//===----------------------------------------------------------------------===//
#include "llvm/Linker.h"
-#include "llvm/Constants.h"
-#include "llvm/DerivedTypes.h"
-#include "llvm/Instructions.h"
-#include "llvm/Module.h"
-#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm-c/Linker.h"
+#include "llvm/ADT/Optional.h"
+#include "llvm/ADT/SetVector.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/Module.h"
+#include "llvm/IR/TypeFinder.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
-#include "llvm/Support/Path.h"
#include "llvm/Transforms/Utils/Cloning.h"
-#include "llvm/Transforms/Utils/ValueMapper.h"
+#include <cctype>
using namespace llvm;
+
//===----------------------------------------------------------------------===//
// TypeMap implementation.
//===----------------------------------------------------------------------===//
namespace {
+ typedef SmallPtrSet<StructType*, 32> TypeSet;
+
class TypeMapTy : public ValueMapTypeRemapper {
/// MappedTypes - This is a mapping from a source type to a destination type
/// to use.
/// case we need to roll back.
SmallVector<Type*, 16> SpeculativeTypes;
- /// DefinitionsToResolve - This is a list of non-opaque structs in the source
- /// module that are mapped to an opaque struct in the destination module.
- SmallVector<StructType*, 16> DefinitionsToResolve;
-public:
+ /// SrcDefinitionsToResolve - This is a list of non-opaque structs in the
+ /// source module that are mapped to an opaque struct in the destination
+ /// module.
+ SmallVector<StructType*, 16> SrcDefinitionsToResolve;
+ /// DstResolvedOpaqueTypes - This is the set of opaque types in the
+ /// destination modules who are getting a body from the source module.
+ SmallPtrSet<StructType*, 16> DstResolvedOpaqueTypes;
+
+public:
+ TypeMapTy(TypeSet &Set) : DstStructTypesSet(Set) {}
+
+ TypeSet &DstStructTypesSet;
/// addTypeMapping - Indicate that the specified type in the destination
/// module is conceptually equivalent to the specified type in the source
/// module.
FunctionType *get(FunctionType *T) {return cast<FunctionType>(get((Type*)T));}
+ /// dump - Dump out the type map for debugging purposes.
+ void dump() const {
+ for (DenseMap<Type*, Type*>::const_iterator
+ I = MappedTypes.begin(), E = MappedTypes.end(); I != E; ++I) {
+ dbgs() << "TypeMap: ";
+ I->first->dump();
+ dbgs() << " => ";
+ I->second->dump();
+ dbgs() << '\n';
+ }
+ }
+
private:
Type *getImpl(Type *T);
/// remapType - Implement the ValueMapTypeRemapper interface.
- Type *remapType(Type *SrcTy) {
+ Type *remapType(Type *SrcTy) override {
return get(SrcTy);
}
return true;
}
- // Mapping a non-opaque source type to an opaque dest. Keep the dest, but
- // fill it in later. This doesn't need to be speculative.
+ // Mapping a non-opaque source type to an opaque dest. If this is the first
+ // type that we're mapping onto this destination type then we succeed. Keep
+ // the dest, but fill it in later. This doesn't need to be speculative. If
+ // this is the second (different) type that we're trying to map onto the
+ // same opaque type then we fail.
if (cast<StructType>(DstTy)->isOpaque()) {
+ // We can only map one source type onto the opaque destination type.
+ if (!DstResolvedOpaqueTypes.insert(cast<StructType>(DstTy)))
+ return false;
+ SrcDefinitionsToResolve.push_back(SSTy);
Entry = DstTy;
- DefinitionsToResolve.push_back(SSTy);
return true;
}
}
if (PointerType *PT = dyn_cast<PointerType>(DstTy)) {
if (PT->getAddressSpace() != cast<PointerType>(SrcTy)->getAddressSpace())
return false;
+
} else if (FunctionType *FT = dyn_cast<FunctionType>(DstTy)) {
if (FT->isVarArg() != cast<FunctionType>(SrcTy)->isVarArg())
return false;
if (DATy->getNumElements() != cast<ArrayType>(SrcTy)->getNumElements())
return false;
} else if (VectorType *DVTy = dyn_cast<VectorType>(DstTy)) {
- if (DVTy->getNumElements() != cast<ArrayType>(SrcTy)->getNumElements())
+ if (DVTy->getNumElements() != cast<VectorType>(SrcTy)->getNumElements())
return false;
}
SmallString<16> TmpName;
// Note that processing entries in this loop (calling 'get') can add new
- // entries to the DefinitionsToResolve vector.
- while (!DefinitionsToResolve.empty()) {
- StructType *SrcSTy = DefinitionsToResolve.pop_back_val();
+ // entries to the SrcDefinitionsToResolve vector.
