LinkModules.cpp revision 0bb8757997392ee18ca9de0f1fab29463f8e7aeb
17f49602e5ac7186c9505a0496393dd624515b459Reid Spencer//===- lib/Linker/LinkModules.cpp - Module Linker Implementation ----------===// 2f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman// 3b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// The LLVM Compiler Infrastructure 4b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// 54ee451de366474b9c228b4e5fa573795a715216dChris Lattner// This file is distributed under the University of Illinois Open Source 64ee451de366474b9c228b4e5fa573795a715216dChris Lattner// License. See LICENSE.TXT for details. 7f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman// 8b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell//===----------------------------------------------------------------------===// 952f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// 1052f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// This file implements the LLVM module linker. 1152f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// 1252f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// Specifically, this: 138d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// * Merges global variables between the two modules 148d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// * Uninit + Uninit = Init, Init + Uninit = Init, Init + Init = Error if != 15c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// * Merges functions between two modules 1652f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// 1752f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner//===----------------------------------------------------------------------===// 1852f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 197cc371a7958c7a049c679a59023c3c8c83f6cc83Reid Spencer#include "llvm/Linker.h" 20adbc0b5287bf36893cdcae2440d48b3cb3489e38Chris Lattner#include "llvm/Constants.h" 21adbc0b5287bf36893cdcae2440d48b3cb3489e38Chris Lattner#include "llvm/DerivedTypes.h" 225c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner#include "llvm/Module.h" 2378d033e086e19e016273de014f9214aa6f3f844bReid Spencer#include "llvm/TypeSymbolTable.h" 24ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer#include "llvm/ValueSymbolTable.h" 2547b14a4a6a455c7be169cfd312fcbe796f0ad426Misha Brukman#include "llvm/Instructions.h" 26adbc0b5287bf36893cdcae2440d48b3cb3489e38Chris Lattner#include "llvm/Assembly/Writer.h" 2741edad7e4b8872414564dea5fb41fa6194375355Bill Wendling#include "llvm/Support/Streams.h" 2857a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer#include "llvm/System/Path.h" 2962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner#include "llvm/ADT/DenseMap.h" 301a097e30d39e60303ae2b19f7a56e813f3e3c18eBill Wendling#include <sstream> 31f7703df4968084c18c248c1feea9961c19a32e6aChris Lattnerusing namespace llvm; 32d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke 335c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// Error - Simple wrapper function to conditionally assign to E and return true. 345c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// This just makes error return conditions a little bit simpler... 358166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattnerstatic inline bool Error(std::string *E, const std::string &Message) { 365c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner if (E) *E = Message; 375c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return true; 385c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 395c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 40719012d6254ee425464f034250176283fb96793bReid Spencer// ToStr - Simple wrapper function to convert a type to a string. 4172cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattnerstatic std::string ToStr(const Type *Ty, const Module *M) { 4272cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattner std::ostringstream OS; 4372cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattner WriteTypeSymbolic(OS, Ty, M); 4472cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattner return OS.str(); 4572cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattner} 4672cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattner 47700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 48700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Function: ResolveTypes() 49700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 50700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Description: 51700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Attempt to link the two specified types together. 52700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 53700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Inputs: 54700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// DestTy - The type to which we wish to resolve. 55700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// SrcTy - The original type which we want to resolve. 56700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 57700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Outputs: 58700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// DestST - The symbol table in which the new type should be placed. 59700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 60700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Return value: 61700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// true - There is an error and the types cannot yet be linked. 62700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// false - No errors. 634c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner// 64bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattnerstatic bool ResolveTypes(const Type *DestTy, const Type *SrcTy) { 65e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DestTy == SrcTy) return false; // If already equal, noop 66bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner assert(DestTy && SrcTy && "Can't handle null types"); 67e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 68bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner if (const OpaqueType *OT = dyn_cast<OpaqueType>(DestTy)) { 69bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner // Type _is_ in module, just opaque... 70bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner const_cast<OpaqueType*>(OT)->refineAbstractTypeTo(SrcTy); 71bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner } else if (const OpaqueType *OT = dyn_cast<OpaqueType>(SrcTy)) { 72bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner const_cast<OpaqueType*>(OT)->refineAbstractTypeTo(DestTy); 73bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner } else { 74bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner return true; // Cannot link types... not-equal and neither is opaque. 754c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 764c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner return false; 774c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner} 784c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 7962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner/// LinkerTypeMap - This implements a map of types that is stable 8062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner/// even if types are resolved/refined to other types. This is not a general 8162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner/// purpose map, it is specific to the linker's use. 8262a81a1eba019ab570b002f8e1686494139785a1Chris Lattnernamespace { 8362a81a1eba019ab570b002f8e1686494139785a1Chris Lattnerclass LinkerTypeMap : public AbstractTypeUser { 8462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner typedef DenseMap<const Type*, PATypeHolder> TheMapTy; 8562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner TheMapTy TheMap; 8662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 87fc196f9ee909ac35837f6f771a42aa0dec817584Chris Lattner LinkerTypeMap(const LinkerTypeMap&); // DO NOT IMPLEMENT 88fc196f9ee909ac35837f6f771a42aa0dec817584Chris Lattner void operator=(const LinkerTypeMap&); // DO NOT IMPLEMENT 89fc196f9ee909ac35837f6f771a42aa0dec817584Chris Lattnerpublic: 90fc196f9ee909ac35837f6f771a42aa0dec817584Chris Lattner LinkerTypeMap() {} 91fc196f9ee909ac35837f6f771a42aa0dec817584Chris Lattner ~LinkerTypeMap() { 9262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner for (DenseMap<const Type*, PATypeHolder>::iterator I = TheMap.begin(), 9362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner E = TheMap.end(); I != E; ++I) 9462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner I->first->removeAbstractTypeUser(this); 9562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 9662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 9762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// lookup - Return the value for the specified type or null if it doesn't 9862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// exist. 9962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner const Type *lookup(const Type *Ty) const { 10062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner TheMapTy::const_iterator I = TheMap.find(Ty); 10162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (I != TheMap.end()) return I->second; 10262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return 0; 10362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 10462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 10562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// erase - Remove the specified type, returning true if it was in the set. 10662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner bool erase(const Type *Ty) { 10762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (!TheMap.erase(Ty)) 10862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return false; 10962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (Ty->isAbstract()) 11062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner Ty->removeAbstractTypeUser(this); 11162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return true; 11262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 11362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 11462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// insert - This returns true if the pointer was new to the set, false if it 11562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// was already in the set. 11662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner bool insert(const Type *Src, const Type *Dst) { 1176b345ee9b2833cf1b2f79dc16d06d4060bec36efDan Gohman if (!TheMap.insert(std::make_pair(Src, PATypeHolder(Dst))).second) 11862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return false; // Already in map. 11962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (Src->isAbstract()) 12062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner Src->addAbstractTypeUser(this); 12162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return true; 12262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 12362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 12462a81a1eba019ab570b002f8e1686494139785a1Chris Lattnerprotected: 12562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// refineAbstractType - The callback method invoked when an abstract type is 12662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// resolved to another type. An object must override this method to update 12762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// its internal state to reference NewType instead of OldType. 12862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// 12962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner virtual void refineAbstractType(const DerivedType *OldTy, 13062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner const Type *NewTy) { 13162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner TheMapTy::iterator I = TheMap.find(OldTy); 13262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner const Type *DstTy = I->second; 13362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 13462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner TheMap.erase(I); 13562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (OldTy->isAbstract()) 13662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner OldTy->removeAbstractTypeUser(this); 13762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 13862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner // Don't reinsert into the map if the key is concrete now. 13962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (NewTy->isAbstract()) 14062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner insert(NewTy, DstTy); 14162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 14262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 14362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// The other case which AbstractTypeUsers must be aware of is when a type 14462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// makes the transition from being abstract (where it has clients on it's 14562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// AbstractTypeUsers list) to concrete (where it does not). This method 14662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner /// notifies ATU's when this occurs for a type. 14762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner virtual void typeBecameConcrete(const DerivedType *AbsTy) { 14862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner TheMap.erase(AbsTy); 14962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner AbsTy->removeAbstractTypeUser(this); 15062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 15162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 15262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner // for debugging... 15362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner virtual void dump() const { 15462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner cerr << "AbstractTypeSet!\n"; 15562a81a1eba019ab570b002f8e1686494139785a1Chris Lattner } 15662a81a1eba019ab570b002f8e1686494139785a1Chris Lattner}; 15762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner} 15862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 15962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 160e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// RecursiveResolveTypes - This is just like ResolveTypes, except that it 161e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// recurses down into derived types, merging the used types if the parent types 162e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// are compatible. 