LinkModules.cpp revision 43f4ba8c7d19664bb5de73a7b391b67061f25d22
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// 30e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattnerstatic bool ResolveTypes(const Type *DestTy, const Type *SrcTy, 31e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner SymbolTable *DestST, const std::string &Name) { 32e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DestTy == SrcTy) return false; // If already equal, noop 33e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 344c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Does the type already exist in the module? 354c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (DestTy && !isa<OpaqueType>(DestTy)) { // Yup, the type already exists... 36e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (const OpaqueType *OT = dyn_cast<OpaqueType>(SrcTy)) { 37e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner const_cast<OpaqueType*>(OT)->refineAbstractTypeTo(DestTy); 384c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } else { 394c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner return true; // Cannot link types... neither is opaque and not-equal 404c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 414c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } else { // Type not in dest module. Add it now. 424c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (DestTy) // Type _is_ in module, just opaque... 43e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner const_cast<OpaqueType*>(cast<OpaqueType>(DestTy)) 44e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner ->refineAbstractTypeTo(SrcTy); 454c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner else 46e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner DestST->insert(Name, const_cast<Type*>(SrcTy)); 474c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 484c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner return false; 494c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner} 504c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 5143f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattnerstatic const FunctionType *getFT(const PATypeHolder &TH) { 5243f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return cast<FunctionType>(TH.get()); 5343f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner} 5443f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattnerstatic const StructType *getsT(const PATypeHolder &TH) { 5543f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return cast<StructType>(TH.get()); 5643f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner} 57e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 58e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// RecursiveResolveTypes - This is just like ResolveTypes, except that it 59e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// recurses down into derived types, merging the used types if the parent types 60e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// are compatible. 61e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// 6243f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattnerstatic bool RecursiveResolveTypes(const PATypeHolder &DestTy, 6343f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner const PATypeHolder &SrcTy, 64e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner SymbolTable *DestST, const std::string &Name){ 6543f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner const Type *SrcTyT = SrcTy.get(); 6643f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner const Type *DestTyT = DestTy.get(); 6743f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner if (DestTyT == SrcTyT) return false; // If already equal, noop 68e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 69e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // If we found our opaque type, resolve it now! 7043f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner if (isa<OpaqueType>(DestTyT) || isa<OpaqueType>(SrcTyT)) 7143f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return ResolveTypes(DestTyT, SrcTyT, DestST, Name); 72e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 73e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Two types cannot be resolved together if they are of different primitive 74e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // type. For example, we cannot resolve an int to a float. 7543f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner if (DestTyT->getPrimitiveID() != SrcTyT->getPrimitiveID()) return true; 76e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 77e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Otherwise, resolve the used type used by this derived type... 7843f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner switch (DestTyT->getPrimitiveID()) { 79e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::FunctionTyID: { 8043f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner if (cast<FunctionType>(DestTyT)->isVarArg() != 8143f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner cast<FunctionType>(SrcTyT)->isVarArg()) 8243f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return true; 8343f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner for (unsigned i = 0, e = getFT(DestTy)->getNumContainedTypes(); i != e; ++i) 8443f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner if (RecursiveResolveTypes(getFT(DestTy)->getContainedType(i), 8543f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner getFT(SrcTy)->getContainedType(i), DestST,Name)) 86e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return true; 87e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return false; 88e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 89e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::StructTyID: { 9043f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner if (getST(DestTy)->getNumContainedTypes() != 9143f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner getST(SrcTy)->getNumContainedTypes()) return 1; 9243f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner for (unsigned i = 0, e = getST(DestTy)->getNumContainedTypes(); i != e; ++i) 9343f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner if (RecursiveResolveTypes(getST(DestTy)->getContainedType(i), 9443f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner getST(SrcTy)->getContainedType(i), DestST,Name)) 95e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return true; 96e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return false; 97e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 98e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::ArrayTyID: { 9943f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner const ArrayType *DAT = cast<ArrayType>(DestTy.get()); 10043f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner const ArrayType *SAT = cast<ArrayType>(SrcTy.get()); 101e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DAT->getNumElements() != SAT->getNumElements()) return true; 102e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return RecursiveResolveTypes(DAT->getElementType(), SAT->getElementType(), 103e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner DestST, Name); 104e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 105e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::PointerTyID: 10643f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return RecursiveResolveTypes( 10743f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner cast<PointerType>(DestTy.get())->getElementType(), 10843f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner cast<PointerType>(SrcTy.get())->getElementType(), 109e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner DestST, Name); 110e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner default: assert(0 && "Unexpected type!"); return true; 111e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 112e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner} 113e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 114e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 1152c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// LinkTypes - Go through the symbol table of the Src module and see if any 1162c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// types are named in the src module that are not named in the Dst module. 1172c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// Make sure there are no type name conflicts. 