#include "llvm/Linker.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
+#include "llvm/LLVMContext.h"
#include "llvm/Module.h"
#include "llvm/TypeSymbolTable.h"
#include "llvm/ValueSymbolTable.h"
#include "llvm/Instructions.h"
#include "llvm/Assembly/Writer.h"
-#include "llvm/Support/Streams.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
#include "llvm/System/Path.h"
#include "llvm/ADT/DenseMap.h"
-#include <sstream>
using namespace llvm;
// Error - Simple wrapper function to conditionally assign to E and return true.
// This just makes error return conditions a little bit simpler...
-static inline bool Error(std::string *E, const std::string &Message) {
- if (E) *E = Message;
+static inline bool Error(std::string *E, const Twine &Message) {
+ if (E) *E = Message.str();
return true;
}
-// ToStr - Simple wrapper function to convert a type to a string.
-static std::string ToStr(const Type *Ty, const Module *M) {
- std::ostringstream OS;
- WriteTypeSymbolic(OS, Ty, M);
- return OS.str();
-}
-
-//
// Function: ResolveTypes()
//
// Description:
class LinkerTypeMap : public AbstractTypeUser {
typedef DenseMap<const Type*, PATypeHolder> TheMapTy;
TheMapTy TheMap;
-
+
LinkerTypeMap(const LinkerTypeMap&); // DO NOT IMPLEMENT
void operator=(const LinkerTypeMap&); // DO NOT IMPLEMENT
public:
E = TheMap.end(); I != E; ++I)
I->first->removeAbstractTypeUser(this);
}
-
+
/// lookup - Return the value for the specified type or null if it doesn't
/// exist.
const Type *lookup(const Type *Ty) const {
if (I != TheMap.end()) return I->second;
return 0;
}
-
+
/// erase - Remove the specified type, returning true if it was in the set.
bool erase(const Type *Ty) {
if (!TheMap.erase(Ty))
Ty->removeAbstractTypeUser(this);
return true;
}
-
+
/// insert - This returns true if the pointer was new to the set, false if it
/// was already in the set.
bool insert(const Type *Src, const Type *Dst) {
Src->addAbstractTypeUser(this);
return true;
}
-
+
protected:
/// refineAbstractType - The callback method invoked when an abstract type is
/// resolved to another type. An object must override this method to update
const Type *NewTy) {
TheMapTy::iterator I = TheMap.find(OldTy);
const Type *DstTy = I->second;
-
+
TheMap.erase(I);
if (OldTy->isAbstract())
OldTy->removeAbstractTypeUser(this);
if (NewTy->isAbstract())
insert(NewTy, DstTy);
}
-
+
/// The other case which AbstractTypeUsers must be aware of is when a type
/// makes the transition from being abstract (where it has clients on it's
/// AbstractTypeUsers list) to concrete (where it does not). This method
TheMap.erase(AbsTy);
AbsTy->removeAbstractTypeUser(this);
}
-
+
// for debugging...
virtual void dump() const {
- cerr << "AbstractTypeSet!\n";
+ dbgs() << "AbstractTypeSet!\n";
}
};
}
if (DstTy == SrcTy) return false; // If already equal, noop
// If we found our opaque type, resolve it now!
- if (isa<OpaqueType>(DstTy) || isa<OpaqueType>(SrcTy))
+ if (DstTy->isOpaqueTy() || SrcTy->isOpaqueTy())
return ResolveTypes(DstTy, SrcTy);
// Two types cannot be resolved together if they are of different primitive
// If neither type is abstract, then they really are just different types.
if (!DstTy->isAbstract() && !SrcTy->isAbstract())
return true;
-
+
// Otherwise, resolve the used type used by this derived type...
switch (DstTy->getTypeID()) {
default:
if (DstFT->isVarArg() != SrcFT->isVarArg() ||
DstFT->getNumContainedTypes() != SrcFT->getNumContainedTypes())
return true;
-
+
// Use TypeHolder's so recursive resolution won't break us.
PATypeHolder ST(SrcFT), DT(DstFT);
for (unsigned i = 0, e = DstFT->getNumContainedTypes(); i != e; ++i) {
const StructType *SrcST = cast<StructType>(SrcTy);
if (DstST->getNumContainedTypes() != SrcST->getNumContainedTypes())
return true;
-
+
PATypeHolder ST(SrcST), DT(DstST);
for (unsigned i = 0, e = DstST->getNumContainedTypes(); i != e; ++i) {
const Type *SE = ST->getContainedType(i), *DE = DT->getContainedType(i);
case Type::PointerTyID: {
const PointerType *DstPT = cast<PointerType>(DstTy);
const PointerType *SrcPT = cast<PointerType>(SrcTy);
-
+
if (DstPT->getAddressSpace() != SrcPT->getAddressSpace())
return true;
-
+
// If this is a pointer type, check to see if we have already seen it. If
// so, we are in a recursive branch. Cut off the search now. We cannot use
// an associative container for this search, because the type pointers (keys
if (SrcPT->isAbstract())
if (const Type *ExistingDestTy = Pointers.lookup(SrcPT))
return ExistingDestTy != DstPT;
-
+
if (DstPT->isAbstract())
if (const Type *ExistingSrcTy = Pointers.lookup(DstPT))
return ExistingSrcTy != SrcPT;
Pointers.insert(DstPT, SrcPT);
if (SrcPT->isAbstract())
Pointers.insert(SrcPT, DstPT);
-
+
return RecursiveResolveTypesI(DstPT->getElementType(),
SrcPT->getElementType(), Pointers);
}
return false;
}
+#ifndef NDEBUG
static void PrintMap(const std::map<const Value*, Value*> &M) {
for (std::map<const Value*, Value*>::const_iterator I = M.begin(), E =M.end();
I != E; ++I) {
- cerr << " Fr: " << (void*)I->first << " ";
+ dbgs() << " Fr: " << (void*)I->first << " ";
I->first->dump();
- cerr << " To: " << (void*)I->second << " ";
+ dbgs() << " To: " << (void*)I->second << " ";
I->second->dump();
- cerr << "\n";
+ dbgs() << "\n";
}
}
+#endif
// RemapOperand - Use ValueMap to convert constants from one module to another.
