-//===- Linker.cpp - Module Linker Implementation --------------------------===//
+//===- lib/Linker/LinkModules.cpp - Module Linker Implementation ----------===//
//
// The LLVM Compiler Infrastructure
//
//
//===----------------------------------------------------------------------===//
-#include "llvm/Support/Linker.h"
+#include "llvm/Linker.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/SymbolTable.h"
#include "llvm/Instructions.h"
#include "llvm/Assembly/Writer.h"
+#include "llvm/System/Path.h"
#include <iostream>
-
+#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;
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()
//
// 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,
// 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;
// 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();
}
-// 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...
-//
+// 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*> &LocalMap,
- std::map<const Value*, Value*> *GlobalMap) {
- std::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;
- }
+ 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.
if (const Constant *CPV = dyn_cast<Constant>(In)) {
if ((!isa<DerivedType>(CPV->getType()) && !isa<ConstantExpr>(CPV)) ||
isa<ConstantAggregateZero>(CPV))
- return const_cast<Constant*>(CPV); // Simple constants stay identical...
+ return const_cast<Constant*>(CPV); // Simple constants stay identical.
Constant *Result = 0;
if (const ConstantArray *CPA = dyn_cast<ConstantArray>(CPV)) {
std::vector<Constant*> Operands(CPA->getNumOperands());
for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
- Operands[i] =
- cast<Constant>(RemapOperand(CPA->getOperand(i), LocalMap, GlobalMap));
+ 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)) {
std::vector<Constant*> Operands(CPS->getNumOperands());
for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
- Operands[i] =
- cast<Constant>(RemapOperand(CPS->getOperand(i), LocalMap, GlobalMap));
+ 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 (isa<GlobalValue>(CPV)) {
- Result = cast<Constant>(RemapOperand(CPV, LocalMap, GlobalMap));
+ Result = cast<Constant>(RemapOperand(CPV, ValueMap));
} else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
if (CE->getOpcode() == Instruction::GetElementPtr) {
- Value *Ptr = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap);
+ 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->getNumOperands() == 1) {
// Cast instruction
assert(CE->getOpcode() == Instruction::Cast);
- Value *V = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap);
+ 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), LocalMap, GlobalMap);
- Value *V2 = RemapOperand(CE->getOperand(1), LocalMap, GlobalMap);
- Value *V3 = RemapOperand(CE->getOperand(2), LocalMap, GlobalMap);
+ 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), LocalMap, GlobalMap);
- Value *V2 = RemapOperand(CE->getOperand(1), LocalMap, GlobalMap);
+ Value *V1 = RemapOperand(CE->getOperand(0), ValueMap);
+ Value *V2 = RemapOperand(CE->getOperand(1), ValueMap);
Result = ConstantExpr::get(CE->getOpcode(), cast<Constant>(V1),
cast<Constant>(V2));
}
// Cache the mapping in our local map structure...
- if (GlobalMap)
- GlobalMap->insert(std::make_pair(In, Result));
- else
- LocalMap.insert(std::make_pair(In, Result));
+ ValueMap.insert(std::make_pair(In, Result));
return Result;
}
- std::cerr << "XXX LocalMap: \n";
- PrintMap(LocalMap);
-
- if (GlobalMap) {
- std::cerr << "XXX GlobalMap: \n";
- PrintMap(*GlobalMap);
- }
+ std::cerr << "LinkModules ValueMap: \n";
+ PrintMap(ValueMap);
std::cerr << "Couldn't remap value: " << (void*)In << " " << *In << "\n";
assert(0 && "Couldn't remap value!");
// 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,
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;
GlobalVariable *DGV = 0;
// Check to see if may have to link the global.
- if (SGV->hasName() && !SGV->hasInternalLinkage()) {
- std::map<std::string, GlobalValue*>::iterator EGV =
- 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 (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 && RecursiveResolveTypes(SGV->getType(), DGV->getType(),ST, ""))
+ DGV = 0; // FIXME: gross.
+ }
assert(SGV->hasInitializer() || SGV->hasExternalLinkage() &&
"Global must either be external or have an initializer!");
// 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,
// 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!");
+ "' with 'weak' and 'appending' linkage is not allowed!");
if (SGV->isConstant() != DGV->isConstant())
return Error(Err, "Global Variable Collision on '" +
- SGV->getType()->getDescription() + " %" + SGV->getName() +
+ ToStr(SGV->getType(), Src) + " %" + SGV->getName() +
"' - Global variables differ in const'ness");
// Otherwise, just perform the link.
if (SGV->isConstant() != DGV->isConstant())
return Error(Err, "Global Variable Collision on '" +
- SGV->getType()->getDescription() + " %" + SGV->getName() +
+ ToStr(SGV->getType(), Src) + " %" + SGV->getName() +
"' - Global variables differ in const'ness");
if (!SGV->hasLinkOnceLinkage())
} 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 '" +
- SGV->getType()->getDescription() + " %" + SGV->getName() +
+ ToStr(SGV->getType(), Src) + " %" + SGV->getName() +
"' - Global variables differ in const'ness");
if (SGV->getInitializer() != DGV->getInitializer())
return Error(Err, "Global Variable Collision on '" +
- SGV->getType()->getDescription() + " %" + SGV->getName() +
+ ToStr(SGV->getType(), Src) + " %" + SGV->getName() +
"' - External linkage globals have different initializers");
ValueMap.insert(std::make_pair(SGV, DGV));
// 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){
const GlobalVariable *SGV = I;
if (SGV->hasInitializer()) { // Only process initialized GV's
// Figure out what the initializer looks like in the dest module...
Constant *SInit =
- cast<Constant>(RemapOperand(SGV->getInitializer(), ValueMap, 0));
+ cast<Constant>(RemapOperand(SGV->getInitializer(), ValueMap));
GlobalVariable *DGV = cast<GlobalVariable>(ValueMap[SGV]);
if (DGV->hasInitializer()) {
if (SGV->hasExternalLinkage()) {
if (DGV->getInitializer() != SInit)
return Error(Err, "Global Variable Collision on '" +
- SGV->getType()->getDescription() +"':%"+SGV->getName()+
+ 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
// 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;
if (SF->hasName() && !SF->hasInternalLinkage()) {
// Check to see if may have to link the function.
- 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 = 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()) {
} else if (SF->hasExternalLinkage()) {
// The function is defined in both modules!!
return Error(Err, "Function '" +
- SF->getFunctionType()->getDescription() + "':\"" +
+ 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, const Function *Src,
+static bool LinkFunctionBody(Function *Dest, Function *Src,
std::map<const Value*, Value*> &GlobalMap,
std::string *Err) {
assert(Src && Dest && Dest->isExternal() && !Src->isExternal());
- std::map<const Value*, Value*> LocalMap; // Map for function local values
- // Go through and convert function arguments over...
+ // Go through and convert function arguments over, remembering the mapping.
Function::aiterator DI = Dest->abegin();
- for (Function::const_aiterator I = Src->abegin(), E = Src->aend();
+ for (Function::aiterator I = Src->abegin(), E = Src->aend();
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, DI));
+ 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::aiterator I = Src->abegin(), E = Src->aend(); 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,
+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
// 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) {
// 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...
// 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, const Module *Src, std::string *ErrorMsg) {
+bool llvm::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->getPointerSize() != Src->getPointerSize())
std::cerr << "WARNING: Linking two modules of different pointer size!\n";
+ // 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.
- //
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
// 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());
+ if (!modId.isEmpty())
+ Dest->removeLibrary(modId.getBasename());
+
return false;
}
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