LinkModules.cpp revision 4e93885bab8c3738fdad3286e99dc147157218e8
1c834bbf55832c45f90b1163f920472fefbf77bc1Mikhail Glushenkov//===- 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" 22c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson#include "llvm/LLVMContext.h" 235c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner#include "llvm/Module.h" 2478d033e086e19e016273de014f9214aa6f3f844bReid Spencer#include "llvm/TypeSymbolTable.h" 25ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer#include "llvm/ValueSymbolTable.h" 26933f9bdb00a8fe48833c4ea3ded20a6a90c405b0Bill Wendling#include "llvm/Instructions.h" 27933f9bdb00a8fe48833c4ea3ded20a6a90c405b0Bill Wendling#include "llvm/Assembly/Writer.h" 280fbf0e3d5e8f45925fc879b705ae0320f8bc76f8David Greene#include "llvm/Support/Debug.h" 29c25e7581b9b8088910da31702d4ca21c4734c6d7Torok Edwin#include "llvm/Support/ErrorHandling.h" 3074382b7c699120fbec5cb5603c9cf4212eb37f06Chris Lattner#include "llvm/Support/raw_ostream.h" 311f6efa3996dd1929fbc129203ce5009b620e6969Michael J. Spencer#include "llvm/Support/Path.h" 3205ea54e8869a81b8dd846397175f218f97968907Dan Gohman#include "llvm/Transforms/Utils/ValueMapper.h" 33933f9bdb00a8fe48833c4ea3ded20a6a90c405b0Bill Wendling#include "llvm/ADT/DenseMap.h" 34f7703df4968084c18c248c1feea9961c19a32e6aChris Lattnerusing namespace llvm; 35d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke 365c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// Error - Simple wrapper function to conditionally assign to E and return true. 375c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// This just makes error return conditions a little bit simpler... 386e0d1cb30957a636c53158d3089e6fb88348a57aDaniel Dunbarstatic inline bool Error(std::string *E, const Twine &Message) { 396e0d1cb30957a636c53158d3089e6fb88348a57aDaniel Dunbar if (E) *E = Message.str(); 405c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return true; 415c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 425c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 43700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Function: ResolveTypes() 44700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 45700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Description: 46700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Attempt to link the two specified types together. 47700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 48700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Inputs: 49700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// DestTy - The type to which we wish to resolve. 50700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// SrcTy - The original type which we want to resolve. 51700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 52700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Outputs: 53700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// DestST - The symbol table in which the new type should be placed. 54700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 55700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Return value: 56700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// true - There is an error and the types cannot yet be linked. 57700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// false - No errors. 584c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner// 59bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattnerstatic bool ResolveTypes(const Type *DestTy, const Type *SrcTy) { 60e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DestTy == SrcTy) return false; // If already equal, noop 61bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner assert(DestTy && SrcTy && "Can't handle null types"); 62e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 63bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner if (const OpaqueType *OT = dyn_cast<OpaqueType>(DestTy)) { 64bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner // Type _is_ in module, just opaque... 65bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner const_cast<OpaqueType*>(OT)->refineAbstractTypeTo(SrcTy); 66bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner } else if (const OpaqueType *OT = dyn_cast<OpaqueType>(SrcTy)) { 67bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner const_cast<OpaqueType*>(OT)->refineAbstractTypeTo(DestTy); 68bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner } else { 69bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner return true; // Cannot link types... not-equal and neither is opaque. 704c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 714c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner return false; 724c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner} 734c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 7462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner/// LinkerTypeMap - This implements a map of types that is stable 7562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner/// even if types are resolved/refined to other types. This is not a general 7662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner/// purpose map, it is specific to the linker's use. 7762a81a1eba019ab570b002f8e1686494139785a1Chris Lattnernamespace { 7862a81a1eba019ab570b002f8e1686494139785a1Chris Lattnerclass LinkerTypeMap : public AbstractTypeUser { 7962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner typedef DenseMap<const Type*, PATypeHolder> TheMapTy; 8062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner TheMapTy TheMap; 81eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 828c8b9ee8c8646aa1a79c782d4da9abdf3eb4eefeArgyrios Kyrtzidis LinkerTypeMap(const LinkerTypeMap&); // DO NOT IMPLEMENT 838c8b9ee8c8646aa1a79c782d4da9abdf3eb4eefeArgyrios Kyrtzidis void operator=(const LinkerTypeMap&); // DO NOT IMPLEMENT 84fc196f9ee909ac35837f6f771a42aa0dec817584Chris Lattnerpublic: 85fc196f9ee909ac35837f6f771a42aa0dec817584Chris Lattner LinkerTypeMap() {} 86fc196f9ee909ac35837f6f771a42aa0dec817584Chris Lattner ~LinkerTypeMap() { 8762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner for (DenseMap<const Type*, PATypeHolder>::iterator I = TheMap.begin(), 8862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner E = TheMap.end(); I != E; ++I) 8962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner I->first->removeAbstractTypeUser(this); 9062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 91eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 9262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// lookup - Return the value for the specified type or null if it doesn't 9362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// exist. 9462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner const Type *lookup(const Type *Ty) const { 9562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner TheMapTy::const_iterator I = TheMap.find(Ty); 9662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (I != TheMap.end()) return I->second; 9762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return 0; 9862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 99eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 10062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// insert - This returns true if the pointer was new to the set, false if it 10162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// was already in the set. 10262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner bool insert(const Type *Src, const Type *Dst) { 1036b345ee9b2833cf1b2f79dc16d06d4060bec36efDan Gohman if (!TheMap.insert(std::make_pair(Src, PATypeHolder(Dst))).second) 10462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return false; // Already in map. 10562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (Src->isAbstract()) 10662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner Src->addAbstractTypeUser(this); 10762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return true; 10862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 109eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 11062a81a1eba019ab570b002f8e1686494139785a1Chris Lattnerprotected: 11162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// refineAbstractType - The callback method invoked when an abstract type is 11262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// resolved to another type. An object must override this method to update 11362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// its internal state to reference NewType instead of OldType. 11462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// 11562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner virtual void refineAbstractType(const DerivedType *OldTy, 11662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner const Type *NewTy) { 11762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner TheMapTy::iterator I = TheMap.find(OldTy); 11862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner const Type *DstTy = I->second; 119eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 12062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner TheMap.erase(I); 12162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (OldTy->isAbstract()) 12262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner OldTy->removeAbstractTypeUser(this); 12362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 12462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner // Don't reinsert into the map if the key is concrete now. 12562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (NewTy->isAbstract()) 12662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner insert(NewTy, DstTy); 12762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 128eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 12962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// The other case which AbstractTypeUsers must be aware of is when a type 13062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// makes the transition from being abstract (where it has clients on it's 13162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// AbstractTypeUsers list) to concrete (where it does not). This method 13262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// notifies ATU's when this occurs for a type. 13362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner virtual void typeBecameConcrete(const DerivedType *AbsTy) { 13462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner TheMap.erase(AbsTy); 13562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner AbsTy->removeAbstractTypeUser(this); 13662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 137eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 13862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner // for debugging... 13962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner virtual void dump() const { 1400fbf0e3d5e8f45925fc879b705ae0320f8bc76f8David Greene dbgs() << "AbstractTypeSet!\n"; 14162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 14262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner}; 14362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner} 14462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 14562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 146e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// RecursiveResolveTypes - This is just like ResolveTypes, except that it 147e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// recurses down into derived types, merging the used types if the parent types 148e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// are compatible. 149a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattnerstatic bool RecursiveResolveTypesI(const Type *DstTy, const Type *SrcTy, 15062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner LinkerTypeMap &Pointers) { 151a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (DstTy == SrcTy) return false; // If already equal, noop 152f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 153e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // If we found our opaque type, resolve it now! 15447c5188789bc40671504ed1fa3a44765cefba44fDuncan Sands if (DstTy->isOpaqueTy() || SrcTy->isOpaqueTy()) 155a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner return ResolveTypes(DstTy, SrcTy); 156f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 157e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Two types cannot be resolved together if they are of different primitive 158e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // type. For example, we cannot resolve an int to a float. 159a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (DstTy->getTypeID() != SrcTy->getTypeID()) return true; 160e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 16156539659eb1b192d493aa333b60213889129b9f1Chris Lattner // If neither type is abstract, then they really are just different types. 