static Value *RemapOperand(const Value *In,
std::map<const Value*, Value*> &ValueMap) {
std::map<const Value*,Value*>::const_iterator I = ValueMap.find(In);
- if (I != ValueMap.end())
+ if (I != ValueMap.end())
return I->second;
// Check to see if it's a constant that we are interested in transforming.
for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i)
Ops.push_back(cast<Constant>(RemapOperand(CE->getOperand(i),ValueMap)));
Result = CE->getWithOperands(Ops);
- } else if (isa<GlobalValue>(CPV)) {
- assert(0 && "Unmapped global?");
+ } else if (const BlockAddress *CE = dyn_cast<BlockAddress>(CPV)) {
+ Result = BlockAddress::get(
+ cast<Function>(RemapOperand(CE->getFunction(), ValueMap)),
+ CE->getBasicBlock());
+ } else {
+ assert(!isa<GlobalValue>(CPV) && "Unmapped global?");
+ llvm_unreachable("Unknown type of derived type constant value!");
+ }
+ } else if (const MDNode *MD = dyn_cast<MDNode>(In)) {
+ if (MD->isFunctionLocal()) {
+ SmallVector<Value*, 4> Elts;
+ for (unsigned i = 0, e = MD->getNumOperands(); i != e; ++i) {
+ if (MD->getOperand(i))
+ Elts.push_back(RemapOperand(MD->getOperand(i), ValueMap));
+ else
+ Elts.push_back(NULL);
+ }
+ Result = MDNode::get(In->getContext(), Elts.data(), MD->getNumOperands());
} else {
- assert(0 && "Unknown type of derived type constant value!");
+ Result = const_cast<Value*>(In);
}
- } else if (isa<InlineAsm>(In)) {
+ } else if (isa<MDString>(In) || isa<InlineAsm>(In) || isa<Instruction>(In)) {
Result = const_cast<Value*>(In);
}
-
+
// Cache the mapping in our local map structure
if (Result) {
ValueMap[In] = Result;
return Result;
}
-
- cerr << "LinkModules ValueMap: \n";
+#ifndef NDEBUG
+ dbgs() << "LinkModules ValueMap: \n";
PrintMap(ValueMap);
- cerr << "Couldn't remap value: " << (void*)In << " " << *In << "\n";
- assert(0 && "Couldn't remap value!");
+ dbgs() << "Couldn't remap value: " << (void*)In << " " << *In << "\n";
+ llvm_unreachable("Couldn't remap value!");
+#endif
return 0;
}
// If there is a conflict, rename the conflict.
if (GlobalValue *ConflictGV = cast_or_null<GlobalValue>(ST.lookup(Name))) {
- assert(ConflictGV->hasInternalLinkage() &&
+ assert(ConflictGV->hasLocalLinkage() &&
"Not conflicting with a static global, should link instead!");
GV->takeName(ConflictGV);
ConflictGV->setName(Name); // This will cause ConflictGV to get renamed
}
/// CopyGVAttributes - copy additional attributes (those not needed to construct
-/// a GlobalValue) from the SrcGV to the DestGV.
+/// 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.
unsigned Alignment = std::max(DestGV->getAlignment(), SrcGV->getAlignment());
static bool GetLinkageResult(GlobalValue *Dest, const GlobalValue *Src,
GlobalValue::LinkageTypes <, bool &LinkFromSrc,
std::string *Err) {
- assert((!Dest || !Src->hasInternalLinkage()) &&
+ assert((!Dest || !Src->hasLocalLinkage()) &&
"If Src has internal linkage, Dest shouldn't be set!");
if (!Dest) {
// Linking something to nothing.
if (Dest->isDeclaration()) {
LinkFromSrc = true;
LT = Src->getLinkage();
- }
+ }
} else if (Dest->hasExternalWeakLinkage()) {
- //If the Dest is weak, use the source linkage
+ // If the Dest is weak, use the source linkage.
LinkFromSrc = true;
LT = Src->getLinkage();
} else {
} else if (Src->isWeakForLinker()) {
// At this point we know that Dest has LinkOnce, External*, Weak, Common,
// or DLL* linkage.
- if ((Dest->hasLinkOnceLinkage() &&
- (Src->hasWeakLinkage() || Src->hasCommonLinkage())) ||
- Dest->hasExternalWeakLinkage()) {
+ if (Dest->hasExternalWeakLinkage() ||
+ Dest->hasAvailableExternallyLinkage() ||
+ (Dest->hasLinkOnceLinkage() &&
+ (Src->hasWeakLinkage() || Src->hasCommonLinkage()))) {
LinkFromSrc = true;
LT = Src->getLinkage();
} else {
return false;
}
+// Insert all of the named mdnoes in Src into the Dest module.
