-//===- Linker.cpp - Module Linker Implementation --------------------------===//
+//===- lib/Linker/LinkModules.cpp - Module Linker Implementation ----------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
//
// This file implements the LLVM module linker.
//
//
//===----------------------------------------------------------------------===//
-#include "llvm/Transforms/Utils/Linker.h"
+#include "llvm/Linker.h"
+#include "llvm/Constants.h"
+#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
-#include "llvm/Function.h"
-#include "llvm/BasicBlock.h"
-#include "llvm/GlobalVariable.h"
#include "llvm/SymbolTable.h"
-#include "llvm/DerivedTypes.h"
-#include "llvm/iOther.h"
-#include "llvm/Constants.h"
-#include "llvm/Argument.h"
+#include "llvm/Instructions.h"
+#include "llvm/Assembly/Writer.h"
+#include "llvm/System/Path.h"
#include <iostream>
-using std::cerr;
-using std::string;
-using std::map;
+#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(string *E, string Message) {
+static inline bool Error(std::string *E, const std::string &Message) {
if (E) *E = Message;
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:
+// Attempt to link the two specified types together.
+//
+// Inputs:
+// DestTy - The type to which we wish to resolve.
+// SrcTy - The original type which we want to resolve.
+// Name - The name of the type.
+//
+// Outputs:
+// DestST - The symbol table in which the new type should be placed.
+//
+// Return value:
+// true - There is an error and the types cannot yet be linked.
+// false - No errors.
+//
+static bool ResolveTypes(const Type *DestTy, const Type *SrcTy,
+ SymbolTable *DestST, const std::string &Name) {
+ if (DestTy == SrcTy) return false; // If already equal, noop
+
+ // Does the type already exist in the module?
+ if (DestTy && !isa<OpaqueType>(DestTy)) { // Yup, the type already exists...
+ if (const OpaqueType *OT = dyn_cast<OpaqueType>(SrcTy)) {
+ const_cast<OpaqueType*>(OT)->refineAbstractTypeTo(DestTy);
+ } else {
+ return true; // Cannot link types... neither is opaque and not-equal
+ }
+ } else { // Type not in dest module. Add it now.
+ if (DestTy) // Type _is_ in module, just opaque...
+ const_cast<OpaqueType*>(cast<OpaqueType>(DestTy))
+ ->refineAbstractTypeTo(SrcTy);
+ else if (!Name.empty())
+ DestST->insert(Name, const_cast<Type*>(SrcTy));
+ }
+ return false;
+}
+
+static const FunctionType *getFT(const PATypeHolder &TH) {
+ return cast<FunctionType>(TH.get());
+}
+static const StructType *getST(const PATypeHolder &TH) {
+ return cast<StructType>(TH.get());
+}
+
+// RecursiveResolveTypes - This is just like ResolveTypes, except that it
+// recurses down into derived types, merging the used types if the parent types
+// are compatible.
+static bool RecursiveResolveTypesI(const PATypeHolder &DestTy,
+ const PATypeHolder &SrcTy,
+ SymbolTable *DestST, const std::string &Name,
+ std::vector<std::pair<PATypeHolder, PATypeHolder> > &Pointers) {
+ const Type *SrcTyT = SrcTy.get();
+ const Type *DestTyT = DestTy.get();
+ if (DestTyT == SrcTyT) return false; // If already equal, noop
+
+ // If we found our opaque type, resolve it now!
+ if (isa<OpaqueType>(DestTyT) || isa<OpaqueType>(SrcTyT))
+ return ResolveTypes(DestTyT, SrcTyT, DestST, Name);
+
+ // Two types cannot be resolved together if they are of different primitive
+ // type. For example, we cannot resolve an int to a float.
+ if (DestTyT->getTypeID() != SrcTyT->getTypeID()) return true;
+
+ // Otherwise, resolve the used type used by this derived type...
+ switch (DestTyT->getTypeID()) {
+ case Type::FunctionTyID: {
+ if (cast<FunctionType>(DestTyT)->isVarArg() !=
+ cast<FunctionType>(SrcTyT)->isVarArg() ||
+ cast<FunctionType>(DestTyT)->getNumContainedTypes() !=
+ cast<FunctionType>(SrcTyT)->getNumContainedTypes())
+ return true;
+ for (unsigned i = 0, e = getFT(DestTy)->getNumContainedTypes(); i != e; ++i)
+ if (RecursiveResolveTypesI(getFT(DestTy)->getContainedType(i),
+ getFT(SrcTy)->getContainedType(i), DestST, "",
+ Pointers))
+ return true;
+ return false;
+ }
+ case Type::StructTyID: {
+ if (getST(DestTy)->getNumContainedTypes() !=
+ getST(SrcTy)->getNumContainedTypes()) return 1;
+ for (unsigned i = 0, e = getST(DestTy)->getNumContainedTypes(); i != e; ++i)
+ if (RecursiveResolveTypesI(getST(DestTy)->getContainedType(i),
+ getST(SrcTy)->getContainedType(i), DestST, "",
+ Pointers))
+ return true;
+ return false;
+ }
+ case Type::ArrayTyID: {
+ const ArrayType *DAT = cast<ArrayType>(DestTy.get());
+ const ArrayType *SAT = cast<ArrayType>(SrcTy.get());
+ if (DAT->getNumElements() != SAT->getNumElements()) return true;
+ return RecursiveResolveTypesI(DAT->getElementType(), SAT->getElementType(),
+ DestST, "", Pointers);
+ }
+ case Type::PointerTyID: {
+ // 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
+ // in the container) change whenever types get resolved...
+ for (unsigned i = 0, e = Pointers.size(); i != e; ++i)
+ if (Pointers[i].first == DestTy)
+ return Pointers[i].second != SrcTy;
+
+ // Otherwise, add the current pointers to the vector to stop recursion on
+ // this pair.
