LinkModules.cpp revision bb46f52027416598a662dc1c58f48d9d56b1a65b
1bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola //===- lib/Linker/LinkModules.cpp - Module Linker Implementation ----------===// 2f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman// 3b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// The LLVM Compiler Infrastructure 4b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// 54ee451de366474b9c228b4e5fa573795a715216dChris Lattner// This file is distributed under the University of Illinois Open Source 64ee451de366474b9c228b4e5fa573795a715216dChris Lattner// License. See LICENSE.TXT for details. 7f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman// 8b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell//===----------------------------------------------------------------------===// 952f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// 1052f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// This file implements the LLVM module linker. 1152f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// 1252f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// Specifically, this: 138d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// * Merges global variables between the two modules 148d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// * Uninit + Uninit = Init, Init + Uninit = Init, Init + Init = Error if != 15c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// * Merges functions between two modules 1652f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// 1752f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner//===----------------------------------------------------------------------===// 1852f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 197cc371a7958c7a049c679a59023c3c8c83f6cc83Reid Spencer#include "llvm/Linker.h" 20adbc0b5287bf36893cdcae2440d48b3cb3489e38Chris Lattner#include "llvm/Constants.h" 21adbc0b5287bf36893cdcae2440d48b3cb3489e38Chris Lattner#include "llvm/DerivedTypes.h" 225c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner#include "llvm/Module.h" 2378d033e086e19e016273de014f9214aa6f3f844bReid Spencer#include "llvm/TypeSymbolTable.h" 24ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer#include "llvm/ValueSymbolTable.h" 2547b14a4a6a455c7be169cfd312fcbe796f0ad426Misha Brukman#include "llvm/Instructions.h" 26adbc0b5287bf36893cdcae2440d48b3cb3489e38Chris Lattner#include "llvm/Assembly/Writer.h" 2741edad7e4b8872414564dea5fb41fa6194375355Bill Wendling#include "llvm/Support/Streams.h" 2857a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer#include "llvm/System/Path.h" 2962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner#include "llvm/ADT/DenseMap.h" 301a097e30d39e60303ae2b19f7a56e813f3e3c18eBill Wendling#include <sstream> 31f7703df4968084c18c248c1feea9961c19a32e6aChris Lattnerusing namespace llvm; 32d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke 335c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// Error - Simple wrapper function to conditionally assign to E and return true. 345c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// This just makes error return conditions a little bit simpler... 358166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattnerstatic inline bool Error(std::string *E, const std::string &Message) { 365c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner if (E) *E = Message; 375c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return true; 385c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 395c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 40700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Function: ResolveTypes() 41700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 42700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Description: 43700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Attempt to link the two specified types together. 44700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 45700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Inputs: 46700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// DestTy - The type to which we wish to resolve. 47700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// SrcTy - The original type which we want to resolve. 48700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 49700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Outputs: 50700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// DestST - The symbol table in which the new type should be placed. 51700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 52700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Return value: 53700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// true - There is an error and the types cannot yet be linked. 54700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// false - No errors. 554c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner// 56bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattnerstatic bool ResolveTypes(const Type *DestTy, const Type *SrcTy) { 57e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DestTy == SrcTy) return false; // If already equal, noop 58bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner assert(DestTy && SrcTy && "Can't handle null types"); 59e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 60bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner if (const OpaqueType *OT = dyn_cast<OpaqueType>(DestTy)) { 61bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner // Type _is_ in module, just opaque... 62bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner const_cast<OpaqueType*>(OT)->refineAbstractTypeTo(SrcTy); 63bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner } else if (const OpaqueType *OT = dyn_cast<OpaqueType>(SrcTy)) { 64bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner const_cast<OpaqueType*>(OT)->refineAbstractTypeTo(DestTy); 65bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner } else { 66bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner return true; // Cannot link types... not-equal and neither is opaque. 674c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 684c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner return false; 694c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner} 704c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 7162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner/// LinkerTypeMap - This implements a map of types that is stable 7262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner/// even if types are resolved/refined to other types. This is not a general 7362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner/// purpose map, it is specific to the linker's use. 7462a81a1eba019ab570b002f8e1686494139785a1Chris Lattnernamespace { 7562a81a1eba019ab570b002f8e1686494139785a1Chris Lattnerclass LinkerTypeMap : public AbstractTypeUser { 7662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner typedef DenseMap<const Type*, PATypeHolder> TheMapTy; 7762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner TheMapTy TheMap; 7862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 79fc196f9ee909ac35837f6f771a42aa0dec817584Chris Lattner LinkerTypeMap(const LinkerTypeMap&); // DO NOT IMPLEMENT 80fc196f9ee909ac35837f6f771a42aa0dec817584Chris Lattner void operator=(const LinkerTypeMap&); // DO NOT IMPLEMENT 81fc196f9ee909ac35837f6f771a42aa0dec817584Chris Lattnerpublic: 82fc196f9ee909ac35837f6f771a42aa0dec817584Chris Lattner LinkerTypeMap() {} 83fc196f9ee909ac35837f6f771a42aa0dec817584Chris Lattner ~LinkerTypeMap() { 8462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner for (DenseMap<const Type*, PATypeHolder>::iterator I = TheMap.begin(), 8562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner E = TheMap.end(); I != E; ++I) 8662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner I->first->removeAbstractTypeUser(this); 8762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 8862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 8962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// lookup - Return the value for the specified type or null if it doesn't 9062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// exist. 9162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner const Type *lookup(const Type *Ty) const { 9262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner TheMapTy::const_iterator I = TheMap.find(Ty); 9362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (I != TheMap.end()) return I->second; 9462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return 0; 9562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 9662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 9762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// erase - Remove the specified type, returning true if it was in the set. 9862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner bool erase(const Type *Ty) { 9962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (!TheMap.erase(Ty)) 10062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return false; 10162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (Ty->isAbstract()) 10262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner Ty->removeAbstractTypeUser(this); 10362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return true; 10462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 10562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 10662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// insert - This returns true if the pointer was new to the set, false if it 10762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// was already in the set. 10862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner bool insert(const Type *Src, const Type *Dst) { 1096b345ee9b2833cf1b2f79dc16d06d4060bec36efDan Gohman if (!TheMap.insert(std::make_pair(Src, PATypeHolder(Dst))).second) 11062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return false; // Already in map. 11162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (Src->isAbstract()) 11262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner Src->addAbstractTypeUser(this); 11362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return true; 11462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 11562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 11662a81a1eba019ab570b002f8e1686494139785a1Chris Lattnerprotected: 11762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// refineAbstractType - The callback method invoked when an abstract type is 11862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// resolved to another type. An object must override this method to update 11962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// its internal state to reference NewType instead of OldType. 12062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// 12162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner virtual void refineAbstractType(const DerivedType *OldTy, 12262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner const Type *NewTy) { 12362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner TheMapTy::iterator I = TheMap.find(OldTy); 12462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner const Type *DstTy = I->second; 12562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 12662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner TheMap.erase(I); 12762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (OldTy->isAbstract()) 12862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner OldTy->removeAbstractTypeUser(this); 12962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 13062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner // Don't reinsert into the map if the key is concrete now. 13162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (NewTy->isAbstract()) 13262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner insert(NewTy, DstTy); 13362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 13462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 13562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// The other case which AbstractTypeUsers must be aware of is when a type 13662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// makes the transition from being abstract (where it has clients on it's 13762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// AbstractTypeUsers list) to concrete (where it does not). This method 13862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// notifies ATU's when this occurs for a type. 13962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner virtual void typeBecameConcrete(const DerivedType *AbsTy) { 14062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner TheMap.erase(AbsTy); 14162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner AbsTy->removeAbstractTypeUser(this); 14262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 14362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 14462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner // for debugging... 14562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner virtual void dump() const { 14662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner cerr << "AbstractTypeSet!\n"; 14762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 14862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner}; 14962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner} 15062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 15162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 152e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// RecursiveResolveTypes - This is just like ResolveTypes, except that it 153e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// recurses down into derived types, merging the used types if the parent types 154e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// are compatible. 155a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattnerstatic bool RecursiveResolveTypesI(const Type *DstTy, const Type *SrcTy, 15662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner LinkerTypeMap &Pointers) { 157a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (DstTy == SrcTy) return false; // If already equal, noop 158f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 159e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // If we found our opaque type, resolve it now! 160a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (isa<OpaqueType>(DstTy) || isa<OpaqueType>(SrcTy)) 161a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner return ResolveTypes(DstTy, SrcTy); 162f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 163e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Two types cannot be resolved together if they are of different primitive 164e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // type. For example, we cannot resolve an int to a float. 165a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (DstTy->getTypeID() != SrcTy->getTypeID()) return true; 166e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 16756539659eb1b192d493aa333b60213889129b9f1Chris Lattner // If neither type is abstract, then they really are just different types. 