#include "llvm/Linker/Linker.h"
#include "llvm-c/Linker.h"
+#include "llvm/ADT/Hashing.h"
#include "llvm/ADT/Optional.h"
#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"
#include "llvm/IR/DiagnosticPrinter.h"
#include "llvm/IR/LLVMContext.h"
//===----------------------------------------------------------------------===//
namespace {
-typedef SmallPtrSet<StructType *, 32> TypeSet;
-
class TypeMapTy : public ValueMapTypeRemapper {
/// This is a mapping from a source type to a destination type to use.
DenseMap<Type*, Type*> MappedTypes;
SmallPtrSet<StructType*, 16> DstResolvedOpaqueTypes;
public:
- TypeMapTy(TypeSet &Set) : DstStructTypesSet(Set) {}
+ TypeMapTy(Linker::IdentifiedStructTypeSet &DstStructTypesSet)
+ : DstStructTypesSet(DstStructTypesSet) {}
- TypeSet &DstStructTypesSet;
+ Linker::IdentifiedStructTypeSet &DstStructTypesSet;
/// Indicate that the specified type in the destination module is conceptually
/// equivalent to the specified type in the source module.
void addTypeMapping(Type *DstTy, Type *SrcTy);
/// Return the mapped type to use for the specified input type from the
/// source module.
Type *get(Type *SrcTy);
+ Type *get(Type *SrcTy, SmallPtrSet<StructType *, 8> &Visited);
+
+ void finishType(StructType *DTy, StructType *STy, ArrayRef<Type *> ETypes);
FunctionType *get(FunctionType *T) {
return cast<FunctionType>(get((Type *)T));
Elements[I] = get(SrcSTy->getElementType(I));
DstSTy->setBody(Elements, SrcSTy->isPacked());
+ DstStructTypesSet.switchToNonOpaque(DstSTy);
}
SrcDefinitionsToResolve.clear();
DstResolvedOpaqueTypes.clear();
}
-Type *TypeMapTy::get(Type *Ty) {
-#ifndef NDEBUG
- for (auto &Pair : MappedTypes) {
- assert(!(Pair.first != Ty && Pair.second == Ty) &&
- "mapping to a source type");
+void TypeMapTy::finishType(StructType *DTy, StructType *STy,
+ ArrayRef<Type *> ETypes) {
+ DTy->setBody(ETypes, STy->isPacked());
+
+ // Steal STy's name.
+ if (STy->hasName()) {
+ SmallString<16> TmpName = STy->getName();
+ STy->setName("");
+ DTy->setName(TmpName);
}
-#endif
+ DstStructTypesSet.addNonOpaque(DTy);
+}
+
+Type *TypeMapTy::get(Type *Ty) {
+ SmallPtrSet<StructType *, 8> Visited;
+ return get(Ty, Visited);
+}
+
+Type *TypeMapTy::get(Type *Ty, SmallPtrSet<StructType *, 8> &Visited) {
// If we already have an entry for this type, return it.
Type **Entry = &MappedTypes[Ty];
if (*Entry)
return *Entry;
- // If this is not a named struct type, then just map all of the elements and
- // then rebuild the type from inside out.
- if (!isa<StructType>(Ty) || cast<StructType>(Ty)->isLiteral()) {
- // If there are no element types to map, then the type is itself. This is
- // true for the anonymous {} struct, things like 'float', integers, etc.
- if (Ty->getNumContainedTypes() == 0)
- return *Entry = Ty;
+ // These are types that LLVM itself will unique.
+ bool IsUniqued = !isa<StructType>(Ty) || cast<StructType>(Ty)->isLiteral();
- // Remap all of the elements, keeping track of whether any of them change.
- bool AnyChange = false;
- SmallVector<Type*, 4> ElementTypes;
- ElementTypes.resize(Ty->getNumContainedTypes());
- for (unsigned I = 0, E = Ty->getNumContainedTypes(); I != E; ++I) {
- ElementTypes[I] = get(Ty->getContainedType(I));
- AnyChange |= ElementTypes[I] != Ty->getContainedType(I);
+#ifndef NDEBUG
+ if (!IsUniqued) {
+ for (auto &Pair : MappedTypes) {
+ assert(!(Pair.first != Ty && Pair.second == Ty) &&
+ "mapping to a source type");
}
+ }
+#endif
- // If we found our type while recursively processing stuff, just use it.
- Entry = &MappedTypes[Ty];
- if (*Entry)
- return *Entry;
+ if (!IsUniqued && !Visited.insert(cast<StructType>(Ty)).second) {
+ StructType *DTy = StructType::create(Ty->getContext());
+ return *Entry = DTy;
+ }
- // If all of the element types mapped directly over, then the type is usable
- // as-is.
- if (!AnyChange)
- return *Entry = Ty;
+ // If this is not a recursive type, then just map all of the elements and
+ // then rebuild the type from inside out.
+ SmallVector<Type *, 4> ElementTypes;
+
+ // If there are no element types to map, then the type is itself. This is
+ // true for the anonymous {} struct, things like 'float', integers, etc.
+ if (Ty->getNumContainedTypes() == 0 && IsUniqued)
+ return *Entry = Ty;
+
+ // Remap all of the elements, keeping track of whether any of them change.
+ bool AnyChange = false;
+ ElementTypes.resize(Ty->getNumContainedTypes());
+ for (unsigned I = 0, E = Ty->getNumContainedTypes(); I != E; ++I) {
+ ElementTypes[I] = get(Ty->getContainedType(I), Visited);
+ AnyChange |= ElementTypes[I] != Ty->getContainedType(I);
+ }
- // Otherwise, rebuild a modified type.
- switch (Ty->getTypeID()) {
- default:
- llvm_unreachable("unknown derived type to remap");
- case Type::ArrayTyID:
- return *Entry = ArrayType::get(ElementTypes[0],
- cast<ArrayType>(Ty)->getNumElements());
- case Type::VectorTyID:
- return *Entry = VectorType::get(ElementTypes[0],
- cast<VectorType>(Ty)->getNumElements());
- case Type::PointerTyID:
- return *Entry = PointerType::get(
- ElementTypes[0], cast<PointerType>(Ty)->getAddressSpace());
- case Type::FunctionTyID:
- return *Entry = FunctionType::get(ElementTypes[0],
- makeArrayRef(ElementTypes).slice(1),
- cast<FunctionType>(Ty)->isVarArg());
- case Type::StructTyID:
- // Note that this is only reached for anonymous structs.
- return *Entry = StructType::get(Ty->getContext(), ElementTypes,
- cast<StructType>(Ty)->isPacked());
+ // If we found our type while recursively processing stuff, just use it.
+ Entry = &MappedTypes[Ty];
+ if (*Entry) {
+ if (auto *DTy = dyn_cast<StructType>(*Entry)) {
+ if (DTy->isOpaque()) {
+ auto *STy = cast<StructType>(Ty);
+ finishType(DTy, STy, ElementTypes);
+ }
}
+ return *Entry;
}
- // Otherwise, this is an unmapped named struct. If the struct can be directly
- // mapped over, just use it as-is. This happens in a case when the linked-in
- // module has something like:
- // %T = type {%T*, i32}
- // @GV = global %T* null
- // where T does not exist at all in the destination module.
- //
- // The other case we watch for is when the type is not in the destination
- // module, but that it has to be rebuilt because it refers to something that
- // is already mapped. For example, if the destination module has:
- // %A = type { i32 }
- // and the source module has something like
- // %A' = type { i32 }
- // %B = type { %A'* }
- // @GV = global %B* null
- // then we want to create a new type: "%B = type { %A*}" and have it take the
- // pristine "%B" name from the source module.
- //
- // To determine which case this is, we have to recursively walk the type graph
- // speculating that we'll be able to reuse it unmodified. Only if this is
- // safe would we map the entire thing over. Because this is an optimization,
- // and is not required for the prettiness of the linked module, we just skip
- // it and always rebuild a type here.