+static void LinkNamedMDNodes(Module *Dest, Module *Src) {
+ for (Module::const_named_metadata_iterator I = Src->named_metadata_begin(),
+ E = Src->named_metadata_end(); I != E; ++I) {
+ const NamedMDNode *SrcNMD = I;
+ NamedMDNode *DestNMD = Dest->getOrInsertNamedMetadata(SrcNMD->getName());
+ // Add Src elements into Dest node.
+ for (unsigned i = 0, e = SrcNMD->getNumOperands(); i != e; ++i)
+ DestNMD->addOperand(SrcNMD->getOperand(i));
+ }
+}
+
// LinkGlobals - Loop through the global variables in the src module and merge
// them into the dest module.
static bool LinkGlobals(Module *Dest, const Module *Src,
std::map<const Value*, Value*> &ValueMap,
std::multimap<std::string, GlobalVariable *> &AppendingVars,
std::string *Err) {
+ ValueSymbolTable &DestSymTab = Dest->getValueSymbolTable();
+
// Loop over all of the globals in the src module, mapping them over as we go
- for (Module::const_global_iterator I = Src->global_begin(), E = Src->global_end();
- I != E; ++I) {
+ for (Module::const_global_iterator I = Src->global_begin(),
+ E = Src->global_end(); I != E; ++I) {
const GlobalVariable *SGV = I;
GlobalValue *DGV = 0;
- // Check to see if may have to link the global with the global
- if (SGV->hasName() && !SGV->hasInternalLinkage()) {
- DGV = Dest->getGlobalVariable(SGV->getName());
- if (DGV && DGV->getType() != SGV->getType())
- // If types don't agree due to opaque types, try to resolve them.
- RecursiveResolveTypes(SGV->getType(), DGV->getType());
- }
-
- // Check to see if may have to link the global with the alias
- if (!DGV && SGV->hasName() && !SGV->hasInternalLinkage()) {
- DGV = Dest->getNamedAlias(SGV->getName());
- if (DGV && DGV->getType() != SGV->getType())
- // If types don't agree due to opaque types, try to resolve them.
- RecursiveResolveTypes(SGV->getType(), DGV->getType());
- }
+ // Check to see if may have to link the global with the global, alias or
+ // function.
+ if (SGV->hasName() && !SGV->hasLocalLinkage())
+ DGV = cast_or_null<GlobalValue>(DestSymTab.lookup(SGV->getName()));
- if (DGV && DGV->hasInternalLinkage())
+ // If we found a global with the same name in the dest module, but it has
+ // internal linkage, we are really not doing any linkage here.
+ if (DGV && DGV->hasLocalLinkage())
DGV = 0;
+ // If types don't agree due to opaque types, try to resolve them.
+ if (DGV && DGV->getType() != SGV->getType())
+ RecursiveResolveTypes(SGV->getType(), DGV->getType());
+
assert((SGV->hasInitializer() || SGV->hasExternalWeakLinkage() ||
SGV->hasExternalLinkage() || SGV->hasDLLImportLinkage()) &&
"Global must either be external or have an initializer!");
if (GetLinkageResult(DGV, SGV, NewLinkage, LinkFromSrc, Err))
return true;
- if (!DGV) {
+ if (DGV == 0) {
// No linking to be performed, simply create an identical version of the
// symbol over in the dest module... the initializer will be filled in
- // later by LinkGlobalInits...
+ // later by LinkGlobalInits.
GlobalVariable *NewDGV =
- new GlobalVariable(SGV->getType()->getElementType(),
+ new GlobalVariable(*Dest, SGV->getType()->getElementType(),
SGV->isConstant(), SGV->getLinkage(), /*init*/0,
- SGV->getName(), Dest, false,
+ SGV->getName(), 0, false,
SGV->getType()->getAddressSpace());
// Propagate alignment, visibility and section info.
CopyGVAttributes(NewDGV, SGV);
// If the LLVM runtime renamed the global, but it is an externally visible
// symbol, DGV must be an existing global with internal linkage. Rename
// it.
- if (NewDGV->getName() != SGV->getName() && !NewDGV->hasInternalLinkage())
+ if (!NewDGV->hasLocalLinkage() && NewDGV->getName() != SGV->getName())
ForceRenaming(NewDGV, SGV->getName());
- // Make sure to remember this mapping...
+ // Make sure to remember this mapping.
ValueMap[SGV] = NewDGV;
+ // Keep track that this is an appending variable.
if (SGV->hasAppendingLinkage())
- // Keep track that this is an appending variable...
AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV));
- } else if (DGV->hasAppendingLinkage()) {
+ continue;
+ }
+
+ // If the visibilities of the symbols disagree and the destination is a
+ // prototype, take the visibility of its input.
+ if (DGV->isDeclaration())
+ DGV->setVisibility(SGV->getVisibility());
+
+ if (DGV->hasAppendingLinkage()) {
// No linking is performed yet. Just insert a new copy of the global, and
// keep track of the fact that it is an appending variable in the
// AppendingVars map. The name is cleared out so that no linkage is
// performed.
GlobalVariable *NewDGV =
- new GlobalVariable(SGV->getType()->getElementType(),
+ new GlobalVariable(*Dest, SGV->getType()->getElementType(),
SGV->isConstant(), SGV->getLinkage(), /*init*/0,
- "", Dest, false,
+ "", 0, false,
SGV->getType()->getAddressSpace());
// Set alignment allowing CopyGVAttributes merge it with alignment of SGV.
