LinkModules.cpp revision 4c00e53b81de81ecf4ba0c4e287ea230c79e82ae
152f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner//===- Linker.cpp - Module Linker Implementation --------------------------===// 252f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// 352f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// This file implements the LLVM module linker. 452f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// 552f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// Specifically, this: 68d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// * Merges global variables between the two modules 78d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// * Uninit + Uninit = Init, Init + Uninit = Init, Init + Init = Error if != 8c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// * Merges functions between two modules 952f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// 1052f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner//===----------------------------------------------------------------------===// 1152f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 12c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner#include "llvm/Transforms/Utils/Linker.h" 135c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner#include "llvm/Module.h" 145c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner#include "llvm/SymbolTable.h" 155c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner#include "llvm/DerivedTypes.h" 165c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner#include "llvm/iOther.h" 1731bcdb822fe9133b1973de51519d34e5813a6184Chris Lattner#include "llvm/Constants.h" 185c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 195c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// Error - Simple wrapper function to conditionally assign to E and return true. 205c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// This just makes error return conditions a little bit simpler... 215c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 228166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattnerstatic inline bool Error(std::string *E, const std::string &Message) { 235c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner if (E) *E = Message; 245c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return true; 255c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 265c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 274c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner// ResolveTypes - Attempt to link the two specified types together. Return true 284c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner// if there is an error and they cannot yet be linked. 294c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner// 304c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattnerstatic bool ResolveTypes(Type *DestTy, Type *SrcTy, SymbolTable *DestST, 314c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner const std::string &Name) { 324c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Does the type already exist in the module? 334c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (DestTy && !isa<OpaqueType>(DestTy)) { // Yup, the type already exists... 344c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (DestTy == SrcTy) return false; // If already equal, noop 354c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (OpaqueType *OT = dyn_cast<OpaqueType>(SrcTy)) { 364c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner OT->refineAbstractTypeTo(DestTy); 374c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } else { 384c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner return true; // Cannot link types... neither is opaque and not-equal 394c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 404c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } else { // Type not in dest module. Add it now. 414c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (DestTy) // Type _is_ in module, just opaque... 424c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner cast<OpaqueType>(DestTy)->refineAbstractTypeTo(SrcTy); 434c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner else 444c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner DestST->insert(Name, SrcTy); 454c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 464c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner return false; 474c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner} 484c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 492c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// LinkTypes - Go through the symbol table of the Src module and see if any 502c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// types are named in the src module that are not named in the Dst module. 512c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// Make sure there are no type name conflicts. 522c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// 535c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic bool LinkTypes(Module *Dest, const Module *Src, std::string *Err) { 546e6026b46569b01f8f6d4dcdb6c899c3a9c76b3eChris Lattner SymbolTable *DestST = &Dest->getSymbolTable(); 556e6026b46569b01f8f6d4dcdb6c899c3a9c76b3eChris Lattner const SymbolTable *SrcST = &Src->getSymbolTable(); 562c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 572c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Look for a type plane for Type's... 582c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner SymbolTable::const_iterator PI = SrcST->find(Type::TypeTy); 592c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner if (PI == SrcST->end()) return false; // No named types, do nothing. 602c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 614c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Some types cannot be resolved immediately becuse they depend on other types 624c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // being resolved to each other first. This contains a list of types we are 634c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // waiting to recheck. 644c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner std::vector<std::string> DelayedTypesToResolve; 654c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 662c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner const SymbolTable::VarMap &VM = PI->second; 672c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner for (SymbolTable::type_const_iterator I = VM.begin(), E = VM.end(); 682c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner I != E; ++I) { 695c2d335d86579941b71816196a95a64b277e8963Chris Lattner const std::string &Name = I->first; 704c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner Type *RHS = cast<Type>(I->second); 712c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 722c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Check to see if this type name is already in the dest module... 734c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner Type *Entry = cast_or_null<Type>(DestST->lookup(Type::TypeTy, Name)); 744c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 754c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (ResolveTypes(Entry, RHS, DestST, Name)) { 764c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // They look different, save the types 'till later to resolve. 774c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner DelayedTypesToResolve.push_back(Name); 784c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 794c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 804c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 814c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Iteratively resolve types while we can... 824c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner while (!DelayedTypesToResolve.empty()) { 834c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Loop over all of the types, attempting to resolve them if possible... 