- StructType *STy = cast<StructType>(Ty);
-
- // If the type is opaque, we can just use it directly.
- if (STy->isOpaque()) {
- // A named structure type from src module is used. Add it to the Set of
- // identified structs in the destination module.
- DstStructTypesSet.insert(STy);
- return *Entry = STy;
- }
-
- // Otherwise we create a new type.
- StructType *DTy = StructType::create(STy->getContext());
- // A new identified structure type was created. Add it to the set of
- // identified structs in the destination module.
- DstStructTypesSet.insert(DTy);
- *Entry = DTy;
-
- SmallVector<Type*, 4> ElementTypes;
- ElementTypes.resize(STy->getNumElements());
- for (unsigned I = 0, E = ElementTypes.size(); I != E; ++I)
- ElementTypes[I] = get(STy->getElementType(I));
- DTy->setBody(ElementTypes, STy->isPacked());
+ // If all of the element types mapped directly over and the type is not
+ // a nomed struct, then the type is usable as-is.
+ if (!AnyChange && IsUniqued)
+ return *Entry = Ty;
+
+ // Otherwise, rebuild a modified type.
+ switch (Ty->getTypeID()) {
+ default:
+ llvm_unreachable("unknown derived type to remap");
+ case Type::ArrayTyID:
+ return *Entry = ArrayType::get(ElementTypes[0],
+ cast<ArrayType>(Ty)->getNumElements());
+ case Type::VectorTyID:
+ return *Entry = VectorType::get(ElementTypes[0],
+ cast<VectorType>(Ty)->getNumElements());
+ case Type::PointerTyID:
+ return *Entry = PointerType::get(ElementTypes[0],
+ cast<PointerType>(Ty)->getAddressSpace());
+ case Type::FunctionTyID:
+ return *Entry = FunctionType::get(ElementTypes[0],
+ makeArrayRef(ElementTypes).slice(1),
+ cast<FunctionType>(Ty)->isVarArg());
+ case Type::StructTyID: {
+ auto *STy = cast<StructType>(Ty);
+ bool IsPacked = STy->isPacked();
+ if (IsUniqued)
+ return *Entry = StructType::get(Ty->getContext(), ElementTypes, IsPacked);
+
+ // If the type is opaque, we can just use it directly.
+ if (STy->isOpaque()) {
+ DstStructTypesSet.addOpaque(STy);
+ return *Entry = Ty;
+ }
- // Steal STy's name.
- if (STy->hasName()) {
- SmallString<16> TmpName = STy->getName();
- STy->setName("");
- DTy->setName(TmpName);
- }
+ if (StructType *OldT =
+ DstStructTypesSet.findNonOpaque(ElementTypes, IsPacked)) {
+ STy->setName("");
+ return *Entry = OldT;
+ }
- return DTy;
+ if (!AnyChange) {
+ DstStructTypesSet.addNonOpaque(STy);
+ return *Entry = Ty;
+ }
+
+ StructType *DTy = StructType::create(Ty->getContext());
+ finishType(DTy, STy, ElementTypes);
+ return *Entry = DTy;
+ }
+ }
}
//===----------------------------------------------------------------------===//
/// Creates prototypes for functions that are lazily linked on the fly. This
/// speeds up linking for modules with many/ lazily linked functions of which
/// few get used.
-class ValueMaterializerTy : public ValueMaterializer {
+class ValueMaterializerTy final : public ValueMaterializer {
TypeMapTy &TypeMap;
Module *DstM;
- std::vector<Function *> &LazilyLinkFunctions;
+ std::vector<GlobalValue *> &LazilyLinkGlobalValues;
+ ModuleLinker *ModLinker;
public:
ValueMaterializerTy(TypeMapTy &TypeMap, Module *DstM,
- std::vector<Function *> &LazilyLinkFunctions)
+ std::vector<GlobalValue *> &LazilyLinkGlobalValues,
+ ModuleLinker *ModLinker)
: ValueMaterializer(), TypeMap(TypeMap), DstM(DstM),
- LazilyLinkFunctions(LazilyLinkFunctions) {}
+ LazilyLinkGlobalValues(LazilyLinkGlobalValues), ModLinker(ModLinker) {}
Value *materializeValueFor(Value *V) override;
};
// Set of items not to link in from source.
SmallPtrSet<const Value *, 16> DoNotLinkFromSource;
- // Vector of functions to lazily link in.
- std::vector<Function *> LazilyLinkFunctions;
+ // Vector of GlobalValues to lazily link in.
+ std::vector<GlobalValue *> LazilyLinkGlobalValues;
+
+ DiagnosticHandlerFunction DiagnosticHandler;
+
+ /// For symbol clashes, prefer those from Src.
+ unsigned Flags;
+
+ /// Function index passed into ModuleLinker for using in function
+ /// importing/exporting handling.
+ FunctionInfoIndex *ImportIndex;
+
+ /// Function to import from source module, all other functions are
+ /// imported as declarations instead of definitions.
+ Function *ImportFunction;
- Linker::DiagnosticHandlerFunction DiagnosticHandler;
+ /// Set to true if the given FunctionInfoIndex contains any functions
+ /// from this source module, in which case we must conservatively assume
+ /// that any of its functions may be imported into another module
+ /// as part of a different backend compilation process.
+ bool HasExportedFunctions;
public:
- ModuleLinker(Module *dstM, TypeSet &Set, Module *srcM,
- Linker::DiagnosticHandlerFunction DiagnosticHandler)
+ ModuleLinker(Module *dstM, Linker::IdentifiedStructTypeSet &Set, Module *srcM,
+ DiagnosticHandlerFunction DiagnosticHandler, unsigned Flags,
+ FunctionInfoIndex *Index = nullptr,
+ Function *FuncToImport = nullptr)
: DstM(dstM), SrcM(srcM), TypeMap(Set),
- ValMaterializer(TypeMap, DstM, LazilyLinkFunctions),
- DiagnosticHandler(DiagnosticHandler) {}
+ ValMaterializer(TypeMap, DstM, LazilyLinkGlobalValues, this),
+ DiagnosticHandler(DiagnosticHandler), Flags(Flags), ImportIndex(Index),
+ ImportFunction(FuncToImport), HasExportedFunctions(false) {
+ assert((ImportIndex || !ImportFunction) &&
+ "Expect a FunctionInfoIndex when importing");
+ // If we have a FunctionInfoIndex but no function to import,
+ // then this is the primary module being compiled in a ThinLTO
+ // backend compilation, and we need to see if it has functions that
+ // may be exported to another backend compilation.
+ if (ImportIndex && !ImportFunction)
+ HasExportedFunctions = ImportIndex->hasExportedFunctions(SrcM);
+ }
bool run();
+ bool shouldOverrideFromSrc() { return Flags & Linker::OverrideFromSrc; }
+ bool shouldLinkOnlyNeeded() { return Flags & Linker::LinkOnlyNeeded; }
+ bool shouldInternalizeLinkedSymbols() {
+ return Flags & Linker::InternalizeLinkedSymbols;
+ }
+
+ /// Handles cloning of a global values from the source module into
+ /// the destination module, including setting the attributes and visibility.
+ GlobalValue *copyGlobalValueProto(TypeMapTy &TypeMap, const GlobalValue *SGV,
+ const GlobalValue *DGV = nullptr);
+
+ /// Check if we should promote the given local value to global scope.