162a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (!DstTy->isAbstract() && !SrcTy->isAbstract()) 16356539659eb1b192d493aa333b60213889129b9f1Chris Lattner return true; 164eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 165e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Otherwise, resolve the used type used by this derived type... 166a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner switch (DstTy->getTypeID()) { 167f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner default: 168f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner return true; 169e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::FunctionTyID: { 170a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const FunctionType *DstFT = cast<FunctionType>(DstTy); 171a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const FunctionType *SrcFT = cast<FunctionType>(SrcTy); 1729ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner if (DstFT->isVarArg() != SrcFT->isVarArg() || 1739ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner DstFT->getNumContainedTypes() != SrcFT->getNumContainedTypes()) 17443f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return true; 175eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 176a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner // Use TypeHolder's so recursive resolution won't break us. 177a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner PATypeHolder ST(SrcFT), DT(DstFT); 178a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner for (unsigned i = 0, e = DstFT->getNumContainedTypes(); i != e; ++i) { 179a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const Type *SE = ST->getContainedType(i), *DE = DT->getContainedType(i); 180a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (SE != DE && RecursiveResolveTypesI(DE, SE, Pointers)) 181e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return true; 182a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner } 183e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return false; 184e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 185e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::StructTyID: { 186a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const StructType *DstST = cast<StructType>(DstTy); 187a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const StructType *SrcST = cast<StructType>(SrcTy); 1889ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner if (DstST->getNumContainedTypes() != SrcST->getNumContainedTypes()) 189f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner return true; 190eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 191a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner PATypeHolder ST(SrcST), DT(DstST); 192a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner for (unsigned i = 0, e = DstST->getNumContainedTypes(); i != e; ++i) { 193a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const Type *SE = ST->getContainedType(i), *DE = DT->getContainedType(i); 194a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (SE != DE && RecursiveResolveTypesI(DE, SE, Pointers)) 195e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return true; 196a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner } 197e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return false; 198e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 199e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::ArrayTyID: { 200a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const ArrayType *DAT = cast<ArrayType>(DstTy); 201a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const ArrayType *SAT = cast<ArrayType>(SrcTy); 202e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DAT->getNumElements() != SAT->getNumElements()) return true; 203e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner return RecursiveResolveTypesI(DAT->getElementType(), SAT->getElementType(), 204bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner Pointers); 205e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner } 206f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner case Type::VectorTyID: { 207a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const VectorType *DVT = cast<VectorType>(DstTy); 208a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const VectorType *SVT = cast<VectorType>(SrcTy); 209f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner if (DVT->getNumElements() != SVT->getNumElements()) return true; 210f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner return RecursiveResolveTypesI(DVT->getElementType(), SVT->getElementType(), 211f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner Pointers); 212f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner } 213e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner case Type::PointerTyID: { 214a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const PointerType *DstPT = cast<PointerType>(DstTy); 215a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const PointerType *SrcPT = cast<PointerType>(SrcTy); 216eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 2179ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner if (DstPT->getAddressSpace() != SrcPT->getAddressSpace()) 2189ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner return true; 219eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 220e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // If this is a pointer type, check to see if we have already seen it. If 221e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // so, we are in a recursive branch. Cut off the search now. We cannot use 222e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // an associative container for this search, because the type pointers (keys 22362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner // in the container) change whenever types get resolved. 22462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (SrcPT->isAbstract()) 22562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (const Type *ExistingDestTy = Pointers.lookup(SrcPT)) 22662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return ExistingDestTy != DstPT; 227eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 22862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (DstPT->isAbstract()) 22962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (const Type *ExistingSrcTy = Pointers.lookup(DstPT)) 23062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return ExistingSrcTy != SrcPT; 231e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // Otherwise, add the current pointers to the vector to stop recursion on 232e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // this pair. 23362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (DstPT->isAbstract()) 23462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner Pointers.insert(DstPT, SrcPT); 23562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (SrcPT->isAbstract()) 23662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner Pointers.insert(SrcPT, DstPT); 237eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 2389ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner return RecursiveResolveTypesI(DstPT->getElementType(), 2399ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner SrcPT->getElementType(), Pointers); 240e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 241f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman } 242e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner} 243e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 244a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattnerstatic bool RecursiveResolveTypes(const Type *DestTy, const Type *SrcTy) { 24562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner LinkerTypeMap PointerTypes; 246bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner return RecursiveResolveTypesI(DestTy, SrcTy, PointerTypes); 247e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner} 248e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner 249e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 2502c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// LinkTypes - Go through the symbol table of the Src module and see if any 2512c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// types are named in the src module that are not named in the Dst module. 2522c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// Make sure there are no type name conflicts. 2535c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic bool LinkTypes(Module *Dest, const Module *Src, std::string *Err) { 25478d033e086e19e016273de014f9214aa6f3f844bReid Spencer TypeSymbolTable *DestST = &Dest->getTypeSymbolTable(); 25578d033e086e19e016273de014f9214aa6f3f844bReid Spencer const TypeSymbolTable *SrcST = &Src->getTypeSymbolTable(); 2562c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 2572c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Look for a type plane for Type's... 25878d033e086e19e016273de014f9214aa6f3f844bReid Spencer TypeSymbolTable::const_iterator TI = SrcST->begin(); 25978d033e086e19e016273de014f9214aa6f3f844bReid Spencer TypeSymbolTable::const_iterator TE = SrcST->end(); 260567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer if (TI == TE) return false; // No named types, do nothing. 2612c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 262cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // Some types cannot be resolved immediately because they depend on other 263cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // types being resolved to each other first. This contains a list of types we 264cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // are waiting to recheck. 2654c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner std::vector<std::string> DelayedTypesToResolve; 2664c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 267567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer for ( ; TI != TE; ++TI ) { 268567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer const std::string &Name = TI->first; 269c28a224c68adf0464c275778af4bce762ad25d37Reid Spencer const Type *RHS = TI->second; 2702c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 271bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner // Check to see if this type name is already in the dest module. 27278d033e086e19e016273de014f9214aa6f3f844bReid Spencer Type *Entry = DestST->lookup(Name); 2734c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 274bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner // If the name is just in the source module, bring it over to the dest. 275bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner if (Entry == 0) { 276bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner if (!Name.empty()) 277bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner DestST->insert(Name, const_cast<Type*>(RHS)); 278bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner } else if (ResolveTypes(Entry, RHS)) { 2794c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // They look different, save the types 'till later to resolve. 2804c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner DelayedTypesToResolve.push_back(Name); 2814c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 2824c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 2834c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 2844c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Iteratively resolve types while we can... 2854c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner while (!DelayedTypesToResolve.empty()) { 2864c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Loop over all of the types, attempting to resolve them if possible... 2874c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner unsigned OldSize = DelayedTypesToResolve.size(); 2884c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 289e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Try direct resolution by name... 2904c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner for (unsigned i = 0; i != DelayedTypesToResolve.size(); ++i) { 2914c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner const std::string &Name = DelayedTypesToResolve[i]; 29278d033e086e19e016273de014f9214aa6f3f844bReid Spencer Type *T1 = SrcST->lookup(Name); 29378d033e086e19e016273de014f9214aa6f3f844bReid Spencer Type *T2 = DestST->lookup(Name); 294bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner if (!ResolveTypes(T2, T1)) { 2954c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // We are making progress! 2964c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i); 2974c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner --i; 2982f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner } 2994c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 3002f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner 3014c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Did we not eliminate any types? 3024c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (DelayedTypesToResolve.size() == OldSize) { 303e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Attempt to resolve subelements of types. This allows us to merge these 304e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // two types: { int* } and { opaque* } 3054c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner for (unsigned i = 0, e = DelayedTypesToResolve.size(); i != e; ++i) { 3064c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner const std::string &Name = DelayedTypesToResolve[i]; 307a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (!RecursiveResolveTypes(SrcST->lookup(Name), DestST->lookup(Name))) { 308e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // We are making progress! 309e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i); 310f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 311e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Go back to the main loop, perhaps we can resolve directly by name 312e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // now... 313e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner break; 314e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 315e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 316e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 317e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // If we STILL cannot resolve the types, then there is something wrong. 318e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DelayedTypesToResolve.size() == OldSize) { 319aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner // Remove the symbol name from the destination. 320aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner DelayedTypesToResolve.pop_back(); 3214c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 3222c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner } 3232c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner } 3244c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 3254c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 3262c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner return false; 3272c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner} 3282c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 3298bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer/// ForceRenaming - The LLVM SymbolTable class autorenames globals that conflict 3308bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer/// in the symbol table. This is good for all clients except for us. Go 3318bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer/// through the trouble to force this back. 332c003628a612d3687fb77088a5894314210a65385Chris Lattnerstatic void ForceRenaming(GlobalValue *GV, const std::string &Name) { 333c003628a612d3687fb77088a5894314210a65385Chris Lattner assert(GV->getName() != Name && "Can't force rename to self"); 334ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ValueSymbolTable &ST = GV->getParent()->getValueSymbolTable(); 335c003628a612d3687fb77088a5894314210a65385Chris Lattner 336c003628a612d3687fb77088a5894314210a65385Chris Lattner // If there is a conflict, rename the conflict. 33733f294930e0affa51c3818405741abd80cc90316Chris Lattner if (GlobalValue *ConflictGV = cast_or_null<GlobalValue>(ST.lookup(Name))) { 338bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola assert(ConflictGV->hasLocalLinkage() && 339ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer "Not conflicting with a static global, should link instead!"); 34033f294930e0affa51c3818405741abd80cc90316Chris Lattner GV->takeName(ConflictGV); 34133f294930e0affa51c3818405741abd80cc90316Chris Lattner ConflictGV->setName(Name); // This will cause ConflictGV to get renamed 342ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer assert(ConflictGV->getName() != Name && "ForceRenaming didn't work"); 34333f294930e0affa51c3818405741abd80cc90316Chris Lattner } else { 34433f294930e0affa51c3818405741abd80cc90316Chris Lattner GV->setName(Name); // Force the name back 345ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer } 346ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer} 347ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer 348ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer/// CopyGVAttributes - copy additional attributes (those not needed to construct 349eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov/// a GlobalValue) from the SrcGV to the DestGV. 350ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencerstatic void CopyGVAttributes(GlobalValue *DestGV, const GlobalValue *SrcGV) { 35128c3cff8250b3fe2adc6479306fe7dbdb48a1bdbDuncan Sands // Use the maximum alignment, rather than just copying the alignment of SrcGV. 35228c3cff8250b3fe2adc6479306fe7dbdb48a1bdbDuncan Sands unsigned Alignment = std::max(DestGV->getAlignment(), SrcGV->getAlignment()); 35328c3cff8250b3fe2adc6479306fe7dbdb48a1bdbDuncan Sands DestGV->copyAttributesFrom(SrcGV); 35428c3cff8250b3fe2adc6479306fe7dbdb48a1bdbDuncan Sands DestGV->setAlignment(Alignment); 355c003628a612d3687fb77088a5894314210a65385Chris Lattner} 356c003628a612d3687fb77088a5894314210a65385Chris Lattner 357aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// GetLinkageResult - This analyzes the two global values and determines what 358aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// the result will look like in the destination module. In particular, it 359aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// computes the resultant linkage type, computes whether the global in the 360aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// source should be copied over to the destination (replacing the existing 3619cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov/// one), and computes whether this linkage is an error or not. It also performs 3629cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov/// visibility checks: we cannot link together two symbols with different 3639cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov/// visibilities. 364968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikovstatic bool GetLinkageResult(GlobalValue *Dest, const GlobalValue *Src, 365aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner GlobalValue::LinkageTypes <, bool &LinkFromSrc, 366aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner std::string *Err) { 367bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola assert((!Dest || !Src->hasLocalLinkage()) && 368aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "If Src has internal linkage, Dest shouldn't be set!"); 369aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (!Dest) { 370aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // Linking something to nothing. 371aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 372aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 3735cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer } else if (Src->isDeclaration()) { 3742b48ef0450944c2c46633aec9baf6be835a3b503Anton Korobeynikov // If Src is external or if both Src & Dest are external.. Just link the 375aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // external globals, we aren't adding anything. 376b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov if (Src->hasDLLImportLinkage()) { 37778ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // If one of GVs has DLLImport linkage, result should be dllimport'ed. 3785cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer if (Dest->isDeclaration()) { 379b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LinkFromSrc = true; 380b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LT = Src->getLinkage(); 381eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov } 3828753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth } else if (Dest->hasExternalWeakLinkage()) { 383667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands // If the Dest is weak, use the source linkage. 3848753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth LinkFromSrc = true; 3858753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth LT = Src->getLinkage(); 386b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } else { 387b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LinkFromSrc = false; 388b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LT = Dest->getLinkage(); 389b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } 3905cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer } else if (Dest->isDeclaration() && !Dest->hasDLLImportLinkage()) { 391aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // If Dest is external but Src is not: 392aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 393aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 394aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else if (Src->hasAppendingLinkage() || Dest->hasAppendingLinkage()) { 395aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (Src->getLinkage() != Dest->getLinkage()) 396aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner return Error(Err, "Linking globals named '" + Src->getName() + 397aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "': can only link appending global with another appending global!"); 398aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; // Special cased. 399aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 400a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands } else if (Src->isWeakForLinker()) { 401aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen // At this point we know that Dest has LinkOnce, External*, Weak, Common, 402aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen // or DLL* linkage. 403266c7bbbbcc4b326dea82e577de1a415d6acc23eChris Lattner if (Dest->hasExternalWeakLinkage() || 404266c7bbbbcc4b326dea82e577de1a415d6acc23eChris Lattner Dest->hasAvailableExternallyLinkage() || 405266c7bbbbcc4b326dea82e577de1a415d6acc23eChris Lattner (Dest->hasLinkOnceLinkage() && 406266c7bbbbcc4b326dea82e577de1a415d6acc23eChris Lattner (Src->hasWeakLinkage() || Src->hasCommonLinkage()))) { 407aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 408aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 409aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else { 410aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = false; 411aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Dest->getLinkage(); 412aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 413a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands } else if (Dest->isWeakForLinker()) { 41478ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // At this point we know that Src has External* or DLL* linkage. 41578ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov if (Src->hasExternalWeakLinkage()) { 41678ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LinkFromSrc = false; 41778ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LT = Dest->getLinkage(); 41878ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov } else { 41978ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LinkFromSrc = true; 42078ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LT = GlobalValue::ExternalLinkage; 42178ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov } 422aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else { 423b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov assert((Dest->hasExternalLinkage() || 424b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov Dest->hasDLLImportLinkage() || 42578ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Dest->hasDLLExportLinkage() || 42678ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Dest->hasExternalWeakLinkage()) && 427b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov (Src->hasExternalLinkage() || 428b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov Src->hasDLLImportLinkage() || 42978ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Src->hasDLLExportLinkage() || 43078ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Src->hasExternalWeakLinkage()) && 431aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "Unexpected linkage type!"); 432f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman return Error(Err, "Linking globals named '" + Src->getName() + 433aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "': symbol multiply defined!"); 434aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 4359cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov 4369cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov // Check visibility 4374e93885bab8c3738fdad3286e99dc147157218e8Rafael Espindola if (Dest && Src->getVisibility() != Dest->getVisibility() && 4384e93885bab8c3738fdad3286e99dc147157218e8Rafael Espindola !Src->isDeclaration() && !Dest->isDeclaration() && 4394e93885bab8c3738fdad3286e99dc147157218e8Rafael Espindola !Src->hasAvailableExternallyLinkage() && 4404e93885bab8c3738fdad3286e99dc147157218e8Rafael Espindola !Dest->hasAvailableExternallyLinkage()) 44197f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner return Error(Err, "Linking globals named '" + Src->getName() + 44297f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner "': symbols have different visibilities!"); 443aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner return false; 444aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner} 4455c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 446ab67e705f59d567afded845465f358b8a66ab62eDevang Patel// Insert all of the named mdnoes in Src into the Dest module. 447e5835fbe7fb3d87b8cd110b24f0f9772384a5212Dan Gohmanstatic void LinkNamedMDNodes(Module *Dest, Module *Src, 448e5835fbe7fb3d87b8cd110b24f0f9772384a5212Dan Gohman ValueToValueMapTy &ValueMap) { 449ab67e705f59d567afded845465f358b8a66ab62eDevang Patel for (Module::const_named_metadata_iterator I = Src->named_metadata_begin(), 450ab67e705f59d567afded845465f358b8a66ab62eDevang Patel E = Src->named_metadata_end(); I != E; ++I) { 451ab67e705f59d567afded845465f358b8a66ab62eDevang Patel const NamedMDNode *SrcNMD = I; 45217aa92c92a925b4a674440c7ef088c223990e854Dan Gohman NamedMDNode *DestNMD = Dest->getOrInsertNamedMetadata(SrcNMD->getName()); 45317aa92c92a925b4a674440c7ef088c223990e854Dan Gohman // Add Src elements into Dest node. 45479e86252208848020e0b13d77b8c6918e92b8328Michael J. Spencer for (unsigned i = 0, e = SrcNMD->getNumOperands(); i != e; ++i) 455e5835fbe7fb3d87b8cd110b24f0f9772384a5212Dan Gohman DestNMD->addOperand(cast<MDNode>(MapValue(SrcNMD->getOperand(i), 456b5fa5fcecc97168a72c9533c84cf297c018b957cChris Lattner ValueMap))); 457ab67e705f59d567afded845465f358b8a66ab62eDevang Patel } 458ab67e705f59d567afded845465f358b8a66ab62eDevang Patel} 459ab67e705f59d567afded845465f358b8a66ab62eDevang Patel 4605c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// LinkGlobals - Loop through the global variables in the src module and merge 4618166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// them into the dest module. 462968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikovstatic bool LinkGlobals(Module *Dest, const Module *Src, 46305ea54e8869a81b8dd846397175f218f97968907Dan Gohman ValueToValueMapTy &ValueMap, 4648166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 4655c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 466d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner ValueSymbolTable &DestSymTab = Dest->getValueSymbolTable(); 467eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 4685c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 4690bb8757997392ee18ca9de0f1fab29463f8e7aebChris Lattner for (Module::const_global_iterator I = Src->global_begin(), 4700bb8757997392ee18ca9de0f1fab29463f8e7aebChris Lattner E = Src->global_end(); I != E; ++I) { 471968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov const GlobalVariable *SGV = I; 47201f69399352380532d480f6749daed660f50b15cAnton Korobeynikov GlobalValue *DGV = 0; 47301f69399352380532d480f6749daed660f50b15cAnton Korobeynikov 474933f9bdb00a8fe48833c4ea3ded20a6a90c405b0Bill Wendling // Check to see if may have to link the global with the global, alias or 475d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // function. 476bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (SGV->hasName() && !SGV->hasLocalLinkage()) 477933f9bdb00a8fe48833c4ea3ded20a6a90c405b0Bill Wendling DGV = cast_or_null<GlobalValue>(DestSymTab.lookup(SGV->getName())); 478eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 479ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner // If we found a global with the same name in the dest module, but it has 480ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner // internal linkage, we are really not doing any linkage here. 481bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (DGV && DGV->hasLocalLinkage()) 482ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner DGV = 0; 483eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 484d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // If types don't agree due to opaque types, try to resolve them. 485d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner if (DGV && DGV->getType() != SGV->getType()) 486d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner RecursiveResolveTypes(SGV->getType(), DGV->getType()); 48701f69399352380532d480f6749daed660f50b15cAnton Korobeynikov 488c318329a1098a19137398af4d880f4d8cdd9cd8dDan Gohman assert((SGV->hasInitializer() || SGV->hasExternalWeakLinkage() || 489c318329a1098a19137398af4d880f4d8cdd9cd8dDan Gohman SGV->hasExternalLinkage() || SGV->hasDLLImportLinkage()) && 4904ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner "Global must either be external or have an initializer!"); 4915c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 492b324bd735ff5c99a52cd3c3f5d01c0e1398a2d3aChris Lattner GlobalValue::LinkageTypes NewLinkage = GlobalValue::InternalLinkage; 493b324bd735ff5c99a52cd3c3f5d01c0e1398a2d3aChris Lattner bool LinkFromSrc = false; 494aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (GetLinkageResult(DGV, SGV, NewLinkage, LinkFromSrc, Err)) 495aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner return true; 4960fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner 4976157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (DGV == 0) { 4985c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // No linking to be performed, simply create an identical version of the 4998d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // symbol over in the dest module... the initializer will be filled in 500d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // later by LinkGlobalInits. 