LinkModules.cpp revision e9b11b431308f4766b73cda93e38ec930c912122
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" 2841edad7e4b8872414564dea5fb41fa6194375355Bill Wendling#include "llvm/Support/Streams.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... 368166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattnerstatic inline bool Error(std::string *E, const std::string &Message) { 375c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner if (E) *E = Message; 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 { 14762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner cerr << "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) { 340e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << " Fr: " << (void*)I->first << " "; 34187182ae6baf28ca6da6ee4bc00cf1857f293acfeChris Lattner I->first->dump(); 342e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << " To: " << (void*)I->second << " "; 34387182ae6baf28ca6da6ee4bc00cf1857f293acfeChris Lattner I->second->dump(); 344e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << "\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 = 371c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson Context.getConstantArray(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 = 378c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson Context.getConstantStruct(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)); 386c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson Result = Context.getConstantVector(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?"); 3958d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner assert(0 && "Unknown type of derived type constant value!"); 3968d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 397620fd68b1086b4d99b23951357299bee357aa62aChris Lattner } else if (isa<InlineAsm>(In)) { 398620fd68b1086b4d99b23951357299bee357aa62aChris Lattner Result = const_cast<Value*>(In); 399620fd68b1086b4d99b23951357299bee357aa62aChris Lattner } 400eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 401619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer // Cache the mapping in our local map structure 402620fd68b1086b4d99b23951357299bee357aa62aChris Lattner if (Result) { 403817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[In] = Result; 4048d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return Result; 4058d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 406eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 4070bb8757997392ee18ca9de0f1fab29463f8e7aebChris Lattner#ifndef NDEBUG 408e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << "LinkModules ValueMap: \n"; 4090033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner PrintMap(ValueMap); 4102d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 411e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << "Couldn't remap value: " << (void*)In << " " << *In << "\n"; 4128d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner assert(0 && "Couldn't remap value!"); 4130bb8757997392ee18ca9de0f1fab29463f8e7aebChris Lattner#endif 4148d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return 0; 4155c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 4165c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4178bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer/// ForceRenaming - The LLVM SymbolTable class autorenames globals that conflict 4188bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer/// in the symbol table. This is good for all clients except for us. Go 4198bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer/// through the trouble to force this back. 420c003628a612d3687fb77088a5894314210a65385Chris Lattnerstatic void ForceRenaming(GlobalValue *GV, const std::string &Name) { 421c003628a612d3687fb77088a5894314210a65385Chris Lattner assert(GV->getName() != Name && "Can't force rename to self"); 422ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ValueSymbolTable &ST = GV->getParent()->getValueSymbolTable(); 423c003628a612d3687fb77088a5894314210a65385Chris Lattner 424c003628a612d3687fb77088a5894314210a65385Chris Lattner // If there is a conflict, rename the conflict. 42533f294930e0affa51c3818405741abd80cc90316Chris Lattner if (GlobalValue *ConflictGV = cast_or_null<GlobalValue>(ST.lookup(Name))) { 426bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola assert(ConflictGV->hasLocalLinkage() && 427ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer "Not conflicting with a static global, should link instead!"); 42833f294930e0affa51c3818405741abd80cc90316Chris Lattner GV->takeName(ConflictGV); 42933f294930e0affa51c3818405741abd80cc90316Chris Lattner ConflictGV->setName(Name); // This will cause ConflictGV to get renamed 430ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer assert(ConflictGV->getName() != Name && "ForceRenaming didn't work"); 43133f294930e0affa51c3818405741abd80cc90316Chris Lattner } else { 43233f294930e0affa51c3818405741abd80cc90316Chris Lattner GV->setName(Name); // Force the name back 433ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer } 434ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer} 435ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer 436ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer/// CopyGVAttributes - copy additional attributes (those not needed to construct 437eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov/// a GlobalValue) from the SrcGV to the DestGV. 438ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencerstatic void CopyGVAttributes(GlobalValue *DestGV, const GlobalValue *SrcGV) { 43928c3cff8250b3fe2adc6479306fe7dbdb48a1bdbDuncan Sands // Use the maximum alignment, rather than just copying the alignment of SrcGV. 44028c3cff8250b3fe2adc6479306fe7dbdb48a1bdbDuncan Sands unsigned Alignment = std::max(DestGV->getAlignment(), SrcGV->getAlignment()); 44128c3cff8250b3fe2adc6479306fe7dbdb48a1bdbDuncan Sands DestGV->copyAttributesFrom(SrcGV); 44228c3cff8250b3fe2adc6479306fe7dbdb48a1bdbDuncan Sands DestGV->setAlignment(Alignment); 443c003628a612d3687fb77088a5894314210a65385Chris Lattner} 444c003628a612d3687fb77088a5894314210a65385Chris Lattner 445aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// GetLinkageResult - This analyzes the two global values and determines what 446aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// the result will look like in the destination module. In particular, it 447aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// computes the resultant linkage type, computes whether the global in the 448aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// source should be copied over to the destination (replacing the existing 4499cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov/// one), and computes whether this linkage is an error or not. It also performs 4509cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov/// visibility checks: we cannot link together two symbols with different 4519cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov/// visibilities. 452968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikovstatic bool GetLinkageResult(GlobalValue *Dest, const GlobalValue *Src, 453aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner GlobalValue::LinkageTypes <, bool &LinkFromSrc, 454aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner std::string *Err) { 455bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola assert((!Dest || !Src->hasLocalLinkage()) && 456aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "If Src has internal linkage, Dest shouldn't be set!"); 457aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (!Dest) { 458aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // Linking something to nothing. 459aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 460aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 4615cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer } else if (Src->isDeclaration()) { 4622b48ef0450944c2c46633aec9baf6be835a3b503Anton Korobeynikov // If Src is external or if both Src & Dest are external.. Just link the 463aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // external globals, we aren't adding anything. 464b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov if (Src->hasDLLImportLinkage()) { 46578ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // If one of GVs has DLLImport linkage, result should be dllimport'ed. 4665cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer if (Dest->isDeclaration()) { 467b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LinkFromSrc = true; 468b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LT = Src->getLinkage(); 469eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov } 4708753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth } else if (Dest->hasExternalWeakLinkage()) { 471667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands // If the Dest is weak, use the source linkage. 4728753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth LinkFromSrc = true; 4738753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth LT = Src->getLinkage(); 474b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } else { 475b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LinkFromSrc = false; 476b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LT = Dest->getLinkage(); 477b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } 4785cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer } else if (Dest->isDeclaration() && !Dest->hasDLLImportLinkage()) { 479aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // If Dest is external but Src is not: 480aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 481aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 482aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else if (Src->hasAppendingLinkage() || Dest->hasAppendingLinkage()) { 483aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (Src->getLinkage() != Dest->getLinkage()) 484aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner return Error(Err, "Linking globals named '" + Src->getName() + 485aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "': can only link appending global with another appending global!"); 486aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; // Special cased. 487aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 488a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands } else if (Src->isWeakForLinker()) { 489aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen // At this point we know that Dest has LinkOnce, External*, Weak, Common, 490aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen // or DLL* linkage. 491266c7bbbbcc4b326dea82e577de1a415d6acc23eChris Lattner if (Dest->hasExternalWeakLinkage() || 492266c7bbbbcc4b326dea82e577de1a415d6acc23eChris Lattner Dest->hasAvailableExternallyLinkage() || 493266c7bbbbcc4b326dea82e577de1a415d6acc23eChris Lattner (Dest->hasLinkOnceLinkage() && 494266c7bbbbcc4b326dea82e577de1a415d6acc23eChris Lattner (Src->hasWeakLinkage() || Src->hasCommonLinkage()))) { 495aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 496aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 497aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else { 498aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = false; 499aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Dest->getLinkage(); 500aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 501a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands } else if (Dest->isWeakForLinker()) { 50278ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // At this point we know that Src has External* or DLL* linkage. 