LinkModules.cpp revision 9ddf2c898f5227ca137aef7abc3051e16bd60025
17f49602e5ac7186c9505a0496393dd624515b459Reid Spencer//===- lib/Linker/LinkModules.cpp - Module Linker Implementation ----------===// 2f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman// 3b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// The LLVM Compiler Infrastructure 4b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// 54ee451de366474b9c228b4e5fa573795a715216dChris Lattner// This file is distributed under the University of Illinois Open Source 64ee451de366474b9c228b4e5fa573795a715216dChris Lattner// License. See LICENSE.TXT for details. 7f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman// 8b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell//===----------------------------------------------------------------------===// 952f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// 1052f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// This file implements the LLVM module linker. 1152f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// 1252f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// Specifically, this: 138d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// * Merges global variables between the two modules 148d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// * Uninit + Uninit = Init, Init + Uninit = Init, Init + Init = Error if != 15c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// * Merges functions between two modules 1652f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// 1752f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner//===----------------------------------------------------------------------===// 1852f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 197cc371a7958c7a049c679a59023c3c8c83f6cc83Reid Spencer#include "llvm/Linker.h" 20adbc0b5287bf36893cdcae2440d48b3cb3489e38Chris Lattner#include "llvm/Constants.h" 21adbc0b5287bf36893cdcae2440d48b3cb3489e38Chris Lattner#include "llvm/DerivedTypes.h" 225c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner#include "llvm/Module.h" 2378d033e086e19e016273de014f9214aa6f3f844bReid Spencer#include "llvm/TypeSymbolTable.h" 24ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer#include "llvm/ValueSymbolTable.h" 2547b14a4a6a455c7be169cfd312fcbe796f0ad426Misha Brukman#include "llvm/Instructions.h" 26adbc0b5287bf36893cdcae2440d48b3cb3489e38Chris Lattner#include "llvm/Assembly/Writer.h" 2741edad7e4b8872414564dea5fb41fa6194375355Bill Wendling#include "llvm/Support/Streams.h" 2857a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer#include "llvm/System/Path.h" 291a097e30d39e60303ae2b19f7a56e813f3e3c18eBill Wendling#include <sstream> 30f7703df4968084c18c248c1feea9961c19a32e6aChris Lattnerusing namespace llvm; 31d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke 325c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// Error - Simple wrapper function to conditionally assign to E and return true. 335c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// This just makes error return conditions a little bit simpler... 348166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattnerstatic inline bool Error(std::string *E, const std::string &Message) { 355c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner if (E) *E = Message; 365c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return true; 375c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 385c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 39719012d6254ee425464f034250176283fb96793bReid Spencer// ToStr - Simple wrapper function to convert a type to a string. 4072cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattnerstatic std::string ToStr(const Type *Ty, const Module *M) { 4172cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattner std::ostringstream OS; 4272cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattner WriteTypeSymbolic(OS, Ty, M); 4372cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattner return OS.str(); 4472cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattner} 4572cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattner 46700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 47700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Function: ResolveTypes() 48700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 49700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Description: 50700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Attempt to link the two specified types together. 51700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 52700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Inputs: 53700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// DestTy - The type to which we wish to resolve. 54700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// SrcTy - The original type which we want to resolve. 55700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 56700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Outputs: 57700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// DestST - The symbol table in which the new type should be placed. 58700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 59700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Return value: 60700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// true - There is an error and the types cannot yet be linked. 61700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// false - No errors. 624c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner// 63bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattnerstatic bool ResolveTypes(const Type *DestTy, const Type *SrcTy) { 64e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DestTy == SrcTy) return false; // If already equal, noop 65bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner assert(DestTy && SrcTy && "Can't handle null types"); 66e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 67bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner if (const OpaqueType *OT = dyn_cast<OpaqueType>(DestTy)) { 68bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner // Type _is_ in module, just opaque... 69bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner const_cast<OpaqueType*>(OT)->refineAbstractTypeTo(SrcTy); 70bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner } else if (const OpaqueType *OT = dyn_cast<OpaqueType>(SrcTy)) { 71bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner const_cast<OpaqueType*>(OT)->refineAbstractTypeTo(DestTy); 72bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner } else { 73bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner return true; // Cannot link types... not-equal and neither is opaque. 744c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 754c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner return false; 764c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner} 774c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 78e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// RecursiveResolveTypes - This is just like ResolveTypes, except that it 79e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// recurses down into derived types, merging the used types if the parent types 80e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// are compatible. 81e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattnerstatic bool RecursiveResolveTypesI(const PATypeHolder &DestTy, 82e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner const PATypeHolder &SrcTy, 83e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner std::vector<std::pair<PATypeHolder, PATypeHolder> > &Pointers) { 8443f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner const Type *SrcTyT = SrcTy.get(); 8543f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner const Type *DestTyT = DestTy.get(); 8643f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner if (DestTyT == SrcTyT) return false; // If already equal, noop 87f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 88e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // If we found our opaque type, resolve it now! 8943f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner if (isa<OpaqueType>(DestTyT) || isa<OpaqueType>(SrcTyT)) 90bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner return ResolveTypes(DestTyT, SrcTyT); 91f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 92e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Two types cannot be resolved together if they are of different primitive 93e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // type. For example, we cannot resolve an int to a float. 94f70c22b019494723d0e706f93d6542dfaa6e73a5Chris Lattner if (DestTyT->getTypeID() != SrcTyT->getTypeID()) return true; 95e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 96e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Otherwise, resolve the used type used by this derived type... 97f70c22b019494723d0e706f93d6542dfaa6e73a5Chris Lattner switch (DestTyT->getTypeID()) { 98f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner default: 99f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner return true; 100e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::FunctionTyID: { 1019ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner const FunctionType *DstFT = cast<FunctionType>(DestTyT); 1029ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner const FunctionType *SrcFT = cast<FunctionType>(SrcTyT); 1039ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner if (DstFT->isVarArg() != SrcFT->isVarArg() || 1049ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner DstFT->getNumContainedTypes() != SrcFT->getNumContainedTypes()) 10543f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return true; 1069ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner for (unsigned i = 0, e = DstFT->getNumContainedTypes(); i != e; ++i) 1079ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner if (RecursiveResolveTypesI(DstFT->getContainedType(i), 1089ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner SrcFT->getContainedType(i), Pointers)) 109e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return true; 110e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return false; 111e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 112e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::StructTyID: { 1139ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner const StructType *DstST = cast<StructType>(DestTyT); 1149ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner const StructType *SrcST = cast<StructType>(SrcTyT); 1159ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner if (DstST->getNumContainedTypes() != SrcST->getNumContainedTypes()) 116f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner return true; 1179ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner for (unsigned i = 0, e = DstST->getNumContainedTypes(); i != e; ++i) 1189ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner if (RecursiveResolveTypesI(DstST->getContainedType(i), 1199ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner SrcST->getContainedType(i), Pointers)) 120e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return true; 121e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return false; 122e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 123e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::ArrayTyID: { 12443f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner const ArrayType *DAT = cast<ArrayType>(DestTy.get()); 12543f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner const ArrayType *SAT = cast<ArrayType>(SrcTy.get()); 126e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DAT->getNumElements() != SAT->getNumElements()) return true; 127e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner return RecursiveResolveTypesI(DAT->getElementType(), SAT->getElementType(), 128bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner Pointers); 129e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner } 130f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner case Type::VectorTyID: { 131f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner const VectorType *DVT = cast<VectorType>(DestTy.get()); 132f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner const VectorType *SVT = cast<VectorType>(SrcTy.get()); 133f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner if (DVT->getNumElements() != SVT->getNumElements()) return true; 134f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner return RecursiveResolveTypesI(DVT->getElementType(), SVT->getElementType(), 135f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner Pointers); 136f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner } 137e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner case Type::PointerTyID: { 1389ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner const PointerType *DstPT = cast<PointerType>(DestTy.get()); 1399ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner const PointerType *SrcPT = cast<PointerType>(SrcTy.get()); 1409ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner 1419ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner if (DstPT->getAddressSpace() != SrcPT->getAddressSpace()) 1429ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner return true; 1439ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner 144e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // If this is a pointer type, check to see if we have already seen it. If 145e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // so, we are in a recursive branch. Cut off the search now. We cannot use 146e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // an associative container for this search, because the type pointers (keys 147e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // in the container) change whenever types get resolved... 