844c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner unsigned OldSize = DelayedTypesToResolve.size(); 854c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 864c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner for (unsigned i = 0; i != DelayedTypesToResolve.size(); ++i) { 874c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner const std::string &Name = DelayedTypesToResolve[i]; 884c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner Type *T1 = cast<Type>(VM.find(Name)->second); 894c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner Type *T2 = cast<Type>(DestST->lookup(Type::TypeTy, Name)); 904c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (!ResolveTypes(T2, T1, DestST, Name)) { 914c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // We are making progress! 924c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i); 934c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner --i; 942f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner } 954c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 962f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner 974c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Did we not eliminate any types? 984c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (DelayedTypesToResolve.size() == OldSize) { 994c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Build up an error message of all of the mismatched types. 1004c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner std::string ErrorMessage; 1014c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner for (unsigned i = 0, e = DelayedTypesToResolve.size(); i != e; ++i) { 1024c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner const std::string &Name = DelayedTypesToResolve[i]; 1034c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner const Type *T1 = cast<Type>(VM.find(Name)->second); 1044c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner const Type *T2 = cast<Type>(DestST->lookup(Type::TypeTy, Name)); 1054c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner ErrorMessage += " Type named '" + Name + 1064c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner "' conflicts.\n Src='" + T1->getDescription() + 1074c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner "'.\n Dest='" + T2->getDescription() + "'\n"; 1084c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 1094c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner return Error(Err, "Type conflict between types in modules:\n" + 1104c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner ErrorMessage); 1112c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner } 1122c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner } 1134c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 1144c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 1152c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner return false; 1162c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner} 1172c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 1185c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic void PrintMap(const std::map<const Value*, Value*> &M) { 1195c2d335d86579941b71816196a95a64b277e8963Chris Lattner for (std::map<const Value*, Value*>::const_iterator I = M.begin(), E =M.end(); 1202d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner I != E; ++I) { 1215c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << " Fr: " << (void*)I->first << " "; 12287182ae6baf28ca6da6ee4bc00cf1857f293acfeChris Lattner I->first->dump(); 1235c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << " To: " << (void*)I->second << " "; 12487182ae6baf28ca6da6ee4bc00cf1857f293acfeChris Lattner I->second->dump(); 1255c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << "\n"; 1262d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner } 1272d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner} 1282d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 1292d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 1305c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// RemapOperand - Use LocalMap and GlobalMap to convert references from one 1315c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// module to another. This is somewhat sophisticated in that it can 1325c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// automatically handle constant references correctly as well... 1335c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 1345c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic Value *RemapOperand(const Value *In, 1355c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &LocalMap, 1365c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> *GlobalMap) { 1375c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*,Value*>::const_iterator I = LocalMap.find(In); 1385c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner if (I != LocalMap.end()) return I->second; 1395c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 1405c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner if (GlobalMap) { 1415c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner I = GlobalMap->find(In); 1425c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner if (I != GlobalMap->end()) return I->second; 1435c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 1445c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 1458d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Check to see if it's a constant that we are interesting in transforming... 14618961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (const Constant *CPV = dyn_cast<Constant>(In)) { 1476cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner if (!isa<DerivedType>(CPV->getType()) && !isa<ConstantExpr>(CPV)) 14818961504fc2b299578dba817900a0696cf3ccc4dChris Lattner return const_cast<Constant*>(CPV); // Simple constants stay identical... 1498d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 150e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Constant *Result = 0; 1518d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 15218961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (const ConstantArray *CPA = dyn_cast<ConstantArray>(CPV)) { 153697954c15da58bd8b186dbafdedd8b06db770201Chris Lattner const std::vector<Use> &Ops = CPA->getValues(); 154697954c15da58bd8b186dbafdedd8b06db770201Chris Lattner std::vector<Constant*> Operands(Ops.size()); 155e306d94782b1c608857738279852dcc050c66004Chris Lattner for (unsigned i = 0, e = Ops.size(); i != e; ++i) 1568d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner Operands[i] = 157e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner cast<Constant>(RemapOperand(Ops[i], LocalMap, GlobalMap)); 158e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Result = ConstantArray::get(cast<ArrayType>(CPA->getType()), Operands); 15918961504fc2b299578dba817900a0696cf3ccc4dChris Lattner } else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(CPV)) { 160697954c15da58bd8b186dbafdedd8b06db770201Chris Lattner const std::vector<Use> &Ops = CPS->getValues(); 161697954c15da58bd8b186dbafdedd8b06db770201Chris Lattner std::vector<Constant*> Operands(Ops.size()); 1628d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner for (unsigned i = 0; i < Ops.size(); ++i) 1638d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner Operands[i] = 164e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner cast<Constant>(RemapOperand(Ops[i], LocalMap, GlobalMap)); 165e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Result = ConstantStruct::get(cast<StructType>(CPS->getType()), Operands); 166e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner } else if (isa<ConstantPointerNull>(CPV)) { 16718961504fc2b299578dba817900a0696cf3ccc4dChris Lattner Result = const_cast<Constant*>(CPV); 16818961504fc2b299578dba817900a0696cf3ccc4dChris Lattner } else if (const ConstantPointerRef *CPR = 16918961504fc2b299578dba817900a0696cf3ccc4dChris Lattner dyn_cast<ConstantPointerRef>(CPV)) { 1708d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner Value *V = RemapOperand(CPR->getValue(), LocalMap, GlobalMap); 171e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Result = ConstantPointerRef::get(cast<GlobalValue>(V)); 1726cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) { 173b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner if (CE->getOpcode() == Instruction::GetElementPtr) { 174b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner Value *Ptr = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap); 175b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner std::vector<Constant*> Indices; 176b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner Indices.reserve(CE->getNumOperands()-1); 177b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i) 178b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner Indices.push_back(cast<Constant>(RemapOperand(CE->getOperand(i), 179b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner LocalMap, GlobalMap))); 180b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner 181b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner Result = ConstantExpr::getGetElementPtr(cast<Constant>(Ptr), Indices); 182b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner } else if (CE->getNumOperands() == 1) { 183ad333484ea5ae976b83e35ccd3f6cfa6e71290e2Chris Lattner // Cast instruction 184ad333484ea5ae976b83e35ccd3f6cfa6e71290e2Chris Lattner assert(CE->getOpcode() == Instruction::Cast); 1856cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner Value *V = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap); 186ad333484ea5ae976b83e35ccd3f6cfa6e71290e2Chris Lattner Result = ConstantExpr::getCast(cast<Constant>(V), CE->getType()); 1876cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } else if (CE->getNumOperands() == 2) { 1886cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // Binary operator... 1896cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner Value *V1 = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap); 1906cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner Value *V2 = RemapOperand(CE->getOperand(1), LocalMap, GlobalMap); 1916cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner 1926cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner Result = ConstantExpr::get(CE->getOpcode(), cast<Constant>(V1), 193e8e4605021141d689493132a9c7c6fce6294937fChris Lattner cast<Constant>(V2)); 1946cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } else { 195b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner assert(0 && "Unknown constant expr type!"); 1966cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } 1976cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner 1988d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } else { 1998d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner assert(0 && "Unknown type of derived type constant value!"); 2008d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 2018d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 2028d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Cache the mapping in our local map structure... 203d149c053cdbb406b7b5dff24127b4c509420893eChris Lattner if (GlobalMap) 204d149c053cdbb406b7b5dff24127b4c509420893eChris Lattner GlobalMap->insert(std::make_pair(In, Result)); 205d149c053cdbb406b7b5dff24127b4c509420893eChris Lattner else 206d149c053cdbb406b7b5dff24127b4c509420893eChris Lattner LocalMap.insert(std::make_pair(In, Result)); 2078d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return Result; 2088d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 2092d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 2105c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << "XXX LocalMap: \n"; 2112d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner PrintMap(LocalMap); 2122d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 2132d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner if (GlobalMap) { 2145c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << "XXX GlobalMap: \n"; 2152d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner PrintMap(*GlobalMap); 2162d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner } 2172d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 2185c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << "Couldn't remap value: " << (void*)In << " " << *In << "\n"; 2198d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner assert(0 && "Couldn't remap value!"); 2208d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return 0; 2215c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 2225c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 2235c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 2245c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// LinkGlobals - Loop through the global variables in the src module and merge 2258166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// them into the dest module. 2265c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 2275c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattnerstatic bool LinkGlobals(Module *Dest, const Module *Src, 2285c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 2298166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 2305c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 2315c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // We will need a module level symbol table if the src module has a module 2325c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // level symbol table... 233b91b657e026e86082b665cc875c2881ed075b68dChris Lattner SymbolTable *ST = (SymbolTable*)&Dest->getSymbolTable(); 2345c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 2355c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 2365c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 2375c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner for (Module::const_giterator I = Src->gbegin(), E = Src->gend(); I != E; ++I){ 23818961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const GlobalVariable *SGV = I; 2394ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner GlobalVariable *DGV = 0; 2404ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (SGV->hasName()) { 2414ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // A same named thing is a global variable, because the only two things 24279df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner // that may be in a module level symbol table are Global Vars and 24379df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner // Functions, and they both have distinct, nonoverlapping, possible types. 2445c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 2454ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner DGV = cast_or_null<GlobalVariable>(ST->lookup(SGV->getType(), 2464ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner SGV->getName())); 2474ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } 2485c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 2494ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(SGV->hasInitializer() || SGV->hasExternalLinkage() && 2504ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner "Global must either be external or have an initializer!"); 2515c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 2520fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner bool SGExtern = SGV->isExternal(); 2530fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner bool DGExtern = DGV ? DGV->isExternal() : false; 2540fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner 2554ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (!DGV || DGV->hasInternalLinkage() || SGV->hasInternalLinkage()) { 2565c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // No linking to be performed, simply create an identical version of the 2578d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // symbol over in the dest module... the initializer will be filled in 2588d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // later by LinkGlobalInits... 