1182c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// 1195c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic bool LinkTypes(Module *Dest, const Module *Src, std::string *Err) { 1206e6026b46569b01f8f6d4dcdb6c899c3a9c76b3eChris Lattner SymbolTable *DestST = &Dest->getSymbolTable(); 1216e6026b46569b01f8f6d4dcdb6c899c3a9c76b3eChris Lattner const SymbolTable *SrcST = &Src->getSymbolTable(); 1222c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 1232c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Look for a type plane for Type's... 1242c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner SymbolTable::const_iterator PI = SrcST->find(Type::TypeTy); 1252c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner if (PI == SrcST->end()) return false; // No named types, do nothing. 1262c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 1274c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Some types cannot be resolved immediately becuse they depend on other types 1284c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // being resolved to each other first. This contains a list of types we are 1294c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // waiting to recheck. 1304c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner std::vector<std::string> DelayedTypesToResolve; 1314c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 1322c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner const SymbolTable::VarMap &VM = PI->second; 1332c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner for (SymbolTable::type_const_iterator I = VM.begin(), E = VM.end(); 1342c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner I != E; ++I) { 1355c2d335d86579941b71816196a95a64b277e8963Chris Lattner const std::string &Name = I->first; 1364c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner Type *RHS = cast<Type>(I->second); 1372c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 1382c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Check to see if this type name is already in the dest module... 1394c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner Type *Entry = cast_or_null<Type>(DestST->lookup(Type::TypeTy, Name)); 1404c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 1414c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (ResolveTypes(Entry, RHS, DestST, Name)) { 1424c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // They look different, save the types 'till later to resolve. 1434c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner DelayedTypesToResolve.push_back(Name); 1444c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 1454c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 1464c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 1474c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Iteratively resolve types while we can... 1484c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner while (!DelayedTypesToResolve.empty()) { 1494c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Loop over all of the types, attempting to resolve them if possible... 1504c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner unsigned OldSize = DelayedTypesToResolve.size(); 1514c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 152e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Try direct resolution by name... 1534c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner for (unsigned i = 0; i != DelayedTypesToResolve.size(); ++i) { 1544c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner const std::string &Name = DelayedTypesToResolve[i]; 1554c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner Type *T1 = cast<Type>(VM.find(Name)->second); 1564c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner Type *T2 = cast<Type>(DestST->lookup(Type::TypeTy, Name)); 1574c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (!ResolveTypes(T2, T1, DestST, Name)) { 1584c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // We are making progress! 1594c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i); 1604c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner --i; 1612f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner } 1624c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 1632f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner 1644c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Did we not eliminate any types? 1654c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (DelayedTypesToResolve.size() == OldSize) { 166e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Attempt to resolve subelements of types. This allows us to merge these 167e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // two types: { int* } and { opaque* } 1684c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner for (unsigned i = 0, e = DelayedTypesToResolve.size(); i != e; ++i) { 1694c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner const std::string &Name = DelayedTypesToResolve[i]; 17043f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner PATypeHolder T1(cast<Type>(VM.find(Name)->second)); 17143f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner PATypeHolder T2(cast<Type>(DestST->lookup(Type::TypeTy, Name))); 172e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 173e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (!RecursiveResolveTypes(T2, T1, DestST, Name)) { 174e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // We are making progress! 175e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i); 176e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 177e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Go back to the main loop, perhaps we can resolve directly by name 178e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // now... 179e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner break; 180e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 181e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 182e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 183e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // If we STILL cannot resolve the types, then there is something wrong. 184e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Report the error. 185e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DelayedTypesToResolve.size() == OldSize) { 186e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Build up an error message of all of the mismatched types. 187e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner std::string ErrorMessage; 188e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner for (unsigned i = 0, e = DelayedTypesToResolve.size(); i != e; ++i) { 189e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner const std::string &Name = DelayedTypesToResolve[i]; 190e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner const Type *T1 = cast<Type>(VM.find(Name)->second); 191e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner const Type *T2 = cast<Type>(DestST->lookup(Type::TypeTy, Name)); 192e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner ErrorMessage += " Type named '" + Name + 193e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner "' conflicts.\n Src='" + T1->getDescription() + 194e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner "'.\n Dest='" + T2->getDescription() + "'\n"; 195e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 196e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return Error(Err, "Type conflict between types in modules:\n" + 197e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner ErrorMessage); 1984c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 1992c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner } 2002c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner } 2014c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 2024c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 2032c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner return false; 2042c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner} 2052c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 2065c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic void PrintMap(const std::map<const Value*, Value*> &M) { 2075c2d335d86579941b71816196a95a64b277e8963Chris Lattner for (std::map<const Value*, Value*>::const_iterator I = M.begin(), E =M.end(); 2082d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner I != E; ++I) { 2095c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << " Fr: " << (void*)I->first << " "; 21087182ae6baf28ca6da6ee4bc00cf1857f293acfeChris Lattner I->first->dump(); 2115c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << " To: " << (void*)I->second << " "; 21287182ae6baf28ca6da6ee4bc00cf1857f293acfeChris