5012719bac90525985f4ebb97324b4c087d47b54384Chris Lattner GlobalVariable *NewDGV = 502e9b11b431308f4766b73cda93e38ec930c912122Owen Anderson new GlobalVariable(*Dest, SGV->getType()->getElementType(), 5032719bac90525985f4ebb97324b4c087d47b54384Chris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 504e9b11b431308f4766b73cda93e38ec930c912122Owen Anderson SGV->getName(), 0, false, 505a534b0f7bf0248bf90afe97110a34777e972f325Chris Lattner SGV->getType()->getAddressSpace()); 506471feac1b297b9458de18d973af371bf7f10296bReid Spencer // Propagate alignment, visibility and section info. 507ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer CopyGVAttributes(NewDGV, SGV); 5085dfbaf1fe3fa6914095cc55cde20b1ed25187b56Andrew Lenharth 5092719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // If the LLVM runtime renamed the global, but it is an externally visible 5102719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // symbol, DGV must be an existing global with internal linkage. Rename 5112719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // it. 512bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (!NewDGV->hasLocalLinkage() && NewDGV->getName() != SGV->getName()) 513c003628a612d3687fb77088a5894314210a65385Chris Lattner ForceRenaming(NewDGV, SGV->getName()); 5145c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 5156157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Make sure to remember this mapping. 516817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[SGV] = NewDGV; 517817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov 518d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // Keep track that this is an appending variable. 5198166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (SGV->hasAppendingLinkage()) 5208166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV)); 5216157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner continue; 5226157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner } 523eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 524ba7c38c36adb65d66c129270b2813fd2167488edRafael Espindola bool HasUnnamedAddr = SGV->hasUnnamedAddr() && DGV->hasUnnamedAddr(); 525ba7c38c36adb65d66c129270b2813fd2167488edRafael Espindola 5266157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // If the visibilities of the symbols disagree and the destination is a 5276157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // prototype, take the visibility of its input. 5286157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (DGV->isDeclaration()) 5296157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner DGV->setVisibility(SGV->getVisibility()); 530eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 5316157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (DGV->hasAppendingLinkage()) { 5328166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // No linking is performed yet. Just insert a new copy of the global, and 5338166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // keep track of the fact that it is an appending variable in the 5348166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars map. The name is cleared out so that no linkage is 5358166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // performed. 5368166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NewDGV = 537e9b11b431308f4766b73cda93e38ec930c912122Owen Anderson new GlobalVariable(*Dest, SGV->getType()->getElementType(), 5388166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 539e9b11b431308f4766b73cda93e38ec930c912122Owen Anderson "", 0, false, 540a534b0f7bf0248bf90afe97110a34777e972f325Chris Lattner SGV->getType()->getAddressSpace()); 5418166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 54275c7915c3a24f8063c274ccffe2dc9b7bc8bce1fAnton Korobeynikov // Set alignment allowing CopyGVAttributes merge it with alignment of SGV. 543ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer NewDGV->setAlignment(DGV->getAlignment()); 54475c7915c3a24f8063c274ccffe2dc9b7bc8bce1fAnton Korobeynikov // Propagate alignment, section and visibility info. 545ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer CopyGVAttributes(NewDGV, SGV); 5465dfbaf1fe3fa6914095cc55cde20b1ed25187b56Andrew Lenharth 5478166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Make sure to remember this mapping... 548817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[SGV] = NewDGV; 5498166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 5508166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Keep track that this is an appending variable... 5518166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV)); 5526157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner continue; 5536157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner } 554eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 5556157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (LinkFromSrc) { 5566157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (isa<GlobalAlias>(DGV)) 5571438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Global-Alias Collision on '" + SGV->getName() + 5581438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': symbol multiple defined"); 559eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 560d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // If the types don't match, and if we are to link from the source, nuke 561d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // DGV and create a new one of the appropriate type. Note that the thing 562d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // we are replacing may be a function (if a prototype, weak, etc) or a 563d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // global variable. 564d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner GlobalVariable *NewDGV = 56579e86252208848020e0b13d77b8c6918e92b8328Michael J. Spencer new GlobalVariable(*Dest, SGV->getType()->getElementType(), 56679e86252208848020e0b13d77b8c6918e92b8328Michael J. Spencer SGV->isConstant(), NewLinkage, /*init*/0, 567e9b11b431308f4766b73cda93e38ec930c912122Owen Anderson DGV->getName(), 0, false, 568d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner SGV->getType()->getAddressSpace()); 569eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 570ba7c38c36adb65d66c129270b2813fd2167488edRafael Espindola // Set the unnamed_addr. 571ba7c38c36adb65d66c129270b2813fd2167488edRafael Espindola NewDGV->setUnnamedAddr(HasUnnamedAddr); 572ba7c38c36adb65d66c129270b2813fd2167488edRafael Espindola 573d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // Propagate alignment, section, and visibility info. 574d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner CopyGVAttributes(NewDGV, SGV); 57579e86252208848020e0b13d77b8c6918e92b8328Michael J. Spencer DGV->replaceAllUsesWith(ConstantExpr::getBitCast(NewDGV, 576c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson DGV->getType())); 577eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 578d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // DGV will conflict with NewDGV because they both had the same 579d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // name. We must erase this now so ForceRenaming doesn't assert 580d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // because DGV might not have internal linkage. 581d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner if (GlobalVariable *Var = dyn_cast<GlobalVariable>(DGV)) 582d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner Var->eraseFromParent(); 583d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner else 584d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner cast<Function>(DGV)->eraseFromParent(); 585d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner 586d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // If the symbol table renamed the global, but it is an externally visible 587d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // symbol, DGV must be an existing global with internal linkage. Rename. 588bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (NewDGV->getName() != SGV->getName() && !NewDGV->hasLocalLinkage()) 589d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner ForceRenaming(NewDGV, SGV->getName()); 590eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 5916157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Inherit const as appropriate. 592d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner NewDGV->setConstant(SGV->isConstant()); 593eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 5946157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Make sure to remember this mapping. 5956157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner ValueMap[SGV] = NewDGV; 5966157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner continue; 5975c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 598eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 5996157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Not "link from source", keep the one in the DestModule and remap the 6006157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // input onto it. 601eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 6026157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Special case for const propagation. 6036157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (GlobalVariable *DGVar = dyn_cast<GlobalVariable>(DGV)) 6046157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (DGVar->isDeclaration() && SGV->isConstant() && !DGVar->isConstant()) 6056157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner DGVar->setConstant(true); 6066157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 607d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // SGV is global, but DGV is alias. 608d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov if (isa<GlobalAlias>(DGV)) { 609d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // The only valid mappings are: 610d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // - SGV is external declaration, which is effectively a no-op. 611d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // - SGV is weak, when we just need to throw SGV out. 612a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands if (!SGV->isDeclaration() && !SGV->isWeakForLinker()) 613d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov return Error(Err, "Global-Alias Collision on '" + SGV->getName() + 614d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov "': symbol multiple defined"); 615d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov } 616eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 617ba7c38c36adb65d66c129270b2813fd2167488edRafael Espindola // Set calculated linkage and unnamed_addr 6186157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner DGV->setLinkage(NewLinkage); 619ba7c38c36adb65d66c129270b2813fd2167488edRafael Espindola DGV->setUnnamedAddr(HasUnnamedAddr); 620eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 6216157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Make sure to remember this mapping... 622baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson ValueMap[SGV] = ConstantExpr::getBitCast(DGV, SGV->getType()); 6235c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 6245c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 6255c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 6265c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 62758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikovstatic GlobalValue::LinkageTypes 62858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton KorobeynikovCalculateAliasLinkage(const GlobalValue *SGV, const GlobalValue *DGV) { 629667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands GlobalValue::LinkageTypes SL = SGV->getLinkage(); 630667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands GlobalValue::LinkageTypes DL = DGV->getLinkage(); 631667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands if (SL == GlobalValue::ExternalLinkage || DL == GlobalValue::ExternalLinkage) 63258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov return GlobalValue::ExternalLinkage; 633667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands else if (SL == GlobalValue::WeakAnyLinkage || 634667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands DL == GlobalValue::WeakAnyLinkage) 635667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands return GlobalValue::WeakAnyLinkage; 636667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands else if (SL == GlobalValue::WeakODRLinkage || 637667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands DL == GlobalValue::WeakODRLinkage) 638667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands return GlobalValue::WeakODRLinkage; 639667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands else if (SL == GlobalValue::InternalLinkage && 640667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands DL == GlobalValue::InternalLinkage) 64158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov return GlobalValue::InternalLinkage; 6423d10a5a75794356a0a568ce283713adc3a963200Bill Wendling else if (SL == GlobalValue::LinkerPrivateLinkage && 6433d10a5a75794356a0a568ce283713adc3a963200Bill Wendling DL == GlobalValue::LinkerPrivateLinkage) 6443d10a5a75794356a0a568ce283713adc3a963200Bill Wendling return GlobalValue::LinkerPrivateLinkage; 6454e34d502727df36cc2caa59307953444b1ee9914Bill Wendling else if (SL == GlobalValue::LinkerPrivateWeakLinkage && 6464e34d502727df36cc2caa59307953444b1ee9914Bill Wendling DL == GlobalValue::LinkerPrivateWeakLinkage) 6474e34d502727df36cc2caa59307953444b1ee9914Bill Wendling return GlobalValue::LinkerPrivateWeakLinkage; 6484e34d502727df36cc2caa59307953444b1ee9914Bill Wendling else if (SL == GlobalValue::LinkerPrivateWeakDefAutoLinkage && 6494e34d502727df36cc2caa59307953444b1ee9914Bill Wendling DL == GlobalValue::LinkerPrivateWeakDefAutoLinkage) 6504e34d502727df36cc2caa59307953444b1ee9914Bill Wendling return GlobalValue::LinkerPrivateWeakDefAutoLinkage; 651bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola else { 652667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands assert (SL == GlobalValue::PrivateLinkage && 653667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands DL == GlobalValue::PrivateLinkage && "Unexpected linkage type"); 654bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola return GlobalValue::PrivateLinkage; 65558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } 65658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov} 65758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 65831ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio// LinkAlias - Loop through the alias in the src module and link them into the 65958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov// dest module. We're assuming, that all functions/global variables were already 66058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov// linked in. 6614fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikovstatic bool LinkAlias(Module *Dest, const Module *Src, 66205ea54e8869a81b8dd846397175f218f97968907Dan Gohman ValueToValueMapTy &ValueMap, 6634fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov std::string *Err) { 66431ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio // Loop over all alias in the src module 66531ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio for (Module::const_alias_iterator I = Src->alias_begin(), 66631ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio E = Src->alias_end(); I != E; ++I) { 66758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov const GlobalAlias *SGA = I; 66858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov const GlobalValue *SAliasee = SGA->getAliasedGlobal(); 66958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov GlobalAlias *NewGA = NULL; 67058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 67158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Globals were already linked, thus we can just query ValueMap for variant 672caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // of SAliasee in Dest. 67305ea54e8869a81b8dd846397175f218f97968907Dan Gohman ValueToValueMapTy::const_iterator VMI = ValueMap.find(SAliasee); 67458d5e051574339106ce4139697ebadd21e34dbc0Ted Kremenek assert(VMI != ValueMap.end() && "Aliasee not linked"); 67558d5e051574339106ce4139697ebadd21e34dbc0Ted Kremenek GlobalValue* DAliasee = cast<GlobalValue>(VMI->second); 676caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov GlobalValue* DGV = NULL; 67758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 67819785995f60c6980677888985884d65dc8975b44Rafael Espindola // Fixup aliases to bitcasts. Note that aliases to GEPs are still broken 67919785995f60c6980677888985884d65dc8975b44Rafael Espindola // by this, but aliases to GEPs are broken to a lot of other things, so 68019785995f60c6980677888985884d65dc8975b44Rafael Espindola // it's less important. 