163a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattnerstatic bool RecursiveResolveTypesI(const Type *DstTy, const Type *SrcTy, 16462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner LinkerTypeMap &Pointers) { 165a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (DstTy == SrcTy) return false; // If already equal, noop 166f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 167e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // If we found our opaque type, resolve it now! 168a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (isa<OpaqueType>(DstTy) || isa<OpaqueType>(SrcTy)) 169a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner return ResolveTypes(DstTy, SrcTy); 170f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 171e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Two types cannot be resolved together if they are of different primitive 172e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // type. For example, we cannot resolve an int to a float. 173a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (DstTy->getTypeID() != SrcTy->getTypeID()) return true; 174e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 17556539659eb1b192d493aa333b60213889129b9f1Chris Lattner // If neither type is abstract, then they really are just different types. 176a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (!DstTy->isAbstract() && !SrcTy->isAbstract()) 17756539659eb1b192d493aa333b60213889129b9f1Chris Lattner return true; 17856539659eb1b192d493aa333b60213889129b9f1Chris Lattner 179e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Otherwise, resolve the used type used by this derived type... 180a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner switch (DstTy->getTypeID()) { 181f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner default: 182f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner return true; 183e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::FunctionTyID: { 184a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const FunctionType *DstFT = cast<FunctionType>(DstTy); 185a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const FunctionType *SrcFT = cast<FunctionType>(SrcTy); 1869ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner if (DstFT->isVarArg() != SrcFT->isVarArg() || 1879ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner DstFT->getNumContainedTypes() != SrcFT->getNumContainedTypes()) 18843f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return true; 189a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner 190a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner // Use TypeHolder's so recursive resolution won't break us. 191a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner PATypeHolder ST(SrcFT), DT(DstFT); 192a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner for (unsigned i = 0, e = DstFT->getNumContainedTypes(); i != e; ++i) { 193a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const Type *SE = ST->getContainedType(i), *DE = DT->getContainedType(i); 194a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (SE != DE && RecursiveResolveTypesI(DE, SE, Pointers)) 195e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return true; 196a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner } 197e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return false; 198e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 199e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::StructTyID: { 200a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const StructType *DstST = cast<StructType>(DstTy); 201a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const StructType *SrcST = cast<StructType>(SrcTy); 2029ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner if (DstST->getNumContainedTypes() != SrcST->getNumContainedTypes()) 203f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner return true; 204a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner 205a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner PATypeHolder ST(SrcST), DT(DstST); 206a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner for (unsigned i = 0, e = DstST->getNumContainedTypes(); i != e; ++i) { 207a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const Type *SE = ST->getContainedType(i), *DE = DT->getContainedType(i); 208a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (SE != DE && RecursiveResolveTypesI(DE, SE, Pointers)) 209e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return true; 210a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner } 211e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return false; 212e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 213e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::ArrayTyID: { 214a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const ArrayType *DAT = cast<ArrayType>(DstTy); 215a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const ArrayType *SAT = cast<ArrayType>(SrcTy); 216e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DAT->getNumElements() != SAT->getNumElements()) return true; 217e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner return RecursiveResolveTypesI(DAT->getElementType(), SAT->getElementType(), 218bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner Pointers); 219e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner } 220f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner case Type::VectorTyID: { 221a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const VectorType *DVT = cast<VectorType>(DstTy); 222a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const VectorType *SVT = cast<VectorType>(SrcTy); 223f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner if (DVT->getNumElements() != SVT->getNumElements()) return true; 224f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner return RecursiveResolveTypesI(DVT->getElementType(), SVT->getElementType(), 225f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner Pointers); 226f6f4f7a149e2864cc0441afcbed5fd99ff4b9587Chris Lattner } 227e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner case Type::PointerTyID: { 228a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const PointerType *DstPT = cast<PointerType>(DstTy); 229a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner const PointerType *SrcPT = cast<PointerType>(SrcTy); 2309ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner 2319ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner if (DstPT->getAddressSpace() != SrcPT->getAddressSpace()) 2329ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner return true; 2339ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner 234e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // If this is a pointer type, check to see if we have already seen it. If 235e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // so, we are in a recursive branch. Cut off the search now. We cannot use 236e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // an associative container for this search, because the type pointers (keys 23762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner // in the container) change whenever types get resolved. 23862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (SrcPT->isAbstract()) 23962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (const Type *ExistingDestTy = Pointers.lookup(SrcPT)) 24062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return ExistingDestTy != DstPT; 24162a81a1eba019ab570b002f8e1686494139785a1Chris Lattner 24262a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (DstPT->isAbstract()) 24362a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (const Type *ExistingSrcTy = Pointers.lookup(DstPT)) 24462a81a1eba019ab570b002f8e1686494139785a1Chris Lattner return ExistingSrcTy != SrcPT; 245e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // Otherwise, add the current pointers to the vector to stop recursion on 246e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // this pair. 24762a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (DstPT->isAbstract()) 24862a81a1eba019ab570b002f8e1686494139785a1Chris Lattner Pointers.insert(DstPT, SrcPT); 24962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner if (SrcPT->isAbstract()) 25062a81a1eba019ab570b002f8e1686494139785a1Chris Lattner Pointers.insert(SrcPT, DstPT); 251a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner 2529ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner return RecursiveResolveTypesI(DstPT->getElementType(), 2539ddf2c898f5227ca137aef7abc3051e16bd60025Chris Lattner SrcPT->getElementType(), Pointers); 254e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 255f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman } 256e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner} 257e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 258a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattnerstatic bool RecursiveResolveTypes(const Type *DestTy, const Type *SrcTy) { 25962a81a1eba019ab570b002f8e1686494139785a1Chris Lattner LinkerTypeMap PointerTypes; 260bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner return RecursiveResolveTypesI(DestTy, SrcTy, PointerTypes); 261e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner} 262e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner 263e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 2642c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// LinkTypes - Go through the symbol table of the Src module and see if any 2652c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// types are named in the src module that are not named in the Dst module. 2662c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// Make sure there are no type name conflicts. 2675c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic bool LinkTypes(Module *Dest, const Module *Src, std::string *Err) { 26878d033e086e19e016273de014f9214aa6f3f844bReid Spencer TypeSymbolTable *DestST = &Dest->getTypeSymbolTable(); 26978d033e086e19e016273de014f9214aa6f3f844bReid Spencer const TypeSymbolTable *SrcST = &Src->getTypeSymbolTable(); 2702c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 2712c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Look for a type plane for Type's... 27278d033e086e19e016273de014f9214aa6f3f844bReid Spencer TypeSymbolTable::const_iterator TI = SrcST->begin(); 27378d033e086e19e016273de014f9214aa6f3f844bReid Spencer TypeSymbolTable::const_iterator TE = SrcST->end(); 274567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer if (TI == TE) return false; // No named types, do nothing. 2752c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 276cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // Some types cannot be resolved immediately because they depend on other 277cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // types being resolved to each other first. This contains a list of types we 278cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // are waiting to recheck. 2794c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner std::vector<std::string> DelayedTypesToResolve; 2804c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 281567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer for ( ; TI != TE; ++TI ) { 282567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer const std::string &Name = TI->first; 283c28a224c68adf0464c275778af4bce762ad25d37Reid Spencer const Type *RHS = TI->second; 2842c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 285bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner // Check to see if this type name is already in the dest module. 28678d033e086e19e016273de014f9214aa6f3f844bReid Spencer Type *Entry = DestST->lookup(Name); 2874c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 288bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner // If the name is just in the source module, bring it over to the dest. 289bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner if (Entry == 0) { 290bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner if (!Name.empty()) 291bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner DestST->insert(Name, const_cast<Type*>(RHS)); 292bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner } else if (ResolveTypes(Entry, RHS)) { 2934c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // They look different, save the types 'till later to resolve. 2944c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner DelayedTypesToResolve.push_back(Name); 2954c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 2964c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 2974c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 2984c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Iteratively resolve types while we can... 2994c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner while (!DelayedTypesToResolve.empty()) { 3004c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Loop over all of the types, attempting to resolve them if possible... 3014c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner unsigned OldSize = DelayedTypesToResolve.size(); 3024c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 303e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Try direct resolution by name... 3044c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner for (unsigned i = 0; i != DelayedTypesToResolve.size(); ++i) { 3054c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner const std::string &Name = DelayedTypesToResolve[i]; 30678d033e086e19e016273de014f9214aa6f3f844bReid Spencer Type *T1 = SrcST->lookup(Name); 30778d033e086e19e016273de014f9214aa6f3f844bReid Spencer Type *T2 = DestST->lookup(Name); 308bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner if (!ResolveTypes(T2, T1)) { 3094c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // We are making progress! 3104c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i); 3114c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner --i; 3122f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner } 3134c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 3142f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner 3154c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Did we not eliminate any types? 