+ bool doPromoteLocalToGlobal(const GlobalValue *SGV);
+
private:
bool shouldLinkFromSource(bool &LinkFromSrc, const GlobalValue &Dest,
const GlobalValue &Src);
const GlobalVariable *SrcGV);
bool linkGlobalValueProto(GlobalValue *GV);
- GlobalValue *linkGlobalVariableProto(const GlobalVariable *SGVar,
- GlobalValue *DGV, bool LinkFromSrc);
- GlobalValue *linkFunctionProto(const Function *SF, GlobalValue *DGV,
- bool LinkFromSrc);
- GlobalValue *linkGlobalAliasProto(const GlobalAlias *SGA, GlobalValue *DGV,
- bool LinkFromSrc);
-
bool linkModuleFlagsMetadata();
void linkAppendingVarInit(const AppendingVarInfo &AVI);
- void linkGlobalInits();
- void linkFunctionBody(Function *Dst, Function *Src);
- void linkAliasBodies();
+
+ void linkGlobalInit(GlobalVariable &Dst, GlobalVariable &Src);
+ bool linkFunctionBody(Function &Dst, Function &Src);
+ void linkAliasBody(GlobalAlias &Dst, GlobalAlias &Src);
+ bool linkGlobalValueBody(GlobalValue &Src);
+
+ /// Functions that take care of cloning a specific global value type
+ /// into the destination module.
+ GlobalVariable *copyGlobalVariableProto(TypeMapTy &TypeMap,
+ const GlobalVariable *SGVar);
+ Function *copyFunctionProto(TypeMapTy &TypeMap, const Function *SF);
+ GlobalValue *copyGlobalAliasProto(TypeMapTy &TypeMap, const GlobalAlias *SGA);
+
+ /// Helper methods to check if we are importing from or potentially
+ /// exporting from the current source module.
+ bool isPerformingImport() { return ImportFunction != nullptr; }
+ bool isModuleExporting() { return HasExportedFunctions; }
+
+ /// If we are importing from the source module, checks if we should
+ /// import SGV as a definition, otherwise import as a declaration.
+ bool doImportAsDefinition(const GlobalValue *SGV);
+
+ /// Get the name for SGV that should be used in the linked destination
+ /// module. Specifically, this handles the case where we need to rename
+ /// a local that is being promoted to global scope.
+ std::string getName(const GlobalValue *SGV);
+
+ /// Get the new linkage for SGV that should be used in the linked destination
+ /// module. Specifically, for ThinLTO importing or exporting it may need
+ /// to be adjusted.
+ GlobalValue::LinkageTypes getLinkage(const GlobalValue *SGV);
+
+ /// Copies the necessary global value attributes and name from the source
+ /// to the newly cloned global value.
+ void copyGVAttributes(GlobalValue *NewGV, const GlobalValue *SrcGV);
+
+ /// Updates the visibility for the new global cloned from the source
+ /// and, if applicable, linked with an existing destination global.
+ /// Handles visibility change required for promoted locals.
+ void setVisibility(GlobalValue *NewGV, const GlobalValue *SGV,
+ const GlobalValue *DGV = nullptr);
+
void linkNamedMDNodes();
};
}
static void forceRenaming(GlobalValue *GV, StringRef Name) {
// If the global doesn't force its name or if it already has the right name,
// there is nothing for us to do.
+ // Note that any required local to global promotion should already be done,
+ // so promoted locals will not skip this handling as their linkage is no
+ // longer local.
if (GV->hasLocalLinkage() || GV->getName() == Name)
return;
/// copy additional attributes (those not needed to construct a GlobalValue)
/// from the SrcGV to the DestGV.
-static void copyGVAttributes(GlobalValue *DestGV, const GlobalValue *SrcGV) {
- // Use the maximum alignment, rather than just copying the alignment of SrcGV.
- auto *DestGO = dyn_cast<GlobalObject>(DestGV);
- unsigned Alignment;
- if (DestGO)
- Alignment = std::max(DestGO->getAlignment(), SrcGV->getAlignment());
-
- DestGV->copyAttributesFrom(SrcGV);
-
- if (DestGO)
- DestGO->setAlignment(Alignment);
-
- forceRenaming(DestGV, SrcGV->getName());
+void ModuleLinker::copyGVAttributes(GlobalValue *NewGV,
+ const GlobalValue *SrcGV) {
+ auto *GA = dyn_cast<GlobalAlias>(SrcGV);
+ // Check for the special case of converting an alias (definition) to a
+ // non-alias (declaration). This can happen when we are importing and
+ // encounter a weak_any alias (weak_any defs may not be imported, see
+ // comments in ModuleLinker::getLinkage) or an alias whose base object is
+ // being imported as a declaration. In that case copy the attributes from the
+ // base object.
+ if (GA && !dyn_cast<GlobalAlias>(NewGV)) {
+ assert(isPerformingImport() &&
+ (GA->hasWeakAnyLinkage() ||
+ !doImportAsDefinition(GA->getBaseObject())));
+ NewGV->copyAttributesFrom(GA->getBaseObject());
+ } else
+ NewGV->copyAttributesFrom(SrcGV);
+ forceRenaming(NewGV, getName(SrcGV));
}
static bool isLessConstraining(GlobalValue::VisibilityTypes a,
return false;
}
+bool ModuleLinker::doImportAsDefinition(const GlobalValue *SGV) {
+ if (!isPerformingImport())
+ return false;
+ // Always import GlobalVariable definitions. The linkage changes
+ // described in ModuleLinker::getLinkage ensure the correct behavior (e.g.
+ // global variables with external linkage are transformed to
+ // available_externally defintions, which are ultimately turned into
+ // declaratios after the EliminateAvailableExternally pass).
+ if (dyn_cast<GlobalVariable>(SGV) && !SGV->isDeclaration())
+ return true;
+ // Only import the function requested for importing.
+ auto *SF = dyn_cast<Function>(SGV);
+ if (SF && SF == ImportFunction)
+ return true;
+ // Otherwise no.
+ return false;
+}
+
+bool ModuleLinker::doPromoteLocalToGlobal(const GlobalValue *SGV) {
+ assert(SGV->hasLocalLinkage());
+ // Both the imported references and the original local variable must
+ // be promoted.
+ if (!isPerformingImport() && !isModuleExporting())
+ return false;
+
+ // Local const variables never need to be promoted unless they are address
+ // taken. The imported uses can simply use the clone created in this module.
+ // For now we are conservative in determining which variables are not
+ // address taken by checking the unnamed addr flag. To be more aggressive,
+ // the address taken information must be checked earlier during parsing
+ // of the module and recorded in the function index for use when importing
+ // from that module.
+ auto *GVar = dyn_cast<GlobalVariable>(SGV);
+ if (GVar && GVar->isConstant() && GVar->hasUnnamedAddr())
+ return false;
+
+ // Eventually we only need to promote functions in the exporting module that
+ // are referenced by a potentially exported function (i.e. one that is in the
+ // function index).
+ return true;
+}
+
+std::string ModuleLinker::getName(const GlobalValue *SGV) {
+ // For locals that must be promoted to global scope, ensure that
+ // the promoted name uniquely identifies the copy in the original module,
+ // using the ID assigned during combined index creation. When importing,
+ // we rename all locals (not just those that are promoted) in order to
+ // avoid naming conflicts between locals imported from different modules.
+ if (SGV->hasLocalLinkage() &&
+ (doPromoteLocalToGlobal(SGV) || isPerformingImport()))
+ return FunctionInfoIndex::getGlobalNameForLocal(
+ SGV->getName(),
+ ImportIndex->getModuleId(SGV->getParent()->getModuleIdentifier()));
+ return SGV->getName();
+}
+
+GlobalValue::LinkageTypes ModuleLinker::getLinkage(const GlobalValue *SGV) {
+ // Any local variable that is referenced by an exported function needs
+ // to be promoted to global scope. Since we don't currently know which
+ // functions reference which local variables/functions, we must treat
+ // all as potentially exported if this module is exporting anything.
+ if (isModuleExporting()) {
+ if (SGV->hasLocalLinkage() && doPromoteLocalToGlobal(SGV))
+ return GlobalValue::ExternalLinkage;
+ return SGV->getLinkage();
+ }
+
+ // Otherwise, if we aren't importing, no linkage change is needed.