+ Pointers.push_back(std::make_pair(DestTyT, SrcTyT));
+ bool Result =
+ RecursiveResolveTypesI(cast<PointerType>(DestTy.get())->getElementType(),
+ cast<PointerType>(SrcTy.get())->getElementType(),
+ DestST, "", Pointers);
+ Pointers.pop_back();
+ return Result;
+ }
+ default: assert(0 && "Unexpected type!"); return true;
+ }
+}
+
+static bool RecursiveResolveTypes(const PATypeHolder &DestTy,
+ const PATypeHolder &SrcTy,
+ SymbolTable *DestST, const std::string &Name){
+ std::vector<std::pair<PATypeHolder, PATypeHolder> > PointerTypes;
+ return RecursiveResolveTypesI(DestTy, SrcTy, DestST, Name, PointerTypes);
+}
+
+
// 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.
-//
-static bool LinkTypes(Module *Dest, const Module *Src, string *Err = 0) {
- // No symbol table? Can't have named types.
- if (!Src->hasSymbolTable()) return false;
-
- SymbolTable *DestST = Dest->getSymbolTableSure();
- const SymbolTable *SrcST = Src->getSymbolTable();
+static bool LinkTypes(Module *Dest, const Module *Src, std::string *Err) {
+ SymbolTable *DestST = &Dest->getSymbolTable();
+ const SymbolTable *SrcST = &Src->getSymbolTable();
// Look for a type plane for Type's...
- SymbolTable::const_iterator PI = SrcST->find(Type::TypeTy);
- if (PI == SrcST->end()) return false; // No named types, do nothing.
+ SymbolTable::type_const_iterator TI = SrcST->type_begin();
+ SymbolTable::type_const_iterator TE = SrcST->type_end();
+ if (TI == TE) return false; // No named types, do nothing.
- const SymbolTable::VarMap &VM = PI->second;
- for (SymbolTable::type_const_iterator I = VM.begin(), E = VM.end();
- I != E; ++I) {
- const string &Name = I->first;
- const Type *RHS = cast<Type>(I->second);
+ // Some types cannot be resolved immediately because they depend on other
+ // types being resolved to each other first. This contains a list of types we
+ // are waiting to recheck.
+ std::vector<std::string> DelayedTypesToResolve;
+
+ for ( ; TI != TE; ++TI ) {
+ const std::string &Name = TI->first;
+ const Type *RHS = TI->second;
// Check to see if this type name is already in the dest module...
- const Type *Entry = cast_or_null<Type>(DestST->lookup(Type::TypeTy, Name));
- if (Entry) { // Yup, the value already exists...
- if (Entry != RHS) // If it's the same, noop. Otherwise, error.
- return Error(Err, "Type named '" + Name +
- "' of different shape in modules.\n Src='" +
- Entry->getDescription() + "'.\n Dst='" +
- RHS->getDescription() + "'");
- } else { // Type not in dest module. Add it now.
- // TODO: FIXME WHEN TYPES AREN'T CONST
- DestST->insert(Name, const_cast<Type*>(RHS));
+ Type *Entry = DestST->lookupType(Name);
+
+ if (ResolveTypes(Entry, RHS, DestST, Name)) {
+ // They look different, save the types 'till later to resolve.
+ DelayedTypesToResolve.push_back(Name);
+ }
+ }
+
+ // Iteratively resolve types while we can...
+ while (!DelayedTypesToResolve.empty()) {
+ // Loop over all of the types, attempting to resolve them if possible...
+ unsigned OldSize = DelayedTypesToResolve.size();
+
+ // Try direct resolution by name...
+ for (unsigned i = 0; i != DelayedTypesToResolve.size(); ++i) {
+ const std::string &Name = DelayedTypesToResolve[i];
+ Type *T1 = SrcST->lookupType(Name);
+ Type *T2 = DestST->lookupType(Name);
+ if (!ResolveTypes(T2, T1, DestST, Name)) {
+ // We are making progress!
+ DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i);
+ --i;
+ }
+ }
+
+ // Did we not eliminate any types?
+ if (DelayedTypesToResolve.size() == OldSize) {
+ // Attempt to resolve subelements of types. This allows us to merge these
+ // two types: { int* } and { opaque* }
+ for (unsigned i = 0, e = DelayedTypesToResolve.size(); i != e; ++i) {
+ const std::string &Name = DelayedTypesToResolve[i];
+ PATypeHolder T1(SrcST->lookupType(Name));
+ PATypeHolder T2(DestST->lookupType(Name));
+
+ if (!RecursiveResolveTypes(T2, T1, DestST, Name)) {
+ // We are making progress!
+ DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i);
+
+ // Go back to the main loop, perhaps we can resolve directly by name
+ // now...
+ break;
+ }
+ }
+
+ // If we STILL cannot resolve the types, then there is something wrong.
+ if (DelayedTypesToResolve.size() == OldSize) {
+ // Remove the symbol name from the destination.
+ DelayedTypesToResolve.pop_back();
+ }
}
}
+
+
return false;
}
-static void PrintMap(const map<const Value*, Value*> &M) {
- for (map<const Value*, Value*>::const_iterator I = M.begin(), E = M.end();
+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 << " ";
+ std::cerr << " Fr: " << (void*)I->first << " ";
I->first->dump();
- cerr << " To: " << (void*)I->second << " ";
+ std::cerr << " To: " << (void*)I->second << " ";
I->second->dump();
- cerr << "\n";
+ std::cerr << "\n";
}
}
-// RemapOperand - Use LocalMap and GlobalMap to convert references from one
-// module to another. This is somewhat sophisticated in that it can
-// automatically handle constant references correctly as well...
-//
-static Value *RemapOperand(const Value *In, map<const Value*, Value*> &LocalMap,
- const map<const Value*, Value*> *GlobalMap = 0) {
- map<const Value*,Value*>::const_iterator I = LocalMap.find(In);
- if (I != LocalMap.end()) return I->second;
-
- if (GlobalMap) {
- I = GlobalMap->find(In);
- if (I != GlobalMap->end()) return I->second;
- }
+// RemapOperand - Use ValueMap to convert references from one module to another.
+// This is somewhat sophisticated in that it can automatically handle constant
+// references correctly as well.