148e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner for (unsigned i = 0, e = Pointers.size(); i != e; ++i) 149e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner if (Pointers[i].first == DestTy) 150e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner return Pointers[i].second != SrcTy; 151e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner 152e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // Otherwise, add the current pointers to the vector to stop recursion on 153e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // this pair. 154e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner Pointers.push_back(std::make_pair(DestTyT, SrcTyT)); 1559ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner return RecursiveResolveTypesI(DstPT->getElementType(), 1569ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner SrcPT->getElementType(), Pointers); 157e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 158f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman } 159e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner} 160e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 161e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattnerstatic bool RecursiveResolveTypes(const PATypeHolder &DestTy, 162bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner const PATypeHolder &SrcTy) { 163e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner std::vector<std::pair<PATypeHolder, PATypeHolder> > PointerTypes; 164bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner return RecursiveResolveTypesI(DestTy, SrcTy, PointerTypes); 165e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner} 166e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner 167e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 1682c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// LinkTypes - Go through the symbol table of the Src module and see if any 1692c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// types are named in the src module that are not named in the Dst module. 1702c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// Make sure there are no type name conflicts. 1715c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic bool LinkTypes(Module *Dest, const Module *Src, std::string *Err) { 17278d033e086e19e016273de014f9214aa6f3f844bReid Spencer TypeSymbolTable *DestST = &Dest->getTypeSymbolTable(); 17378d033e086e19e016273de014f9214aa6f3f844bReid Spencer const TypeSymbolTable *SrcST = &Src->getTypeSymbolTable(); 1742c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 1752c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Look for a type plane for Type's... 17678d033e086e19e016273de014f9214aa6f3f844bReid Spencer TypeSymbolTable::const_iterator TI = SrcST->begin(); 17778d033e086e19e016273de014f9214aa6f3f844bReid Spencer TypeSymbolTable::const_iterator TE = SrcST->end(); 178567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer if (TI == TE) return false; // No named types, do nothing. 1792c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 180cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // Some types cannot be resolved immediately because they depend on other 181cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // types being resolved to each other first. This contains a list of types we 182cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // are waiting to recheck. 1834c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner std::vector<std::string> DelayedTypesToResolve; 1844c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 185567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer for ( ; TI != TE; ++TI ) { 186567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer const std::string &Name = TI->first; 187c28a224c68adf0464c275778af4bce762ad25d37Reid Spencer const Type *RHS = TI->second; 1882c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 189bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner // Check to see if this type name is already in the dest module. 19078d033e086e19e016273de014f9214aa6f3f844bReid Spencer Type *Entry = DestST->lookup(Name); 1914c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 192bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner // If the name is just in the source module, bring it over to the dest. 193bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner if (Entry == 0) { 194bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner if (!Name.empty()) 195bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner DestST->insert(Name, const_cast<Type*>(RHS)); 196bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner } else if (ResolveTypes(Entry, RHS)) { 1974c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // They look different, save the types 'till later to resolve. 1984c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner DelayedTypesToResolve.push_back(Name); 1994c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 2004c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 2014c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 2024c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Iteratively resolve types while we can... 2034c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner while (!DelayedTypesToResolve.empty()) { 2044c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Loop over all of the types, attempting to resolve them if possible... 2054c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner unsigned OldSize = DelayedTypesToResolve.size(); 2064c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 207e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Try direct resolution by name... 2084c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner for (unsigned i = 0; i != DelayedTypesToResolve.size(); ++i) { 2094c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner const std::string &Name = DelayedTypesToResolve[i]; 21078d033e086e19e016273de014f9214aa6f3f844bReid Spencer Type *T1 = SrcST->lookup(Name); 21178d033e086e19e016273de014f9214aa6f3f844bReid Spencer Type *T2 = DestST->lookup(Name); 212bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner if (!ResolveTypes(T2, T1)) { 2134c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // We are making progress! 2144c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i); 2154c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner --i; 2162f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner } 2174c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 2182f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner 2194c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Did we not eliminate any types? 2204c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (DelayedTypesToResolve.size() == OldSize) { 221e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Attempt to resolve subelements of types. This allows us to merge these 222e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // two types: { int* } and { opaque* } 2234c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner for (unsigned i = 0, e = DelayedTypesToResolve.size(); i != e; ++i) { 2244c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner const std::string &Name = DelayedTypesToResolve[i]; 22578d033e086e19e016273de014f9214aa6f3f844bReid Spencer PATypeHolder T1(SrcST->lookup(Name)); 22678d033e086e19e016273de014f9214aa6f3f844bReid Spencer PATypeHolder T2(DestST->lookup(Name)); 227e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 228bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner if (!RecursiveResolveTypes(T2, T1)) { 229e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // We are making progress! 230e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i); 231f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 232e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Go back to the main loop, perhaps we can resolve directly by name 233e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // now... 234e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner break; 235e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 236e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 237e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 238e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // If we STILL cannot resolve the types, then there is something wrong. 239e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DelayedTypesToResolve.size() == OldSize) { 240aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner // Remove the symbol name from the destination. 241aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner DelayedTypesToResolve.pop_back(); 2424c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 2432c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner } 2442c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner } 2454c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 2464c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 2472c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner return false; 2482c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner} 2492c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 2505c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic void PrintMap(const std::map<const Value*, Value*> &M) { 2515c2d335d86579941b71816196a95a64b277e8963Chris Lattner for (std::map<const Value*, Value*>::const_iterator I = M.begin(), E =M.end(); 2522d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner I != E; ++I) { 253e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << " Fr: " << (void*)I->first << " "; 25487182ae6baf28ca6da6ee4bc00cf1857f293acfeChris Lattner I->first->dump(); 255e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << " To: " << (void*)I->second << " "; 25687182ae6baf28ca6da6ee4bc00cf1857f293acfeChris Lattner I->second->dump(); 257e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << "\n"; 2582d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner } 2592d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner} 2602d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 2612d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 262619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer// RemapOperand - Use ValueMap to convert constants from one module to another. 2635c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic Value *RemapOperand(const Value *In, 2640033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner std::map<const Value*, Value*> &ValueMap) { 2650033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner std::map<const Value*,Value*>::const_iterator I = ValueMap.find(In); 266ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (I != ValueMap.end()) 267ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer return I->second; 2685c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 269619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer // Check to see if it's a constant that we are interested in transforming. 270620fd68b1086b4d99b23951357299bee357aa62aChris Lattner Value *Result = 0; 27118961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (const Constant *CPV = dyn_cast<Constant>(In)) { 272de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if ((!isa<DerivedType>(CPV->getType()) && !isa<ConstantExpr>(CPV)) || 273a54b7cbd452b3adb2f51346140d996b29c2cdb30Reid Spencer isa<ConstantInt>(CPV) || isa<ConstantAggregateZero>(CPV)) 2740033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner return const_cast<Constant*>(CPV); // Simple constants stay identical. 2758d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 27618961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (const ConstantArray *CPA = dyn_cast<ConstantArray>(CPV)) { 277cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos std::vector<Constant*> Operands(CPA->getNumOperands()); 278cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i) 2790033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner Operands[i] =cast<Constant>(RemapOperand(CPA->getOperand(i), ValueMap)); 280e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Result = ConstantArray::get(cast<ArrayType>(CPA->getType()), Operands); 28118961504fc2b299578dba817900a0696cf3ccc4dChris Lattner } else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(CPV)) { 282cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos std::vector<Constant*> Operands(CPS->getNumOperands()); 283cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i) 2840033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner Operands[i] =cast<Constant>(RemapOperand(CPS->getOperand(i), ValueMap)); 285e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Result = ConstantStruct::get(cast<StructType>(CPS->getType()), Operands); 286b976e668165e1875a8f1eb7af800e33bb1e4393dChris Lattner } else if (isa<ConstantPointerNull>(CPV) || isa<UndefValue>(CPV)) { 28718961504fc2b299578dba817900a0696cf3ccc4dChris Lattner Result = const_cast<Constant*>(CPV); 2889d6565a5b1fbc4286d6ee638d8f47a3171a9ed7eReid Spencer } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CPV)) { 289a88eb9287eb14ba62ca6324b2b249e0ae9fe3309Chris Lattner std::vector<Constant*> Operands(CP->getNumOperands()); 290a88eb9287eb14ba62ca6324b2b249e0ae9fe3309Chris Lattner for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i) 291a88eb9287eb14ba62ca6324b2b249e0ae9fe3309Chris Lattner Operands[i] = cast<Constant>(RemapOperand(CP->getOperand(i), ValueMap)); 2929d6565a5b1fbc4286d6ee638d8f47a3171a9ed7eReid Spencer Result = ConstantVector::get(Operands); 2936cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) { 29427d672136a57519095a3ef20161697749cffb57cChris Lattner std::vector<Constant*> Ops; 29527d672136a57519095a3ef20161697749cffb57cChris Lattner for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) 29627d672136a57519095a3ef20161697749cffb57cChris Lattner Ops.push_back(cast<Constant>(RemapOperand(CE->getOperand(i),ValueMap))); 29727d672136a57519095a3ef20161697749cffb57cChris Lattner Result = CE->getWithOperands(Ops); 298619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer } else if (isa<GlobalValue>(CPV)) { 299619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer assert(0 && "Unmapped global?"); 3008d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } else { 3018d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner assert(0 && "Unknown type of derived type constant value!"); 3028d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 303620fd68b1086b4d99b23951357299bee357aa62aChris Lattner } else if (isa<InlineAsm>(In)) { 304620fd68b1086b4d99b23951357299bee357aa62aChris Lattner Result = const_cast<Value*>(In); 305620fd68b1086b4d99b23951357299bee357aa62aChris Lattner } 306620fd68b1086b4d99b23951357299bee357aa62aChris Lattner 307619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer // Cache the mapping in our local map structure 308620fd68b1086b4d99b23951357299bee357aa62aChris Lattner if (Result) { 309817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[In] = Result; 3108d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return Result; 3118d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 3128bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer 3132d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 314e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << "LinkModules ValueMap: \n"; 3150033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner PrintMap(ValueMap); 3162d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 317e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << "Couldn't remap value: " << (void*)In << " " << *In << "\n"; 3188d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner assert(0 && "Couldn't remap value!"); 3198d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return 0; 3205c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 3215c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 3228bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer/// ForceRenaming - The LLVM SymbolTable class autorenames globals that conflict 3238bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer/// in the symbol table. This is good for all clients except for us. Go 3248bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer/// through the trouble to force this back. 325c003628a612d3687fb77088a5894314210a65385Chris Lattnerstatic void ForceRenaming(GlobalValue *GV, const std::string &Name) { 326c003628a612d3687fb77088a5894314210a65385Chris Lattner assert(GV->getName() != Name && "Can't force rename to self"); 327ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ValueSymbolTable &ST = GV->getParent()->getValueSymbolTable(); 328c003628a612d3687fb77088a5894314210a65385Chris Lattner 329c003628a612d3687fb77088a5894314210a65385Chris Lattner // If there is a conflict, rename the conflict. 