+ if (!isPerformingImport())
+ return SGV->getLinkage();
+
+ switch (SGV->getLinkage()) {
+ case GlobalValue::ExternalLinkage:
+ // External defnitions are converted to available_externally
+ // definitions upon import, so that they are available for inlining
+ // and/or optimization, but are turned into declarations later
+ // during the EliminateAvailableExternally pass.
+ if (doImportAsDefinition(SGV))
+ return GlobalValue::AvailableExternallyLinkage;
+ // An imported external declaration stays external.
+ return SGV->getLinkage();
+
+ case GlobalValue::AvailableExternallyLinkage:
+ // An imported available_externally definition converts
+ // to external if imported as a declaration.
+ if (!doImportAsDefinition(SGV))
+ return GlobalValue::ExternalLinkage;
+ // An imported available_externally declaration stays that way.
+ return SGV->getLinkage();
+
+ case GlobalValue::LinkOnceAnyLinkage:
+ case GlobalValue::LinkOnceODRLinkage:
+ // These both stay the same when importing the definition.
+ // The ThinLTO pass will eventually force-import their definitions.
+ return SGV->getLinkage();
+
+ case GlobalValue::WeakAnyLinkage:
+ // Can't import weak_any definitions correctly, or we might change the
+ // program semantics, since the linker will pick the first weak_any
+ // definition and importing would change the order they are seen by the
+ // linker. The module linking caller needs to enforce this.
+ assert(!doImportAsDefinition(SGV));
+ // If imported as a declaration, it becomes external_weak.
+ return GlobalValue::ExternalWeakLinkage;
+
+ case GlobalValue::WeakODRLinkage:
+ // For weak_odr linkage, there is a guarantee that all copies will be
+ // equivalent, so the issue described above for weak_any does not exist,
+ // and the definition can be imported. It can be treated similarly
+ // to an imported externally visible global value.
+ if (doImportAsDefinition(SGV))
+ return GlobalValue::AvailableExternallyLinkage;
+ else
+ return GlobalValue::ExternalLinkage;
+
+ case GlobalValue::AppendingLinkage:
+ // It would be incorrect to import an appending linkage variable,
+ // since it would cause global constructors/destructors to be
+ // executed multiple times. This should have already been handled
+ // by linkGlobalValueProto.
+ assert(false && "Cannot import appending linkage variable");
+
+ case GlobalValue::InternalLinkage:
+ case GlobalValue::PrivateLinkage:
+ // If we are promoting the local to global scope, it is handled
+ // similarly to a normal externally visible global.
+ if (doPromoteLocalToGlobal(SGV)) {
+ if (doImportAsDefinition(SGV))
+ return GlobalValue::AvailableExternallyLinkage;
+ else
+ return GlobalValue::ExternalLinkage;
+ }
+ // A non-promoted imported local definition stays local.
+ // The ThinLTO pass will eventually force-import their definitions.
+ return SGV->getLinkage();
+
+ case GlobalValue::ExternalWeakLinkage:
+ // External weak doesn't apply to definitions, must be a declaration.
+ assert(!doImportAsDefinition(SGV));
+ // Linkage stays external_weak.
+ return SGV->getLinkage();
+
+ case GlobalValue::CommonLinkage:
+ // Linkage stays common on definitions.
+ // The ThinLTO pass will eventually force-import their definitions.
+ return SGV->getLinkage();
+ }
+
+ llvm_unreachable("unknown linkage type");
+}
+
+/// Loop through the global variables in the src module and merge them into the
+/// dest module.
+GlobalVariable *
+ModuleLinker::copyGlobalVariableProto(TypeMapTy &TypeMap,
+ const GlobalVariable *SGVar) {
+ // No linking to be performed or linking from the source: simply create an
+ // identical version of the symbol over in the dest module... the
+ // initializer will be filled in later by LinkGlobalInits.
+ GlobalVariable *NewDGV = new GlobalVariable(
+ *DstM, TypeMap.get(SGVar->getType()->getElementType()),
+ SGVar->isConstant(), getLinkage(SGVar), /*init*/ nullptr, getName(SGVar),
+ /*insertbefore*/ nullptr, SGVar->getThreadLocalMode(),
+ SGVar->getType()->getAddressSpace());
+
+ return NewDGV;
+}
+
+/// Link the function in the source module into the destination module if
+/// needed, setting up mapping information.
+Function *ModuleLinker::copyFunctionProto(TypeMapTy &TypeMap,
+ const Function *SF) {
+ // If there is no linkage to be performed or we are linking from the source,
+ // bring SF over.
+ return Function::Create(TypeMap.get(SF->getFunctionType()), getLinkage(SF),
+ getName(SF), DstM);
+}
+
+/// Set up prototypes for any aliases that come over from the source module.
+GlobalValue *ModuleLinker::copyGlobalAliasProto(TypeMapTy &TypeMap,
+ const GlobalAlias *SGA) {
+ // If we are importing and encounter a weak_any alias, or an alias to
+ // an object being imported as a declaration, we must import the alias
+ // as a declaration as well, which involves converting it to a non-alias.
+ // See comments in ModuleLinker::getLinkage for why we cannot import
+ // weak_any defintions.
+ if (isPerformingImport() && (SGA->hasWeakAnyLinkage() ||
+ !doImportAsDefinition(SGA->getBaseObject()))) {
+ // Need to convert to declaration. All aliases must be definitions.
+ const GlobalValue *GVal = SGA->getBaseObject();
+ GlobalValue *NewGV;
+ if (auto *GVar = dyn_cast<GlobalVariable>(GVal))
+ NewGV = copyGlobalVariableProto(TypeMap, GVar);
+ else {
+ auto *F = dyn_cast<Function>(GVal);
+ assert(F);
+ NewGV = copyFunctionProto(TypeMap, F);
+ }
+ // Set the linkage to External or ExternalWeak (see comments in
+ // ModuleLinker::getLinkage for why WeakAny is converted to ExternalWeak).
+ if (SGA->hasWeakAnyLinkage())
+ NewGV->setLinkage(GlobalValue::ExternalWeakLinkage);
+ else
+ NewGV->setLinkage(GlobalValue::ExternalLinkage);
+ // Don't attempt to link body, needs to be a declaration.
+ DoNotLinkFromSource.insert(SGA);
+ return NewGV;
+ }
+ // If there is no linkage to be performed or we're linking from the source,
+ // bring over SGA.
+ auto *Ty = TypeMap.get(SGA->getValueType());
+ return GlobalAlias::create(Ty, SGA->getType()->getPointerAddressSpace(),
+ getLinkage(SGA), getName(SGA), DstM);
+}
+
+void ModuleLinker::setVisibility(GlobalValue *NewGV, const GlobalValue *SGV,
+ const GlobalValue *DGV) {
+ GlobalValue::VisibilityTypes Visibility = SGV->getVisibility();
+ if (DGV)
+ Visibility = isLessConstraining(Visibility, DGV->getVisibility())
+ ? DGV->getVisibility()
+ : Visibility;
+ // For promoted locals, mark them hidden so that they can later be
+ // stripped from the symbol table to reduce bloat.