+ while (!SrcDefinitionsToResolve.empty()) {
+ StructType *SrcSTy = SrcDefinitionsToResolve.pop_back_val();
StructType *DstSTy = cast<StructType>(MappedTypes[SrcSTy]);
// TypeMap is a many-to-one mapping, if there were multiple types that
TmpName.clear();
}
}
+
+ DstResolvedOpaqueTypes.clear();
}
-
/// get - Return the mapped type to use for the specified input type from the
/// source module.
Type *TypeMapTy::get(Type *Ty) {
Type *Result = getImpl(Ty);
// If this caused a reference to any struct type, resolve it before returning.
- if (!DefinitionsToResolve.empty())
+ if (!SrcDefinitionsToResolve.empty())
linkDefinedTypeBodies();
return Result;
}
// Otherwise, rebuild a modified type.
switch (Ty->getTypeID()) {
- default: assert(0 && "unknown derived type to remap");
+ default: llvm_unreachable("unknown derived type to remap");
case Type::ArrayTyID:
return *Entry = ArrayType::get(ElementTypes[0],
cast<ArrayType>(Ty)->getNumElements());
StructType *STy = cast<StructType>(Ty);
// If the type is opaque, we can just use it directly.
- if (STy->isOpaque())
+ 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 and resolve its body later. This will be
// resolved by the top level of get().
- DefinitionsToResolve.push_back(STy);
- return *Entry = StructType::create(STy->getContext());
+ SrcDefinitionsToResolve.push_back(STy);
+ 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);
+ DstResolvedOpaqueTypes.insert(DTy);
+ return *Entry = DTy;
}
-
-
//===----------------------------------------------------------------------===//
// ModuleLinker implementation.
//===----------------------------------------------------------------------===//
namespace {
+ class ModuleLinker;
+
+ /// ValueMaterializerTy - 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 {
+ TypeMapTy &TypeMap;
+ Module *DstM;
+ std::vector<Function*> &LazilyLinkFunctions;
+ public:
+ ValueMaterializerTy(TypeMapTy &TypeMap, Module *DstM,
+ std::vector<Function*> &LazilyLinkFunctions) :
+ ValueMaterializer(), TypeMap(TypeMap), DstM(DstM),
+ LazilyLinkFunctions(LazilyLinkFunctions) {
+ }
+
+ Value *materializeValueFor(Value *V) override;
+ };
+
/// ModuleLinker - This is an implementation class for the LinkModules
/// function, which is the entrypoint for this file.
class ModuleLinker {
Module *DstM, *SrcM;
TypeMapTy TypeMap;
+ ValueMaterializerTy ValMaterializer;
/// ValueMap - Mapping of values from what they used to be in Src, to what
/// they are now in DstM. ValueToValueMapTy is a ValueMap, which involves
// 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;
+
+ bool SuppressWarnings;
+
public:
std::string ErrorMsg;
-
- ModuleLinker(Module *dstM, Module *srcM, unsigned mode)
- : DstM(dstM), SrcM(srcM), Mode(mode) { }
-
+
+ ModuleLinker(Module *dstM, TypeSet &Set, Module *srcM, unsigned mode,
+ bool SuppressWarnings=false)
+ : DstM(dstM), SrcM(srcM), TypeMap(Set),
+ ValMaterializer(TypeMap, DstM, LazilyLinkFunctions), Mode(mode),
+ SuppressWarnings(SuppressWarnings) {}
+
bool run();
private:
/// getLinkageResult - This analyzes the two global values and determines
/// what the result will look like in the destination module.
bool getLinkageResult(GlobalValue *Dest, const GlobalValue *Src,
- GlobalValue::LinkageTypes <, bool &LinkFromSrc);
+ GlobalValue::LinkageTypes <,
+ GlobalValue::VisibilityTypes &Vis,
+ bool &LinkFromSrc);
/// getLinkedToGlobal - Given a global in the source module, return the
/// global in the destination module that is being linked to, if any.
bool linkGlobalProto(GlobalVariable *SrcGV);
bool linkFunctionProto(Function *SrcF);
bool linkAliasProto(GlobalAlias *SrcA);
+ bool linkModuleFlagsMetadata();
void linkAppendingVarInit(const AppendingVarInfo &AVI);
void linkGlobalInits();
};
}
-
-
/// forceRenaming - The LLVM SymbolTable class autorenames globals that conflict
/// in the symbol table. This is good for all clients except for us. Go
/// through the trouble to force this back.
}
}
-/// CopyGVAttributes - copy additional attributes (those not needed to construct
+/// copyGVAttributes - copy additional attributes (those not needed to construct
/// a GlobalValue) from the SrcGV to the DestGV.