33033f294930e0affa51c3818405741abd80cc90316Chris Lattner if (GlobalValue *ConflictGV = cast_or_null<GlobalValue>(ST.lookup(Name))) { 331ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer assert(ConflictGV->hasInternalLinkage() && 332ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer "Not conflicting with a static global, should link instead!"); 33333f294930e0affa51c3818405741abd80cc90316Chris Lattner GV->takeName(ConflictGV); 33433f294930e0affa51c3818405741abd80cc90316Chris Lattner ConflictGV->setName(Name); // This will cause ConflictGV to get renamed 335ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer assert(ConflictGV->getName() != Name && "ForceRenaming didn't work"); 33633f294930e0affa51c3818405741abd80cc90316Chris Lattner } else { 33733f294930e0affa51c3818405741abd80cc90316Chris Lattner GV->setName(Name); // Force the name back 338ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer } 339ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer} 340ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer 341ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer/// CopyGVAttributes - copy additional attributes (those not needed to construct 342ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer/// a GlobalValue) from the SrcGV to the DestGV. 343ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencerstatic void CopyGVAttributes(GlobalValue *DestGV, const GlobalValue *SrcGV) { 34428c3cff8250b3fe2adc6479306fe7dbdb48a1bdbDuncan Sands // Use the maximum alignment, rather than just copying the alignment of SrcGV. 34528c3cff8250b3fe2adc6479306fe7dbdb48a1bdbDuncan Sands unsigned Alignment = std::max(DestGV->getAlignment(), SrcGV->getAlignment()); 34628c3cff8250b3fe2adc6479306fe7dbdb48a1bdbDuncan Sands DestGV->copyAttributesFrom(SrcGV); 34728c3cff8250b3fe2adc6479306fe7dbdb48a1bdbDuncan Sands DestGV->setAlignment(Alignment); 348c003628a612d3687fb77088a5894314210a65385Chris Lattner} 349c003628a612d3687fb77088a5894314210a65385Chris Lattner 350aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// GetLinkageResult - This analyzes the two global values and determines what 351aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// the result will look like in the destination module. In particular, it 352aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// computes the resultant linkage type, computes whether the global in the 353aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// source should be copied over to the destination (replacing the existing 3549cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov/// one), and computes whether this linkage is an error or not. It also performs 3559cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov/// visibility checks: we cannot link together two symbols with different 3569cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov/// visibilities. 357968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikovstatic bool GetLinkageResult(GlobalValue *Dest, const GlobalValue *Src, 358aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner GlobalValue::LinkageTypes <, bool &LinkFromSrc, 359aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner std::string *Err) { 360aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner assert((!Dest || !Src->hasInternalLinkage()) && 361aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "If Src has internal linkage, Dest shouldn't be set!"); 362aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (!Dest) { 363aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // Linking something to nothing. 364aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 365aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 3665cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer } else if (Src->isDeclaration()) { 3672b48ef0450944c2c46633aec9baf6be835a3b503Anton Korobeynikov // If Src is external or if both Src & Dest are external.. Just link the 368aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // external globals, we aren't adding anything. 369b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov if (Src->hasDLLImportLinkage()) { 37078ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // If one of GVs has DLLImport linkage, result should be dllimport'ed. 3715cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer if (Dest->isDeclaration()) { 372b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LinkFromSrc = true; 373b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LT = Src->getLinkage(); 374b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } 3758753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth } else if (Dest->hasExternalWeakLinkage()) { 3768753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth //If the Dest is weak, use the source linkage 3778753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth LinkFromSrc = true; 3788753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth LT = Src->getLinkage(); 379b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } else { 380b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LinkFromSrc = false; 381b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LT = Dest->getLinkage(); 382b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } 3835cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer } else if (Dest->isDeclaration() && !Dest->hasDLLImportLinkage()) { 384aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // If Dest is external but Src is not: 385aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 386aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 387aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else if (Src->hasAppendingLinkage() || Dest->hasAppendingLinkage()) { 388aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (Src->getLinkage() != Dest->getLinkage()) 389aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner return Error(Err, "Linking globals named '" + Src->getName() + 390aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "': can only link appending global with another appending global!"); 391aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; // Special cased. 392aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 393aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen } else if (Src->hasWeakLinkage() || Src->hasLinkOnceLinkage() || 394aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen Src->hasCommonLinkage()) { 395aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen // At this point we know that Dest has LinkOnce, External*, Weak, Common, 396aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen // or DLL* linkage. 397aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen if ((Dest->hasLinkOnceLinkage() && 398aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen (Src->hasWeakLinkage() || Src->hasCommonLinkage())) || 39978ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Dest->hasExternalWeakLinkage()) { 400aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 401aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 402aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else { 403aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = false; 404aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Dest->getLinkage(); 405aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 406aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen } else if (Dest->hasWeakLinkage() || Dest->hasLinkOnceLinkage() || 407aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen Dest->hasCommonLinkage()) { 40878ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // At this point we know that Src has External* or DLL* linkage. 40978ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov if (Src->hasExternalWeakLinkage()) { 41078ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LinkFromSrc = false; 41178ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LT = Dest->getLinkage(); 41278ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov } else { 41378ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LinkFromSrc = true; 41478ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LT = GlobalValue::ExternalLinkage; 41578ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov } 416aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else { 417b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov assert((Dest->hasExternalLinkage() || 418b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov Dest->hasDLLImportLinkage() || 41978ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Dest->hasDLLExportLinkage() || 42078ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Dest->hasExternalWeakLinkage()) && 421b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov (Src->hasExternalLinkage() || 422b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov Src->hasDLLImportLinkage() || 42378ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Src->hasDLLExportLinkage() || 42478ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Src->hasExternalWeakLinkage()) && 425aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "Unexpected linkage type!"); 426f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman return Error(Err, "Linking globals named '" + Src->getName() + 427aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "': symbol multiply defined!"); 428aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 4299cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov 4309cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov // Check visibility 4319cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov if (Dest && Src->getVisibility() != Dest->getVisibility()) 43297f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner if (!Src->isDeclaration() && !Dest->isDeclaration()) 43397f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner return Error(Err, "Linking globals named '" + Src->getName() + 43497f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner "': symbols have different visibilities!"); 435aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner return false; 436aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner} 4375c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4385c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// LinkGlobals - Loop through the global variables in the src module and merge 4398166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// them into the dest module. 440968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikovstatic bool LinkGlobals(Module *Dest, const Module *Src, 4415c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 4428166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 4435c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 4445c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 445968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov for (Module::const_global_iterator I = Src->global_begin(), E = Src->global_end(); 4461127315562b221010040925980040fd4f65bdb1cChris Lattner I != E; ++I) { 447968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov const GlobalVariable *SGV = I; 44801f69399352380532d480f6749daed660f50b15cAnton Korobeynikov GlobalValue *DGV = 0; 44901f69399352380532d480f6749daed660f50b15cAnton Korobeynikov 45001f69399352380532d480f6749daed660f50b15cAnton Korobeynikov // Check to see if may have to link the global with the global 451ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (SGV->hasName() && !SGV->hasInternalLinkage()) { 452ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer DGV = Dest->getGlobalVariable(SGV->getName()); 453ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (DGV && DGV->getType() != SGV->getType()) 454ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // If types don't agree due to opaque types, try to resolve them. 455bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner RecursiveResolveTypes(SGV->getType(), DGV->getType()); 456ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer } 4575c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 45801f69399352380532d480f6749daed660f50b15cAnton Korobeynikov // Check to see if may have to link the global with the alias 459aeb09967fdb2ff074c91ce8039ebd1917a2f6060Anton Korobeynikov if (!DGV && SGV->hasName() && !SGV->hasInternalLinkage()) { 46001f69399352380532d480f6749daed660f50b15cAnton Korobeynikov DGV = Dest->getNamedAlias(SGV->getName()); 46101f69399352380532d480f6749daed660f50b15cAnton Korobeynikov if (DGV && DGV->getType() != SGV->getType()) 46201f69399352380532d480f6749daed660f50b15cAnton Korobeynikov // If types don't agree due to opaque types, try to resolve them. 463bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner RecursiveResolveTypes(SGV->getType(), DGV->getType()); 46401f69399352380532d480f6749daed660f50b15cAnton Korobeynikov } 46501f69399352380532d480f6749daed660f50b15cAnton Korobeynikov 466aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (DGV && DGV->hasInternalLinkage()) 467aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner DGV = 0; 468aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner 469c318329a1098a19137398af4d880f4d8cdd9cd8dDan Gohman assert((SGV->hasInitializer() || SGV->hasExternalWeakLinkage() || 470c318329a1098a19137398af4d880f4d8cdd9cd8dDan Gohman SGV->hasExternalLinkage() || SGV->hasDLLImportLinkage()) && 4714ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner "Global must either be external or have an initializer!"); 4725c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 473b324bd735ff5c99a52cd3c3f5d01c0e1398a2d3aChris Lattner GlobalValue::LinkageTypes NewLinkage = GlobalValue::InternalLinkage; 474b324bd735ff5c99a52cd3c3f5d01c0e1398a2d3aChris Lattner bool LinkFromSrc = false; 475aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (GetLinkageResult(DGV, SGV, NewLinkage, LinkFromSrc, Err)) 476aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner return true; 4770fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner 478aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (!DGV) { 4795c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // No linking to be performed, simply create an identical version of the 4808d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // symbol over in the dest module... the initializer will be filled in 4818d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // later by LinkGlobalInits... 