168a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (!DstTy->isAbstract() && !SrcTy->isAbstract()) 16956539659eb1b192d493aa333b60213889129b9f1Chris Lattner return true; 17056539659eb1b192d493aa333b60213889129b9f1Chris Lattner 171e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Otherwise, resolve the used type used by this derived type... 172a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner switch (DstTy->getTypeID()) { 173f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner default: 174f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner return true; 175e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::FunctionTyID: { 176a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const FunctionType *DstFT = cast<FunctionType>(DstTy); 177a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const FunctionType *SrcFT = cast<FunctionType>(SrcTy); 1789ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner if (DstFT->isVarArg() != SrcFT->isVarArg() || 1799ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner DstFT->getNumContainedTypes() != SrcFT->getNumContainedTypes()) 18043f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return true; 181a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner 182a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner // Use TypeHolder's so recursive resolution won't break us. 183a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner PATypeHolder ST(SrcFT), DT(DstFT); 184a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner for (unsigned i = 0, e = DstFT->getNumContainedTypes(); i != e; ++i) { 185a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const Type *SE = ST->getContainedType(i), *DE = DT->getContainedType(i); 186a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (SE != DE && RecursiveResolveTypesI(DE, SE, Pointers)) 187e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return true; 188a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner } 189e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return false; 190e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 191e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::StructTyID: { 192a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const StructType *DstST = cast<StructType>(DstTy); 193a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const StructType *SrcST = cast<StructType>(SrcTy); 1949ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner if (DstST->getNumContainedTypes() != SrcST->getNumContainedTypes()) 195f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner return true; 196a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner 197a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner PATypeHolder ST(SrcST), DT(DstST); 198a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner for (unsigned i = 0, e = DstST->getNumContainedTypes(); i != e; ++i) { 199a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const Type *SE = ST->getContainedType(i), *DE = DT->getContainedType(i); 200a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (SE != DE && RecursiveResolveTypesI(DE, SE, Pointers)) 201e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return true; 202a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner } 203e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return false; 204e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 205e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::ArrayTyID: { 206a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const ArrayType *DAT = cast<ArrayType>(DstTy); 207a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const ArrayType *SAT = cast<ArrayType>(SrcTy); 208e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DAT->getNumElements() != SAT->getNumElements()) return true; 209e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner return RecursiveResolveTypesI(DAT->getElementType(), SAT->getElementType(), 210bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner Pointers); 211e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner } 212f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner case Type::VectorTyID: { 213a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const VectorType *DVT = cast<VectorType>(DstTy); 214a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const VectorType *SVT = cast<VectorType>(SrcTy); 215f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner if (DVT->getNumElements() != SVT->getNumElements()) return true; 216f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner return RecursiveResolveTypesI(DVT->getElementType(), SVT->getElementType(), 217f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner Pointers); 218f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner } 219e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner case Type::PointerTyID: { 220a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const PointerType *DstPT = cast<PointerType>(DstTy); 221a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const PointerType *SrcPT = cast<PointerType>(SrcTy); 2229ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner 2239ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner if (DstPT->getAddressSpace() != SrcPT->getAddressSpace()) 2249ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner return true; 2259ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner 226e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // If this is a pointer type, check to see if we have already seen it. If 227e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // so, we are in a recursive branch. Cut off the search now. We cannot use 228e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // an associative container for this search, because the type pointers (keys 22962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner // in the container) change whenever types get resolved. 23062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (SrcPT->isAbstract()) 23162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (const Type *ExistingDestTy = Pointers.lookup(SrcPT)) 23262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return ExistingDestTy != DstPT; 23362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 23462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (DstPT->isAbstract()) 23562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (const Type *ExistingSrcTy = Pointers.lookup(DstPT)) 23662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return ExistingSrcTy != SrcPT; 237e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // Otherwise, add the current pointers to the vector to stop recursion on 238e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // this pair. 23962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (DstPT->isAbstract()) 24062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner Pointers.insert(DstPT, SrcPT); 24162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (SrcPT->isAbstract()) 24262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner Pointers.insert(SrcPT, DstPT); 243a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner 2449ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner return RecursiveResolveTypesI(DstPT->getElementType(), 2459ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner SrcPT->getElementType(), Pointers); 246e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 247f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman } 248e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner} 249e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 250a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattnerstatic bool RecursiveResolveTypes(const Type *DestTy, const Type *SrcTy) { 25162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner LinkerTypeMap PointerTypes; 252bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner return RecursiveResolveTypesI(DestTy, SrcTy, PointerTypes); 253e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner} 254e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner 255e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 2562c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// LinkTypes - Go through the symbol table of the Src module and see if any 2572c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// types are named in the src module that are not named in the Dst module. 2582c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// Make sure there are no type name conflicts. 2595c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic bool LinkTypes(Module *Dest, const Module *Src, std::string *Err) { 26078d033e086e19e016273de014f9214aa6f3f844bReid Spencer TypeSymbolTable *DestST = &Dest->getTypeSymbolTable(); 26178d033e086e19e016273de014f9214aa6f3f844bReid Spencer const TypeSymbolTable *SrcST = &Src->getTypeSymbolTable(); 2622c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 2632c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Look for a type plane for Type's... 26478d033e086e19e016273de014f9214aa6f3f844bReid Spencer TypeSymbolTable::const_iterator TI = SrcST->begin(); 26578d033e086e19e016273de014f9214aa6f3f844bReid Spencer TypeSymbolTable::const_iterator TE = SrcST->end(); 266567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer if (TI == TE) return false; // No named types, do nothing. 2672c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 268cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // Some types cannot be resolved immediately because they depend on other 269cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // types being resolved to each other first. This contains a list of types we 270cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // are waiting to recheck. 2714c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner std::vector<std::string> DelayedTypesToResolve; 2724c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 273567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer for ( ; TI != TE; ++TI ) { 274567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer const std::string &Name = TI->first; 275c28a224c68adf0464c275778af4bce762ad25d37Reid Spencer const Type *RHS = TI->second; 2762c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 277bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner // Check to see if this type name is already in the dest module. 27878d033e086e19e016273de014f9214aa6f3f844bReid Spencer Type *Entry = DestST->lookup(Name); 2794c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 280bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner // If the name is just in the source module, bring it over to the dest. 281bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner if (Entry == 0) { 282bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner if (!Name.empty()) 283bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner DestST->insert(Name, const_cast<Type*>(RHS)); 284bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner } else if (ResolveTypes(Entry, RHS)) { 2854c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // They look different, save the types 'till later to resolve. 2864c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner DelayedTypesToResolve.push_back(Name); 2874c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 2884c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 2894c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 2904c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Iteratively resolve types while we can... 2914c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner while (!DelayedTypesToResolve.empty()) { 2924c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Loop over all of the types, attempting to resolve them if possible... 2934c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner unsigned OldSize = DelayedTypesToResolve.size(); 2944c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 295e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Try direct resolution by name... 2964c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner for (unsigned i = 0; i != DelayedTypesToResolve.size(); ++i) { 2974c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner const std::string &Name = DelayedTypesToResolve[i]; 29878d033e086e19e016273de014f9214aa6f3f844bReid Spencer Type *T1 = SrcST->lookup(Name); 29978d033e086e19e016273de014f9214aa6f3f844bReid Spencer Type *T2 = DestST->lookup(Name); 300bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner if (!ResolveTypes(T2, T1)) { 3014c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // We are making progress! 3024c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i); 3034c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner --i; 3042f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner } 3054c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 3062f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner 3074c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Did we not eliminate any types? 3084c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (DelayedTypesToResolve.size() == OldSize) { 309e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Attempt to resolve subelements of types. This allows us to merge these 310e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // two types: { int* } and { opaque* } 3114c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner for (unsigned i = 0, e = DelayedTypesToResolve.size(); i != e; ++i) { 3124c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner const std::string &Name = DelayedTypesToResolve[i]; 313a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (!RecursiveResolveTypes(SrcST->lookup(Name), DestST->lookup(Name))) { 314e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // We are making progress! 315e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i); 316f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 317e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Go back to the main loop, perhaps we can resolve directly by name 318e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // now... 319e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner break; 320e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 321e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 322e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 323e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // If we STILL cannot resolve the types, then there is something wrong. 324e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DelayedTypesToResolve.size() == OldSize) { 325aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner // Remove the symbol name from the destination. 326aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner DelayedTypesToResolve.pop_back(); 3274c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 3282c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner } 3292c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner } 3304c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 3314c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 3322c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner return false; 3332c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner} 3342c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 3350bb8757997392ee18ca9de0f1fab29463f8e7aebChris Lattner#ifndef NDEBUG 3365c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic void PrintMap(const std::map<const Value*, Value*> &M) { 3375c2d335d86579941b71816196a95a64b277e8963Chris Lattner for (std::map<const Value*, Value*>::const_iterator I = M.begin(), E =M.end(); 3382d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner I != E; ++I) { 339e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << " Fr: " << (void*)I->first << " "; 34087182ae6baf28ca6da6ee4bc00cf1857f293acfeChris Lattner I->first->dump(); 341e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << " To: " << (void*)I->second << " "; 34287182ae6baf28ca6da6ee4bc00cf1857f293acfeChris Lattner I->second->dump(); 343e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << "\n"; 3442d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner } 3452d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner} 3460bb8757997392ee18ca9de0f1fab29463f8e7aebChris Lattner#endif 3472d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 3482d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 349619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer// RemapOperand - Use ValueMap to convert constants from one module to another. 3505c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic Value *RemapOperand(const Value *In, 3510033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner std::map<const Value*, Value*> &ValueMap) { 3520033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner std::map<const Value*,Value*>::const_iterator I = ValueMap.find(In); 353ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (I != ValueMap.end()) 354ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer return I->second; 3555c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 356619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer // Check to see if it's a constant that we are interested in transforming. 357620fd68b1086b4d99b23951357299bee357aa62aChris Lattner Value *Result = 0; 35818961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (const Constant *CPV = dyn_cast<Constant>(In)) { 359de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if ((!isa<DerivedType>(CPV->getType()) && !isa<ConstantExpr>(CPV)) || 360a54b7cbd452b3adb2f51346140d996b29c2cdb30Reid Spencer isa<ConstantInt>(CPV) || isa<ConstantAggregateZero>(CPV)) 3610033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner return const_cast<Constant*>(CPV); // Simple constants stay identical. 3628d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 36318961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (const ConstantArray *CPA = dyn_cast<ConstantArray>(CPV)) { 364cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos std::vector<Constant*> Operands(CPA->getNumOperands()); 365cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i) 3660033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner Operands[i] =cast<Constant>(RemapOperand(CPA->getOperand(i), ValueMap)); 367e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Result = ConstantArray::get(cast<ArrayType>(CPA->getType()), Operands); 36818961504fc2b299578dba817900a0696cf3ccc4dChris Lattner } else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(CPV)) { 369cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos std::vector<Constant*> Operands(CPS->getNumOperands()); 370cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i) 3710033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner Operands[i] =cast<Constant>(RemapOperand(CPS->getOperand(i), ValueMap)); 372e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Result = ConstantStruct::get(cast<StructType>(CPS->getType()), Operands); 373b976e668165e1875a8f1eb7af800e33bb1e4393dChris Lattner } else if (isa<ConstantPointerNull>(CPV) || isa<UndefValue>(CPV)) { 37418961504fc2b299578dba817900a0696cf3ccc4dChris Lattner Result = const_cast<Constant*>(CPV); 3759d6565a5b1fbc4286d6ee638d8f47a3171a9ed7eReid Spencer } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CPV)) { 376a88eb9287eb14ba62ca6324b2b249e0ae9fe3309Chris Lattner std::vector<Constant*> Operands(CP->getNumOperands()); 377a88eb9287eb14ba62ca6324b2b249e0ae9fe3309Chris Lattner for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i) 378a88eb9287eb14ba62ca6324b2b249e0ae9fe3309Chris Lattner Operands[i] = cast<Constant>(RemapOperand(CP->getOperand(i), ValueMap)); 3799d6565a5b1fbc4286d6ee638d8f47a3171a9ed7eReid Spencer Result = ConstantVector::get(Operands); 3806cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) { 38127d672136a57519095a3ef20161697749cffb57cChris Lattner std::vector<Constant*> Ops; 38227d672136a57519095a3ef20161697749cffb57cChris Lattner for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) 38327d672136a57519095a3ef20161697749cffb57cChris Lattner Ops.push_back(cast<Constant>(RemapOperand(CE->getOperand(i),ValueMap))); 38427d672136a57519095a3ef20161697749cffb57cChris Lattner Result = CE->getWithOperands(Ops); 3858d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } else { 3860bb8757997392ee18ca9de0f1fab29463f8e7aebChris Lattner assert(!isa<GlobalValue>(CPV) && "Unmapped global?"); 3878d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner assert(0 && "Unknown type of derived type constant value!"); 3888d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 389620fd68b1086b4d99b23951357299bee357aa62aChris Lattner } else if (isa<InlineAsm>(In)) { 390620fd68b1086b4d99b23951357299bee357aa62aChris Lattner Result = const_cast<Value*>(In); 391620fd68b1086b4d99b23951357299bee357aa62aChris Lattner } 392620fd68b1086b4d99b23951357299bee357aa62aChris Lattner 393619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer // Cache the mapping in our local map structure 394620fd68b1086b4d99b23951357299bee357aa62aChris Lattner if (Result) { 395817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[In] = Result; 3968d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return Result; 3978d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 3988bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer 3990bb8757997392ee18ca9de0f1fab29463f8e7aebChris Lattner#ifndef NDEBUG 400e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << "LinkModules ValueMap: \n"; 4010033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner PrintMap(ValueMap); 4022d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 403e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << "Couldn't remap value: " << (void*)In << " " << *In << "\n"; 4048d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner assert(0 && "Couldn't remap value!"); 4050bb8757997392ee18ca9de0f1fab29463f8e7aebChris Lattner#endif 4068d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return 0; 4075c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 4085c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4098bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer/// ForceRenaming - The LLVM SymbolTable class autorenames globals that conflict 4108bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer/// in the symbol table. This is good for all clients except for us. Go 4118bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer/// through the trouble to force this back. 412c003628a612d3687fb77088a5894314210a65385Chris Lattnerstatic void ForceRenaming(GlobalValue *GV, const std::string &Name) { 413c003628a612d3687fb77088a5894314210a65385Chris Lattner assert(GV->getName() != Name && "Can't force rename to self"); 414ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ValueSymbolTable &ST = GV->getParent()->getValueSymbolTable(); 415c003628a612d3687fb77088a5894314210a65385Chris Lattner 416c003628a612d3687fb77088a5894314210a65385Chris Lattner // If there is a conflict, rename the conflict. 41733f294930e0affa51c3818405741abd80cc90316Chris Lattner if (GlobalValue *ConflictGV = cast_or_null<GlobalValue>(ST.lookup(Name))) { 418bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola assert(ConflictGV->hasLocalLinkage() && 419ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer "Not conflicting with a static global, should link instead!"); 42033f294930e0affa51c3818405741abd80cc90316Chris Lattner GV->takeName(ConflictGV); 42133f294930e0affa51c3818405741abd80cc90316Chris Lattner ConflictGV->setName(Name); // This will cause ConflictGV to get renamed 422ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer assert(ConflictGV->getName() != Name && "ForceRenaming didn't work"); 42333f294930e0affa51c3818405741abd80cc90316Chris Lattner } else { 42433f294930e0affa51c3818405741abd80cc90316Chris Lattner GV->setName(Name); // Force the name back 425ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer } 426ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer} 427ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer 428ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer/// CopyGVAttributes - copy additional attributes (those not needed to construct 429ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer/// a GlobalValue) from the SrcGV to the DestGV. 430ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencerstatic void CopyGVAttributes(GlobalValue *DestGV, const GlobalValue *SrcGV) { 43128c3cff8250b3fe2adc6479306fe7dbdb48a1bdbDuncan Sands // Use the maximum alignment, rather than just copying the alignment of SrcGV. 43228c3cff8250b3fe2adc6479306fe7dbdb48a1bdbDuncan Sands unsigned Alignment = std::max(DestGV->getAlignment(), SrcGV->getAlignment()); 43328c3cff8250b3fe2adc6479306fe7dbdb48a1bdbDuncan Sands DestGV->copyAttributesFrom(SrcGV); 43428c3cff8250b3fe2adc6479306fe7dbdb48a1bdbDuncan Sands DestGV->setAlignment(Alignment); 435c003628a612d3687fb77088a5894314210a65385Chris Lattner} 436c003628a612d3687fb77088a5894314210a65385Chris Lattner 437aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// GetLinkageResult - This analyzes the two global values and determines what 438aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// the result will look like in the destination module. In particular, it 439aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// computes the resultant linkage type, computes whether the global in the 440aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// source should be copied over to the destination (replacing the existing 4419cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov/// one), and computes whether this linkage is an error or not. It also performs 4429cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov/// visibility checks: we cannot link together two symbols with different 4439cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov/// visibilities. 444968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikovstatic bool GetLinkageResult(GlobalValue *Dest, const GlobalValue *Src, 445aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner GlobalValue::LinkageTypes <, bool &LinkFromSrc, 446aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner std::string *Err) { 447bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola assert((!Dest || !Src->hasLocalLinkage()) && 448aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "If Src has internal linkage, Dest shouldn't be set!"); 449aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (!Dest) { 450aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // Linking something to nothing. 451aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 452aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 4535cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer } else if (Src->isDeclaration()) { 4542b48ef0450944c2c46633aec9baf6be835a3b503Anton Korobeynikov // If Src is external or if both Src & Dest are external.. Just link the 455aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // external globals, we aren't adding anything. 456b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov if (Src->hasDLLImportLinkage()) { 45778ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // If one of GVs has DLLImport linkage, result should be dllimport'ed. 4585cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer if (Dest->isDeclaration()) { 459b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LinkFromSrc = true; 460b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LT = Src->getLinkage(); 461b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } 4628753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth } else if (Dest->hasExternalWeakLinkage()) { 4638753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth //If the Dest is weak, use the source linkage 4648753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth LinkFromSrc = true; 4658753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth LT = Src->getLinkage(); 466b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } else { 467b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LinkFromSrc = false; 468b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LT = Dest->getLinkage(); 469b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } 4705cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer } else if (Dest->isDeclaration() && !Dest->hasDLLImportLinkage()) { 471aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // If Dest is external but Src is not: 472aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 473aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 474aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else if (Src->hasAppendingLinkage() || Dest->hasAppendingLinkage()) { 475aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (Src->getLinkage() != Dest->getLinkage()) 476aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner return Error(Err, "Linking globals named '" + Src->getName() + 477aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "': can only link appending global with another appending global!"); 478aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; // Special cased. 479aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 4805df3186f598163258fabf3448d9372843804d1abDuncan Sands } else if (Src->mayBeOverridden()) { 481aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen // At this point we know that Dest has LinkOnce, External*, Weak, Common, 482aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen // or DLL* linkage. 48380585f1daac3570f19cd255c5006dfcf2ff65a89Anton Korobeynikov if ((Dest->hasLinkOnceLinkage() && 484aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen (Src->hasWeakLinkage() || Src->hasCommonLinkage())) || 48578ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Dest->hasExternalWeakLinkage()) { 486aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 487aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 488aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else { 489aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = false; 490aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Dest->getLinkage(); 491aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 4925df3186f598163258fabf3448d9372843804d1abDuncan Sands } else if (Dest->mayBeOverridden()) { 49378ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // At this point we know that Src has External* or DLL* linkage. 