// Keep track that this is an appending variable...
AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV));
- } else if (GlobalAlias *DGA = dyn_cast<GlobalAlias>(DGV)) {
- // SGV is global, but DGV is alias. The only valid mapping is when SGV is
- // external declaration, which is effectively a no-op. Also make sure
- // linkage calculation was correct.
- if (SGV->isDeclaration() && !LinkFromSrc) {
- // Make sure to remember this mapping...
- ValueMap[SGV] = DGA;
- } else
+ continue;
+ }
+
+ if (LinkFromSrc) {
+ if (isa<GlobalAlias>(DGV))
return Error(Err, "Global-Alias Collision on '" + SGV->getName() +
"': symbol multiple defined");
- } else if (GlobalVariable *DGVar = dyn_cast<GlobalVariable>(DGV)) {
- // Otherwise, perform the global-global mapping as instructed by
- // GetLinkageResult.
- if (LinkFromSrc) {
- // Propagate alignment, section, and visibility info.
- CopyGVAttributes(DGVar, SGV);
-
- // If the types don't match, and if we are to link from the source, nuke
- // DGV and create a new one of the appropriate type.
- if (SGV->getType() != DGVar->getType()) {
- GlobalVariable *NewDGV =
- new GlobalVariable(SGV->getType()->getElementType(),
- DGVar->isConstant(), DGVar->getLinkage(),
- /*init*/0, DGVar->getName(), Dest, false,
- SGV->getType()->getAddressSpace());
- CopyGVAttributes(NewDGV, DGVar);
- DGV->replaceAllUsesWith(ConstantExpr::getBitCast(NewDGV,
- DGVar->getType()));
- // DGVar will conflict with NewDGV because they both had the same
- // name. We must erase this now so ForceRenaming doesn't assert
- // because DGV might not have internal linkage.
- DGVar->eraseFromParent();
-
- // If the symbol table renamed the global, but it is an externally
- // visible symbol, DGV must be an existing global with internal
- // linkage. Rename it.
- if (NewDGV->getName() != SGV->getName() &&
- !NewDGV->hasInternalLinkage())
- ForceRenaming(NewDGV, SGV->getName());
-
- DGVar = NewDGV;
- }
- // Inherit const as appropriate
- DGVar->setConstant(SGV->isConstant());
+ // If the types don't match, and if we are to link from the source, nuke
+ // DGV and create a new one of the appropriate type. Note that the thing
+ // we are replacing may be a function (if a prototype, weak, etc) or a
+ // global variable.
+ GlobalVariable *NewDGV =
+ new GlobalVariable(*Dest, SGV->getType()->getElementType(),
+ SGV->isConstant(), NewLinkage, /*init*/0,
+ DGV->getName(), 0, false,
+ SGV->getType()->getAddressSpace());
- // Set initializer to zero, so we can link the stuff later
- DGVar->setInitializer(0);
- } else {
- // Special case for const propagation
- if (DGVar->isDeclaration() && SGV->isConstant() && !DGVar->isConstant())
- DGVar->setConstant(true);
- }
+ // Propagate alignment, section, and visibility info.
+ CopyGVAttributes(NewDGV, SGV);
+ DGV->replaceAllUsesWith(ConstantExpr::getBitCast(NewDGV,
+ DGV->getType()));
+
+ // DGV will conflict with NewDGV because they both had the same
+ // name. We must erase this now so ForceRenaming doesn't assert
+ // because DGV might not have internal linkage.
+ if (GlobalVariable *Var = dyn_cast<GlobalVariable>(DGV))
+ Var->eraseFromParent();
+ else
+ cast<Function>(DGV)->eraseFromParent();
+
+ // If the symbol table renamed the global, but it is an externally visible
+ // symbol, DGV must be an existing global with internal linkage. Rename.
+ if (NewDGV->getName() != SGV->getName() && !NewDGV->hasLocalLinkage())
+ ForceRenaming(NewDGV, SGV->getName());
- // Set calculated linkage
- DGVar->setLinkage(NewLinkage);
+ // Inherit const as appropriate.
+ NewDGV->setConstant(SGV->isConstant());
- // Make sure to remember this mapping...
- ValueMap[SGV] = ConstantExpr::getBitCast(DGVar, SGV->getType());
+ // Make sure to remember this mapping.
+ ValueMap[SGV] = NewDGV;
+ continue;
+ }
+
+ // Not "link from source", keep the one in the DestModule and remap the
+ // input onto it.
+
+ // Special case for const propagation.
+ if (GlobalVariable *DGVar = dyn_cast<GlobalVariable>(DGV))
+ if (DGVar->isDeclaration() && SGV->isConstant() && !DGVar->isConstant())
+ DGVar->setConstant(true);
+
+ // SGV is global, but DGV is alias.
+ if (isa<GlobalAlias>(DGV)) {
+ // The only valid mappings are:
+ // - SGV is external declaration, which is effectively a no-op.
+ // - SGV is weak, when we just need to throw SGV out.
+ if (!SGV->isDeclaration() && !SGV->isWeakForLinker())
+ return Error(Err, "Global-Alias Collision on '" + SGV->getName() +
+ "': symbol multiple defined");
}
+
+ // Set calculated linkage
+ DGV->setLinkage(NewLinkage);
+
+ // Make sure to remember this mapping...