+ if (SGV->hasLocalLinkage() && doPromoteLocalToGlobal(SGV))
+ Visibility = GlobalValue::HiddenVisibility;
+ NewGV->setVisibility(Visibility);
+}
+
+GlobalValue *ModuleLinker::copyGlobalValueProto(TypeMapTy &TypeMap,
+ const GlobalValue *SGV,
+ const GlobalValue *DGV) {
+ GlobalValue *NewGV;
+ if (auto *SGVar = dyn_cast<GlobalVariable>(SGV))
+ NewGV = copyGlobalVariableProto(TypeMap, SGVar);
+ else if (auto *SF = dyn_cast<Function>(SGV))
+ NewGV = copyFunctionProto(TypeMap, SF);
+ else
+ NewGV = copyGlobalAliasProto(TypeMap, cast<GlobalAlias>(SGV));
+ copyGVAttributes(NewGV, SGV);
+ setVisibility(NewGV, SGV, DGV);
+ return NewGV;
+}
+
Value *ValueMaterializerTy::materializeValueFor(Value *V) {
- Function *SF = dyn_cast<Function>(V);
- if (!SF)
+ auto *SGV = dyn_cast<GlobalValue>(V);
+ if (!SGV)
return nullptr;
- Function *DF = Function::Create(TypeMap.get(SF->getFunctionType()),
- SF->getLinkage(), SF->getName(), DstM);
- copyGVAttributes(DF, SF);
+ GlobalValue *DGV = ModLinker->copyGlobalValueProto(TypeMap, SGV);
- if (Comdat *SC = SF->getComdat()) {
- Comdat *DC = DstM->getOrInsertComdat(SC->getName());
- DF->setComdat(DC);
+ if (Comdat *SC = SGV->getComdat()) {
+ if (auto *DGO = dyn_cast<GlobalObject>(DGV)) {
+ Comdat *DC = DstM->getOrInsertComdat(SC->getName());
+ DGO->setComdat(DC);
+ }
}
- LazilyLinkFunctions.push_back(SF);
- return DF;
+ LazilyLinkGlobalValues.push_back(SGV);
+ return DGV;
}
bool ModuleLinker::getComdatLeader(Module *M, StringRef ComdatName,
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 (shouldOverrideFromSrc()) {
+ LinkFromSrc = true;
+ return false;
+ }
+
// We always have to add Src if it has appending linkage.
if (Src.hasAppendingLinkage()) {
+ // Caller should have already determined that we can't link from source
+ // when importing (see comments in linkGlobalValueProto).
+ assert(!isPerformingImport());
LinkFromSrc = true;
return false;
}
bool SrcIsDeclaration = Src.isDeclarationForLinker();
bool DestIsDeclaration = Dest.isDeclarationForLinker();
+ if (isPerformingImport()) {
+ if (isa<Function>(&Src)) {
+ // For functions, LinkFromSrc iff this is the function requested
+ // for importing. For variables, decide below normally.
+ LinkFromSrc = (&Src == ImportFunction);
+ return false;
+ }
+
+ // Check if this is an alias with an already existing definition
+ // in Dest, which must have come from a prior importing pass from
+ // the same Src module. Unlike imported function and variable
+ // definitions, which are imported as available_externally and are
+ // not definitions for the linker, that is not a valid linkage for
+ // imported aliases which must be definitions. Simply use the existing
+ // Dest copy.
+ if (isa<GlobalAlias>(&Src) && !DestIsDeclaration) {
+ assert(isa<GlobalAlias>(&Dest));
+ LinkFromSrc = false;
+ return false;
+ }
+ }
+
if (SrcIsDeclaration) {
// If Src is external or if both Src & Dest are external.. Just link the
// external globals, we aren't adding anything.
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;
// At this point, the destination module may have a type "%foo = { i32 }" for
// example. When the source module got loaded into the same LLVMContext, if
// it had the same type, it would have been renamed to "%foo.42 = { i32 }".
- TypeFinder SrcStructTypes;
- SrcStructTypes.run(*SrcM, true);
-
- for (StructType *ST : SrcStructTypes) {
+ std::vector<StructType *> Types = SrcM->getIdentifiedStructTypes();
+ for (StructType *ST : Types) {
if (!ST->hasName())
continue;
// we prefer to take the '%C' version. So we are then left with both
// '%C.1' and '%C' being used for the same types. This leads to some
// variables using one type and some using the other.
- if (TypeMap.DstStructTypesSet.count(DST))
+ if (TypeMap.DstStructTypesSet.hasType(DST))
TypeMap.addTypeMapping(DST, ST);
}
GlobalValue *DGV = getLinkedToGlobal(SGV);
// Handle the ultra special appending linkage case first.
+ assert(!DGV || SGV->hasAppendingLinkage() == DGV->hasAppendingLinkage());
+ if (SGV->hasAppendingLinkage() && isPerformingImport()) {
+ // Don't want to append to global_ctors list, for example, when we
+ // are importing for ThinLTO, otherwise the global ctors and dtors
+ // get executed multiple times for local variables (the latter causing
+ // double frees).
+ DoNotLinkFromSource.insert(SGV);
+ return false;
+ }
if (DGV && DGV->hasAppendingLinkage())
return linkAppendingVarProto(cast<GlobalVariable>(DGV),
cast<GlobalVariable>(SGV));
bool LinkFromSrc = true;
Comdat *C = nullptr;
- GlobalValue::VisibilityTypes Visibility = SGV->getVisibility();
bool HasUnnamedAddr = SGV->hasUnnamedAddr();
if (const Comdat *SC = SGV->getComdat()) {
ConstantExpr::getBitCast(DGV, TypeMap.get(SGV->getType()));
}
- if (DGV) {
- Visibility = isLessConstraining(Visibility, DGV->getVisibility())
- ? DGV->getVisibility()
- : Visibility;
+ if (DGV)
HasUnnamedAddr = HasUnnamedAddr && DGV->hasUnnamedAddr();
- }
if (!LinkFromSrc && !DGV)
return false;
GlobalValue *NewGV;
- if (auto *SGVar = dyn_cast<GlobalVariable>(SGV)) {
- NewGV = linkGlobalVariableProto(SGVar, DGV, LinkFromSrc);
- if (!NewGV)
- return true;
- } else if (auto *SF = dyn_cast<Function>(SGV)) {
- NewGV = linkFunctionProto(SF, DGV, LinkFromSrc);
+ if (!LinkFromSrc) {
+ NewGV = DGV;
+ // When linking from source we setVisibility from copyGlobalValueProto.
+ setVisibility(NewGV, SGV, DGV);
} else {
- NewGV = linkGlobalAliasProto(cast<GlobalAlias>(SGV), DGV, LinkFromSrc);
- }
-
- if (NewGV) {
- if (NewGV != DGV)
- copyGVAttributes(NewGV, SGV);
-
- NewGV->setUnnamedAddr(HasUnnamedAddr);
- NewGV->setVisibility(Visibility);
-
- if (auto *NewGO = dyn_cast<GlobalObject>(NewGV)) {
- if (C)
- NewGO->setComdat(C);
+ // 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 && !shouldOverrideFromSrc() && SGV != ImportFunction &&
+ (SGV->hasLocalLinkage() || SGV->hasLinkOnceLinkage() ||
+ SGV->hasAvailableExternallyLinkage())) {
+ DoNotLinkFromSource.insert(SGV);
+ return false;
}
- // Make sure to remember this mapping.
- if (NewGV != DGV) {
- if (DGV) {
- DGV->replaceAllUsesWith(
- ConstantExpr::getBitCast(NewGV, DGV->getType()));
- DGV->eraseFromParent();
- }
- ValueMap[SGV] = NewGV;
+ // When we only want to link in unresolved dependencies, blacklist
+ // the symbol unless unless DestM has a matching declaration (DGV).
+ if (shouldLinkOnlyNeeded() && !(DGV && DGV->isDeclaration())) {
+ DoNotLinkFromSource.insert(SGV);
+ return false;
}
- }
- return false;
-}
+ NewGV = copyGlobalValueProto(TypeMap, SGV, DGV);
+ }
-/// Loop through the global variables in the src module and merge them into the
-/// dest module.
