LinkModules.cpp revision bdff548e4dd577a72094d57b282de4e765643b96
1c834bbf55832c45f90b1163f920472fefbf77bc1Mikhail Glushenkov//===- lib/Linker/LinkModules.cpp - Module Linker Implementation ----------===// 2f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman// 3b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// The LLVM Compiler Infrastructure 4b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// 54ee451de366474b9c228b4e5fa573795a715216dChris Lattner// This file is distributed under the University of Illinois Open Source 64ee451de366474b9c228b4e5fa573795a715216dChris Lattner// License. See LICENSE.TXT for details. 7f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman// 8b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell//===----------------------------------------------------------------------===// 952f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// 1052f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// This file implements the LLVM module linker. 1152f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// 1252f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// Specifically, this: 138d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// * Merges global variables between the two modules 148d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// * Uninit + Uninit = Init, Init + Uninit = Init, Init + Init = Error if != 15c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// * Merges functions between two modules 1652f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// 1752f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner//===----------------------------------------------------------------------===// 1852f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 197cc371a7958c7a049c679a59023c3c8c83f6cc83Reid Spencer#include "llvm/Linker.h" 20adbc0b5287bf36893cdcae2440d48b3cb3489e38Chris Lattner#include "llvm/Constants.h" 21adbc0b5287bf36893cdcae2440d48b3cb3489e38Chris Lattner#include "llvm/DerivedTypes.h" 22c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson#include "llvm/LLVMContext.h" 235c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner#include "llvm/Module.h" 2478d033e086e19e016273de014f9214aa6f3f844bReid Spencer#include "llvm/TypeSymbolTable.h" 25ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer#include "llvm/ValueSymbolTable.h" 2647b14a4a6a455c7be169cfd312fcbe796f0ad426Misha Brukman#include "llvm/Instructions.h" 27adbc0b5287bf36893cdcae2440d48b3cb3489e38Chris Lattner#include "llvm/Assembly/Writer.h" 28c25e7581b9b8088910da31702d4ca21c4734c6d7Torok Edwin#include "llvm/Support/ErrorHandling.h" 2957a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer#include "llvm/System/Path.h" 3062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner#include "llvm/ADT/DenseMap.h" 311a097e30d39e60303ae2b19f7a56e813f3e3c18eBill Wendling#include <sstream> 32f7703df4968084c18c248c1feea9961c19a32e6aChris Lattnerusing namespace llvm; 33d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke 345c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// Error - Simple wrapper function to conditionally assign to E and return true. 355c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// This just makes error return conditions a little bit simpler... 366e0d1cb30957a636c53158d3089e6fb88348a57aDaniel Dunbarstatic inline bool Error(std::string *E, const Twine &Message) { 376e0d1cb30957a636c53158d3089e6fb88348a57aDaniel Dunbar if (E) *E = Message.str(); 385c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return true; 395c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 405c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 41700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Function: ResolveTypes() 42700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 43700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Description: 44700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Attempt to link the two specified types together. 45700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 46700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Inputs: 47700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// DestTy - The type to which we wish to resolve. 48700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// SrcTy - The original type which we want to resolve. 49700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 50700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Outputs: 51700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// DestST - The symbol table in which the new type should be placed. 52700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 53700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Return value: 54700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// true - There is an error and the types cannot yet be linked. 55700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// false - No errors. 564c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner// 57bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattnerstatic bool ResolveTypes(const Type *DestTy, const Type *SrcTy) { 58e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DestTy == SrcTy) return false; // If already equal, noop 59bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner assert(DestTy && SrcTy && "Can't handle null types"); 60e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 61bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner if (const OpaqueType *OT = dyn_cast<OpaqueType>(DestTy)) { 62bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner // Type _is_ in module, just opaque... 63bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner const_cast<OpaqueType*>(OT)->refineAbstractTypeTo(SrcTy); 64bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner } else if (const OpaqueType *OT = dyn_cast<OpaqueType>(SrcTy)) { 65bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner const_cast<OpaqueType*>(OT)->refineAbstractTypeTo(DestTy); 66bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner } else { 67bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner return true; // Cannot link types... not-equal and neither is opaque. 684c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 694c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner return false; 704c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner} 714c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 7262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner/// LinkerTypeMap - This implements a map of types that is stable 7362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner/// even if types are resolved/refined to other types. This is not a general 7462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner/// purpose map, it is specific to the linker's use. 7562a81a1eba019ab570b002f8e1686494139785a1Chris Lattnernamespace { 7662a81a1eba019ab570b002f8e1686494139785a1Chris Lattnerclass LinkerTypeMap : public AbstractTypeUser { 7762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner typedef DenseMap<const Type*, PATypeHolder> TheMapTy; 7862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner TheMapTy TheMap; 79eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 80fc196f9ee909ac35837f6f771a42aa0dec817584Chris Lattner LinkerTypeMap(const LinkerTypeMap&); // DO NOT IMPLEMENT 81fc196f9ee909ac35837f6f771a42aa0dec817584Chris Lattner void operator=(const LinkerTypeMap&); // DO NOT IMPLEMENT 82fc196f9ee909ac35837f6f771a42aa0dec817584Chris Lattnerpublic: 83fc196f9ee909ac35837f6f771a42aa0dec817584Chris Lattner LinkerTypeMap() {} 84fc196f9ee909ac35837f6f771a42aa0dec817584Chris Lattner ~LinkerTypeMap() { 8562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner for (DenseMap<const Type*, PATypeHolder>::iterator I = TheMap.begin(), 8662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner E = TheMap.end(); I != E; ++I) 8762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner I->first->removeAbstractTypeUser(this); 8862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 89eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 9062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// lookup - Return the value for the specified type or null if it doesn't 9162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// exist. 9262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner const Type *lookup(const Type *Ty) const { 9362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner TheMapTy::const_iterator I = TheMap.find(Ty); 9462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (I != TheMap.end()) return I->second; 9562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return 0; 9662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 97eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 9862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// erase - Remove the specified type, returning true if it was in the set. 9962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner bool erase(const Type *Ty) { 10062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (!TheMap.erase(Ty)) 10162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return false; 10262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (Ty->isAbstract()) 10362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner Ty->removeAbstractTypeUser(this); 10462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return true; 10562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 106eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 10762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// insert - This returns true if the pointer was new to the set, false if it 10862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// was already in the set. 10962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner bool insert(const Type *Src, const Type *Dst) { 1106b345ee9b2833cf1b2f79dc16d06d4060bec36efDan Gohman if (!TheMap.insert(std::make_pair(Src, PATypeHolder(Dst))).second) 11162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return false; // Already in map. 11262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (Src->isAbstract()) 11362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner Src->addAbstractTypeUser(this); 11462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return true; 11562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 116eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 11762a81a1eba019ab570b002f8e1686494139785a1Chris Lattnerprotected: 11862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// refineAbstractType - The callback method invoked when an abstract type is 11962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// resolved to another type. An object must override this method to update 12062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// its internal state to reference NewType instead of OldType. 12162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// 12262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner virtual void refineAbstractType(const DerivedType *OldTy, 12362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner const Type *NewTy) { 12462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner TheMapTy::iterator I = TheMap.find(OldTy); 12562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner const Type *DstTy = I->second; 126eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 12762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner TheMap.erase(I); 12862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (OldTy->isAbstract()) 12962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner OldTy->removeAbstractTypeUser(this); 13062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 13162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner // Don't reinsert into the map if the key is concrete now. 13262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (NewTy->isAbstract()) 13362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner insert(NewTy, DstTy); 13462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 135eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 13662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// The other case which AbstractTypeUsers must be aware of is when a type 13762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// makes the transition from being abstract (where it has clients on it's 13862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// AbstractTypeUsers list) to concrete (where it does not). This method 13962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// notifies ATU's when this occurs for a type. 14062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner virtual void typeBecameConcrete(const DerivedType *AbsTy) { 14162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner TheMap.erase(AbsTy); 14262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner AbsTy->removeAbstractTypeUser(this); 14362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 144eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 14562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner // for debugging... 14662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner virtual void dump() const { 147bdff548e4dd577a72094d57b282de4e765643b96Chris Lattner errs() << "AbstractTypeSet!\n"; 14862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 14962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner}; 15062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner} 15162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 15262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 153e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// RecursiveResolveTypes - This is just like ResolveTypes, except that it 154e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// recurses down into derived types, merging the used types if the parent types 155e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// are compatible. 156a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattnerstatic bool RecursiveResolveTypesI(const Type *DstTy, const Type *SrcTy, 15762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner LinkerTypeMap &Pointers) { 158a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (DstTy == SrcTy) return false; // If already equal, noop 159f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 160e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // If we found our opaque type, resolve it now! 161a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (isa<OpaqueType>(DstTy) || isa<OpaqueType>(SrcTy)) 162a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner return ResolveTypes(DstTy, SrcTy); 163f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 164e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Two types cannot be resolved together if they are of different primitive 165e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // type. For example, we cannot resolve an int to a float. 166a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (DstTy->getTypeID() != SrcTy->getTypeID()) return true; 167e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 16856539659eb1b192d493aa333b60213889129b9f1Chris Lattner // If neither type is abstract, then they really are just different types. 