4822719bac90525985f4ebb97324b4c087d47b54384Chris Lattner GlobalVariable *NewDGV = 4832719bac90525985f4ebb97324b4c087d47b54384Chris Lattner new GlobalVariable(SGV->getType()->getElementType(), 4842719bac90525985f4ebb97324b4c087d47b54384Chris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 485e20c814518e3322f5bf5f83e9ca42bd6bdd40745Anton Korobeynikov SGV->getName(), Dest); 486471feac1b297b9458de18d973af371bf7f10296bReid Spencer // Propagate alignment, visibility and section info. 487ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer CopyGVAttributes(NewDGV, SGV); 4885dfbaf1fe3fa6914095cc55cde20b1ed25187b56Andrew Lenharth 4892719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // If the LLVM runtime renamed the global, but it is an externally visible 4902719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // symbol, DGV must be an existing global with internal linkage. Rename 4912719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // it. 492c003628a612d3687fb77088a5894314210a65385Chris Lattner if (NewDGV->getName() != SGV->getName() && !NewDGV->hasInternalLinkage()) 493c003628a612d3687fb77088a5894314210a65385Chris Lattner ForceRenaming(NewDGV, SGV->getName()); 4945c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4955c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Make sure to remember this mapping... 496817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[SGV] = NewDGV; 497817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov 4988166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (SGV->hasAppendingLinkage()) 4998166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Keep track that this is an appending variable... 5008166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV)); 501aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else if (DGV->hasAppendingLinkage()) { 5028166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // No linking is performed yet. Just insert a new copy of the global, and 5038166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // keep track of the fact that it is an appending variable in the 5048166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars map. The name is cleared out so that no linkage is 5058166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // performed. 5068166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NewDGV = 5078166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner new GlobalVariable(SGV->getType()->getElementType(), 5088166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 509e20c814518e3322f5bf5f83e9ca42bd6bdd40745Anton Korobeynikov "", Dest); 5108166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 51175c7915c3a24f8063c274ccffe2dc9b7bc8bce1fAnton Korobeynikov // Set alignment allowing CopyGVAttributes merge it with alignment of SGV. 512ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer NewDGV->setAlignment(DGV->getAlignment()); 51375c7915c3a24f8063c274ccffe2dc9b7bc8bce1fAnton Korobeynikov // Propagate alignment, section and visibility info. 514ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer CopyGVAttributes(NewDGV, SGV); 5155dfbaf1fe3fa6914095cc55cde20b1ed25187b56Andrew Lenharth 5168166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Make sure to remember this mapping... 517817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[SGV] = NewDGV; 5188166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 5198166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Keep track that this is an appending variable... 5208166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV)); 52101f69399352380532d480f6749daed660f50b15cAnton Korobeynikov } else if (GlobalAlias *DGA = dyn_cast<GlobalAlias>(DGV)) { 52201f69399352380532d480f6749daed660f50b15cAnton Korobeynikov // SGV is global, but DGV is alias. The only valid mapping is when SGV is 52301f69399352380532d480f6749daed660f50b15cAnton Korobeynikov // external declaration, which is effectively a no-op. Also make sure 524817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov // linkage calculation was correct. 52501f69399352380532d480f6749daed660f50b15cAnton Korobeynikov if (SGV->isDeclaration() && !LinkFromSrc) { 52601f69399352380532d480f6749daed660f50b15cAnton Korobeynikov // Make sure to remember this mapping... 527817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[SGV] = DGA; 52801f69399352380532d480f6749daed660f50b15cAnton Korobeynikov } else 5291438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Global-Alias Collision on '" + SGV->getName() + 5301438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': symbol multiple defined"); 53101f69399352380532d480f6749daed660f50b15cAnton Korobeynikov } else if (GlobalVariable *DGVar = dyn_cast<GlobalVariable>(DGV)) { 532817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov // Otherwise, perform the global-global mapping as instructed by 533817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov // GetLinkageResult. 534aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (LinkFromSrc) { 535968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov // Propagate alignment, section, and visibility info. 53601f69399352380532d480f6749daed660f50b15cAnton Korobeynikov CopyGVAttributes(DGVar, SGV); 537968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov 538968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov // If the types don't match, and if we are to link from the source, nuke 539968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov // DGV and create a new one of the appropriate type. 54001f69399352380532d480f6749daed660f50b15cAnton Korobeynikov if (SGV->getType() != DGVar->getType()) { 541968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov GlobalVariable *NewDGV = 542968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov new GlobalVariable(SGV->getType()->getElementType(), 54301f69399352380532d480f6749daed660f50b15cAnton Korobeynikov DGVar->isConstant(), DGVar->getLinkage(), 54401f69399352380532d480f6749daed660f50b15cAnton Korobeynikov /*init*/0, DGVar->getName(), Dest); 54501f69399352380532d480f6749daed660f50b15cAnton Korobeynikov CopyGVAttributes(NewDGV, DGVar); 546968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov DGV->replaceAllUsesWith(ConstantExpr::getBitCast(NewDGV, 54701f69399352380532d480f6749daed660f50b15cAnton Korobeynikov DGVar->getType())); 54801f69399352380532d480f6749daed660f50b15cAnton Korobeynikov // DGVar will conflict with NewDGV because they both had the same 549968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov // name. We must erase this now so ForceRenaming doesn't assert 550968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov // because DGV might not have internal linkage. 55101f69399352380532d480f6749daed660f50b15cAnton Korobeynikov DGVar->eraseFromParent(); 552968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov 553968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov // If the symbol table renamed the global, but it is an externally 554968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov // visible symbol, DGV must be an existing global with internal 555968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov // linkage. Rename it. 556968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov if (NewDGV->getName() != SGV->getName() && 557968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov !NewDGV->hasInternalLinkage()) 558968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov ForceRenaming(NewDGV, SGV->getName()); 559968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov 56001f69399352380532d480f6749daed660f50b15cAnton Korobeynikov DGVar = NewDGV; 561968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov } 562968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov 563aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // Inherit const as appropriate 56401f69399352380532d480f6749daed660f50b15cAnton Korobeynikov DGVar->setConstant(SGV->isConstant()); 565968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov 566968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov // Set initializer to zero, so we can link the stuff later 56701f69399352380532d480f6749daed660f50b15cAnton Korobeynikov DGVar->setInitializer(0); 568aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else { 569968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov // Special case for const propagation 57001f69399352380532d480f6749daed660f50b15cAnton Korobeynikov if (DGVar->isDeclaration() && SGV->isConstant() && !DGVar->isConstant()) 57101f69399352380532d480f6749daed660f50b15cAnton Korobeynikov DGVar->setConstant(true); 572aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 573aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner 574968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov // Set calculated linkage 57501f69399352380532d480f6749daed660f50b15cAnton Korobeynikov DGVar->setLinkage(NewLinkage); 576968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov 577968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov // Make sure to remember this mapping... 578817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[SGV] = ConstantExpr::getBitCast(DGVar, SGV->getType()); 5795c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 5805c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 5815c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 5825c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 5835c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 58458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikovstatic GlobalValue::LinkageTypes 58558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton KorobeynikovCalculateAliasLinkage(const GlobalValue *SGV, const GlobalValue *DGV) { 58658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov if (SGV->hasExternalLinkage() || DGV->hasExternalLinkage()) 58758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov return GlobalValue::ExternalLinkage; 58858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov else if (SGV->hasWeakLinkage() || DGV->hasWeakLinkage()) 58958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov return GlobalValue::WeakLinkage; 59058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov else { 59158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov assert(SGV->hasInternalLinkage() && DGV->hasInternalLinkage() && 59258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov "Unexpected linkage type"); 59358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov return GlobalValue::InternalLinkage; 59458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } 59558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov} 59658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 59731ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio// LinkAlias - Loop through the alias in the src module and link them into the 59858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov// dest module. We're assuming, that all functions/global variables were already 59958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov// linked in. 6004fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikovstatic bool LinkAlias(Module *Dest, const Module *Src, 6014fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov std::map<const Value*, Value*> &ValueMap, 6024fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov std::string *Err) { 60331ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio // Loop over all alias in the src module 60431ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio for (Module::const_alias_iterator I = Src->alias_begin(), 60531ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio E = Src->alias_end(); I != E; ++I) { 60658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov const GlobalAlias *SGA = I; 60758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov const GlobalValue *SAliasee = SGA->getAliasedGlobal(); 60858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov GlobalAlias *NewGA = NULL; 60958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 61058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Globals were already linked, thus we can just query ValueMap for variant 611caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // of SAliasee in Dest. 61258d5e051574339106ce4139697ebadd21e34dbc0Ted Kremenek std::map<const Value*,Value*>::const_iterator VMI = ValueMap.find(SAliasee); 61358d5e051574339106ce4139697ebadd21e34dbc0Ted Kremenek assert(VMI != ValueMap.end() && "Aliasee not linked"); 61458d5e051574339106ce4139697ebadd21e34dbc0Ted Kremenek GlobalValue* DAliasee = cast<GlobalValue>(VMI->second); 615caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov GlobalValue* DGV = NULL; 61658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 61758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Try to find something 'similar' to SGA in destination module. 618caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (!DGV && !SGA->hasInternalLinkage()) { 619caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGV = Dest->getNamedAlias(SGA->getName()); 620caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 621caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // If types don't agree due to opaque types, try to resolve them. 622caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (DGV && DGV->getType() != SGA->getType()) 623bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner if (RecursiveResolveTypes(SGA->getType(), DGV->getType())) 624caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov return Error(Err, "Alias Collision on '" + SGA->getName()+ 625caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov "': aliases have different types"); 626caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } 627caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 628caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (!DGV && !SGA->hasInternalLinkage()) { 629caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGV = Dest->getGlobalVariable(SGA->getName()); 630caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 63158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // If types don't agree due to opaque types, try to resolve them. 632caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (DGV && DGV->getType() != SGA->getType()) 633bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner if (RecursiveResolveTypes(SGA->getType(), DGV->getType())) 634caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov return Error(Err, "Alias Collision on '" + SGA->getName()+ 635caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov "': aliases have different types"); 636caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } 63758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 638caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (!DGV && !SGA->hasInternalLinkage()) { 639caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGV = Dest->getFunction(SGA->getName()); 640caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 641caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // If types don't agree due to opaque types, try to resolve them. 642caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (DGV && DGV->getType() != SGA->getType()) 643bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner if (RecursiveResolveTypes(SGA->getType(), DGV->getType())) 644caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov return Error(Err, "Alias Collision on '" + SGA->getName()+ 645caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov "': aliases have different types"); 646caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } 647caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 648caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // No linking to be performed on internal stuff. 649caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (DGV && DGV->hasInternalLinkage()) 650caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGV = NULL; 651caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 652caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (GlobalAlias *DGA = dyn_cast_or_null<GlobalAlias>(DGV)) { 653caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // Types are known to be the same, check whether aliasees equal. As 65458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // globals are already linked we just need query ValueMap to find the 65558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // mapping. 65658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov if (DAliasee == DGA->getAliasedGlobal()) { 65758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // This is just two copies of the same alias. Propagate linkage, if 65858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // necessary. 65958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov DGA->setLinkage(CalculateAliasLinkage(SGA, DGA)); 66058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 66158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov NewGA = DGA; 66258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Proceed to 'common' steps 66358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } else 6641438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Alias Collision on '" + SGA->getName()+ 6651438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': aliases have different aliasees"); 666caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } else if (GlobalVariable *DGVar = dyn_cast_or_null<GlobalVariable>(DGV)) { 66758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // The only allowed way is to link alias with external declaration. 668caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (DGVar->isDeclaration()) { 669ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov // But only if aliasee is global too... 670ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov if (!isa<GlobalVariable>(DAliasee)) 671caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov return Error(Err, "Global-Alias Collision on '" + SGA->getName() + 672caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov "': aliasee is not global variable"); 673ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov 67458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov NewGA = new GlobalAlias(SGA->getType(), SGA->getLinkage(), 67558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov SGA->getName(), DAliasee, Dest); 67658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov CopyGVAttributes(NewGA, SGA); 67758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 67858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Any uses of DGV need to change to NewGA, with cast, if needed. 679caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (SGA->getType() != DGVar->getType()) 680caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGVar->replaceAllUsesWith(ConstantExpr::getBitCast(NewGA, 681caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGVar->getType())); 68258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov else 683caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGVar->replaceAllUsesWith(NewGA); 68458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 685caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // DGVar will conflict with NewGA because they both had the same 68658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // name. We must erase this now so ForceRenaming doesn't assert 68758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // because DGV might not have internal linkage. 688caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGVar->eraseFromParent(); 68958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 69058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Proceed to 'common' steps 69158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } else 6921438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Global-Alias Collision on '" + SGA->getName() + 6931438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': symbol multiple defined"); 694caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } else if (Function *DF = dyn_cast_or_null<Function>(DGV)) { 695b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // The only allowed way is to link alias with external declaration. 696b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov if (DF->isDeclaration()) { 697ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov // But only if aliasee is function too... 698ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov if (!isa<Function>(DAliasee)) 699caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov return Error(Err, "Function-Alias Collision on '" + SGA->getName() + 700caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov "': aliasee is not function"); 701ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov 702b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov NewGA = new GlobalAlias(SGA->getType(), SGA->getLinkage(), 703b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov SGA->getName(), DAliasee, Dest); 704b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov CopyGVAttributes(NewGA, SGA); 705b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov 706b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // Any uses of DF need to change to NewGA, with cast, if needed. 707b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov if (SGA->getType() != DF->getType()) 708b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov DF->replaceAllUsesWith(ConstantExpr::getBitCast(NewGA, 709b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov DF->getType())); 710b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov else 711b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov DF->replaceAllUsesWith(NewGA); 712b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov 713b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // DF will conflict with NewGA because they both had the same 714b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // name. We must erase this now so ForceRenaming doesn't assert 715b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // because DF might not have internal linkage. 716b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov DF->eraseFromParent(); 717b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov 718b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // Proceed to 'common' steps 719b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov } else 7201438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Function-Alias Collision on '" + SGA->getName() + 7211438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': symbol multiple defined"); 72258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } else { 723caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // No linking to be performed, simply create an identical version of the 724caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // alias over in the dest module... 72558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 72658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov NewGA = new GlobalAlias(SGA->getType(), SGA->getLinkage(), 72758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov SGA->getName(), DAliasee, Dest); 72858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov CopyGVAttributes(NewGA, SGA); 72958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 73058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Proceed to 'common' steps 73158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } 73258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 73358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov assert(NewGA && "No alias was created in destination module!"); 73458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 735b8cdaf7099898d7c0eef4769bf6a89f39e7decc2Anton Korobeynikov // If the symbol table renamed the alias, but it is an externally visible 736caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // symbol, DGA must be an global value with internal linkage. Rename it. 73758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov if (NewGA->getName() != SGA->getName() && 73858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov !NewGA->hasInternalLinkage()) 73958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov ForceRenaming(NewGA, SGA->getName()); 74058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 74158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Remember this mapping so uses in the source module get remapped 74258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // later by RemapOperand. 743817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[SGA] = NewGA; 74431ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio } 74558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 74631ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio return false; 74731ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio} 74831ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio 7495c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 7508d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// LinkGlobalInits - Update the initializers in the Dest module now that all 7518d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// globals that may be referenced are in Dest. 7528d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattnerstatic bool LinkGlobalInits(Module *Dest, const Module *Src, 7535c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 7545c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 7558d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 7568d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 7571127315562b221010040925980040fd4f65bdb1cChris Lattner for (Module::const_global_iterator I = Src->global_begin(), 7581127315562b221010040925980040fd4f65bdb1cChris Lattner E = Src->global_end(); I != E; ++I) { 75918961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const GlobalVariable *SGV = I; 7608d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 7618d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner if (SGV->hasInitializer()) { // Only process initialized GV's 7628d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Figure out what the initializer looks like in the dest module... 7634ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner Constant *SInit = 7640033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner cast<Constant>(RemapOperand(SGV->getInitializer(), ValueMap)); 7658d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 7660b12ecf6ff6b5d3a144178257b6206f0c4788792Anton Korobeynikov GlobalVariable *DGV = 7670b12ecf6ff6b5d3a144178257b6206f0c4788792Anton Korobeynikov cast<GlobalVariable>(ValueMap[SGV]->stripPointerCasts()); 7684ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (DGV->hasInitializer()) { 7694ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (SGV->hasExternalLinkage()) { 7704ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (DGV->getInitializer() != SInit) 7711438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Global Variable Collision on '" + SGV->getName() + 7721438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': global variables have different initializers"); 773aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen } else if (DGV->hasLinkOnceLinkage() || DGV->hasWeakLinkage() || 774aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen DGV->hasCommonLinkage()) { 7754ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // Nothing is required, mapped values will take the new global 7764ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // automatically. 777aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen } else if (SGV->hasLinkOnceLinkage() || SGV->hasWeakLinkage() || 778aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen SGV->hasCommonLinkage()) { 77957cb9883aa4c82357594d4186858f175135be3b1Chris Lattner // Nothing is required, mapped values will take the new global 78057cb9883aa4c82357594d4186858f175135be3b1Chris Lattner // automatically. 7814ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else if (DGV->hasAppendingLinkage()) { 7824ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(0 && "Appending linkage unimplemented!"); 7834ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else { 7844ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(0 && "Unknown linkage!"); 7854ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } 7868d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } else { 7878d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Copy the initializer over now... 7884ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner DGV->setInitializer(SInit); 7898d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 7908d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 7918d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 7928d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return false; 7938d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner} 7945c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 79579df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner// LinkFunctionProtos - Link the functions together between the two modules, 796c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// without doing function bodies... this just adds external function prototypes 797c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// to the Dest function... 