-GlobalValue *ModuleLinker::linkGlobalVariableProto(const GlobalVariable *SGVar,
- GlobalValue *DGV,
- bool LinkFromSrc) {
- unsigned Alignment = 0;
- bool ClearConstant = false;
+ NewGV->setUnnamedAddr(HasUnnamedAddr);
- if (DGV) {
- if (DGV->hasCommonLinkage() && SGVar->hasCommonLinkage())
- Alignment = std::max(SGVar->getAlignment(), DGV->getAlignment());
+ if (auto *NewGO = dyn_cast<GlobalObject>(NewGV)) {
+ if (C)
+ NewGO->setComdat(C);
- auto *DGVar = dyn_cast<GlobalVariable>(DGV);
- if (!SGVar->isConstant() || (DGVar && !DGVar->isConstant()))
- ClearConstant = true;
+ if (DGV && DGV->hasCommonLinkage() && SGV->hasCommonLinkage())
+ NewGO->setAlignment(std::max(DGV->getAlignment(), SGV->getAlignment()));
}
- if (!LinkFromSrc) {
- if (auto *NewGVar = dyn_cast<GlobalVariable>(DGV)) {
- if (Alignment)
- NewGVar->setAlignment(Alignment);
- if (NewGVar->isDeclaration() && ClearConstant)
- NewGVar->setConstant(false);
- }
- return DGV;
+ if (auto *NewGVar = dyn_cast<GlobalVariable>(NewGV)) {
+ auto *DGVar = dyn_cast_or_null<GlobalVariable>(DGV);
+ auto *SGVar = dyn_cast<GlobalVariable>(SGV);
+ if (DGVar && SGVar && DGVar->isDeclaration() && SGVar->isDeclaration() &&
+ (!DGVar->isConstant() || !SGVar->isConstant()))
+ NewGVar->setConstant(false);
}
- // No linking to be performed or linking from the source: simply create an
- // identical version of the symbol over in the dest module... the
- // initializer will be filled in later by LinkGlobalInits.
- GlobalVariable *NewDGV = new GlobalVariable(
- *DstM, TypeMap.get(SGVar->getType()->getElementType()),
- SGVar->isConstant(), SGVar->getLinkage(), /*init*/ nullptr,
- SGVar->getName(), /*insertbefore*/ nullptr, SGVar->getThreadLocalMode(),
- SGVar->getType()->getAddressSpace());
-
- if (Alignment)
- NewDGV->setAlignment(Alignment);
-
- return NewDGV;
-}
-
-/// Link the function in the source module into the destination module if
-/// needed, setting up mapping information.
-GlobalValue *ModuleLinker::linkFunctionProto(const Function *SF,
- GlobalValue *DGV,
- bool LinkFromSrc) {
- if (!LinkFromSrc)
- return DGV;
-
- // If the function is to be lazily linked, don't create it just yet.
- // The ValueMaterializerTy will deal with creating it if it's used.
- if (!DGV && (SF->hasLocalLinkage() || SF->hasLinkOnceLinkage() ||
- SF->hasAvailableExternallyLinkage())) {
- DoNotLinkFromSource.insert(SF);
- return nullptr;
+ // Make sure to remember this mapping.
+ if (NewGV != DGV) {
+ if (DGV) {
+ DGV->replaceAllUsesWith(ConstantExpr::getBitCast(NewGV, DGV->getType()));
+ DGV->eraseFromParent();
+ }
+ ValueMap[SGV] = NewGV;
}
- // If there is no linkage to be performed or we are linking from the source,
- // bring SF over.
- return Function::Create(TypeMap.get(SF->getFunctionType()), SF->getLinkage(),
- SF->getName(), DstM);
-}
-
-/// Set up prototypes for any aliases that come over from the source module.
-GlobalValue *ModuleLinker::linkGlobalAliasProto(const GlobalAlias *SGA,
- GlobalValue *DGV,
- bool LinkFromSrc) {
- if (!LinkFromSrc)
- return DGV;
-
- // 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 false;
}
static void getArrayElements(const Constant *C,
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());
/// Update the initializers in the Dest module now that all globals that may be
/// referenced are in Dest.
-void ModuleLinker::linkGlobalInits() {
- // Loop over all of the globals in the src module, mapping them over as we go
- for (Module::const_global_iterator I = SrcM->global_begin(),
- E = SrcM->global_end(); I != E; ++I) {
-
- // Only process initialized GV's or ones not already in dest.
- if (!I->hasInitializer() || DoNotLinkFromSource.count(I)) continue;
-
- // Grab destination global variable.
- GlobalVariable *DGV = cast<GlobalVariable>(ValueMap[I]);
- // Figure out what the initializer looks like in the dest module.
- DGV->setInitializer(MapValue(I->getInitializer(), ValueMap,
- RF_None, &TypeMap, &ValMaterializer));
- }
+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_MoveDistinctMDs, &TypeMap, &ValMaterializer));
}
/// Copy the source function over into the dest function and fix up references
/// to values. At this point we know that Dest is an external function, and
/// that Src is not.
-void ModuleLinker::linkFunctionBody(Function *Dst, Function *Src) {
- assert(Src && Dst && Dst->isDeclaration() && !Src->isDeclaration());
+bool ModuleLinker::linkFunctionBody(Function &Dst, Function &Src) {
+ assert(Dst.isDeclaration() && !Src.isDeclaration());
+
+ // Materialize if needed.
+ if (std::error_code EC = Src.materialize())
+ return emitError(EC.message());
+
+ // Link in the prefix data.
+ if (Src.hasPrefixData())
+ 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_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();
- for (Function::arg_iterator I = Src->arg_begin(), E = Src->arg_end();
- I != E; ++I, ++DI) {
- DI->setName(I->getName()); // Copy the name over.
+ Function::arg_iterator DI = Dst.arg_begin();
+ for (Argument &Arg : Src.args()) {
+ DI->setName(Arg.getName()); // Copy the name over.
// Add a mapping to our mapping.
- ValueMap[I] = DI;
+ ValueMap[&Arg] = &*DI;
+ ++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());
+ Dst.getBasicBlockList().splice(Dst.end(), Src.getBasicBlockList());
// At this point, all of the instructions and values of the function are now
// copied over. The only problem is that they are still referencing values in
// the Source function as operands. Loop through all of the operands of the
// functions and patch them up to point to the local versions.
- for (Function::iterator BB = Dst->begin(), BE = Dst->end(); BB != BE; ++BB)
- for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I)
- RemapInstruction(I, ValueMap, RF_IgnoreMissingEntries, &TypeMap,
+ for (BasicBlock &BB : Dst)
+ for (Instruction &I : BB)
+ RemapInstruction(&I, ValueMap,
+ RF_IgnoreMissingEntries | RF_MoveDistinctMDs, &TypeMap,
&ValMaterializer);
// There is no need to map the arguments anymore.
- for (Function::arg_iterator I = Src->arg_begin(), E = Src->arg_end();
- I != E; ++I)
- ValueMap.erase(I);
+ for (Argument &Arg : Src.args())
+ ValueMap.erase(&Arg);
+
+ Src.dematerialize();
+ return false;
+}
+void ModuleLinker::linkAliasBody(GlobalAlias &Dst, GlobalAlias &Src) {
+ Constant *Aliasee = Src.getAliasee();
+ Constant *Val = MapValue(Aliasee, ValueMap, RF_MoveDistinctMDs, &TypeMap,
+ &ValMaterializer);
+ Dst.setAliasee(Val);
}
-/// Insert all of the aliases in Src into the Dest module.