49478ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov if (Src->hasExternalWeakLinkage()) { 49578ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LinkFromSrc = false; 49678ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LT = Dest->getLinkage(); 49778ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov } else { 49878ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LinkFromSrc = true; 49978ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LT = GlobalValue::ExternalLinkage; 50078ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov } 501aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else { 502b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov assert((Dest->hasExternalLinkage() || 503b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov Dest->hasDLLImportLinkage() || 50478ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Dest->hasDLLExportLinkage() || 50578ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Dest->hasExternalWeakLinkage()) && 506b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov (Src->hasExternalLinkage() || 507b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov Src->hasDLLImportLinkage() || 50878ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Src->hasDLLExportLinkage() || 50978ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Src->hasExternalWeakLinkage()) && 510aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "Unexpected linkage type!"); 511f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman return Error(Err, "Linking globals named '" + Src->getName() + 512aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "': symbol multiply defined!"); 513aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 5149cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov 5159cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov // Check visibility 5169cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov if (Dest && Src->getVisibility() != Dest->getVisibility()) 51797f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner if (!Src->isDeclaration() && !Dest->isDeclaration()) 51897f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner return Error(Err, "Linking globals named '" + Src->getName() + 51997f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner "': symbols have different visibilities!"); 520aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner return false; 521aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner} 5225c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 5235c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// LinkGlobals - Loop through the global variables in the src module and merge 5248166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// them into the dest module. 525968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikovstatic bool LinkGlobals(Module *Dest, const Module *Src, 5265c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 5278166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 5285c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 529d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner ValueSymbolTable &DestSymTab = Dest->getValueSymbolTable(); 530d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner 5315c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 5320bb8757997392ee18ca9de0f1fab29463f8e7aebChris Lattner for (Module::const_global_iterator I = Src->global_begin(), 5330bb8757997392ee18ca9de0f1fab29463f8e7aebChris Lattner E = Src->global_end(); I != E; ++I) { 534968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov const GlobalVariable *SGV = I; 53501f69399352380532d480f6749daed660f50b15cAnton Korobeynikov GlobalValue *DGV = 0; 53601f69399352380532d480f6749daed660f50b15cAnton Korobeynikov 537d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // Check to see if may have to link the global with the global, alias or 538d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // function. 539bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (SGV->hasName() && !SGV->hasLocalLinkage()) 540d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner DGV = cast_or_null<GlobalValue>(DestSymTab.lookup(SGV->getNameStart(), 541d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner SGV->getNameEnd())); 542d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner 543ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner // If we found a global with the same name in the dest module, but it has 544ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner // internal linkage, we are really not doing any linkage here. 545bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (DGV && DGV->hasLocalLinkage()) 546ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner DGV = 0; 547ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner 548d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // If types don't agree due to opaque types, try to resolve them. 549d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner if (DGV && DGV->getType() != SGV->getType()) 550d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner RecursiveResolveTypes(SGV->getType(), DGV->getType()); 55101f69399352380532d480f6749daed660f50b15cAnton Korobeynikov 552c318329a1098a19137398af4d880f4d8cdd9cd8dDan Gohman assert((SGV->hasInitializer() || SGV->hasExternalWeakLinkage() || 553c318329a1098a19137398af4d880f4d8cdd9cd8dDan Gohman SGV->hasExternalLinkage() || SGV->hasDLLImportLinkage()) && 5544ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner "Global must either be external or have an initializer!"); 5555c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 556b324bd735ff5c99a52cd3c3f5d01c0e1398a2d3aChris Lattner GlobalValue::LinkageTypes NewLinkage = GlobalValue::InternalLinkage; 557b324bd735ff5c99a52cd3c3f5d01c0e1398a2d3aChris Lattner bool LinkFromSrc = false; 558aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (GetLinkageResult(DGV, SGV, NewLinkage, LinkFromSrc, Err)) 559aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner return true; 5600fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner 5616157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (DGV == 0) { 5625c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // No linking to be performed, simply create an identical version of the 5638d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // symbol over in the dest module... the initializer will be filled in 564d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // later by LinkGlobalInits. 5652719bac90525985f4ebb97324b4c087d47b54384Chris Lattner GlobalVariable *NewDGV = 5662719bac90525985f4ebb97324b4c087d47b54384Chris Lattner new GlobalVariable(SGV->getType()->getElementType(), 5672719bac90525985f4ebb97324b4c087d47b54384Chris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 568a534b0f7bf0248bf90afe97110a34777e972f325Chris Lattner SGV->getName(), Dest, false, 569a534b0f7bf0248bf90afe97110a34777e972f325Chris Lattner SGV->getType()->getAddressSpace()); 570471feac1b297b9458de18d973af371bf7f10296bReid Spencer // Propagate alignment, visibility and section info. 571ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer CopyGVAttributes(NewDGV, SGV); 5725dfbaf1fe3fa6914095cc55cde20b1ed25187b56Andrew Lenharth 5732719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // If the LLVM runtime renamed the global, but it is an externally visible 5742719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // symbol, DGV must be an existing global with internal linkage. Rename 5752719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // it. 576bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (!NewDGV->hasLocalLinkage() && NewDGV->getName() != SGV->getName()) 577c003628a612d3687fb77088a5894314210a65385Chris Lattner ForceRenaming(NewDGV, SGV->getName()); 5785c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 5796157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Make sure to remember this mapping. 580817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[SGV] = NewDGV; 581817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov 582d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // Keep track that this is an appending variable. 5838166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (SGV->hasAppendingLinkage()) 5848166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV)); 5856157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner continue; 5866157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner } 5876157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 5886157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // If the visibilities of the symbols disagree and the destination is a 5896157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // prototype, take the visibility of its input. 5906157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (DGV->isDeclaration()) 5916157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner DGV->setVisibility(SGV->getVisibility()); 5926157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 5936157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (DGV->hasAppendingLinkage()) { 5948166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // No linking is performed yet. Just insert a new copy of the global, and 5958166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // keep track of the fact that it is an appending variable in the 5968166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars map. The name is cleared out so that no linkage is 5978166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // performed. 5988166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NewDGV = 5998166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner new GlobalVariable(SGV->getType()->getElementType(), 6008166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 601a534b0f7bf0248bf90afe97110a34777e972f325Chris Lattner "", Dest, false, 602a534b0f7bf0248bf90afe97110a34777e972f325Chris Lattner SGV->getType()->getAddressSpace()); 6038166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 60475c7915c3a24f8063c274ccffe2dc9b7bc8bce1fAnton Korobeynikov // Set alignment allowing CopyGVAttributes merge it with alignment of SGV. 605ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer NewDGV->setAlignment(DGV->getAlignment()); 60675c7915c3a24f8063c274ccffe2dc9b7bc8bce1fAnton Korobeynikov // Propagate alignment, section and visibility info. 607ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer CopyGVAttributes(NewDGV, SGV); 6085dfbaf1fe3fa6914095cc55cde20b1ed25187b56Andrew Lenharth 6098166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Make sure to remember this mapping... 610817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[SGV] = NewDGV; 6118166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 6128166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Keep track that this is an appending variable... 6138166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV)); 6146157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner continue; 6156157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner } 6166157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 6176157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (LinkFromSrc) { 6186157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (isa<GlobalAlias>(DGV)) 6191438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Global-Alias Collision on '" + SGV->getName() + 6201438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': symbol multiple defined"); 6216157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 622d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // If the types don't match, and if we are to link from the source, nuke 623d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // DGV and create a new one of the appropriate type. Note that the thing 624d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // we are replacing may be a function (if a prototype, weak, etc) or a 625d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // global variable. 626d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner GlobalVariable *NewDGV = 6276157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner new GlobalVariable(SGV->getType()->getElementType(), SGV->isConstant(), 6286157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner NewLinkage, /*init*/0, DGV->getName(), Dest, false, 629d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner SGV->getType()->getAddressSpace()); 630d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner 631d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // Propagate alignment, section, and visibility info. 632d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner CopyGVAttributes(NewDGV, SGV); 633d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner DGV->replaceAllUsesWith(ConstantExpr::getBitCast(NewDGV, DGV->getType())); 634d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner 635d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // DGV will conflict with NewDGV because they both had the same 636d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // name. We must erase this now so ForceRenaming doesn't assert 637d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // because DGV might not have internal linkage. 638d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner if (GlobalVariable *Var = dyn_cast<GlobalVariable>(DGV)) 639d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner Var->eraseFromParent(); 640d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner else 641d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner cast<Function>(DGV)->eraseFromParent(); 642d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner DGV = NewDGV; 643d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner 644d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // If the symbol table renamed the global, but it is an externally visible 645d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // symbol, DGV must be an existing global with internal linkage. Rename. 646bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (NewDGV->getName() != SGV->getName() && !NewDGV->hasLocalLinkage()) 647d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner ForceRenaming(NewDGV, SGV->getName()); 648d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner 6496157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Inherit const as appropriate. 650d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner NewDGV->setConstant(SGV->isConstant()); 651d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner 6526157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Make sure to remember this mapping. 6536157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner ValueMap[SGV] = NewDGV; 6546157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner continue; 6555c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 6566157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 6576157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Not "link from source", keep the one in the DestModule and remap the 6586157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // input onto it. 6596157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 6606157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Special case for const propagation. 6616157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (GlobalVariable *DGVar = dyn_cast<GlobalVariable>(DGV)) 6626157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (DGVar->isDeclaration() && SGV->isConstant() && !DGVar->isConstant()) 6636157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner DGVar->setConstant(true); 6646157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 665d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // SGV is global, but DGV is alias. 