50378ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov if (Src->hasExternalWeakLinkage()) { 50478ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LinkFromSrc = false; 50578ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LT = Dest->getLinkage(); 50678ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov } else { 50778ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LinkFromSrc = true; 50878ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LT = GlobalValue::ExternalLinkage; 50978ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov } 510aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else { 511b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov assert((Dest->hasExternalLinkage() || 512b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov Dest->hasDLLImportLinkage() || 51378ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Dest->hasDLLExportLinkage() || 51478ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Dest->hasExternalWeakLinkage()) && 515b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov (Src->hasExternalLinkage() || 516b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov Src->hasDLLImportLinkage() || 51778ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Src->hasDLLExportLinkage() || 51878ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Src->hasExternalWeakLinkage()) && 519aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "Unexpected linkage type!"); 520f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman return Error(Err, "Linking globals named '" + Src->getName() + 521aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "': symbol multiply defined!"); 522aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 5239cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov 5249cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov // Check visibility 5259cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov if (Dest && Src->getVisibility() != Dest->getVisibility()) 52697f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner if (!Src->isDeclaration() && !Dest->isDeclaration()) 52797f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner return Error(Err, "Linking globals named '" + Src->getName() + 52897f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner "': symbols have different visibilities!"); 529aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner return false; 530aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner} 5315c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 5325c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// LinkGlobals - Loop through the global variables in the src module and merge 5338166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// them into the dest module. 534968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikovstatic bool LinkGlobals(Module *Dest, const Module *Src, 5355c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 5368166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 5375c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 538d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner ValueSymbolTable &DestSymTab = Dest->getValueSymbolTable(); 539c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson LLVMContext &Context = Dest->getContext(); 540eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 5415c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 5420bb8757997392ee18ca9de0f1fab29463f8e7aebChris Lattner for (Module::const_global_iterator I = Src->global_begin(), 5430bb8757997392ee18ca9de0f1fab29463f8e7aebChris Lattner E = Src->global_end(); I != E; ++I) { 544968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov const GlobalVariable *SGV = I; 54501f69399352380532d480f6749daed660f50b15cAnton Korobeynikov GlobalValue *DGV = 0; 54601f69399352380532d480f6749daed660f50b15cAnton Korobeynikov 547d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // Check to see if may have to link the global with the global, alias or 548d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // function. 549bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (SGV->hasName() && !SGV->hasLocalLinkage()) 550d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner DGV = cast_or_null<GlobalValue>(DestSymTab.lookup(SGV->getNameStart(), 551d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner SGV->getNameEnd())); 552eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 553ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner // If we found a global with the same name in the dest module, but it has 554ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner // internal linkage, we are really not doing any linkage here. 555bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (DGV && DGV->hasLocalLinkage()) 556ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner DGV = 0; 557eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 558d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // If types don't agree due to opaque types, try to resolve them. 559d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner if (DGV && DGV->getType() != SGV->getType()) 560d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner RecursiveResolveTypes(SGV->getType(), DGV->getType()); 56101f69399352380532d480f6749daed660f50b15cAnton Korobeynikov 562c318329a1098a19137398af4d880f4d8cdd9cd8dDan Gohman assert((SGV->hasInitializer() || SGV->hasExternalWeakLinkage() || 563c318329a1098a19137398af4d880f4d8cdd9cd8dDan Gohman SGV->hasExternalLinkage() || SGV->hasDLLImportLinkage()) && 5644ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner "Global must either be external or have an initializer!"); 5655c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 566b324bd735ff5c99a52cd3c3f5d01c0e1398a2d3aChris Lattner GlobalValue::LinkageTypes NewLinkage = GlobalValue::InternalLinkage; 567b324bd735ff5c99a52cd3c3f5d01c0e1398a2d3aChris Lattner bool LinkFromSrc = false; 568aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (GetLinkageResult(DGV, SGV, NewLinkage, LinkFromSrc, Err)) 569aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner return true; 5700fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner 5716157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (DGV == 0) { 5725c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // No linking to be performed, simply create an identical version of the 5738d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // symbol over in the dest module... the initializer will be filled in 574d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // later by LinkGlobalInits. 5752719bac90525985f4ebb97324b4c087d47b54384Chris Lattner GlobalVariable *NewDGV = 576e9b11b431308f4766b73cda93e38ec930c912122Owen Anderson new GlobalVariable(*Dest, SGV->getType()->getElementType(), 5772719bac90525985f4ebb97324b4c087d47b54384Chris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 578e9b11b431308f4766b73cda93e38ec930c912122Owen Anderson SGV->getName(), 0, false, 579a534b0f7bf0248bf90afe97110a34777e972f325Chris Lattner SGV->getType()->getAddressSpace()); 580471feac1b297b9458de18d973af371bf7f10296bReid Spencer // Propagate alignment, visibility and section info. 581ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer CopyGVAttributes(NewDGV, SGV); 5825dfbaf1fe3fa6914095cc55cde20b1ed25187b56Andrew Lenharth 5832719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // If the LLVM runtime renamed the global, but it is an externally visible 5842719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // symbol, DGV must be an existing global with internal linkage. Rename 5852719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // it. 586bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (!NewDGV->hasLocalLinkage() && NewDGV->getName() != SGV->getName()) 587c003628a612d3687fb77088a5894314210a65385Chris Lattner ForceRenaming(NewDGV, SGV->getName()); 5885c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 5896157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Make sure to remember this mapping. 590817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[SGV] = NewDGV; 591817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov 592d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // Keep track that this is an appending variable. 5938166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (SGV->hasAppendingLinkage()) 5948166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV)); 5956157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner continue; 5966157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner } 597eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 5986157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // If the visibilities of the symbols disagree and the destination is a 5996157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // prototype, take the visibility of its input. 6006157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (DGV->isDeclaration()) 6016157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner DGV->setVisibility(SGV->getVisibility()); 602eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 6036157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (DGV->hasAppendingLinkage()) { 6048166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // No linking is performed yet. Just insert a new copy of the global, and 6058166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // keep track of the fact that it is an appending variable in the 6068166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars map. The name is cleared out so that no linkage is 6078166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // performed. 6088166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NewDGV = 609e9b11b431308f4766b73cda93e38ec930c912122Owen Anderson new GlobalVariable(*Dest, SGV->getType()->getElementType(), 6108166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 611e9b11b431308f4766b73cda93e38ec930c912122Owen Anderson "", 0, false, 612a534b0f7bf0248bf90afe97110a34777e972f325Chris Lattner SGV->getType()->getAddressSpace()); 6138166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 61475c7915c3a24f8063c274ccffe2dc9b7bc8bce1fAnton Korobeynikov // Set alignment allowing CopyGVAttributes merge it with alignment of SGV. 615ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer NewDGV->setAlignment(DGV->getAlignment()); 61675c7915c3a24f8063c274ccffe2dc9b7bc8bce1fAnton Korobeynikov // Propagate alignment, section and visibility info. 617ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer CopyGVAttributes(NewDGV, SGV); 6185dfbaf1fe3fa6914095cc55cde20b1ed25187b56Andrew Lenharth 6198166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Make sure to remember this mapping... 620817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[SGV] = NewDGV; 6218166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 6228166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Keep track that this is an appending variable... 