3164c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (DelayedTypesToResolve.size() == OldSize) { 317e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Attempt to resolve subelements of types. This allows us to merge these 318e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // two types: { int* } and { opaque* } 3194c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner for (unsigned i = 0, e = DelayedTypesToResolve.size(); i != e; ++i) { 3204c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner const std::string &Name = DelayedTypesToResolve[i]; 321a4477f9b31ce0b6fadc5365ff9355679c1ecb954Chris Lattner if (!RecursiveResolveTypes(SrcST->lookup(Name), DestST->lookup(Name))) { 322e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // We are making progress! 323e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i); 324f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 325e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Go back to the main loop, perhaps we can resolve directly by name 326e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // now... 327e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner break; 328e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 329e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 330e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 331e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // If we STILL cannot resolve the types, then there is something wrong. 332e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DelayedTypesToResolve.size() == OldSize) { 333aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner // Remove the symbol name from the destination. 334aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner DelayedTypesToResolve.pop_back(); 3354c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 3362c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner } 3372c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner } 3384c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 3394c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 3402c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner return false; 3412c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner} 3422c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 3430bb8757997392ee18ca9de0f1fab29463f8e7aebChris Lattner#ifndef NDEBUG 3445c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic void PrintMap(const std::map<const Value*, Value*> &M) { 3455c2d335d86579941b71816196a95a64b277e8963Chris Lattner for (std::map<const Value*, Value*>::const_iterator I = M.begin(), E =M.end(); 3462d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner I != E; ++I) { 347e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << " Fr: " << (void*)I->first << " "; 34887182ae6baf28ca6da6ee4bc00cf1857f293acfeChris Lattner I->first->dump(); 349e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << " To: " << (void*)I->second << " "; 35087182ae6baf28ca6da6ee4bc00cf1857f293acfeChris Lattner I->second->dump(); 351e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << "\n"; 3522d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner } 3532d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner} 3540bb8757997392ee18ca9de0f1fab29463f8e7aebChris Lattner#endif 3552d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 3562d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 357619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer// RemapOperand - Use ValueMap to convert constants from one module to another. 3585c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic Value *RemapOperand(const Value *In, 3590033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner std::map<const Value*, Value*> &ValueMap) { 3600033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner std::map<const Value*,Value*>::const_iterator I = ValueMap.find(In); 361ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (I != ValueMap.end()) 362ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer return I->second; 3635c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 364619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer // Check to see if it's a constant that we are interested in transforming. 365620fd68b1086b4d99b23951357299bee357aa62aChris Lattner Value *Result = 0; 36618961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (const Constant *CPV = dyn_cast<Constant>(In)) { 367de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if ((!isa<DerivedType>(CPV->getType()) && !isa<ConstantExpr>(CPV)) || 368a54b7cbd452b3adb2f51346140d996b29c2cdb30Reid Spencer isa<ConstantInt>(CPV) || isa<ConstantAggregateZero>(CPV)) 3690033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner return const_cast<Constant*>(CPV); // Simple constants stay identical. 3708d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 37118961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (const ConstantArray *CPA = dyn_cast<ConstantArray>(CPV)) { 372cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos std::vector<Constant*> Operands(CPA->getNumOperands()); 373cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i) 3740033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner Operands[i] =cast<Constant>(RemapOperand(CPA->getOperand(i), ValueMap)); 375e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Result = ConstantArray::get(cast<ArrayType>(CPA->getType()), Operands); 37618961504fc2b299578dba817900a0696cf3ccc4dChris Lattner } else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(CPV)) { 377cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos std::vector<Constant*> Operands(CPS->getNumOperands()); 378cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i) 3790033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner Operands[i] =cast<Constant>(RemapOperand(CPS->getOperand(i), ValueMap)); 380e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Result = ConstantStruct::get(cast<StructType>(CPS->getType()), Operands); 381b976e668165e1875a8f1eb7af800e33bb1e4393dChris Lattner } else if (isa<ConstantPointerNull>(CPV) || isa<UndefValue>(CPV)) { 38218961504fc2b299578dba817900a0696cf3ccc4dChris Lattner Result = const_cast<Constant*>(CPV); 3839d6565a5b1fbc4286d6ee638d8f47a3171a9ed7eReid Spencer } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CPV)) { 384a88eb9287eb14ba62ca6324b2b249e0ae9fe3309Chris Lattner std::vector<Constant*> Operands(CP->getNumOperands()); 385a88eb9287eb14ba62ca6324b2b249e0ae9fe3309Chris Lattner for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i) 386a88eb9287eb14ba62ca6324b2b249e0ae9fe3309Chris Lattner Operands[i] = cast<Constant>(RemapOperand(CP->getOperand(i), ValueMap)); 3879d6565a5b1fbc4286d6ee638d8f47a3171a9ed7eReid Spencer Result = ConstantVector::get(Operands); 3886cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) { 38927d672136a57519095a3ef20161697749cffb57cChris Lattner std::vector<Constant*> Ops; 39027d672136a57519095a3ef20161697749cffb57cChris Lattner for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) 39127d672136a57519095a3ef20161697749cffb57cChris Lattner Ops.push_back(cast<Constant>(RemapOperand(CE->getOperand(i),ValueMap))); 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 } 400620fd68b1086b4d99b23951357299bee357aa62aChris Lattner 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 } 4068bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer 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))) { 426ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer assert(ConflictGV->hasInternalLinkage() && 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 437ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer/// 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) { 455aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner assert((!Dest || !Src->hasInternalLinkage()) && 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(); 469b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } 4708753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth } else if (Dest->hasExternalWeakLinkage()) { 4718753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth //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(); 48880585f1daac3570f19cd255c5006dfcf2ff65a89Anton Korobeynikov } else if (Src->isWeakForLinker()) { 489aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen // At this point we know that Dest has LinkOnce, External*, Weak, Common, 490aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen // or DLL* linkage. 49180585f1daac3570f19cd255c5006dfcf2ff65a89Anton Korobeynikov if ((Dest->hasLinkOnceLinkage() && 492aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen (Src->hasWeakLinkage() || Src->hasCommonLinkage())) || 49378ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Dest->hasExternalWeakLinkage()) { 494aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 495aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 496aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else { 497aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = false; 498aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Dest->getLinkage(); 499aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 50080585f1daac3570f19cd255c5006dfcf2ff65a89Anton Korobeynikov } else if (Dest->isWeakForLinker()) { 50178ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // At this point we know that Src has External* or DLL* linkage. 50278ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov if (Src->hasExternalWeakLinkage()) { 50378ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LinkFromSrc = false; 50478ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LT = Dest->getLinkage(); 50578ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov } else { 50678ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LinkFromSrc = true; 50778ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LT = GlobalValue::ExternalLinkage; 50878ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov } 509aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else { 510b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov assert((Dest->hasExternalLinkage() || 511b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov Dest->hasDLLImportLinkage() || 51278ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Dest->hasDLLExportLinkage() || 51378ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Dest->hasExternalWeakLinkage()) && 514b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov (Src->hasExternalLinkage() || 515b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov Src->hasDLLImportLinkage() || 51678ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Src->hasDLLExportLinkage() || 51778ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Src->hasExternalWeakLinkage()) && 518aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "Unexpected linkage type!"); 519f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman return Error(Err, "Linking globals named '" + Src->getName() + 520aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "': symbol multiply defined!"); 521aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 5229cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov 5239cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov // Check visibility 5249cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov if (Dest && Src->getVisibility() != Dest->getVisibility()) 52597f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner if (!Src->isDeclaration() && !Dest->isDeclaration()) 52697f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner return Error(Err, "Linking globals named '" + Src->getName() + 52797f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner "': symbols have different visibilities!"); 528aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner return false; 529aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner} 5305c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 5315c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// LinkGlobals - Loop through the global variables in the src module and merge 5328166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// them into the dest module. 533968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikovstatic bool LinkGlobals(Module *Dest, const Module *Src, 5345c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 5358166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 5365c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 5375c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 5380bb8757997392ee18ca9de0f1fab29463f8e7aebChris Lattner for (Module::const_global_iterator I = Src->global_begin(), 5390bb8757997392ee18ca9de0f1fab29463f8e7aebChris Lattner E = Src->global_end(); I != E; ++I) { 540968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov const GlobalVariable *SGV = I; 54101f69399352380532d480f6749daed660f50b15cAnton Korobeynikov GlobalValue *DGV = 0; 54201f69399352380532d480f6749daed660f50b15cAnton Korobeynikov 54301f69399352380532d480f6749daed660f50b15cAnton Korobeynikov // Check to see if may have to link the global with the global 544ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (SGV->hasName() && !SGV->hasInternalLinkage()) { 545ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer DGV = Dest->getGlobalVariable(SGV->getName()); 546ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (DGV && DGV->getType() != SGV->getType()) 547ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // If types don't agree due to opaque types, try to resolve them. 548bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner RecursiveResolveTypes(SGV->getType(), DGV->getType()); 549ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer } 5505c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 55101f69399352380532d480f6749daed660f50b15cAnton Korobeynikov // Check to see if may have to link the global with the alias 552aeb09967fdb2ff074c91ce8039ebd1917a2f6060Anton Korobeynikov if (!DGV && SGV->hasName() && !SGV->hasInternalLinkage()) { 55301f69399352380532d480f6749daed660f50b15cAnton Korobeynikov DGV = Dest->getNamedAlias(SGV->getName()); 55401f69399352380532d480f6749daed660f50b15cAnton Korobeynikov if (DGV && DGV->getType() != SGV->getType()) 55501f69399352380532d480f6749daed660f50b15cAnton Korobeynikov // If types don't agree due to opaque types, try to resolve them. 556bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner RecursiveResolveTypes(SGV->getType(), DGV->getType()); 55701f69399352380532d480f6749daed660f50b15cAnton Korobeynikov } 55801f69399352380532d480f6749daed660f50b15cAnton Korobeynikov 559aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (DGV && DGV->hasInternalLinkage()) 560aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner DGV = 0; 561aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner 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 571aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (!DGV) { 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 5748d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // later by LinkGlobalInits... 