+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()) return I->second;
- // Check to see if it's a constant that we are interesting in transforming...
+ // Check to see if it's a constant that we are interesting in transforming.
+ Value *Result = 0;
if (const Constant *CPV = dyn_cast<Constant>(In)) {
- if (!isa<DerivedType>(CPV->getType()) && !isa<ConstantExpr>(CPV))
- return const_cast<Constant*>(CPV); // Simple constants stay identical...
-
- Constant *Result = 0;
+ if ((!isa<DerivedType>(CPV->getType()) && !isa<ConstantExpr>(CPV)) ||
+ isa<ConstantAggregateZero>(CPV))
+ return const_cast<Constant*>(CPV); // Simple constants stay identical.
if (const ConstantArray *CPA = dyn_cast<ConstantArray>(CPV)) {
- const std::vector<Use> &Ops = CPA->getValues();
- std::vector<Constant*> Operands(Ops.size());
- for (unsigned i = 0, e = Ops.size(); i != e; ++i)
- Operands[i] =
- cast<Constant>(RemapOperand(Ops[i], LocalMap, GlobalMap));
+ std::vector<Constant*> Operands(CPA->getNumOperands());
+ for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
+ Operands[i] =cast<Constant>(RemapOperand(CPA->getOperand(i), ValueMap));
Result = ConstantArray::get(cast<ArrayType>(CPA->getType()), Operands);
} else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(CPV)) {
- const std::vector<Use> &Ops = CPS->getValues();
- std::vector<Constant*> Operands(Ops.size());
- for (unsigned i = 0; i < Ops.size(); ++i)
- Operands[i] =
- cast<Constant>(RemapOperand(Ops[i], LocalMap, GlobalMap));
+ std::vector<Constant*> Operands(CPS->getNumOperands());
+ for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
+ Operands[i] =cast<Constant>(RemapOperand(CPS->getOperand(i), ValueMap));
Result = ConstantStruct::get(cast<StructType>(CPS->getType()), Operands);
- } else if (isa<ConstantPointerNull>(CPV)) {
+ } else if (isa<ConstantPointerNull>(CPV) || isa<UndefValue>(CPV)) {
Result = const_cast<Constant*>(CPV);
- } else if (const ConstantPointerRef *CPR =
- dyn_cast<ConstantPointerRef>(CPV)) {
- Value *V = RemapOperand(CPR->getValue(), LocalMap, GlobalMap);
- Result = ConstantPointerRef::get(cast<GlobalValue>(V));
+ } else if (isa<GlobalValue>(CPV)) {
+ Result = cast<Constant>(RemapOperand(CPV, ValueMap));
+ } else if (const ConstantPacked *CP = dyn_cast<ConstantPacked>(CPV)) {
+ std::vector<Constant*> Operands(CP->getNumOperands());
+ for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
+ Operands[i] = cast<Constant>(RemapOperand(CP->getOperand(i), ValueMap));
+ Result = ConstantPacked::get(Operands);
} else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
- if (CE->getNumOperands() == 1) {
- // Cast instruction, unary operator
- Value *V = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap);
- Result = ConstantExpr::get(CE->getOpcode(), cast<Constant>(V),
- CE->getType());
- } else if (CE->getNumOperands() == 2) {
- // Binary operator...
- Value *V1 = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap);
- Value *V2 = RemapOperand(CE->getOperand(1), LocalMap, GlobalMap);
-
- Result = ConstantExpr::get(CE->getOpcode(), cast<Constant>(V1),
- cast<Constant>(V2), CE->getType());
- } else {
- // GetElementPtr Expression
- assert(CE->getOpcode() == Instruction::GetElementPtr);
- Value *Ptr = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap);
+ if (CE->getOpcode() == Instruction::GetElementPtr) {
+ Value *Ptr = RemapOperand(CE->getOperand(0), ValueMap);
std::vector<Constant*> Indices;
Indices.reserve(CE->getNumOperands()-1);
for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i)
Indices.push_back(cast<Constant>(RemapOperand(CE->getOperand(i),
- LocalMap, GlobalMap)));
+ ValueMap)));
+
+ Result = ConstantExpr::getGetElementPtr(cast<Constant>(Ptr), Indices);
+ } else if (CE->getOpcode() == Instruction::ExtractElement) {
+ Value *Ptr = RemapOperand(CE->getOperand(0), ValueMap);
+ Value *Idx = RemapOperand(CE->getOperand(1), ValueMap);
+ Result = ConstantExpr::getExtractElement(cast<Constant>(Ptr),
+ cast<Constant>(Idx));
+ } else if (CE->getOpcode() == Instruction::InsertElement) {
+ Value *Ptr = RemapOperand(CE->getOperand(0), ValueMap);
+ Value *Elt = RemapOperand(CE->getOperand(1), ValueMap);
+ Value *Idx = RemapOperand(CE->getOperand(2), ValueMap);
+ Result = ConstantExpr::getInsertElement(cast<Constant>(Ptr),
+ cast<Constant>(Elt),
+ cast<Constant>(Idx));
+ } else if (CE->getOpcode() == Instruction::ShuffleVector) {
+ Value *V1 = RemapOperand(CE->getOperand(0), ValueMap);
+ Value *V2 = RemapOperand(CE->getOperand(1), ValueMap);
+ Result = ConstantExpr::getShuffleVector(cast<Constant>(V1),
+ cast<Constant>(V2),
+ cast<Constant>(CE->getOperand(2)));
+ } else if (CE->getNumOperands() == 1) {
+ // Cast instruction
+ assert(CE->getOpcode() == Instruction::Cast);
+ Value *V = RemapOperand(CE->getOperand(0), ValueMap);
+ Result = ConstantExpr::getCast(cast<Constant>(V), CE->getType());
+ } else if (CE->getNumOperands() == 3) {
+ // Select instruction
+ assert(CE->getOpcode() == Instruction::Select);
+ Value *V1 = RemapOperand(CE->getOperand(0), ValueMap);
+ Value *V2 = RemapOperand(CE->getOperand(1), ValueMap);
+ Value *V3 = RemapOperand(CE->getOperand(2), ValueMap);
+ Result = ConstantExpr::getSelect(cast<Constant>(V1), cast<Constant>(V2),
+ cast<Constant>(V3));
+ } else if (CE->getNumOperands() == 2) {
+ // Binary operator...
