// If there is no linkage to be performed or we're linking from the source,
// bring over SGA.
auto *PTy = cast<PointerType>(TypeMap.get(SGA->getType()));
- return GlobalAlias::create(PTy->getElementType(), PTy->getAddressSpace(),
- SGA->getLinkage(), SGA->getName(), &DstM);
+ return GlobalAlias::create(PTy, SGA->getLinkage(), SGA->getName(), &DstM);
}
static GlobalValue *copyGlobalValueProto(TypeMapTy &TypeMap, Module &DstM,
getComdatLeader(SrcM, ComdatName, SrcGV))
return true;
- const DataLayout *DstDL = DstM->getDataLayout();
- const DataLayout *SrcDL = SrcM->getDataLayout();
- if (!DstDL || !SrcDL) {
- return emitError(
- "Linking COMDATs named '" + ComdatName +
- "': can't do size dependent selection without DataLayout!");
- }
+ const DataLayout &DstDL = DstM->getDataLayout();
+ const DataLayout &SrcDL = SrcM->getDataLayout();
uint64_t DstSize =
- DstDL->getTypeAllocSize(DstGV->getType()->getPointerElementType());
+ DstDL.getTypeAllocSize(DstGV->getType()->getPointerElementType());
uint64_t SrcSize =
- SrcDL->getTypeAllocSize(SrcGV->getType()->getPointerElementType());
+ SrcDL.getTypeAllocSize(SrcGV->getType()->getPointerElementType());
if (Result == Comdat::SelectionKind::ExactMatch) {
if (SrcGV->getInitializer() != DstGV->getInitializer())
return emitError("Linking COMDATs named '" + ComdatName +
bool ModuleLinker::shouldLinkFromSource(bool &LinkFromSrc,
const GlobalValue &Dest,
const GlobalValue &Src) {
+ // Should we unconditionally use the Src?
+ if (OverrideFromSrc) {
+ LinkFromSrc = true;
+ return false;
+ }
+
// We always have to add Src if it has appending linkage.
if (Src.hasAppendingLinkage()) {
LinkFromSrc = true;
return false;
}
- // FIXME: Make datalayout mandatory and just use getDataLayout().
- DataLayout DL(Dest.getParent());
-
+ const DataLayout &DL = Dest.getParent()->getDataLayout();
uint64_t DestSize = DL.getTypeAllocSize(Dest.getType()->getElementType());
uint64_t SrcSize = DL.getTypeAllocSize(Src.getType()->getElementType());
LinkFromSrc = SrcSize > DestSize;
} else {
// If the GV is to be lazily linked, don't create it just yet.
// The ValueMaterializerTy will deal with creating it if it's used.
- if (!DGV && (SGV->hasLocalLinkage() || SGV->hasLinkOnceLinkage() ||
- SGV->hasAvailableExternallyLinkage())) {
+ if (!DGV && !OverrideFromSrc &&
+ (SGV->hasLocalLinkage() || SGV->hasLinkOnceLinkage() ||
+ SGV->hasAvailableExternallyLinkage())) {
DoNotLinkFromSource.insert(SGV);
return false;
}
continue;
}
DstElements.push_back(
- MapValue(V, ValueMap, RF_None, &TypeMap, &ValMaterializer));
+ MapValue(V, ValueMap, RF_MoveDistinctMDs, &TypeMap, &ValMaterializer));
}
if (IsNewStructor) {
NewType = ArrayType::get(NewType->getElementType(), DstElements.size());
/// referenced are in Dest.
void ModuleLinker::linkGlobalInit(GlobalVariable &Dst, GlobalVariable &Src) {
// Figure out what the initializer looks like in the dest module.