6238166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV)); 6246157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner continue; 6256157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner } 626eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 6276157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (LinkFromSrc) { 6286157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (isa<GlobalAlias>(DGV)) 6291438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Global-Alias Collision on '" + SGV->getName() + 6301438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': symbol multiple defined"); 631eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 632d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // If the types don't match, and if we are to link from the source, nuke 633d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // DGV and create a new one of the appropriate type. Note that the thing 634d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // we are replacing may be a function (if a prototype, weak, etc) or a 635d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // global variable. 636d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner GlobalVariable *NewDGV = 637e9b11b431308f4766b73cda93e38ec930c912122Owen Anderson new GlobalVariable(*Dest, SGV->getType()->getElementType(), 6383d29df3e8a203b167d8071ea6f805b21db18a5afOwen Anderson SGV->isConstant(), NewLinkage, /*init*/0, 639e9b11b431308f4766b73cda93e38ec930c912122Owen Anderson DGV->getName(), 0, false, 640d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner SGV->getType()->getAddressSpace()); 641eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 642d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // Propagate alignment, section, and visibility info. 643d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner CopyGVAttributes(NewDGV, SGV); 644c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson DGV->replaceAllUsesWith(Context.getConstantExprBitCast(NewDGV, 645c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson DGV->getType())); 646eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 647d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // DGV will conflict with NewDGV because they both had the same 648d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // name. We must erase this now so ForceRenaming doesn't assert 649d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // because DGV might not have internal linkage. 650d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner if (GlobalVariable *Var = dyn_cast<GlobalVariable>(DGV)) 651d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner Var->eraseFromParent(); 652d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner else 653d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner cast<Function>(DGV)->eraseFromParent(); 654d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner DGV = NewDGV; 655d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner 656d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // If the symbol table renamed the global, but it is an externally visible 657d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // symbol, DGV must be an existing global with internal linkage. Rename. 658bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (NewDGV->getName() != SGV->getName() && !NewDGV->hasLocalLinkage()) 659d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner ForceRenaming(NewDGV, SGV->getName()); 660eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 6616157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Inherit const as appropriate. 662d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner NewDGV->setConstant(SGV->isConstant()); 663eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 6646157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Make sure to remember this mapping. 6656157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner ValueMap[SGV] = NewDGV; 6666157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner continue; 6675c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 668eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 6696157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Not "link from source", keep the one in the DestModule and remap the 6706157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // input onto it. 671eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 6726157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Special case for const propagation. 6736157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (GlobalVariable *DGVar = dyn_cast<GlobalVariable>(DGV)) 6746157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (DGVar->isDeclaration() && SGV->isConstant() && !DGVar->isConstant()) 6756157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner DGVar->setConstant(true); 6766157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 677d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // SGV is global, but DGV is alias. 678d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov if (isa<GlobalAlias>(DGV)) { 679d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // The only valid mappings are: 680d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // - SGV is external declaration, which is effectively a no-op. 681d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // - SGV is weak, when we just need to throw SGV out. 682a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands if (!SGV->isDeclaration() && !SGV->isWeakForLinker()) 683d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov return Error(Err, "Global-Alias Collision on '" + SGV->getName() + 684d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov "': symbol multiple defined"); 685d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov } 686eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 6876157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Set calculated linkage 6886157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner DGV->setLinkage(NewLinkage); 689eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 6906157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Make sure to remember this mapping... 691c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson ValueMap[SGV] = Context.getConstantExprBitCast(DGV, SGV->getType()); 6925c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 6935c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 6945c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 6955c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 69658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikovstatic GlobalValue::LinkageTypes 69758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton KorobeynikovCalculateAliasLinkage(const GlobalValue *SGV, const GlobalValue *DGV) { 698667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands GlobalValue::LinkageTypes SL = SGV->getLinkage(); 699667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands GlobalValue::LinkageTypes DL = DGV->getLinkage(); 700667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands if (SL == GlobalValue::ExternalLinkage || DL == GlobalValue::ExternalLinkage) 70158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov return GlobalValue::ExternalLinkage; 702667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands else if (SL == GlobalValue::WeakAnyLinkage || 703667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands DL == GlobalValue::WeakAnyLinkage) 704667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands return GlobalValue::WeakAnyLinkage; 705667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands else if (SL == GlobalValue::WeakODRLinkage || 706667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands DL == GlobalValue::WeakODRLinkage) 707667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands return GlobalValue::WeakODRLinkage; 708667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands else if (SL == GlobalValue::InternalLinkage && 709667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands DL == GlobalValue::InternalLinkage) 71058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov return GlobalValue::InternalLinkage; 711bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola else { 712667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands assert (SL == GlobalValue::PrivateLinkage && 713667d4b8de6dea70195ff12ef39a4deebffa2f5c7Duncan Sands DL == GlobalValue::PrivateLinkage && "Unexpected linkage type"); 714bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola return GlobalValue::PrivateLinkage; 71558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } 71658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov} 71758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 71831ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio// LinkAlias - Loop through the alias in the src module and link them into the 71958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov// dest module. We're assuming, that all functions/global variables were already 72058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov// linked in. 7214fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikovstatic bool LinkAlias(Module *Dest, const Module *Src, 7224fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov std::map<const Value*, Value*> &ValueMap, 7234fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov std::string *Err) { 724c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson LLVMContext &Context = Dest->getContext(); 725c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson 72631ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio // Loop over all alias in the src module 72731ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio for (Module::const_alias_iterator I = Src->alias_begin(), 72831ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio E = Src->alias_end(); I != E; ++I) { 72958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov const GlobalAlias *SGA = I; 73058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov const GlobalValue *SAliasee = SGA->getAliasedGlobal(); 73158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov GlobalAlias *NewGA = NULL; 73258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 73358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Globals were already linked, thus we can just query ValueMap for variant 734caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // of SAliasee in Dest. 73558d5e051574339106ce4139697ebadd21e34dbc0Ted Kremenek std::map<const Value*,Value*>::const_iterator VMI = ValueMap.find(SAliasee); 73658d5e051574339106ce4139697ebadd21e34dbc0Ted Kremenek assert(VMI != ValueMap.end() && "Aliasee not linked"); 73758d5e051574339106ce4139697ebadd21e34dbc0Ted Kremenek GlobalValue* DAliasee = cast<GlobalValue>(VMI->second); 738caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov GlobalValue* DGV = NULL; 73958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 74058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Try to find something 'similar' to SGA in destination module. 741bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (!DGV && !SGA->hasLocalLinkage()) { 742caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGV = Dest->getNamedAlias(SGA->getName()); 743caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 744caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // If types don't agree due to opaque types, try to resolve them. 745caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (DGV && DGV->getType() != SGA->getType()) 7465ed2ba26680f06846e7602ce65432b0a723b1273Chris Lattner RecursiveResolveTypes(SGA->getType(), DGV->getType()); 747caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } 748caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 749bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (!DGV && !SGA->hasLocalLinkage()) { 750caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGV = Dest->getGlobalVariable(SGA->getName()); 751caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 75258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // If types don't agree due to opaque types, try to resolve them. 753caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (DGV && DGV->getType() != SGA->getType()) 7545ed2ba26680f06846e7602ce65432b0a723b1273Chris Lattner RecursiveResolveTypes(SGA->getType(), DGV->getType()); 755caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } 75658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 757bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (!DGV && !SGA->hasLocalLinkage()) { 758caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGV = Dest->getFunction(SGA->getName()); 759caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 760caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // If types don't agree due to opaque types, try to resolve them. 761caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (DGV && DGV->getType() != SGA->getType()) 7625ed2ba26680f06846e7602ce65432b0a723b1273Chris Lattner RecursiveResolveTypes(SGA->getType(), DGV->getType()); 763caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } 764caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 765caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // No linking to be performed on internal stuff. 766bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (DGV && DGV->hasLocalLinkage()) 767caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGV = NULL; 768caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 769caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (GlobalAlias *DGA = dyn_cast_or_null<GlobalAlias>(DGV)) { 770caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // Types are known to be the same, check whether aliasees equal. As 77158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // globals are already linked we just need query ValueMap to find the 77258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // mapping. 77358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov if (DAliasee == DGA->getAliasedGlobal()) { 77458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // This is just two copies of the same alias. Propagate linkage, if 77558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // necessary. 77658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov DGA->setLinkage(CalculateAliasLinkage(SGA, DGA)); 77758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 77858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov NewGA = DGA; 77958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Proceed to 'common' steps 78058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } else 7811438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Alias Collision on '" + SGA->getName()+ 7821438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': aliases have different aliasees"); 783caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } else if (GlobalVariable *DGVar = dyn_cast_or_null<GlobalVariable>(DGV)) { 784f88bc65932e5cf41ba6ca706cd1b1b1f65300248Anton Korobeynikov // The only allowed way is to link alias with external declaration or weak 785f88bc65932e5cf41ba6ca706cd1b1b1f65300248Anton Korobeynikov // symbol.. 786a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands if (DGVar->isDeclaration() || DGVar->isWeakForLinker()) { 787ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov // But only if aliasee is global too... 788ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov if (!isa<GlobalVariable>(DAliasee)) 789caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov return Error(Err, "Global-Alias Collision on '" + SGA->getName() + 790caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov "': aliasee is not global variable"); 791ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov 79258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov NewGA = new GlobalAlias(SGA->getType(), SGA->getLinkage(), 79358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov SGA->getName(), DAliasee, Dest); 79458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov CopyGVAttributes(NewGA, SGA); 79558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 79658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Any uses of DGV need to change to NewGA, with cast, if needed. 797caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (SGA->getType() != DGVar->getType()) 798c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson DGVar->replaceAllUsesWith(Context.getConstantExprBitCast(NewGA, 799caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGVar->getType())); 80058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov else 801caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGVar->replaceAllUsesWith(NewGA); 80258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 803caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // DGVar will conflict with NewGA because they both had the same 80458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // name. We must erase this now so ForceRenaming doesn't assert 80558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // because DGV might not have internal linkage. 806caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGVar->eraseFromParent(); 80758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 80858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Proceed to 'common' steps 80958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } else 8101438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Global-Alias Collision on '" + SGA->getName() + 8111438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': symbol multiple defined"); 812caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } else if (Function *DF = dyn_cast_or_null<Function>(DGV)) { 813f88bc65932e5cf41ba6ca706cd1b1b1f65300248Anton Korobeynikov // The only allowed way is to link alias with external declaration or weak 814f88bc65932e5cf41ba6ca706cd1b1b1f65300248Anton Korobeynikov // symbol... 815a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands if (DF->isDeclaration() || DF->isWeakForLinker()) { 816ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov // But only if aliasee is function too... 817ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov if (!isa<Function>(DAliasee)) 818caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov return Error(Err, "Function-Alias Collision on '" + SGA->getName() + 819caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov "': aliasee is not function"); 820ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov 821b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov NewGA = new GlobalAlias(SGA->getType(), SGA->getLinkage(), 822b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov SGA->getName(), DAliasee, Dest); 823b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov CopyGVAttributes(NewGA, SGA); 824b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov 825b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // Any uses of DF need to change to NewGA, with cast, if needed. 826b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov if (SGA->getType() != DF->getType()) 827c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson DF->replaceAllUsesWith(Context.getConstantExprBitCast(NewGA, 828b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov DF->getType())); 829b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov else 830b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov DF->replaceAllUsesWith(NewGA); 831b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov 832b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // DF will conflict with NewGA because they both had the same 833b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // name. We must erase this now so ForceRenaming doesn't assert 834b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // because DF might not have internal linkage. 835b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov DF->eraseFromParent(); 836b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov 837b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // Proceed to 'common' steps 838b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov } else 8391438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Function-Alias Collision on '" + SGA->getName() + 8401438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': symbol multiple defined"); 84158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } else { 842caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // No linking to be performed, simply create an identical version of the 843caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // alias over in the dest module... 84458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 84558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov NewGA = new GlobalAlias(SGA->getType(), SGA->getLinkage(), 84658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov SGA->getName(), DAliasee, Dest); 84758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov CopyGVAttributes(NewGA, SGA); 84858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 84958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Proceed to 'common' steps 85058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } 85158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 85258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov assert(NewGA && "No alias was created in destination module!"); 85358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 854b8cdaf7099898d7c0eef4769bf6a89f39e7decc2Anton Korobeynikov // If the symbol table renamed the alias, but it is an externally visible 855caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // symbol, DGA must be an global value with internal linkage. Rename it. 85658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov if (NewGA->getName() != SGA->getName() && 857bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola !NewGA->hasLocalLinkage()) 85858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov ForceRenaming(NewGA, SGA->getName()); 85958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 86058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Remember this mapping so uses in the source module get remapped 86158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // later by RemapOperand. 