+ Value *V1 = RemapOperand(CE->getOperand(0), ValueMap);
+ Value *V2 = RemapOperand(CE->getOperand(1), ValueMap);
- Result = ConstantExpr::get(CE->getOpcode(), cast<Constant>(Ptr),
- Indices, CE->getType());
+ Result = ConstantExpr::get(CE->getOpcode(), cast<Constant>(V1),
+ cast<Constant>(V2));
+ } else {
+ assert(0 && "Unknown constant expr type!");
}
} else {
assert(0 && "Unknown type of derived type constant value!");
}
-
- // Cache the mapping in our local map structure...
- LocalMap.insert(std::make_pair(In, Result));
+ } else if (isa<InlineAsm>(In)) {
+ Result = const_cast<Value*>(In);
+ }
+
+ // Cache the mapping in our local map structure...
+ if (Result) {
+ ValueMap.insert(std::make_pair(In, Result));
return Result;
}
+
- cerr << "XXX LocalMap: \n";
- PrintMap(LocalMap);
-
- if (GlobalMap) {
- cerr << "XXX GlobalMap: \n";
- PrintMap(*GlobalMap);
- }
+ std::cerr << "LinkModules ValueMap: \n";
+ PrintMap(ValueMap);
- cerr << "Couldn't remap value: " << (void*)In << " " << *In << "\n";
+ std::cerr << "Couldn't remap value: " << (void*)In << " " << *In << "\n";
assert(0 && "Couldn't remap value!");
return 0;
}
+/// 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.
+static void ForceRenaming(GlobalValue *GV, const std::string &Name) {
+ assert(GV->getName() != Name && "Can't force rename to self");
+ SymbolTable &ST = GV->getParent()->getSymbolTable();
+
+ // If there is a conflict, rename the conflict.
+ Value *ConflictVal = ST.lookup(GV->getType(), Name);
+ assert(ConflictVal&&"Why do we have to force rename if there is no conflic?");
+ GlobalValue *ConflictGV = cast<GlobalValue>(ConflictVal);
+ assert(ConflictGV->hasInternalLinkage() &&
+ "Not conflicting with a static global, should link instead!");
+
+ ConflictGV->setName(""); // Eliminate the conflict
+ GV->setName(Name); // Force the name back
+ ConflictGV->setName(Name); // This will cause ConflictGV to get renamed
+ assert(GV->getName() == Name && ConflictGV->getName() != Name &&
+ "ForceRenaming didn't work");
+}
+
+/// 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.
+static bool GetLinkageResult(GlobalValue *Dest, GlobalValue *Src,
+ GlobalValue::LinkageTypes <, bool &LinkFromSrc,
+ std::string *Err) {
+ assert((!Dest || !Src->hasInternalLinkage()) &&
+ "If Src has internal linkage, Dest shouldn't be set!");
+ if (!Dest) {
+ // Linking something to nothing.
+ LinkFromSrc = true;
+ LT = Src->getLinkage();
+ } else if (Src->isExternal()) {
+ // If Src is external or if both Src & Drc are external.. Just link the
+ // external globals, we aren't adding anything.
+ LinkFromSrc = false;
+ LT = Dest->getLinkage();
+ } else if (Dest->isExternal()) {
+ // If Dest is external but Src is not:
+ LinkFromSrc = true;
+ LT = Src->getLinkage();
+ } else if (Src->hasAppendingLinkage() || Dest->hasAppendingLinkage()) {
+ if (Src->getLinkage() != Dest->getLinkage())
+ return Error(Err, "Linking globals named '" + Src->getName() +
+ "': can only link appending global with another appending global!");
+ LinkFromSrc = true; // Special cased.
+ LT = Src->getLinkage();
+ } else if (Src->hasWeakLinkage() || Src->hasLinkOnceLinkage()) {
+ // At this point we know that Dest has LinkOnce, External or Weak linkage.
+ if (Dest->hasLinkOnceLinkage() && Src->hasWeakLinkage()) {
+ LinkFromSrc = true;
+ LT = Src->getLinkage();
+ } else {
+ LinkFromSrc = false;
+ LT = Dest->getLinkage();
+ }
+ } else if (Dest->hasWeakLinkage() || Dest->hasLinkOnceLinkage()) {
+ // At this point we know that Src has External linkage.
+ LinkFromSrc = true;
+ LT = GlobalValue::ExternalLinkage;
+ } else {
+ assert(Dest->hasExternalLinkage() && Src->hasExternalLinkage() &&
+ "Unexpected linkage type!");
+ return Error(Err, "Linking globals named '" + Src->getName() +
+ "': symbol multiply defined!");
+ }
+ return false;
+}
// 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,
- map<const Value*, Value*> &ValueMap, string *Err = 0) {
+// them into the dest module.
+static bool LinkGlobals(Module *Dest, Module *Src,
+ std::map<const Value*, Value*> &ValueMap,
+ std::multimap<std::string, GlobalVariable *> &AppendingVars,
+ std::map<std::string, GlobalValue*> &GlobalsByName,
+ std::string *Err) {
// We will need a module level symbol table if the src module has a module
// level symbol table...
- SymbolTable *ST = Src->getSymbolTable() ? Dest->getSymbolTableSure() : 0;
-
+ SymbolTable *ST = (SymbolTable*)&Dest->getSymbolTable();
+
// Loop over all of the globals in the src module, mapping them over as we go
- //
- for (Module::const_giterator I = Src->gbegin(), E = Src->gend(); I != E; ++I){
- const GlobalVariable *SGV = I;
- Value *V;
-
- // If the global variable has a name, and that name is already in use in the
- // Dest module, make sure that the name is a compatible global variable...