169a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (!DstTy->isAbstract() && !SrcTy->isAbstract()) 17056539659eb1b192d493aa333b60213889129b9f1Chris Lattner return true; 171eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 172e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Otherwise, resolve the used type used by this derived type... 173a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner switch (DstTy->getTypeID()) { 174f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner default: 175f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner return true; 176e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::FunctionTyID: { 177a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const FunctionType *DstFT = cast<FunctionType>(DstTy); 178a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const FunctionType *SrcFT = cast<FunctionType>(SrcTy); 1799ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner if (DstFT->isVarArg() != SrcFT->isVarArg() || 1809ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner DstFT->getNumContainedTypes() != SrcFT->getNumContainedTypes()) 18143f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return true; 182eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 183a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner // Use TypeHolder's so recursive resolution won't break us. 184a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner PATypeHolder ST(SrcFT), DT(DstFT); 185a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner for (unsigned i = 0, e = DstFT->getNumContainedTypes(); i != e; ++i) { 186a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const Type *SE = ST->getContainedType(i), *DE = DT->getContainedType(i); 187a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (SE != DE && RecursiveResolveTypesI(DE, SE, Pointers)) 188e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return true; 189a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner } 190e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return false; 191e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 192e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::StructTyID: { 193a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const StructType *DstST = cast<StructType>(DstTy); 194a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const StructType *SrcST = cast<StructType>(SrcTy); 1959ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner if (DstST->getNumContainedTypes() != SrcST->getNumContainedTypes()) 196f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner return true; 197eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 198a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner PATypeHolder ST(SrcST), DT(DstST); 199a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner for (unsigned i = 0, e = DstST->getNumContainedTypes(); i != e; ++i) { 200a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const Type *SE = ST->getContainedType(i), *DE = DT->getContainedType(i); 201a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (SE != DE && RecursiveResolveTypesI(DE, SE, Pointers)) 202e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return true; 203a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner } 204e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return false; 205e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 206e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::ArrayTyID: { 207a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const ArrayType *DAT = cast<ArrayType>(DstTy); 208a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const ArrayType *SAT = cast<ArrayType>(SrcTy); 209e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DAT->getNumElements() != SAT->getNumElements()) return true; 210e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner return RecursiveResolveTypesI(DAT->getElementType(), SAT->getElementType(), 211bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner Pointers); 212e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner } 213f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner case Type::VectorTyID: { 214a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const VectorType *DVT = cast<VectorType>(DstTy); 215a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const VectorType *SVT = cast<VectorType>(SrcTy); 216f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner if (DVT->getNumElements() != SVT->getNumElements()) return true; 217f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner return RecursiveResolveTypesI(DVT->getElementType(), SVT->getElementType(), 218f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner Pointers); 219f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner } 220e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner case Type::PointerTyID: { 221a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const PointerType *DstPT = cast<PointerType>(DstTy); 222a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const PointerType *SrcPT = cast<PointerType>(SrcTy); 223eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 2249ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner if (DstPT->getAddressSpace() != SrcPT->getAddressSpace()) 2259ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner return true; 226eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 227e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // If this is a pointer type, check to see if we have already seen it. If 228e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // so, we are in a recursive branch. Cut off the search now. We cannot use 229e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // an associative container for this search, because the type pointers (keys 23062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner // in the container) change whenever types get resolved. 23162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (SrcPT->isAbstract()) 23262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (const Type *ExistingDestTy = Pointers.lookup(SrcPT)) 23362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return ExistingDestTy != DstPT; 234eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 23562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (DstPT->isAbstract()) 23662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (const Type *ExistingSrcTy = Pointers.lookup(DstPT)) 23762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return ExistingSrcTy != SrcPT; 238e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // Otherwise, add the current pointers to the vector to stop recursion on 239e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // this pair. 24062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (DstPT->isAbstract()) 24162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner Pointers.insert(DstPT, SrcPT); 24262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (SrcPT->isAbstract()) 24362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner Pointers.insert(SrcPT, DstPT); 244eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 2459ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner return RecursiveResolveTypesI(DstPT->getElementType(), 2469ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner SrcPT->getElementType(), Pointers); 247e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 248f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman } 249e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner} 250e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 251a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattnerstatic bool RecursiveResolveTypes(const Type *DestTy, const Type *SrcTy) { 25262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner LinkerTypeMap PointerTypes; 253bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner return RecursiveResolveTypesI(DestTy, SrcTy, PointerTypes); 254e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner} 255e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner 256e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 2572c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// LinkTypes - Go through the symbol table of the Src module and see if any 2582c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// types are named in the src module that are not named in the Dst module. 2592c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// Make sure there are no type name conflicts. 2605c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic bool LinkTypes(Module *Dest, const Module *Src, std::string *Err) { 26178d033e086e19e016273de014f9214aa6f3f844bReid Spencer TypeSymbolTable *DestST = &Dest->getTypeSymbolTable(); 26278d033e086e19e016273de014f9214aa6f3f844bReid Spencer const TypeSymbolTable *SrcST = &Src->getTypeSymbolTable(); 2632c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 2642c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Look for a type plane for Type's... 26578d033e086e19e016273de014f9214aa6f3f844bReid Spencer TypeSymbolTable::const_iterator TI = SrcST->begin(); 26678d033e086e19e016273de014f9214aa6f3f844bReid Spencer TypeSymbolTable::const_iterator TE = SrcST->end(); 267567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer if (TI == TE) return false; // No named types, do nothing. 2682c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 269cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // Some types cannot be resolved immediately because they depend on other 270cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // types being resolved to each other first. This contains a list of types we 271cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // are waiting to recheck. 2724c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner std::vector<std::string> DelayedTypesToResolve; 2734c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 274567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer for ( ; TI != TE; ++TI ) { 275567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer const std::string &Name = TI->first; 276c28a224c68adf0464c275778af4bce762ad25d37Reid Spencer const Type *RHS = TI->second; 2772c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 278bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner // Check to see if this type name is already in the dest module. 27978d033e086e19e016273de014f9214aa6f3f844bReid Spencer Type *Entry = DestST->lookup(Name); 2804c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 281bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner // If the name is just in the source module, bring it over to the dest. 282bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner if (Entry == 0) { 283bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner if (!Name.empty()) 284bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner DestST->insert(Name, const_cast<Type*>(RHS)); 285bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner } else if (ResolveTypes(Entry, RHS)) { 2864c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // They look different, save the types 'till later to resolve. 2874c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner DelayedTypesToResolve.push_back(Name); 2884c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 2894c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 2904c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 2914c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Iteratively resolve types while we can... 2924c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner while (!DelayedTypesToResolve.empty()) { 2934c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Loop over all of the types, attempting to resolve them if possible... 2944c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner unsigned OldSize = DelayedTypesToResolve.size(); 2954c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 296e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Try direct resolution by name... 2974c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner for (unsigned i = 0; i != DelayedTypesToResolve.size(); ++i) { 2984c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner const std::string &Name = DelayedTypesToResolve[i]; 29978d033e086e19e016273de014f9214aa6f3f844bReid Spencer Type *T1 = SrcST->lookup(Name); 30078d033e086e19e016273de014f9214aa6f3f844bReid Spencer Type *T2 = DestST->lookup(Name); 301bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner if (!ResolveTypes(T2, T1)) { 3024c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // We are making progress! 3034c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i); 3044c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner --i; 3052f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner } 3064c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 3072f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner 3084c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Did we not eliminate any types? 3094c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (DelayedTypesToResolve.size() == OldSize) { 310e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Attempt to resolve subelements of types. This allows us to merge these 311e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // two types: { int* } and { opaque* } 3124c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner for (unsigned i = 0, e = DelayedTypesToResolve.size(); i != e; ++i) { 3134c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner const std::string &Name = DelayedTypesToResolve[i]; 314a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (!RecursiveResolveTypes(SrcST->lookup(Name), DestST->lookup(Name))) { 315e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // We are making progress! 316e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i); 317f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 318e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Go back to the main loop, perhaps we can resolve directly by name 319e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // now... 320e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner break; 321e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 322e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 323e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 324e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // If we STILL cannot resolve the types, then there is something wrong. 325e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DelayedTypesToResolve.size() == OldSize) { 326aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner // Remove the symbol name from the destination. 327aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner DelayedTypesToResolve.pop_back(); 3284c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 3292c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner } 3302c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner } 3314c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 3324c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 3332c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner return false; 3342c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner} 3352c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 3360bb8757997392ee18ca9de0f1fab29463f8e7aebChris Lattner#ifndef NDEBUG 3375c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic void PrintMap(const std::map<const Value*, Value*> &M) { 3385c2d335d86579941b71816196a95a64b277e8963Chris Lattner for (std::map<const Value*, Value*>::const_iterator I = M.begin(), E =M.end(); 3392d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner I != E; ++I) { 340bdff548e4dd577a72094d57b282de4e765643b96Chris Lattner errs() << " Fr: " << (void*)I->first << " "; 34187182ae6baf28ca6da6ee4bc00cf1857f293acfeChris Lattner I->first->dump(); 342bdff548e4dd577a72094d57b282de4e765643b96Chris Lattner errs() << " To: " << (void*)I->second << " "; 34387182ae6baf28ca6da6ee4bc00cf1857f293acfeChris Lattner I->second->dump(); 344bdff548e4dd577a72094d57b282de4e765643b96Chris Lattner errs() << "\n"; 3452d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner } 3462d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner} 3470bb8757997392ee18ca9de0f1fab29463f8e7aebChris Lattner#endif 3482d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 3492d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 350619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer// RemapOperand - Use ValueMap to convert constants from one module to another. 