-static void CopyGVAttributes(GlobalValue *DestGV, const GlobalValue *SrcGV) {
+static void copyGVAttributes(GlobalValue *DestGV, const GlobalValue *SrcGV) {
// Use the maximum alignment, rather than just copying the alignment of SrcGV.
unsigned Alignment = std::max(DestGV->getAlignment(), SrcGV->getAlignment());
DestGV->copyAttributesFrom(SrcGV);
forceRenaming(DestGV, SrcGV->getName());
}
+static bool isLessConstraining(GlobalValue::VisibilityTypes a,
+ GlobalValue::VisibilityTypes b) {
+ if (a == GlobalValue::HiddenVisibility)
+ return false;
+ if (b == GlobalValue::HiddenVisibility)
+ return true;
+ if (a == GlobalValue::ProtectedVisibility)
+ return false;
+ if (b == GlobalValue::ProtectedVisibility)
+ return true;
+ return false;
+}
+
+Value *ValueMaterializerTy::materializeValueFor(Value *V) {
+ Function *SF = dyn_cast<Function>(V);
+ if (!SF)
+ return NULL;
+
+ Function *DF = Function::Create(TypeMap.get(SF->getFunctionType()),
+ SF->getLinkage(), SF->getName(), DstM);
+ copyGVAttributes(DF, SF);
+
+ LazilyLinkFunctions.push_back(SF);
+ return DF;
+}
+
+
/// getLinkageResult - This analyzes the two global values and determines what
/// the result will look like in the destination module. In particular, it
-/// computes the resultant linkage type, computes whether the global in the
-/// source should be copied over to the destination (replacing the existing
-/// one), and computes whether this linkage is an error or not. It also performs
-/// visibility checks: we cannot link together two symbols with different
-/// visibilities.
+/// computes the resultant linkage type and visibility, computes whether the
+/// global in the source should be copied over to the destination (replacing
+/// the existing one), and computes whether this linkage is an error or not.
bool ModuleLinker::getLinkageResult(GlobalValue *Dest, const GlobalValue *Src,
- GlobalValue::LinkageTypes <,
+ GlobalValue::LinkageTypes <,
+ GlobalValue::VisibilityTypes &Vis,
bool &LinkFromSrc) {
assert(Dest && "Must have two globals being queried");
assert(!Src->hasLocalLinkage() &&
"If Src has internal linkage, Dest shouldn't be set!");
- bool SrcIsDeclaration = Src->isDeclaration();
+ bool SrcIsDeclaration = Src->isDeclaration() && !Src->isMaterializable();
bool DestIsDeclaration = Dest->isDeclaration();
if (SrcIsDeclaration) {
// If Src is external or if both Src & Dest are external.. Just link the
// external globals, we aren't adding anything.
- if (Src->hasDLLImportLinkage()) {
- // If one of GVs has DLLImport linkage, result should be dllimport'ed.
+ if (Src->hasDLLImportStorageClass()) {
+ // If one of GVs is marked as DLLImport, result should be dllimport'ed.
if (DestIsDeclaration) {
LinkFromSrc = true;
LT = Src->getLinkage();
LinkFromSrc = false;
LT = Dest->getLinkage();
}
- } else if (DestIsDeclaration && !Dest->hasDLLImportLinkage()) {
+ } else if (DestIsDeclaration && !Dest->hasDLLImportStorageClass()) {
// If Dest is external but Src is not:
LinkFromSrc = true;
LT = Src->getLinkage();
LT = GlobalValue::ExternalLinkage;
}
} else {
- assert((Dest->hasExternalLinkage() || Dest->hasDLLImportLinkage() ||
- Dest->hasDLLExportLinkage() || Dest->hasExternalWeakLinkage()) &&
- (Src->hasExternalLinkage() || Src->hasDLLImportLinkage() ||
- Src->hasDLLExportLinkage() || Src->hasExternalWeakLinkage()) &&
+ assert((Dest->hasExternalLinkage() || Dest->hasExternalWeakLinkage()) &&
+ (Src->hasExternalLinkage() || Src->hasExternalWeakLinkage()) &&
"Unexpected linkage type!");
return emitError("Linking globals named '" + Src->getName() +
"': symbol multiply defined!");
}
- // Check visibility
- if (Src->getVisibility() != Dest->getVisibility() &&
- !SrcIsDeclaration && !DestIsDeclaration &&
- !Src->hasAvailableExternallyLinkage() &&
- !Dest->hasAvailableExternallyLinkage())
- return emitError("Linking globals named '" + Src->getName() +
- "': symbols have different visibilities!");
+ // Compute the visibility. We follow the rules in the System V Application
+ // Binary Interface.
+ Vis = isLessConstraining(Src->getVisibility(), Dest->getVisibility()) ?
+ Dest->getVisibility() : Src->getVisibility();
return false;
}
if (GlobalValue *DGV = getLinkedToGlobal(I))
TypeMap.addTypeMapping(DGV->getType(), I->getType());
}
-
+
+ // Incorporate types by name, scanning all the types in the source module.
