std::vector<AppendingVarInfo> AppendingVars;
// Set of items not to link in from source.
- SmallPtrSet<const Value *, 16> DoNotLinkFromSource;
+ SmallPtrSet<const GlobalValue *, 16> DoNotLinkFromSource;
DiagnosticHandlerFunction DiagnosticHandler;
/// references.
bool DoneLinkingBodies;
+ bool HasError = false;
+
public:
ModuleLinker(Module *dstM, Linker::IdentifiedStructTypeSet &Set, Module *srcM,
DiagnosticHandlerFunction DiagnosticHandler, unsigned Flags,
/// Helper method for setting a message and returning an error code.
bool emitError(const Twine &Message) {
DiagnosticHandler(LinkDiagnosticInfo(DS_Error, Message));
+ HasError = true;
return true;
}
void upgradeMismatchedGlobalArray(StringRef Name);
void upgradeMismatchedGlobals();
+ bool linkIfNeeded(GlobalValue &GV);
bool linkAppendingVarProto(GlobalVariable *DstGV,
const GlobalVariable *SrcGV);
bool linkGlobalValueProto(GlobalValue *GV);
bool linkModuleFlagsMetadata();
- void linkAppendingVarInit(const AppendingVarInfo &AVI);
+ void linkAppendingVarInit(AppendingVarInfo &AVI);
void linkGlobalInit(GlobalVariable &Dst, GlobalVariable &Src);
bool linkFunctionBody(Function &Dst, Function &Src);
forceRenaming(NewGV, getName(SrcGV));
}
-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;
-}
-
bool ModuleLinker::doImportAsDefinition(const GlobalValue *SGV) {
if (!isPerformingImport())
return false;
getLinkage(SGA), getName(SGA), DstM);
}
+static GlobalValue::VisibilityTypes
+getMinVisibility(GlobalValue::VisibilityTypes A,
+ GlobalValue::VisibilityTypes B) {
+ if (A == GlobalValue::HiddenVisibility || B == GlobalValue::HiddenVisibility)
+ return GlobalValue::HiddenVisibility;
+ if (A == GlobalValue::ProtectedVisibility ||
+ B == GlobalValue::ProtectedVisibility)
+ return GlobalValue::ProtectedVisibility;
+ return GlobalValue::DefaultVisibility;
+}
+
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;
+ Visibility = getMinVisibility(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))
if (doneLinkingBodies())
return nullptr;
- GlobalValue *DGV = copyGlobalValueProto(TypeMap, SGV);
-
- if (Comdat *SC = SGV->getComdat()) {
- if (auto *DGO = dyn_cast<GlobalObject>(DGV)) {
- Comdat *DC = DstM->getOrInsertComdat(SC->getName());
- DGO->setComdat(DC);
- }
- }
-
- return DGV;
+ linkGlobalValueProto(SGV);
+ if (HasError)
+ return nullptr;
+ Value *Ret = ValueMap[SGV];
+ assert(Ret);
+ return Ret;
}
void ValueMaterializerTy::materializeInitFor(GlobalValue *New,
}
void ModuleLinker::materializeInitFor(GlobalValue *New, GlobalValue *Old) {
+ if (auto *F = dyn_cast<Function>(New)) {
+ if (!F->isDeclaration())
+ return;
+ } else if (auto *V = dyn_cast<GlobalVariable>(New)) {
+ if (V->hasInitializer())
+ return;
+ } else {
+ auto *A = cast<GlobalAlias>(New);
+ if (A->getAliasee())
+ return;
+ }
+
+ if (Old->isDeclaration())
+ return;
+
if (isPerformingImport() && !doImportAsDefinition(Old))
return;
- // Skip declarations that ValueMaterializer may have created in
- // case we link in only some of SrcM.