Lattner I->second->dump(); 2135c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << "\n"; 2142d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner } 2152d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner} 2162d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 2172d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 2185c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// RemapOperand - Use LocalMap and GlobalMap to convert references from one 2195c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// module to another. This is somewhat sophisticated in that it can 2205c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// automatically handle constant references correctly as well... 2215c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 2225c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic Value *RemapOperand(const Value *In, 2235c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &LocalMap, 2245c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> *GlobalMap) { 2255c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*,Value*>::const_iterator I = LocalMap.find(In); 2265c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner if (I != LocalMap.end()) return I->second; 2275c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 2285c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner if (GlobalMap) { 2295c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner I = GlobalMap->find(In); 2305c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner if (I != GlobalMap->end()) return I->second; 2315c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 2325c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 2338d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Check to see if it's a constant that we are interesting in transforming... 23418961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (const Constant *CPV = dyn_cast<Constant>(In)) { 2356cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner if (!isa<DerivedType>(CPV->getType()) && !isa<ConstantExpr>(CPV)) 23618961504fc2b299578dba817900a0696cf3ccc4dChris Lattner return const_cast<Constant*>(CPV); // Simple constants stay identical... 2378d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 238e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Constant *Result = 0; 2398d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 24018961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (const ConstantArray *CPA = dyn_cast<ConstantArray>(CPV)) { 241697954c15da58bd8b186dbafdedd8b06db770201Chris Lattner const std::vector<Use> &Ops = CPA->getValues(); 242697954c15da58bd8b186dbafdedd8b06db770201Chris Lattner std::vector<Constant*> Operands(Ops.size()); 243e306d94782b1c608857738279852dcc050c66004Chris Lattner for (unsigned i = 0, e = Ops.size(); i != e; ++i) 2448d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner Operands[i] = 245e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner cast<Constant>(RemapOperand(Ops[i], LocalMap, GlobalMap)); 246e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Result = ConstantArray::get(cast<ArrayType>(CPA->getType()), Operands); 24718961504fc2b299578dba817900a0696cf3ccc4dChris Lattner } else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(CPV)) { 248697954c15da58bd8b186dbafdedd8b06db770201Chris Lattner const std::vector<Use> &Ops = CPS->getValues(); 249697954c15da58bd8b186dbafdedd8b06db770201Chris Lattner std::vector<Constant*> Operands(Ops.size()); 2508d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner for (unsigned i = 0; i < Ops.size(); ++i) 2518d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner Operands[i] = 252e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner cast<Constant>(RemapOperand(Ops[i], LocalMap, GlobalMap)); 253e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Result = ConstantStruct::get(cast<StructType>(CPS->getType()), Operands); 254e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner } else if (isa<ConstantPointerNull>(CPV)) { 25518961504fc2b299578dba817900a0696cf3ccc4dChris Lattner Result = const_cast<Constant*>(CPV); 25618961504fc2b299578dba817900a0696cf3ccc4dChris Lattner } else if (const ConstantPointerRef *CPR = 25718961504fc2b299578dba817900a0696cf3ccc4dChris Lattner dyn_cast<ConstantPointerRef>(CPV)) { 2588d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner Value *V = RemapOperand(CPR->getValue(), LocalMap, GlobalMap); 259e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Result = ConstantPointerRef::get(cast<GlobalValue>(V)); 2606cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) { 261b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner if (CE->getOpcode() == Instruction::GetElementPtr) { 262b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner Value *Ptr = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap); 263b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner std::vector<Constant*> Indices; 264b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner Indices.reserve(CE->getNumOperands()-1); 265b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i) 266b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner Indices.push_back(cast<Constant>(RemapOperand(CE->getOperand(i), 267b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner LocalMap, GlobalMap))); 268b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner 269b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner Result = ConstantExpr::getGetElementPtr(cast<Constant>(Ptr), Indices); 270b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner } else if (CE->getNumOperands() == 1) { 271ad333484ea5ae976b83e35ccd3f6cfa6e71290e2Chris Lattner // Cast instruction 272ad333484ea5ae976b83e35ccd3f6cfa6e71290e2Chris Lattner assert(CE->getOpcode() == Instruction::Cast); 2736cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner Value *V = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap); 274ad333484ea5ae976b83e35ccd3f6cfa6e71290e2Chris Lattner Result = ConstantExpr::getCast(cast<Constant>(V), CE->getType()); 2756cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } else if (CE->getNumOperands() == 2) { 2766cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // Binary operator... 2776cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner Value *V1 = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap); 2786cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner Value *V2 = RemapOperand(CE->getOperand(1), LocalMap, GlobalMap); 2796cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner 2806cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner Result = ConstantExpr::get(CE->getOpcode(), cast<Constant>(V1), 281e8e4605021141d689493132a9c7c6fce6294937fChris Lattner cast<Constant>(V2)); 2826cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } else { 283b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner assert(0 && "Unknown constant expr type!"); 2846cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } 2856cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner 2868d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } else { 2878d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner assert(0 && "Unknown type of derived type constant value!"); 2888d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 2898d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 2908d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Cache the mapping in our local map structure... 291d149c053cdbb406b7b5dff24127b4c509420893eChris Lattner if (GlobalMap) 292d149c053cdbb406b7b5dff24127b4c509420893eChris Lattner GlobalMap->insert(std::make_pair(In, Result)); 293d149c053cdbb406b7b5dff24127b4c509420893eChris Lattner else 294d149c053cdbb406b7b5dff24127b4c509420893eChris Lattner LocalMap.insert(std::make_pair(In, Result)); 2958d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return Result; 2968d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 2972d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 2985c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << "XXX LocalMap: \n"; 2992d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner PrintMap(LocalMap); 3002d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 3012d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner if (GlobalMap) { 3025c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << "XXX GlobalMap: \n"; 3032d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner PrintMap(*GlobalMap); 3042d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner } 3052d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 3065c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << "Couldn't remap value: " << (void*)In << " " << *In << "\n"; 3078d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner assert(0 && "Couldn't remap value!"); 3088d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return 0; 3095c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 3105c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 3115c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 3125c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// LinkGlobals - Loop through the global variables in the src module and merge 3138166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// them into the dest module. 