- Dst.setInitializer(MapValue(Src.getInitializer(), ValueMap, RF_None, &TypeMap,
- &ValMaterializer));
+ Dst.setInitializer(MapValue(Src.getInitializer(), ValueMap,
+ RF_MoveDistinctMDs, &TypeMap, &ValMaterializer));
}
/// Copy the source function over into the dest function and fix up references
// Link in the prefix data.
if (Src.hasPrefixData())
- Dst.setPrefixData(MapValue(Src.getPrefixData(), ValueMap, RF_None, &TypeMap,
- &ValMaterializer));
+ Dst.setPrefixData(MapValue(Src.getPrefixData(), ValueMap,
+ RF_MoveDistinctMDs, &TypeMap, &ValMaterializer));
// Link in the prologue data.
if (Src.hasPrologueData())
- Dst.setPrologueData(MapValue(Src.getPrologueData(), ValueMap, RF_None,
- &TypeMap, &ValMaterializer));
+ Dst.setPrologueData(MapValue(Src.getPrologueData(), ValueMap,
+ RF_MoveDistinctMDs, &TypeMap,
+ &ValMaterializer));
+
+ // Link in the personality function.
+ if (Src.hasPersonalityFn())
+ Dst.setPersonalityFn(MapValue(Src.getPersonalityFn(), ValueMap,
+ RF_MoveDistinctMDs, &TypeMap,
+ &ValMaterializer));
// Go through and convert function arguments over, remembering the mapping.
Function::arg_iterator DI = Dst.arg_begin();
++DI;
}
+ // Copy over the metadata attachments.
+ SmallVector<std::pair<unsigned, MDNode *>, 8> MDs;
+ Src.getAllMetadata(MDs);
+ for (const auto &I : MDs)
+ Dst.setMetadata(I.first, MapMetadata(I.second, ValueMap, RF_MoveDistinctMDs,
+ &TypeMap, &ValMaterializer));
+
// Splice the body of the source function into the dest function.
Dst.getBasicBlockList().splice(Dst.end(), Src.getBasicBlockList());
// functions and patch them up to point to the local versions.
for (BasicBlock &BB : Dst)
for (Instruction &I : BB)
- RemapInstruction(&I, ValueMap, RF_IgnoreMissingEntries, &TypeMap,
+ RemapInstruction(&I, ValueMap,
+ RF_IgnoreMissingEntries | RF_MoveDistinctMDs, &TypeMap,
&ValMaterializer);
// There is no need to map the arguments anymore.
for (Argument &Arg : Src.args())
ValueMap.erase(&Arg);
- Src.Dematerialize();
+ Src.dematerialize();
return false;
}
void ModuleLinker::linkAliasBody(GlobalAlias &Dst, GlobalAlias &Src) {
Constant *Aliasee = Src.getAliasee();
- Constant *Val =
- MapValue(Aliasee, ValueMap, RF_None, &TypeMap, &ValMaterializer);
+ Constant *Val = MapValue(Aliasee, ValueMap, RF_MoveDistinctMDs, &TypeMap,
+ &ValMaterializer);
Dst.setAliasee(Val);
}
/// Insert all of the named MDNodes in Src into the Dest module.
void ModuleLinker::linkNamedMDNodes() {
const NamedMDNode *SrcModFlags = SrcM->getModuleFlagsMetadata();
- for (Module::const_named_metadata_iterator I = SrcM->named_metadata_begin(),
- E = SrcM->named_metadata_end(); I != E; ++I) {
+ for (const NamedMDNode &NMD : SrcM->named_metadata()) {
// Don't link module flags here. Do them separately.
- if (&*I == SrcModFlags) continue;
- NamedMDNode *DestNMD = DstM->getOrInsertNamedMetadata(I->getName());
+ if (&NMD == SrcModFlags)
+ continue;
+ NamedMDNode *DestNMD = DstM->getOrInsertNamedMetadata(NMD.getName());
// Add Src elements into Dest node.