- if (shouldLinkOnlyNeeded() && Old->isDeclaration())
+ if (DoNotLinkFromSource.count(Old))
return;
- assert(!Old->isDeclaration() && "users should not pass down decls");
linkGlobalValueBody(*Old);
}
/// Return true on error.
bool ModuleLinker::linkAppendingVarProto(GlobalVariable *DstGV,
const GlobalVariable *SrcGV) {
-
- if (!SrcGV->hasAppendingLinkage() || !DstGV->hasAppendingLinkage())
- return emitError("Linking globals named '" + SrcGV->getName() +
- "': can only link appending global with another appending global!");
-
- ArrayType *DstTy = cast<ArrayType>(DstGV->getType()->getElementType());
ArrayType *SrcTy =
- cast<ArrayType>(TypeMap.get(SrcGV->getType()->getElementType()));
- Type *EltTy = DstTy->getElementType();
-
- // Check to see that they two arrays agree on type.
- if (EltTy != SrcTy->getElementType())
- return emitError("Appending variables with different element types!");
- if (DstGV->isConstant() != SrcGV->isConstant())
- return emitError("Appending variables linked with different const'ness!");
-
- if (DstGV->getAlignment() != SrcGV->getAlignment())
- return emitError(
- "Appending variables with different alignment need to be linked!");
-
- 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 (StringRef(DstGV->getSection()) != SrcGV->getSection())
- return emitError(
+ cast<ArrayType>(TypeMap.get(SrcGV->getType()->getElementType()));
+ Type *EltTy = SrcTy->getElementType();
+
+ uint64_t NewSize = SrcTy->getNumElements();
+ if (DstGV) {
+ ArrayType *DstTy = cast<ArrayType>(DstGV->getType()->getElementType());
+ NewSize += DstTy->getNumElements();
+
+ if (!SrcGV->hasAppendingLinkage() || !DstGV->hasAppendingLinkage())
+ return emitError(
+ "Linking globals named '" + SrcGV->getName() +
+ "': can only link appending global with another appending global!");
+
+ // Check to see that they two arrays agree on type.
+ if (EltTy != DstTy->getElementType())
+ return emitError("Appending variables with different element types!");
+ if (DstGV->isConstant() != SrcGV->isConstant())
+ return emitError("Appending variables linked with different const'ness!");
+
+ if (DstGV->getAlignment() != SrcGV->getAlignment())
+ return emitError(
+ "Appending variables with different alignment need to be linked!");
+
+ 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 (StringRef(DstGV->getSection()) != SrcGV->getSection())
+ return emitError(
"Appending variables with different section name need to be linked!");
+ }
- uint64_t NewSize = DstTy->getNumElements() + SrcTy->getNumElements();
ArrayType *NewType = ArrayType::get(EltTy, NewSize);
// Create the new global variable.
- GlobalVariable *NG =
- new GlobalVariable(*DstGV->getParent(), NewType, SrcGV->isConstant(),
- DstGV->getLinkage(), /*init*/nullptr, /*name*/"", DstGV,
- DstGV->getThreadLocalMode(),
- DstGV->getType()->getAddressSpace());
+ GlobalVariable *NG = new GlobalVariable(
+ *DstM, NewType, SrcGV->isConstant(), SrcGV->getLinkage(),
+ /*init*/ nullptr, /*name*/ "", DstGV, SrcGV->getThreadLocalMode(),
+ SrcGV->getType()->getAddressSpace());
// Propagate alignment, visibility and section info.
- copyGVAttributes(NG, DstGV);
+ copyGVAttributes(NG, SrcGV);
AppendingVarInfo AVI;
AVI.NewGV = NG;
- AVI.DstInit = DstGV->getInitializer();
+ AVI.DstInit = DstGV ? DstGV->getInitializer() : nullptr;
AVI.SrcInit = SrcGV->getInitializer();
AppendingVars.push_back(AVI);
// global.
ValueMap[SrcGV] = ConstantExpr::getBitCast(NG, TypeMap.get(SrcGV->getType()));
- DstGV->replaceAllUsesWith(ConstantExpr::getBitCast(NG, DstGV->getType()));
- DstGV->eraseFromParent();
+ if (DstGV) {
+ DstGV->replaceAllUsesWith(ConstantExpr::getBitCast(NG, DstGV->getType()));
+ DstGV->eraseFromParent();
+ }
// Track the source variable so we don't try to link it.