3515c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic Value *RemapOperand(const Value *In, 352c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson std::map<const Value*, Value*> &ValueMap, 353c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson LLVMContext &Context) { 3540033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner std::map<const Value*,Value*>::const_iterator I = ValueMap.find(In); 355eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov if (I != ValueMap.end()) 356ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer return I->second; 3575c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 358619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer // Check to see if it's a constant that we are interested in transforming. 359620fd68b1086b4d99b23951357299bee357aa62aChris Lattner Value *Result = 0; 36018961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (const Constant *CPV = dyn_cast<Constant>(In)) { 361de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if ((!isa<DerivedType>(CPV->getType()) && !isa<ConstantExpr>(CPV)) || 362a54b7cbd452b3adb2f51346140d996b29c2cdb30Reid Spencer isa<ConstantInt>(CPV) || isa<ConstantAggregateZero>(CPV)) 3630033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner return const_cast<Constant*>(CPV); // Simple constants stay identical. 3648d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 36518961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (const ConstantArray *CPA = dyn_cast<ConstantArray>(CPV)) { 366cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos std::vector<Constant*> Operands(CPA->getNumOperands()); 367cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i) 368c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson Operands[i] =cast<Constant>(RemapOperand(CPA->getOperand(i), ValueMap, 369c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson Context)); 370c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson Result = 3711fd7096407d5e598ed3366a1141548e71273f1c5Owen Anderson ConstantArray::get(cast<ArrayType>(CPA->getType()), Operands); 37218961504fc2b299578dba817900a0696cf3ccc4dChris Lattner } else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(CPV)) { 373cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos std::vector<Constant*> Operands(CPS->getNumOperands()); 374cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i) 375c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson Operands[i] =cast<Constant>(RemapOperand(CPS->getOperand(i), ValueMap, 376c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson Context)); 377c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson Result = 3788fa3338ed2400c1352b137613d2c2c70d1ead695Owen Anderson ConstantStruct::get(cast<StructType>(CPS->getType()), Operands); 379b976e668165e1875a8f1eb7af800e33bb1e4393dChris Lattner } else if (isa<ConstantPointerNull>(CPV) || isa<UndefValue>(CPV)) { 38018961504fc2b299578dba817900a0696cf3ccc4dChris Lattner Result = const_cast<Constant*>(CPV); 3819d6565a5b1fbc4286d6ee638d8f47a3171a9ed7eReid Spencer } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CPV)) { 382a88eb9287eb14ba62ca6324b2b249e0ae9fe3309Chris Lattner std::vector<Constant*> Operands(CP->getNumOperands()); 383a88eb9287eb14ba62ca6324b2b249e0ae9fe3309Chris Lattner for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i) 384c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson Operands[i] = cast<Constant>(RemapOperand(CP->getOperand(i), ValueMap, 385c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson Context)); 386af7ec975870f92245f1f1484ac80a1e2db6a0afaOwen Anderson Result = ConstantVector::get(Operands); 3876cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) { 38827d672136a57519095a3ef20161697749cffb57cChris Lattner std::vector<Constant*> Ops; 38927d672136a57519095a3ef20161697749cffb57cChris Lattner for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) 390c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson Ops.push_back(cast<Constant>(RemapOperand(CE->getOperand(i),ValueMap, 391c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson Context))); 39227d672136a57519095a3ef20161697749cffb57cChris Lattner Result = CE->getWithOperands(Ops); 3938d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } else { 3940bb8757997392ee18ca9de0f1fab29463f8e7aebChris Lattner assert(!isa<GlobalValue>(CPV) && "Unmapped global?"); 395c23197a26f34f559ea9797de51e187087c039c42Torok Edwin llvm_unreachable("Unknown type of derived type constant value!"); 3968d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 397ae709eaeb12e4a293e812c61514a9ebd9e24fe14Devang Patel } else if (const MDNode *N = dyn_cast<MDNode>(In)) { 398ae709eaeb12e4a293e812c61514a9ebd9e24fe14Devang Patel std::vector<Value*> Elems; 399ae709eaeb12e4a293e812c61514a9ebd9e24fe14Devang Patel for (unsigned i = 0, e = N->getNumElements(); i !=e; ++i) 400ae709eaeb12e4a293e812c61514a9ebd9e24fe14Devang Patel Elems.push_back(RemapOperand(N->getElement(i), ValueMap, Context)); 401ae709eaeb12e4a293e812c61514a9ebd9e24fe14Devang Patel if (!Elems.empty()) 402ae709eaeb12e4a293e812c61514a9ebd9e24fe14Devang Patel Result = MDNode::get(Context, &Elems[0], Elems.size()); 403ae709eaeb12e4a293e812c61514a9ebd9e24fe14Devang Patel } else if (const MDString *MDS = dyn_cast<MDString>(In)) { 404ae709eaeb12e4a293e812c61514a9ebd9e24fe14Devang Patel Result = MDString::get(Context, MDS->getString()); 405620fd68b1086b4d99b23951357299bee357aa62aChris Lattner } else if (isa<InlineAsm>(In)) { 406620fd68b1086b4d99b23951357299bee357aa62aChris Lattner Result = const_cast<Value*>(In); 407620fd68b1086b4d99b23951357299bee357aa62aChris Lattner } 408eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 409619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer // Cache the mapping in our local map structure 410620fd68b1086b4d99b23951357299bee357aa62aChris Lattner if (Result) { 411817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[In] = Result; 4128d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return Result; 4138d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 414eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 4150bb8757997392ee18ca9de0f1fab29463f8e7aebChris Lattner#ifndef NDEBUG 416bdff548e4dd577a72094d57b282de4e765643b96Chris Lattner errs() << "LinkModules ValueMap: \n"; 4170033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner PrintMap(ValueMap); 4182d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 419bdff548e4dd577a72094d57b282de4e765643b96Chris Lattner errs() << "Couldn't remap value: " << (void*)In << " " << *In << "\n"; 420c23197a26f34f559ea9797de51e187087c039c42Torok Edwin llvm_unreachable("Couldn't remap value!"); 4210bb8757997392ee18ca9de0f1fab29463f8e7aebChris Lattner#endif 4228d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return 0; 4235c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 4245c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4258bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer/// ForceRenaming - The LLVM SymbolTable class autorenames globals that conflict 4268bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer/// in the symbol table. This is good for all clients except for us. Go 4278bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer/// through the trouble to force this back. 428c003628a612d3687fb77088a5894314210a65385Chris Lattnerstatic void ForceRenaming(GlobalValue *GV, const std::string &Name) { 429c003628a612d3687fb77088a5894314210a65385Chris Lattner assert(GV->getName() != Name && "Can't force rename to self"); 430ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ValueSymbolTable &ST = GV->getParent()->getValueSymbolTable(); 431c003628a612d3687fb77088a5894314210a65385Chris Lattner 432c003628a612d3687fb77088a5894314210a65385Chris Lattner // If there is a conflict, rename the conflict. 43333f294930e0affa51c3818405741abd80cc90316Chris Lattner if (GlobalValue *ConflictGV = cast_or_null<GlobalValue>(ST.lookup(Name))) { 434bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola assert(ConflictGV->hasLocalLinkage() && 435ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer "Not conflicting with a static global, should link instead!"); 43633f294930e0affa51c3818405741abd80cc90316Chris Lattner GV->takeName(ConflictGV); 43733f294930e0affa51c3818405741abd80cc90316Chris Lattner ConflictGV->setName(Name); // This will cause ConflictGV to get renamed 438ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer assert(ConflictGV->getName() != Name && "ForceRenaming didn't work"); 43933f294930e0affa51c3818405741abd80cc90316Chris Lattner } else { 44033f294930e0affa51c3818405741abd80cc90316Chris Lattner GV->setName(Name); // Force the name back 441ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer } 442ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer} 443ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer 444ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer/// CopyGVAttributes - copy additional attributes (those not needed to construct 445eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov/// a GlobalValue) from the SrcGV to the DestGV. 446ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencerstatic void CopyGVAttributes(GlobalValue *DestGV, const GlobalValue *SrcGV) { 44728c3cff8250b3fe2adc6479306fe7dbdb48a1bdbDuncan Sands // Use the maximum alignment, rather than just copying the alignment of SrcGV. 44828c3cff8250b3fe2adc6479306fe7dbdb48a1bdbDuncan Sands unsigned Alignment = std::max(DestGV->getAlignment(), SrcGV->getAlignment()); 44928c3cff8250b3fe2adc6479306fe7dbdb48a1bdbDuncan Sands DestGV->copyAttributesFrom(SrcGV); 45028c3cff8250b3fe2adc6479306fe7dbdb48a1bdbDuncan Sands DestGV->setAlignment(Alignment); 451c003628a612d3687fb77088a5894314210a65385Chris Lattner} 452c003628a612d3687fb77088a5894314210a65385Chris Lattner 453aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// GetLinkageResult - This analyzes the two global values and determines what 454aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// the result will look like in the destination module. In particular, it 455aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// computes the resultant linkage type, computes whether the global in the 456aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// source should be copied over to the destination (replacing the existing 4579cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov/// one), and computes whether this linkage is an error or not. It also performs 4589cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov/// visibility checks: we cannot link together two symbols with different 4599cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov/// visibilities. 460968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikovstatic bool GetLinkageResult(GlobalValue *Dest, const GlobalValue *Src, 461aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner GlobalValue::LinkageTypes <, bool &LinkFromSrc, 462aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner std::string *Err) { 463bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola assert((!Dest || !Src->hasLocalLinkage()) && 464aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "If Src has internal linkage, Dest shouldn't be set!"); 465aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (!Dest) { 466aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // Linking something to nothing. 467aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 468aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 4695cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer } else if (Src->isDeclaration()) { 4702b48ef0450944c2c46633aec9baf6be835a3b503Anton Korobeynikov // If Src is external or if both Src & Dest are external.. Just link the 471aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // external globals, we aren't adding anything. 472b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov if (Src->hasDLLImportLinkage()) { 47378ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // If one of GVs has DLLImport linkage, result should be dllimport'ed. 4745cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer if (Dest->isDeclaration()) { 475b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LinkFromSrc = true; 476b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LT = Src->getLinkage(); 477eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov } 4788753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth } else if (Dest->hasExternalWeakLinkage()) { 479667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands // If the Dest is weak, use the source linkage. 4808753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth LinkFromSrc = true; 4818753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth LT = Src->getLinkage(); 482b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } else { 483b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LinkFromSrc = false; 484b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LT = Dest->getLinkage(); 485b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } 4865cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer } else if (Dest->isDeclaration() && !Dest->hasDLLImportLinkage()) { 487aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // If Dest is external but Src is not: 488aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 489aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 490aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else if (Src->hasAppendingLinkage() || Dest->hasAppendingLinkage()) { 491aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (Src->getLinkage() != Dest->getLinkage()) 492aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner return Error(Err, "Linking globals named '" + Src->getName() + 493aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "': can only link appending global with another appending global!"); 494aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; // Special cased. 495aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 496a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands } else if (Src->isWeakForLinker()) { 497aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen // At this point we know that Dest has LinkOnce, External*, Weak, Common, 498aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen // or DLL* linkage. 499266c7bbbbcc4b326dea82e577de1a415d6acc23eChris Lattner if (Dest->hasExternalWeakLinkage() || 500266c7bbbbcc4b326dea82e577de1a415d6acc23eChris Lattner Dest->hasAvailableExternallyLinkage() || 501266c7bbbbcc4b326dea82e577de1a415d6acc23eChris Lattner (Dest->hasLinkOnceLinkage() && 502266c7bbbbcc4b326dea82e577de1a415d6acc23eChris Lattner (Src->hasWeakLinkage() || Src->hasCommonLinkage()))) { 503aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 504aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 505aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else { 506aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = false; 507aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Dest->getLinkage(); 508aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 509a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands } else if (Dest->isWeakForLinker()) { 51078ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // At this point we know that Src has External* or DLL* linkage. 