- for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i)
- DestNMD->addOperand(MapMetadata(I->getOperand(i), ValueMap, RF_None,
+ for (const MDNode *op : NMD.operands())
+ DestNMD->addOperand(MapMetadata(op, ValueMap, RF_MoveDistinctMDs,
&TypeMap, &ValMaterializer));
}
}
/// Drop DISubprograms that have been superseded.
///
-/// FIXME: this creates an asymmetric result: we strip losing subprograms from
-/// DstM, but leave losing subprograms in SrcM. Instead we should also strip
-/// losers from SrcM, but this requires extra plumbing in MapMetadata.
+/// FIXME: this creates an asymmetric result: we strip functions from losing
+/// subprograms in DstM, but leave losing subprograms in SrcM.
+/// TODO: Remove this logic once the backend can correctly determine canonical
+/// subprograms.
void ModuleLinker::stripReplacedSubprograms() {
// Avoid quadratic runtime by returning early when there's nothing to do.
if (OverridingFunctions.empty())
auto Functions = std::move(OverridingFunctions);
OverridingFunctions.clear();
- // Drop subprograms whose functions have been overridden by the new compile
- // unit.
+ // Drop functions from subprograms if they've been overridden by the new
+ // compile unit.
NamedMDNode *CompileUnits = DstM->getNamedMetadata("llvm.dbg.cu");
if (!CompileUnits)
return;
for (unsigned I = 0, E = CompileUnits->getNumOperands(); I != E; ++I) {
- DICompileUnit CU(CompileUnits->getOperand(I));
+ auto *CU = cast<DICompileUnit>(CompileUnits->getOperand(I));
assert(CU && "Expected valid compile unit");
- DITypedArray<DISubprogram> SPs(CU.getSubprograms());
- assert(SPs && "Expected valid subprogram array");
-
- SmallVector<Metadata *, 16> NewSPs;
- NewSPs.reserve(SPs.getNumElements());
- for (unsigned S = 0, SE = SPs.getNumElements(); S != SE; ++S) {
- DISubprogram SP = SPs.getElement(S);
- if (SP && SP.getFunction() && Functions.count(SP.getFunction()))
+ for (DISubprogram *SP : CU->getSubprograms()) {
+ if (!SP || !SP->getFunction() || !Functions.count(SP->getFunction()))
continue;
- NewSPs.push_back(SP);
+ // Prevent DebugInfoFinder from tagging this as the canonical subprogram,
+ // since the canonical one is in the incoming module.
+ SP->replaceFunction(nullptr);
}
-
- // Redirect operand to the overriding subprogram.
- if (NewSPs.size() != SPs.getNumElements())
- CU.replaceSubprograms(DIArray(MDNode::get(DstM->getContext(), NewSPs)));
}
}
MDNode *SrcValue = cast<MDNode>(SrcOp->getOperand(2));
SmallVector<Metadata *, 8> MDs;
MDs.reserve(DstValue->getNumOperands() + SrcValue->getNumOperands());
- for (unsigned i = 0, e = DstValue->getNumOperands(); i != e; ++i)
- MDs.push_back(DstValue->getOperand(i));
- for (unsigned i = 0, e = SrcValue->getNumOperands(); i != e; ++i)
- MDs.push_back(SrcValue->getOperand(i));
+ MDs.append(DstValue->op_begin(), DstValue->op_end());
+ MDs.append(SrcValue->op_begin(), SrcValue->op_end());
replaceDstValue(MDNode::get(DstM->getContext(), MDs));
break;
SmallSetVector<Metadata *, 16> Elts;
MDNode *DstValue = cast<MDNode>(DstOp->getOperand(2));
MDNode *SrcValue = cast<MDNode>(SrcOp->getOperand(2));
- for (unsigned i = 0, e = DstValue->getNumOperands(); i != e; ++i)
- Elts.insert(DstValue->getOperand(i));
- for (unsigned i = 0, e = SrcValue->getNumOperands(); i != e; ++i)
- Elts.insert(SrcValue->getOperand(i));
+ Elts.insert(DstValue->op_begin(), DstValue->op_end());
+ Elts.insert(SrcValue->op_begin(), SrcValue->op_end());
replaceDstValue(MDNode::get(DstM->getContext(),
makeArrayRef(Elts.begin(), Elts.end())));
return HasErr;
}
+// This function returns true if the triples match.