666d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov if (isa<GlobalAlias>(DGV)) { 667d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // The only valid mappings are: 668d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // - SGV is external declaration, which is effectively a no-op. 669d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // - SGV is weak, when we just need to throw SGV out. 670d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov if (!SGV->isDeclaration() && !SGV->mayBeOverridden()) 671d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov return Error(Err, "Global-Alias Collision on '" + SGV->getName() + 672d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov "': symbol multiple defined"); 673d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov } 6746157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 6756157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Set calculated linkage 6766157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner DGV->setLinkage(NewLinkage); 6776157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 6786157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Make sure to remember this mapping... 6796157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner ValueMap[SGV] = ConstantExpr::getBitCast(DGV, SGV->getType()); 6805c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 6815c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 6825c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 6835c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 68458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikovstatic GlobalValue::LinkageTypes 68558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton KorobeynikovCalculateAliasLinkage(const GlobalValue *SGV, const GlobalValue *DGV) { 68658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov if (SGV->hasExternalLinkage() || DGV->hasExternalLinkage()) 68758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov return GlobalValue::ExternalLinkage; 68858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov else if (SGV->hasWeakLinkage() || DGV->hasWeakLinkage()) 68958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov return GlobalValue::WeakLinkage; 690bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola else if (SGV->hasInternalLinkage() && DGV->hasInternalLinkage()) 69158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov return GlobalValue::InternalLinkage; 692bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola else { 693bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola assert (SGV->hasPrivateLinkage() && DGV->hasPrivateLinkage() && 694bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola "Unexpected linkage type"); 695bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola return GlobalValue::PrivateLinkage; 69658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } 69758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov} 69858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 69931ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio// LinkAlias - Loop through the alias in the src module and link them into the 70058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov// dest module. We're assuming, that all functions/global variables were already 70158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov// linked in. 7024fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikovstatic bool LinkAlias(Module *Dest, const Module *Src, 7034fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov std::map<const Value*, Value*> &ValueMap, 7044fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov std::string *Err) { 70531ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio // Loop over all alias in the src module 70631ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio for (Module::const_alias_iterator I = Src->alias_begin(), 70731ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio E = Src->alias_end(); I != E; ++I) { 70858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov const GlobalAlias *SGA = I; 70958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov const GlobalValue *SAliasee = SGA->getAliasedGlobal(); 71058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov GlobalAlias *NewGA = NULL; 71158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 71258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Globals were already linked, thus we can just query ValueMap for variant 713caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // of SAliasee in Dest. 71458d5e051574339106ce4139697ebadd21e34dbc0Ted Kremenek std::map<const Value*,Value*>::const_iterator VMI = ValueMap.find(SAliasee); 71558d5e051574339106ce4139697ebadd21e34dbc0Ted Kremenek assert(VMI != ValueMap.end() && "Aliasee not linked"); 71658d5e051574339106ce4139697ebadd21e34dbc0Ted Kremenek GlobalValue* DAliasee = cast<GlobalValue>(VMI->second); 717caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov GlobalValue* DGV = NULL; 71858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 71958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Try to find something 'similar' to SGA in destination module. 720bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (!DGV && !SGA->hasLocalLinkage()) { 721caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGV = Dest->getNamedAlias(SGA->getName()); 722caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 723caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // If types don't agree due to opaque types, try to resolve them. 724caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (DGV && DGV->getType() != SGA->getType()) 7255ed2ba26680f06846e7602ce65432b0a723b1273Chris Lattner RecursiveResolveTypes(SGA->getType(), DGV->getType()); 726caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } 727caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 728bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (!DGV && !SGA->hasLocalLinkage()) { 729caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGV = Dest->getGlobalVariable(SGA->getName()); 730caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 73158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // If types don't agree due to opaque types, try to resolve them. 732caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (DGV && DGV->getType() != SGA->getType()) 7335ed2ba26680f06846e7602ce65432b0a723b1273Chris Lattner RecursiveResolveTypes(SGA->getType(), DGV->getType()); 734caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } 73558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 736bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (!DGV && !SGA->hasLocalLinkage()) { 737caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGV = Dest->getFunction(SGA->getName()); 738caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 739caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // If types don't agree due to opaque types, try to resolve them. 740caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (DGV && DGV->getType() != SGA->getType()) 7415ed2ba26680f06846e7602ce65432b0a723b1273Chris Lattner RecursiveResolveTypes(SGA->getType(), DGV->getType()); 742caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } 743caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 744caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // No linking to be performed on internal stuff. 745bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (DGV && DGV->hasLocalLinkage()) 746caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGV = NULL; 747caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 748caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (GlobalAlias *DGA = dyn_cast_or_null<GlobalAlias>(DGV)) { 749caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // Types are known to be the same, check whether aliasees equal. As 75058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // globals are already linked we just need query ValueMap to find the 75158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // mapping. 75258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov if (DAliasee == DGA->getAliasedGlobal()) { 75358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // This is just two copies of the same alias. Propagate linkage, if 75458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // necessary. 75558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov DGA->setLinkage(CalculateAliasLinkage(SGA, DGA)); 75658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 75758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov NewGA = DGA; 75858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Proceed to 'common' steps 75958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } else 7601438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Alias Collision on '" + SGA->getName()+ 7611438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': aliases have different aliasees"); 762caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } else if (GlobalVariable *DGVar = dyn_cast_or_null<GlobalVariable>(DGV)) { 763f88bc65932e5cf41ba6ca706cd1b1b1f65300248Anton Korobeynikov // The only allowed way is to link alias with external declaration or weak 764f88bc65932e5cf41ba6ca706cd1b1b1f65300248Anton Korobeynikov // symbol.. 7655df3186f598163258fabf3448d9372843804d1abDuncan Sands if (DGVar->isDeclaration() || DGVar->mayBeOverridden()) { 766ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov // But only if aliasee is global too... 767ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov if (!isa<GlobalVariable>(DAliasee)) 768caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov return Error(Err, "Global-Alias Collision on '" + SGA->getName() + 769caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov "': aliasee is not global variable"); 770ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov 77158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov NewGA = new GlobalAlias(SGA->getType(), SGA->getLinkage(), 77258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov SGA->getName(), DAliasee, Dest); 77358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov CopyGVAttributes(NewGA, SGA); 77458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 77558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Any uses of DGV need to change to NewGA, with cast, if needed. 776caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (SGA->getType() != DGVar->getType()) 777caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGVar->replaceAllUsesWith(ConstantExpr::getBitCast(NewGA, 778caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGVar->getType())); 77958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov else 780caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGVar->replaceAllUsesWith(NewGA); 78158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 782caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // DGVar will conflict with NewGA because they both had the same 78358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // name. We must erase this now so ForceRenaming doesn't assert 78458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // because DGV might not have internal linkage. 785caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGVar->eraseFromParent(); 78658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 78758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Proceed to 'common' steps 78858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } else 7891438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Global-Alias Collision on '" + SGA->getName() + 7901438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': symbol multiple defined"); 791caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } else if (Function *DF = dyn_cast_or_null<Function>(DGV)) { 792f88bc65932e5cf41ba6ca706cd1b1b1f65300248Anton Korobeynikov // The only allowed way is to link alias with external declaration or weak 793f88bc65932e5cf41ba6ca706cd1b1b1f65300248Anton Korobeynikov // symbol... 7945df3186f598163258fabf3448d9372843804d1abDuncan Sands if (DF->isDeclaration() || DF->mayBeOverridden()) { 795ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov // But only if aliasee is function too... 796ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov if (!isa<Function>(DAliasee)) 797caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov return Error(Err, "Function-Alias Collision on '" + SGA->getName() + 798caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov "': aliasee is not function"); 799ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov 800b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov NewGA = new GlobalAlias(SGA->getType(), SGA->getLinkage(), 801b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov SGA->getName(), DAliasee, Dest); 802b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov CopyGVAttributes(NewGA, SGA); 803b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov 804b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // Any uses of DF need to change to NewGA, with cast, if needed. 805b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov if (SGA->getType() != DF->getType()) 806b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov DF->replaceAllUsesWith(ConstantExpr::getBitCast(NewGA, 807b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov DF->getType())); 808b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov else 809b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov DF->replaceAllUsesWith(NewGA); 810b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov 811b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // DF will conflict with NewGA because they both had the same 812b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // name. We must erase this now so ForceRenaming doesn't assert 813b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // because DF might not have internal linkage. 814b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov DF->eraseFromParent(); 815b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov 816b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // Proceed to 'common' steps 817b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov } else 8181438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Function-Alias Collision on '" + SGA->getName() + 8191438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': symbol multiple defined"); 82058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } else { 821caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // No linking to be performed, simply create an identical version of the 822caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // alias over in the dest module... 