51178ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov if (Src->hasExternalWeakLinkage()) { 51278ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LinkFromSrc = false; 51378ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LT = Dest->getLinkage(); 51478ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov } else { 51578ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LinkFromSrc = true; 51678ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LT = GlobalValue::ExternalLinkage; 51778ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov } 518aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else { 519b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov assert((Dest->hasExternalLinkage() || 520b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov Dest->hasDLLImportLinkage() || 52178ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Dest->hasDLLExportLinkage() || 52278ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Dest->hasExternalWeakLinkage()) && 523b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov (Src->hasExternalLinkage() || 524b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov Src->hasDLLImportLinkage() || 52578ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Src->hasDLLExportLinkage() || 52678ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Src->hasExternalWeakLinkage()) && 527aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "Unexpected linkage type!"); 528f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman return Error(Err, "Linking globals named '" + Src->getName() + 529aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "': symbol multiply defined!"); 530aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 5319cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov 5329cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov // Check visibility 5339cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov if (Dest && Src->getVisibility() != Dest->getVisibility()) 53497f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner if (!Src->isDeclaration() && !Dest->isDeclaration()) 53597f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner return Error(Err, "Linking globals named '" + Src->getName() + 53697f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner "': symbols have different visibilities!"); 537aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner return false; 538aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner} 5395c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 540ab67e705f59d567afded845465f358b8a66ab62eDevang Patel// Insert all of the named mdnoes in Src into the Dest module. 541ab67e705f59d567afded845465f358b8a66ab62eDevang Patelstatic void LinkNamedMDNodes(Module *Dest, Module *Src) { 542ab67e705f59d567afded845465f358b8a66ab62eDevang Patel for (Module::const_named_metadata_iterator I = Src->named_metadata_begin(), 543ab67e705f59d567afded845465f358b8a66ab62eDevang Patel E = Src->named_metadata_end(); I != E; ++I) { 544ab67e705f59d567afded845465f358b8a66ab62eDevang Patel const NamedMDNode *SrcNMD = I; 545ab67e705f59d567afded845465f358b8a66ab62eDevang Patel NamedMDNode *DestNMD = Dest->getNamedMetadata(SrcNMD->getName()); 546ab67e705f59d567afded845465f358b8a66ab62eDevang Patel if (!DestNMD) 547ab67e705f59d567afded845465f358b8a66ab62eDevang Patel NamedMDNode::Create(SrcNMD, Dest); 548ab67e705f59d567afded845465f358b8a66ab62eDevang Patel else { 549ab67e705f59d567afded845465f358b8a66ab62eDevang Patel // Add Src elements into Dest node. 550ab67e705f59d567afded845465f358b8a66ab62eDevang Patel for (unsigned i = 0, e = SrcNMD->getNumElements(); i != e; ++i) 551ab67e705f59d567afded845465f358b8a66ab62eDevang Patel DestNMD->addElement(SrcNMD->getElement(i)); 552ab67e705f59d567afded845465f358b8a66ab62eDevang Patel } 553ab67e705f59d567afded845465f358b8a66ab62eDevang Patel } 554ab67e705f59d567afded845465f358b8a66ab62eDevang Patel} 555ab67e705f59d567afded845465f358b8a66ab62eDevang Patel 5565c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// LinkGlobals - Loop through the global variables in the src module and merge 5578166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// them into the dest module. 558968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikovstatic bool LinkGlobals(Module *Dest, const Module *Src, 5595c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 5608166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 5615c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 562d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner ValueSymbolTable &DestSymTab = Dest->getValueSymbolTable(); 563eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 5645c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 5650bb8757997392ee18ca9de0f1fab29463f8e7aebChris Lattner for (Module::const_global_iterator I = Src->global_begin(), 5660bb8757997392ee18ca9de0f1fab29463f8e7aebChris Lattner E = Src->global_end(); I != E; ++I) { 567968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov const GlobalVariable *SGV = I; 56801f69399352380532d480f6749daed660f50b15cAnton Korobeynikov GlobalValue *DGV = 0; 56901f69399352380532d480f6749daed660f50b15cAnton Korobeynikov 570d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // Check to see if may have to link the global with the global, alias or 571d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // function. 572bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (SGV->hasName() && !SGV->hasLocalLinkage()) 57303d7651c3652e1f0cc86e79b26585d86818da9cfDaniel Dunbar DGV = cast_or_null<GlobalValue>(DestSymTab.lookup(SGV->getName())); 574eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 575ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner // If we found a global with the same name in the dest module, but it has 576ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner // internal linkage, we are really not doing any linkage here. 577bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (DGV && DGV->hasLocalLinkage()) 578ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner DGV = 0; 579eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 580d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // If types don't agree due to opaque types, try to resolve them. 581d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner if (DGV && DGV->getType() != SGV->getType()) 582d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner RecursiveResolveTypes(SGV->getType(), DGV->getType()); 58301f69399352380532d480f6749daed660f50b15cAnton Korobeynikov 584c318329a1098a19137398af4d880f4d8cdd9cd8dDan Gohman assert((SGV->hasInitializer() || SGV->hasExternalWeakLinkage() || 585c318329a1098a19137398af4d880f4d8cdd9cd8dDan Gohman SGV->hasExternalLinkage() || SGV->hasDLLImportLinkage()) && 5864ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner "Global must either be external or have an initializer!"); 5875c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 588b324bd735ff5c99a52cd3c3f5d01c0e1398a2d3aChris Lattner GlobalValue::LinkageTypes NewLinkage = GlobalValue::InternalLinkage; 589b324bd735ff5c99a52cd3c3f5d01c0e1398a2d3aChris Lattner bool LinkFromSrc = false; 590aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (GetLinkageResult(DGV, SGV, NewLinkage, LinkFromSrc, Err)) 591aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner return true; 5920fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner 5936157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (DGV == 0) { 5945c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // No linking to be performed, simply create an identical version of the 5958d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // symbol over in the dest module... the initializer will be filled in 596d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // later by LinkGlobalInits. 5972719bac90525985f4ebb97324b4c087d47b54384Chris Lattner GlobalVariable *NewDGV = 598e9b11b431308f4766b73cda93e38ec930c912122Owen Anderson new GlobalVariable(*Dest, SGV->getType()->getElementType(), 5992719bac90525985f4ebb97324b4c087d47b54384Chris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 600e9b11b431308f4766b73cda93e38ec930c912122Owen Anderson SGV->getName(), 0, false, 601a534b0f7bf0248bf90afe97110a34777e972f325Chris Lattner SGV->getType()->getAddressSpace()); 602471feac1b297b9458de18d973af371bf7f10296bReid Spencer // Propagate alignment, visibility and section info. 603ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer CopyGVAttributes(NewDGV, SGV); 6045dfbaf1fe3fa6914095cc55cde20b1ed25187b56Andrew Lenharth 6052719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // If the LLVM runtime renamed the global, but it is an externally visible 6062719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // symbol, DGV must be an existing global with internal linkage. Rename 6072719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // it. 608bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (!NewDGV->hasLocalLinkage() && NewDGV->getName() != SGV->getName()) 609c003628a612d3687fb77088a5894314210a65385Chris Lattner ForceRenaming(NewDGV, SGV->getName()); 6105c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 6116157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Make sure to remember this mapping. 612817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[SGV] = NewDGV; 613817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov 614d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // Keep track that this is an appending variable. 6158166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (SGV->hasAppendingLinkage()) 6168166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV)); 6176157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner continue; 6186157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner } 619eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 6206157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // If the visibilities of the symbols disagree and the destination is a 6216157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // prototype, take the visibility of its input. 6226157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (DGV->isDeclaration()) 6236157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner DGV->setVisibility(SGV->getVisibility()); 624eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 6256157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (DGV->hasAppendingLinkage()) { 6268166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // No linking is performed yet. Just insert a new copy of the global, and 6278166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // keep track of the fact that it is an appending variable in the 6288166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars map. The name is cleared out so that no linkage is 6298166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // performed. 6308166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NewDGV = 631e9b11b431308f4766b73cda93e38ec930c912122Owen Anderson new GlobalVariable(*Dest, SGV->getType()->getElementType(), 6328166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 633e9b11b431308f4766b73cda93e38ec930c912122Owen Anderson "", 0, false, 634a534b0f7bf0248bf90afe97110a34777e972f325Chris Lattner SGV->getType()->getAddressSpace()); 6358166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 63675c7915c3a24f8063c274ccffe2dc9b7bc8bce1fAnton Korobeynikov // Set alignment allowing CopyGVAttributes merge it with alignment of SGV. 637ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer NewDGV->setAlignment(DGV->getAlignment()); 63875c7915c3a24f8063c274ccffe2dc9b7bc8bce1fAnton Korobeynikov // Propagate alignment, section and visibility info. 639ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer CopyGVAttributes(NewDGV, SGV); 6405dfbaf1fe3fa6914095cc55cde20b1ed25187b56Andrew Lenharth 6418166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Make sure to remember this mapping... 642817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[SGV] = NewDGV; 6438166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 6448166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Keep track that this is an appending variable... 6458166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV)); 6466157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner continue; 6476157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner } 648eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 6496157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (LinkFromSrc) { 6506157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (isa<GlobalAlias>(DGV)) 6511438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Global-Alias Collision on '" + SGV->getName() + 6521438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': symbol multiple defined"); 653eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 654d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // If the types don't match, and if we are to link from the source, nuke 655d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // DGV and create a new one of the appropriate type. Note that the thing 656d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // we are replacing may be a function (if a prototype, weak, etc) or a 657d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // global variable. 658d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner GlobalVariable *NewDGV = 659e9b11b431308f4766b73cda93e38ec930c912122Owen Anderson new GlobalVariable(*Dest, SGV->getType()->getElementType(), 6603d29df3e8a203b167d8071ea6f805b21db18a5afOwen Anderson SGV->isConstant(), NewLinkage, /*init*/0, 661e9b11b431308f4766b73cda93e38ec930c912122Owen Anderson DGV->getName(), 0, false, 662d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner SGV->getType()->getAddressSpace()); 663eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 664d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // Propagate alignment, section, and visibility info. 665d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner CopyGVAttributes(NewDGV, SGV); 666baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson DGV->replaceAllUsesWith(ConstantExpr::getBitCast(NewDGV, 667c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson DGV->getType())); 668eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 669d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // DGV will conflict with NewDGV because they both had the same 670d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // name. We must erase this now so ForceRenaming doesn't assert 671d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // because DGV might not have internal linkage. 672d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner if (GlobalVariable *Var = dyn_cast<GlobalVariable>(DGV)) 673d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner Var->eraseFromParent(); 674d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner else 675d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner cast<Function>(DGV)->eraseFromParent(); 676d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner DGV = NewDGV; 677d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner 678d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // If the symbol table renamed the global, but it is an externally visible 679d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // symbol, DGV must be an existing global with internal linkage. Rename. 680bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (NewDGV->getName() != SGV->getName() && !NewDGV->hasLocalLinkage()) 681d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner ForceRenaming(NewDGV, SGV->getName()); 682eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 6836157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Inherit const as appropriate. 684d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner NewDGV->setConstant(SGV->isConstant()); 685eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 6866157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Make sure to remember this mapping. 6876157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner ValueMap[SGV] = NewDGV; 6886157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner continue; 6895c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 690eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 6916157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Not "link from source", keep the one in the DestModule and remap the 6926157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // input onto it. 693eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 6946157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Special case for const propagation. 