68119785995f60c6980677888985884d65dc8975b44Rafael Espindola Constant *DAliaseeConst = DAliasee; 68219785995f60c6980677888985884d65dc8975b44Rafael Espindola if (SGA->getType() != DAliasee->getType()) 68319785995f60c6980677888985884d65dc8975b44Rafael Espindola DAliaseeConst = ConstantExpr::getBitCast(DAliasee, SGA->getType()); 68419785995f60c6980677888985884d65dc8975b44Rafael Espindola 68558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Try to find something 'similar' to SGA in destination module. 686bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (!DGV && !SGA->hasLocalLinkage()) { 687caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGV = Dest->getNamedAlias(SGA->getName()); 688caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 689caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // If types don't agree due to opaque types, try to resolve them. 690caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (DGV && DGV->getType() != SGA->getType()) 6915ed2ba26680f06846e7602ce65432b0a723b1273Chris Lattner RecursiveResolveTypes(SGA->getType(), DGV->getType()); 692caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } 693caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 694bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (!DGV && !SGA->hasLocalLinkage()) { 695caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGV = Dest->getGlobalVariable(SGA->getName()); 696caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 69758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // If types don't agree due to opaque types, try to resolve them. 698caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (DGV && DGV->getType() != SGA->getType()) 6995ed2ba26680f06846e7602ce65432b0a723b1273Chris Lattner RecursiveResolveTypes(SGA->getType(), DGV->getType()); 700caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } 70158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 702bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (!DGV && !SGA->hasLocalLinkage()) { 703caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGV = Dest->getFunction(SGA->getName()); 704caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 705caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // If types don't agree due to opaque types, try to resolve them. 706caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (DGV && DGV->getType() != SGA->getType()) 7075ed2ba26680f06846e7602ce65432b0a723b1273Chris Lattner RecursiveResolveTypes(SGA->getType(), DGV->getType()); 708caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } 709caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 710caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // No linking to be performed on internal stuff. 711bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (DGV && DGV->hasLocalLinkage()) 712caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGV = NULL; 713caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 714caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (GlobalAlias *DGA = dyn_cast_or_null<GlobalAlias>(DGV)) { 715caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // Types are known to be the same, check whether aliasees equal. As 71658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // globals are already linked we just need query ValueMap to find the 71758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // mapping. 71858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov if (DAliasee == DGA->getAliasedGlobal()) { 71958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // This is just two copies of the same alias. Propagate linkage, if 72058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // necessary. 72158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov DGA->setLinkage(CalculateAliasLinkage(SGA, DGA)); 72258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 72358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov NewGA = DGA; 72458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Proceed to 'common' steps 72558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } else 7261438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Alias Collision on '" + SGA->getName()+ 7271438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': aliases have different aliasees"); 728caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } else if (GlobalVariable *DGVar = dyn_cast_or_null<GlobalVariable>(DGV)) { 729f88bc65932e5cf41ba6ca706cd1b1b1f65300248Anton Korobeynikov // The only allowed way is to link alias with external declaration or weak 730f88bc65932e5cf41ba6ca706cd1b1b1f65300248Anton Korobeynikov // symbol.. 731a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands if (DGVar->isDeclaration() || DGVar->isWeakForLinker()) { 732ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov // But only if aliasee is global too... 733ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov if (!isa<GlobalVariable>(DAliasee)) 734caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov return Error(Err, "Global-Alias Collision on '" + SGA->getName() + 735caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov "': aliasee is not global variable"); 736ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov 73758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov NewGA = new GlobalAlias(SGA->getType(), SGA->getLinkage(), 73819785995f60c6980677888985884d65dc8975b44Rafael Espindola SGA->getName(), DAliaseeConst, Dest); 73958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov CopyGVAttributes(NewGA, SGA); 74058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 74158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Any uses of DGV need to change to NewGA, with cast, if needed. 742caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (SGA->getType() != DGVar->getType()) 743baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson DGVar->replaceAllUsesWith(ConstantExpr::getBitCast(NewGA, 744caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGVar->getType())); 74558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov else 746caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGVar->replaceAllUsesWith(NewGA); 74758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 748caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // DGVar will conflict with NewGA because they both had the same 74958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // name. We must erase this now so ForceRenaming doesn't assert 75058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // because DGV might not have internal linkage. 751caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGVar->eraseFromParent(); 75258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 75358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Proceed to 'common' steps 75458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } else 7551438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Global-Alias Collision on '" + SGA->getName() + 7561438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': symbol multiple defined"); 757caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } else if (Function *DF = dyn_cast_or_null<Function>(DGV)) { 758f88bc65932e5cf41ba6ca706cd1b1b1f65300248Anton Korobeynikov // The only allowed way is to link alias with external declaration or weak 759f88bc65932e5cf41ba6ca706cd1b1b1f65300248Anton Korobeynikov // symbol... 760a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands if (DF->isDeclaration() || DF->isWeakForLinker()) { 761ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov // But only if aliasee is function too... 762ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov if (!isa<Function>(DAliasee)) 763caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov return Error(Err, "Function-Alias Collision on '" + SGA->getName() + 764caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov "': aliasee is not function"); 765ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov 766b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov NewGA = new GlobalAlias(SGA->getType(), SGA->getLinkage(), 76719785995f60c6980677888985884d65dc8975b44Rafael Espindola SGA->getName(), DAliaseeConst, Dest); 768b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov CopyGVAttributes(NewGA, SGA); 769b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov 770b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // Any uses of DF need to change to NewGA, with cast, if needed. 771b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov if (SGA->getType() != DF->getType()) 772baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson DF->replaceAllUsesWith(ConstantExpr::getBitCast(NewGA, 773b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov DF->getType())); 774b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov else 775b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov DF->replaceAllUsesWith(NewGA); 776b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov 777b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // DF will conflict with NewGA because they both had the same 778b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // name. We must erase this now so ForceRenaming doesn't assert 779b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // because DF might not have internal linkage. 780b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov DF->eraseFromParent(); 781b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov 782b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // Proceed to 'common' steps 783b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov } else 7841438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Function-Alias Collision on '" + SGA->getName() + 7851438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': symbol multiple defined"); 78658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } else { 787caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // No linking to be performed, simply create an identical version of the 788caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // alias over in the dest module... 78958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov NewGA = new GlobalAlias(SGA->getType(), SGA->getLinkage(), 79019785995f60c6980677888985884d65dc8975b44Rafael Espindola SGA->getName(), DAliaseeConst, Dest); 79158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov CopyGVAttributes(NewGA, SGA); 79258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 79358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Proceed to 'common' steps 79458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } 79558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 79658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov assert(NewGA && "No alias was created in destination module!"); 79758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 798b8cdaf7099898d7c0eef4769bf6a89f39e7decc2Anton Korobeynikov // If the symbol table renamed the alias, but it is an externally visible 799caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // symbol, DGA must be an global value with internal linkage. Rename it. 80058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov if (NewGA->getName() != SGA->getName() && 801bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola !NewGA->hasLocalLinkage()) 80258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov ForceRenaming(NewGA, SGA->getName()); 80358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 80458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Remember this mapping so uses in the source module get remapped 80505ea54e8869a81b8dd846397175f218f97968907Dan Gohman // later by MapValue. 806817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[SGA] = NewGA; 80731ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio } 80858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 80931ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio return false; 81031ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio} 81131ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio 8125c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 8138d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// LinkGlobalInits - Update the initializers in the Dest module now that all 8148d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// globals that may be referenced are in Dest. 8158d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattnerstatic bool LinkGlobalInits(Module *Dest, const Module *Src, 81605ea54e8869a81b8dd846397175f218f97968907Dan Gohman ValueToValueMapTy &ValueMap, 8175c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 8188d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 8191127315562b221010040925980040fd4f65bdb1cChris Lattner for (Module::const_global_iterator I = Src->global_begin(), 8201127315562b221010040925980040fd4f65bdb1cChris Lattner E = Src->global_end(); I != E; ++I) { 82118961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const GlobalVariable *SGV = I; 8228d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 8238d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner if (SGV->hasInitializer()) { // Only process initialized GV's 824b5fa5fcecc97168a72c9533c84cf297c018b957cChris Lattner // Figure out what the initializer looks like in the dest module. 8254ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner Constant *SInit = 826b5fa5fcecc97168a72c9533c84cf297c018b957cChris Lattner cast<Constant>(MapValue(SGV->getInitializer(), ValueMap)); 827d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // Grab destination global variable or alias. 