3145c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 3155c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattnerstatic bool LinkGlobals(Module *Dest, const Module *Src, 3165c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 3178166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 3185c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 3195c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // We will need a module level symbol table if the src module has a module 3205c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // level symbol table... 321b91b657e026e86082b665cc875c2881ed075b68dChris Lattner SymbolTable *ST = (SymbolTable*)&Dest->getSymbolTable(); 3225c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 3235c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 3245c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 3255c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner for (Module::const_giterator I = Src->gbegin(), E = Src->gend(); I != E; ++I){ 32618961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const GlobalVariable *SGV = I; 3274ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner GlobalVariable *DGV = 0; 3284ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (SGV->hasName()) { 3294ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // A same named thing is a global variable, because the only two things 33079df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner // that may be in a module level symbol table are Global Vars and 33179df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner // Functions, and they both have distinct, nonoverlapping, possible types. 3325c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 3334ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner DGV = cast_or_null<GlobalVariable>(ST->lookup(SGV->getType(), 3344ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner SGV->getName())); 3354ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } 3365c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 3374ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(SGV->hasInitializer() || SGV->hasExternalLinkage() && 3384ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner "Global must either be external or have an initializer!"); 3395c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 3400fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner bool SGExtern = SGV->isExternal(); 3410fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner bool DGExtern = DGV ? DGV->isExternal() : false; 3420fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner 3434ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (!DGV || DGV->hasInternalLinkage() || SGV->hasInternalLinkage()) { 3445c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // No linking to be performed, simply create an identical version of the 3458d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // symbol over in the dest module... the initializer will be filled in 3468d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // later by LinkGlobalInits... 3478d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // 3482719bac90525985f4ebb97324b4c087d47b54384Chris Lattner GlobalVariable *NewDGV = 3492719bac90525985f4ebb97324b4c087d47b54384Chris Lattner new GlobalVariable(SGV->getType()->getElementType(), 3502719bac90525985f4ebb97324b4c087d47b54384Chris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 3512719bac90525985f4ebb97324b4c087d47b54384Chris Lattner SGV->getName(), Dest); 3522719bac90525985f4ebb97324b4c087d47b54384Chris Lattner 3532719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // If the LLVM runtime renamed the global, but it is an externally visible 3542719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // symbol, DGV must be an existing global with internal linkage. Rename 3552719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // it. 3562719bac90525985f4ebb97324b4c087d47b54384Chris Lattner if (NewDGV->getName() != SGV->getName() && !NewDGV->hasInternalLinkage()){ 3572719bac90525985f4ebb97324b4c087d47b54384Chris Lattner assert(DGV && DGV->getName() == SGV->getName() && 3582719bac90525985f4ebb97324b4c087d47b54384Chris Lattner DGV->hasInternalLinkage()); 3592719bac90525985f4ebb97324b4c087d47b54384Chris Lattner DGV->setName(""); 3602719bac90525985f4ebb97324b4c087d47b54384Chris Lattner NewDGV->setName(SGV->getName()); // Force the name back 3612719bac90525985f4ebb97324b4c087d47b54384Chris Lattner DGV->setName(SGV->getName()); // This will cause a renaming 3622719bac90525985f4ebb97324b4c087d47b54384Chris Lattner assert(NewDGV->getName() == SGV->getName() && 3632719bac90525985f4ebb97324b4c087d47b54384Chris Lattner DGV->getName() != SGV->getName()); 3642719bac90525985f4ebb97324b4c087d47b54384Chris Lattner } 3655c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 3665c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Make sure to remember this mapping... 3672719bac90525985f4ebb97324b4c087d47b54384Chris Lattner ValueMap.insert(std::make_pair(SGV, NewDGV)); 3688166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (SGV->hasAppendingLinkage()) 3698166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Keep track that this is an appending variable... 3708166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV)); 3718166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 372c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SGV->isExternal()) { 373c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // If SGV is external or if both SGV & DGV are external.. Just link the 374c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // external globals, we aren't adding anything. 375c2b97d43a074445c6856d69538a95de09450c26eChris Lattner ValueMap.insert(std::make_pair(SGV, DGV)); 376c2b97d43a074445c6856d69538a95de09450c26eChris Lattner 377c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (DGV->isExternal()) { // If DGV is external but SGV is not... 378c2b97d43a074445c6856d69538a95de09450c26eChris Lattner ValueMap.insert(std::make_pair(SGV, DGV)); 379c2b97d43a074445c6856d69538a95de09450c26eChris Lattner DGV->setLinkage(SGV->getLinkage()); // Inherit linkage! 380c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SGV->getLinkage() != DGV->getLinkage()) { 3814ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner return Error(Err, "Global variables named '" + SGV->getName() + 3824ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner "' have different linkage specifiers!"); 383c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SGV->hasExternalLinkage()) { 384c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // Allow linking two exactly identical external global variables... 385c2b97d43a074445c6856d69538a95de09450c26eChris Lattner if (SGV->isConstant() != DGV->isConstant() || 386c2b97d43a074445c6856d69538a95de09450c26eChris Lattner SGV->getInitializer() != DGV->getInitializer()) 387c2b97d43a074445c6856d69538a95de09450c26eChris Lattner return Error(Err, "Global Variable Collision on '" + 388c2b97d43a074445c6856d69538a95de09450c26eChris Lattner SGV->getType()->getDescription() + " %" + SGV->getName() + 389c2b97d43a074445c6856d69538a95de09450c26eChris Lattner "' - Global variables differ in const'ness"); 390c2b97d43a074445c6856d69538a95de09450c26eChris Lattner ValueMap.insert(std::make_pair(SGV, DGV)); 391c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SGV->hasLinkOnceLinkage()) { 3924ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // If the global variable has a name, and that name is already in use in 3934ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // the Dest module, make sure that the name is a compatible global 3944ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // variable... 