- //
- if (SGV->hasExternalLinkage() && SGV->hasName() &&
- (V = ST->lookup(SGV->getType(), SGV->getName())) &&
- cast<GlobalVariable>(V)->hasExternalLinkage()) {
- // The same named thing is a global variable, because the only two things
- // that may be in a module level symbol table are Global Vars and
- // Functions, and they both have distinct, nonoverlapping, possible types.
- //
- GlobalVariable *DGV = cast<GlobalVariable>(V);
-
- // Check to see if the two GV's have the same Const'ness...
- if (SGV->isConstant() != DGV->isConstant())
- return Error(Err, "Global Variable Collision on '" +
- SGV->getType()->getDescription() + "':%" + SGV->getName() +
- " - Global variables differ in const'ness");
-
- // Okay, everything is cool, remember the mapping...
- ValueMap.insert(std::make_pair(SGV, DGV));
- } else {
+ for (Module::global_iterator I = Src->global_begin(), E = Src->global_end();
+ I != E; ++I) {
+ GlobalVariable *SGV = I;
+ GlobalVariable *DGV = 0;
+ // Check to see if may have to link the global.
+ if (SGV->hasName() && !SGV->hasInternalLinkage())
+ if (!(DGV = Dest->getGlobalVariable(SGV->getName(),
+ SGV->getType()->getElementType()))) {
+ std::map<std::string, GlobalValue*>::iterator EGV =
+ GlobalsByName.find(SGV->getName());
+ if (EGV != GlobalsByName.end())
+ DGV = dyn_cast<GlobalVariable>(EGV->second);
+ if (DGV)
+ // If types don't agree due to opaque types, try to resolve them.
+ RecursiveResolveTypes(SGV->getType(), DGV->getType(),ST, "");
+ }
+
+ if (DGV && DGV->hasInternalLinkage())
+ DGV = 0;
+
+ assert(SGV->hasInitializer() || SGV->hasExternalLinkage() &&
+ "Global must either be external or have an initializer!");
+
+ GlobalValue::LinkageTypes NewLinkage;
+ bool LinkFromSrc;
+ if (GetLinkageResult(DGV, SGV, NewLinkage, LinkFromSrc, Err))
+ return true;
+
+ if (!DGV) {
// 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...
- //
- GlobalVariable *DGV =
- new GlobalVariable(SGV->getType()->getElementType(), SGV->isConstant(),
- SGV->hasInternalLinkage(), 0, SGV->getName());
+ GlobalVariable *NewDGV =
+ new GlobalVariable(SGV->getType()->getElementType(),
+ SGV->isConstant(), SGV->getLinkage(), /*init*/0,
+ SGV->getName(), Dest);
+ // Propagate alignment info.
+ NewDGV->setAlignment(SGV->getAlignment());
+
+ // 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())
+ ForceRenaming(NewDGV, SGV->getName());
- // Add the new global to the dest module
- Dest->getGlobalList().push_back(DGV);
+ // Make sure to remember this mapping...
+ ValueMap.insert(std::make_pair(SGV, NewDGV));
+ if (SGV->hasAppendingLinkage())
+ // Keep track that this is an appending variable...
+ AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV));
+ } else 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(),
+ SGV->isConstant(), SGV->getLinkage(), /*init*/0,
+ "", Dest);
+
+ // Propagate alignment info.
+ NewDGV->setAlignment(std::max(DGV->getAlignment(), SGV->getAlignment()));
// Make sure to remember this mapping...
- ValueMap.insert(std::make_pair(SGV, DGV));
+ ValueMap.insert(std::make_pair(SGV, NewDGV));
+
+ // Keep track that this is an appending variable...
+ AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV));
+ } else {
+ // Propagate alignment info.
+ DGV->setAlignment(std::max(DGV->getAlignment(), SGV->getAlignment()));
+
+ // Otherwise, perform the mapping as instructed by GetLinkageResult. 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() != DGV->getType() && LinkFromSrc) {
+ GlobalVariable *NewDGV =
+ new GlobalVariable(SGV->getType()->getElementType(),
+ DGV->isConstant(), DGV->getLinkage());
+ NewDGV->setAlignment(DGV->getAlignment());
+ Dest->getGlobalList().insert(DGV, NewDGV);
+ DGV->replaceAllUsesWith(ConstantExpr::getCast(NewDGV, DGV->getType()));
+ DGV->eraseFromParent();
+ NewDGV->setName(SGV->getName());
+ DGV = NewDGV;
+ }
+
+ DGV->setLinkage(NewLinkage);
+
+ if (LinkFromSrc) {
+ // Inherit const as appropriate
+ DGV->setConstant(SGV->isConstant());
+ DGV->setInitializer(0);
+ } else {
+ if (SGV->isConstant() && !DGV->isConstant()) {
+ if (DGV->isExternal())
+ DGV->setConstant(true);
+ }
+ SGV->setLinkage(GlobalValue::ExternalLinkage);
+ SGV->setInitializer(0);
+ }
+
+ ValueMap.insert(std::make_pair(SGV,
+ ConstantExpr::getCast(DGV,
+ SGV->getType())));
}
}
return false;
// LinkGlobalInits - Update the initializers in the Dest module now that all
// globals that may be referenced are in Dest.
-//
static bool LinkGlobalInits(Module *Dest, const Module *Src,
- map<const Value*, Value*> &ValueMap,
- string *Err = 0) {
+ 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_giterator I = Src->gbegin(), E = Src->gend(); I != E; ++I){
+ for (Module::const_global_iterator I = Src->global_begin(),
+ E = Src->global_end(); I != E; ++I) {
const GlobalVariable *SGV = I;
if (SGV->hasInitializer()) { // Only process initialized GV's
// Figure out what the initializer looks like in the dest module...