+ // 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);
+ SmallPtrSet<StructType*, 32> SrcStructTypesSet(SrcStructTypes.begin(),
+ SrcStructTypes.end());
+
+ for (unsigned i = 0, e = SrcStructTypes.size(); i != e; ++i) {
+ StructType *ST = SrcStructTypes[i];
+ if (!ST->hasName()) continue;
+
+ // Check to see if there is a dot in the name followed by a digit.
+ size_t DotPos = ST->getName().rfind('.');
+ if (DotPos == 0 || DotPos == StringRef::npos ||
+ ST->getName().back() == '.' ||
+ !isdigit(static_cast<unsigned char>(ST->getName()[DotPos+1])))
+ continue;
+
+ // Check to see if the destination module has a struct with the prefix name.
+ if (StructType *DST = DstM->getTypeByName(ST->getName().substr(0, DotPos)))
+ // Don't use it if this actually came from the source module. They're in
+ // the same LLVMContext after all. Also don't use it unless the type is
+ // actually used in the destination module. This can happen in situations
+ // like this:
+ //
+ // Module A Module B
+ // -------- --------
+ // %Z = type { %A } %B = type { %C.1 }
+ // %A = type { %B.1, [7 x i8] } %C.1 = type { i8* }
+ // %B.1 = type { %C } %A.2 = type { %B.3, [5 x i8] }
+ // %C = type { i8* } %B.3 = type { %C.1 }
+ //
+ // When we link Module B with Module A, the '%B' in Module B is
+ // used. However, that would then use '%C.1'. But when we process '%C.1',
+ // 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 (!SrcStructTypesSet.count(DST) && TypeMap.DstStructTypesSet.count(DST))
+ TypeMap.addTypeMapping(DST, ST);
+ }
+
// Don't bother incorporating aliases, they aren't generally typed well.
// Now that we have discovered all of the type equivalences, get a body for
if (DstGV->getVisibility() != SrcGV->getVisibility())
return emitError(
"Appending variables with different visibility need to be linked!");
-
+
+ if (DstGV->hasUnnamedAddr() != SrcGV->hasUnnamedAddr())
+ return emitError(
+ "Appending variables with different unnamed_addr need to be linked!");
+
if (DstGV->getSection() != SrcGV->getSection())
return emitError(
"Appending variables with different section name need to be linked!");
GlobalVariable *NG =
new GlobalVariable(*DstGV->getParent(), NewType, SrcGV->isConstant(),
DstGV->getLinkage(), /*init*/0, /*name*/"", DstGV,
- DstGV->isThreadLocal(),
+ DstGV->getThreadLocalMode(),
DstGV->getType()->getAddressSpace());
// Propagate alignment, visibility and section info.
- CopyGVAttributes(NG, DstGV);
+ copyGVAttributes(NG, DstGV);
AppendingVarInfo AVI;
AVI.NewGV = NG;
/// merge them into the dest module.
bool ModuleLinker::linkGlobalProto(GlobalVariable *SGV) {
GlobalValue *DGV = getLinkedToGlobal(SGV);
+ llvm::Optional<GlobalValue::VisibilityTypes> NewVisibility;
+ bool HasUnnamedAddr = SGV->hasUnnamedAddr();
if (DGV) {
// Concatenation of appending linkage variables is magic and handled later.
// Determine whether linkage of these two globals follows the source
// module's definition or the destination module's definition.
GlobalValue::LinkageTypes NewLinkage = GlobalValue::InternalLinkage;
+ GlobalValue::VisibilityTypes NV;
bool LinkFromSrc = false;
- if (getLinkageResult(DGV, SGV, NewLinkage, LinkFromSrc))
+ if (getLinkageResult(DGV, SGV, NewLinkage, NV, LinkFromSrc))
return true;
+ NewVisibility = NV;
+ HasUnnamedAddr = HasUnnamedAddr && DGV->hasUnnamedAddr();
// If we're not linking from the source, then keep the definition that we
// have.
if (GlobalVariable *DGVar = dyn_cast<GlobalVariable>(DGV))
if (DGVar->isDeclaration() && SGV->isConstant() && !DGVar->isConstant())
DGVar->setConstant(true);
-
- // Set calculated linkage.
+
+ // Set calculated linkage, visibility and unnamed_addr.
DGV->setLinkage(NewLinkage);
-
+ DGV->setVisibility(*NewVisibility);
+ DGV->setUnnamedAddr(HasUnnamedAddr);
+
// Make sure to remember this mapping.