2598d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // 2602719bac90525985f4ebb97324b4c087d47b54384Chris Lattner GlobalVariable *NewDGV = 2612719bac90525985f4ebb97324b4c087d47b54384Chris Lattner new GlobalVariable(SGV->getType()->getElementType(), 2622719bac90525985f4ebb97324b4c087d47b54384Chris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 2632719bac90525985f4ebb97324b4c087d47b54384Chris Lattner SGV->getName(), Dest); 2642719bac90525985f4ebb97324b4c087d47b54384Chris Lattner 2652719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // If the LLVM runtime renamed the global, but it is an externally visible 2662719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // symbol, DGV must be an existing global with internal linkage. Rename 2672719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // it. 2682719bac90525985f4ebb97324b4c087d47b54384Chris Lattner if (NewDGV->getName() != SGV->getName() && !NewDGV->hasInternalLinkage()){ 2692719bac90525985f4ebb97324b4c087d47b54384Chris Lattner assert(DGV && DGV->getName() == SGV->getName() && 2702719bac90525985f4ebb97324b4c087d47b54384Chris Lattner DGV->hasInternalLinkage()); 2712719bac90525985f4ebb97324b4c087d47b54384Chris Lattner DGV->setName(""); 2722719bac90525985f4ebb97324b4c087d47b54384Chris Lattner NewDGV->setName(SGV->getName()); // Force the name back 2732719bac90525985f4ebb97324b4c087d47b54384Chris Lattner DGV->setName(SGV->getName()); // This will cause a renaming 2742719bac90525985f4ebb97324b4c087d47b54384Chris Lattner assert(NewDGV->getName() == SGV->getName() && 2752719bac90525985f4ebb97324b4c087d47b54384Chris Lattner DGV->getName() != SGV->getName()); 2762719bac90525985f4ebb97324b4c087d47b54384Chris Lattner } 2775c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 2785c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Make sure to remember this mapping... 2792719bac90525985f4ebb97324b4c087d47b54384Chris Lattner ValueMap.insert(std::make_pair(SGV, NewDGV)); 2808166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (SGV->hasAppendingLinkage()) 2818166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Keep track that this is an appending variable... 2828166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV)); 2838166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 284c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SGV->isExternal()) { 285c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // If SGV is external or if both SGV & DGV are external.. Just link the 286c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // external globals, we aren't adding anything. 287c2b97d43a074445c6856d69538a95de09450c26eChris Lattner ValueMap.insert(std::make_pair(SGV, DGV)); 288c2b97d43a074445c6856d69538a95de09450c26eChris Lattner 289c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (DGV->isExternal()) { // If DGV is external but SGV is not... 290c2b97d43a074445c6856d69538a95de09450c26eChris Lattner ValueMap.insert(std::make_pair(SGV, DGV)); 291c2b97d43a074445c6856d69538a95de09450c26eChris Lattner DGV->setLinkage(SGV->getLinkage()); // Inherit linkage! 292c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SGV->getLinkage() != DGV->getLinkage()) { 2934ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner return Error(Err, "Global variables named '" + SGV->getName() + 2944ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner "' have different linkage specifiers!"); 295c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SGV->hasExternalLinkage()) { 296c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // Allow linking two exactly identical external global variables... 297c2b97d43a074445c6856d69538a95de09450c26eChris Lattner if (SGV->isConstant() != DGV->isConstant() || 298c2b97d43a074445c6856d69538a95de09450c26eChris Lattner SGV->getInitializer() != DGV->getInitializer()) 299c2b97d43a074445c6856d69538a95de09450c26eChris Lattner return Error(Err, "Global Variable Collision on '" + 300c2b97d43a074445c6856d69538a95de09450c26eChris Lattner SGV->getType()->getDescription() + " %" + SGV->getName() + 301c2b97d43a074445c6856d69538a95de09450c26eChris Lattner "' - Global variables differ in const'ness"); 302c2b97d43a074445c6856d69538a95de09450c26eChris Lattner ValueMap.insert(std::make_pair(SGV, DGV)); 303c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SGV->hasLinkOnceLinkage()) { 3044ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // If the global variable has a name, and that name is already in use in 3054ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // the Dest module, make sure that the name is a compatible global 3064ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // variable... 3074ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // 3084ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // Check to see if the two GV's have the same Const'ness... 3094ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (SGV->isConstant() != DGV->isConstant()) 3104ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner return Error(Err, "Global Variable Collision on '" + 311c2b97d43a074445c6856d69538a95de09450c26eChris Lattner SGV->getType()->getDescription() + " %" + SGV->getName() + 312c2b97d43a074445c6856d69538a95de09450c26eChris Lattner "' - Global variables differ in const'ness"); 3130fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner 3144ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // Okay, everything is cool, remember the mapping... 3154ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner ValueMap.insert(std::make_pair(SGV, DGV)); 316c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SGV->hasAppendingLinkage()) { 3178166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // No linking is performed yet. Just insert a new copy of the global, and 3188166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // keep track of the fact that it is an appending variable in the 3198166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars map. The name is cleared out so that no linkage is 3208166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // performed. 3218166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NewDGV = 3228166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner new GlobalVariable(SGV->getType()->getElementType(), 3238166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 3248166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "", Dest); 3258166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 3268166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Make sure to remember this mapping... 3278166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner ValueMap.insert(std::make_pair(SGV, NewDGV)); 3288166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 3298166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Keep track that this is an appending variable... 