5752719bac90525985f4ebb97324b4c087d47b54384Chris Lattner GlobalVariable *NewDGV = 5762719bac90525985f4ebb97324b4c087d47b54384Chris Lattner new GlobalVariable(SGV->getType()->getElementType(), 5772719bac90525985f4ebb97324b4c087d47b54384Chris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 578a534b0f7bf0248bf90afe97110a34777e972f325Chris Lattner SGV->getName(), Dest, 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. 586c003628a612d3687fb77088a5894314210a65385Chris Lattner if (NewDGV->getName() != SGV->getName() && !NewDGV->hasInternalLinkage()) 587c003628a612d3687fb77088a5894314210a65385Chris Lattner ForceRenaming(NewDGV, SGV->getName()); 5885c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 5895c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Make sure to remember this mapping... 590817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[SGV] = NewDGV; 591817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov 5928166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (SGV->hasAppendingLinkage()) 5938166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Keep track that this is an appending variable... 5948166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV)); 595aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else if (DGV->hasAppendingLinkage()) { 5968166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // No linking is performed yet. Just insert a new copy of the global, and 5978166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // keep track of the fact that it is an appending variable in the 5988166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars map. The name is cleared out so that no linkage is 5998166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // performed. 6008166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NewDGV = 6018166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner new GlobalVariable(SGV->getType()->getElementType(), 6028166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 603a534b0f7bf0248bf90afe97110a34777e972f325Chris Lattner "", Dest, false, 604a534b0f7bf0248bf90afe97110a34777e972f325Chris Lattner SGV->getType()->getAddressSpace()); 6058166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 60675c7915c3a24f8063c274ccffe2dc9b7bc8bce1fAnton Korobeynikov // Set alignment allowing CopyGVAttributes merge it with alignment of SGV. 607ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer NewDGV->setAlignment(DGV->getAlignment()); 60875c7915c3a24f8063c274ccffe2dc9b7bc8bce1fAnton Korobeynikov // Propagate alignment, section and visibility info. 609ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer CopyGVAttributes(NewDGV, SGV); 6105dfbaf1fe3fa6914095cc55cde20b1ed25187b56Andrew Lenharth 6118166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Make sure to remember this mapping... 612817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[SGV] = NewDGV; 6138166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 6148166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Keep track that this is an appending variable... 6158166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV)); 61601f69399352380532d480f6749daed660f50b15cAnton Korobeynikov } else if (GlobalAlias *DGA = dyn_cast<GlobalAlias>(DGV)) { 61701f69399352380532d480f6749daed660f50b15cAnton Korobeynikov // SGV is global, but DGV is alias. The only valid mapping is when SGV is 61801f69399352380532d480f6749daed660f50b15cAnton Korobeynikov // external declaration, which is effectively a no-op. Also make sure 619817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov // linkage calculation was correct. 62001f69399352380532d480f6749daed660f50b15cAnton Korobeynikov if (SGV->isDeclaration() && !LinkFromSrc) { 62101f69399352380532d480f6749daed660f50b15cAnton Korobeynikov // Make sure to remember this mapping... 622817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[SGV] = DGA; 62301f69399352380532d480f6749daed660f50b15cAnton Korobeynikov } else 6241438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Global-Alias Collision on '" + SGV->getName() + 6251438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': symbol multiple defined"); 62601f69399352380532d480f6749daed660f50b15cAnton Korobeynikov } else if (GlobalVariable *DGVar = dyn_cast<GlobalVariable>(DGV)) { 627817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov // Otherwise, perform the global-global mapping as instructed by 628817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov // GetLinkageResult. 629aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (LinkFromSrc) { 630968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov // Propagate alignment, section, and visibility info. 63101f69399352380532d480f6749daed660f50b15cAnton Korobeynikov CopyGVAttributes(DGVar, SGV); 632968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov 633968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov // If the types don't match, and if we are to link from the source, nuke 634968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov // DGV and create a new one of the appropriate type. 63501f69399352380532d480f6749daed660f50b15cAnton Korobeynikov if (SGV->getType() != DGVar->getType()) { 636968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov GlobalVariable *NewDGV = 637968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov new GlobalVariable(SGV->getType()->getElementType(), 63801f69399352380532d480f6749daed660f50b15cAnton Korobeynikov DGVar->isConstant(), DGVar->getLinkage(), 639a534b0f7bf0248bf90afe97110a34777e972f325Chris Lattner /*init*/0, DGVar->getName(), Dest, false, 640a534b0f7bf0248bf90afe97110a34777e972f325Chris Lattner SGV->getType()->getAddressSpace()); 64101f69399352380532d480f6749daed660f50b15cAnton Korobeynikov CopyGVAttributes(NewDGV, DGVar); 642968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov DGV->replaceAllUsesWith(ConstantExpr::getBitCast(NewDGV, 64301f69399352380532d480f6749daed660f50b15cAnton Korobeynikov DGVar->getType())); 64401f69399352380532d480f6749daed660f50b15cAnton Korobeynikov // DGVar will conflict with NewDGV because they both had the same 645968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov // name. We must erase this now so ForceRenaming doesn't assert 646968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov // because DGV might not have internal linkage. 64701f69399352380532d480f6749daed660f50b15cAnton Korobeynikov DGVar->eraseFromParent(); 648968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov 649968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov // If the symbol table renamed the global, but it is an externally 650968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov // visible symbol, DGV must be an existing global with internal 651968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov // linkage. Rename it. 652968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov if (NewDGV->getName() != SGV->getName() && 653968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov !NewDGV->hasInternalLinkage()) 654968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov ForceRenaming(NewDGV, SGV->getName()); 655968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov 65601f69399352380532d480f6749daed660f50b15cAnton Korobeynikov DGVar = NewDGV; 657968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov } 658968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov 659aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // Inherit const as appropriate 66001f69399352380532d480f6749daed660f50b15cAnton Korobeynikov DGVar->setConstant(SGV->isConstant()); 661968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov 662968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov // Set initializer to zero, so we can link the stuff later 66301f69399352380532d480f6749daed660f50b15cAnton Korobeynikov DGVar->setInitializer(0); 664aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else { 665968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov // Special case for const propagation 66601f69399352380532d480f6749daed660f50b15cAnton Korobeynikov if (DGVar->isDeclaration() && SGV->isConstant() && !DGVar->isConstant()) 66701f69399352380532d480f6749daed660f50b15cAnton Korobeynikov DGVar->setConstant(true); 668aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 669aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner 670968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov // Set calculated linkage 67101f69399352380532d480f6749daed660f50b15cAnton Korobeynikov DGVar->setLinkage(NewLinkage); 672968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov 673968e39a5aba998a126278425da8287aae358e7a7Anton Korobeynikov // Make sure to remember this mapping... 674817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[SGV] = ConstantExpr::getBitCast(DGVar, SGV->getType()); 6755c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 6765c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 6775c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 6785c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 6795c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 68058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikovstatic GlobalValue::LinkageTypes 68158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton KorobeynikovCalculateAliasLinkage(const GlobalValue *SGV, const GlobalValue *DGV) { 68258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov if (SGV->hasExternalLinkage() || DGV->hasExternalLinkage()) 68358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov return GlobalValue::ExternalLinkage; 68458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov else if (SGV->hasWeakLinkage() || DGV->hasWeakLinkage()) 68558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov return GlobalValue::WeakLinkage; 68658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov else { 68758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov assert(SGV->hasInternalLinkage() && DGV->hasInternalLinkage() && 68858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov "Unexpected linkage type"); 68958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov return GlobalValue::InternalLinkage; 69058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } 69158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov} 69258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 69331ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio// LinkAlias - Loop through the alias in the src module and link them into the 69458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov// dest module. We're assuming, that all functions/global variables were already 69558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov// linked in. 6964fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikovstatic bool LinkAlias(Module *Dest, const Module *Src, 6974fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov std::map<const Value*, Value*> &ValueMap, 6984fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov std::string *Err) { 69931ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio // Loop over all alias in the src module 70031ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio for (Module::const_alias_iterator I = Src->alias_begin(), 70131ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio E = Src->alias_end(); I != E; ++I) { 70258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov const GlobalAlias *SGA = I; 70358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov const GlobalValue *SAliasee = SGA->getAliasedGlobal(); 70458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov GlobalAlias *NewGA = NULL; 70558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 70658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Globals were already linked, thus we can just query ValueMap for variant 707caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // of SAliasee in Dest. 70858d5e051574339106ce4139697ebadd21e34dbc0Ted Kremenek std::map<const Value*,Value*>::const_iterator VMI = ValueMap.find(SAliasee); 70958d5e051574339106ce4139697ebadd21e34dbc0Ted Kremenek assert(VMI != ValueMap.end() && "Aliasee not linked"); 71058d5e051574339106ce4139697ebadd21e34dbc0Ted Kremenek GlobalValue* DAliasee = cast<GlobalValue>(VMI->second); 711caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov GlobalValue* DGV = NULL; 71258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 71358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Try to find something 'similar' to SGA in destination module. 714caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (!DGV && !SGA->hasInternalLinkage()) { 715caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGV = Dest->getNamedAlias(SGA->getName()); 716caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 717caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // If types don't agree due to opaque types, try to resolve them. 718caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (DGV && DGV->getType() != SGA->getType()) 7195ed2ba26680f06846e7602ce65432b0a723b1273Chris Lattner RecursiveResolveTypes(SGA->getType(), DGV->getType()); 720caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } 721caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 722caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (!DGV && !SGA->hasInternalLinkage()) { 723caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGV = Dest->getGlobalVariable(SGA->getName()); 724caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 72558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // If types don't agree due to opaque types, try to resolve them. 726caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (DGV && DGV->getType() != SGA->getType()) 7275ed2ba26680f06846e7602ce65432b0a723b1273Chris Lattner RecursiveResolveTypes(SGA->getType(), DGV->getType()); 728caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } 72958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 730caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (!DGV && !SGA->hasInternalLinkage()) { 731caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGV = Dest->getFunction(SGA->getName()); 732caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 733caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // If types don't agree due to opaque types, try to resolve them. 734caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (DGV && DGV->getType() != SGA->getType()) 7355ed2ba26680f06846e7602ce65432b0a723b1273Chris Lattner RecursiveResolveTypes(SGA->getType(), DGV->getType()); 736caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } 737caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 738caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // No linking to be performed on internal stuff. 739caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (DGV && DGV->hasInternalLinkage()) 740caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGV = NULL; 741caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov 742caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (GlobalAlias *DGA = dyn_cast_or_null<GlobalAlias>(DGV)) { 743caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // Types are known to be the same, check whether aliasees equal. As 74458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // globals are already linked we just need query ValueMap to find the 74558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // mapping. 74658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov if (DAliasee == DGA->getAliasedGlobal()) { 74758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // This is just two copies of the same alias. Propagate linkage, if 74858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // necessary. 74958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov DGA->setLinkage(CalculateAliasLinkage(SGA, DGA)); 75058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 75158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov NewGA = DGA; 75258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Proceed to 'common' steps 75358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } else 7541438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Alias Collision on '" + SGA->getName()+ 7551438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': aliases have different aliasees"); 756caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } else if (GlobalVariable *DGVar = dyn_cast_or_null<GlobalVariable>(DGV)) { 757f88bc65932e5cf41ba6ca706cd1b1b1f65300248Anton Korobeynikov // The only allowed way is to link alias with external declaration or weak 758f88bc65932e5cf41ba6ca706cd1b1b1f65300248Anton Korobeynikov // symbol.. 75980585f1daac3570f19cd255c5006dfcf2ff65a89Anton Korobeynikov if (DGVar->isDeclaration() || DGVar->isWeakForLinker()) { 760ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov // But only if aliasee is global too... 761ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov if (!isa<GlobalVariable>(DAliasee)) 762caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov return Error(Err, "Global-Alias Collision on '" + SGA->getName() + 763caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov "': aliasee is not global variable"); 764ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov 76558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov NewGA = new GlobalAlias(SGA->getType(), SGA->getLinkage(), 76658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov SGA->getName(), DAliasee, Dest); 76758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov CopyGVAttributes(NewGA, SGA); 76858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 76958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Any uses of DGV need to change to NewGA, with cast, if needed. 770caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov if (SGA->getType() != DGVar->getType()) 771caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGVar->replaceAllUsesWith(ConstantExpr::getBitCast(NewGA, 772caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGVar->getType())); 77358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov else 774caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGVar->replaceAllUsesWith(NewGA); 77558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 776caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // DGVar will conflict with NewGA because they both had the same 77758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // name. We must erase this now so ForceRenaming doesn't assert 77858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // because DGV might not have internal linkage. 779caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov DGVar->eraseFromParent(); 78058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 78158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Proceed to 'common' steps 78258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } else 7831438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Global-Alias Collision on '" + SGA->getName() + 7841438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': symbol multiple defined"); 785caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov } else if (Function *DF = dyn_cast_or_null<Function>(DGV)) { 786f88bc65932e5cf41ba6ca706cd1b1b1f65300248Anton Korobeynikov // The only allowed way is to link alias with external declaration or weak 787f88bc65932e5cf41ba6ca706cd1b1b1f65300248Anton Korobeynikov // symbol... 78880585f1daac3570f19cd255c5006dfcf2ff65a89Anton Korobeynikov if (DF->isDeclaration() || DF->isWeakForLinker()) { 789ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov // But only if aliasee is function too... 790ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov if (!isa<Function>(DAliasee)) 791caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov return Error(Err, "Function-Alias Collision on '" + SGA->getName() + 792caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov "': aliasee is not function"); 793ed61c0bc76a7b9001d7639a908c955d0fae35bacAnton Korobeynikov 794b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov NewGA = new GlobalAlias(SGA->getType(), SGA->getLinkage(), 795b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov SGA->getName(), DAliasee, Dest); 796b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov CopyGVAttributes(NewGA, SGA); 797b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov 798b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // Any uses of DF need to change to NewGA, with cast, if needed. 799b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov if (SGA->getType() != DF->getType()) 800b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov DF->replaceAllUsesWith(ConstantExpr::getBitCast(NewGA, 801b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov DF->getType())); 802b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov else 803b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov DF->replaceAllUsesWith(NewGA); 804b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov 805b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // DF will conflict with NewGA because they both had the same 806b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // name. We must erase this now so ForceRenaming doesn't assert 807b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // because DF might not have internal linkage. 808b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov DF->eraseFromParent(); 809b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov 810b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // Proceed to 'common' steps 811b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov } else 8121438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Function-Alias Collision on '" + SGA->getName() + 8131438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': symbol multiple defined"); 81458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } else { 815caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // No linking to be performed, simply create an identical version of the 816caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // alias over in the dest module... 81758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 81858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov NewGA = new GlobalAlias(SGA->getType(), SGA->getLinkage(), 81958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov SGA->getName(), DAliasee, Dest); 82058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov CopyGVAttributes(NewGA, SGA); 82158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 82258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Proceed to 'common' steps 82358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } 82458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 82558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov assert(NewGA && "No alias was created in destination module!"); 82658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 827b8cdaf7099898d7c0eef4769bf6a89f39e7decc2Anton Korobeynikov // If the symbol table renamed the alias, but it is an externally visible 828caa8ae8125124822b01ac21a8de186c13fcdd8f3Anton Korobeynikov // symbol, DGA must be an global value with internal linkage. Rename it. 82958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov if (NewGA->getName() != SGA->getName() && 83058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov !NewGA->hasInternalLinkage()) 83158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov ForceRenaming(NewGA, SGA->getName()); 83258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 83358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Remember this mapping so uses in the source module get remapped 83458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // later by RemapOperand. 835817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[SGA] = NewGA; 83631ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio } 83758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 83831ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio return false; 83931ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio} 84031ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio 8415c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 8428d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// LinkGlobalInits - Update the initializers in the Dest module now that all 8438d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// globals that may be referenced are in Dest. 8448d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattnerstatic bool LinkGlobalInits(Module *Dest, const Module *Src, 8455c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 8465c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 8478d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 8488d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 8491127315562b221010040925980040fd4f65bdb1cChris Lattner for (Module::const_global_iterator I = Src->global_begin(), 8501127315562b221010040925980040fd4f65bdb1cChris Lattner E = Src->global_end(); I != E; ++I) { 85118961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const GlobalVariable *SGV = I; 8528d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 8538d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner if (SGV->hasInitializer()) { // Only process initialized GV's 8548d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Figure out what the initializer looks like in the dest module... 8554ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner Constant *SInit = 8560033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner cast<Constant>(RemapOperand(SGV->getInitializer(), ValueMap)); 8578d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 8580b12ecf6ff6b5d3a144178257b6206f0c4788792Anton Korobeynikov GlobalVariable *DGV = 8590b12ecf6ff6b5d3a144178257b6206f0c4788792Anton Korobeynikov cast<GlobalVariable>(ValueMap[SGV]->stripPointerCasts()); 8604ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (DGV->hasInitializer()) { 8614ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (SGV->hasExternalLinkage()) { 8624ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (DGV->getInitializer() != SInit) 8631438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov return Error(Err, "Global Variable Collision on '" + SGV->getName() + 8641438b9dd82887b8faa2c4670dca45965609a43c6Anton Korobeynikov "': global variables have different initializers"); 86580585f1daac3570f19cd255c5006dfcf2ff65a89Anton Korobeynikov } else if (DGV->isWeakForLinker()) { 8664ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // Nothing is required, mapped values will take the new global 8674ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // automatically. 86880585f1daac3570f19cd255c5006dfcf2ff65a89Anton Korobeynikov } else if (SGV->isWeakForLinker()) { 86957cb9883aa4c82357594d4186858f175135be3b1Chris Lattner // Nothing is required, mapped values will take the new global 87057cb9883aa4c82357594d4186858f175135be3b1Chris Lattner // automatically. 8714ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else if (DGV->hasAppendingLinkage()) { 8724ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(0 && "Appending linkage unimplemented!"); 8734ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else { 8744ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(0 && "Unknown linkage!"); 8754ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } 8768d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } else { 8778d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Copy the initializer over now... 8784ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner DGV->setInitializer(SInit); 8798d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 8808d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 8818d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 8828d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return false; 8838d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner} 8845c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 88579df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner// LinkFunctionProtos - Link the functions together between the two modules, 886c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// without doing function bodies... this just adds external function prototypes 887c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// to the Dest function... 8885c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 88979df7c0aaa18129e55968c8783ef8346807bd4afChris Lattnerstatic bool LinkFunctionProtos(Module *Dest, const Module *Src, 8905c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 8915c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 892619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer // Loop over all of the functions in the src module, mapping them over 8935c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner for (Module::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) { 89418961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const Function *SF = I; // SrcFunction 895824684982968244050e56357e736b9940c23e77dChris Lattner 896194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov GlobalValue *DGV = 0; 897ec91ccba3ca92d5e1f19fb0cb6e57a7d4a3f3195Chris Lattner Value *MappedDF; 898824684982968244050e56357e736b9940c23e77dChris Lattner 899824684982968244050e56357e736b9940c23e77dChris Lattner // If this function is internal or has no name, it doesn't participate in 900824684982968244050e56357e736b9940c23e77dChris Lattner // linkage. 