+ ValueMap[SGV] = ConstantExpr::getBitCast(DGV, SGV->getType());
}
return false;
}
static GlobalValue::LinkageTypes
CalculateAliasLinkage(const GlobalValue *SGV, const GlobalValue *DGV) {
- if (SGV->hasExternalLinkage() || DGV->hasExternalLinkage())
+ GlobalValue::LinkageTypes SL = SGV->getLinkage();
+ GlobalValue::LinkageTypes DL = DGV->getLinkage();
+ if (SL == GlobalValue::ExternalLinkage || DL == GlobalValue::ExternalLinkage)
return GlobalValue::ExternalLinkage;
- else if (SGV->hasWeakLinkage() || DGV->hasWeakLinkage())
- return GlobalValue::WeakLinkage;
- else {
- assert(SGV->hasInternalLinkage() && DGV->hasInternalLinkage() &&
- "Unexpected linkage type");
+ else if (SL == GlobalValue::WeakAnyLinkage ||
+ DL == GlobalValue::WeakAnyLinkage)
+ return GlobalValue::WeakAnyLinkage;
+ else if (SL == GlobalValue::WeakODRLinkage ||
+ DL == GlobalValue::WeakODRLinkage)
+ return GlobalValue::WeakODRLinkage;
+ else if (SL == GlobalValue::InternalLinkage &&
+ DL == GlobalValue::InternalLinkage)
return GlobalValue::InternalLinkage;
+ else if (SL == GlobalValue::LinkerPrivateLinkage &&
+ DL == GlobalValue::LinkerPrivateLinkage)
+ return GlobalValue::LinkerPrivateLinkage;
+ else {
+ assert (SL == GlobalValue::PrivateLinkage &&
+ DL == GlobalValue::PrivateLinkage && "Unexpected linkage type");
+ return GlobalValue::PrivateLinkage;
}
}
GlobalValue* DGV = NULL;
// Try to find something 'similar' to SGA in destination module.
- if (!DGV && !SGA->hasInternalLinkage()) {
+ if (!DGV && !SGA->hasLocalLinkage()) {
DGV = Dest->getNamedAlias(SGA->getName());
// If types don't agree due to opaque types, try to resolve them.
if (DGV && DGV->getType() != SGA->getType())
- if (RecursiveResolveTypes(SGA->getType(), DGV->getType()))
- return Error(Err, "Alias Collision on '" + SGA->getName()+
- "': aliases have different types");
+ RecursiveResolveTypes(SGA->getType(), DGV->getType());
}
- if (!DGV && !SGA->hasInternalLinkage()) {
+ if (!DGV && !SGA->hasLocalLinkage()) {
DGV = Dest->getGlobalVariable(SGA->getName());
// If types don't agree due to opaque types, try to resolve them.
if (DGV && DGV->getType() != SGA->getType())
- if (RecursiveResolveTypes(SGA->getType(), DGV->getType()))
- return Error(Err, "Alias Collision on '" + SGA->getName()+
- "': aliases have different types");
+ RecursiveResolveTypes(SGA->getType(), DGV->getType());
}
- if (!DGV && !SGA->hasInternalLinkage()) {
+ if (!DGV && !SGA->hasLocalLinkage()) {
DGV = Dest->getFunction(SGA->getName());
// If types don't agree due to opaque types, try to resolve them.
if (DGV && DGV->getType() != SGA->getType())
- if (RecursiveResolveTypes(SGA->getType(), DGV->getType()))
- return Error(Err, "Alias Collision on '" + SGA->getName()+
- "': aliases have different types");
+ RecursiveResolveTypes(SGA->getType(), DGV->getType());
}
// No linking to be performed on internal stuff.
- if (DGV && DGV->hasInternalLinkage())
+ if (DGV && DGV->hasLocalLinkage())
DGV = NULL;
if (GlobalAlias *DGA = dyn_cast_or_null<GlobalAlias>(DGV)) {
} else {
// No linking to be performed, simply create an identical version of the
// alias over in the dest module...
-
+ Constant *Aliasee = DAliasee;
+ // Fixup aliases to bitcasts. Note that aliases to GEPs are still broken
+ // by this, but aliases to GEPs are broken to a lot of other things, so
+ // it's less important.
+ if (SGA->getType() != DAliasee->getType())
+ Aliasee = ConstantExpr::getBitCast(DAliasee, SGA->getType());
NewGA = new GlobalAlias(SGA->getType(), SGA->getLinkage(),
- SGA->getName(), DAliasee, Dest);
+ SGA->getName(), Aliasee, Dest);
CopyGVAttributes(NewGA, SGA);
// Proceed to 'common' steps
// If the symbol table renamed the alias, but it is an externally visible
// symbol, DGA must be an global value with internal linkage. Rename it.
if (NewGA->getName() != SGA->getName() &&
- !NewGA->hasInternalLinkage())
+ !NewGA->hasLocalLinkage())
ForceRenaming(NewGA, SGA->getName());
// Remember this mapping so uses in the source module get remapped
static bool LinkGlobalInits(Module *Dest, const Module *Src,
std::map<const Value*, Value*> &ValueMap,
std::string *Err) {
-
// Loop over all of the globals in the src module, mapping them over as we go
for (Module::const_global_iterator I = Src->global_begin(),
E = Src->global_end(); I != E; ++I) {
// Figure out what the initializer looks like in the dest module...
Constant *SInit =
cast<Constant>(RemapOperand(SGV->getInitializer(), ValueMap));
-
- GlobalVariable *DGV =
- cast<GlobalVariable>(ValueMap[SGV]->stripPointerCasts());
- if (DGV->hasInitializer()) {
- if (SGV->hasExternalLinkage()) {
- if (DGV->getInitializer() != SInit)
- return Error(Err, "Global Variable Collision on '" + SGV->getName() +
- "': global variables have different initializers");
- } else if (DGV->isWeakForLinker()) {
- // Nothing is required, mapped values will take the new global
- // automatically.