3308166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV)); 3314ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else { 3324ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(0 && "Unknown linkage!"); 3335c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 3345c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 3355c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 3365c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 3375c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 3385c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 3398d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// LinkGlobalInits - Update the initializers in the Dest module now that all 3408d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// globals that may be referenced are in Dest. 3418d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// 3428d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattnerstatic bool LinkGlobalInits(Module *Dest, const Module *Src, 3435c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 3445c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 3458d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 3468d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 3478d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // 3488d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner for (Module::const_giterator I = Src->gbegin(), E = Src->gend(); I != E; ++I){ 34918961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const GlobalVariable *SGV = I; 3508d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 3518d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner if (SGV->hasInitializer()) { // Only process initialized GV's 3528d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Figure out what the initializer looks like in the dest module... 3534ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner Constant *SInit = 3542f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner cast<Constant>(RemapOperand(SGV->getInitializer(), ValueMap, 0)); 3558d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 3568d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner GlobalVariable *DGV = cast<GlobalVariable>(ValueMap[SGV]); 3574ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (DGV->hasInitializer()) { 3584ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(SGV->getLinkage() == DGV->getLinkage()); 3594ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (SGV->hasExternalLinkage()) { 3604ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (DGV->getInitializer() != SInit) 3614ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner return Error(Err, "Global Variable Collision on '" + 3624ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner SGV->getType()->getDescription() +"':%"+SGV->getName()+ 3634ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner " - Global variables have different initializers"); 3644ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else if (DGV->hasLinkOnceLinkage()) { 3654ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // Nothing is required, mapped values will take the new global 3664ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // automatically. 3674ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else if (DGV->hasAppendingLinkage()) { 3684ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(0 && "Appending linkage unimplemented!"); 3694ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else { 3704ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(0 && "Unknown linkage!"); 3714ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } 3728d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } else { 3738d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Copy the initializer over now... 3744ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner DGV->setInitializer(SInit); 3758d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 3768d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 3778d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 3788d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return false; 3798d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner} 3805c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 38179df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner// LinkFunctionProtos - Link the functions together between the two modules, 382c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// without doing function bodies... this just adds external function prototypes 383c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// to the Dest function... 3845c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 38579df7c0aaa18129e55968c8783ef8346807bd4afChris Lattnerstatic bool LinkFunctionProtos(Module *Dest, const Module *Src, 3865c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 3875c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 388b91b657e026e86082b665cc875c2881ed075b68dChris Lattner SymbolTable *ST = (SymbolTable*)&Dest->getSymbolTable(); 3895c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 390c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Loop over all of the functions in the src module, mapping them over as we 391c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // go 3925c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 3935c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner for (Module::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) { 39418961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const Function *SF = I; // SrcFunction 3954ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner Function *DF = 0; 3964ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (SF->hasName()) 39779df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner // The same named thing is a Function, because the only two things 39879df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner // that may be in a module level symbol table are Global Vars and 39979df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner // Functions, and they both have distinct, nonoverlapping, possible types. 4005c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 4014ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner DF = cast_or_null<Function>(ST->lookup(SF->getType(), SF->getName())); 4025c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4034ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (!DF || SF->hasInternalLinkage() || DF->hasInternalLinkage()) { 4040fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner // Function does not already exist, simply insert an function signature 4050fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner // identical to SF into the dest module... 4062719bac90525985f4ebb97324b4c087d47b54384Chris Lattner Function *NewDF = new Function(SF->getFunctionType(), SF->getLinkage(), 4072719bac90525985f4ebb97324b4c087d47b54384Chris Lattner SF->getName(), Dest); 4082719bac90525985f4ebb97324b4c087d47b54384Chris Lattner 4092719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // If the LLVM runtime renamed the function, but it is an externally 4102719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // visible symbol, DF must be an existing function with internal linkage. 4112719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // Rename it. 4122719bac90525985f4ebb97324b4c087d47b54384Chris Lattner if (NewDF->getName() != SF->getName() && !NewDF->hasInternalLinkage()) { 4132719bac90525985f4ebb97324b4c087d47b54384Chris Lattner assert(DF && DF->getName() == SF->getName() &&DF->hasInternalLinkage()); 4142719bac90525985f4ebb97324b4c087d47b54384Chris Lattner DF->setName(""); 4152719bac90525985f4ebb97324b4c087d47b54384Chris Lattner NewDF->setName(SF->getName()); // Force the name back 4162719bac90525985f4ebb97324b4c087d47b54384Chris Lattner DF->setName(SF->getName()); // This will cause a renaming 4172719bac90525985f4ebb97324b4c087d47b54384Chris Lattner assert(NewDF->getName() == SF->getName() && 4182719bac90525985f4ebb97324b4c087d47b54384Chris Lattner DF->getName() != SF->getName()); 4192719bac90525985f4ebb97324b4c087d47b54384Chris Lattner } 4204ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner 4214ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // ... and remember this mapping... 4222719bac90525985f4ebb97324b4c087d47b54384Chris Lattner ValueMap.insert(std::make_pair(SF, NewDF)); 423c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SF->isExternal()) { 424c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // If SF is external or if both SF & DF are external.. Just link the 425c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // external functions, we aren't adding anything. 