+static bool triplesMatch(const Triple &T0, const Triple &T1) {
+ // If vendor is apple, ignore the version number.
+ if (T0.getVendor() == Triple::Apple)
+ return T0.getArch() == T1.getArch() &&
+ T0.getSubArch() == T1.getSubArch() &&
+ T0.getVendor() == T1.getVendor() &&
+ T0.getOS() == T1.getOS();
+
+ return T0 == T1;
+}
+
+// This function returns the merged triple.
+static std::string mergeTriples(const Triple &SrcTriple, const Triple &DstTriple) {
+ // If vendor is apple, pick the triple with the larger version number.
+ if (SrcTriple.getVendor() == Triple::Apple)
+ if (DstTriple.isOSVersionLT(SrcTriple))
+ return SrcTriple.str();
+
+ return DstTriple.str();
+}
+
bool ModuleLinker::run() {
assert(DstM && "Null destination module");
assert(SrcM && "Null source module");
// Inherit the target data from the source module if the destination module
// doesn't have one already.
- if (!DstM->getDataLayout() && SrcM->getDataLayout())
+ if (DstM->getDataLayout().isDefault())
DstM->setDataLayout(SrcM->getDataLayout());
- // Copy the target triple from the source to dest if the dest's is empty.
- if (DstM->getTargetTriple().empty() && !SrcM->getTargetTriple().empty())
- DstM->setTargetTriple(SrcM->getTargetTriple());
-
- if (SrcM->getDataLayout() && DstM->getDataLayout() &&
- *SrcM->getDataLayout() != *DstM->getDataLayout()) {
+ if (SrcM->getDataLayout() != DstM->getDataLayout()) {
emitWarning("Linking two modules of different data layouts: '" +
SrcM->getModuleIdentifier() + "' is '" +
SrcM->getDataLayoutStr() + "' whereas '" +
DstM->getModuleIdentifier() + "' is '" +
DstM->getDataLayoutStr() + "'\n");
}
- if (!SrcM->getTargetTriple().empty() &&
- DstM->getTargetTriple() != SrcM->getTargetTriple()) {
+
+ // Copy the target triple from the source to dest if the dest's is empty.
+ if (DstM->getTargetTriple().empty() && !SrcM->getTargetTriple().empty())
+ DstM->setTargetTriple(SrcM->getTargetTriple());
+
+ Triple SrcTriple(SrcM->getTargetTriple()), DstTriple(DstM->getTargetTriple());
+
+ if (!SrcM->getTargetTriple().empty() && !triplesMatch(SrcTriple, DstTriple))
emitWarning("Linking two modules of different target triples: " +
SrcM->getModuleIdentifier() + "' is '" +
SrcM->getTargetTriple() + "' whereas '" +
DstM->getModuleIdentifier() + "' is '" +
DstM->getTargetTriple() + "'\n");
- }
+
+ DstM->setTargetTriple(mergeTriples(SrcTriple, DstTriple));
// Append the module inline asm string.
if (!SrcM->getModuleInlineAsm().empty()) {
// Insert all of the globals in src into the DstM module... without linking
// initializers (which could refer to functions not yet mapped over).
- for (Module::global_iterator I = SrcM->global_begin(),
- E = SrcM->global_end(); I != E; ++I)
- if (linkGlobalValueProto(I))
+ for (GlobalVariable &GV : SrcM->globals())
+ if (linkGlobalValueProto(&GV))
return true;
// Link the functions together between the two modules, without doing function
// function... We do this so that when we begin processing function bodies,
// all of the global values that may be referenced are available in our
// ValueMap.