ValueMap[SGV] = ConstantExpr::getBitCast(DGV,TypeMap.get(SGV->getType()));
new GlobalVariable(*DstM, TypeMap.get(SGV->getType()->getElementType()),
SGV->isConstant(), SGV->getLinkage(), /*init*/0,
SGV->getName(), /*insertbefore*/0,
- SGV->isThreadLocal(),
+ SGV->getThreadLocalMode(),
SGV->getType()->getAddressSpace());
// Propagate alignment, visibility and section info.
- CopyGVAttributes(NewDGV, SGV);
+ copyGVAttributes(NewDGV, SGV);
+ if (NewVisibility)
+ NewDGV->setVisibility(*NewVisibility);
+ NewDGV->setUnnamedAddr(HasUnnamedAddr);
if (DGV) {
DGV->replaceAllUsesWith(ConstantExpr::getBitCast(NewDGV, DGV->getType()));
/// destination module if needed, setting up mapping information.
bool ModuleLinker::linkFunctionProto(Function *SF) {
GlobalValue *DGV = getLinkedToGlobal(SF);
+ llvm::Optional<GlobalValue::VisibilityTypes> NewVisibility;
+ bool HasUnnamedAddr = SF->hasUnnamedAddr();
if (DGV) {
GlobalValue::LinkageTypes NewLinkage = GlobalValue::InternalLinkage;
bool LinkFromSrc = false;
- if (getLinkageResult(DGV, SF, NewLinkage, LinkFromSrc))
+ GlobalValue::VisibilityTypes NV;
+ if (getLinkageResult(DGV, SF, NewLinkage, NV, LinkFromSrc))
return true;
-
+ NewVisibility = NV;
+ HasUnnamedAddr = HasUnnamedAddr && DGV->hasUnnamedAddr();
+
if (!LinkFromSrc) {
// Set calculated linkage
DGV->setLinkage(NewLinkage);
-
+ DGV->setVisibility(*NewVisibility);
+ DGV->setUnnamedAddr(HasUnnamedAddr);
+
// Make sure to remember this mapping.
ValueMap[SF] = ConstantExpr::getBitCast(DGV, TypeMap.get(SF->getType()));
}
}
+ // 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 false;
+ }
+
// If there is no linkage to be performed or we are linking from the source,
// bring SF over.
Function *NewDF = Function::Create(TypeMap.get(SF->getFunctionType()),
SF->getLinkage(), SF->getName(), DstM);
- CopyGVAttributes(NewDF, SF);
+ copyGVAttributes(NewDF, SF);
+ if (NewVisibility)
+ NewDF->setVisibility(*NewVisibility);
+ NewDF->setUnnamedAddr(HasUnnamedAddr);
if (DGV) {
// Any uses of DF need to change to NewDF, with cast.
/// source module.
bool ModuleLinker::linkAliasProto(GlobalAlias *SGA) {
GlobalValue *DGV = getLinkedToGlobal(SGA);
-
+ llvm::Optional<GlobalValue::VisibilityTypes> NewVisibility;
+
if (DGV) {
GlobalValue::LinkageTypes NewLinkage = GlobalValue::InternalLinkage;
+ GlobalValue::VisibilityTypes NV;
bool LinkFromSrc = false;
- if (getLinkageResult(DGV, SGA, NewLinkage, LinkFromSrc))
+ if (getLinkageResult(DGV, SGA, NewLinkage, NV, LinkFromSrc))
return true;
-
+ NewVisibility = NV;
+
if (!LinkFromSrc) {
// Set calculated linkage.
DGV->setLinkage(NewLinkage);
-
+ DGV->setVisibility(*NewVisibility);
+
// Make sure to remember this mapping.
ValueMap[SGA] = ConstantExpr::getBitCast(DGV,TypeMap.get(SGA->getType()));
GlobalAlias *NewDA = new GlobalAlias(TypeMap.get(SGA->getType()),
SGA->getLinkage(), SGA->getName(),
/*aliasee*/0, DstM);
- CopyGVAttributes(NewDA, SGA);
+ copyGVAttributes(NewDA, SGA);
+ if (NewVisibility)
+ NewDA->setVisibility(*NewVisibility);
if (DGV) {
// Any uses of DGV need to change to NewDA, with cast.
return false;
}
+static void getArrayElements(Constant *C, SmallVectorImpl<Constant*> &Dest) {
+ unsigned NumElements = cast<ArrayType>(C->getType())->getNumElements();
+
+ for (unsigned i = 0; i != NumElements; ++i)
+ Dest.push_back(C->getAggregateElement(i));
+}
+
void ModuleLinker::linkAppendingVarInit(const AppendingVarInfo &AVI) {
// Merge the initializer.