6956157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (GlobalVariable *DGVar = dyn_cast<GlobalVariable>(DGV)) 6966157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (DGVar->isDeclaration() && SGV->isConstant() && !DGVar->isConstant()) 6976157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner DGVar->setConstant(true); 6986157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 699d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // SGV is global, but DGV is alias. 700d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov if (isa<GlobalAlias>(DGV)) { 701d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // The only valid mappings are: 702d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // - SGV is external declaration, which is effectively a no-op. 703d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // - SGV is weak, when we just need to throw SGV out. 704a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands if (!SGV->isDeclaration() && !SGV->isWeakForLinker()) 705d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov return Error(Err, "Global-Alias Collision on '" + SGV->getName() + 706d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov "': symbol multiple defined"); 707d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov } 708eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 7096157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Set calculated linkage 7106157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner DGV->setLinkage(NewLinkage); 711eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 7126157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Make sure to remember this mapping... 713baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson ValueMap[SGV] = ConstantExpr::getBitCast(DGV, SGV->getType()); 7145c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 7155c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 7165c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 7175c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 71858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikovstatic GlobalValue::LinkageTypes 71958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton KorobeynikovCalculateAliasLinkage(const GlobalValue *SGV, const GlobalValue *DGV) { 720667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands GlobalValue::LinkageTypes SL = SGV->getLinkage(); 721667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands GlobalValue::LinkageTypes DL = DGV->getLinkage(); 722667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands if (SL == GlobalValue::ExternalLinkage || DL == GlobalValue::ExternalLinkage) 72358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov return GlobalValue::ExternalLinkage; 724667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands else if (SL == GlobalValue::WeakAnyLinkage || 725667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands DL == GlobalValue::WeakAnyLinkage) 726667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands return GlobalValue::WeakAnyLinkage; 727667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands else if (SL == GlobalValue::WeakODRLinkage || 728667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands DL == GlobalValue::WeakODRLinkage) 729667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands return GlobalValue::WeakODRLinkage; 730667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands else if (SL == GlobalValue::InternalLinkage && 731667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands DL == GlobalValue::InternalLinkage) 73258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov return GlobalValue::InternalLinkage; 7333d10a5a75794356a0a568ce283713adc3a963200Bill Wendling else if (SL == GlobalValue::LinkerPrivateLinkage && 7343d10a5a75794356a0a568ce283713adc3a963200Bill Wendling DL == GlobalValue::LinkerPrivateLinkage) 7353d10a5a75794356a0a568ce283713adc3a963200Bill Wendling return GlobalValue::LinkerPrivateLinkage; 736bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola else { 737667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands assert (SL == GlobalValue::PrivateLinkage && 738667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands DL == GlobalValue::PrivateLinkage && "Unexpected linkage type"); 739bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola return GlobalValue::PrivateLinkage; 74058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } 74158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov} 74258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 74331ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio// LinkAlias - Loop through the alias in the src module and link them into the 74458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov// dest module. We're assuming, that all functions/global variables were already 74558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov// linked in. 7464fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikovstatic bool LinkAlias(Module *Dest, const Module *Src, 7474fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov std::map<const Value*, Value*> &ValueMap, 7484fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov std::string *Err) { 74931ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio // Loop over all alias in the src module 75031ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio for (Module::const_alias_iterator I = Src->alias_begin(), 75131ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio E = Src->alias_end(); I != E; ++I) { 75258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov const GlobalAlias *SGA = I; 75358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov const GlobalValue *SAliasee = SGA->getAliasedGlobal(); 75458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov GlobalAlias *NewGA = NULL; 75558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 75658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Globals were already linked, thus we can just query ValueMap for variant 757caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // of SAliasee in Dest. 75858d5e051574339106ce4139697ebadd21e34dbc0Ted Kremenek std::map<const Value*,Value*>::const_iterator VMI = ValueMap.find(SAliasee); 75958d5e051574339106ce4139697ebadd21e34dbc0Ted Kremenek assert(VMI != ValueMap.end() && "Aliasee not linked"); 76058d5e051574339106ce4139697ebadd21e34dbc0Ted Kremenek GlobalValue* DAliasee = cast<GlobalValue>(VMI->second); 761caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov GlobalValue* DGV = NULL; 76258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 76358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Try to find something 'similar' to SGA in destination module. 764bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (!DGV && !SGA->hasLocalLinkage()) { 765caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGV = Dest->getNamedAlias(SGA->getName()); 766caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 767caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // If types don't agree due to opaque types, try to resolve them. 768caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (DGV && DGV->getType() != SGA->getType()) 7695ed2ba26680f06846e7602ce65432b0a723b1273Chris Lattner RecursiveResolveTypes(SGA->getType(), DGV->getType()); 770caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } 771caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 772bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (!DGV && !SGA->hasLocalLinkage()) { 773caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGV = Dest->getGlobalVariable(SGA->getName()); 774caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 77558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // If types don't agree due to opaque types, try to resolve them. 776caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (DGV && DGV->getType() != SGA->getType()) 7775ed2ba26680f06846e7602ce65432b0a723b1273Chris Lattner RecursiveResolveTypes(SGA->getType(), DGV->getType()); 778caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } 77958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 780bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (!DGV && !SGA->hasLocalLinkage()) { 781caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGV = Dest->getFunction(SGA->getName()); 782caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 783caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // If types don't agree due to opaque types, try to resolve them. 784caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (DGV && DGV->getType() != SGA->getType()) 7855ed2ba26680f06846e7602ce65432b0a723b1273Chris Lattner RecursiveResolveTypes(SGA->getType(), DGV->getType()); 786caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } 787caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 788caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // No linking to be performed on internal stuff. 789bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (DGV && DGV->hasLocalLinkage()) 790caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGV = NULL; 791caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 792caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (GlobalAlias *DGA = dyn_cast_or_null<GlobalAlias>(DGV)) { 793caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // Types are known to be the same, check whether aliasees equal. As 79458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // globals are already linked we just need query ValueMap to find the 79558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // mapping. 79658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov if (DAliasee == DGA->getAliasedGlobal()) { 79758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // This is just two copies of the same alias. Propagate linkage, if 79858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // necessary. 79958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov DGA->setLinkage(CalculateAliasLinkage(SGA, DGA)); 80058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 80158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov NewGA = DGA; 80258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Proceed to 'common' steps 80358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } else 8041438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Alias Collision on '" + SGA->getName()+ 8051438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': aliases have different aliasees"); 806caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } else if (GlobalVariable *DGVar = dyn_cast_or_null<GlobalVariable>(DGV)) { 807f88bc65932e5cf41ba6ca706cd1b1b1f65300248Anton Korobeynikov // The only allowed way is to link alias with external declaration or weak 808f88bc65932e5cf41ba6ca706cd1b1b1f65300248Anton Korobeynikov // symbol.. 809a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands if (DGVar->isDeclaration() || DGVar->isWeakForLinker()) { 810ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov // But only if aliasee is global too... 811ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov if (!isa<GlobalVariable>(DAliasee)) 812caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov return Error(Err, "Global-Alias Collision on '" + SGA->getName() + 813caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov "': aliasee is not global variable"); 814ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov 81558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov NewGA = new GlobalAlias(SGA->getType(), SGA->getLinkage(), 81658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov SGA->getName(), DAliasee, Dest); 81758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov CopyGVAttributes(NewGA, SGA); 81858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 81958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Any uses of DGV need to change to NewGA, with cast, if needed. 820caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (SGA->getType() != DGVar->getType()) 821baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson DGVar->replaceAllUsesWith(ConstantExpr::getBitCast(NewGA, 822caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGVar->getType())); 82358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov else 824caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGVar->replaceAllUsesWith(NewGA); 82558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 826caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // DGVar will conflict with NewGA because they both had the same 82758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // name. We must erase this now so ForceRenaming doesn't assert 82858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // because DGV might not have internal linkage. 829caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGVar->eraseFromParent(); 83058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 83158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Proceed to 'common' steps 83258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } else 8331438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Global-Alias Collision on '" + SGA->getName() + 8341438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': symbol multiple defined"); 835caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } else if (Function *DF = dyn_cast_or_null<Function>(DGV)) { 836f88bc65932e5cf41ba6ca706cd1b1b1f65300248Anton Korobeynikov // The only allowed way is to link alias with external declaration or weak 837f88bc65932e5cf41ba6ca706cd1b1b1f65300248Anton Korobeynikov // symbol... 838a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands if (DF->isDeclaration() || DF->isWeakForLinker()) { 839ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov // But only if aliasee is function too... 840ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov if (!isa<Function>(DAliasee)) 841caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov return Error(Err, "Function-Alias Collision on '" + SGA->getName() + 842caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov "': aliasee is not function"); 843ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov 844b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov NewGA = new GlobalAlias(SGA->getType(), SGA->getLinkage(), 845b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov SGA->getName(), DAliasee, Dest); 846b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov CopyGVAttributes(NewGA, SGA); 847b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov 848b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // Any uses of DF need to change to NewGA, with cast, if needed. 849b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov if (SGA->getType() != DF->getType()) 850baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson DF->replaceAllUsesWith(ConstantExpr::getBitCast(NewGA, 851b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov DF->getType())); 852b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov else 853b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov DF->replaceAllUsesWith(NewGA); 854b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov 855b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // DF will conflict with NewGA because they both had the same 856b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // name. We must erase this now so ForceRenaming doesn't assert 857b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // because DF might not have internal linkage. 