7985c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 79979df7c0aaa18129e55968c8783ef8346807bd4afChris Lattnerstatic bool LinkFunctionProtos(Module *Dest, const Module *Src, 8005c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 8015c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 802619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer // Loop over all of the functions in the src module, mapping them over 8035c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner for (Module::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) { 80418961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const Function *SF = I; // SrcFunction 805824684982968244050e56357e736b9940c23e77dChris Lattner 8064ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner Function *DF = 0; 807824684982968244050e56357e736b9940c23e77dChris Lattner 808824684982968244050e56357e736b9940c23e77dChris Lattner // If this function is internal or has no name, it doesn't participate in 809824684982968244050e56357e736b9940c23e77dChris Lattner // linkage. 8108bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer if (SF->hasName() && !SF->hasInternalLinkage()) { 8118bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer // Check to see if may have to link the function. 812ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer DF = Dest->getFunction(SF->getName()); 813824684982968244050e56357e736b9940c23e77dChris Lattner if (DF && DF->hasInternalLinkage()) 814824684982968244050e56357e736b9940c23e77dChris Lattner DF = 0; 8158bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer } 816bc3d1c7e4c290a35df801000222b8f4b2d51ef20Chris Lattner 817824684982968244050e56357e736b9940c23e77dChris Lattner // If there is no linkage to be performed, just bring over SF without 818824684982968244050e56357e736b9940c23e77dChris Lattner // modifying it. 819824684982968244050e56357e736b9940c23e77dChris Lattner if (DF == 0) { 820824684982968244050e56357e736b9940c23e77dChris Lattner // Function does not already exist, simply insert an function signature 821824684982968244050e56357e736b9940c23e77dChris Lattner // identical to SF into the dest module. 822824684982968244050e56357e736b9940c23e77dChris Lattner Function *NewDF = Function::Create(SF->getFunctionType(), 823824684982968244050e56357e736b9940c23e77dChris Lattner SF->getLinkage(), 824824684982968244050e56357e736b9940c23e77dChris Lattner SF->getName(), Dest); 825824684982968244050e56357e736b9940c23e77dChris Lattner CopyGVAttributes(NewDF, SF); 826824684982968244050e56357e736b9940c23e77dChris Lattner 827824684982968244050e56357e736b9940c23e77dChris Lattner // If the LLVM runtime renamed the function, but it is an externally 828824684982968244050e56357e736b9940c23e77dChris Lattner // visible symbol, DF must be an existing function with internal linkage. 829824684982968244050e56357e736b9940c23e77dChris Lattner // Rename it. 830824684982968244050e56357e736b9940c23e77dChris Lattner if (!NewDF->hasInternalLinkage() && NewDF->getName() != SF->getName()) 831824684982968244050e56357e736b9940c23e77dChris Lattner ForceRenaming(NewDF, SF->getName()); 832824684982968244050e56357e736b9940c23e77dChris Lattner 833824684982968244050e56357e736b9940c23e77dChris Lattner // ... and remember this mapping... 834824684982968244050e56357e736b9940c23e77dChris Lattner ValueMap[SF] = NewDF; 835824684982968244050e56357e736b9940c23e77dChris Lattner continue; 836824684982968244050e56357e736b9940c23e77dChris Lattner } 837824684982968244050e56357e736b9940c23e77dChris Lattner 838824684982968244050e56357e736b9940c23e77dChris Lattner 839824684982968244050e56357e736b9940c23e77dChris Lattner // If types don't agree because of opaque, try to resolve them. 840824684982968244050e56357e736b9940c23e77dChris Lattner if (SF->getType() != DF->getType()) 841bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner RecursiveResolveTypes(SF->getType(), DF->getType()); 842824684982968244050e56357e736b9940c23e77dChris Lattner 843824684982968244050e56357e736b9940c23e77dChris Lattner // Check visibility, merging if a definition overrides a prototype. 844824684982968244050e56357e736b9940c23e77dChris Lattner if (SF->getVisibility() != DF->getVisibility()) { 84597f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner // If one is a prototype, ignore its visibility. Prototypes are always 84697f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner // overridden by the definition. 84797f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner if (!SF->isDeclaration() && !DF->isDeclaration()) 84897f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner return Error(Err, "Linking functions named '" + SF->getName() + 84997f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner "': symbols have different visibilities!"); 850bc3d1c7e4c290a35df801000222b8f4b2d51ef20Chris Lattner 851bc3d1c7e4c290a35df801000222b8f4b2d51ef20Chris Lattner // Otherwise, replace the visibility of DF if DF is a prototype. 852bc3d1c7e4c290a35df801000222b8f4b2d51ef20Chris Lattner if (DF->isDeclaration()) 853bc3d1c7e4c290a35df801000222b8f4b2d51ef20Chris Lattner DF->setVisibility(SF->getVisibility()); 85497f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner } 855ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer 856824684982968244050e56357e736b9940c23e77dChris Lattner if (DF->getType() != SF->getType()) { 857ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (DF->isDeclaration() && !SF->isDeclaration()) { 858ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // We have a definition of the same name but different type in the 859ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // source module. Copy the prototype to the destination and replace 860ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // uses of the destination's prototype with the new prototype. 861b1dbcd886a4b5597a839f299054b78b33fb2d6dfGabor Greif Function *NewDF = Function::Create(SF->getFunctionType(), 862b1dbcd886a4b5597a839f299054b78b33fb2d6dfGabor Greif SF->getLinkage(), 863051a950000e21935165db56695e35bade668193bGabor Greif SF->getName(), Dest); 864ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer CopyGVAttributes(NewDF, SF); 865ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer 866ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // Any uses of DF need to change to NewDF, with cast 867ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer DF->replaceAllUsesWith(ConstantExpr::getBitCast(NewDF, DF->getType())); 868ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer 869ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // DF will conflict with NewDF because they both had the same. We must 870ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // erase this now so ForceRenaming doesn't assert because DF might 871ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // not have internal linkage. 872ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer DF->eraseFromParent(); 873ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer 874ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // If the symbol table renamed the function, but it is an externally 875ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // visible symbol, DF must be an existing function with internal 876ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // linkage. Rename it. 877ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (NewDF->getName() != SF->getName() && !NewDF->hasInternalLinkage()) 878ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ForceRenaming(NewDF, SF->getName()); 879ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer 880ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // Remember this mapping so uses in the source module get remapped 881ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // later by RemapOperand. 882ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ValueMap[SF] = NewDF; 883ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer } else if (SF->isDeclaration()) { 884ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // We have two functions of the same name but different type and the 885ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // source is a declaration while the destination is not. Any use of 886ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // the source must be mapped to the destination, with a cast. 887ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ValueMap[SF] = ConstantExpr::getBitCast(DF, SF->getType()); 888ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer } else { 889ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // We have two functions of the same name but different types and they 890ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // are both definitions. This is an error. 891ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer return Error(Err, "Function '" + DF->getName() + "' defined as both '" + 892ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ToStr(SF->getFunctionType(), Src) + "' and '" + 893ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ToStr(DF->getFunctionType(), Dest) + "'"); 894ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer } 895824684982968244050e56357e736b9940c23e77dChris Lattner continue; 896824684982968244050e56357e736b9940c23e77dChris Lattner } 897824684982968244050e56357e736b9940c23e77dChris Lattner 898824684982968244050e56357e736b9940c23e77dChris Lattner if (SF->isDeclaration()) { 899ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // If SF is a declaration or if both SF & DF are declarations, just link 900ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // the declarations, we aren't adding anything. 901b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov if (SF->hasDLLImportLinkage()) { 9025cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer if (DF->isDeclaration()) { 903822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner ValueMap[SF] = DF; 904b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov DF->setLinkage(SF->getLinkage()); 905822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner } 906b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } else { 907817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[SF] = DF; 908822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner } 909822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner continue; 910822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner } 911822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner 912822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner // If DF is external but SF is not, link the external functions, update 913822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner // linkage qualifiers. 914822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner if (DF->isDeclaration() && !DF->hasDLLImportLinkage()) { 915c2b97d43a074445c6856d69538a95de09450c26eChris Lattner ValueMap.insert(std::make_pair(SF, DF)); 916c2b97d43a074445c6856d69538a95de09450c26eChris Lattner DF->setLinkage(SF->getLinkage()); 917822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner continue; 918822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner } 919822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner 920822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner // At this point we know that DF has LinkOnce, Weak, or External* linkage. 921822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner if (SF->hasWeakLinkage() || SF->hasLinkOnceLinkage() || 922822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner SF->hasCommonLinkage()) { 923817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[SF] = DF; 92472ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner 92535956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner // Linkonce+Weak = Weak 92678ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // *+External Weak = * 927aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen if ((DF->hasLinkOnceLinkage() && 928aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen (SF->hasWeakLinkage() || SF->hasCommonLinkage())) || 92978ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov DF->hasExternalWeakLinkage()) 93035956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner DF->setLinkage(SF->getLinkage()); 931822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner continue; 932822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner } 933822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner 934822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner if (DF->hasWeakLinkage() || DF->hasLinkOnceLinkage() || 935822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner DF->hasCommonLinkage()) { 93678ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // At this point we know that SF has LinkOnce or External* linkage. 937817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[SF] = DF; 938822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner 939822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner // If the source function has stronger linkage than the destination, 940822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner // its body and linkage should override ours. 941822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner if (!SF->hasLinkOnceLinkage() && !SF->hasExternalWeakLinkage()) { 942822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner // Don't inherit linkonce & external weak linkage. 94372ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner DF->setLinkage(SF->getLinkage()); 944822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner DF->deleteBody(); 945822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner } 946822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner continue; 947822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner } 948822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner 949822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner if (SF->getLinkage() != DF->getLinkage()) 950822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner return Error(Err, "Functions named '" + SF->getName() + 951822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner "' have different linkage specifiers!"); 952822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner 953822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner // The function is defined identically in both modules! 