//===- 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.
// 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;
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);
// 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,
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;
return false;
}
case Type::StructTyID: {
- if (getST(DestTy)->getNumContainedTypes() !=
+ 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),
// 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;
return Result;
}
default: assert(0 && "Unexpected type!"); return true;
- }
+ }
}
static bool RecursiveResolveTypes(const PATypeHolder &DestTy,
// 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, std::string *Err) {
SymbolTable *DestST = &Dest->getSymbolTable();
const SymbolTable *SrcST = &Src->getSymbolTable();
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.
- // Report the warning and delete one of the names.
if (DelayedTypesToResolve.size() == OldSize) {
- const std::string &Name = DelayedTypesToResolve.back();
-
- const Type *T1 = SrcST->lookupType(Name);
- const Type *T2 = DestST->lookupType(Name);
- std::cerr << "WARNING: Type conflict between types named '" << Name
- << "'.\n Src='";
- WriteTypeSymbolic(std::cerr, T1, Src);
- std::cerr << "'.\n Dest='";
- WriteTypeSymbolic(std::cerr, T2, Dest);
- std::cerr << "'\n";
-
// Remove the symbol name from the destination.
DelayedTypesToResolve.pop_back();
}
// 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);
"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,
+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,
// We will need a module level symbol table if the src module has a module
// level symbol table...
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;
+ 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())
GlobalsByName.find(SGV->getName());
if (EGV != GlobalsByName.end())
DGV = dyn_cast<GlobalVariable>(EGV->second);
- if (DGV && RecursiveResolveTypes(SGV->getType(), DGV->getType(),ST, ""))
- DGV = 0; // FIXME: gross.
+ 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!");
- bool SGExtern = SGV->isExternal();
- bool DGExtern = DGV ? DGV->isExternal() : false;
+ GlobalValue::LinkageTypes NewLinkage;
+ bool LinkFromSrc;
+ if (GetLinkageResult(DGV, SGV, NewLinkage, LinkFromSrc, Err))
+ return true;
- if (!DGV || DGV->hasInternalLinkage() || SGV->hasInternalLinkage()) {
+ 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 *NewDGV =
new GlobalVariable(SGV->getType()->getElementType(),
SGV->isConstant(), SGV->getLinkage(), /*init*/0,
if (SGV->hasAppendingLinkage())
// Keep track that this is an appending variable...
AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV));
-
- } else if (SGV->isExternal()) {
- // If SGV is external or if both SGV & DGV are external.. Just link the
- // external globals, we aren't adding anything.
- ValueMap.insert(std::make_pair(SGV, DGV));
-
- // Inherit 'const' information.
- if (SGV->isConstant()) DGV->setConstant(true);
-
- } else if (DGV->isExternal()) { // If DGV is external but SGV is not...
- ValueMap.insert(std::make_pair(SGV, DGV));
- DGV->setLinkage(SGV->getLinkage()); // Inherit linkage!
-
- if (DGV->isConstant() && !SGV->isConstant())
- return Error(Err, "Linking globals named '" + SGV->getName() +
- "': declaration is const but definition is not!");
-
- // Inherit 'const' information.
- if (SGV->isConstant()) DGV->setConstant(true);
-
- } else if (SGV->hasWeakLinkage() || SGV->hasLinkOnceLinkage()) {
- // At this point we know that DGV has LinkOnce, Appending, Weak, or
- // External linkage. If DGV is Appending, this is an error.
- if (DGV->hasAppendingLinkage())
- return Error(Err, "Linking globals named '" + SGV->getName() +
- "' with 'weak' and 'appending' linkage is not allowed!");
-
- if (SGV->isConstant() != DGV->isConstant())
- return Error(Err, "Global Variable Collision on '" +
- ToStr(SGV->getType(), Src) + " %" + SGV->getName() +
- "' - Global variables differ in const'ness");
-
- // Otherwise, just perform the link.
- ValueMap.insert(std::make_pair(SGV, DGV));
-
- // Linkonce+Weak = Weak
- if (DGV->hasLinkOnceLinkage() && SGV->hasWeakLinkage())
- DGV->setLinkage(SGV->getLinkage());
-
- } else if (DGV->hasWeakLinkage() || DGV->hasLinkOnceLinkage()) {
- // At this point we know that SGV has LinkOnce, Appending, or External
- // linkage. If SGV is Appending, this is an error.