858b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov DF->eraseFromParent(); 859b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov 860b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // Proceed to 'common' steps 861b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov } else 8621438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Function-Alias Collision on '" + SGA->getName() + 8631438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': symbol multiple defined"); 86458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } else { 865caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // No linking to be performed, simply create an identical version of the 866caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // alias over in the dest module... 86758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 86858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov NewGA = new GlobalAlias(SGA->getType(), SGA->getLinkage(), 86958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov SGA->getName(), DAliasee, Dest); 87058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov CopyGVAttributes(NewGA, SGA); 87158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 87258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Proceed to 'common' steps 87358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } 87458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 87558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov assert(NewGA && "No alias was created in destination module!"); 87658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 877b8cdaf7099898d7c0eef4769bf6a89f39e7decc2Anton Korobeynikov // If the symbol table renamed the alias, but it is an externally visible 878caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // symbol, DGA must be an global value with internal linkage. Rename it. 87958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov if (NewGA->getName() != SGA->getName() && 880bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola !NewGA->hasLocalLinkage()) 88158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov ForceRenaming(NewGA, SGA->getName()); 88258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 88358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Remember this mapping so uses in the source module get remapped 88458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // later by RemapOperand. 885817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[SGA] = NewGA; 88631ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio } 88758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 88831ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio return false; 88931ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio} 89031ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio 8915c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 8928d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// LinkGlobalInits - Update the initializers in the Dest module now that all 8938d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// globals that may be referenced are in Dest. 8948d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattnerstatic bool LinkGlobalInits(Module *Dest, const Module *Src, 8955c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 8965c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 8978d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 8981127315562b221010040925980040fd4f65bdb1cChris Lattner for (Module::const_global_iterator I = Src->global_begin(), 8991127315562b221010040925980040fd4f65bdb1cChris Lattner E = Src->global_end(); I != E; ++I) { 90018961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const GlobalVariable *SGV = I; 9018d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 9028d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner if (SGV->hasInitializer()) { // Only process initialized GV's 9038d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Figure out what the initializer looks like in the dest module... 9044ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner Constant *SInit = 905c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson cast<Constant>(RemapOperand(SGV->getInitializer(), ValueMap, 906c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson Dest->getContext())); 907d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // Grab destination global variable or alias. 908d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov GlobalValue *DGV = cast<GlobalValue>(ValueMap[SGV]->stripPointerCasts()); 909d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov 910d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // If dest if global variable, check that initializers match. 911d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov if (GlobalVariable *DGVar = dyn_cast<GlobalVariable>(DGV)) { 912d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov if (DGVar->hasInitializer()) { 913d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov if (SGV->hasExternalLinkage()) { 914d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov if (DGVar->getInitializer() != SInit) 915d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov return Error(Err, "Global Variable Collision on '" + 916d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov SGV->getName() + 917d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov "': global variables have different initializers"); 918a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands } else if (DGVar->isWeakForLinker()) { 919d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // Nothing is required, mapped values will take the new global 920d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // automatically. 921a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands } else if (SGV->isWeakForLinker()) { 922d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // Nothing is required, mapped values will take the new global 923d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // automatically. 924d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov } else if (DGVar->hasAppendingLinkage()) { 925c23197a26f34f559ea9797de51e187087c039c42Torok Edwin llvm_unreachable("Appending linkage unimplemented!"); 926d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov } else { 927c23197a26f34f559ea9797de51e187087c039c42Torok Edwin llvm_unreachable("Unknown linkage!"); 928d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov } 9294ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else { 930d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // Copy the initializer over now... 931d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov DGVar->setInitializer(SInit); 9324ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } 9338d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } else { 934d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // Destination is alias, the only valid situation is when source is 935d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // weak. Also, note, that we already checked linkage in LinkGlobals(), 936d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // thus we assert here. 937d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // FIXME: Should we weaken this assumption, 'dereference' alias and 938d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // check for initializer of aliasee? 939a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands assert(SGV->isWeakForLinker()); 9408d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 9418d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 9428d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 9438d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return false; 9448d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner} 9455c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 94679df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner// LinkFunctionProtos - Link the functions together between the two modules, 947c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// without doing function bodies... this just adds external function prototypes 948c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// to the Dest function... 9495c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 95079df7c0aaa18129e55968c8783ef8346807bd4afChris Lattnerstatic bool LinkFunctionProtos(Module *Dest, const Module *Src, 9515c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 9525c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 953d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner ValueSymbolTable &DestSymTab = Dest->getValueSymbolTable(); 954eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 955619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer // Loop over all of the functions in the src module, mapping them over 9565c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner for (Module::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) { 95718961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const Function *SF = I; // SrcFunction 958194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov GlobalValue *DGV = 0; 959eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 960d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // Check to see if may have to link the function with the global, alias or 961d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // function. 962bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (SF->hasName() && !SF->hasLocalLinkage()) 96303d7651c3652e1f0cc86e79b26585d86818da9cfDaniel Dunbar DGV = cast_or_null<GlobalValue>(DestSymTab.lookup(SF->getName())); 964eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 965ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner // If we found a global with the same name in the dest module, but it has 966ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner // internal linkage, we are really not doing any linkage here. 967bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (DGV && DGV->hasLocalLinkage()) 968ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner DGV = 0; 969ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner 970d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // If types don't agree due to opaque types, try to resolve them. 971d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner if (DGV && DGV->getType() != SF->getType()) 972d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner RecursiveResolveTypes(SF->getType(), DGV->getType()); 973194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov 9746157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner GlobalValue::LinkageTypes NewLinkage = GlobalValue::InternalLinkage; 9756157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner bool LinkFromSrc = false; 9766157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (GetLinkageResult(DGV, SF, NewLinkage, LinkFromSrc, Err)) 9776157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner return true; 978eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 979824684982968244050e56357e736b9940c23e77dChris Lattner // If there is no linkage to be performed, just bring over SF without 980824684982968244050e56357e736b9940c23e77dChris Lattner // modifying it. 981194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov if (DGV == 0) { 982824684982968244050e56357e736b9940c23e77dChris Lattner // Function does not already exist, simply insert an function signature 983824684982968244050e56357e736b9940c23e77dChris Lattner // identical to SF into the dest module. 984824684982968244050e56357e736b9940c23e77dChris Lattner Function *NewDF = Function::Create(SF->getFunctionType(), 985824684982968244050e56357e736b9940c23e77dChris Lattner SF->getLinkage(), 986824684982968244050e56357e736b9940c23e77dChris Lattner SF->getName(), Dest); 987824684982968244050e56357e736b9940c23e77dChris Lattner CopyGVAttributes(NewDF, SF); 988eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 989824684982968244050e56357e736b9940c23e77dChris Lattner // If the LLVM runtime renamed the function, but it is an externally 990824684982968244050e56357e736b9940c23e77dChris Lattner // visible symbol, DF must be an existing function with internal linkage. 991824684982968244050e56357e736b9940c23e77dChris Lattner // Rename it. 992bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (!NewDF->hasLocalLinkage() && NewDF->getName() != SF->getName()) 993824684982968244050e56357e736b9940c23e77dChris Lattner ForceRenaming(NewDF, SF->getName()); 994eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 995824684982968244050e56357e736b9940c23e77dChris Lattner // ... and remember this mapping... 996824684982968244050e56357e736b9940c23e77dChris Lattner ValueMap[SF] = NewDF; 997824684982968244050e56357e736b9940c23e77dChris Lattner continue; 99897f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner } 999eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 10006157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // If the visibilities of the symbols disagree and the destination is a 10016157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // prototype, take the visibility of its input. 10026157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (DGV->isDeclaration()) 10036157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner DGV->setVisibility(SF->getVisibility()); 1004eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 10056157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (LinkFromSrc) { 10066157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (isa<GlobalAlias>(DGV)) 10076157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner return Error(Err, "Function-Alias Collision on '" + SF->getName() + 10086157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner "': symbol multiple defined"); 1009eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 10106157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // We have a definition of the same name but different type in the 10116157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // source module. Copy the prototype to the destination and replace 10126157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // uses of the destination's prototype with the new prototype. 10136157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner Function *NewDF = Function::Create(SF->getFunctionType(), NewLinkage, 10146157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner SF->getName(), Dest); 10156157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner CopyGVAttributes(NewDF, SF); 1016eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 10176157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Any uses of DF need to change to NewDF, with cast 1018baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson DGV->replaceAllUsesWith(ConstantExpr::getBitCast(NewDF, 1019c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson DGV->getType())); 1020eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 10216157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // DF will conflict with NewDF because they both had the same. We must 10226157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // erase this now so ForceRenaming doesn't assert because DF might 1023eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov // not have internal linkage. 10246157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (GlobalVariable *Var = dyn_cast<GlobalVariable>(DGV)) 10256157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner Var->eraseFromParent(); 10266157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner else 10276157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner cast<Function>(DGV)->eraseFromParent(); 1028eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 10296157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // If the symbol table renamed the function, but it is an externally 1030eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov // visible symbol, DF must be an existing function with internal 10316157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // linkage. Rename it. 1032bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (NewDF->getName() != SF->getName() && !NewDF->hasLocalLinkage()) 10336157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner ForceRenaming(NewDF, SF->getName()); 1034eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 10356157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Remember this mapping so uses in the source module get remapped 10366157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // later by RemapOperand. 