828d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov GlobalValue *DGV = cast<GlobalValue>(ValueMap[SGV]->stripPointerCasts()); 829d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov 830933f9bdb00a8fe48833c4ea3ded20a6a90c405b0Bill Wendling // If dest if global variable, check that initializers match. 831d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov if (GlobalVariable *DGVar = dyn_cast<GlobalVariable>(DGV)) { 832d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov if (DGVar->hasInitializer()) { 833933f9bdb00a8fe48833c4ea3ded20a6a90c405b0Bill Wendling if (SGV->hasExternalLinkage()) { 834d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov if (DGVar->getInitializer() != SInit) 835d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov return Error(Err, "Global Variable Collision on '" + 836d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov SGV->getName() + 837d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov "': global variables have different initializers"); 838a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands } else if (DGVar->isWeakForLinker()) { 839d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // Nothing is required, mapped values will take the new global 840d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // automatically. 841a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands } else if (SGV->isWeakForLinker()) { 842d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // Nothing is required, mapped values will take the new global 843d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // automatically. 844d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov } else if (DGVar->hasAppendingLinkage()) { 845c23197a26f34f559ea9797de51e187087c039c42Torok Edwin llvm_unreachable("Appending linkage unimplemented!"); 846d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov } else { 847c23197a26f34f559ea9797de51e187087c039c42Torok Edwin llvm_unreachable("Unknown linkage!"); 848d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov } 8494ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else { 850d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // Copy the initializer over now... 851d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov DGVar->setInitializer(SInit); 8524ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } 8538d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } else { 854d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // Destination is alias, the only valid situation is when source is 855d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // weak. Also, note, that we already checked linkage in LinkGlobals(), 856d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // thus we assert here. 857d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // FIXME: Should we weaken this assumption, 'dereference' alias and 858d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // check for initializer of aliasee? 859a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands assert(SGV->isWeakForLinker()); 8608d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 8618d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 8628d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 8638d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return false; 8648d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner} 8655c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 86679df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner// LinkFunctionProtos - Link the functions together between the two modules, 867c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// without doing function bodies... this just adds external function prototypes 868c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// to the Dest function... 8695c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 87079df7c0aaa18129e55968c8783ef8346807bd4afChris Lattnerstatic bool LinkFunctionProtos(Module *Dest, const Module *Src, 87105ea54e8869a81b8dd846397175f218f97968907Dan Gohman ValueToValueMapTy &ValueMap, 8725c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 873d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner ValueSymbolTable &DestSymTab = Dest->getValueSymbolTable(); 874eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 875619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer // Loop over all of the functions in the src module, mapping them over 8765c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner for (Module::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) { 87718961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const Function *SF = I; // SrcFunction 878194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov GlobalValue *DGV = 0; 879eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 880d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // Check to see if may have to link the function with the global, alias or 881d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // function. 882bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (SF->hasName() && !SF->hasLocalLinkage()) 88303d7651c3652e1f0cc86e79b26585d86818da9cfDaniel Dunbar DGV = cast_or_null<GlobalValue>(DestSymTab.lookup(SF->getName())); 884eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 885ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner // If we found a global with the same name in the dest module, but it has 886ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner // internal linkage, we are really not doing any linkage here. 887bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (DGV && DGV->hasLocalLinkage()) 888ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner DGV = 0; 889ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner 890d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // If types don't agree due to opaque types, try to resolve them. 891d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner if (DGV && DGV->getType() != SF->getType()) 892d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner RecursiveResolveTypes(SF->getType(), DGV->getType()); 893194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov 8946157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner GlobalValue::LinkageTypes NewLinkage = GlobalValue::InternalLinkage; 8956157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner bool LinkFromSrc = false; 8966157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (GetLinkageResult(DGV, SF, NewLinkage, LinkFromSrc, Err)) 8976157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner return true; 898eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 899824684982968244050e56357e736b9940c23e77dChris Lattner // If there is no linkage to be performed, just bring over SF without 900824684982968244050e56357e736b9940c23e77dChris Lattner // modifying it. 901194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov if (DGV == 0) { 902824684982968244050e56357e736b9940c23e77dChris Lattner // Function does not already exist, simply insert an function signature 903824684982968244050e56357e736b9940c23e77dChris Lattner // identical to SF into the dest module. 904824684982968244050e56357e736b9940c23e77dChris Lattner Function *NewDF = Function::Create(SF->getFunctionType(), 905824684982968244050e56357e736b9940c23e77dChris Lattner SF->getLinkage(), 906824684982968244050e56357e736b9940c23e77dChris Lattner SF->getName(), Dest); 907824684982968244050e56357e736b9940c23e77dChris Lattner CopyGVAttributes(NewDF, SF); 908eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 909824684982968244050e56357e736b9940c23e77dChris Lattner // If the LLVM runtime renamed the function, but it is an externally 910824684982968244050e56357e736b9940c23e77dChris Lattner // visible symbol, DF must be an existing function with internal linkage. 911824684982968244050e56357e736b9940c23e77dChris Lattner // Rename it. 912bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (!NewDF->hasLocalLinkage() && NewDF->getName() != SF->getName()) 913824684982968244050e56357e736b9940c23e77dChris Lattner ForceRenaming(NewDF, SF->getName()); 914eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 915824684982968244050e56357e736b9940c23e77dChris Lattner // ... and remember this mapping... 916824684982968244050e56357e736b9940c23e77dChris Lattner ValueMap[SF] = NewDF; 917824684982968244050e56357e736b9940c23e77dChris Lattner continue; 91897f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner } 919eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 9206157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // If the visibilities of the symbols disagree and the destination is a 9216157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // prototype, take the visibility of its input. 9226157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (DGV->isDeclaration()) 9236157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner DGV->setVisibility(SF->getVisibility()); 924eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 9256157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (LinkFromSrc) { 9266157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (isa<GlobalAlias>(DGV)) 9276157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner return Error(Err, "Function-Alias Collision on '" + SF->getName() + 9286157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner "': symbol multiple defined"); 929eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 9306157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // We have a definition of the same name but different type in the 9316157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // source module. Copy the prototype to the destination and replace 9326157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // uses of the destination's prototype with the new prototype. 9336157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner Function *NewDF = Function::Create(SF->getFunctionType(), NewLinkage, 9346157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner SF->getName(), Dest); 9356157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner CopyGVAttributes(NewDF, SF); 936eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 9376157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Any uses of DF need to change to NewDF, with cast 93879e86252208848020e0b13d77b8c6918e92b8328Michael J. Spencer DGV->replaceAllUsesWith(ConstantExpr::getBitCast(NewDF, 939c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson DGV->getType())); 940eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 9416157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // DF will conflict with NewDF because they both had the same. We must 9426157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // erase this now so ForceRenaming doesn't assert because DF might 943eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov // not have internal linkage. 9446157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (GlobalVariable *Var = dyn_cast<GlobalVariable>(DGV)) 9456157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner Var->eraseFromParent(); 9466157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner else 9476157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner cast<Function>(DGV)->eraseFromParent(); 948eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 9496157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // If the symbol table renamed the function, but it is an externally 950eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov // visible symbol, DF must be an existing function with internal 9516157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // linkage. Rename it. 952bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (NewDF->getName() != SF->getName() && !NewDF->hasLocalLinkage()) 9536157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner ForceRenaming(NewDF, SF->getName()); 954eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 9556157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Remember this mapping so uses in the source module get remapped 95605ea54e8869a81b8dd846397175f218f97968907Dan Gohman // later by MapValue. 9576157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner ValueMap[SF] = NewDF; 958822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner continue; 959822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner } 960eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 9616157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Not "link from source", keep the one in the DestModule and remap the 9626157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // input onto it. 963eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 9646157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (isa<GlobalAlias>(DGV)) { 9656157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // The only valid mappings are: 9666157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // - SF is external declaration, which is effectively a no-op. 9676157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // - SF is weak, when we just need to throw SF out. 968a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands if (!SF->isDeclaration() && !SF->isWeakForLinker()) 9696157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner return Error(Err, "Function-Alias Collision on '" + SF->getName() + 9706157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner "': symbol multiple defined"); 971822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner } 9726157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 9736157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Set calculated linkage 9746157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner DGV->setLinkage(NewLinkage); 9756157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 9766157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Make sure to remember this mapping. 977baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson ValueMap[SF] = ConstantExpr::getBitCast(DGV, SF->getType()); 9785c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 9795c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 9805c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 9815c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 982c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBody - Copy the source function over into the dest function and 983c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// fix up references to values. At this point we know that Dest is an external 984c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function, and that Src is not. 9854bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattnerstatic bool LinkFunctionBody(Function *Dest, Function *Src, 98605ea54e8869a81b8dd846397175f218f97968907Dan Gohman ValueToValueMapTy &ValueMap, 9875c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 9885cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer assert(Src && Dest && Dest->isDeclaration() && !Src->isDeclaration()); 9895c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 9900033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner // Go through and convert function arguments over, remembering the mapping. 