DoNotLinkFromSource.insert(SrcGV);
DoNotLinkFromSource.insert(SGV);
return false;
}
- if (DGV && DGV->hasAppendingLinkage())
- return linkAppendingVarProto(cast<GlobalVariable>(DGV),
+ if (SGV->hasAppendingLinkage())
+ return linkAppendingVarProto(cast_or_null<GlobalVariable>(DGV),
cast<GlobalVariable>(SGV));
bool LinkFromSrc = true;
std::tie(SK, LinkFromSrc) = ComdatsChosen[SC];
C = DstM->getOrInsertComdat(SC->getName());
C->setSelectionKind(SK);
- ComdatMembers[SC].push_back(SGV);
} else if (DGV) {
if (shouldLinkFromSource(LinkFromSrc, *DGV, *SGV))
return true;
if (DGV)
HasUnnamedAddr = HasUnnamedAddr && DGV->hasUnnamedAddr();
- if (!LinkFromSrc && !DGV)
- return false;
-
GlobalValue *NewGV;
- if (!LinkFromSrc) {
+ if (!LinkFromSrc && DGV) {
NewGV = DGV;
// When linking from source we setVisibility from copyGlobalValueProto.
setVisibility(NewGV, SGV, DGV);
} else {
- // If the GV is to be lazily linked, don't create it just yet.
- // The ValueMaterializerTy will deal with creating it if it's used.
- if (!DGV && !shouldOverrideFromSrc() && SGV != ImportFunction &&
- (SGV->hasLocalLinkage() || SGV->hasLinkOnceLinkage() ||
- SGV->hasAvailableExternallyLinkage())) {
- DoNotLinkFromSource.insert(SGV);
- return false;
- }
-
- // 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;
- }
-
NewGV = copyGlobalValueProto(TypeMap, SGV, DGV);
if (isPerformingImport() && !doImportAsDefinition(SGV))
NewGV->setUnnamedAddr(HasUnnamedAddr);
if (auto *NewGO = dyn_cast<GlobalObject>(NewGV)) {
- if (C)
+ if (C && LinkFromSrc)
NewGO->setComdat(C);
if (DGV && DGV->hasCommonLinkage() && SGV->hasCommonLinkage())
Dest.push_back(C->getAggregateElement(i));
}
-void ModuleLinker::linkAppendingVarInit(const AppendingVarInfo &AVI) {
+void ModuleLinker::linkAppendingVarInit(AppendingVarInfo &AVI) {
// Merge the initializer.
SmallVector<Constant *, 16> DstElements;
- getArrayElements(AVI.DstInit, DstElements);
+ if (AVI.DstInit)
+ getArrayElements(AVI.DstInit, DstElements);
SmallVector<Constant *, 16> SrcElements;
getArrayElements(AVI.SrcInit, SrcElements);
for (auto *V : SrcElements) {
if (IsNewStructor) {
- Constant *Key = V->getAggregateElement(2);
+ auto *Key =
+ dyn_cast<GlobalValue>(V->getAggregateElement(2)->stripPointerCasts());
if (DoNotLinkFromSource.count(Key))
continue;
}
DstElements.push_back(
MapValue(V, ValueMap, RF_MoveDistinctMDs, &TypeMap, &ValMaterializer));
}
- if (IsNewStructor) {
+ if (DstElements.size() != NewType->getNumElements()) {
NewType = ArrayType::get(NewType->getElementType(), DstElements.size());
- AVI.NewGV->mutateType(PointerType::get(NewType, 0));
+ GlobalVariable *Old = AVI.NewGV;
+ GlobalVariable *NG = new GlobalVariable(
+ *DstM, NewType, Old->isConstant(), Old->getLinkage(), /*init*/ nullptr,
+ /*name*/ "", Old, Old->getThreadLocalMode(),
+ Old->getType()->getAddressSpace());
+ copyGVAttributes(NG, Old);
+ AVI.NewGV->replaceAllUsesWith(
+ ConstantExpr::getBitCast(NG, AVI.NewGV->getType()));
+ AVI.NewGV->eraseFromParent();
+ AVI.NewGV = NG;
}
AVI.NewGV->setInitializer(ConstantArray::get(NewType, DstElements));