862817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[SGA] = NewGA; 86331ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio } 86458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 86531ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio return false; 86631ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio} 86731ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio 8685c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 8698d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// LinkGlobalInits - Update the initializers in the Dest module now that all 8708d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// globals that may be referenced are in Dest. 8718d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattnerstatic bool LinkGlobalInits(Module *Dest, const Module *Src, 8725c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 8735c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 8748d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 8751127315562b221010040925980040fd4f65bdb1cChris Lattner for (Module::const_global_iterator I = Src->global_begin(), 8761127315562b221010040925980040fd4f65bdb1cChris Lattner E = Src->global_end(); I != E; ++I) { 87718961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const GlobalVariable *SGV = I; 8788d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 8798d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner if (SGV->hasInitializer()) { // Only process initialized GV's 8808d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Figure out what the initializer looks like in the dest module... 8814ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner Constant *SInit = 882c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson cast<Constant>(RemapOperand(SGV->getInitializer(), ValueMap, 883c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson Dest->getContext())); 884d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // Grab destination global variable or alias. 885d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov GlobalValue *DGV = cast<GlobalValue>(ValueMap[SGV]->stripPointerCasts()); 886d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov 887d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // If dest if global variable, check that initializers match. 888d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov if (GlobalVariable *DGVar = dyn_cast<GlobalVariable>(DGV)) { 889d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov if (DGVar->hasInitializer()) { 890d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov if (SGV->hasExternalLinkage()) { 891d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov if (DGVar->getInitializer() != SInit) 892d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov return Error(Err, "Global Variable Collision on '" + 893d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov SGV->getName() + 894d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov "': global variables have different initializers"); 895a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands } else if (DGVar->isWeakForLinker()) { 896d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // Nothing is required, mapped values will take the new global 897d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // automatically. 898a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands } else if (SGV->isWeakForLinker()) { 899d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // Nothing is required, mapped values will take the new global 900d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // automatically. 901d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov } else if (DGVar->hasAppendingLinkage()) { 902d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov assert(0 && "Appending linkage unimplemented!"); 903d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov } else { 904d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov assert(0 && "Unknown linkage!"); 905d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov } 9064ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else { 907d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // Copy the initializer over now... 908d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov DGVar->setInitializer(SInit); 9094ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } 9108d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } else { 911d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // Destination is alias, the only valid situation is when source is 912d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // weak. Also, note, that we already checked linkage in LinkGlobals(), 913d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // thus we assert here. 914d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // FIXME: Should we weaken this assumption, 'dereference' alias and 915d13726f1e91218bc3f7103adf6cd98676bc477e2Anton Korobeynikov // check for initializer of aliasee? 916a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands assert(SGV->isWeakForLinker()); 9178d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 9188d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 9198d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 9208d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return false; 9218d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner} 9225c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 92379df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner// LinkFunctionProtos - Link the functions together between the two modules, 924c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// without doing function bodies... this just adds external function prototypes 925c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// to the Dest function... 9265c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 92779df7c0aaa18129e55968c8783ef8346807bd4afChris Lattnerstatic bool LinkFunctionProtos(Module *Dest, const Module *Src, 9285c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 9295c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 930d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner ValueSymbolTable &DestSymTab = Dest->getValueSymbolTable(); 931c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson LLVMContext &Context = Dest->getContext(); 932eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 933619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer // Loop over all of the functions in the src module, mapping them over 9345c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner for (Module::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) { 93518961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const Function *SF = I; // SrcFunction 936194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov GlobalValue *DGV = 0; 937eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 938d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // Check to see if may have to link the function with the global, alias or 939d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // function. 940bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (SF->hasName() && !SF->hasLocalLinkage()) 941d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner DGV = cast_or_null<GlobalValue>(DestSymTab.lookup(SF->getNameStart(), 942d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner SF->getNameEnd())); 943eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 944ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner // If we found a global with the same name in the dest module, but it has 945ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner // internal linkage, we are really not doing any linkage here. 946bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (DGV && DGV->hasLocalLinkage()) 947ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner DGV = 0; 948ae1132d2b8ae07afd2fe9a7cb434d849f884bfa0Chris Lattner 949d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner // If types don't agree due to opaque types, try to resolve them. 950d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner if (DGV && DGV->getType() != SF->getType()) 951d1ec48c641f76d4c0e5b7cb357a1333d4fb75c4aChris Lattner RecursiveResolveTypes(SF->getType(), DGV->getType()); 952194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov 9536157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner GlobalValue::LinkageTypes NewLinkage = GlobalValue::InternalLinkage; 9546157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner bool LinkFromSrc = false; 9556157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (GetLinkageResult(DGV, SF, NewLinkage, LinkFromSrc, Err)) 9566157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner return true; 957eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 958824684982968244050e56357e736b9940c23e77dChris Lattner // If there is no linkage to be performed, just bring over SF without 959824684982968244050e56357e736b9940c23e77dChris Lattner // modifying it. 960194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov if (DGV == 0) { 961824684982968244050e56357e736b9940c23e77dChris Lattner // Function does not already exist, simply insert an function signature 962824684982968244050e56357e736b9940c23e77dChris Lattner // identical to SF into the dest module. 963824684982968244050e56357e736b9940c23e77dChris Lattner Function *NewDF = Function::Create(SF->getFunctionType(), 964824684982968244050e56357e736b9940c23e77dChris Lattner SF->getLinkage(), 965824684982968244050e56357e736b9940c23e77dChris Lattner SF->getName(), Dest); 966824684982968244050e56357e736b9940c23e77dChris Lattner CopyGVAttributes(NewDF, SF); 967eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 968824684982968244050e56357e736b9940c23e77dChris Lattner // If the LLVM runtime renamed the function, but it is an externally 969824684982968244050e56357e736b9940c23e77dChris Lattner // visible symbol, DF must be an existing function with internal linkage. 970824684982968244050e56357e736b9940c23e77dChris Lattner // Rename it. 971bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (!NewDF->hasLocalLinkage() && NewDF->getName() != SF->getName()) 972824684982968244050e56357e736b9940c23e77dChris Lattner ForceRenaming(NewDF, SF->getName()); 973eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 974824684982968244050e56357e736b9940c23e77dChris Lattner // ... and remember this mapping... 975824684982968244050e56357e736b9940c23e77dChris Lattner ValueMap[SF] = NewDF; 976824684982968244050e56357e736b9940c23e77dChris Lattner continue; 97797f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner } 978eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 9796157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // If the visibilities of the symbols disagree and the destination is a 9806157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // prototype, take the visibility of its input. 9816157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (DGV->isDeclaration()) 9826157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner DGV->setVisibility(SF->getVisibility()); 983eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 9846157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (LinkFromSrc) { 9856157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (isa<GlobalAlias>(DGV)) 9866157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner return Error(Err, "Function-Alias Collision on '" + SF->getName() + 9876157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner "': symbol multiple defined"); 988eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 9896157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // We have a definition of the same name but different type in the 9906157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // source module. Copy the prototype to the destination and replace 9916157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // uses of the destination's prototype with the new prototype. 