- if (SGV->hasAppendingLinkage())
- return Error(Err, "Linking globals named '" + SGV->getName() +
- " ' with 'weak' and 'appending' linkage is not allowed!");
-
- if (SGV->isConstant() != DGV->isConstant())
- return Error(Err, "Global Variable Collision on '" +
- ToStr(SGV->getType(), Src) + " %" + SGV->getName() +
- "' - Global variables differ in const'ness");
-
- if (!SGV->hasLinkOnceLinkage())
- DGV->setLinkage(SGV->getLinkage()); // Inherit linkage!
- ValueMap.insert(std::make_pair(SGV, DGV));
-
- } else if (SGV->getLinkage() != DGV->getLinkage()) {
- return Error(Err, "Global variables named '" + SGV->getName() +
- "' have different linkage specifiers!");
- // Inherit 'const' information.
- if (SGV->isConstant()) DGV->setConstant(true);
-
- } else if (SGV->hasExternalLinkage()) {
- // Allow linking two exactly identical external global variables...
- if (SGV->isConstant() != DGV->isConstant())
- return Error(Err, "Global Variable Collision on '" +
- ToStr(SGV->getType(), Src) + " %" + SGV->getName() +
- "' - Global variables differ in const'ness");
-
- if (SGV->getInitializer() != DGV->getInitializer())
- return Error(Err, "Global Variable Collision on '" +
- ToStr(SGV->getType(), Src) + " %" + SGV->getName() +
- "' - External linkage globals have different initializers");
-
- ValueMap.insert(std::make_pair(SGV, DGV));
- } else if (SGV->hasAppendingLinkage()) {
+ } 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
// Keep track that this is an appending variable...
AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV));
} else {
- assert(0 && "Unknown linkage!");
+ // 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());
+ 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,
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
Constant *SInit =
cast<Constant>(RemapOperand(SGV->getInitializer(), ValueMap));
- GlobalVariable *DGV = cast<GlobalVariable>(ValueMap[SGV]);
+ GlobalVariable *DGV = cast<GlobalVariable>(ValueMap[SGV]);
if (DGV->hasInitializer()) {
if (SGV->hasExternalLinkage()) {
if (DGV->getInitializer() != SInit)
- return Error(Err, "Global Variable Collision on '" +
+ return Error(Err, "Global Variable Collision on '" +
ToStr(SGV->getType(), Src) +"':%"+SGV->getName()+
" - Global variables have different initializers");
} else if (DGV->hasLinkOnceLinkage() || DGV->hasWeakLinkage()) {
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
Function *DF = 0;
// identical to SF into the dest module...
Function *NewDF = new Function(SF->getFunctionType(), SF->getLinkage(),
SF->getName(), Dest);
+ NewDF->setCallingConv(SF->getCallingConv());
// If the LLVM runtime renamed the function, but it is an externally
// visible symbol, DF must be an existing function with internal linkage.
"' have different linkage specifiers!");
} else if (SF->hasExternalLinkage()) {
// The function is defined in both modules!!
- return Error(Err, "Function '" +
- ToStr(SF->getFunctionType(), Src) + "':\"" +
+ return Error(Err, "Function '" +
+ ToStr(SF->getFunctionType(), Src) + "':\"" +
SF->getName() + "\" - Function is already defined!");
} else {
assert(0 && "Unknown linkage configuration found!");
// 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, Function *Src,
std::map<const Value*, Value*> &GlobalMap,
std::string *Err) {
assert(Src && Dest && Dest->isExternal() && !Src->isExternal());
// Go through and convert function arguments over, remembering the mapping.
- Function::aiterator DI = Dest->abegin();
- for (Function::aiterator I = Src->abegin(), E = Src->aend();
+ 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...
*OI = RemapOperand(*OI, GlobalMap);
// There is no need to map the arguments anymore.
- for (Function::aiterator I = Src->abegin(), E = Src->aend(); I != E; ++I)
+ 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, 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::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
// 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...
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,
// 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 llvm::LinkModules(Module *Dest, Module *Src, std::string *ErrorMsg) {
+bool
+Linker::LinkModules(Module *Dest, Module *Src, std::string *ErrorMsg) {
assert(Dest != 0 && "Invalid Destination module");
assert(Src != 0 && "Invalid Source Module");
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())
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";
- // Update the destination module's dependent libraries list with the libraries
+ // 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();
// 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.
- //
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;
// GlobalsByName - The LLVM SymbolTable class fights our best efforts at
// it's functionality here.
std::map<std::string, GlobalValue*> GlobalsByName;
- for (Module::giterator I = Dest->gbegin(), E = Dest->gend(); I != E; ++I) {
+ 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())
// 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;
// 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, 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.setFile(Src->getModuleIdentifier());
+ modId.set(Src->getModuleIdentifier());
if (!modId.isEmpty())
Dest->removeLibrary(modId.getBasename());
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