3954ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // 3964ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // Check to see if the two GV's have the same Const'ness... 3974ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (SGV->isConstant() != DGV->isConstant()) 3984ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner return Error(Err, "Global Variable Collision on '" + 399c2b97d43a074445c6856d69538a95de09450c26eChris Lattner SGV->getType()->getDescription() + " %" + SGV->getName() + 400c2b97d43a074445c6856d69538a95de09450c26eChris Lattner "' - Global variables differ in const'ness"); 4010fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner 4024ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // Okay, everything is cool, remember the mapping... 4034ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner ValueMap.insert(std::make_pair(SGV, DGV)); 404c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SGV->hasAppendingLinkage()) { 4058166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // No linking is performed yet. Just insert a new copy of the global, and 4068166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // keep track of the fact that it is an appending variable in the 4078166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars map. The name is cleared out so that no linkage is 4088166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // performed. 4098166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NewDGV = 4108166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner new GlobalVariable(SGV->getType()->getElementType(), 4118166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 4128166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "", Dest); 4138166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 4148166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Make sure to remember this mapping... 4158166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner ValueMap.insert(std::make_pair(SGV, NewDGV)); 4168166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 4178166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Keep track that this is an appending variable... 4188166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV)); 4194ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else { 4204ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(0 && "Unknown linkage!"); 4215c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 4225c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 4235c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 4245c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 4255c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4265c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4278d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// LinkGlobalInits - Update the initializers in the Dest module now that all 4288d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// globals that may be referenced are in Dest. 4298d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// 4308d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattnerstatic bool LinkGlobalInits(Module *Dest, const Module *Src, 4315c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 4325c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 4338d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 4348d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 4358d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // 4368d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner for (Module::const_giterator I = Src->gbegin(), E = Src->gend(); I != E; ++I){ 43718961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const GlobalVariable *SGV = I; 4388d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 4398d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner if (SGV->hasInitializer()) { // Only process initialized GV's 4408d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Figure out what the initializer looks like in the dest module... 4414ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner Constant *SInit = 4422f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner cast<Constant>(RemapOperand(SGV->getInitializer(), ValueMap, 0)); 4438d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 4448d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner GlobalVariable *DGV = cast<GlobalVariable>(ValueMap[SGV]); 4454ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (DGV->hasInitializer()) { 4464ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(SGV->getLinkage() == DGV->getLinkage()); 4474ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (SGV->hasExternalLinkage()) { 4484ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (DGV->getInitializer() != SInit) 4494ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner return Error(Err, "Global Variable Collision on '" + 4504ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner SGV->getType()->getDescription() +"':%"+SGV->getName()+ 4514ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner " - Global variables have different initializers"); 4524ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else if (DGV->hasLinkOnceLinkage()) { 4534ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // Nothing is required, mapped values will take the new global 4544ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // automatically. 4554ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else if (DGV->hasAppendingLinkage()) { 4564ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(0 && "Appending linkage unimplemented!"); 4574ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else { 4584ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(0 && "Unknown linkage!"); 4594ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } 4608d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } else { 4618d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Copy the initializer over now... 4624ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner DGV->setInitializer(SInit); 4638d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 4648d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 4658d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 4668d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return false; 4678d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner} 4685c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 46979df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner// LinkFunctionProtos - Link the functions together between the two modules, 470c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// without doing function bodies... this just adds external function prototypes 471c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// to the Dest function... 4725c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 47379df7c0aaa18129e55968c8783ef8346807bd4afChris Lattnerstatic bool LinkFunctionProtos(Module *Dest, const Module *Src, 4745c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 4755c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 476b91b657e026e86082b665cc875c2881ed075b68dChris Lattner SymbolTable *ST = (SymbolTable*)&Dest->getSymbolTable(); 4775c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 478c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Loop over all of the functions in the src module, mapping them over as we 479c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // go 4805c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 4815c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner for (Module::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) { 48218961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const Function *SF = I; // SrcFunction 4834ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner Function *DF = 0; 4844ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (SF->hasName()) 48579df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner // The same named thing is a Function, because the only two things 48679df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner // that may be in a module level symbol table are Global Vars and 48779df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner // Functions, and they both have distinct, nonoverlapping, possible types. 4885c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 4894ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner DF = cast_or_null<Function>(ST->lookup(SF->getType(), SF->getName())); 4905c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4914ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (!DF || SF->hasInternalLinkage() || DF->hasInternalLinkage()) { 4920fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner // Function does not already exist, simply insert an function signature 4930fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner // identical to SF into the dest module... 