9926157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner Function *NewDF = Function::Create(SF->getFunctionType(), NewLinkage, 9936157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner SF->getName(), Dest); 9946157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner CopyGVAttributes(NewDF, SF); 995eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 9966157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Any uses of DF need to change to NewDF, with cast 997c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson DGV->replaceAllUsesWith(Context.getConstantExprBitCast(NewDF, 998c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson DGV->getType())); 999eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 10006157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // DF will conflict with NewDF because they both had the same. We must 10016157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // erase this now so ForceRenaming doesn't assert because DF might 1002eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov // not have internal linkage. 10036157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (GlobalVariable *Var = dyn_cast<GlobalVariable>(DGV)) 10046157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner Var->eraseFromParent(); 10056157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner else 10066157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner cast<Function>(DGV)->eraseFromParent(); 1007eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 10086157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // If the symbol table renamed the function, but it is an externally 1009eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov // visible symbol, DF must be an existing function with internal 10106157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // linkage. Rename it. 1011bb46f52027416598a662dc1c58f48d9d56b1a65bRafael Espindola if (NewDF->getName() != SF->getName() && !NewDF->hasLocalLinkage()) 10126157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner ForceRenaming(NewDF, SF->getName()); 1013eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 10146157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Remember this mapping so uses in the source module get remapped 10156157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // later by RemapOperand. 10166157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner ValueMap[SF] = NewDF; 1017822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner continue; 1018822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner } 1019eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 10206157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Not "link from source", keep the one in the DestModule and remap the 10216157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // input onto it. 1022eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 10236157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner if (isa<GlobalAlias>(DGV)) { 10246157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // The only valid mappings are: 10256157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // - SF is external declaration, which is effectively a no-op. 10266157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // - SF is weak, when we just need to throw SF out. 1027a05ef5e107943478ad02bc0cd5170a3894076bc4Duncan Sands if (!SF->isDeclaration() && !SF->isWeakForLinker()) 10286157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner return Error(Err, "Function-Alias Collision on '" + SF->getName() + 10296157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner "': symbol multiple defined"); 1030822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner } 10316157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 10326157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Set calculated linkage 10336157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner DGV->setLinkage(NewLinkage); 10346157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner 10356157e383c4a15ffb6e7f27cdb153daa9caa15ca5Chris Lattner // Make sure to remember this mapping. 1036c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson ValueMap[SF] = Context.getConstantExprBitCast(DGV, SF->getType()); 10375c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 10385c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 10395c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 10405c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 1041c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBody - Copy the source function over into the dest function and 1042c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// fix up references to values. At this point we know that Dest is an external 1043c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function, and that Src is not. 10444bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattnerstatic bool LinkFunctionBody(Function *Dest, Function *Src, 1045ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer std::map<const Value*, Value*> &ValueMap, 10465c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 10475cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer assert(Src && Dest && Dest->isDeclaration() && !Src->isDeclaration()); 10485c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10490033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner // Go through and convert function arguments over, remembering the mapping. 1050e4d5c441e04bdc00ccf1804744af670655123b07Chris Lattner Function::arg_iterator DI = Dest->arg_begin(); 1051e4d5c441e04bdc00ccf1804744af670655123b07Chris Lattner for (Function::arg_iterator I = Src->arg_begin(), E = Src->arg_end(); 105269da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner I != E; ++I, ++DI) { 10536bc41e8a74d1756da0003641bfebd02a3d6d9586Owen Anderson DI->setName(I->getName()); // Copy the name information over... 10545c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10555c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Add a mapping to our local map 1056817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[I] = DI; 10575c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 10585c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10594bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner // Splice the body of the source function into the dest function. 10604bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner Dest->getBasicBlockList().splice(Dest->end(), Src->getBasicBlockList()); 10615c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 1062c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // At this point, all of the instructions and values of the function are now 1063c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // copied over. The only problem is that they are still referencing values in 1064c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // the Source function as operands. Loop through all of the operands of the 1065c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // functions and patch them up to point to the local versions... 10665c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 106718961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Function::iterator BB = Dest->begin(), BE = Dest->end(); BB != BE; ++BB) 106818961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) 106918961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Instruction::op_iterator OI = I->op_begin(), OE = I->op_end(); 1070221d688a5ef21a22c2368c9fff0e92d7966c95e5Chris Lattner OI != OE; ++OI) 10714bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner if (!isa<Instruction>(*OI) && !isa<BasicBlock>(*OI)) 1072c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson *OI = RemapOperand(*OI, ValueMap, *Dest->getContext()); 10730033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner 10740033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner // There is no need to map the arguments anymore. 10751127315562b221010040925980040fd4f65bdb1cChris Lattner for (Function::arg_iterator I = Src->arg_begin(), E = Src->arg_end(); 10761127315562b221010040925980040fd4f65bdb1cChris Lattner I != E; ++I) 1077ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ValueMap.erase(I); 10785c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10795c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 10805c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 10815c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10825c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 1083c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBodies - Link in the function bodies that are defined in the 1084c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// source module into the DestModule. This consists basically of copying the 1085c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function over and fixing up references to values. 10864bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattnerstatic bool LinkFunctionBodies(Module *Dest, Module *Src, 10875c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 10885c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 10895c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10908bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer // Loop over all of the functions in the src module, mapping them over as we 10918bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer // go 10924bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner for (Module::iterator SF = Src->begin(), E = Src->end(); SF != E; ++SF) { 1093619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer if (!SF->isDeclaration()) { // No body if function is external 1094ec91ccba3ca92d5e1f19fb0cb6e57a7d4a3f3195Chris Lattner Function *DF = dyn_cast<Function>(ValueMap[SF]); // Destination function 1095c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner 109618961504fc2b299578dba817900a0696cf3ccc4dChris Lattner // DF not external SF external? 1097ec91ccba3ca92d5e1f19fb0cb6e57a7d4a3f3195Chris Lattner if (DF && DF->isDeclaration()) 109835956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner // Only provide the function body if there isn't one already. 109935956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner if (LinkFunctionBody(DF, SF, ValueMap, Err)) 110035956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner return true; 1101c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner } 11025c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 11035c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 11045c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 11055c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 11068166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// LinkAppendingVars - If there were any appending global variables, link them 11078166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// together now. Return true on error. 