954822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner if (SF->hasExternalLinkage()) 955f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman return Error(Err, "Function '" + 956f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman ToStr(SF->getFunctionType(), Src) + "':\"" + 957c2b97d43a074445c6856d69538a95de09450c26eChris Lattner SF->getName() + "\" - Function is already defined!"); 958822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner assert(0 && "Unknown linkage configuration found!"); 9595c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 9605c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 9615c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 9625c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 963c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBody - Copy the source function over into the dest function and 964c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// fix up references to values. At this point we know that Dest is an external 965c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function, and that Src is not. 9664bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattnerstatic bool LinkFunctionBody(Function *Dest, Function *Src, 967ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer std::map<const Value*, Value*> &ValueMap, 9685c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 9695cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer assert(Src && Dest && Dest->isDeclaration() && !Src->isDeclaration()); 9705c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 9710033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner // Go through and convert function arguments over, remembering the mapping. 972e4d5c441e04bdc00ccf1804744af670655123b07Chris Lattner Function::arg_iterator DI = Dest->arg_begin(); 973e4d5c441e04bdc00ccf1804744af670655123b07Chris Lattner for (Function::arg_iterator I = Src->arg_begin(), E = Src->arg_end(); 97469da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner I != E; ++I, ++DI) { 9756bc41e8a74d1756da0003641bfebd02a3d6d9586Owen Anderson DI->setName(I->getName()); // Copy the name information over... 9765c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 9775c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Add a mapping to our local map 978817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[I] = DI; 9795c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 9805c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 9814bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner // Splice the body of the source function into the dest function. 9824bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner Dest->getBasicBlockList().splice(Dest->end(), Src->getBasicBlockList()); 9835c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 984c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // At this point, all of the instructions and values of the function are now 985c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // copied over. The only problem is that they are still referencing values in 986c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // the Source function as operands. Loop through all of the operands of the 987c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // functions and patch them up to point to the local versions... 9885c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 98918961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Function::iterator BB = Dest->begin(), BE = Dest->end(); BB != BE; ++BB) 99018961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) 99118961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Instruction::op_iterator OI = I->op_begin(), OE = I->op_end(); 992221d688a5ef21a22c2368c9fff0e92d7966c95e5Chris Lattner OI != OE; ++OI) 9934bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner if (!isa<Instruction>(*OI) && !isa<BasicBlock>(*OI)) 994ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer *OI = RemapOperand(*OI, ValueMap); 9950033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner 9960033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner // There is no need to map the arguments anymore. 9971127315562b221010040925980040fd4f65bdb1cChris Lattner for (Function::arg_iterator I = Src->arg_begin(), E = Src->arg_end(); 9981127315562b221010040925980040fd4f65bdb1cChris Lattner I != E; ++I) 999ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ValueMap.erase(I); 10005c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10015c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 10025c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 10035c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10045c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 1005c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBodies - Link in the function bodies that are defined in the 1006c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// source module into the DestModule. This consists basically of copying the 1007c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function over and fixing up references to values. 10084bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattnerstatic bool LinkFunctionBodies(Module *Dest, Module *Src, 10095c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 10105c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 10115c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10128bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer // Loop over all of the functions in the src module, mapping them over as we 10138bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer // go 10144bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner for (Module::iterator SF = Src->begin(), E = Src->end(); SF != E; ++SF) { 1015619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer if (!SF->isDeclaration()) { // No body if function is external 101618961504fc2b299578dba817900a0696cf3ccc4dChris Lattner Function *DF = cast<Function>(ValueMap[SF]); // Destination function 1017c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner 101818961504fc2b299578dba817900a0696cf3ccc4dChris Lattner // DF not external SF external? 1019ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (DF->isDeclaration()) 102035956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner // Only provide the function body if there isn't one already. 102135956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner if (LinkFunctionBody(DF, SF, ValueMap, Err)) 102235956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner return true; 1023c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner } 10245c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 10255c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 10265c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 10275c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10288166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// LinkAppendingVars - If there were any appending global variables, link them 10298166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// together now. Return true on error. 10308166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattnerstatic bool LinkAppendingVars(Module *M, 10318166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 10328166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::string *ErrorMsg) { 10338166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (AppendingVars.empty()) return false; // Nothing to do. 1034f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 10358166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Loop over the multimap of appending vars, processing any variables with the 10368166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // same name, forming a new appending global variable with both of the 10378166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers merged together, then rewrite references to the old variables 10388166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // and delete them. 10398166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::vector<Constant*> Inits; 10408166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner while (AppendingVars.size() > 1) { 10418166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Get the first two elements in the map... 10428166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, 10438166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable*>::iterator Second = AppendingVars.begin(), First=Second++; 10448166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 10458166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If the first two elements are for different names, there is no pair... 10468166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Otherwise there is a pair, so link them together... 10478166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (First->first == Second->first) { 10488166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *G1 = First->second, *G2 = Second->second; 10498166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T1 = cast<ArrayType>(G1->getType()->getElementType()); 10508166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T2 = cast<ArrayType>(G2->getType()->getElementType()); 1051f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 10528166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Check to see that they two arrays agree on type... 10538166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (T1->getElementType() != T2->getElementType()) 10548166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 10558166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables with different element types need to be linked!"); 10568166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (G1->isConstant() != G2->isConstant()) 10578166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 10588166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables linked with different const'ness!"); 10598166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 10609613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio if (G1->getAlignment() != G2->getAlignment()) 10619613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio return Error(ErrorMsg, 10629613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio "Appending variables with different alignment need to be linked!"); 10639613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio 10649613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio if (G1->getVisibility() != G2->getVisibility()) 10659613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio return Error(ErrorMsg, 10669613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio "Appending variables with different visibility need to be linked!"); 10679613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio 10689613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio if (G1->getSection() != G2->getSection()) 10699613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio return Error(ErrorMsg, 10709613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio "Appending variables with different section name need to be linked!"); 10719613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio 10728166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner unsigned NewSize = T1->getNumElements() + T2->getNumElements(); 10738166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner ArrayType *NewType = ArrayType::get(T1->getElementType(), NewSize); 10748166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 1075ed74a4ef3b813bed0c0f4bb5af42229d50133da2Chris Lattner G1->setName(""); // Clear G1's name in case of a conflict! 1076ed74a4ef3b813bed0c0f4bb5af42229d50133da2Chris Lattner 10778166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Create the new global variable... 10788166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NG = 10798166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner new GlobalVariable(NewType, G1->isConstant(), G1->getLinkage(), 1080c763552299165b88d34a7d4f2d76ff413cbc7f67Lauro Ramos Venancio /*init*/0, First->first, M, G1->isThreadLocal()); 10818166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 10829613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio // Propagate alignment, visibility and section info. 10839613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio CopyGVAttributes(NG, G1); 10849613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio 10858166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Merge the initializer... 10868166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.reserve(NewSize); 1087de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if (ConstantArray *I = dyn_cast<ConstantArray>(G1->getInitializer())) { 1088de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i) 1089cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos Inits.push_back(I->getOperand(i)); 1090de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } else { 1091de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner assert(isa<ConstantAggregateZero>(G1->getInitializer())); 1092de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Constant *CV = Constant::getNullValue(T1->getElementType()); 1093de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i) 1094de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(CV); 1095de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } 1096de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if (ConstantArray *I = dyn_cast<ConstantArray>(G2->getInitializer())) { 1097de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i) 1098cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos Inits.push_back(I->getOperand(i)); 1099de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } else { 1100de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner assert(isa<ConstantAggregateZero>(G2->getInitializer())); 1101de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Constant *CV = Constant::getNullValue(T2->getElementType()); 1102de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i) 1103de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(CV); 1104de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } 11058166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner NG->setInitializer(ConstantArray::get(NewType, Inits)); 11068166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.clear(); 11078166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11088166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Replace any uses of the two global variables with uses of the new 11098166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // global... 