4942719bac90525985f4ebb97324b4c087d47b54384Chris Lattner Function *NewDF = new Function(SF->getFunctionType(), SF->getLinkage(), 4952719bac90525985f4ebb97324b4c087d47b54384Chris Lattner SF->getName(), Dest); 4962719bac90525985f4ebb97324b4c087d47b54384Chris Lattner 4972719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // If the LLVM runtime renamed the function, but it is an externally 4982719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // visible symbol, DF must be an existing function with internal linkage. 4992719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // Rename it. 5002719bac90525985f4ebb97324b4c087d47b54384Chris Lattner if (NewDF->getName() != SF->getName() && !NewDF->hasInternalLinkage()) { 5012719bac90525985f4ebb97324b4c087d47b54384Chris Lattner assert(DF && DF->getName() == SF->getName() &&DF->hasInternalLinkage()); 5022719bac90525985f4ebb97324b4c087d47b54384Chris Lattner DF->setName(""); 5032719bac90525985f4ebb97324b4c087d47b54384Chris Lattner NewDF->setName(SF->getName()); // Force the name back 5042719bac90525985f4ebb97324b4c087d47b54384Chris Lattner DF->setName(SF->getName()); // This will cause a renaming 5052719bac90525985f4ebb97324b4c087d47b54384Chris Lattner assert(NewDF->getName() == SF->getName() && 5062719bac90525985f4ebb97324b4c087d47b54384Chris Lattner DF->getName() != SF->getName()); 5072719bac90525985f4ebb97324b4c087d47b54384Chris Lattner } 5084ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner 5094ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // ... and remember this mapping... 5102719bac90525985f4ebb97324b4c087d47b54384Chris Lattner ValueMap.insert(std::make_pair(SF, NewDF)); 511c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SF->isExternal()) { 512c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // If SF is external or if both SF & DF are external.. Just link the 513c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // external functions, we aren't adding anything. 514c2b97d43a074445c6856d69538a95de09450c26eChris Lattner ValueMap.insert(std::make_pair(SF, DF)); 515c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (DF->isExternal()) { // If DF is external but SF is not... 516c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // Link the external functions, update linkage qualifiers 517c2b97d43a074445c6856d69538a95de09450c26eChris Lattner ValueMap.insert(std::make_pair(SF, DF)); 518c2b97d43a074445c6856d69538a95de09450c26eChris Lattner DF->setLinkage(SF->getLinkage()); 519c2b97d43a074445c6856d69538a95de09450c26eChris Lattner 520c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SF->getLinkage() != DF->getLinkage()) { 5210fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner return Error(Err, "Functions named '" + SF->getName() + 5220fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner "' have different linkage specifiers!"); 523c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SF->hasExternalLinkage()) { 524c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // The function is defined in both modules!! 525c2b97d43a074445c6856d69538a95de09450c26eChris Lattner return Error(Err, "Function '" + 526c2b97d43a074445c6856d69538a95de09450c26eChris Lattner SF->getFunctionType()->getDescription() + "':\"" + 527c2b97d43a074445c6856d69538a95de09450c26eChris Lattner SF->getName() + "\" - Function is already defined!"); 528c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SF->hasLinkOnceLinkage()) { 5294ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // Completely ignore the source function. 53018961504fc2b299578dba817900a0696cf3ccc4dChris Lattner ValueMap.insert(std::make_pair(SF, DF)); 531c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else { 532c2b97d43a074445c6856d69538a95de09450c26eChris Lattner assert(0 && "Unknown linkage configuration found!"); 5335c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 5345c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 5355c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 5365c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 5375c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 538c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBody - Copy the source function over into the dest function and 539c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// fix up references to values. At this point we know that Dest is an external 540c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function, and that Src is not. 5415c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 54279df7c0aaa18129e55968c8783ef8346807bd4afChris Lattnerstatic bool LinkFunctionBody(Function *Dest, const Function *Src, 5435c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &GlobalMap, 5445c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 5455c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner assert(Src && Dest && Dest->isExternal() && !Src->isExternal()); 5465c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> LocalMap; // Map for function local values 5475c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 548c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Go through and convert function arguments over... 54969da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner Function::aiterator DI = Dest->abegin(); 55018961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Function::const_aiterator I = Src->abegin(), E = Src->aend(); 55169da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner I != E; ++I, ++DI) { 55269da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner DI->setName(I->getName()); // Copy the name information over... 5535c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 5545c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Add a mapping to our local map 55569da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner LocalMap.insert(std::make_pair(I, DI)); 5565c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 5575c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 5585c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Loop over all of the basic blocks, copying the instructions over... 5595c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 56079df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner for (Function::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) { 561c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Create new basic block and add to mapping and the Dest function... 56218961504fc2b299578dba817900a0696cf3ccc4dChris Lattner BasicBlock *DBB = new BasicBlock(I->getName(), Dest); 56318961504fc2b299578dba817900a0696cf3ccc4dChris Lattner LocalMap.insert(std::make_pair(I, DBB)); 5645c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 5655c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Loop over all of the instructions in the src basic block, copying them 5665c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // over. Note that this is broken in a strict sense because the cloned 5675c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // instructions will still be referencing values in the Src module, not 5685c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // the remapped values. In our case, however, we will not get caught and 5695c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // so we can delay patching the values up until later... 5705c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 57118961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (BasicBlock::const_iterator II = I->begin(), IE = I->end(); 5725c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner II != IE; ++II) { 57318961504fc2b299578dba817900a0696cf3ccc4dChris Lattner Instruction *DI = II->clone(); 57418961504fc2b299578dba817900a0696cf3ccc4dChris Lattner DI->setName(II->getName()); 5755c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner DBB->getInstList().push_back(DI); 57618961504fc2b299578dba817900a0696cf3ccc4dChris Lattner LocalMap.insert(std::make_pair(II, DI)); 5775c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 5785c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 5795c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 580c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // At this point, all of the instructions and values of the function are now 581c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // copied over. The only problem is that they are still referencing values in 582c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // the Source function as operands. Loop through all of the operands of the 583c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // functions and patch them up to point to the local versions... 