426c2b97d43a074445c6856d69538a95de09450c26eChris Lattner ValueMap.insert(std::make_pair(SF, DF)); 427c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (DF->isExternal()) { // If DF is external but SF is not... 428c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // Link the external functions, update linkage qualifiers 429c2b97d43a074445c6856d69538a95de09450c26eChris Lattner ValueMap.insert(std::make_pair(SF, DF)); 430c2b97d43a074445c6856d69538a95de09450c26eChris Lattner DF->setLinkage(SF->getLinkage()); 431c2b97d43a074445c6856d69538a95de09450c26eChris Lattner 432c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SF->getLinkage() != DF->getLinkage()) { 4330fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner return Error(Err, "Functions named '" + SF->getName() + 4340fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner "' have different linkage specifiers!"); 435c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SF->hasExternalLinkage()) { 436c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // The function is defined in both modules!! 437c2b97d43a074445c6856d69538a95de09450c26eChris Lattner return Error(Err, "Function '" + 438c2b97d43a074445c6856d69538a95de09450c26eChris Lattner SF->getFunctionType()->getDescription() + "':\"" + 439c2b97d43a074445c6856d69538a95de09450c26eChris Lattner SF->getName() + "\" - Function is already defined!"); 440c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SF->hasLinkOnceLinkage()) { 4414ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // Completely ignore the source function. 44218961504fc2b299578dba817900a0696cf3ccc4dChris Lattner ValueMap.insert(std::make_pair(SF, DF)); 443c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else { 444c2b97d43a074445c6856d69538a95de09450c26eChris Lattner assert(0 && "Unknown linkage configuration found!"); 4455c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 4465c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 4475c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 4485c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 4495c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 450c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBody - Copy the source function over into the dest function and 451c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// fix up references to values. At this point we know that Dest is an external 452c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function, and that Src is not. 4535c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 45479df7c0aaa18129e55968c8783ef8346807bd4afChris Lattnerstatic bool LinkFunctionBody(Function *Dest, const Function *Src, 4555c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &GlobalMap, 4565c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 4575c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner assert(Src && Dest && Dest->isExternal() && !Src->isExternal()); 4585c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> LocalMap; // Map for function local values 4595c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 460c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Go through and convert function arguments over... 46169da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner Function::aiterator DI = Dest->abegin(); 46218961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Function::const_aiterator I = Src->abegin(), E = Src->aend(); 46369da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner I != E; ++I, ++DI) { 46469da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner DI->setName(I->getName()); // Copy the name information over... 4655c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4665c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Add a mapping to our local map 46769da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner LocalMap.insert(std::make_pair(I, DI)); 4685c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 4695c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4705c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Loop over all of the basic blocks, copying the instructions over... 4715c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 47279df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner for (Function::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) { 473c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Create new basic block and add to mapping and the Dest function... 47418961504fc2b299578dba817900a0696cf3ccc4dChris Lattner BasicBlock *DBB = new BasicBlock(I->getName(), Dest); 47518961504fc2b299578dba817900a0696cf3ccc4dChris Lattner LocalMap.insert(std::make_pair(I, DBB)); 4765c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4775c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Loop over all of the instructions in the src basic block, copying them 4785c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // over. Note that this is broken in a strict sense because the cloned 4795c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // instructions will still be referencing values in the Src module, not 4805c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // the remapped values. In our case, however, we will not get caught and 4815c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // so we can delay patching the values up until later... 4825c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 48318961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (BasicBlock::const_iterator II = I->begin(), IE = I->end(); 4845c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner II != IE; ++II) { 48518961504fc2b299578dba817900a0696cf3ccc4dChris Lattner Instruction *DI = II->clone(); 48618961504fc2b299578dba817900a0696cf3ccc4dChris Lattner DI->setName(II->getName()); 4875c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner DBB->getInstList().push_back(DI); 48818961504fc2b299578dba817900a0696cf3ccc4dChris Lattner LocalMap.insert(std::make_pair(II, DI)); 4895c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 4905c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 4915c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 492c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // At this point, all of the instructions and values of the function are now 493c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // copied over. The only problem is that they are still referencing values in 494c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // the Source function as operands. Loop through all of the operands of the 495c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // functions and patch them up to point to the local versions... 4965c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 49718961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Function::iterator BB = Dest->begin(), BE = Dest->end(); BB != BE; ++BB) 49818961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) 49918961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Instruction::op_iterator OI = I->op_begin(), OE = I->op_end(); 500221d688a5ef21a22c2368c9fff0e92d7966c95e5Chris Lattner OI != OE; ++OI) 501221d688a5ef21a22c2368c9fff0e92d7966c95e5Chris Lattner *OI = RemapOperand(*OI, LocalMap, &GlobalMap); 5025c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 5035c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 5045c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 5055c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 5065c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 507c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBodies - Link in the function bodies that are defined in the 508c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// source module into the DestModule. This consists basically of copying the 509c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function over and fixing up references to values. 