11088166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattnerstatic bool LinkAppendingVars(Module *M, 11098166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 11108166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::string *ErrorMsg) { 11118166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (AppendingVars.empty()) return false; // Nothing to do. 1112f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 1113c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson LLVMContext &Context = M->getContext(); 1114c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson 11158166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Loop over the multimap of appending vars, processing any variables with the 11168166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // same name, forming a new appending global variable with both of the 11178166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers merged together, then rewrite references to the old variables 11188166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // and delete them. 11198166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::vector<Constant*> Inits; 11208166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner while (AppendingVars.size() > 1) { 11218166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Get the first two elements in the map... 11228166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, 11238166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable*>::iterator Second = AppendingVars.begin(), First=Second++; 11248166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11258166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If the first two elements are for different names, there is no pair... 11268166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Otherwise there is a pair, so link them together... 11278166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (First->first == Second->first) { 11288166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *G1 = First->second, *G2 = Second->second; 11298166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T1 = cast<ArrayType>(G1->getType()->getElementType()); 11308166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T2 = cast<ArrayType>(G2->getType()->getElementType()); 1131f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 11328166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Check to see that they two arrays agree on type... 11338166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (T1->getElementType() != T2->getElementType()) 11348166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 11358166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables with different element types need to be linked!"); 11368166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (G1->isConstant() != G2->isConstant()) 11378166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 11388166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables linked with different const'ness!"); 11398166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11409613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio if (G1->getAlignment() != G2->getAlignment()) 11419613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio return Error(ErrorMsg, 11429613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio "Appending variables with different alignment need to be linked!"); 11439613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio 11449613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio if (G1->getVisibility() != G2->getVisibility()) 11459613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio return Error(ErrorMsg, 11469613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio "Appending variables with different visibility need to be linked!"); 11479613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio 11489613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio if (G1->getSection() != G2->getSection()) 11499613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio return Error(ErrorMsg, 11509613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio "Appending variables with different section name need to be linked!"); 1151eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 11528166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner unsigned NewSize = T1->getNumElements() + T2->getNumElements(); 1153c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson ArrayType *NewType = Context.getArrayType(T1->getElementType(), 1154c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson NewSize); 11558166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 1156ed74a4ef3b813bed0c0f4bb5af42229d50133da2Chris Lattner G1->setName(""); // Clear G1's name in case of a conflict! 1157eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 11588166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Create the new global variable... 11598166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NG = 1160e9b11b431308f4766b73cda93e38ec930c912122Owen Anderson new GlobalVariable(*M, NewType, G1->isConstant(), G1->getLinkage(), 1161e9b11b431308f4766b73cda93e38ec930c912122Owen Anderson /*init*/0, First->first, 0, G1->isThreadLocal(), 1162a534b0f7bf0248bf90afe97110a34777e972f325Chris Lattner G1->getType()->getAddressSpace()); 11638166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11649613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio // Propagate alignment, visibility and section info. 11659613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio CopyGVAttributes(NG, G1); 11669613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio 11678166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Merge the initializer... 11688166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.reserve(NewSize); 1169de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if (ConstantArray *I = dyn_cast<ConstantArray>(G1->getInitializer())) { 1170de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i) 1171cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos Inits.push_back(I->getOperand(i)); 1172de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } else { 1173de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner assert(isa<ConstantAggregateZero>(G1->getInitializer())); 1174c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson Constant *CV = Context.getNullValue(T1->getElementType()); 1175de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i) 1176de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(CV); 1177de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } 1178de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if (ConstantArray *I = dyn_cast<ConstantArray>(G2->getInitializer())) { 1179de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i) 1180cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos Inits.push_back(I->getOperand(i)); 1181de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } else { 1182de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner assert(isa<ConstantAggregateZero>(G2->getInitializer())); 1183c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson Constant *CV = Context.getNullValue(T2->getElementType()); 1184de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i) 1185de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(CV); 1186de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } 1187c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson NG->setInitializer(Context.getConstantArray(NewType, Inits)); 11888166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.clear(); 11898166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11908166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Replace any uses of the two global variables with uses of the new 11918166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // global... 11928166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11938166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // FIXME: This should rewrite simple/straight-forward uses such as 11948166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // getelementptr instructions to not use the Cast! 1195c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson G1->replaceAllUsesWith(Context.getConstantExprBitCast(NG, 1196c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson G1->getType())); 1197c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson G2->replaceAllUsesWith(Context.getConstantExprBitCast(NG, 1198c9ab7bf98f6a0261220e4b2380db2df8ee29829bOwen Anderson G2->getType())); 11998166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 12008166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Remove the two globals from the module now... 12018166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G1); 12028166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G2); 12038166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 12048166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Put the new global into the AppendingVars map so that we can handle 12058166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // linking of more than two vars... 12068166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Second->second = NG; 12078166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 12088166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.erase(First); 12098166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 12108166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 12118166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return false; 12128166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner} 121352f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 12149f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikovstatic bool ResolveAliases(Module *Dest) { 12159f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikov for (Module::alias_iterator I = Dest->alias_begin(), E = Dest->alias_end(); 12165241957b1f6876452705f94e0ed60dd2c33a5c84Anton Korobeynikov I != E; ++I) 121719e861a4ffb896f16a691d5ac869e894df3cd464Anton Korobeynikov if (const GlobalValue *GV = I->resolveAliasedGlobal()) 1218832b2a9cd8870211bf2d347d7b435beacbb06c8dAnton Korobeynikov if (GV != I && !GV->isDeclaration()) 12195241957b1f6876452705f94e0ed60dd2c33a5c84Anton Korobeynikov I->replaceAllUsesWith(const_cast<GlobalValue*>(GV)); 12209f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikov 12219f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikov return false; 12229f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikov} 122352f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 122452f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// LinkModules - This function links two modules together, with the resulting 122552f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// left module modified to be the composite of the two input modules. If an 122652f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// error occurs, true is returned and ErrorMsg (if not null) is set to indicate 12275c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// the problem. Upon failure, the Dest module could be in a modified state, and 12285c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// shouldn't be relied on to be consistent. 