82358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 82458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov NewGA = new GlobalAlias(SGA->getType(), SGA->getLinkage(), 82558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov SGA->getName(), DAliasee, Dest); 82658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov CopyGVAttributes(NewGA, SGA); 82758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 82858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Proceed to 'common' steps 82958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } 83058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 83158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov assert(NewGA && "No alias was created in destination module!"); 83258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 833b8cdaf7099898d7c0eef4769bf6a89f39e7decc2Anton Korobeynikov // If the symbol table renamed the alias, but it is an externally visible 834caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // symbol, DGA must be an global value with internal linkage. Rename it. 83558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov if (NewGA->getName() != SGA->getName() && 836bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola !NewGA->hasLocalLinkage()) 83758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov ForceRenaming(NewGA, SGA->getName()); 83858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 83958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Remember this mapping so uses in the source module get remapped 84058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // later by RemapOperand. 841817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[SGA] = NewGA; 84231ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio } 84358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 84431ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio return false; 84531ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio} 84631ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio 8475c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 8488d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// LinkGlobalInits - Update the initializers in the Dest module now that all 8498d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// globals that may be referenced are in Dest. 8508d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattnerstatic bool LinkGlobalInits(Module *Dest, const Module *Src, 8515c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 8525c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 8538d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 8541127315562b221010040925980040fd4f65bdb1cChris Lattner for (Module::const_global_iterator I = Src->global_begin(), 8551127315562b221010040925980040fd4f65bdb1cChris Lattner E = Src->global_end(); I != E; ++I) { 85618961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const GlobalVariable *SGV = I; 8578d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 8588d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner if (SGV->hasInitializer()) { // Only process initialized GV's 8598d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Figure out what the initializer looks like in the dest module... 8604ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner Constant *SInit = 8610033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner cast<Constant>(RemapOperand(SGV->getInitializer(), ValueMap)); 862d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // Grab destination global variable or alias. 863d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov GlobalValue *DGV = cast<GlobalValue>(ValueMap[SGV]->stripPointerCasts()); 864d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov 865d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // If dest if global variable, check that initializers match. 866d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov if (GlobalVariable *DGVar = dyn_cast<GlobalVariable>(DGV)) { 867d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov if (DGVar->hasInitializer()) { 868d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov if (SGV->hasExternalLinkage()) { 869d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov if (DGVar->getInitializer() != SInit) 870d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov return Error(Err, "Global Variable Collision on '" + 871d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov SGV->getName() + 872d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov "': global variables have different initializers"); 873d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov } else if (DGVar->mayBeOverridden()) { 874d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // Nothing is required, mapped values will take the new global 875d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // automatically. 876d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov } else if (SGV->mayBeOverridden()) { 877d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // Nothing is required, mapped values will take the new global 878d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // automatically. 879d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov } else if (DGVar->hasAppendingLinkage()) { 880d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov assert(0 && "Appending linkage unimplemented!"); 881d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov } else { 882d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov assert(0 && "Unknown linkage!"); 883d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov } 8844ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else { 885d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // Copy the initializer over now... 886d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov DGVar->setInitializer(SInit); 8874ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } 8888d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } else { 889d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // Destination is alias, the only valid situation is when source is 890d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // weak. Also, note, that we already checked linkage in LinkGlobals(), 891d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // thus we assert here. 892d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // FIXME: Should we weaken this assumption, 'dereference' alias and 893d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // check for initializer of aliasee? 894d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov assert(SGV->mayBeOverridden()); 8958d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 8968d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 8978d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 8988d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return false; 8998d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner} 9005c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 90179df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner// LinkFunctionProtos - Link the functions together between the two modules, 902c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// without doing function bodies... this just adds external function prototypes 903c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// to the Dest function... 9045c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 90579df7c0aaa18129e55968c8783ef8346807bd4afChris Lattnerstatic bool LinkFunctionProtos(Module *Dest, const Module *Src, 9065c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 9075c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 908d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner ValueSymbolTable &DestSymTab = Dest->getValueSymbolTable(); 909d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner 910619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer // Loop over all of the functions in the src module, mapping them over 9115c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner for (Module::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) { 91218961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const Function *SF = I; // SrcFunction 913194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov GlobalValue *DGV = 0; 914824684982968244050e56357e736b9940c23e77dChris Lattner 915d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // Check to see if may have to link the function with the global, alias or 916d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // function. 917bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (SF->hasName() && !SF->hasLocalLinkage()) 918d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner DGV = cast_or_null<GlobalValue>(DestSymTab.lookup(SF->getNameStart(), 919d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner SF->getNameEnd())); 920d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner 921ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner // If we found a global with the same name in the dest module, but it has 922ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner // internal linkage, we are really not doing any linkage here. 923bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (DGV && DGV->hasLocalLinkage()) 924ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner DGV = 0; 925ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner 926d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // If types don't agree due to opaque types, try to resolve them. 927d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner if (DGV && DGV->getType() != SF->getType()) 928d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner RecursiveResolveTypes(SF->getType(), DGV->getType()); 929194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov 9306157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner GlobalValue::LinkageTypes NewLinkage = GlobalValue::InternalLinkage; 9316157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner bool LinkFromSrc = false; 9326157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (GetLinkageResult(DGV, SF, NewLinkage, LinkFromSrc, Err)) 9336157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner return true; 9346157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 935824684982968244050e56357e736b9940c23e77dChris Lattner // If there is no linkage to be performed, just bring over SF without 936824684982968244050e56357e736b9940c23e77dChris Lattner // modifying it. 937194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov if (DGV == 0) { 938824684982968244050e56357e736b9940c23e77dChris Lattner // Function does not already exist, simply insert an function signature 939824684982968244050e56357e736b9940c23e77dChris Lattner // identical to SF into the dest module. 940824684982968244050e56357e736b9940c23e77dChris Lattner Function *NewDF = Function::Create(SF->getFunctionType(), 941824684982968244050e56357e736b9940c23e77dChris Lattner SF->getLinkage(), 942824684982968244050e56357e736b9940c23e77dChris Lattner SF->getName(), Dest); 943824684982968244050e56357e736b9940c23e77dChris Lattner CopyGVAttributes(NewDF, SF); 944824684982968244050e56357e736b9940c23e77dChris Lattner 945824684982968244050e56357e736b9940c23e77dChris Lattner // If the LLVM runtime renamed the function, but it is an externally 946824684982968244050e56357e736b9940c23e77dChris Lattner // visible symbol, DF must be an existing function with internal linkage. 947824684982968244050e56357e736b9940c23e77dChris Lattner // Rename it. 948bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (!NewDF->hasLocalLinkage() && NewDF->getName() != SF->getName()) 949824684982968244050e56357e736b9940c23e77dChris Lattner ForceRenaming(NewDF, SF->getName()); 950824684982968244050e56357e736b9940c23e77dChris Lattner 951824684982968244050e56357e736b9940c23e77dChris Lattner // ... and remember this mapping... 952824684982968244050e56357e736b9940c23e77dChris Lattner ValueMap[SF] = NewDF; 953824684982968244050e56357e736b9940c23e77dChris Lattner continue; 95497f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner } 955ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer 9566157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // If the visibilities of the symbols disagree and the destination is a 9576157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // prototype, take the visibility of its input. 9586157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (DGV->isDeclaration()) 9596157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner DGV->setVisibility(SF->getVisibility()); 960824684982968244050e56357e736b9940c23e77dChris Lattner 9616157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (LinkFromSrc) { 9626157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (isa<GlobalAlias>(DGV)) 9636157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner return Error(Err, "Function-Alias Collision on '" + SF->getName() + 9646157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner "': symbol multiple defined"); 9656157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 9666157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // We have a definition of the same name but different type in the 9676157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // source module. Copy the prototype to the destination and replace 9686157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // uses of the destination's prototype with the new prototype. 9696157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner Function *NewDF = Function::Create(SF->getFunctionType(), NewLinkage, 9706157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner SF->getName(), Dest); 9716157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner CopyGVAttributes(NewDF, SF); 9726157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 9736157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Any uses of DF need to change to NewDF, with cast 9746157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner DGV->replaceAllUsesWith(ConstantExpr::getBitCast(NewDF, DGV->getType())); 9756157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 9766157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // DF will conflict with NewDF because they both had the same. We must 9776157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // erase this now so ForceRenaming doesn't assert because DF might 9786157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // not have internal linkage. 9796157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (GlobalVariable *Var = dyn_cast<GlobalVariable>(DGV)) 9806157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner Var->eraseFromParent(); 9816157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner else 9826157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner cast<Function>(DGV)->eraseFromParent(); 9836157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 9846157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // If the symbol table renamed the function, but it is an externally 9856157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // visible symbol, DF must be an existing function with internal 9866157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // linkage. Rename it. 987bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (NewDF->getName() != SF->getName() && !NewDF->hasLocalLinkage()) 9886157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner ForceRenaming(NewDF, SF->getName()); 9896157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 9906157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Remember this mapping so uses in the source module get remapped 9916157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // later by RemapOperand. 