5845c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 58518961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Function::iterator BB = Dest->begin(), BE = Dest->end(); BB != BE; ++BB) 58618961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) 58718961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Instruction::op_iterator OI = I->op_begin(), OE = I->op_end(); 588221d688a5ef21a22c2368c9fff0e92d7966c95e5Chris Lattner OI != OE; ++OI) 589221d688a5ef21a22c2368c9fff0e92d7966c95e5Chris Lattner *OI = RemapOperand(*OI, LocalMap, &GlobalMap); 5905c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 5915c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 5925c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 5935c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 5945c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 595c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBodies - Link in the function bodies that are defined in the 596c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// source module into the DestModule. This consists basically of copying the 597c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function over and fixing up references to values. 5985c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 59979df7c0aaa18129e55968c8783ef8346807bd4afChris Lattnerstatic bool LinkFunctionBodies(Module *Dest, const Module *Src, 6005c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 6015c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 6025c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 603c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Loop over all of the functions in the src module, mapping them over as we 604c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // go 6055c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 60618961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Module::const_iterator SF = Src->begin(), E = Src->end(); SF != E; ++SF){ 60718961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (!SF->isExternal()) { // No body if function is external 60818961504fc2b299578dba817900a0696cf3ccc4dChris Lattner Function *DF = cast<Function>(ValueMap[SF]); // Destination function 609c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner 61018961504fc2b299578dba817900a0696cf3ccc4dChris Lattner // DF not external SF external? 61118961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (!DF->isExternal()) { 6124ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (DF->hasLinkOnceLinkage()) continue; // No relinkage for link-once! 613c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner if (Err) 6145c2d335d86579941b71816196a95a64b277e8963Chris Lattner *Err = "Function '" + (SF->hasName() ? SF->getName() :std::string("")) 6155c2d335d86579941b71816196a95a64b277e8963Chris Lattner + "' body multiply defined!"; 616c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner return true; 617c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner } 6185c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 61918961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (LinkFunctionBody(DF, SF, ValueMap, Err)) return true; 620c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner } 6215c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 6225c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 6235c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 6245c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 6258166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// LinkAppendingVars - If there were any appending global variables, link them 6268166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// together now. Return true on error. 6278166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// 6288166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattnerstatic bool LinkAppendingVars(Module *M, 6298166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 6308166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::string *ErrorMsg) { 6318166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (AppendingVars.empty()) return false; // Nothing to do. 6328166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 6338166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Loop over the multimap of appending vars, processing any variables with the 6348166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // same name, forming a new appending global variable with both of the 6358166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers merged together, then rewrite references to the old variables 6368166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // and delete them. 6378166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // 6388166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::vector<Constant*> Inits; 6398166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner while (AppendingVars.size() > 1) { 6408166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Get the first two elements in the map... 6418166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, 6428166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable*>::iterator Second = AppendingVars.begin(), First=Second++; 6438166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 6448166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If the first two elements are for different names, there is no pair... 6458166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Otherwise there is a pair, so link them together... 6468166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (First->first == Second->first) { 6478166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *G1 = First->second, *G2 = Second->second; 6488166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T1 = cast<ArrayType>(G1->getType()->getElementType()); 6498166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T2 = cast<ArrayType>(G2->getType()->getElementType()); 6508166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 6518166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Check to see that they two arrays agree on type... 6528166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (T1->getElementType() != T2->getElementType()) 6538166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 6548166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables with different element types need to be linked!"); 6558166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (G1->isConstant() != G2->isConstant()) 6568166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 6578166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables linked with different const'ness!"); 6588166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 6598166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner unsigned NewSize = T1->getNumElements() + T2->getNumElements(); 6608166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner ArrayType *NewType = ArrayType::get(T1->getElementType(), NewSize); 6618166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 6628166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Create the new global variable... 6638166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NG = 6648166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner new GlobalVariable(NewType, G1->isConstant(), G1->getLinkage(), 6658166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner /*init*/0, First->first, M); 6668166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 6678166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Merge the initializer... 6688166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.reserve(NewSize); 6698166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner ConstantArray *I = cast<ConstantArray>(G1->getInitializer()); 6708166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i) 6718166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.push_back(cast<Constant>(I->getValues()[i])); 6728166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner I = cast<ConstantArray>(G2->getInitializer()); 6738166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i) 6748166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.push_back(cast<Constant>(I->getValues()[i])); 6758166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner NG->setInitializer(ConstantArray::get(NewType, Inits)); 6768166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.clear(); 6778166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 6788166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Replace any uses of the two global variables with uses of the new 6798166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // global... 