1229f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukmanbool 12300ba9e211bed7813949aaca97e6b15579c8188e05Reid SpencerLinker::LinkModules(Module *Dest, Module *Src, std::string *ErrorMsg) { 123157a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer assert(Dest != 0 && "Invalid Destination module"); 123257a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer assert(Src != 0 && "Invalid Source Module"); 123357a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 1234c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Dest->getDataLayout().empty()) { 1235c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (!Src->getDataLayout().empty()) { 1236ec9bfdc152a870d3c62377ed6855fb3bff69511cChris Lattner Dest->setDataLayout(Src->getDataLayout()); 1237c36357c406911ded5a0e2924998d885815370fdbChris Lattner } else { 1238c36357c406911ded5a0e2924998d885815370fdbChris Lattner std::string DataLayout; 1239c36357c406911ded5a0e2924998d885815370fdbChris Lattner 1240a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov if (Dest->getEndianness() == Module::AnyEndianness) { 1241c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Src->getEndianness() == Module::BigEndian) 1242c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append("E"); 1243c36357c406911ded5a0e2924998d885815370fdbChris Lattner else if (Src->getEndianness() == Module::LittleEndian) 1244c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append("e"); 1245a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov } 1246a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov 1247a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov if (Dest->getPointerSize() == Module::AnyPointerSize) { 1248c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Src->getPointerSize() == Module::Pointer64) 1249c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append(DataLayout.length() == 0 ? "p:64:64" : "-p:64:64"); 1250c36357c406911ded5a0e2924998d885815370fdbChris Lattner else if (Src->getPointerSize() == Module::Pointer32) 1251c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append(DataLayout.length() == 0 ? "p:32:32" : "-p:32:32"); 1252a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov } 1253c36357c406911ded5a0e2924998d885815370fdbChris Lattner Dest->setDataLayout(DataLayout); 1254c36357c406911ded5a0e2924998d885815370fdbChris Lattner } 1255c36357c406911ded5a0e2924998d885815370fdbChris Lattner } 1256873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner 1257f27dfcb210fec571d79bc881f5463e0b405707c0Chris Lattner // Copy the target triple from the source to dest if the dest's is empty. 1258c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Dest->getTargetTriple().empty() && !Src->getTargetTriple().empty()) 1259c36357c406911ded5a0e2924998d885815370fdbChris Lattner Dest->setTargetTriple(Src->getTargetTriple()); 1260eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 1261c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (!Src->getDataLayout().empty() && !Dest->getDataLayout().empty() && 1262c36357c406911ded5a0e2924998d885815370fdbChris Lattner Src->getDataLayout() != Dest->getDataLayout()) 126326f238589f9bb372d24b6fb2bc32edbf046fd9eeReid Spencer cerr << "WARNING: Linking two modules of different data layouts!\n"; 1264152f19ac6514ec29e183ddcdf2ea71599638dc4cChris Lattner if (!Src->getTargetTriple().empty() && 1265152f19ac6514ec29e183ddcdf2ea71599638dc4cChris Lattner Dest->getTargetTriple() != Src->getTargetTriple()) 1266e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << "WARNING: Linking two modules of different target triples!\n"; 1267f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 1268f27dfcb210fec571d79bc881f5463e0b405707c0Chris Lattner // Append the module inline asm string. 12696631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner if (!Src->getModuleInlineAsm().empty()) { 12706631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner if (Dest->getModuleInlineAsm().empty()) 12716631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner Dest->setModuleInlineAsm(Src->getModuleInlineAsm()); 1272e1b2e14f92e8e9da1eb4854511a881cf9c22af3cChris Lattner else 12736631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner Dest->setModuleInlineAsm(Dest->getModuleInlineAsm()+"\n"+ 12746631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner Src->getModuleInlineAsm()); 1275e1b2e14f92e8e9da1eb4854511a881cf9c22af3cChris Lattner } 1276eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov 1277719012d6254ee425464f034250176283fb96793bReid Spencer // Update the destination module's dependent libraries list with the libraries 127857a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // from the source module. There's no opportunity for duplicates here as the 127957a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // Module ensures that duplicate insertions are discarded. 1280f27dfcb210fec571d79bc881f5463e0b405707c0Chris Lattner for (Module::lib_iterator SI = Src->lib_begin(), SE = Src->lib_end(); 1281eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov SI != SE; ++SI) 128257a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer Dest->addLibrary(*SI); 128357a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 12842c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // LinkTypes - Go through the symbol table of the Src module and see if any 12852c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // types are named in the src module that are not named in the Dst module. 12862c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Make sure there are no type name conflicts. 1287eba2cb0d5aef5a8229facae5624c65d9fd65e9d1Mikhail Glushenkov if (LinkTypes(Dest, Src, ErrorMsg)) 1288619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer return true; 12892c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 12905c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // ValueMap - Mapping of values from what they used to be in Src, to what they 12915c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // are now in Dest. 12925c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> ValueMap; 12935c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 12948166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars - Keep track of global variables in the destination module 12958166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // with appending linkage. After the module is linked together, they are 12968166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // appended and the module is rewritten. 12978166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> AppendingVars; 12981127315562b221010040925980040fd4f65bdb1cChris Lattner for (Module::global_iterator I = Dest->global_begin(), E = Dest->global_end(); 12991127315562b221010040925980040fd4f65bdb1cChris Lattner I != E; ++I) { 13005a837defff581accc09048bea1cd839009e374a7Chris Lattner // Add all of the appending globals already in the Dest module to 13015a837defff581accc09048bea1cd839009e374a7Chris Lattner // AppendingVars. 1302f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner if (I->hasAppendingLinkage()) 1303f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner AppendingVars.insert(std::make_pair(I->getName(), I)); 13045a837defff581accc09048bea1cd839009e374a7Chris Lattner } 13055a837defff581accc09048bea1cd839009e374a7Chris Lattner 13068166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Insert all of the globals in src into the Dest module... without linking 13078166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers (which could refer to functions not yet mapped over). 1308ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (LinkGlobals(Dest, Src, ValueMap, AppendingVars, ErrorMsg)) 13095a837defff581accc09048bea1cd839009e374a7Chris Lattner return true; 13105c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 1311c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link the functions together between the two modules, without doing function 1312c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // bodies... this just adds external function prototypes to the Dest 1313c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // function... We do this so that when we begin processing function bodies, 1314c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // all of the global values that may be referenced are available in our 1315c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // ValueMap. 1316ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (LinkFunctionProtos(Dest, Src, ValueMap, ErrorMsg)) 13175a837defff581accc09048bea1cd839009e374a7Chris Lattner return true; 13185c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 13194fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov // If there were any alias, link them now. We really need to do this now, 13204fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov // because all of the aliases that may be referenced need to be available in 13214fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov // ValueMap 13224fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov if (LinkAlias(Dest, Src, ValueMap, ErrorMsg)) return true; 13234fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov 13246cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // Update the initializers in the Dest module now that all globals that may 13256cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // be referenced are in Dest. 13266cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner if (LinkGlobalInits(Dest, Src, ValueMap, ErrorMsg)) return true; 13276cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner 1328c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link in the function bodies that are defined in the source module into the 1329c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // DestModule. This consists basically of copying the function over and 1330c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // fixing up references to values. 133179df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner if (LinkFunctionBodies(Dest, Src, ValueMap, ErrorMsg)) return true; 133252f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 13338166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If there were any appending global variables, link them together now. 13348166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (LinkAppendingVars(Dest, AppendingVars, ErrorMsg)) return true; 13358166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 13363db9191baf5f5229a2f4d204c6332ba27fff81d0Anton Korobeynikov // Resolve all uses of aliases with aliasees 13373db9191baf5f5229a2f4d204c6332ba27fff81d0Anton Korobeynikov if (ResolveAliases(Dest)) return true; 13383db9191baf5f5229a2f4d204c6332ba27fff81d0Anton Korobeynikov 133957a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // If the source library's module id is in the dependent library list of the 134057a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // destination library, remove it since that module is now linked in. 134157a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer sys::Path modId; 1342dd04df0ec33a903ee7fc747701bafde622f77d8bReid Spencer modId.set(Src->getModuleIdentifier()); 134307adb2836b8aa7a3872e33c285958f5937662b50Reid Spencer if (!modId.isEmpty()) 134407adb2836b8aa7a3872e33c285958f5937662b50Reid Spencer Dest->removeLibrary(modId.getBasename()); 134557a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 134652f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner return false; 134752f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner} 13489466f5113ba859677a28887c3c7143065e702019Vikram S. Adve 1349567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer// vim: sw=2 1350