SmallVector<Constant*, 16> Elements;
- if (ConstantArray *I = dyn_cast<ConstantArray>(AVI.DstInit)) {
- for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i)
- Elements.push_back(I->getOperand(i));
- } else {
- assert(isa<ConstantAggregateZero>(AVI.DstInit));
- ArrayType *DstAT = cast<ArrayType>(AVI.DstInit->getType());
- Type *EltTy = DstAT->getElementType();
- Elements.append(DstAT->getNumElements(), Constant::getNullValue(EltTy));
- }
+ getArrayElements(AVI.DstInit, Elements);
+
+ Constant *SrcInit = MapValue(AVI.SrcInit, ValueMap, RF_None, &TypeMap, &ValMaterializer);
+ getArrayElements(SrcInit, Elements);
- Constant *SrcInit = MapValue(AVI.SrcInit, ValueMap, RF_None, &TypeMap);
- if (const ConstantArray *I = dyn_cast<ConstantArray>(SrcInit)) {
- for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i)
- Elements.push_back(I->getOperand(i));
- } else {
- assert(isa<ConstantAggregateZero>(SrcInit));
- ArrayType *SrcAT = cast<ArrayType>(SrcInit->getType());
- Type *EltTy = SrcAT->getElementType();
- Elements.append(SrcAT->getNumElements(), Constant::getNullValue(EltTy));
- }
ArrayType *NewType = cast<ArrayType>(AVI.NewGV->getType()->getElementType());
AVI.NewGV->setInitializer(ConstantArray::get(NewType, Elements));
}
-
-// linkGlobalInits - Update the initializers in the Dest module now that all
-// globals that may be referenced are in Dest.
+/// linkGlobalInits - 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(),
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));
+ RF_None, &TypeMap, &ValMaterializer));
}
}
-// linkFunctionBody - 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.
+/// linkFunctionBody - 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());
// 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);
+ RemapInstruction(I, ValueMap, RF_IgnoreMissingEntries,
+ &TypeMap, &ValMaterializer);
} else {
// Clone the body of the function into the dest function.
SmallVector<ReturnInst*, 8> Returns; // Ignore returns.
- CloneFunctionInto(Dst, Src, ValueMap, false, Returns);
+ CloneFunctionInto(Dst, Src, ValueMap, false, Returns, "", NULL,
+ &TypeMap, &ValMaterializer);
}
// There is no need to map the arguments anymore.
}
-
+/// linkAliasBodies - 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) {
continue;
if (Constant *Aliasee = I->getAliasee()) {
GlobalAlias *DA = cast<GlobalAlias>(ValueMap[I]);
- DA->setAliasee(MapValue(Aliasee, ValueMap, RF_None, &TypeMap));
+ DA->setAliasee(MapValue(Aliasee, ValueMap, RF_None,
+ &TypeMap, &ValMaterializer));
}
}
}
-/// linkNamedMDNodes - Insert all of the named mdnodes in Src into the Dest
+/// linkNamedMDNodes - 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) {
+ // Don't link module flags here. Do them separately.
+ if (&*I == SrcModFlags) continue;
NamedMDNode *DestNMD = DstM->getOrInsertNamedMetadata(I->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));
+ RF_None, &TypeMap, &ValMaterializer));
+ }
+}
+
+/// linkModuleFlagsMetadata - Merge the linker flags in Src into the Dest
+/// module.
+bool ModuleLinker::linkModuleFlagsMetadata() {
+ // If the source module has no module flags, we are done.
+ const NamedMDNode *SrcModFlags = SrcM->getModuleFlagsMetadata();
+ if (!SrcModFlags) return false;
+
+ // If the destination module doesn't have module flags yet, then just copy
+ // over the source module's flags.
+ NamedMDNode *DstModFlags = DstM->getOrInsertModuleFlagsMetadata();
+ if (DstModFlags->getNumOperands() == 0) {
+ for (unsigned I = 0, E = SrcModFlags->getNumOperands(); I != E; ++I)
+ DstModFlags->addOperand(SrcModFlags->getOperand(I));
+
+ return false;
}
+
+ // First build a map of the existing module flags and requirements.
+ DenseMap<MDString*, MDNode*> 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));
+ MDString *ID = cast<MDString>(Op->getOperand(1));
+
+ if (Behavior->getZExtValue() == Module::Require) {
+ Requirements.insert(cast<MDNode>(Op->getOperand(2)));
+ } else {
+ Flags[ID] = Op;
+ }
+ }
+
+ // Merge in the flags from the source module, and also collect its set of
+ // requirements.
+ 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));
+ MDString *ID = cast<MDString>(SrcOp->getOperand(1));
+ MDNode *DstOp = Flags.lookup(ID);
+ unsigned SrcBehaviorValue = SrcBehavior->getZExtValue();
+
+ // If this is a requirement, add it and continue.
+ if (SrcBehaviorValue == Module::Require) {
+ // If the destination module does not already have this requirement, add
+ // it.