9926157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner ValueMap[SF] = NewDF; 993822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner continue; 994822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner } 995822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner 9966157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Not "link from source", keep the one in the DestModule and remap the 9976157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // input onto it. 998822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner 9996157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (isa<GlobalAlias>(DGV)) { 10006157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // The only valid mappings are: 10016157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // - SF is external declaration, which is effectively a no-op. 10026157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // - SF is weak, when we just need to throw SF out. 1003e655e3703280d001375ffa44093f8f4ec879c77bAnton Korobeynikov if (!SF->isDeclaration() && !SF->mayBeOverridden()) 10046157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner return Error(Err, "Function-Alias Collision on '" + SF->getName() + 10056157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner "': symbol multiple defined"); 1006822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner } 10076157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 10086157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Set calculated linkage 10096157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner DGV->setLinkage(NewLinkage); 10106157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 10116157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Make sure to remember this mapping. 10126157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner ValueMap[SF] = ConstantExpr::getBitCast(DGV, SF->getType()); 10135c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 10145c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 10155c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 10165c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 1017c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBody - Copy the source function over into the dest function and 1018c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// fix up references to values. At this point we know that Dest is an external 1019c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function, and that Src is not. 10204bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattnerstatic bool LinkFunctionBody(Function *Dest, Function *Src, 1021ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer std::map<const Value*, Value*> &ValueMap, 10225c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 10235cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer assert(Src && Dest && Dest->isDeclaration() && !Src->isDeclaration()); 10245c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10250033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner // Go through and convert function arguments over, remembering the mapping. 1026e4d5c441e04bdc00ccf1804744af670655123b07Chris Lattner Function::arg_iterator DI = Dest->arg_begin(); 1027e4d5c441e04bdc00ccf1804744af670655123b07Chris Lattner for (Function::arg_iterator I = Src->arg_begin(), E = Src->arg_end(); 102869da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner I != E; ++I, ++DI) { 10296bc41e8a74d1756da0003641bfebd02a3d6d9586Owen Anderson DI->setName(I->getName()); // Copy the name information over... 10305c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10315c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Add a mapping to our local map 1032817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[I] = DI; 10335c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 10345c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10354bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner // Splice the body of the source function into the dest function. 10364bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner Dest->getBasicBlockList().splice(Dest->end(), Src->getBasicBlockList()); 10375c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 1038c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // At this point, all of the instructions and values of the function are now 1039c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // copied over. The only problem is that they are still referencing values in 1040c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // the Source function as operands. Loop through all of the operands of the 1041c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // functions and patch them up to point to the local versions... 10425c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 104318961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Function::iterator BB = Dest->begin(), BE = Dest->end(); BB != BE; ++BB) 104418961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) 104518961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Instruction::op_iterator OI = I->op_begin(), OE = I->op_end(); 1046221d688a5ef21a22c2368c9fff0e92d7966c95e5Chris Lattner OI != OE; ++OI) 10474bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner if (!isa<Instruction>(*OI) && !isa<BasicBlock>(*OI)) 1048ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer *OI = RemapOperand(*OI, ValueMap); 10490033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner 10500033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner // There is no need to map the arguments anymore. 10511127315562b221010040925980040fd4f65bdb1cChris Lattner for (Function::arg_iterator I = Src->arg_begin(), E = Src->arg_end(); 10521127315562b221010040925980040fd4f65bdb1cChris Lattner I != E; ++I) 1053ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ValueMap.erase(I); 10545c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10555c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 10565c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 10575c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10585c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 1059c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBodies - Link in the function bodies that are defined in the 1060c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// source module into the DestModule. This consists basically of copying the 1061c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function over and fixing up references to values. 10624bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattnerstatic bool LinkFunctionBodies(Module *Dest, Module *Src, 10635c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 10645c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 10655c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10668bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer // Loop over all of the functions in the src module, mapping them over as we 10678bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer // go 10684bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner for (Module::iterator SF = Src->begin(), E = Src->end(); SF != E; ++SF) { 1069619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer if (!SF->isDeclaration()) { // No body if function is external 1070ec91ccba3ca92d5e1f19fb0cb6e57a7d4a3f3195Chris Lattner Function *DF = dyn_cast<Function>(ValueMap[SF]); // Destination function 1071c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner 107218961504fc2b299578dba817900a0696cf3ccc4dChris Lattner // DF not external SF external? 1073ec91ccba3ca92d5e1f19fb0cb6e57a7d4a3f3195Chris Lattner if (DF && DF->isDeclaration()) 107435956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner // Only provide the function body if there isn't one already. 107535956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner if (LinkFunctionBody(DF, SF, ValueMap, Err)) 107635956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner return true; 1077c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner } 10785c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 10795c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 10805c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 10815c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10828166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// LinkAppendingVars - If there were any appending global variables, link them 10838166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// together now. Return true on error. 10848166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattnerstatic bool LinkAppendingVars(Module *M, 10858166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 10868166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::string *ErrorMsg) { 10878166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (AppendingVars.empty()) return false; // Nothing to do. 1088f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 10898166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Loop over the multimap of appending vars, processing any variables with the 10908166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // same name, forming a new appending global variable with both of the 10918166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers merged together, then rewrite references to the old variables 10928166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // and delete them. 10938166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::vector<Constant*> Inits; 10948166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner while (AppendingVars.size() > 1) { 10958166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Get the first two elements in the map... 10968166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, 10978166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable*>::iterator Second = AppendingVars.begin(), First=Second++; 10988166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 10998166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If the first two elements are for different names, there is no pair... 11008166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Otherwise there is a pair, so link them together... 11018166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (First->first == Second->first) { 11028166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *G1 = First->second, *G2 = Second->second; 11038166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T1 = cast<ArrayType>(G1->getType()->getElementType()); 11048166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T2 = cast<ArrayType>(G2->getType()->getElementType()); 1105f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 11068166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Check to see that they two arrays agree on type... 11078166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (T1->getElementType() != T2->getElementType()) 11088166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 11098166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables with different element types need to be linked!"); 11108166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (G1->isConstant() != G2->isConstant()) 11118166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 11128166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables linked with different const'ness!"); 11138166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11149613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio if (G1->getAlignment() != G2->getAlignment()) 11159613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio return Error(ErrorMsg, 11169613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio "Appending variables with different alignment need to be linked!"); 11179613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio 11189613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio if (G1->getVisibility() != G2->getVisibility()) 11199613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio return Error(ErrorMsg, 11209613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio "Appending variables with different visibility need to be linked!"); 11219613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio 11229613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio if (G1->getSection() != G2->getSection()) 11239613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio return Error(ErrorMsg, 11249613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio "Appending variables with different section name need to be linked!"); 11259613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio 11268166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner unsigned NewSize = T1->getNumElements() + T2->getNumElements(); 11278166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner ArrayType *NewType = ArrayType::get(T1->getElementType(), NewSize); 11288166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 1129ed74a4ef3b813bed0c0f4bb5af42229d50133da2Chris Lattner G1->setName(""); // Clear G1's name in case of a conflict! 1130ed74a4ef3b813bed0c0f4bb5af42229d50133da2Chris Lattner 11318166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Create the new global variable... 11328166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NG = 11338166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner new GlobalVariable(NewType, G1->isConstant(), G1->getLinkage(), 1134a534b0f7bf0248bf90afe97110a34777e972f325Chris Lattner /*init*/0, First->first, M, G1->isThreadLocal(), 1135a534b0f7bf0248bf90afe97110a34777e972f325Chris Lattner G1->getType()->getAddressSpace()); 11368166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11379613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio // Propagate alignment, visibility and section info. 11389613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio CopyGVAttributes(NG, G1); 11399613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio 11408166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Merge the initializer... 11418166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.reserve(NewSize); 1142de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if (ConstantArray *I = dyn_cast<ConstantArray>(G1->getInitializer())) { 1143de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i) 1144cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos Inits.push_back(I->getOperand(i)); 1145de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } else { 1146de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner assert(isa<ConstantAggregateZero>(G1->getInitializer())); 1147de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Constant *CV = Constant::getNullValue(T1->getElementType()); 1148de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i) 1149de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(CV); 1150de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } 1151de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if (ConstantArray *I = dyn_cast<ConstantArray>(G2->getInitializer())) { 1152de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i) 1153cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos Inits.push_back(I->getOperand(i)); 1154de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } else { 1155de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner assert(isa<ConstantAggregateZero>(G2->getInitializer())); 1156de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Constant *CV = Constant::getNullValue(T2->getElementType()); 1157de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i) 1158de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(CV); 1159de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } 11608166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner NG->setInitializer(ConstantArray::get(NewType, Inits)); 11618166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.clear(); 11628166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11638166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Replace any uses of the two global variables with uses of the new 11648166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // global... 