10376157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner ValueMap[SF] = NewDF; 1038822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner continue; 1039822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner } 1040eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 10416157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Not "link from source", keep the one in the DestModule and remap the 10426157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // input onto it. 1043eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 10446157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (isa<GlobalAlias>(DGV)) { 10456157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // The only valid mappings are: 10466157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // - SF is external declaration, which is effectively a no-op. 10476157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // - SF is weak, when we just need to throw SF out. 1048a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands if (!SF->isDeclaration() && !SF->isWeakForLinker()) 10496157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner return Error(Err, "Function-Alias Collision on '" + SF->getName() + 10506157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner "': symbol multiple defined"); 1051822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner } 10526157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 10536157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Set calculated linkage 10546157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner DGV->setLinkage(NewLinkage); 10556157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 10566157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Make sure to remember this mapping. 1057baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson ValueMap[SF] = ConstantExpr::getBitCast(DGV, SF->getType()); 10585c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 10595c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 10605c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 10615c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 1062c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBody - Copy the source function over into the dest function and 1063c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// fix up references to values. At this point we know that Dest is an external 1064c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function, and that Src is not. 10654bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattnerstatic bool LinkFunctionBody(Function *Dest, Function *Src, 1066ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer std::map<const Value*, Value*> &ValueMap, 10675c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 10685cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer assert(Src && Dest && Dest->isDeclaration() && !Src->isDeclaration()); 10695c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10700033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner // Go through and convert function arguments over, remembering the mapping. 1071e4d5c441e04bdc00ccf1804744af670655123b07Chris Lattner Function::arg_iterator DI = Dest->arg_begin(); 1072e4d5c441e04bdc00ccf1804744af670655123b07Chris Lattner for (Function::arg_iterator I = Src->arg_begin(), E = Src->arg_end(); 107369da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner I != E; ++I, ++DI) { 10746bc41e8a74d1756da0003641bfebd02a3d6d9586Owen Anderson DI->setName(I->getName()); // Copy the name information over... 10755c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10765c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Add a mapping to our local map 1077817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[I] = DI; 10785c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 10795c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10804bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner // Splice the body of the source function into the dest function. 10814bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner Dest->getBasicBlockList().splice(Dest->end(), Src->getBasicBlockList()); 10825c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 1083c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // At this point, all of the instructions and values of the function are now 1084c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // copied over. The only problem is that they are still referencing values in 1085c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // the Source function as operands. Loop through all of the operands of the 1086c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // functions and patch them up to point to the local versions... 10875c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 108818961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Function::iterator BB = Dest->begin(), BE = Dest->end(); BB != BE; ++BB) 108918961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) 109018961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Instruction::op_iterator OI = I->op_begin(), OE = I->op_end(); 1091221d688a5ef21a22c2368c9fff0e92d7966c95e5Chris Lattner OI != OE; ++OI) 10924bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner if (!isa<Instruction>(*OI) && !isa<BasicBlock>(*OI)) 1093e922c0201916e0b980ab3cfe91e1413e68d55647Owen Anderson *OI = RemapOperand(*OI, ValueMap, Dest->getContext()); 10940033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner 10950033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner // There is no need to map the arguments anymore. 10961127315562b221010040925980040fd4f65bdb1cChris Lattner for (Function::arg_iterator I = Src->arg_begin(), E = Src->arg_end(); 10971127315562b221010040925980040fd4f65bdb1cChris Lattner I != E; ++I) 1098ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ValueMap.erase(I); 10995c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 11005c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 11015c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 11025c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 11035c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 1104c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBodies - Link in the function bodies that are defined in the 1105c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// source module into the DestModule. This consists basically of copying the 1106c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function over and fixing up references to values. 11074bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattnerstatic bool LinkFunctionBodies(Module *Dest, Module *Src, 11085c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 11095c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 11105c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 11118bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer // Loop over all of the functions in the src module, mapping them over as we 11128bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer // go 11134bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner for (Module::iterator SF = Src->begin(), E = Src->end(); SF != E; ++SF) { 1114619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer if (!SF->isDeclaration()) { // No body if function is external 1115ec91ccba3ca92d5e1f19fb0cb6e57a7d4a3f3195Chris Lattner Function *DF = dyn_cast<Function>(ValueMap[SF]); // Destination function 1116c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner 111718961504fc2b299578dba817900a0696cf3ccc4dChris Lattner // DF not external SF external? 1118ec91ccba3ca92d5e1f19fb0cb6e57a7d4a3f3195Chris Lattner if (DF && DF->isDeclaration()) 111935956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner // Only provide the function body if there isn't one already. 112035956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner if (LinkFunctionBody(DF, SF, ValueMap, Err)) 112135956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner return true; 1122c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner } 11235c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 11245c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 11255c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 11265c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 11278166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// LinkAppendingVars - If there were any appending global variables, link them 11288166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// together now. Return true on error. 11298166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattnerstatic bool LinkAppendingVars(Module *M, 11308166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 11318166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::string *ErrorMsg) { 11328166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (AppendingVars.empty()) return false; // Nothing to do. 1133f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 11348166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Loop over the multimap of appending vars, processing any variables with the 11358166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // same name, forming a new appending global variable with both of the 11368166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers merged together, then rewrite references to the old variables 11378166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // and delete them. 11388166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::vector<Constant*> Inits; 11398166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner while (AppendingVars.size() > 1) { 11408166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Get the first two elements in the map... 11418166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, 11428166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable*>::iterator Second = AppendingVars.begin(), First=Second++; 11438166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11448166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If the first two elements are for different names, there is no pair... 11458166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Otherwise there is a pair, so link them together... 11468166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (First->first == Second->first) { 11478166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *G1 = First->second, *G2 = Second->second; 11488166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T1 = cast<ArrayType>(G1->getType()->getElementType()); 11498166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T2 = cast<ArrayType>(G2->getType()->getElementType()); 1150f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 11518166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Check to see that they two arrays agree on type... 11528166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (T1->getElementType() != T2->getElementType()) 11538166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 11548166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables with different element types need to be linked!"); 11558166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (G1->isConstant() != G2->isConstant()) 11568166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 11578166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables linked with different const'ness!"); 11588166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11599613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio if (G1->getAlignment() != G2->getAlignment()) 11609613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio return Error(ErrorMsg, 11619613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio "Appending variables with different alignment need to be linked!"); 11629613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio 11639613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio if (G1->getVisibility() != G2->getVisibility()) 11649613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio return Error(ErrorMsg, 11659613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio "Appending variables with different visibility need to be linked!"); 11669613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio 11679613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio if (G1->getSection() != G2->getSection()) 11689613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio return Error(ErrorMsg, 11699613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio "Appending variables with different section name need to be linked!"); 1170eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 11718166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner unsigned NewSize = T1->getNumElements() + T2->getNumElements(); 1172debcb01b0f0a15f568ca69e8f288fade4bfc7297Owen Anderson ArrayType *NewType = ArrayType::get(T1->getElementType(), 1173c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson NewSize); 11748166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 1175ed74a4ef3b813bed0c0f4bb5af42229d50133da2Chris Lattner G1->setName(""); // Clear G1's name in case of a conflict! 1176eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 11778166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Create the new global variable... 11788166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NG = 1179e9b11b431308f4766b73cda93e38ec930c912122Owen Anderson new GlobalVariable(*M, NewType, G1->isConstant(), G1->getLinkage(), 1180e9b11b431308f4766b73cda93e38ec930c912122Owen Anderson /*init*/0, First->first, 0, G1->isThreadLocal(), 1181a534b0f7bf0248bf90afe97110a34777e972f325Chris Lattner G1->getType()->getAddressSpace()); 11828166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11839613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio // Propagate alignment, visibility and section info. 11849613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio CopyGVAttributes(NG, G1); 11859613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio 11868166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Merge the initializer... 11878166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.reserve(NewSize); 1188de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if (ConstantArray *I = dyn_cast<ConstantArray>(G1->getInitializer())) { 1189de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i) 1190cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos Inits.push_back(I->getOperand(i)); 1191de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } else { 1192de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner assert(isa<ConstantAggregateZero>(G1->getInitializer())); 1193a7235ea7245028a0723e8ab7fd011386b3900777Owen Anderson Constant *CV = Constant::getNullValue(T1->getElementType()); 1194de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i) 1195de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(CV); 1196de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } 1197de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if (ConstantArray *I = dyn_cast<ConstantArray>(G2->getInitializer())) { 1198de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i) 1199cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos Inits.push_back(I->getOperand(i)); 1200de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } else { 1201de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner assert(isa<ConstantAggregateZero>(G2->getInitializer())); 1202a7235ea7245028a0723e8ab7fd011386b3900777Owen Anderson Constant *CV = Constant::getNullValue(T2->getElementType()); 1203de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i) 1204de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(CV); 1205de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } 12061fd7096407d5e598ed3366a1141548e71273f1c5Owen Anderson NG->setInitializer(ConstantArray::get(NewType, Inits)); 12078166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.clear(); 12088166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 12098166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Replace any uses of the two global variables with uses of the new 12108166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // global... 