+ if (Requirements.insert(cast<MDNode>(SrcOp->getOperand(2)))) {
+ DstModFlags->addOperand(SrcOp);
+ }
+ continue;
+ }
+
+ // If there is no existing flag with this ID, just add it.
+ if (!DstOp) {
+ Flags[ID] = SrcOp;
+ DstModFlags->addOperand(SrcOp);
+ continue;
+ }
+
+ // Otherwise, perform a merge.
+ ConstantInt *DstBehavior = cast<ConstantInt>(DstOp->getOperand(0));
+ unsigned DstBehaviorValue = DstBehavior->getZExtValue();
+
+ // If either flag has override behavior, handle it first.
+ if (DstBehaviorValue == Module::Override) {
+ // Diagnose inconsistent flags which both have override behavior.
+ if (SrcBehaviorValue == Module::Override &&
+ SrcOp->getOperand(2) != DstOp->getOperand(2)) {
+ HasErr |= emitError("linking module flags '" + ID->getString() +
+ "': IDs have conflicting override values");
+ }
+ 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));
+ continue;
+ }
+
+ // Diagnose inconsistent merge behavior types.
+ if (SrcBehaviorValue != DstBehaviorValue) {
+ HasErr |= emitError("linking module flags '" + ID->getString() +
+ "': IDs have conflicting behaviors");
+ continue;
+ }
+
+ // Perform the merge for standard behavior types.
+ switch (SrcBehaviorValue) {
+ case Module::Require:
+ case Module::Override: assert(0 && "not possible"); break;
+ case Module::Error: {
+ // Emit an error if the values differ.
+ if (SrcOp->getOperand(2) != DstOp->getOperand(2)) {
+ HasErr |= emitError("linking module flags '" + ID->getString() +
+ "': IDs have conflicting values");
+ }
+ continue;
+ }
+ case Module::Warning: {
+ // Emit a warning if the values differ.
+ if (SrcOp->getOperand(2) != DstOp->getOperand(2)) {
+ if (!SuppressWarnings) {
+ errs() << "WARNING: linking module flags '" << ID->getString()
+ << "': IDs have conflicting values";
+ }
+ }
+ continue;
+ }
+ 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;
+ break;
+ }
+ case Module::AppendUnique: {
+ SmallSetVector<Value*, 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())));
+ break;
+ }
+ }
+ }
+
+ // Check all of the requirements.
+ 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);
+
+ MDNode *Op = Flags[Flag];
+ if (!Op || Op->getOperand(2) != ReqValue) {
+ HasErr |= emitError("linking module flags '" + Flag->getString() +
+ "': does not have the required value");
+ continue;
+ }
+ }
+
+ return HasErr;
}
bool ModuleLinker::run() {
- assert(DstM && "Null Destination module");
- assert(SrcM && "Null Source Module");
+ 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().empty() && !SrcM->getDataLayout().empty())
+ if (!DstM->getDataLayout() && SrcM->getDataLayout())
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().empty() && !DstM->getDataLayout().empty() &&
- SrcM->getDataLayout() != DstM->getDataLayout())
- errs() << "WARNING: Linking two modules of different data layouts!\n";
+ if (SrcM->getDataLayout() && DstM->getDataLayout() &&
+ *SrcM->getDataLayout() != *DstM->getDataLayout()) {
+ if (!SuppressWarnings) {
+ errs() << "WARNING: 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()) {
- errs() << "WARNING: Linking two modules of different target triples: ";
- if (!SrcM->getModuleIdentifier().empty())
- errs() << SrcM->getModuleIdentifier() << ": ";
- errs() << "'" << SrcM->getTargetTriple() << "' and '"
- << DstM->getTargetTriple() << "'\n";
+ if (!SuppressWarnings) {
+ errs() << "WARNING: Linking two modules of different target triples: "
+ << SrcM->getModuleIdentifier() << "' is '"
+ << SrcM->getTargetTriple() << "' whereas '"
+ << DstM->getModuleIdentifier() << "' is '"
+ << DstM->getTargetTriple() << "'\n";
+ }
}
// Append the module inline asm string.
SrcM->getModuleInlineAsm());
}
- // Update the destination module's dependent libraries list with the libraries
- // from the source module. There's no opportunity for duplicates here as the
- // Module ensures that duplicate insertions are discarded.
- for (Module::lib_iterator SI = SrcM->lib_begin(), SE = SrcM->lib_end();
- SI != SE; ++SI)
- DstM->addLibrary(*SI);
-
- // If the source library's module id is in the dependent library list of the
- // destination library, remove it since that module is now linked in.
- StringRef ModuleId = SrcM->getModuleIdentifier();
- if (!ModuleId.empty())
- DstM->removeLibrary(sys::path::stem(ModuleId));
-
// Loop over all of the linked values to compute type mappings.
computeTypeMapping();
for (unsigned i = 0, e = AppendingVars.size(); i != e; ++i)
linkAppendingVarInit(AppendingVars[i]);
- // Update the initializers in the DstM module now that all globals that may
- // be referenced are in DstM.