991e4d5c441e04bdc00ccf1804744af670655123b07Chris Lattner Function::arg_iterator DI = Dest->arg_begin(); 992e4d5c441e04bdc00ccf1804744af670655123b07Chris Lattner for (Function::arg_iterator I = Src->arg_begin(), E = Src->arg_end(); 99369da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner I != E; ++I, ++DI) { 9946bc41e8a74d1756da0003641bfebd02a3d6d9586Owen Anderson DI->setName(I->getName()); // Copy the name information over... 9955c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 9965c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Add a mapping to our local map 997817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[I] = DI; 9985c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 9995c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10004bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner // Splice the body of the source function into the dest function. 10014bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner Dest->getBasicBlockList().splice(Dest->end(), Src->getBasicBlockList()); 10025c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 1003c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // At this point, all of the instructions and values of the function are now 1004c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // copied over. The only problem is that they are still referencing values in 1005c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // the Source function as operands. Loop through all of the operands of the 1006b5fa5fcecc97168a72c9533c84cf297c018b957cChris Lattner // functions and patch them up to point to the local versions. 100718961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Function::iterator BB = Dest->begin(), BE = Dest->end(); BB != BE; ++BB) 1008b5fa5fcecc97168a72c9533c84cf297c018b957cChris Lattner for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) 1009b5fa5fcecc97168a72c9533c84cf297c018b957cChris Lattner RemapInstruction(I, ValueMap, RF_IgnoreMissingEntries); 10100033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner 10110033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner // There is no need to map the arguments anymore. 10121127315562b221010040925980040fd4f65bdb1cChris Lattner for (Function::arg_iterator I = Src->arg_begin(), E = Src->arg_end(); 10131127315562b221010040925980040fd4f65bdb1cChris Lattner I != E; ++I) 1014ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ValueMap.erase(I); 10155c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10165c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 10175c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 10185c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10195c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 1020c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBodies - Link in the function bodies that are defined in the 1021c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// source module into the DestModule. This consists basically of copying the 1022c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function over and fixing up references to values. 10234bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattnerstatic bool LinkFunctionBodies(Module *Dest, Module *Src, 102405ea54e8869a81b8dd846397175f218f97968907Dan Gohman ValueToValueMapTy &ValueMap, 10255c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 10265c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10278bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer // Loop over all of the functions in the src module, mapping them over as we 10288bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer // go 10294bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner for (Module::iterator SF = Src->begin(), E = Src->end(); SF != E; ++SF) { 1030619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer if (!SF->isDeclaration()) { // No body if function is external 1031ec91ccba3ca92d5e1f19fb0cb6e57a7d4a3f3195Chris Lattner Function *DF = dyn_cast<Function>(ValueMap[SF]); // Destination function 1032c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner 103318961504fc2b299578dba817900a0696cf3ccc4dChris Lattner // DF not external SF external? 1034ec91ccba3ca92d5e1f19fb0cb6e57a7d4a3f3195Chris Lattner if (DF && DF->isDeclaration()) 103535956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner // Only provide the function body if there isn't one already. 103635956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner if (LinkFunctionBody(DF, SF, ValueMap, Err)) 103735956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner return true; 1038c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner } 10395c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 10405c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 10415c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 10425c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10438166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// LinkAppendingVars - If there were any appending global variables, link them 10448166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// together now. Return true on error. 10458166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattnerstatic bool LinkAppendingVars(Module *M, 10468166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 10478166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::string *ErrorMsg) { 10488166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (AppendingVars.empty()) return false; // Nothing to do. 1049f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 10508166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Loop over the multimap of appending vars, processing any variables with the 10518166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // same name, forming a new appending global variable with both of the 10528166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers merged together, then rewrite references to the old variables 10538166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // and delete them. 10548166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::vector<Constant*> Inits; 10558166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner while (AppendingVars.size() > 1) { 10568166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Get the first two elements in the map... 10578166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, 10588166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable*>::iterator Second = AppendingVars.begin(), First=Second++; 10598166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 10608166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If the first two elements are for different names, there is no pair... 10618166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Otherwise there is a pair, so link them together... 10628166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (First->first == Second->first) { 10638166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *G1 = First->second, *G2 = Second->second; 10648166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T1 = cast<ArrayType>(G1->getType()->getElementType()); 10658166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T2 = cast<ArrayType>(G2->getType()->getElementType()); 1066f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 10678166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Check to see that they two arrays agree on type... 10688166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (T1->getElementType() != T2->getElementType()) 10698166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 10708166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables with different element types need to be linked!"); 10718166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (G1->isConstant() != G2->isConstant()) 10728166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 10738166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables linked with different const'ness!"); 10748166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 10759613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio if (G1->getAlignment() != G2->getAlignment()) 10769613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio return Error(ErrorMsg, 10779613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio "Appending variables with different alignment need to be linked!"); 10789613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio 10799613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio if (G1->getVisibility() != G2->getVisibility()) 10809613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio return Error(ErrorMsg, 10819613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio "Appending variables with different visibility need to be linked!"); 10829613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio 10839613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio if (G1->getSection() != G2->getSection()) 10849613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio return Error(ErrorMsg, 10859613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio "Appending variables with different section name need to be linked!"); 1086eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 10878166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner unsigned NewSize = T1->getNumElements() + T2->getNumElements(); 108879e86252208848020e0b13d77b8c6918e92b8328Michael J. Spencer ArrayType *NewType = ArrayType::get(T1->getElementType(), 1089c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson NewSize); 10908166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 1091ed74a4ef3b813bed0c0f4bb5af42229d50133da2Chris Lattner G1->setName(""); // Clear G1's name in case of a conflict! 1092eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 10938166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Create the new global variable... 10948166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NG = 1095e9b11b431308f4766b73cda93e38ec930c912122Owen Anderson new GlobalVariable(*M, NewType, G1->isConstant(), G1->getLinkage(), 1096e9b11b431308f4766b73cda93e38ec930c912122Owen Anderson /*init*/0, First->first, 0, G1->isThreadLocal(), 1097a534b0f7bf0248bf90afe97110a34777e972f325Chris Lattner G1->getType()->getAddressSpace()); 10988166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 10999613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio // Propagate alignment, visibility and section info. 11009613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio CopyGVAttributes(NG, G1); 11019613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio 11028166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Merge the initializer... 11038166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.reserve(NewSize); 1104de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if (ConstantArray *I = dyn_cast<ConstantArray>(G1->getInitializer())) { 1105de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i) 1106cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos Inits.push_back(I->getOperand(i)); 1107de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } else { 1108de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner assert(isa<ConstantAggregateZero>(G1->getInitializer())); 1109a7235ea7245028a0723e8ab7fd011386b3900777Owen Anderson Constant *CV = Constant::getNullValue(T1->getElementType()); 1110de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i) 1111de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(CV); 1112de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } 1113de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if (ConstantArray *I = dyn_cast<ConstantArray>(G2->getInitializer())) { 1114de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i) 1115cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos Inits.push_back(I->getOperand(i)); 1116de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } else { 1117de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner assert(isa<ConstantAggregateZero>(G2->getInitializer())); 1118a7235ea7245028a0723e8ab7fd011386b3900777Owen Anderson Constant *CV = Constant::getNullValue(T2->getElementType()); 1119de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i) 1120de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(CV); 1121de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } 11221fd7096407d5e598ed3366a1141548e71273f1c5Owen Anderson NG->setInitializer(ConstantArray::get(NewType, Inits)); 11238166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.clear(); 11248166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11258166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Replace any uses of the two global variables with uses of the new 11268166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // global... 11278166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11288166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // FIXME: This should rewrite simple/straight-forward uses such as 11298166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // getelementptr instructions to not use the Cast! 1130baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson G1->replaceAllUsesWith(ConstantExpr::getBitCast(NG, 1131c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson G1->getType())); 113279e86252208848020e0b13d77b8c6918e92b8328Michael J. Spencer G2->replaceAllUsesWith(ConstantExpr::getBitCast(NG, 1133c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson G2->getType())); 11348166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11358166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Remove the two globals from the module now... 11368166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G1); 11378166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G2); 11388166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11398166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Put the new global into the AppendingVars map so that we can handle 11408166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // linking of more than two vars... 11418166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Second->second = NG; 11428166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 11438166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.erase(First); 11448166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 11458166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11468166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return false; 11478166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner} 114852f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 11499f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikovstatic bool ResolveAliases(Module *Dest) { 11509f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikov for (Module::alias_iterator I = Dest->alias_begin(), E = Dest->alias_end(); 11515241957b1f6876452705f94e0ed60dd2c33a5c84Anton Korobeynikov I != E; ++I) 11523472246edee4e120e3eb1ec4ad443ba884bc7ac7David Chisnall // We can't sue resolveGlobalAlias here because we need to preserve 11533472246edee4e120e3eb1ec4ad443ba884bc7ac7David Chisnall // bitcasts and GEPs. 11543472246edee4e120e3eb1ec4ad443ba884bc7ac7David Chisnall if (const Constant *C = I->getAliasee()) { 11553472246edee4e120e3eb1ec4ad443ba884bc7ac7David Chisnall while (dyn_cast<GlobalAlias>(C)) 11563472246edee4e120e3eb1ec4ad443ba884bc7ac7David Chisnall C = cast<GlobalAlias>(C)->getAliasee(); 11573472246edee4e120e3eb1ec4ad443ba884bc7ac7David Chisnall const GlobalValue *GV = dyn_cast<GlobalValue>(C); 11583472246edee4e120e3eb1ec4ad443ba884bc7ac7David Chisnall if (C != I && !