5105c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 51179df7c0aaa18129e55968c8783ef8346807bd4afChris Lattnerstatic bool LinkFunctionBodies(Module *Dest, const Module *Src, 5125c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 5135c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 5145c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 515c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Loop over all of the functions in the src module, mapping them over as we 516c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // go 5175c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 51818961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Module::const_iterator SF = Src->begin(), E = Src->end(); SF != E; ++SF){ 51918961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (!SF->isExternal()) { // No body if function is external 52018961504fc2b299578dba817900a0696cf3ccc4dChris Lattner Function *DF = cast<Function>(ValueMap[SF]); // Destination function 521c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner 52218961504fc2b299578dba817900a0696cf3ccc4dChris Lattner // DF not external SF external? 52318961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (!DF->isExternal()) { 5244ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (DF->hasLinkOnceLinkage()) continue; // No relinkage for link-once! 525c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner if (Err) 5265c2d335d86579941b71816196a95a64b277e8963Chris Lattner *Err = "Function '" + (SF->hasName() ? SF->getName() :std::string("")) 5275c2d335d86579941b71816196a95a64b277e8963Chris Lattner + "' body multiply defined!"; 528c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner return true; 529c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner } 5305c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 53118961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (LinkFunctionBody(DF, SF, ValueMap, Err)) return true; 532c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner } 5335c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 5345c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 5355c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 5365c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 5378166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// LinkAppendingVars - If there were any appending global variables, link them 5388166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// together now. Return true on error. 5398166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// 5408166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattnerstatic bool LinkAppendingVars(Module *M, 5418166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 5428166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::string *ErrorMsg) { 5438166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (AppendingVars.empty()) return false; // Nothing to do. 5448166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 5458166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Loop over the multimap of appending vars, processing any variables with the 5468166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // same name, forming a new appending global variable with both of the 5478166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers merged together, then rewrite references to the old variables 5488166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // and delete them. 5498166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // 5508166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::vector<Constant*> Inits; 5518166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner while (AppendingVars.size() > 1) { 5528166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Get the first two elements in the map... 5538166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, 5548166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable*>::iterator Second = AppendingVars.begin(), First=Second++; 5558166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 5568166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If the first two elements are for different names, there is no pair... 5578166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Otherwise there is a pair, so link them together... 5588166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (First->first == Second->first) { 5598166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *G1 = First->second, *G2 = Second->second; 5608166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T1 = cast<ArrayType>(G1->getType()->getElementType()); 5618166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T2 = cast<ArrayType>(G2->getType()->getElementType()); 5628166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 5638166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Check to see that they two arrays agree on type... 5648166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (T1->getElementType() != T2->getElementType()) 5658166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 5668166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables with different element types need to be linked!"); 5678166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (G1->isConstant() != G2->isConstant()) 5688166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 5698166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables linked with different const'ness!"); 5708166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 5718166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner unsigned NewSize = T1->getNumElements() + T2->getNumElements(); 5728166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner ArrayType *NewType = ArrayType::get(T1->getElementType(), NewSize); 5738166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 5748166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Create the new global variable... 5758166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NG = 5768166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner new GlobalVariable(NewType, G1->isConstant(), G1->getLinkage(), 5778166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner /*init*/0, First->first, M); 5788166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 5798166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Merge the initializer... 5808166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.reserve(NewSize); 5818166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner ConstantArray *I = cast<ConstantArray>(G1->getInitializer()); 5828166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i) 5838166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.push_back(cast<Constant>(I->getValues()[i])); 5848166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner I = cast<ConstantArray>(G2->getInitializer()); 5858166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i) 5868166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.push_back(cast<Constant>(I->getValues()[i])); 5878166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner NG->setInitializer(ConstantArray::get(NewType, Inits)); 5888166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.clear(); 5898166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 5908166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Replace any uses of the two global variables with uses of the new 5918166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // global... 