- } else if (SGV->isWeakForLinker()) {
- // Nothing is required, mapped values will take the new global
- // automatically.
- } else if (DGV->hasAppendingLinkage()) {
- assert(0 && "Appending linkage unimplemented!");
+ // Grab destination global variable or alias.
+ GlobalValue *DGV = cast<GlobalValue>(ValueMap[SGV]->stripPointerCasts());
+
+ // If dest if global variable, check that initializers match.
+ if (GlobalVariable *DGVar = dyn_cast<GlobalVariable>(DGV)) {
+ if (DGVar->hasInitializer()) {
+ if (SGV->hasExternalLinkage()) {
+ if (DGVar->getInitializer() != SInit)
+ return Error(Err, "Global Variable Collision on '" +
+ SGV->getName() +
+ "': global variables have different initializers");
+ } else if (DGVar->isWeakForLinker()) {
+ // Nothing is required, mapped values will take the new global
+ // automatically.
+ } else if (SGV->isWeakForLinker()) {
+ // Nothing is required, mapped values will take the new global
+ // automatically.
+ } else if (DGVar->hasAppendingLinkage()) {
+ llvm_unreachable("Appending linkage unimplemented!");
+ } else {
+ llvm_unreachable("Unknown linkage!");
+ }
} else {
- assert(0 && "Unknown linkage!");
+ // Copy the initializer over now...
+ DGVar->setInitializer(SInit);
}
} else {
- // Copy the initializer over now...
- DGV->setInitializer(SInit);
+ // Destination is alias, the only valid situation is when source is
+ // weak. Also, note, that we already checked linkage in LinkGlobals(),
+ // thus we assert here.
+ // FIXME: Should we weaken this assumption, 'dereference' alias and
+ // check for initializer of aliasee?
+ assert(SGV->isWeakForLinker());
}
}
}
static bool LinkFunctionProtos(Module *Dest, const Module *Src,
std::map<const Value*, Value*> &ValueMap,
std::string *Err) {
+ ValueSymbolTable &DestSymTab = Dest->getValueSymbolTable();
+
// Loop over all of the functions in the src module, mapping them over
for (Module::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) {
const Function *SF = I; // SrcFunction
-
GlobalValue *DGV = 0;
- Value *MappedDF;
-
- // If this function is internal or has no name, it doesn't participate in
- // linkage.
- if (SF->hasName() && !SF->hasInternalLinkage()) {
- // Check to see if may have to link the function.
- DGV = Dest->getFunction(SF->getName());
- }
- // Check to see if may have to link the function with the alias
- if (!DGV && SF->hasName() && !SF->hasInternalLinkage()) {
- DGV = Dest->getNamedAlias(SF->getName());
- if (DGV && DGV->getType() != SF->getType())
- // If types don't agree due to opaque types, try to resolve them.
- RecursiveResolveTypes(SF->getType(), DGV->getType());
- }
+ // Check to see if may have to link the function with the global, alias or
+ // function.
+ if (SF->hasName() && !SF->hasLocalLinkage())
+ DGV = cast_or_null<GlobalValue>(DestSymTab.lookup(SF->getName()));
- if (DGV && DGV->hasInternalLinkage())
+ // If we found a global with the same name in the dest module, but it has
+ // internal linkage, we are really not doing any linkage here.
+ if (DGV && DGV->hasLocalLinkage())
DGV = 0;
+ // If types don't agree due to opaque types, try to resolve them.
+ if (DGV && DGV->getType() != SF->getType())
+ RecursiveResolveTypes(SF->getType(), DGV->getType());
+
+ GlobalValue::LinkageTypes NewLinkage = GlobalValue::InternalLinkage;
+ bool LinkFromSrc = false;
+ if (GetLinkageResult(DGV, SF, NewLinkage, LinkFromSrc, Err))
+ return true;
+
// If there is no linkage to be performed, just bring over SF without
// modifying it.
if (DGV == 0) {
SF->getLinkage(),
SF->getName(), Dest);
CopyGVAttributes(NewDF, SF);
-
+
// If the LLVM runtime renamed the function, but it is an externally
// visible symbol, DF must be an existing function with internal linkage.
// Rename it.
- if (!NewDF->hasInternalLinkage() && NewDF->getName() != SF->getName())
+ if (!NewDF->hasLocalLinkage() && NewDF->getName() != SF->getName())
ForceRenaming(NewDF, SF->getName());
-
+
// ... and remember this mapping...
ValueMap[SF] = NewDF;
continue;
- } else if (GlobalAlias *DGA = dyn_cast<GlobalAlias>(DGV)) {
- // SF is function, but DF is alias.
- // The only valid mappings are:
- // - SF is external declaration, which is effectively a no-op.
- // - SF is weak, when we just need to throw SF out.
- if (!SF->isDeclaration() && !SF->isWeakForLinker())
+ }
+
+ // If the visibilities of the symbols disagree and the destination is a
+ // prototype, take the visibility of its input.
+ if (DGV->isDeclaration())
+ DGV->setVisibility(SF->getVisibility());
+
+ if (LinkFromSrc) {
+ if (isa<GlobalAlias>(DGV))
return Error(Err, "Function-Alias Collision on '" + SF->getName() +
"': symbol multiple defined");
- // Make sure to remember this mapping...