11658166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11668166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // FIXME: This should rewrite simple/straight-forward uses such as 11678166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // getelementptr instructions to not use the Cast! 11684da49122f3f3c8da68a52723d846b88c72166a68Reid Spencer G1->replaceAllUsesWith(ConstantExpr::getBitCast(NG, G1->getType())); 11694da49122f3f3c8da68a52723d846b88c72166a68Reid Spencer G2->replaceAllUsesWith(ConstantExpr::getBitCast(NG, G2->getType())); 11708166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11718166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Remove the two globals from the module now... 11728166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G1); 11738166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G2); 11748166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11758166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Put the new global into the AppendingVars map so that we can handle 11768166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // linking of more than two vars... 11778166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Second->second = NG; 11788166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 11798166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.erase(First); 11808166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 11818166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11828166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return false; 11838166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner} 118452f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 11859f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikovstatic bool ResolveAliases(Module *Dest) { 11869f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikov for (Module::alias_iterator I = Dest->alias_begin(), E = Dest->alias_end(); 11875241957b1f6876452705f94e0ed60dd2c33a5c84Anton Korobeynikov I != E; ++I) 118819e861a4ffb896f16a691d5ac869e894df3cd464Anton Korobeynikov if (const GlobalValue *GV = I->resolveAliasedGlobal()) 1189832b2a9cd8870211bf2d347d7b435beacbb06c8dAnton Korobeynikov if (GV != I && !GV->isDeclaration()) 11905241957b1f6876452705f94e0ed60dd2c33a5c84Anton Korobeynikov I->replaceAllUsesWith(const_cast<GlobalValue*>(GV)); 11919f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikov 11929f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikov return false; 11939f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikov} 119452f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 119552f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// LinkModules - This function links two modules together, with the resulting 119652f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// left module modified to be the composite of the two input modules. If an 119752f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// error occurs, true is returned and ErrorMsg (if not null) is set to indicate 11985c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// the problem. Upon failure, the Dest module could be in a modified state, and 11995c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// shouldn't be relied on to be consistent. 1200f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukmanbool 12010ba9e211bed7813949aaca97e6b15579c8188e05Reid SpencerLinker::LinkModules(Module *Dest, Module *Src, std::string *ErrorMsg) { 120257a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer assert(Dest != 0 && "Invalid Destination module"); 120357a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer assert(Src != 0 && "Invalid Source Module"); 120457a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 1205c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Dest->getDataLayout().empty()) { 1206c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (!Src->getDataLayout().empty()) { 1207ec9bfdc152a870d3c62377ed6855fb3bff69511cChris Lattner Dest->setDataLayout(Src->getDataLayout()); 1208c36357c406911ded5a0e2924998d885815370fdbChris Lattner } else { 1209c36357c406911ded5a0e2924998d885815370fdbChris Lattner std::string DataLayout; 1210c36357c406911ded5a0e2924998d885815370fdbChris Lattner 1211a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov if (Dest->getEndianness() == Module::AnyEndianness) { 1212c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Src->getEndianness() == Module::BigEndian) 1213c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append("E"); 1214c36357c406911ded5a0e2924998d885815370fdbChris Lattner else if (Src->getEndianness() == Module::LittleEndian) 1215c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append("e"); 1216a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov } 1217a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov 1218a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov if (Dest->getPointerSize() == Module::AnyPointerSize) { 1219c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Src->getPointerSize() == Module::Pointer64) 1220c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append(DataLayout.length() == 0 ? "p:64:64" : "-p:64:64"); 1221c36357c406911ded5a0e2924998d885815370fdbChris Lattner else if (Src->getPointerSize() == Module::Pointer32) 1222c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append(DataLayout.length() == 0 ? "p:32:32" : "-p:32:32"); 1223a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov } 1224c36357c406911ded5a0e2924998d885815370fdbChris Lattner Dest->setDataLayout(DataLayout); 1225c36357c406911ded5a0e2924998d885815370fdbChris Lattner } 1226c36357c406911ded5a0e2924998d885815370fdbChris Lattner } 1227873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner 1228f27dfcb210fec571d79bc881f5463e0b405707c0Chris Lattner // Copy the target triple from the source to dest if the dest's is empty. 1229c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Dest->getTargetTriple().empty() && !Src->getTargetTriple().empty()) 1230c36357c406911ded5a0e2924998d885815370fdbChris Lattner Dest->setTargetTriple(Src->getTargetTriple()); 1231c36357c406911ded5a0e2924998d885815370fdbChris Lattner 1232c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (!Src->getDataLayout().empty() && !Dest->getDataLayout().empty() && 1233c36357c406911ded5a0e2924998d885815370fdbChris Lattner Src->getDataLayout() != Dest->getDataLayout()) 123426f238589f9bb372d24b6fb2bc32edbf046fd9eeReid Spencer cerr << "WARNING: Linking two modules of different data layouts!\n"; 1235152f19ac6514ec29e183ddcdf2ea71599638dc4cChris Lattner if (!Src->getTargetTriple().empty() && 1236152f19ac6514ec29e183ddcdf2ea71599638dc4cChris Lattner Dest->getTargetTriple() != Src->getTargetTriple()) 1237e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << "WARNING: Linking two modules of different target triples!\n"; 1238f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 1239f27dfcb210fec571d79bc881f5463e0b405707c0Chris Lattner // Append the module inline asm string. 12406631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner if (!Src->getModuleInlineAsm().empty()) { 12416631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner if (Dest->getModuleInlineAsm().empty()) 12426631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner Dest->setModuleInlineAsm(Src->getModuleInlineAsm()); 1243e1b2e14f92e8e9da1eb4854511a881cf9c22af3cChris Lattner else 12446631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner Dest->setModuleInlineAsm(Dest->getModuleInlineAsm()+"\n"+ 12456631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner Src->getModuleInlineAsm()); 1246e1b2e14f92e8e9da1eb4854511a881cf9c22af3cChris Lattner } 1247e1b2e14f92e8e9da1eb4854511a881cf9c22af3cChris Lattner 1248719012d6254ee425464f034250176283fb96793bReid Spencer // Update the destination module's dependent libraries list with the libraries 124957a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // from the source module. There's no opportunity for duplicates here as the 125057a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // Module ensures that duplicate insertions are discarded. 1251f27dfcb210fec571d79bc881f5463e0b405707c0Chris Lattner for (Module::lib_iterator SI = Src->lib_begin(), SE = Src->lib_end(); 1252f27dfcb210fec571d79bc881f5463e0b405707c0Chris Lattner SI != SE; ++SI) 125357a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer Dest->addLibrary(*SI); 125457a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 12552c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // LinkTypes - Go through the symbol table of the Src module and see if any 12562c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // types are named in the src module that are not named in the Dst module. 12572c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Make sure there are no type name conflicts. 1258619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer if (LinkTypes(Dest, Src, ErrorMsg)) 1259619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer return true; 12602c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 12615c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // ValueMap - Mapping of values from what they used to be in Src, to what they 12625c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // are now in Dest. 12635c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> ValueMap; 12645c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 12658166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars - Keep track of global variables in the destination module 12668166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // with appending linkage. After the module is linked together, they are 12678166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // appended and the module is rewritten. 12688166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> AppendingVars; 12691127315562b221010040925980040fd4f65bdb1cChris Lattner for (Module::global_iterator I = Dest->global_begin(), E = Dest->global_end(); 12701127315562b221010040925980040fd4f65bdb1cChris Lattner I != E; ++I) { 12715a837defff581accc09048bea1cd839009e374a7Chris Lattner // Add all of the appending globals already in the Dest module to 12725a837defff581accc09048bea1cd839009e374a7Chris Lattner // AppendingVars. 1273f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner if (I->hasAppendingLinkage()) 1274f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner AppendingVars.insert(std::make_pair(I->getName(), I)); 12755a837defff581accc09048bea1cd839009e374a7Chris Lattner } 12765a837defff581accc09048bea1cd839009e374a7Chris Lattner 12778166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Insert all of the globals in src into the Dest module... without linking 12788166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers (which could refer to functions not yet mapped over). 1279ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (LinkGlobals(Dest, Src, ValueMap, AppendingVars, ErrorMsg)) 12805a837defff581accc09048bea1cd839009e374a7Chris Lattner return true; 12815c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 1282c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link the functions together between the two modules, without doing function 1283c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // bodies... this just adds external function prototypes to the Dest 1284c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // function... We do this so that when we begin processing function bodies, 1285c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // all of the global values that may be referenced are available in our 1286c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // ValueMap. 1287ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (LinkFunctionProtos(Dest, Src, ValueMap, ErrorMsg)) 12885a837defff581accc09048bea1cd839009e374a7Chris Lattner return true; 12895c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 12904fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov // If there were any alias, link them now. We really need to do this now, 12914fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov // because all of the aliases that may be referenced need to be available in 12924fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov // ValueMap 12934fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov if (LinkAlias(Dest, Src, ValueMap, ErrorMsg)) return true; 12944fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov 12956cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // Update the initializers in the Dest module now that all globals that may 12966cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // be referenced are in Dest. 12976cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner if (LinkGlobalInits(Dest, Src, ValueMap, ErrorMsg)) return true; 12986cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner 1299c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link in the function bodies that are defined in the source module into the 1300c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // DestModule. This consists basically of copying the function over and 1301c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // fixing up references to values. 130279df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner if (LinkFunctionBodies(Dest, Src, ValueMap, ErrorMsg)) return true; 130352f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 13048166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If there were any appending global variables, link them together now. 13058166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (LinkAppendingVars(Dest, AppendingVars, ErrorMsg)) return true; 13068166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 13073db9191baf5f5229a2f4d204c6332ba27fff81d0Anton Korobeynikov // Resolve all uses of aliases with aliasees 13083db9191baf5f5229a2f4d204c6332ba27fff81d0Anton Korobeynikov if (ResolveAliases(Dest)) return true; 13093db9191baf5f5229a2f4d204c6332ba27fff81d0Anton Korobeynikov 131057a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // If the source library's module id is in the dependent library list of the 131157a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // destination library, remove it since that module is now linked in. 131257a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer sys::Path modId; 1313dd04df0ec33a903ee7fc747701bafde622f77d8bReid Spencer modId.set(Src->getModuleIdentifier()); 131407adb2836b8aa7a3872e33c285958f5937662b50Reid Spencer if (!modId.isEmpty()) 131507adb2836b8aa7a3872e33c285958f5937662b50Reid Spencer Dest->removeLibrary(modId.getBasename()); 131657a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 131752f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner return false; 131852f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner} 13199466f5113ba859677a28887c3c7143065e702019Vikram S. Adve 1320567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer// vim: sw=2 1321