return DstTriple.str();
}
+bool ModuleLinker::linkIfNeeded(GlobalValue &GV) {
+ GlobalValue *DGV = getLinkedToGlobal(&GV);
+
+ if (shouldLinkOnlyNeeded() && !(DGV && DGV->isDeclaration()))
+ return false;
+
+ if (DGV && !GV.hasLocalLinkage()) {
+ GlobalValue::VisibilityTypes Visibility =
+ getMinVisibility(DGV->getVisibility(), GV.getVisibility());
+ DGV->setVisibility(Visibility);
+ GV.setVisibility(Visibility);
+ }
+
+ if (const Comdat *SC = GV.getComdat()) {
+ bool LinkFromSrc;
+ Comdat::SelectionKind SK;
+ std::tie(SK, LinkFromSrc) = ComdatsChosen[SC];
+ if (!LinkFromSrc) {
+ DoNotLinkFromSource.insert(&GV);
+ return false;
+ }
+ }
+
+ if (!DGV && !shouldOverrideFromSrc() &&
+ (GV.hasLocalLinkage() || GV.hasLinkOnceLinkage() ||
+ GV.hasAvailableExternallyLinkage())) {
+ return false;
+ }
+ MapValue(&GV, ValueMap, RF_MoveDistinctMDs, &TypeMap, &ValMaterializer);
+ return HasError;
+}
+
bool ModuleLinker::run() {
assert(DstM && "Null destination module");
assert(SrcM && "Null source module");
// Upgrade mismatched global arrays.
upgradeMismatchedGlobals();
+ for (GlobalVariable &GV : SrcM->globals())
+ if (const Comdat *SC = GV.getComdat())
+ ComdatMembers[SC].push_back(&GV);
+
+ for (Function &SF : *SrcM)
+ if (const Comdat *SC = SF.getComdat())
+ ComdatMembers[SC].push_back(&SF);
+
+ for (GlobalAlias &GA : SrcM->aliases())
+ if (const Comdat *SC = GA.getComdat())
+ ComdatMembers[SC].push_back(&GA);
+
// Insert all of the globals in src into the DstM module... without linking
// initializers (which could refer to functions not yet mapped over).
for (GlobalVariable &GV : SrcM->globals())
- if (linkGlobalValueProto(&GV))
+ if (linkIfNeeded(GV))
return true;
- // Link the functions together between the two modules, without doing function
- // bodies... this just adds external function prototypes to the DstM
- // 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 (Function &F :*SrcM)
- if (linkGlobalValueProto(&F))
+ for (Function &SF : *SrcM)
+ if (linkIfNeeded(SF))
return true;
- // If there were any aliases, link them now.
for (GlobalAlias &GA : SrcM->aliases())
- if (linkGlobalValueProto(&GA))
+ if (linkIfNeeded(GA))
return true;
- for (const AppendingVarInfo &AppendingVar : AppendingVars)
+ for (AppendingVarInfo &AppendingVar : AppendingVars)
linkAppendingVarInit(AppendingVar);
for (const auto &Entry : DstM->getComdatSymbolTable()) {
MapValue(GV, ValueMap, RF_MoveDistinctMDs, &TypeMap, &ValMaterializer);
}
- // Link in the function bodies that are defined in the source module into
- // DstM.
- 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 (linkGlobalValueBody(SF))
- return true;
- }
-
- // Resolve all uses of aliases with aliasees.
- for (GlobalAlias &Src : SrcM->aliases()) {
- if (DoNotLinkFromSource.count(&Src))
- continue;
- linkGlobalValueBody(Src);
- }
-
- // 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);
- }
-
// Note that we are done linking global value bodies. This prevents
// metadata linking from creating new references.
DoneLinkingBodies = true;
projects / oota-llvm.git / blobdiff