(GV && GV->isDeclaration())) 11593472246edee4e120e3eb1ec4ad443ba884bc7ac7David Chisnall I->replaceAllUsesWith(const_cast<Constant*>(C)); 11603472246edee4e120e3eb1ec4ad443ba884bc7ac7David Chisnall } 11619f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikov 11629f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikov return false; 11639f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikov} 116452f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 116552f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// LinkModules - This function links two modules together, with the resulting 116652f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// left module modified to be the composite of the two input modules. If an 116752f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// error occurs, true is returned and ErrorMsg (if not null) is set to indicate 11685c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// the problem. Upon failure, the Dest module could be in a modified state, and 11695c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// shouldn't be relied on to be consistent. 1170f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukmanbool 11710ba9e211bed7813949aaca97e6b15579c8188e05Reid SpencerLinker::LinkModules(Module *Dest, Module *Src, std::string *ErrorMsg) { 117257a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer assert(Dest != 0 && "Invalid Destination module"); 117357a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer assert(Src != 0 && "Invalid Source Module"); 117457a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 1175c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Dest->getDataLayout().empty()) { 1176c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (!Src->getDataLayout().empty()) { 1177ec9bfdc152a870d3c62377ed6855fb3bff69511cChris Lattner Dest->setDataLayout(Src->getDataLayout()); 1178c36357c406911ded5a0e2924998d885815370fdbChris Lattner } else { 1179c36357c406911ded5a0e2924998d885815370fdbChris Lattner std::string DataLayout; 1180c36357c406911ded5a0e2924998d885815370fdbChris Lattner 1181a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov if (Dest->getEndianness() == Module::AnyEndianness) { 1182c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Src->getEndianness() == Module::BigEndian) 1183c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append("E"); 1184c36357c406911ded5a0e2924998d885815370fdbChris Lattner else if (Src->getEndianness() == Module::LittleEndian) 1185c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append("e"); 1186a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov } 1187a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov 1188a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov if (Dest->getPointerSize() == Module::AnyPointerSize) { 1189c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Src->getPointerSize() == Module::Pointer64) 1190c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append(DataLayout.length() == 0 ? "p:64:64" : "-p:64:64"); 1191c36357c406911ded5a0e2924998d885815370fdbChris Lattner else if (Src->getPointerSize() == Module::Pointer32) 1192c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append(DataLayout.length() == 0 ? "p:32:32" : "-p:32:32"); 1193a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov } 1194c36357c406911ded5a0e2924998d885815370fdbChris Lattner Dest->setDataLayout(DataLayout); 1195c36357c406911ded5a0e2924998d885815370fdbChris Lattner } 1196c36357c406911ded5a0e2924998d885815370fdbChris Lattner } 1197873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner 1198f27dfcb210fec571d79bc881f5463e0b405707c0Chris Lattner // Copy the target triple from the source to dest if the dest's is empty. 1199c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Dest->getTargetTriple().empty() && !Src->getTargetTriple().empty()) 1200c36357c406911ded5a0e2924998d885815370fdbChris Lattner Dest->setTargetTriple(Src->getTargetTriple()); 1201eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 1202c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (!Src->getDataLayout().empty() && !Dest->getDataLayout().empty() && 1203c36357c406911ded5a0e2924998d885815370fdbChris Lattner Src->getDataLayout() != Dest->getDataLayout()) 1204bdff548e4dd577a72094d57b282de4e765643b96Chris Lattner errs() << "WARNING: Linking two modules of different data layouts!\n"; 1205152f19ac6514ec29e183ddcdf2ea71599638dc4cChris Lattner if (!Src->getTargetTriple().empty() && 1206a797ee0210902669833720f9df7c3be5e58c1401Chris Lattner Dest->getTargetTriple() != Src->getTargetTriple()) { 1207a797ee0210902669833720f9df7c3be5e58c1401Chris Lattner errs() << "WARNING: Linking two modules of different target triples: "; 1208a797ee0210902669833720f9df7c3be5e58c1401Chris Lattner if (!Src->getModuleIdentifier().empty()) 1209a797ee0210902669833720f9df7c3be5e58c1401Chris Lattner errs() << Src->getModuleIdentifier() << ": "; 1210a797ee0210902669833720f9df7c3be5e58c1401Chris Lattner errs() << "'" << Src->getTargetTriple() << "' and '" 1211a797ee0210902669833720f9df7c3be5e58c1401Chris Lattner << Dest->getTargetTriple() << "'\n"; 1212a797ee0210902669833720f9df7c3be5e58c1401Chris Lattner } 1213f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 1214f27dfcb210fec571d79bc881f5463e0b405707c0Chris Lattner // Append the module inline asm string. 12156631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner if (!Src->getModuleInlineAsm().empty()) { 12166631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner if (Dest->getModuleInlineAsm().empty()) 12176631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner Dest->setModuleInlineAsm(Src->getModuleInlineAsm()); 1218e1b2e14f92e8e9da1eb4854511a881cf9c22af3cChris Lattner else 12196631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner Dest->setModuleInlineAsm(Dest->getModuleInlineAsm()+"\n"+ 12206631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner Src->getModuleInlineAsm()); 1221e1b2e14f92e8e9da1eb4854511a881cf9c22af3cChris Lattner } 1222eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 1223719012d6254ee425464f034250176283fb96793bReid Spencer // Update the destination module's dependent libraries list with the libraries 122457a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // from the source module. There's no opportunity for duplicates here as the 122557a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // Module ensures that duplicate insertions are discarded. 1226f27dfcb210fec571d79bc881f5463e0b405707c0Chris Lattner for (Module::lib_iterator SI = Src->lib_begin(), SE = Src->lib_end(); 1227eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov SI != SE; ++SI) 122857a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer Dest->addLibrary(*SI); 122957a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 12302c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // LinkTypes - Go through the symbol table of the Src module and see if any 12312c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // types are named in the src module that are not named in the Dst module. 12322c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Make sure there are no type name conflicts. 1233eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov if (LinkTypes(Dest, Src, ErrorMsg)) 1234619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer return true; 12352c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 12365c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // ValueMap - Mapping of values from what they used to be in Src, to what they 123705ea54e8869a81b8dd846397175f218f97968907Dan Gohman // are now in Dest. ValueToValueMapTy is a ValueMap, which involves some 123805ea54e8869a81b8dd846397175f218f97968907Dan Gohman // overhead due to the use of Value handles which the Linker doesn't actually 123905ea54e8869a81b8dd846397175f218f97968907Dan Gohman // need, but this allows us to reuse the ValueMapper code. 124005ea54e8869a81b8dd846397175f218f97968907Dan Gohman ValueToValueMapTy ValueMap; 12415c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 12428166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars - Keep track of global variables in the destination module 12438166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // with appending linkage. After the module is linked together, they are 12448166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // appended and the module is rewritten. 12458166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> AppendingVars; 12461127315562b221010040925980040fd4f65bdb1cChris Lattner for (Module::global_iterator I = Dest->global_begin(), E = Dest->global_end(); 12471127315562b221010040925980040fd4f65bdb1cChris Lattner I != E; ++I) { 12485a837defff581accc09048bea1cd839009e374a7Chris Lattner // Add all of the appending globals already in the Dest module to 12495a837defff581accc09048bea1cd839009e374a7Chris Lattner // AppendingVars. 1250f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner if (I->hasAppendingLinkage()) 1251f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner AppendingVars.insert(std::make_pair(I->getName(), I)); 12525a837defff581accc09048bea1cd839009e374a7Chris Lattner } 12535a837defff581accc09048bea1cd839009e374a7Chris Lattner 12548166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Insert all of the globals in src into the Dest module... without linking 12558166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers (which could refer to functions not yet mapped over). 1256ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (LinkGlobals(Dest, Src, ValueMap, AppendingVars, ErrorMsg)) 12575a837defff581accc09048bea1cd839009e374a7Chris Lattner return true; 12585c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 1259c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link the functions together between the two modules, without doing function 1260c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // bodies... this just adds external function prototypes to the Dest 1261c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // function... We do this so that when we begin processing function bodies, 1262c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // all of the global values that may be referenced are available in our 1263c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // ValueMap. 1264ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (LinkFunctionProtos(Dest, Src, ValueMap, ErrorMsg)) 12655a837defff581accc09048bea1cd839009e374a7Chris Lattner return true; 12665c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 12674fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov // If there were any alias, link them now. We really need to do this now, 12684fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov // because all of the aliases that may be referenced need to be available in 12694fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov // ValueMap 12704fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov if (LinkAlias(Dest, Src, ValueMap, ErrorMsg)) return true; 12714fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov 12726cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // Update the initializers in the Dest module now that all globals that may 12736cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // be referenced are in Dest. 12746cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner if (LinkGlobalInits(Dest, Src, ValueMap, ErrorMsg)) return true; 12756cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner 1276c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link in the function bodies that are defined in the source module into the 1277c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // DestModule. This consists basically of copying the function over and 1278c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // fixing up references to values. 127979df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner if (LinkFunctionBodies(Dest, Src, ValueMap, ErrorMsg)) return true; 128052f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 12818166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If there were any appending global variables, link them together now. 12828166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (LinkAppendingVars(Dest, AppendingVars, ErrorMsg)) return true; 12838166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 12843db9191baf5f5229a2f4d204c6332ba27fff81d0Anton Korobeynikov // Resolve all uses of aliases with aliasees 12853db9191baf5f5229a2f4d204c6332ba27fff81d0Anton Korobeynikov if (ResolveAliases(Dest)) return true; 12863db9191baf5f5229a2f4d204c6332ba27fff81d0Anton Korobeynikov 1287e422d1b16238ad4d9d7ef3b074715e795ab3ddc0Dan Gohman // Remap all of the named mdnoes in Src into the Dest module. We do this 1288e422d1b16238ad4d9d7ef3b074715e795ab3ddc0Dan Gohman // after linking GlobalValues so that MDNodes that reference GlobalValues 1289e422d1b16238ad4d9d7ef3b074715e795ab3ddc0Dan Gohman // are properly remapped. 1290e422d1b16238ad4d9d7ef3b074715e795ab3ddc0Dan Gohman LinkNamedMDNodes(Dest, Src, ValueMap); 1291e422d1b16238ad4d9d7ef3b074715e795ab3ddc0Dan Gohman 129257a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // If the source library's module id is in the dependent library list of the 129357a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // destination library, remove it since that module is now linked in. 1294738550910156b5cefdc0c12923ec8cc6982fb26fMichael J. Spencer const std::string &modId = Src->getModuleIdentifier(); 1295738550910156b5cefdc0c12923ec8cc6982fb26fMichael J. Spencer if (!modId.empty()) 1296738550910156b5cefdc0c12923ec8cc6982fb26fMichael J. Spencer Dest->removeLibrary(sys::path::stem(modId)); 129757a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 129852f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner return false; 129952f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner} 13009466f5113ba859677a28887c3c7143065e702019Vikram S. Adve 1301567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer// vim: sw=2 1302