5928166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 5938166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // FIXME: This should rewrite simple/straight-forward uses such as 5948166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // getelementptr instructions to not use the Cast! 5958166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner ConstantPointerRef *NGCP = ConstantPointerRef::get(NG); 5968166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner G1->replaceAllUsesWith(ConstantExpr::getCast(NGCP, G1->getType())); 5978166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner G2->replaceAllUsesWith(ConstantExpr::getCast(NGCP, G2->getType())); 5988166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 5998166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Remove the two globals from the module now... 6008166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G1); 6018166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G2); 6028166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 6038166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Put the new global into the AppendingVars map so that we can handle 6048166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // linking of more than two vars... 6058166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Second->second = NG; 6068166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 6078166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.erase(First); 6088166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 6098166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 6108166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return false; 6118166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner} 61252f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 61352f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 61452f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// LinkModules - This function links two modules together, with the resulting 61552f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// left module modified to be the composite of the two input modules. If an 61652f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// error occurs, true is returned and ErrorMsg (if not null) is set to indicate 6175c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// the problem. Upon failure, the Dest module could be in a modified state, and 6185c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// shouldn't be relied on to be consistent. 61952f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// 6205c2d335d86579941b71816196a95a64b277e8963Chris Lattnerbool LinkModules(Module *Dest, const Module *Src, std::string *ErrorMsg) { 62143a9994c0164848d44527060da72985c75183a48Chris Lattner if (Dest->getEndianness() != Src->getEndianness()) 62243a9994c0164848d44527060da72985c75183a48Chris Lattner std::cerr << "WARNING: Linking two modules of different endianness!\n"; 62343a9994c0164848d44527060da72985c75183a48Chris Lattner if (Dest->getPointerSize() != Src->getPointerSize()) 62443a9994c0164848d44527060da72985c75183a48Chris Lattner std::cerr << "WARNING: Linking two modules of different pointer size!\n"; 6252c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 6262c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // LinkTypes - Go through the symbol table of the Src module and see if any 6272c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // types are named in the src module that are not named in the Dst module. 6282c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Make sure there are no type name conflicts. 6292c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // 6302c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner if (LinkTypes(Dest, Src, ErrorMsg)) return true; 6312c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 6325c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // ValueMap - Mapping of values from what they used to be in Src, to what they 6335c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // are now in Dest. 6345c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 6355c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> ValueMap; 6365c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 6378166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars - Keep track of global variables in the destination module 6388166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // with appending linkage. After the module is linked together, they are 6398166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // appended and the module is rewritten. 6408166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // 6418166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> AppendingVars; 6428166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 6438166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Add all of the appending globals already in the Dest module to 6448166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars. 6458166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner for (Module::giterator I = Dest->gbegin(), E = Dest->gend(); I != E; ++I) 646f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner if (I->hasAppendingLinkage()) 647f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner AppendingVars.insert(std::make_pair(I->getName(), I)); 6488166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 6498166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Insert all of the globals in src into the Dest module... without linking 6508166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers (which could refer to functions not yet mapped over). 6518166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // 6528166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (LinkGlobals(Dest, Src, ValueMap, AppendingVars, ErrorMsg)) return true; 6535c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 654c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link the functions together between the two modules, without doing function 655c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // bodies... this just adds external function prototypes to the Dest 656c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // function... We do this so that when we begin processing function bodies, 657c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // all of the global values that may be referenced are available in our 658c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // ValueMap. 6595c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 66079df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner if (LinkFunctionProtos(Dest, Src, ValueMap, ErrorMsg)) return true; 6615c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 6626cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // Update the initializers in the Dest module now that all globals that may 6636cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // be referenced are in Dest. 6646cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // 6656cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner if (LinkGlobalInits(Dest, Src, ValueMap, ErrorMsg)) return true; 6666cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner 667c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link in the function bodies that are defined in the source module into the 668c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // DestModule. This consists basically of copying the function over and 669c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // fixing up references to values. 6705c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 67179df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner if (LinkFunctionBodies(Dest, Src, ValueMap, ErrorMsg)) return true; 67252f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 6738166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If there were any appending global variables, link them together now. 6748166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // 6758166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (LinkAppendingVars(Dest, AppendingVars, ErrorMsg)) return true; 6768166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 67752f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner return false; 67852f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner} 6799466f5113ba859677a28887c3c7143065e702019Vikram S. Adve 680