- ValueMap[SF] = ConstantExpr::getBitCast(DGA, SF->getType());
+ // We have a definition of the same name but different type in the
+ // source module. Copy the prototype to the destination and replace
+ // uses of the destination's prototype with the new prototype.
+ Function *NewDF = Function::Create(SF->getFunctionType(), NewLinkage,
+ SF->getName(), Dest);
+ CopyGVAttributes(NewDF, SF);
+
+ // Any uses of DF need to change to NewDF, with cast
+ DGV->replaceAllUsesWith(ConstantExpr::getBitCast(NewDF,
+ DGV->getType()));
+
+ // DF will conflict with NewDF because they both had the same. We must
+ // erase this now so ForceRenaming doesn't assert because DF might
+ // not have internal linkage.
+ if (GlobalVariable *Var = dyn_cast<GlobalVariable>(DGV))
+ Var->eraseFromParent();
+ else
+ cast<Function>(DGV)->eraseFromParent();
+
+ // If the symbol table renamed the function, but it is an externally
+ // visible symbol, DF must be an existing function with internal
+ // linkage. Rename it.
+ if (NewDF->getName() != SF->getName() && !NewDF->hasLocalLinkage())
+ ForceRenaming(NewDF, SF->getName());
+
+ // Remember this mapping so uses in the source module get remapped
+ // later by RemapOperand.
+ ValueMap[SF] = NewDF;
continue;
}
- Function* DF = cast<Function>(DGV);
- // If types don't agree because of opaque, try to resolve them.
- if (SF->getType() != DF->getType())
- RecursiveResolveTypes(SF->getType(), DF->getType());
-
- // Check visibility, merging if a definition overrides a prototype.
- if (SF->getVisibility() != DF->getVisibility()) {
- // If one is a prototype, ignore its visibility. Prototypes are always
- // overridden by the definition.
- if (!SF->isDeclaration() && !DF->isDeclaration())
- return Error(Err, "Linking functions named '" + SF->getName() +
- "': symbols have different visibilities!");
-
- // Otherwise, replace the visibility of DF if DF is a prototype.
- if (DF->isDeclaration())
- DF->setVisibility(SF->getVisibility());
+ // Not "link from source", keep the one in the DestModule and remap the
+ // input onto it.
+
+ if (isa<GlobalAlias>(DGV)) {
+ // The only valid mappings are:
+ // - SF is external declaration, which is effectively a no-op.
+ // - SF is weak, when we just need to throw SF out.
+ if (!SF->isDeclaration() && !SF->isWeakForLinker())
+ return Error(Err, "Function-Alias Collision on '" + SF->getName() +
+ "': symbol multiple defined");
}
-
- if (DF->getType() != SF->getType()) {
- if (DF->isDeclaration() && !SF->isDeclaration()) {
- // We have a definition of the same name but different type in the
- // source module. Copy the prototype to the destination and replace
- // uses of the destination's prototype with the new prototype.
- Function *NewDF = Function::Create(SF->getFunctionType(),
- SF->getLinkage(),
- SF->getName(), Dest);
- CopyGVAttributes(NewDF, SF);
-
- // Any uses of DF need to change to NewDF, with cast
- DF->replaceAllUsesWith(ConstantExpr::getBitCast(NewDF, DF->getType()));
-
- // DF will conflict with NewDF because they both had the same. We must
- // erase this now so ForceRenaming doesn't assert because DF might
- // not have internal linkage.
- DF->eraseFromParent();
- // If the symbol table renamed the function, but it is an externally
- // visible symbol, DF must be an existing function with internal
- // linkage. Rename it.
- if (NewDF->getName() != SF->getName() && !NewDF->hasInternalLinkage())
- ForceRenaming(NewDF, SF->getName());
+ // Set calculated linkage
+ DGV->setLinkage(NewLinkage);
- // Remember this mapping so uses in the source module get remapped
- // later by RemapOperand.
- ValueMap[SF] = NewDF;
- continue;
- } else {
- // We have two functions of the same name but different type. Any use
- // of the source must be mapped to the destination, with a cast.
- MappedDF = ConstantExpr::getBitCast(DF, SF->getType());
- }
- } else {
- MappedDF = DF;
- }
-
- if (SF->isDeclaration()) {
- // If SF is a declaration or if both SF & DF are declarations, just link
- // the declarations, we aren't adding anything.
- if (SF->hasDLLImportLinkage()) {
- if (DF->isDeclaration()) {
- ValueMap[SF] = MappedDF;
- DF->setLinkage(SF->getLinkage());
- }
- } else {
- ValueMap[SF] = MappedDF;
- }
- continue;
- }
-
- // If DF is external but SF is not, link the external functions, update
- // linkage qualifiers.
- if (DF->isDeclaration() && !DF->hasDLLImportLinkage()) {
- ValueMap.insert(std::make_pair(SF, MappedDF));
- DF->setLinkage(SF->getLinkage());
- continue;
- }
-
- // At this point we know that DF has LinkOnce, Weak, or External* linkage.
- if (SF->isWeakForLinker()) {
- ValueMap[SF] = MappedDF;
-
- // Linkonce+Weak = Weak
- // *+External Weak = *
- if ((DF->hasLinkOnceLinkage() &&
- (SF->hasWeakLinkage() || SF->hasCommonLinkage())) ||
- DF->hasExternalWeakLinkage())
- DF->setLinkage(SF->getLinkage());
- continue;
- }
-
- if (DF->isWeakForLinker()) {
- // At this point we know that SF has LinkOnce or External* linkage.