6808166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 6818166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // FIXME: This should rewrite simple/straight-forward uses such as 6828166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // getelementptr instructions to not use the Cast! 6838166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner ConstantPointerRef *NGCP = ConstantPointerRef::get(NG); 6848166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner G1->replaceAllUsesWith(ConstantExpr::getCast(NGCP, G1->getType())); 6858166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner G2->replaceAllUsesWith(ConstantExpr::getCast(NGCP, G2->getType())); 6868166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 6878166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Remove the two globals from the module now... 6888166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G1); 6898166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G2); 6908166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 6918166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Put the new global into the AppendingVars map so that we can handle 6928166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // linking of more than two vars... 6938166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Second->second = NG; 6948166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 6958166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.erase(First); 6968166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 6978166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 6988166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return false; 6998166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner} 70052f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 70152f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 70252f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// LinkModules - This function links two modules together, with the resulting 70352f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// left module modified to be the composite of the two input modules. If an 70452f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// error occurs, true is returned and ErrorMsg (if not null) is set to indicate 7055c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// the problem. Upon failure, the Dest module could be in a modified state, and 7065c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// shouldn't be relied on to be consistent. 70752f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// 7085c2d335d86579941b71816196a95a64b277e8963Chris Lattnerbool LinkModules(Module *Dest, const Module *Src, std::string *ErrorMsg) { 70943a9994c0164848d44527060da72985c75183a48Chris Lattner if (Dest->getEndianness() != Src->getEndianness()) 71043a9994c0164848d44527060da72985c75183a48Chris Lattner std::cerr << "WARNING: Linking two modules of different endianness!\n"; 71143a9994c0164848d44527060da72985c75183a48Chris Lattner if (Dest->getPointerSize() != Src->getPointerSize()) 71243a9994c0164848d44527060da72985c75183a48Chris Lattner std::cerr << "WARNING: Linking two modules of different pointer size!\n"; 7132c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 7142c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // LinkTypes - Go through the symbol table of the Src module and see if any 7152c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // types are named in the src module that are not named in the Dst module. 7162c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Make sure there are no type name conflicts. 7172c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // 7182c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner if (LinkTypes(Dest, Src, ErrorMsg)) return true; 7192c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 7205c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // ValueMap - Mapping of values from what they used to be in Src, to what they 7215c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // are now in Dest. 7225c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 7235c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> ValueMap; 7245c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 7258166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars - Keep track of global variables in the destination module 7268166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // with appending linkage. After the module is linked together, they are 7278166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // appended and the module is rewritten. 7288166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // 7298166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> AppendingVars; 7308166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 7318166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Add all of the appending globals already in the Dest module to 7328166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars. 7338166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner for (Module::giterator I = Dest->gbegin(), E = Dest->gend(); I != E; ++I) 734f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner if (I->hasAppendingLinkage()) 735f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner AppendingVars.insert(std::make_pair(I->getName(), I)); 7368166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 7378166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Insert all of the globals in src into the Dest module... without linking 7388166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers (which could refer to functions not yet mapped over). 7398166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // 7408166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (LinkGlobals(Dest, Src, ValueMap, AppendingVars, ErrorMsg)) return true; 7415c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 742c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link the functions together between the two modules, without doing function 743c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // bodies... this just adds external function prototypes to the Dest 744c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // function... We do this so that when we begin processing function bodies, 745c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // all of the global values that may be referenced are available in our 746c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // ValueMap. 7475c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 74879df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner if (LinkFunctionProtos(Dest, Src, ValueMap, ErrorMsg)) return true; 7495c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 7506cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // Update the initializers in the Dest module now that all globals that may 7516cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // be referenced are in Dest. 7526cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // 7536cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner if (LinkGlobalInits(Dest, Src, ValueMap, ErrorMsg)) return true; 7546cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner 755c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link in the function bodies that are defined in the source module into the 756c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // DestModule. This consists basically of copying the function over and 757c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // fixing up references to values. 7585c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 75979df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner if (LinkFunctionBodies(Dest, Src, ValueMap, ErrorMsg)) return true; 76052f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 7618166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If there were any appending global variables, link them together now. 7628166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // 7638166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (LinkAppendingVars(Dest, AppendingVars, ErrorMsg)) return true; 7648166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 76552f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner return false; 76652f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner} 7679466f5113ba859677a28887c3c7143065e702019Vikram S. Adve 768