12118166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 12128166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // FIXME: This should rewrite simple/straight-forward uses such as 12138166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // getelementptr instructions to not use the Cast! 1214baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson G1->replaceAllUsesWith(ConstantExpr::getBitCast(NG, 1215c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson G1->getType())); 1216baf3c404409d5e47b13984a7f95bfbd6d1f2e79eOwen Anderson G2->replaceAllUsesWith(ConstantExpr::getBitCast(NG, 1217c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson G2->getType())); 12188166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 12198166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Remove the two globals from the module now... 12208166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G1); 12218166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G2); 12228166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 12238166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Put the new global into the AppendingVars map so that we can handle 12248166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // linking of more than two vars... 12258166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Second->second = NG; 12268166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 12278166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.erase(First); 12288166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 12298166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 12308166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return false; 12318166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner} 123252f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 12339f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikovstatic bool ResolveAliases(Module *Dest) { 12349f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikov for (Module::alias_iterator I = Dest->alias_begin(), E = Dest->alias_end(); 12355241957b1f6876452705f94e0ed60dd2c33a5c84Anton Korobeynikov I != E; ++I) 123619e861a4ffb896f16a691d5ac869e894df3cd464Anton Korobeynikov if (const GlobalValue *GV = I->resolveAliasedGlobal()) 1237832b2a9cd8870211bf2d347d7b435beacbb06c8dAnton Korobeynikov if (GV != I && !GV->isDeclaration()) 12385241957b1f6876452705f94e0ed60dd2c33a5c84Anton Korobeynikov I->replaceAllUsesWith(const_cast<GlobalValue*>(GV)); 12399f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikov 12409f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikov return false; 12419f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikov} 124252f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 124352f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// LinkModules - This function links two modules together, with the resulting 124452f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// left module modified to be the composite of the two input modules. If an 124552f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// error occurs, true is returned and ErrorMsg (if not null) is set to indicate 12465c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// the problem. Upon failure, the Dest module could be in a modified state, and 12475c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// shouldn't be relied on to be consistent. 1248f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukmanbool 12490ba9e211bed7813949aaca97e6b15579c8188e05Reid SpencerLinker::LinkModules(Module *Dest, Module *Src, std::string *ErrorMsg) { 125057a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer assert(Dest != 0 && "Invalid Destination module"); 125157a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer assert(Src != 0 && "Invalid Source Module"); 125257a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 1253c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Dest->getDataLayout().empty()) { 1254c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (!Src->getDataLayout().empty()) { 1255ec9bfdc152a870d3c62377ed6855fb3bff69511cChris Lattner Dest->setDataLayout(Src->getDataLayout()); 1256c36357c406911ded5a0e2924998d885815370fdbChris Lattner } else { 1257c36357c406911ded5a0e2924998d885815370fdbChris Lattner std::string DataLayout; 1258c36357c406911ded5a0e2924998d885815370fdbChris Lattner 1259a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov if (Dest->getEndianness() == Module::AnyEndianness) { 1260c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Src->getEndianness() == Module::BigEndian) 1261c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append("E"); 1262c36357c406911ded5a0e2924998d885815370fdbChris Lattner else if (Src->getEndianness() == Module::LittleEndian) 1263c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append("e"); 1264a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov } 1265a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov 1266a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov if (Dest->getPointerSize() == Module::AnyPointerSize) { 1267c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Src->getPointerSize() == Module::Pointer64) 1268c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append(DataLayout.length() == 0 ? "p:64:64" : "-p:64:64"); 1269c36357c406911ded5a0e2924998d885815370fdbChris Lattner else if (Src->getPointerSize() == Module::Pointer32) 1270c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append(DataLayout.length() == 0 ? "p:32:32" : "-p:32:32"); 1271a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov } 1272c36357c406911ded5a0e2924998d885815370fdbChris Lattner Dest->setDataLayout(DataLayout); 1273c36357c406911ded5a0e2924998d885815370fdbChris Lattner } 1274c36357c406911ded5a0e2924998d885815370fdbChris Lattner } 1275873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner 1276f27dfcb210fec571d79bc881f5463e0b405707c0Chris Lattner // Copy the target triple from the source to dest if the dest's is empty. 1277c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Dest->getTargetTriple().empty() && !Src->getTargetTriple().empty()) 1278c36357c406911ded5a0e2924998d885815370fdbChris Lattner Dest->setTargetTriple(Src->getTargetTriple()); 1279eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 1280c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (!Src->getDataLayout().empty() && !Dest->getDataLayout().empty() && 1281c36357c406911ded5a0e2924998d885815370fdbChris Lattner Src->getDataLayout() != Dest->getDataLayout()) 1282bdff548e4dd577a72094d57b282de4e765643b96Chris Lattner errs() << "WARNING: Linking two modules of different data layouts!\n"; 1283152f19ac6514ec29e183ddcdf2ea71599638dc4cChris Lattner if (!Src->getTargetTriple().empty() && 1284152f19ac6514ec29e183ddcdf2ea71599638dc4cChris Lattner Dest->getTargetTriple() != Src->getTargetTriple()) 1285bdff548e4dd577a72094d57b282de4e765643b96Chris Lattner errs() << "WARNING: Linking two modules of different target triples!\n"; 1286f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 1287f27dfcb210fec571d79bc881f5463e0b405707c0Chris Lattner // Append the module inline asm string. 12886631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner if (!Src->getModuleInlineAsm().empty()) { 12896631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner if (Dest->getModuleInlineAsm().empty()) 12906631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner Dest->setModuleInlineAsm(Src->getModuleInlineAsm()); 1291e1b2e14f92e8e9da1eb4854511a881cf9c22af3cChris Lattner else 12926631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner Dest->setModuleInlineAsm(Dest->getModuleInlineAsm()+"\n"+ 12936631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner Src->getModuleInlineAsm()); 1294e1b2e14f92e8e9da1eb4854511a881cf9c22af3cChris Lattner } 1295eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 1296719012d6254ee425464f034250176283fb96793bReid Spencer // Update the destination module's dependent libraries list with the libraries 129757a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // from the source module. There's no opportunity for duplicates here as the 129857a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // Module ensures that duplicate insertions are discarded. 1299f27dfcb210fec571d79bc881f5463e0b405707c0Chris Lattner for (Module::lib_iterator SI = Src->lib_begin(), SE = Src->lib_end(); 1300eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov SI != SE; ++SI) 130157a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer Dest->addLibrary(*SI); 130257a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 13032c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // LinkTypes - Go through the symbol table of the Src module and see if any 13042c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // types are named in the src module that are not named in the Dst module. 13052c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Make sure there are no type name conflicts. 1306eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov if (LinkTypes(Dest, Src, ErrorMsg)) 1307619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer return true; 13082c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 13095c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // ValueMap - Mapping of values from what they used to be in Src, to what they 13105c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // are now in Dest. 13115c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> ValueMap; 13125c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 13138166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars - Keep track of global variables in the destination module 13148166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // with appending linkage. After the module is linked together, they are 13158166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // appended and the module is rewritten. 13168166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> AppendingVars; 13171127315562b221010040925980040fd4f65bdb1cChris Lattner for (Module::global_iterator I = Dest->global_begin(), E = Dest->global_end(); 13181127315562b221010040925980040fd4f65bdb1cChris Lattner I != E; ++I) { 13195a837defff581accc09048bea1cd839009e374a7Chris Lattner // Add all of the appending globals already in the Dest module to 13205a837defff581accc09048bea1cd839009e374a7Chris Lattner // AppendingVars. 1321f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner if (I->hasAppendingLinkage()) 1322f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner AppendingVars.insert(std::make_pair(I->getName(), I)); 13235a837defff581accc09048bea1cd839009e374a7Chris Lattner } 13245a837defff581accc09048bea1cd839009e374a7Chris Lattner 1325ab67e705f59d567afded845465f358b8a66ab62eDevang Patel // Insert all of the named mdnoes in Src into the Dest module. 1326ab67e705f59d567afded845465f358b8a66ab62eDevang Patel LinkNamedMDNodes(Dest, Src); 1327ab67e705f59d567afded845465f358b8a66ab62eDevang Patel 13288166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Insert all of the globals in src into the Dest module... without linking 13298166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers (which could refer to functions not yet mapped over). 1330ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (LinkGlobals(Dest, Src, ValueMap, AppendingVars, ErrorMsg)) 13315a837defff581accc09048bea1cd839009e374a7Chris Lattner return true; 13325c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 1333c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link the functions together between the two modules, without doing function 1334c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // bodies... this just adds external function prototypes to the Dest 1335c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // function... We do this so that when we begin processing function bodies, 1336c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // all of the global values that may be referenced are available in our 1337c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // ValueMap. 1338ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (LinkFunctionProtos(Dest, Src, ValueMap, ErrorMsg)) 13395a837defff581accc09048bea1cd839009e374a7Chris Lattner return true; 13405c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 13414fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov // If there were any alias, link them now. We really need to do this now, 13424fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov // because all of the aliases that may be referenced need to be available in 13434fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov // ValueMap 13444fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov if (LinkAlias(Dest, Src, ValueMap, ErrorMsg)) return true; 13454fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov 13466cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // Update the initializers in the Dest module now that all globals that may 13476cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // be referenced are in Dest. 13486cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner if (LinkGlobalInits(Dest, Src, ValueMap, ErrorMsg)) return true; 13496cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner 1350c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link in the function bodies that are defined in the source module into the 1351c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // DestModule. This consists basically of copying the function over and 1352c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // fixing up references to values. 135379df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner if (LinkFunctionBodies(Dest, Src, ValueMap, ErrorMsg)) return true; 135452f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 13558166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If there were any appending global variables, link them together now. 13568166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (LinkAppendingVars(Dest, AppendingVars, ErrorMsg)) return true; 13578166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 13583db9191baf5f5229a2f4d204c6332ba27fff81d0Anton Korobeynikov // Resolve all uses of aliases with aliasees 13593db9191baf5f5229a2f4d204c6332ba27fff81d0Anton Korobeynikov if (ResolveAliases(Dest)) return true; 13603db9191baf5f5229a2f4d204c6332ba27fff81d0Anton Korobeynikov 136157a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // If the source library's module id is in the dependent library list of the 136257a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // destination library, remove it since that module is now linked in. 136357a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer sys::Path modId; 1364dd04df0ec33a903ee7fc747701bafde622f77d8bReid Spencer modId.set(Src->getModuleIdentifier()); 136507adb2836b8aa7a3872e33c285958f5937662b50Reid Spencer if (!modId.isEmpty()) 136607adb2836b8aa7a3872e33c285958f5937662b50Reid Spencer Dest->removeLibrary(modId.getBasename()); 136757a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 136852f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner return false; 136952f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner} 13709466f5113ba859677a28887c3c7143065e702019Vikram S. Adve 1371567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer// vim: sw=2 1372