- linkGlobalInits();
-
// 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) {
-
// Skip if not linking from source.
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));
+ }
+
// Skip if no body (function is external) or materialize.
if (SF->isDeclaration()) {
if (!SF->isMaterializable())
return true;
}
- linkFunctionBody(cast<Function>(ValueMap[SF]), SF);
+ linkFunctionBody(DF, SF);
+ SF->Dematerialize();
}
// Resolve all uses of aliases with aliasees.
linkAliasBodies();
- // Remap all of the named mdnoes in Src into the DstM module. We do this
+ // 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.
linkNamedMDNodes();
+ // Merge the module flags into the DstM module.
+ if (linkModuleFlagsMetadata())
+ return true;
+
+ // Update the initializers in the DstM module now that all globals that may
+ // be referenced are in DstM.
+ linkGlobalInits();
+
+ // 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;
+
+ Function *DF = cast<Function>(ValueMap[SF]);
+ if (SF->hasPrefixData()) {
+ // Link in the prefix data.
+ DF->setPrefixData(MapValue(SF->getPrefixData(),
+ ValueMap,
+ RF_None,
+ &TypeMap,
+ &ValMaterializer));
+ }
+
+ // Materialize if necessary.
+ if (SF->isDeclaration()) {
+ if (!SF->isMaterializable())
+ continue;
+ if (SF->Materialize(&ErrorMsg))
+ return true;
+ }
+
+ // Erase from vector *before* the function body is linked - linkFunctionBody could
+ // invalidate I.
+ LazilyLinkFunctions.erase(I);
+
+ // Link in function body.
+ linkFunctionBody(DF, SF);
+ SF->Dematerialize();
+
+ // Set flag to indicate we may have more functions to lazily link in
+ // since we linked in a function.
+ LinkedInAnyFunctions = true;
+ break;
+ }
+ } while (LinkedInAnyFunctions);
+
// Now that all of the types from the source are used, resolve any structs
// copied over to the dest that didn't exist there.
TypeMap.linkDefinedTypeBodies();
return false;
}
+Linker::Linker(Module *M, bool SuppressWarnings)
+ : Composite(M), SuppressWarnings(SuppressWarnings) {
+ TypeFinder StructTypes;
+ StructTypes.run(*M, true);
+ IdentifiedStructTypes.insert(StructTypes.begin(), StructTypes.end());
+}
+
+Linker::~Linker() {
+}
+
+void Linker::deleteModule() {
+ delete Composite;
+ Composite = NULL;
+}
+
+bool Linker::linkInModule(Module *Src, unsigned Mode, std::string *ErrorMsg) {
+ ModuleLinker TheLinker(Composite, IdentifiedStructTypes, Src, Mode,
+ SuppressWarnings);
+ if (TheLinker.run()) {
+ if (ErrorMsg)
+ *ErrorMsg = TheLinker.ErrorMsg;
+ return true;
+ }
+ return false;
+}
+
//===----------------------------------------------------------------------===//
// LinkModules entrypoint.
//===----------------------------------------------------------------------===//
-// LinkModules - This function links two modules together, with the resulting
-// left module modified to be the composite of the two input modules. If an
-// error occurs, true is returned and ErrorMsg (if not null) is set to indicate
-// the problem. Upon failure, the Dest module could be in a modified state, and
-// shouldn't be relied on to be consistent.
+/// LinkModules - This function links two modules together, with the resulting
+/// Dest module modified to be the composite of the two input modules. If an
+/// error occurs, true is returned and ErrorMsg (if not null) is set to indicate
+/// the problem. 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, unsigned Mode,
std::string *ErrorMsg) {
- ModuleLinker TheLinker(Dest, Src, Mode);
- if (TheLinker.run()) {
- if (ErrorMsg) *ErrorMsg = TheLinker.ErrorMsg;
- return true;
- }
-
- return false;
+ Linker L(Dest);
+ return L.linkInModule(Src, Mode, ErrorMsg);
+}
+
+//===----------------------------------------------------------------------===//
+// C API.
+//===----------------------------------------------------------------------===//
+
+LLVMBool LLVMLinkModules(LLVMModuleRef Dest, LLVMModuleRef Src,
+ LLVMLinkerMode Mode, char **OutMessages) {
+ std::string Messages;
+ LLVMBool Result = Linker::LinkModules(unwrap(Dest), unwrap(Src),
+ Mode, OutMessages? &Messages : 0);
+ if (OutMessages)
+ *OutMessages = strdup(Messages.c_str());
+ return Result;
}
projects / oota-llvm.git / blobdiff