- Constant *DInit =
+ Constant *SInit =
cast<Constant>(RemapOperand(SGV->getInitializer(), ValueMap));
- GlobalVariable *DGV = cast<GlobalVariable>(ValueMap[SGV]);
- if (DGV->hasInitializer() && SGV->hasExternalLinkage() &&
- DGV->hasExternalLinkage()) {
- if (DGV->getInitializer() != DInit)
- return Error(Err, "Global Variable Collision on '" +
- SGV->getType()->getDescription() + "':%" +SGV->getName()+
- " - Global variables have different initializers");
+ GlobalVariable *DGV = cast<GlobalVariable>(ValueMap[SGV]);
+ if (DGV->hasInitializer()) {
+ if (SGV->hasExternalLinkage()) {
+ if (DGV->getInitializer() != SInit)
+ return Error(Err, "Global Variable Collision on '" +
+ ToStr(SGV->getType(), Src) +"':%"+SGV->getName()+
+ " - Global variables have different initializers");
+ } else if (DGV->hasLinkOnceLinkage() || DGV->hasWeakLinkage()) {
+ // Nothing is required, mapped values will take the new global
+ // automatically.
+ } else if (SGV->hasLinkOnceLinkage() || SGV->hasWeakLinkage()) {
+ // Nothing is required, mapped values will take the new global
+ // automatically.
+ } else if (DGV->hasAppendingLinkage()) {
+ assert(0 && "Appending linkage unimplemented!");
+ } else {
+ assert(0 && "Unknown linkage!");
+ }
} else {
// Copy the initializer over now...
- DGV->setInitializer(DInit);
+ DGV->setInitializer(SInit);
}
}
}
// to the Dest function...
//
static bool LinkFunctionProtos(Module *Dest, const Module *Src,
- map<const Value*, Value*> &ValueMap,
- string *Err = 0) {
- // We will need a module level symbol table if the src module has a module
- // level symbol table...
- SymbolTable *ST = Src->getSymbolTable() ? Dest->getSymbolTableSure() : 0;
-
+ std::map<const Value*, Value*> &ValueMap,
+ std::map<std::string, GlobalValue*> &GlobalsByName,
+ std::string *Err) {
+ SymbolTable *ST = (SymbolTable*)&Dest->getSymbolTable();
+
// Loop over all of the functions in the src module, mapping them over as we
// go
- //
for (Module::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) {
const Function *SF = I; // SrcFunction
- Value *V;
-
- // If the function has a name, and that name is already in use in the Dest
- // module, make sure that the name is a compatible function...
- //
- if (SF->hasExternalLinkage() && SF->hasName() &&
- (V = ST->lookup(SF->getType(), SF->getName())) &&
- cast<Function>(V)->hasExternalLinkage()) {
- // The same named thing is a Function, because the only two things
- // that may be in a module level symbol table are Global Vars and
- // Functions, and they both have distinct, nonoverlapping, possible types.
- //
- Function *DF = cast<Function>(V); // DestFunction
-
- // Check to make sure the function is not defined in both modules...
- if (!SF->isExternal() && !DF->isExternal())
- return Error(Err, "Function '" +
- SF->getFunctionType()->getDescription() + "':\"" +
- SF->getName() + "\" - Function is already defined!");
-
- // Otherwise, just remember this mapping...
- ValueMap.insert(std::make_pair(SF, DF));
- } else {
- // Function does not already exist, simply insert an external function
- // signature identical to SF into the dest module...
- Function *DF = new Function(SF->getFunctionType(),
- SF->hasInternalLinkage(),
- SF->getName());
+ Function *DF = 0;
+ if (SF->hasName() && !SF->hasInternalLinkage()) {
+ // Check to see if may have to link the function.
+ if (!(DF = Dest->getFunction(SF->getName(), SF->getFunctionType()))) {
+ std::map<std::string, GlobalValue*>::iterator EF =
+ GlobalsByName.find(SF->getName());
+ if (EF != GlobalsByName.end())
+ DF = dyn_cast<Function>(EF->second);
+ if (DF && RecursiveResolveTypes(SF->getType(), DF->getType(), ST, ""))
+ DF = 0; // FIXME: gross.
+ }
+ }
+
+ if (!DF || SF->hasInternalLinkage() || DF->hasInternalLinkage()) {
+ // Function does not already exist, simply insert an function signature
+ // identical to SF into the dest module...
+ Function *NewDF = new Function(SF->getFunctionType(), SF->getLinkage(),
+ SF->getName(), Dest);
+ NewDF->setCallingConv(SF->getCallingConv());
- // Add the function signature to the dest module...
- Dest->getFunctionList().push_back(DF);
+ // 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->getName() != SF->getName() && !NewDF->hasInternalLinkage())
+ ForceRenaming(NewDF, SF->getName());
// ... and remember this mapping...
+ ValueMap.insert(std::make_pair(SF, NewDF));
+ } else if (SF->isExternal()) {
+ // If SF is external or if both SF & DF are external.. Just link the
+ // external functions, we aren't adding anything.
+ ValueMap.insert(std::make_pair(SF, DF));
+ } else if (DF->isExternal()) { // If DF is external but SF is not...
+ // Link the external functions, update linkage qualifiers
+ ValueMap.insert(std::make_pair(SF, DF));
+ DF->setLinkage(SF->getLinkage());
+
+ } else if (SF->hasWeakLinkage() || SF->hasLinkOnceLinkage()) {
+ // At this point we know that DF has LinkOnce, Weak, or External linkage.
ValueMap.insert(std::make_pair(SF, DF));
+
+ // Linkonce+Weak = Weak
+ if (DF->hasLinkOnceLinkage() && SF->hasWeakLinkage())
+ DF->setLinkage(SF->getLinkage());
+
+ } else if (DF->hasWeakLinkage() || DF->hasLinkOnceLinkage()) {
+ // At this point we know that SF has LinkOnce or External linkage.
+ ValueMap.insert(std::make_pair(SF, DF));
+ if (!SF->hasLinkOnceLinkage()) // Don't inherit linkonce linkage
+ DF->setLinkage(SF->getLinkage());
+
+ } else if (SF->getLinkage() != DF->getLinkage()) {
+ return Error(Err, "Functions named '" + SF->getName() +
+ "' have different linkage specifiers!");
+ } else if (SF->hasExternalLinkage()) {
+ // The function is defined in both modules!!