-void ModuleLinker::linkAliasBodies() {
- for (Module::alias_iterator I = SrcM->alias_begin(), E = SrcM->alias_end();
- I != E; ++I) {
- if (DoNotLinkFromSource.count(I))
- continue;
- if (Constant *Aliasee = I->getAliasee()) {
- GlobalAlias *DA = cast<GlobalAlias>(ValueMap[I]);
- Constant *Val =
- MapValue(Aliasee, ValueMap, RF_None, &TypeMap, &ValMaterializer);
- DA->setAliasee(Val);
- }
+bool ModuleLinker::linkGlobalValueBody(GlobalValue &Src) {
+ Value *Dst = ValueMap[&Src];
+ assert(Dst);
+ if (shouldInternalizeLinkedSymbols())
+ if (auto *DGV = dyn_cast<GlobalValue>(Dst))
+ DGV->setLinkage(GlobalValue::InternalLinkage);
+ if (auto *F = dyn_cast<Function>(&Src))
+ return linkFunctionBody(cast<Function>(*Dst), *F);
+ if (auto *GVar = dyn_cast<GlobalVariable>(&Src)) {
+ linkGlobalInit(cast<GlobalVariable>(*Dst), *GVar);
+ return false;
}
+ linkAliasBody(cast<GlobalAlias>(*Dst), cast<GlobalAlias>(Src));
+ return false;
}
/// 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(MapValue(I->getOperand(i), ValueMap,
- RF_None, &TypeMap, &ValMaterializer));
+ for (const MDNode *op : NMD.operands())
+ DestNMD->addOperand(MapMetadata(op, ValueMap, RF_MoveDistinctMDs,
+ &TypeMap, &ValMaterializer));
}
}
}
// First build a map of the existing module flags and requirements.
- DenseMap<MDString*, MDNode*> Flags;
+ DenseMap<MDString *, std::pair<MDNode *, unsigned>> Flags;
SmallSetVector<MDNode*, 16> Requirements;
for (unsigned I = 0, E = DstModFlags->getNumOperands(); I != E; ++I) {
MDNode *Op = DstModFlags->getOperand(I);
- ConstantInt *Behavior = cast<ConstantInt>(Op->getOperand(0));
+ ConstantInt *Behavior = mdconst::extract<ConstantInt>(Op->getOperand(0));
MDString *ID = cast<MDString>(Op->getOperand(1));
if (Behavior->getZExtValue() == Module::Require) {
Requirements.insert(cast<MDNode>(Op->getOperand(2)));
} else {
- Flags[ID] = Op;
+ Flags[ID] = std::make_pair(Op, I);
}
}
bool HasErr = false;
for (unsigned I = 0, E = SrcModFlags->getNumOperands(); I != E; ++I) {
MDNode *SrcOp = SrcModFlags->getOperand(I);
- ConstantInt *SrcBehavior = cast<ConstantInt>(SrcOp->getOperand(0));
+ ConstantInt *SrcBehavior =
+ mdconst::extract<ConstantInt>(SrcOp->getOperand(0));
MDString *ID = cast<MDString>(SrcOp->getOperand(1));
- MDNode *DstOp = Flags.lookup(ID);
+ MDNode *DstOp;
+ unsigned DstIndex;
+ std::tie(DstOp, DstIndex) = Flags.lookup(ID);
unsigned SrcBehaviorValue = SrcBehavior->getZExtValue();
// If this is a requirement, add it and continue.
// If there is no existing flag with this ID, just add it.
if (!DstOp) {
- Flags[ID] = SrcOp;
+ Flags[ID] = std::make_pair(SrcOp, DstModFlags->getNumOperands());
DstModFlags->addOperand(SrcOp);
continue;
}
// Otherwise, perform a merge.
- ConstantInt *DstBehavior = cast<ConstantInt>(DstOp->getOperand(0));
+ ConstantInt *DstBehavior =
+ mdconst::extract<ConstantInt>(DstOp->getOperand(0));
unsigned DstBehaviorValue = DstBehavior->getZExtValue();
// If either flag has override behavior, handle it first.
continue;
} else if (SrcBehaviorValue == Module::Override) {
// Update the destination flag to that of the source.
- DstOp->replaceOperandWith(0, SrcBehavior);
- DstOp->replaceOperandWith(2, SrcOp->getOperand(2));
+ DstModFlags->setOperand(DstIndex, SrcOp);
+ Flags[ID].first = SrcOp;
continue;
}
continue;
}
+ auto replaceDstValue = [&](MDNode *New) {
+ Metadata *FlagOps[] = {DstOp->getOperand(0), ID, New};
+ MDNode *Flag = MDNode::get(DstM->getContext(), FlagOps);
+ DstModFlags->setOperand(DstIndex, Flag);
+ Flags[ID].first = Flag;
+ };
+
// Perform the merge for standard behavior types.
switch (SrcBehaviorValue) {
case Module::Require:
case Module::Append: {
MDNode *DstValue = cast<MDNode>(DstOp->getOperand(2));
MDNode *SrcValue = cast<MDNode>(SrcOp->getOperand(2));
- unsigned NumOps = DstValue->getNumOperands() + SrcValue->getNumOperands();
- Value **VP, **Values = VP = new Value*[NumOps];
- for (unsigned i = 0, e = DstValue->getNumOperands(); i != e; ++i, ++VP)
- *VP = DstValue->getOperand(i);
- for (unsigned i = 0, e = SrcValue->getNumOperands(); i != e; ++i, ++VP)
- *VP = SrcValue->getOperand(i);
- DstOp->replaceOperandWith(2, MDNode::get(DstM->getContext(),
- ArrayRef<Value*>(Values,
- NumOps)));
- delete[] Values;
+ SmallVector<Metadata *, 8> MDs;
+ MDs.reserve(DstValue->getNumOperands() + SrcValue->getNumOperands());
+ MDs.append(DstValue->op_begin(), DstValue->op_end());
+ MDs.append(SrcValue->op_begin(), SrcValue->op_end());
+
+ replaceDstValue(MDNode::get(DstM->getContext(), MDs));
break;
}
case Module::AppendUnique: {
- SmallSetVector<Value*, 16> Elts;
+ 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));
- DstOp->replaceOperandWith(2, MDNode::get(DstM->getContext(),
- ArrayRef<Value*>(Elts.begin(),
- Elts.end())));
+ 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())));
break;
}
}
for (unsigned I = 0, E = Requirements.size(); I != E; ++I) {
MDNode *Requirement = Requirements[I];
MDString *Flag = cast<MDString>(Requirement->getOperand(0));
- Value *ReqValue = Requirement->getOperand(1);
+ Metadata *ReqValue = Requirement->getOperand(1);
- MDNode *Op = Flags[Flag];
+ MDNode *Op = Flags[Flag].first;
if (!Op || Op->getOperand(2) != ReqValue) {
HasErr |= emitError("linking module flags '" + Flag->getString() +
"': does not have the required value");
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());
+ if (GV)
+ MapValue(GV, ValueMap, RF_MoveDistinctMDs, &TypeMap, &ValMaterializer);
+ }
// Link in the function bodies that are defined in the source module into
// DstM.
- for (Module::iterator SF = SrcM->begin(), E = SrcM->end(); SF != E; ++SF) {
+ for (Function &SF : *SrcM) {
+ // Skip if no body (function is external).
+ if (SF.isDeclaration())
+ continue;
+
// Skip if not linking from source.
- if (DoNotLinkFromSource.count(SF)) continue;
+ if (DoNotLinkFromSource.count(&SF))
+ continue;
- Function *DF = cast<Function>(ValueMap[SF]);
- if (SF->hasPrefixData()) {
- // Link in the prefix data.
- DF->setPrefixData(MapValue(
- SF->getPrefixData(), ValueMap, RF_None, &TypeMap, &ValMaterializer));
- }
+ // When importing, only materialize the function requested for import.
+ if (isPerformingImport() && &SF != ImportFunction)
+ continue;
- // Materialize if needed.
- if (std::error_code EC = SF->materialize())
- return emitError(EC.message());
+ if (linkGlobalValueBody(SF))
+ return true;
+ }
- // Skip if no body (function is external).
- if (SF->isDeclaration())
+ // Resolve all uses of aliases with aliasees.
+ for (GlobalAlias &Src : SrcM->aliases()) {
+ if (DoNotLinkFromSource.count(&Src))
continue;
+ linkGlobalValueBody(Src);
+ }
- linkFunctionBody(DF, SF);
- SF->Dematerialize();
+ // Update the initializers in the DstM module now that all globals that may
+ // be referenced are in DstM.
+ for (GlobalVariable &Src : SrcM->globals()) {
+ // Only process initialized GV's or ones not already in dest.