11108166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11118166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // FIXME: This should rewrite simple/straight-forward uses such as 11128166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // getelementptr instructions to not use the Cast! 11134da49122f3f3c8da68a52723d846b88c72166a68Reid Spencer G1->replaceAllUsesWith(ConstantExpr::getBitCast(NG, G1->getType())); 11144da49122f3f3c8da68a52723d846b88c72166a68Reid Spencer G2->replaceAllUsesWith(ConstantExpr::getBitCast(NG, G2->getType())); 11158166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11168166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Remove the two globals from the module now... 11178166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G1); 11188166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G2); 11198166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11208166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Put the new global into the AppendingVars map so that we can handle 11218166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // linking of more than two vars... 11228166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Second->second = NG; 11238166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 11248166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.erase(First); 11258166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 11268166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11278166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return false; 11288166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner} 112952f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 11309f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikovstatic bool ResolveAliases(Module *Dest) { 11319f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikov for (Module::alias_iterator I = Dest->alias_begin(), E = Dest->alias_end(); 11325241957b1f6876452705f94e0ed60dd2c33a5c84Anton Korobeynikov I != E; ++I) 11335241957b1f6876452705f94e0ed60dd2c33a5c84Anton Korobeynikov if (const GlobalValue *GV = I->resolveAliasedGlobal()) 11345241957b1f6876452705f94e0ed60dd2c33a5c84Anton Korobeynikov if (!GV->isDeclaration()) 11355241957b1f6876452705f94e0ed60dd2c33a5c84Anton Korobeynikov I->replaceAllUsesWith(const_cast<GlobalValue*>(GV)); 11369f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikov 11379f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikov return false; 11389f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikov} 113952f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 114052f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// LinkModules - This function links two modules together, with the resulting 114152f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// left module modified to be the composite of the two input modules. If an 114252f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// error occurs, true is returned and ErrorMsg (if not null) is set to indicate 11435c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// the problem. Upon failure, the Dest module could be in a modified state, and 11445c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// shouldn't be relied on to be consistent. 1145f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukmanbool 11460ba9e211bed7813949aaca97e6b15579c8188e05Reid SpencerLinker::LinkModules(Module *Dest, Module *Src, std::string *ErrorMsg) { 114757a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer assert(Dest != 0 && "Invalid Destination module"); 114857a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer assert(Src != 0 && "Invalid Source Module"); 114957a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 1150c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Dest->getDataLayout().empty()) { 1151c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (!Src->getDataLayout().empty()) { 1152ec9bfdc152a870d3c62377ed6855fb3bff69511cChris Lattner Dest->setDataLayout(Src->getDataLayout()); 1153c36357c406911ded5a0e2924998d885815370fdbChris Lattner } else { 1154c36357c406911ded5a0e2924998d885815370fdbChris Lattner std::string DataLayout; 1155c36357c406911ded5a0e2924998d885815370fdbChris Lattner 1156a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov if (Dest->getEndianness() == Module::AnyEndianness) { 1157c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Src->getEndianness() == Module::BigEndian) 1158c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append("E"); 1159c36357c406911ded5a0e2924998d885815370fdbChris Lattner else if (Src->getEndianness() == Module::LittleEndian) 1160c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append("e"); 1161a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov } 1162a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov 1163a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov if (Dest->getPointerSize() == Module::AnyPointerSize) { 1164c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Src->getPointerSize() == Module::Pointer64) 1165c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append(DataLayout.length() == 0 ? "p:64:64" : "-p:64:64"); 1166c36357c406911ded5a0e2924998d885815370fdbChris Lattner else if (Src->getPointerSize() == Module::Pointer32) 1167c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append(DataLayout.length() == 0 ? "p:32:32" : "-p:32:32"); 1168a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov } 1169c36357c406911ded5a0e2924998d885815370fdbChris Lattner Dest->setDataLayout(DataLayout); 1170c36357c406911ded5a0e2924998d885815370fdbChris Lattner } 1171c36357c406911ded5a0e2924998d885815370fdbChris Lattner } 1172873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner 1173f27dfcb210fec571d79bc881f5463e0b405707c0Chris Lattner // Copy the target triple from the source to dest if the dest's is empty. 1174c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Dest->getTargetTriple().empty() && !Src->getTargetTriple().empty()) 1175c36357c406911ded5a0e2924998d885815370fdbChris Lattner Dest->setTargetTriple(Src->getTargetTriple()); 1176c36357c406911ded5a0e2924998d885815370fdbChris Lattner 1177c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (!Src->getDataLayout().empty() && !Dest->getDataLayout().empty() && 1178c36357c406911ded5a0e2924998d885815370fdbChris Lattner Src->getDataLayout() != Dest->getDataLayout()) 117926f238589f9bb372d24b6fb2bc32edbf046fd9eeReid Spencer cerr << "WARNING: Linking two modules of different data layouts!\n"; 1180152f19ac6514ec29e183ddcdf2ea71599638dc4cChris Lattner if (!Src->getTargetTriple().empty() && 1181152f19ac6514ec29e183ddcdf2ea71599638dc4cChris Lattner Dest->getTargetTriple() != Src->getTargetTriple()) 1182e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << "WARNING: Linking two modules of different target triples!\n"; 1183f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 1184f27dfcb210fec571d79bc881f5463e0b405707c0Chris Lattner // Append the module inline asm string. 11856631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner if (!Src->getModuleInlineAsm().empty()) { 11866631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner if (Dest->getModuleInlineAsm().empty()) 11876631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner Dest->setModuleInlineAsm(Src->getModuleInlineAsm()); 1188e1b2e14f92e8e9da1eb4854511a881cf9c22af3cChris Lattner else 11896631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner Dest->setModuleInlineAsm(Dest->getModuleInlineAsm()+"\n"+ 11906631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner Src->getModuleInlineAsm()); 1191e1b2e14f92e8e9da1eb4854511a881cf9c22af3cChris Lattner } 1192e1b2e14f92e8e9da1eb4854511a881cf9c22af3cChris Lattner 1193719012d6254ee425464f034250176283fb96793bReid Spencer // Update the destination module's dependent libraries list with the libraries 119457a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // from the source module. There's no opportunity for duplicates here as the 119557a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // Module ensures that duplicate insertions are discarded. 1196f27dfcb210fec571d79bc881f5463e0b405707c0Chris Lattner for (Module::lib_iterator SI = Src->lib_begin(), SE = Src->lib_end(); 1197f27dfcb210fec571d79bc881f5463e0b405707c0Chris Lattner SI != SE; ++SI) 119857a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer Dest->addLibrary(*SI); 119957a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 12002c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // LinkTypes - Go through the symbol table of the Src module and see if any 12012c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // types are named in the src module that are not named in the Dst module. 12022c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Make sure there are no type name conflicts. 1203619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer if (LinkTypes(Dest, Src, ErrorMsg)) 1204619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer return true; 12052c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 12065c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // ValueMap - Mapping of values from what they used to be in Src, to what they 12075c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // are now in Dest. 12085c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> ValueMap; 12095c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 12108166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars - Keep track of global variables in the destination module 12118166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // with appending linkage. After the module is linked together, they are 12128166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // appended and the module is rewritten. 12138166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> AppendingVars; 12141127315562b221010040925980040fd4f65bdb1cChris Lattner for (Module::global_iterator I = Dest->global_begin(), E = Dest->global_end(); 12151127315562b221010040925980040fd4f65bdb1cChris Lattner I != E; ++I) { 12165a837defff581accc09048bea1cd839009e374a7Chris Lattner // Add all of the appending globals already in the Dest module to 12175a837defff581accc09048bea1cd839009e374a7Chris Lattner // AppendingVars. 1218f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner if (I->hasAppendingLinkage()) 1219f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner AppendingVars.insert(std::make_pair(I->getName(), I)); 12205a837defff581accc09048bea1cd839009e374a7Chris Lattner } 12215a837defff581accc09048bea1cd839009e374a7Chris Lattner 12228166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Insert all of the globals in src into the Dest module... without linking 12238166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers (which could refer to functions not yet mapped over). 1224ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (LinkGlobals(Dest, Src, ValueMap, AppendingVars, ErrorMsg)) 12255a837defff581accc09048bea1cd839009e374a7Chris Lattner return true; 12265c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 1227c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link the functions together between the two modules, without doing function 1228c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // bodies... this just adds external function prototypes to the Dest 1229c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // function... We do this so that when we begin processing function bodies, 1230c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // all of the global values that may be referenced are available in our 1231c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // ValueMap. 1232ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (LinkFunctionProtos(Dest, Src, ValueMap, ErrorMsg)) 12335a837defff581accc09048bea1cd839009e374a7Chris Lattner return true; 12345c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 12354fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov // If there were any alias, link them now. We really need to do this now, 12364fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov // because all of the aliases that may be referenced need to be available in 12374fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov // ValueMap 12384fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov if (LinkAlias(Dest, Src, ValueMap, ErrorMsg)) return true; 12394fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov 12406cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // Update the initializers in the Dest module now that all globals that may 12416cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // be referenced are in Dest. 12426cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner if (LinkGlobalInits(Dest, Src, ValueMap, ErrorMsg)) return true; 12436cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner 1244c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link in the function bodies that are defined in the source module into the 1245c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // DestModule. This consists basically of copying the function over and 1246c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // fixing up references to values. 124779df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner if (LinkFunctionBodies(Dest, Src, ValueMap, ErrorMsg)) return true; 124852f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 12498166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If there were any appending global variables, link them together now. 12508166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (LinkAppendingVars(Dest, AppendingVars, ErrorMsg)) return true; 12518166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 12523db9191baf5f5229a2f4d204c6332ba27fff81d0Anton Korobeynikov // Resolve all uses of aliases with aliasees 12533db9191baf5f5229a2f4d204c6332ba27fff81d0Anton Korobeynikov if (ResolveAliases(Dest)) return true; 12543db9191baf5f5229a2f4d204c6332ba27fff81d0Anton Korobeynikov 125557a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // If the source library's module id is in the dependent library list of the 125657a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // destination library, remove it since that module is now linked in. 125757a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer sys::Path modId; 1258dd04df0ec33a903ee7fc747701bafde622f77d8bReid Spencer modId.set(Src->getModuleIdentifier()); 125907adb2836b8aa7a3872e33c285958f5937662b50Reid Spencer if (!modId.isEmpty()) 126007adb2836b8aa7a3872e33c285958f5937662b50Reid Spencer Dest->removeLibrary(modId.getBasename()); 126157a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 126252f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner return false; 126352f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner} 12649466f5113ba859677a28887c3c7143065e702019Vikram S. Adve 1265567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer// vim: sw=2 1266