9018bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer if (SF->hasName() && !SF->hasInternalLinkage()) { 9028bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer // Check to see if may have to link the function. 903194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov DGV = Dest->getFunction(SF->getName()); 9048bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer } 905194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov 906194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov // Check to see if may have to link the function with the alias 907194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov if (!DGV && SF->hasName() && !SF->hasInternalLinkage()) { 908194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov DGV = Dest->getNamedAlias(SF->getName()); 909194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov if (DGV && DGV->getType() != SF->getType()) 910194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov // If types don't agree due to opaque types, try to resolve them. 911194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov RecursiveResolveTypes(SF->getType(), DGV->getType()); 912194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov } 913194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov 914194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov if (DGV && DGV->hasInternalLinkage()) 915194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov DGV = 0; 916194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov 917824684982968244050e56357e736b9940c23e77dChris Lattner // If there is no linkage to be performed, just bring over SF without 918824684982968244050e56357e736b9940c23e77dChris Lattner // modifying it. 919194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov if (DGV == 0) { 920824684982968244050e56357e736b9940c23e77dChris Lattner // Function does not already exist, simply insert an function signature 921824684982968244050e56357e736b9940c23e77dChris Lattner // identical to SF into the dest module. 922824684982968244050e56357e736b9940c23e77dChris Lattner Function *NewDF = Function::Create(SF->getFunctionType(), 923824684982968244050e56357e736b9940c23e77dChris Lattner SF->getLinkage(), 924824684982968244050e56357e736b9940c23e77dChris Lattner SF->getName(), Dest); 925824684982968244050e56357e736b9940c23e77dChris Lattner CopyGVAttributes(NewDF, SF); 926824684982968244050e56357e736b9940c23e77dChris Lattner 927824684982968244050e56357e736b9940c23e77dChris Lattner // If the LLVM runtime renamed the function, but it is an externally 928824684982968244050e56357e736b9940c23e77dChris Lattner // visible symbol, DF must be an existing function with internal linkage. 929824684982968244050e56357e736b9940c23e77dChris Lattner // Rename it. 930824684982968244050e56357e736b9940c23e77dChris Lattner if (!NewDF->hasInternalLinkage() && NewDF->getName() != SF->getName()) 931824684982968244050e56357e736b9940c23e77dChris Lattner ForceRenaming(NewDF, SF->getName()); 932824684982968244050e56357e736b9940c23e77dChris Lattner 933824684982968244050e56357e736b9940c23e77dChris Lattner // ... and remember this mapping... 934824684982968244050e56357e736b9940c23e77dChris Lattner ValueMap[SF] = NewDF; 935824684982968244050e56357e736b9940c23e77dChris Lattner continue; 936194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov } else if (GlobalAlias *DGA = dyn_cast<GlobalAlias>(DGV)) { 937f88bc65932e5cf41ba6ca706cd1b1b1f65300248Anton Korobeynikov // SF is function, but DF is alias. 938f88bc65932e5cf41ba6ca706cd1b1b1f65300248Anton Korobeynikov // The only valid mappings are: 939f88bc65932e5cf41ba6ca706cd1b1b1f65300248Anton Korobeynikov // - SF is external declaration, which is effectively a no-op. 940f88bc65932e5cf41ba6ca706cd1b1b1f65300248Anton Korobeynikov // - SF is weak, when we just need to throw SF out. 94180585f1daac3570f19cd255c5006dfcf2ff65a89Anton Korobeynikov if (!SF->isDeclaration() && !SF->isWeakForLinker()) 942194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov return Error(Err, "Function-Alias Collision on '" + SF->getName() + 943194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov "': symbol multiple defined"); 944194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov 945194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov // Make sure to remember this mapping... 946f88bc65932e5cf41ba6ca706cd1b1b1f65300248Anton Korobeynikov ValueMap[SF] = ConstantExpr::getBitCast(DGA, SF->getType()); 947194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov continue; 948824684982968244050e56357e736b9940c23e77dChris Lattner } 949194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov 950194c2cef8a0036dd4e6295d048f37d6130f92389Anton Korobeynikov Function* DF = cast<Function>(DGV); 951824684982968244050e56357e736b9940c23e77dChris Lattner // If types don't agree because of opaque, try to resolve them. 952824684982968244050e56357e736b9940c23e77dChris Lattner if (SF->getType() != DF->getType()) 953bc1c82a0f73eda86cf24416cebc83b4690fcd76aChris Lattner RecursiveResolveTypes(SF->getType(), DF->getType()); 954824684982968244050e56357e736b9940c23e77dChris Lattner 955824684982968244050e56357e736b9940c23e77dChris Lattner // Check visibility, merging if a definition overrides a prototype. 956824684982968244050e56357e736b9940c23e77dChris Lattner if (SF->getVisibility() != DF->getVisibility()) { 95797f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner // If one is a prototype, ignore its visibility. Prototypes are always 95897f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner // overridden by the definition. 95997f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner if (!SF->isDeclaration() && !DF->isDeclaration()) 96097f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner return Error(Err, "Linking functions named '" + SF->getName() + 96197f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner "': symbols have different visibilities!"); 962bc3d1c7e4c290a35df801000222b8f4b2d51ef20Chris Lattner 963bc3d1c7e4c290a35df801000222b8f4b2d51ef20Chris Lattner // Otherwise, replace the visibility of DF if DF is a prototype. 964bc3d1c7e4c290a35df801000222b8f4b2d51ef20Chris Lattner if (DF->isDeclaration()) 965bc3d1c7e4c290a35df801000222b8f4b2d51ef20Chris Lattner DF->setVisibility(SF->getVisibility()); 96697f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner } 967ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer 968824684982968244050e56357e736b9940c23e77dChris Lattner if (DF->getType() != SF->getType()) { 969ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (DF->isDeclaration() && !SF->isDeclaration()) { 970ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // We have a definition of the same name but different type in the 971ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // source module. Copy the prototype to the destination and replace 972ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // uses of the destination's prototype with the new prototype. 973b1dbcd886a4b5597a839f299054b78b33fb2d6dfGabor Greif Function *NewDF = Function::Create(SF->getFunctionType(), 974b1dbcd886a4b5597a839f299054b78b33fb2d6dfGabor Greif SF->getLinkage(), 975051a950000e21935165db56695e35bade668193bGabor Greif SF->getName(), Dest); 976ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer CopyGVAttributes(NewDF, SF); 977ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer 978ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // Any uses of DF need to change to NewDF, with cast 979ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer DF->replaceAllUsesWith(ConstantExpr::getBitCast(NewDF, DF->getType())); 980ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer 981ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // DF will conflict with NewDF because they both had the same. We must 982ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // erase this now so ForceRenaming doesn't assert because DF might 983ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // not have internal linkage. 984ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer DF->eraseFromParent(); 985ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer 986ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // If the symbol table renamed the function, but it is an externally 987ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // visible symbol, DF must be an existing function with internal 988ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // linkage. Rename it. 989ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (NewDF->getName() != SF->getName() && !NewDF->hasInternalLinkage()) 990ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ForceRenaming(NewDF, SF->getName()); 991ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer 992ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // Remember this mapping so uses in the source module get remapped 993ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // later by RemapOperand. 994ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ValueMap[SF] = NewDF; 995ec91ccba3ca92d5e1f19fb0cb6e57a7d4a3f3195Chris Lattner continue; 996ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer } else { 997ec91ccba3ca92d5e1f19fb0cb6e57a7d4a3f3195Chris Lattner // We have two functions of the same name but different type. Any use 998ec91ccba3ca92d5e1f19fb0cb6e57a7d4a3f3195Chris Lattner // of the source must be mapped to the destination, with a cast. 999ec91ccba3ca92d5e1f19fb0cb6e57a7d4a3f3195Chris Lattner MappedDF = ConstantExpr::getBitCast(DF, SF->getType()); 1000ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer } 1001ec91ccba3ca92d5e1f19fb0cb6e57a7d4a3f3195Chris Lattner } else { 1002ec91ccba3ca92d5e1f19fb0cb6e57a7d4a3f3195Chris Lattner MappedDF = DF; 1003824684982968244050e56357e736b9940c23e77dChris Lattner } 1004824684982968244050e56357e736b9940c23e77dChris Lattner 1005824684982968244050e56357e736b9940c23e77dChris Lattner if (SF->isDeclaration()) { 1006ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // If SF is a declaration or if both SF & DF are declarations, just link 1007ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // the declarations, we aren't adding anything. 1008b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov if (SF->hasDLLImportLinkage()) { 10095cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer if (DF->isDeclaration()) { 1010ec91ccba3ca92d5e1f19fb0cb6e57a7d4a3f3195Chris Lattner ValueMap[SF] = MappedDF; 1011b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov DF->setLinkage(SF->getLinkage()); 1012822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner } 1013b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } else { 1014ec91ccba3ca92d5e1f19fb0cb6e57a7d4a3f3195Chris Lattner ValueMap[SF] = MappedDF; 1015822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner } 1016822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner continue; 1017822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner } 1018822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner 1019822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner // If DF is external but SF is not, link the external functions, update 1020822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner // linkage qualifiers. 1021822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner if (DF->isDeclaration() && !DF->hasDLLImportLinkage()) { 1022ec91ccba3ca92d5e1f19fb0cb6e57a7d4a3f3195Chris Lattner ValueMap.insert(std::make_pair(SF, MappedDF)); 1023c2b97d43a074445c6856d69538a95de09450c26eChris Lattner DF->setLinkage(SF->getLinkage()); 1024822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner continue; 1025822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner } 1026822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner 1027822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner // At this point we know that DF has LinkOnce, Weak, or External* linkage. 102880585f1daac3570f19cd255c5006dfcf2ff65a89Anton Korobeynikov if (SF->isWeakForLinker()) { 1029ec91ccba3ca92d5e1f19fb0cb6e57a7d4a3f3195Chris Lattner ValueMap[SF] = MappedDF; 103072ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner 103135956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner // Linkonce+Weak = Weak 103278ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // *+External Weak = * 103380585f1daac3570f19cd255c5006dfcf2ff65a89Anton Korobeynikov if ((DF->hasLinkOnceLinkage() && 1034aafce77b17d340aace52bcd49d1944109d82f14aDale Johannesen (SF->hasWeakLinkage() || SF->hasCommonLinkage())) || 103578ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov DF->hasExternalWeakLinkage()) 103635956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner DF->setLinkage(SF->getLinkage()); 1037822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner continue; 1038822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner } 1039822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner 104080585f1daac3570f19cd255c5006dfcf2ff65a89Anton Korobeynikov if (DF->isWeakForLinker()) { 104178ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // At this point we know that SF has LinkOnce or External* linkage. 1042ec91ccba3ca92d5e1f19fb0cb6e57a7d4a3f3195Chris Lattner ValueMap[SF] = MappedDF; 1043822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner 1044822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner // If the source function has stronger linkage than the destination, 1045822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner // its body and linkage should override ours. 1046822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner if (!SF->hasLinkOnceLinkage() && !SF->hasExternalWeakLinkage()) { 1047822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner // Don't inherit linkonce & external weak linkage. 