- for (Module::iterator I = SrcM->begin(), E = SrcM->end(); I != E; ++I)
- if (linkGlobalValueProto(I))
+ for (Function &F :*SrcM)
+ if (linkGlobalValueProto(&F))
return true;
// If there were any aliases, link them now.
- for (Module::alias_iterator I = SrcM->alias_begin(),
- E = SrcM->alias_end(); I != E; ++I)
- if (linkGlobalValueProto(I))
+ for (GlobalAlias &GA : SrcM->aliases())
+ if (linkGlobalValueProto(&GA))
return true;
- for (unsigned i = 0, e = AppendingVars.size(); i != e; ++i)
- linkAppendingVarInit(AppendingVars[i]);
+ for (const AppendingVarInfo &AppendingVar : AppendingVars)
+ linkAppendingVarInit(AppendingVar);
for (const auto &Entry : DstM->getComdatSymbolTable()) {
const Comdat &C = Entry.getValue();
if (C.getSelectionKind() == Comdat::Any)
continue;
const GlobalValue *GV = SrcM->getNamedValue(C.getName());
- assert(GV);
- MapValue(GV, ValueMap, RF_None, &TypeMap, &ValMaterializer);
+ if (GV)
+ MapValue(GV, ValueMap, RF_MoveDistinctMDs, &TypeMap, &ValMaterializer);
}
+ // Strip replaced subprograms before mapping any metadata -- so that we're
+ // not changing metadata from the source module (note that
+ // linkGlobalValueBody() eventually calls RemapInstruction() and therefore
+ // MapMetadata()) -- but after linking global value protocols -- so that
+ // OverridingFunctions has been built.
+ stripReplacedSubprograms();
+
// Link in the function bodies that are defined in the source module into
// DstM.
for (Function &SF : *SrcM) {
linkGlobalValueBody(Src);
}
- // Strip replaced subprograms before linking together compile units.
- stripReplacedSubprograms();
-
// Remap all of the named MDNodes in Src into the DstM module. We do this
// after linking GlobalValues so that MDNodes that reference GlobalValues
// are properly remapped.
NonOpaqueStructTypes.insert(Ty);
}
+void Linker::IdentifiedStructTypeSet::switchToNonOpaque(StructType *Ty) {
+ assert(!Ty->isOpaque());
+ NonOpaqueStructTypes.insert(Ty);
+ bool Removed = OpaqueStructTypes.erase(Ty);
+ (void)Removed;
+ assert(Removed);
+}
+
void Linker::IdentifiedStructTypeSet::addOpaque(StructType *Ty) {
assert(Ty->isOpaque());
OpaqueStructTypes.insert(Ty);
Composite = nullptr;
}
-bool Linker::linkInModule(Module *Src) {
+bool Linker::linkInModule(Module *Src, bool OverrideSymbols) {
ModuleLinker TheLinker(Composite, IdentifiedStructTypes, Src,
- DiagnosticHandler);
+ DiagnosticHandler, OverrideSymbols);
bool RetCode = TheLinker.run();
Composite->dropTriviallyDeadConstantArrays();
return RetCode;
}
+void Linker::setModule(Module *Dst) {
+ init(Dst, DiagnosticHandler);
+}
+
//===----------------------------------------------------------------------===//
// LinkModules entrypoint.
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
LLVMBool LLVMLinkModules(LLVMModuleRef Dest, LLVMModuleRef Src,
- unsigned Unused, char **OutMessages) {
+ LLVMLinkerMode Unused, char **OutMessages) {
Module *D = unwrap(Dest);
std::string Message;
raw_string_ostream Stream(Message);
LLVMBool Result = Linker::LinkModules(
D, unwrap(Src), [&](const DiagnosticInfo &DI) { DI.print(DP); });
- if (OutMessages && Result)
+ if (OutMessages && Result) {
+ Stream.flush();
*OutMessages = strdup(Message.c_str());
+ }
return Result;
}
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