- ValueMap[SF] = MappedDF;
-
- // If the source function has stronger linkage than the destination,
- // its body and linkage should override ours.
- if (!SF->hasLinkOnceLinkage() && !SF->hasExternalWeakLinkage()) {
- // Don't inherit linkonce & external weak linkage.
- DF->setLinkage(SF->getLinkage());
- DF->deleteBody();
- }
- continue;
- }
-
- if (SF->getLinkage() != DF->getLinkage())
- return Error(Err, "Functions named '" + SF->getName() +
- "' have different linkage specifiers!");
-
- // The function is defined identically in both modules!
- if (SF->hasExternalLinkage())
- return Error(Err, "Function '" +
- ToStr(SF->getFunctionType(), Src) + "':\"" +
- SF->getName() + "\" - Function is already defined!");
- assert(0 && "Unknown linkage configuration found!");
+ // Make sure to remember this mapping.
+ ValueMap[SF] = ConstantExpr::getBitCast(DGV, SF->getType());
}
return false;
}
if (G1->getSection() != G2->getSection())
return Error(ErrorMsg,
"Appending variables with different section name need to be linked!");
-
+
unsigned NewSize = T1->getNumElements() + T2->getNumElements();
- ArrayType *NewType = ArrayType::get(T1->getElementType(), NewSize);
+ ArrayType *NewType = ArrayType::get(T1->getElementType(),
+ NewSize);
G1->setName(""); // Clear G1's name in case of a conflict!
-
+
// Create the new global variable...
GlobalVariable *NG =
- new GlobalVariable(NewType, G1->isConstant(), G1->getLinkage(),
- /*init*/0, First->first, M, G1->isThreadLocal(),
+ new GlobalVariable(*M, NewType, G1->isConstant(), G1->getLinkage(),
+ /*init*/0, First->first, 0, G1->isThreadLocal(),
G1->getType()->getAddressSpace());
// Propagate alignment, visibility and section info.
// FIXME: This should rewrite simple/straight-forward uses such as
// getelementptr instructions to not use the Cast!
- G1->replaceAllUsesWith(ConstantExpr::getBitCast(NG, G1->getType()));
- G2->replaceAllUsesWith(ConstantExpr::getBitCast(NG, G2->getType()));
+ G1->replaceAllUsesWith(ConstantExpr::getBitCast(NG,
+ G1->getType()));
+ G2->replaceAllUsesWith(ConstantExpr::getBitCast(NG,
+ G2->getType()));
// Remove the two globals from the module now...
M->getGlobalList().erase(G1);
static bool ResolveAliases(Module *Dest) {
for (Module::alias_iterator I = Dest->alias_begin(), E = Dest->alias_end();
I != E; ++I)
- if (const GlobalValue *GV = I->resolveAliasedGlobal())
- if (!GV->isDeclaration())
- I->replaceAllUsesWith(const_cast<GlobalValue*>(GV));
+ // We can't sue resolveGlobalAlias here because we need to preserve
+ // bitcasts and GEPs.
+ if (const Constant *C = I->getAliasee()) {
+ while (dyn_cast<GlobalAlias>(C))
+ C = cast<GlobalAlias>(C)->getAliasee();
+ const GlobalValue *GV = dyn_cast<GlobalValue>(C);
+ if (C != I && !(GV && GV->isDeclaration()))
+ I->replaceAllUsesWith(const_cast<Constant*>(C));
+ }
return false;
}
// Copy the target triple from the source to dest if the dest's is empty.
if (Dest->getTargetTriple().empty() && !Src->getTargetTriple().empty())
Dest->setTargetTriple(Src->getTargetTriple());
-
+
if (!Src->getDataLayout().empty() && !Dest->getDataLayout().empty() &&
Src->getDataLayout() != Dest->getDataLayout())
- cerr << "WARNING: Linking two modules of different data layouts!\n";
+ errs() << "WARNING: Linking two modules of different data layouts!\n";
if (!Src->getTargetTriple().empty() &&
Dest->getTargetTriple() != Src->getTargetTriple())
- cerr << "WARNING: Linking two modules of different target triples!\n";
+ errs() << "WARNING: Linking two modules of different target triples!\n";
// Append the module inline asm string.
if (!Src->getModuleInlineAsm().empty()) {
Dest->setModuleInlineAsm(Dest->getModuleInlineAsm()+"\n"+
Src->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 = Src->lib_begin(), SE = Src->lib_end();
- SI != SE; ++SI)
+ SI != SE; ++SI)
Dest->addLibrary(*SI);
// LinkTypes - Go through the symbol table of the Src module and see if any
// types are named in the src module that are not named in the Dst module.
// Make sure there are no type name conflicts.
- if (LinkTypes(Dest, Src, ErrorMsg))
+ if (LinkTypes(Dest, Src, ErrorMsg))
return true;
// ValueMap - Mapping of values from what they used to be in Src, to what they
AppendingVars.insert(std::make_pair(I->getName(), I));
}
+ // Insert all of the named mdnoes in Src into the Dest module.
+ LinkNamedMDNodes(Dest, Src);
+
// Insert all of the globals in src into the Dest module... without linking
// initializers (which could refer to functions not yet mapped over).
if (LinkGlobals(Dest, Src, ValueMap, AppendingVars, ErrorMsg))
projects / oota-llvm.git / blobdiff