104872ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner DF->setLinkage(SF->getLinkage()); 1049822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner DF->deleteBody(); 1050822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner } 1051822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner continue; 1052822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner } 1053822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner 1054822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner if (SF->getLinkage() != DF->getLinkage()) 1055822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner return Error(Err, "Functions named '" + SF->getName() + 1056822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner "' have different linkage specifiers!"); 1057822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner 1058822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner // The function is defined identically in both modules! 1059822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner if (SF->hasExternalLinkage()) 1060f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman return Error(Err, "Function '" + 1061f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman ToStr(SF->getFunctionType(), Src) + "':\"" + 1062c2b97d43a074445c6856d69538a95de09450c26eChris Lattner SF->getName() + "\" - Function is already defined!"); 1063822143e6f7271c6546434d2d0b3da7a29711020dChris Lattner assert(0 && "Unknown linkage configuration found!"); 10645c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 10655c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 10665c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 10675c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 1068c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBody - Copy the source function over into the dest function and 1069c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// fix up references to values. At this point we know that Dest is an external 1070c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function, and that Src is not. 10714bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattnerstatic bool LinkFunctionBody(Function *Dest, Function *Src, 1072ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer std::map<const Value*, Value*> &ValueMap, 10735c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 10745cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer assert(Src && Dest && Dest->isDeclaration() && !Src->isDeclaration()); 10755c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10760033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner // Go through and convert function arguments over, remembering the mapping. 1077e4d5c441e04bdc00ccf1804744af670655123b07Chris Lattner Function::arg_iterator DI = Dest->arg_begin(); 1078e4d5c441e04bdc00ccf1804744af670655123b07Chris Lattner for (Function::arg_iterator I = Src->arg_begin(), E = Src->arg_end(); 107969da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner I != E; ++I, ++DI) { 10806bc41e8a74d1756da0003641bfebd02a3d6d9586Owen Anderson DI->setName(I->getName()); // Copy the name information over... 10815c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10825c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Add a mapping to our local map 1083817bf2aeb22db13d03beb15e9bf17c425d0c694dAnton Korobeynikov ValueMap[I] = DI; 10845c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 10855c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 10864bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner // Splice the body of the source function into the dest function. 10874bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner Dest->getBasicBlockList().splice(Dest->end(), Src->getBasicBlockList()); 10885c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 1089c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // At this point, all of the instructions and values of the function are now 1090c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // copied over. The only problem is that they are still referencing values in 1091c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // the Source function as operands. Loop through all of the operands of the 1092c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // functions and patch them up to point to the local versions... 10935c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 109418961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Function::iterator BB = Dest->begin(), BE = Dest->end(); BB != BE; ++BB) 109518961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) 109618961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Instruction::op_iterator OI = I->op_begin(), OE = I->op_end(); 1097221d688a5ef21a22c2368c9fff0e92d7966c95e5Chris Lattner OI != OE; ++OI) 10984bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner if (!isa<Instruction>(*OI) && !isa<BasicBlock>(*OI)) 1099ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer *OI = RemapOperand(*OI, ValueMap); 11000033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner 11010033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner // There is no need to map the arguments anymore. 11021127315562b221010040925980040fd4f65bdb1cChris Lattner for (Function::arg_iterator I = Src->arg_begin(), E = Src->arg_end(); 11031127315562b221010040925980040fd4f65bdb1cChris Lattner I != E; ++I) 1104ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ValueMap.erase(I); 11055c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 11065c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 11075c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 11085c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 11095c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 1110c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBodies - Link in the function bodies that are defined in the 1111c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// source module into the DestModule. This consists basically of copying the 1112c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function over and fixing up references to values. 11134bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattnerstatic bool LinkFunctionBodies(Module *Dest, Module *Src, 11145c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 11155c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 11165c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 11178bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer // Loop over all of the functions in the src module, mapping them over as we 11188bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer // go 11194bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner for (Module::iterator SF = Src->begin(), E = Src->end(); SF != E; ++SF) { 1120619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer if (!SF->isDeclaration()) { // No body if function is external 1121ec91ccba3ca92d5e1f19fb0cb6e57a7d4a3f3195Chris Lattner Function *DF = dyn_cast<Function>(ValueMap[SF]); // Destination function 1122c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner 112318961504fc2b299578dba817900a0696cf3ccc4dChris Lattner // DF not external SF external? 1124ec91ccba3ca92d5e1f19fb0cb6e57a7d4a3f3195Chris Lattner if (DF && DF->isDeclaration()) 112535956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner // Only provide the function body if there isn't one already. 112635956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner if (LinkFunctionBody(DF, SF, ValueMap, Err)) 112735956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner return true; 1128c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner } 11295c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 11305c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 11315c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 11325c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 11338166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// LinkAppendingVars - If there were any appending global variables, link them 11348166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// together now. Return true on error. 11358166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattnerstatic bool LinkAppendingVars(Module *M, 11368166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 11378166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::string *ErrorMsg) { 11388166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (AppendingVars.empty()) return false; // Nothing to do. 1139f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 11408166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Loop over the multimap of appending vars, processing any variables with the 11418166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // same name, forming a new appending global variable with both of the 11428166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers merged together, then rewrite references to the old variables 11438166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // and delete them. 11448166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::vector<Constant*> Inits; 11458166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner while (AppendingVars.size() > 1) { 11468166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Get the first two elements in the map... 11478166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, 11488166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable*>::iterator Second = AppendingVars.begin(), First=Second++; 11498166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11508166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If the first two elements are for different names, there is no pair... 11518166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Otherwise there is a pair, so link them together... 11528166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (First->first == Second->first) { 11538166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *G1 = First->second, *G2 = Second->second; 11548166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T1 = cast<ArrayType>(G1->getType()->getElementType()); 11558166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T2 = cast<ArrayType>(G2->getType()->getElementType()); 1156f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 11578166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Check to see that they two arrays agree on type... 11588166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (T1->getElementType() != T2->getElementType()) 11598166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 11608166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables with different element types need to be linked!"); 11618166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (G1->isConstant() != G2->isConstant()) 11628166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 11638166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables linked with different const'ness!"); 11648166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11659613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio if (G1->getAlignment() != G2->getAlignment()) 11669613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio return Error(ErrorMsg, 11679613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio "Appending variables with different alignment need to be linked!"); 11689613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio 11699613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio if (G1->getVisibility() != G2->getVisibility()) 11709613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio return Error(ErrorMsg, 11719613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio "Appending variables with different visibility need to be linked!"); 11729613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio 11739613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio if (G1->getSection() != G2->getSection()) 11749613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio return Error(ErrorMsg, 11759613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio "Appending variables with different section name need to be linked!"); 11769613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio 11778166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner unsigned NewSize = T1->getNumElements() + T2->getNumElements(); 11788166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner ArrayType *NewType = ArrayType::get(T1->getElementType(), NewSize); 11798166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 1180ed74a4ef3b813bed0c0f4bb5af42229d50133da2Chris Lattner G1->setName(""); // Clear G1's name in case of a conflict! 1181ed74a4ef3b813bed0c0f4bb5af42229d50133da2Chris Lattner 11828166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Create the new global variable... 11838166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NG = 11848166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner new GlobalVariable(NewType, G1->isConstant(), G1->getLinkage(), 1185a534b0f7bf0248bf90afe97110a34777e972f325Chris Lattner /*init*/0, First->first, M, G1->isThreadLocal(), 1186a534b0f7bf0248bf90afe97110a34777e972f325Chris Lattner G1->getType()->getAddressSpace()); 11878166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 11889613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio // Propagate alignment, visibility and section info. 11899613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio CopyGVAttributes(NG, G1); 11909613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio 11918166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Merge the initializer... 11928166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.reserve(NewSize); 1193de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if (ConstantArray *I = dyn_cast<ConstantArray>(G1->getInitializer())) { 1194de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i) 1195cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos Inits.push_back(I->getOperand(i)); 1196de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } else { 1197de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner assert(isa<ConstantAggregateZero>(G1->getInitializer())); 1198de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Constant *CV = Constant::getNullValue(T1->getElementType()); 1199de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i) 1200de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(CV); 1201de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } 1202de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if (ConstantArray *I = dyn_cast<ConstantArray>(G2->getInitializer())) { 1203de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i) 1204cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos Inits.push_back(I->getOperand(i)); 1205de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } else { 1206de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner assert(isa<ConstantAggregateZero>(G2->getInitializer())); 1207de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Constant *CV = Constant::getNullValue(T2->getElementType()); 1208de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i) 1209de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(CV); 1210de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } 12118166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner NG->setInitializer(ConstantArray::get(NewType, Inits)); 12128166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.clear(); 12138166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 12148166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Replace any uses of the two global variables with uses of the new 12158166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // global... 