+ if (!Src.hasInitializer() || DoNotLinkFromSource.count(&Src))
+ continue;
+ linkGlobalValueBody(Src);
}
- // Resolve all uses of aliases with aliasees.
- linkAliasBodies();
+ // Process vector of lazily linked in functions.
+ while (!LazilyLinkGlobalValues.empty()) {
+ GlobalValue *SGV = LazilyLinkGlobalValues.back();
+ LazilyLinkGlobalValues.pop_back();
+ if (isPerformingImport() && !doImportAsDefinition(SGV))
+ continue;
+
+ // Skip declarations that ValueMaterializer may have created in
+ // case we link in only some of SrcM.
+ if (shouldLinkOnlyNeeded() && SGV->isDeclaration())
+ continue;
+
+ assert(!SGV->isDeclaration() && "users should not pass down decls");
+ if (linkGlobalValueBody(*SGV))
+ return true;
+ }
// Remap all of the named MDNodes in Src into the DstM module. We do this
// after linking GlobalValues so that MDNodes that reference GlobalValues
if (linkModuleFlagsMetadata())
return true;
- // Update the initializers in the DstM module now that all globals that may
- // be referenced are in DstM.
- linkGlobalInits();
+ return false;
+}
- // Process vector of lazily linked in functions.
- bool LinkedInAnyFunctions;
- do {
- LinkedInAnyFunctions = false;
-
- for(std::vector<Function*>::iterator I = LazilyLinkFunctions.begin(),
- E = LazilyLinkFunctions.end(); I != E; ++I) {
- Function *SF = *I;
- if (!SF)
- continue;
+Linker::StructTypeKeyInfo::KeyTy::KeyTy(ArrayRef<Type *> E, bool P)
+ : ETypes(E), IsPacked(P) {}
- Function *DF = cast<Function>(ValueMap[SF]);
- if (SF->hasPrefixData()) {
- // Link in the prefix data.
- DF->setPrefixData(MapValue(SF->getPrefixData(),
- ValueMap,
- RF_None,
- &TypeMap,
- &ValMaterializer));
- }
+Linker::StructTypeKeyInfo::KeyTy::KeyTy(const StructType *ST)
+ : ETypes(ST->elements()), IsPacked(ST->isPacked()) {}
+
+bool Linker::StructTypeKeyInfo::KeyTy::operator==(const KeyTy &That) const {
+ if (IsPacked != That.IsPacked)
+ return false;
+ if (ETypes != That.ETypes)
+ return false;
+ return true;
+}
- // Materialize if needed.
- if (std::error_code EC = SF->materialize())
- return emitError(EC.message());
+bool Linker::StructTypeKeyInfo::KeyTy::operator!=(const KeyTy &That) const {
+ return !this->operator==(That);
+}
- // Skip if no body (function is external).
- if (SF->isDeclaration())
- continue;
+StructType *Linker::StructTypeKeyInfo::getEmptyKey() {
+ return DenseMapInfo<StructType *>::getEmptyKey();
+}
- // Erase from vector *before* the function body is linked - linkFunctionBody could
- // invalidate I.
- LazilyLinkFunctions.erase(I);
+StructType *Linker::StructTypeKeyInfo::getTombstoneKey() {
+ return DenseMapInfo<StructType *>::getTombstoneKey();
+}
- // Link in function body.
- linkFunctionBody(DF, SF);
- SF->Dematerialize();
+unsigned Linker::StructTypeKeyInfo::getHashValue(const KeyTy &Key) {
+ return hash_combine(hash_combine_range(Key.ETypes.begin(), Key.ETypes.end()),
+ Key.IsPacked);
+}
- // Set flag to indicate we may have more functions to lazily link in
- // since we linked in a function.
- LinkedInAnyFunctions = true;
- break;
- }
- } while (LinkedInAnyFunctions);
+unsigned Linker::StructTypeKeyInfo::getHashValue(const StructType *ST) {
+ return getHashValue(KeyTy(ST));
+}
- return false;
+bool Linker::StructTypeKeyInfo::isEqual(const KeyTy &LHS,
+ const StructType *RHS) {
+ if (RHS == getEmptyKey() || RHS == getTombstoneKey())
+ return false;
+ return LHS == KeyTy(RHS);
+}
+
+bool Linker::StructTypeKeyInfo::isEqual(const StructType *LHS,
+ const StructType *RHS) {
+ if (RHS == getEmptyKey())
+ return LHS == getEmptyKey();
+
+ if (RHS == getTombstoneKey())
+ return LHS == getTombstoneKey();
+
+ return KeyTy(LHS) == KeyTy(RHS);
+}
+
+void Linker::IdentifiedStructTypeSet::addNonOpaque(StructType *Ty) {
+ assert(!Ty->isOpaque());
+ 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);
+}
+
+StructType *
+Linker::IdentifiedStructTypeSet::findNonOpaque(ArrayRef<Type *> ETypes,
+ bool IsPacked) {
+ Linker::StructTypeKeyInfo::KeyTy Key(ETypes, IsPacked);
+ auto I = NonOpaqueStructTypes.find_as(Key);
+ if (I == NonOpaqueStructTypes.end())
+ return nullptr;
+ return *I;
+}
+
+bool Linker::IdentifiedStructTypeSet::hasType(StructType *Ty) {
+ if (Ty->isOpaque())
+ return OpaqueStructTypes.count(Ty);
+ auto I = NonOpaqueStructTypes.find(Ty);
+ if (I == NonOpaqueStructTypes.end())
+ return false;
+ return *I == Ty;
}
void Linker::init(Module *M, DiagnosticHandlerFunction DiagnosticHandler) {
TypeFinder StructTypes;
StructTypes.run(*M, true);
- IdentifiedStructTypes.insert(StructTypes.begin(), StructTypes.end());
+ for (StructType *Ty : StructTypes) {
+ if (Ty->isOpaque())
+ IdentifiedStructTypes.addOpaque(Ty);
+ else
+ IdentifiedStructTypes.addNonOpaque(Ty);
+ }
}
Linker::Linker(Module *M, DiagnosticHandlerFunction DiagnosticHandler) {
});
}
-Linker::~Linker() {
-}
-
void Linker::deleteModule() {
delete Composite;
Composite = nullptr;
}
-bool Linker::linkInModule(Module *Src) {
+bool Linker::linkInModule(Module *Src, unsigned Flags, FunctionInfoIndex *Index,
+ Function *FuncToImport) {
ModuleLinker TheLinker(Composite, IdentifiedStructTypes, Src,
- DiagnosticHandler);
- return TheLinker.run();
+ DiagnosticHandler, Flags, Index, FuncToImport);
+ bool RetCode = TheLinker.run();
+ Composite->dropTriviallyDeadConstantArrays();
+ return RetCode;
+}
+
+void Linker::setModule(Module *Dst) {
+ init(Dst, DiagnosticHandler);
}
//===----------------------------------------------------------------------===//
/// Upon failure, the Dest module could be in a modified state, and shouldn't be
/// relied on to be consistent.
bool Linker::LinkModules(Module *Dest, Module *Src,
- DiagnosticHandlerFunction DiagnosticHandler) {
+ DiagnosticHandlerFunction DiagnosticHandler,
+ unsigned Flags) {
Linker L(Dest, DiagnosticHandler);
- return L.linkInModule(Src);
+ return L.linkInModule(Src, Flags);
}
-bool Linker::LinkModules(Module *Dest, Module *Src) {
+bool Linker::LinkModules(Module *Dest, Module *Src, unsigned Flags) {
Linker L(Dest);
- return L.linkInModule(Src);
+ return L.linkInModule(Src, Flags);
}
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
LLVMBool LLVMLinkModules(LLVMModuleRef Dest, LLVMModuleRef Src,
- LLVMLinkerMode Mode, 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;
}
projects / oota-llvm.git / blobdiff