+ return Error(Err, "Function '" +
+ ToStr(SF->getFunctionType(), Src) + "':\"" +
+ SF->getName() + "\" - Function is already defined!");
+ } else {
+ assert(0 && "Unknown linkage configuration found!");
}
}
return false;
// 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.
-//
-static bool LinkFunctionBody(Function *Dest, const Function *Src,
- const map<const Value*, Value*> &GlobalMap,
- string *Err = 0) {
+static bool LinkFunctionBody(Function *Dest, Function *Src,
+ std::map<const Value*, Value*> &GlobalMap,
+ std::string *Err) {
assert(Src && Dest && Dest->isExternal() && !Src->isExternal());
- map<const Value*, Value*> LocalMap; // Map for function local values
- // Go through and convert function arguments over...
- for (Function::const_aiterator I = Src->abegin(), E = Src->aend();
- I != E; ++I) {
- // Create the new function argument and add to the dest function...
- Argument *DFA = new Argument(I->getType(), I->getName());
- Dest->getArgumentList().push_back(DFA);
+ // Go through and convert function arguments over, remembering the mapping.
+ Function::arg_iterator DI = Dest->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 information over...
// Add a mapping to our local map
- LocalMap.insert(std::make_pair(I, DFA));
+ GlobalMap.insert(std::make_pair(I, DI));
}
- // Loop over all of the basic blocks, copying the instructions over...
- //
- for (Function::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) {
- // Create new basic block and add to mapping and the Dest function...
- BasicBlock *DBB = new BasicBlock(I->getName(), Dest);
- LocalMap.insert(std::make_pair(I, DBB));
-
- // Loop over all of the instructions in the src basic block, copying them
- // over. Note that this is broken in a strict sense because the cloned
- // instructions will still be referencing values in the Src module, not
- // the remapped values. In our case, however, we will not get caught and
- // so we can delay patching the values up until later...
- //
- for (BasicBlock::const_iterator II = I->begin(), IE = I->end();
- II != IE; ++II) {
- Instruction *DI = II->clone();
- DI->setName(II->getName());
- DBB->getInstList().push_back(DI);
- LocalMap.insert(std::make_pair(II, DI));
- }
- }
+ // Splice the body of the source function into the dest function.
+ Dest->getBasicBlockList().splice(Dest->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
for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I)
for (Instruction::op_iterator OI = I->op_begin(), OE = I->op_end();
OI != OE; ++OI)
- *OI = RemapOperand(*OI, LocalMap, &GlobalMap);
+ if (!isa<Instruction>(*OI) && !isa<BasicBlock>(*OI))
+ *OI = RemapOperand(*OI, GlobalMap);
+
+ // There is no need to map the arguments anymore.
+ for (Function::arg_iterator I = Src->arg_begin(), E = Src->arg_end();
+ I != E; ++I)
+ GlobalMap.erase(I);
return false;
}
// LinkFunctionBodies - Link in the function bodies that are defined in the
// source module into the DestModule. This consists basically of copying the
// function over and fixing up references to values.
-//
-static bool LinkFunctionBodies(Module *Dest, const Module *Src,
- map<const Value*, Value*> &ValueMap,
- string *Err = 0) {
+static bool LinkFunctionBodies(Module *Dest, Module *Src,
+ std::map<const Value*, Value*> &ValueMap,
+ std::string *Err) {
// Loop over all of the functions in the src module, mapping them over as we
// go
- //
- for (Module::const_iterator SF = Src->begin(), E = Src->end(); SF != E; ++SF){
+ for (Module::iterator SF = Src->begin(), E = Src->end(); SF != E; ++SF) {
if (!SF->isExternal()) { // No body if function is external
Function *DF = cast<Function>(ValueMap[SF]); // Destination function
// DF not external SF external?
- if (!DF->isExternal()) {
- if (Err)
- *Err = "Function '" + (SF->hasName() ? SF->getName() : string("")) +
- "' body multiply defined!";
- return true;
+ if (DF->isExternal()) {
+ // Only provide the function body if there isn't one already.
+ if (LinkFunctionBody(DF, SF, ValueMap, Err))
+ return true;
}
-
- if (LinkFunctionBody(DF, SF, ValueMap, Err)) return true;
}
}
return false;
}
+// LinkAppendingVars - If there were any appending global variables, link them
+// together now. Return true on error.
+static bool LinkAppendingVars(Module *M,
+ std::multimap<std::string, GlobalVariable *> &AppendingVars,
+ std::string *ErrorMsg) {
+ if (AppendingVars.empty()) return false; // Nothing to do.
+
+ // Loop over the multimap of appending vars, processing any variables with the
+ // same name, forming a new appending global variable with both of the
+ // initializers merged together, then rewrite references to the old variables
+ // and delete them.
+ std::vector<Constant*> Inits;
+ while (AppendingVars.size() > 1) {
+ // Get the first two elements in the map...
+ std::multimap<std::string,
+ GlobalVariable*>::iterator Second = AppendingVars.begin(), First=Second++;
+
+ // If the first two elements are for different names, there is no pair...
+ // Otherwise there is a pair, so link them together...
+ if (First->first == Second->first) {
+ GlobalVariable *G1 = First->second, *G2 = Second->second;
+ const ArrayType *T1 = cast<ArrayType>(G1->getType()->getElementType());
+ const ArrayType *T2 = cast<ArrayType>(G2->getType()->getElementType());
+
+ // Check to see that they two arrays agree on type...
+ if (T1->getElementType() != T2->getElementType())
+ return Error(ErrorMsg,
+ "Appending variables with different element types need to be linked!");
+ if (G1->isConstant() != G2->isConstant())
+ return Error(ErrorMsg,
+ "Appending variables linked with different const'ness!");
+
+ unsigned NewSize = T1->getNumElements() + T2->getNumElements();
+ 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);
+
+ // Merge the initializer...
+ Inits.reserve(NewSize);
+ if (ConstantArray *I = dyn_cast<ConstantArray>(G1->getInitializer())) {
+ for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i)
+ Inits.push_back(I->getOperand(i));
+ } else {
+ assert(isa<ConstantAggregateZero>(G1->getInitializer()));
+ Constant *CV = Constant::getNullValue(T1->getElementType());
+ for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i)
+ Inits.push_back(CV);
+ }
+ if (ConstantArray *I = dyn_cast<ConstantArray>(G2->getInitializer())) {
+ for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i)
+ Inits.push_back(I->getOperand(i));
+ } else {
+ assert(isa<ConstantAggregateZero>(G2->getInitializer()));
+ Constant *CV = Constant::getNullValue(T2->getElementType());
+ for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i)
+ Inits.push_back(CV);
+ }
+ NG->setInitializer(ConstantArray::get(NewType, Inits));
+ Inits.clear();
+
+ // Replace any uses of the two global variables with uses of the new
+ // global...
+
+ // FIXME: This should rewrite simple/straight-forward uses such as
+ // getelementptr instructions to not use the Cast!
+ G1->replaceAllUsesWith(ConstantExpr::getCast(NG, G1->getType()));
+ G2->replaceAllUsesWith(ConstantExpr::getCast(NG, G2->getType()));
+
+ // Remove the two globals from the module now...
+ M->getGlobalList().erase(G1);
+ M->getGlobalList().erase(G2);
+
+ // Put the new global into the AppendingVars map so that we can handle
+ // linking of more than two vars...
+ Second->second = NG;
+ }
+ AppendingVars.erase(First);
+ }
+
+ return false;
+}
// LinkModules - This function links two modules together, with the resulting
// 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 LinkModules(Module *Dest, const Module *Src, string *ErrorMsg) {
+bool
+Linker::LinkModules(Module *Dest, Module *Src, std::string *ErrorMsg) {
+ assert(Dest != 0 && "Invalid Destination module");
+ assert(Src != 0 && "Invalid Source Module");
+
+ if (Dest->getEndianness() == Module::AnyEndianness)
+ Dest->setEndianness(Src->getEndianness());
+ if (Dest->getPointerSize() == Module::AnyPointerSize)
+ Dest->setPointerSize(Src->getPointerSize());
+ if (Dest->getTargetTriple().empty())
+ Dest->setTargetTriple(Src->getTargetTriple());
+
+ if (Src->getEndianness() != Module::AnyEndianness &&
+ Dest->getEndianness() != Src->getEndianness())
+ std::cerr << "WARNING: Linking two modules of different endianness!\n";
+ if (Src->getPointerSize() != Module::AnyPointerSize &&
+ Dest->getPointerSize() != Src->getPointerSize())
+ std::cerr << "WARNING: Linking two modules of different pointer size!\n";
+ if (!Src->getTargetTriple().empty() &&
+ Dest->getTargetTriple() != Src->getTargetTriple())
+ std::cerr << "WARNING: Linking two modules of different target triples!\n";
+
+ if (!Src->getModuleInlineAsm().empty()) {
+ if (Dest->getModuleInlineAsm().empty())
+ Dest->setModuleInlineAsm(Src->getModuleInlineAsm());
+ else
+ 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.
+ Module::lib_iterator SI = Src->lib_begin();
+ Module::lib_iterator SE = Src->lib_end();
+ while ( SI != SE ) {
+ Dest->addLibrary(*SI);
+ ++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)) return true;
// ValueMap - Mapping of values from what they used to be in Src, to what they
// are now in Dest.
- //
- map<const Value*, Value*> ValueMap;
+ std::map<const Value*, Value*> ValueMap;
+
+ // AppendingVars - Keep track of global variables in the destination module
+ // with appending linkage. After the module is linked together, they are
+ // appended and the module is rewritten.
+ std::multimap<std::string, GlobalVariable *> AppendingVars;
- // Insert all of the globals in src into the Dest module... without
- // initializers
- if (LinkGlobals(Dest, Src, ValueMap, ErrorMsg)) return true;
+ // GlobalsByName - The LLVM SymbolTable class fights our best efforts at
+ // linking by separating globals by type. Until PR411 is fixed, we replicate
+ // it's functionality here.
+ std::map<std::string, GlobalValue*> GlobalsByName;
+
+ for (Module::global_iterator I = Dest->global_begin(), E = Dest->global_end();
+ I != E; ++I) {
+ // Add all of the appending globals already in the Dest module to
+ // AppendingVars.
+ if (I->hasAppendingLinkage())
+ AppendingVars.insert(std::make_pair(I->getName(), I));
+
+ // Keep track of all globals by name.
+ if (!I->hasInternalLinkage() && I->hasName())
+ GlobalsByName[I->getName()] = I;
+ }
+
+ // Keep track of all globals by name.
+ for (Module::iterator I = Dest->begin(), E = Dest->end(); I != E; ++I)
+ if (!I->hasInternalLinkage() && I->hasName())
+ GlobalsByName[I->getName()] = I;
+
+ // 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, GlobalsByName, ErrorMsg))
+ return true;
// Link the functions together between the two modules, without doing function
// bodies... this just adds external function prototypes to the Dest
// 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.
- //
- if (LinkFunctionProtos(Dest, Src, ValueMap, ErrorMsg)) return true;
+ if (LinkFunctionProtos(Dest, Src, ValueMap, GlobalsByName, ErrorMsg))
+ return true;
// Update the initializers in the Dest module now that all globals that may
// be referenced are in Dest.
- //
if (LinkGlobalInits(Dest, Src, ValueMap, ErrorMsg)) return true;
// Link in the function bodies that are defined in the source module into the
// DestModule. This consists basically of copying the function over and
// fixing up references to values.
- //
if (LinkFunctionBodies(Dest, Src, ValueMap, ErrorMsg)) return true;
+ // If there were any appending global variables, link them together now.
+ if (LinkAppendingVars(Dest, AppendingVars, ErrorMsg)) return true;
+
+ // 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.
+ sys::Path modId;
+ modId.set(Src->getModuleIdentifier());
+ if (!modId.isEmpty())
+ Dest->removeLibrary(modId.getBasename());
+
return false;
}
+// vim: sw=2
projects / oota-llvm.git / blobdiff