12168166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 12178166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // FIXME: This should rewrite simple/straight-forward uses such as 12188166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // getelementptr instructions to not use the Cast! 12194da49122f3f3c8da68a52723d846b88c72166a68Reid Spencer G1->replaceAllUsesWith(ConstantExpr::getBitCast(NG, G1->getType())); 12204da49122f3f3c8da68a52723d846b88c72166a68Reid Spencer G2->replaceAllUsesWith(ConstantExpr::getBitCast(NG, G2->getType())); 12218166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 12228166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Remove the two globals from the module now... 12238166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G1); 12248166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G2); 12258166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 12268166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Put the new global into the AppendingVars map so that we can handle 12278166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // linking of more than two vars... 12288166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Second->second = NG; 12298166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 12308166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.erase(First); 12318166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 12328166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 12338166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return false; 12348166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner} 123552f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 12369f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikovstatic bool ResolveAliases(Module *Dest) { 12379f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikov for (Module::alias_iterator I = Dest->alias_begin(), E = Dest->alias_end(); 12385241957b1f6876452705f94e0ed60dd2c33a5c84Anton Korobeynikov I != E; ++I) 12395241957b1f6876452705f94e0ed60dd2c33a5c84Anton Korobeynikov if (const GlobalValue *GV = I->resolveAliasedGlobal()) 12405241957b1f6876452705f94e0ed60dd2c33a5c84Anton Korobeynikov if (!GV->isDeclaration()) 12415241957b1f6876452705f94e0ed60dd2c33a5c84Anton Korobeynikov I->replaceAllUsesWith(const_cast<GlobalValue*>(GV)); 12429f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikov 12439f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikov return false; 12449f2ee703663d8ca7d91cfdaf773fc70273e9e482Anton Korobeynikov} 124552f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 124652f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// LinkModules - This function links two modules together, with the resulting 124752f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// left module modified to be the composite of the two input modules. If an 124852f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// error occurs, true is returned and ErrorMsg (if not null) is set to indicate 12495c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// the problem. Upon failure, the Dest module could be in a modified state, and 12505c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// shouldn't be relied on to be consistent. 1251f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukmanbool 12520ba9e211bed7813949aaca97e6b15579c8188e05Reid SpencerLinker::LinkModules(Module *Dest, Module *Src, std::string *ErrorMsg) { 125357a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer assert(Dest != 0 && "Invalid Destination module"); 125457a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer assert(Src != 0 && "Invalid Source Module"); 125557a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 1256c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Dest->getDataLayout().empty()) { 1257c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (!Src->getDataLayout().empty()) { 1258ec9bfdc152a870d3c62377ed6855fb3bff69511cChris Lattner Dest->setDataLayout(Src->getDataLayout()); 1259c36357c406911ded5a0e2924998d885815370fdbChris Lattner } else { 1260c36357c406911ded5a0e2924998d885815370fdbChris Lattner std::string DataLayout; 1261c36357c406911ded5a0e2924998d885815370fdbChris Lattner 1262a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov if (Dest->getEndianness() == Module::AnyEndianness) { 1263c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Src->getEndianness() == Module::BigEndian) 1264c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append("E"); 1265c36357c406911ded5a0e2924998d885815370fdbChris Lattner else if (Src->getEndianness() == Module::LittleEndian) 1266c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append("e"); 1267a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov } 1268a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov 1269a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov if (Dest->getPointerSize() == Module::AnyPointerSize) { 1270c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Src->getPointerSize() == Module::Pointer64) 1271c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append(DataLayout.length() == 0 ? "p:64:64" : "-p:64:64"); 1272c36357c406911ded5a0e2924998d885815370fdbChris Lattner else if (Src->getPointerSize() == Module::Pointer32) 1273c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append(DataLayout.length() == 0 ? "p:32:32" : "-p:32:32"); 1274a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov } 1275c36357c406911ded5a0e2924998d885815370fdbChris Lattner Dest->setDataLayout(DataLayout); 1276c36357c406911ded5a0e2924998d885815370fdbChris Lattner } 1277c36357c406911ded5a0e2924998d885815370fdbChris Lattner } 1278873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner 1279f27dfcb210fec571d79bc881f5463e0b405707c0Chris Lattner // Copy the target triple from the source to dest if the dest's is empty. 1280c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Dest->getTargetTriple().empty() && !Src->getTargetTriple().empty()) 1281c36357c406911ded5a0e2924998d885815370fdbChris Lattner Dest->setTargetTriple(Src->getTargetTriple()); 1282c36357c406911ded5a0e2924998d885815370fdbChris Lattner 1283c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (!Src->getDataLayout().empty() && !Dest->getDataLayout().empty() && 1284c36357c406911ded5a0e2924998d885815370fdbChris Lattner Src->getDataLayout() != Dest->getDataLayout()) 128526f238589f9bb372d24b6fb2bc32edbf046fd9eeReid Spencer cerr << "WARNING: Linking two modules of different data layouts!\n"; 1286152f19ac6514ec29e183ddcdf2ea71599638dc4cChris Lattner if (!Src->getTargetTriple().empty() && 1287152f19ac6514ec29e183ddcdf2ea71599638dc4cChris Lattner Dest->getTargetTriple() != Src->getTargetTriple()) 1288e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << "WARNING: Linking two modules of different target triples!\n"; 1289f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 1290f27dfcb210fec571d79bc881f5463e0b405707c0Chris Lattner // Append the module inline asm string. 12916631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner if (!Src->getModuleInlineAsm().empty()) { 12926631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner if (Dest->getModuleInlineAsm().empty()) 12936631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner Dest->setModuleInlineAsm(Src->getModuleInlineAsm()); 1294e1b2e14f92e8e9da1eb4854511a881cf9c22af3cChris Lattner else 12956631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner Dest->setModuleInlineAsm(Dest->getModuleInlineAsm()+"\n"+ 12966631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner Src->getModuleInlineAsm()); 1297e1b2e14f92e8e9da1eb4854511a881cf9c22af3cChris Lattner } 1298e1b2e14f92e8e9da1eb4854511a881cf9c22af3cChris Lattner 1299719012d6254ee425464f034250176283fb96793bReid Spencer // Update the destination module's dependent libraries list with the libraries 130057a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // from the source module. There's no opportunity for duplicates here as the 130157a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // Module ensures that duplicate insertions are discarded. 1302f27dfcb210fec571d79bc881f5463e0b405707c0Chris Lattner for (Module::lib_iterator SI = Src->lib_begin(), SE = Src->lib_end(); 1303f27dfcb210fec571d79bc881f5463e0b405707c0Chris Lattner SI != SE; ++SI) 130457a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer Dest->addLibrary(*SI); 130557a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 13062c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // LinkTypes - Go through the symbol table of the Src module and see if any 13072c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // types are named in the src module that are not named in the Dst module. 13082c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Make sure there are no type name conflicts. 1309619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer if (LinkTypes(Dest, Src, ErrorMsg)) 1310619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer return true; 13112c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 13125c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // ValueMap - Mapping of values from what they used to be in Src, to what they 13135c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // are now in Dest. 13145c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> ValueMap; 13155c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 13168166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars - Keep track of global variables in the destination module 13178166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // with appending linkage. After the module is linked together, they are 13188166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // appended and the module is rewritten. 13198166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> AppendingVars; 13201127315562b221010040925980040fd4f65bdb1cChris Lattner for (Module::global_iterator I = Dest->global_begin(), E = Dest->global_end(); 13211127315562b221010040925980040fd4f65bdb1cChris Lattner I != E; ++I) { 13225a837defff581accc09048bea1cd839009e374a7Chris Lattner // Add all of the appending globals already in the Dest module to 13235a837defff581accc09048bea1cd839009e374a7Chris Lattner // AppendingVars. 1324f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner if (I->hasAppendingLinkage()) 1325f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner AppendingVars.insert(std::make_pair(I->getName(), I)); 13265a837defff581accc09048bea1cd839009e374a7Chris Lattner } 13275a837defff581accc09048bea1cd839009e374a7Chris Lattner 13288166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Insert all of the globals in src into the Dest module... without linking 13298166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers (which could refer to functions not yet mapped over). 1330ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (LinkGlobals(Dest, Src, ValueMap, AppendingVars, ErrorMsg)) 13315a837defff581accc09048bea1cd839009e374a7Chris Lattner return true; 13325c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 1333c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link the functions together between the two modules, without doing function 1334c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // bodies... this just adds external function prototypes to the Dest 1335c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // function... We do this so that when we begin processing function bodies, 1336c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // all of the global values that may be referenced are available in our 1337c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // ValueMap. 1338ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (LinkFunctionProtos(Dest, Src, ValueMap, ErrorMsg)) 13395a837defff581accc09048bea1cd839009e374a7Chris Lattner return true; 13405c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 13414fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov // If there were any alias, link them now. We really need to do this now, 13424fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov // because all of the aliases that may be referenced need to be available in 13434fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov // ValueMap 13444fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov if (LinkAlias(Dest, Src, ValueMap, ErrorMsg)) return true; 13454fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov 13466cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // Update the initializers in the Dest module now that all globals that may 13476cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // be referenced are in Dest. 13486cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner if (LinkGlobalInits(Dest, Src, ValueMap, ErrorMsg)) return true; 13496cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner 1350c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link in the function bodies that are defined in the source module into the 1351c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // DestModule. This consists basically of copying the function over and 1352c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // fixing up references to values. 135379df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner if (LinkFunctionBodies(Dest, Src, ValueMap, ErrorMsg)) return true; 135452f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 13558166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If there were any appending global variables, link them together now. 13568166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (LinkAppendingVars(Dest, AppendingVars, ErrorMsg)) return true; 13578166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 13583db9191baf5f5229a2f4d204c6332ba27fff81d0Anton Korobeynikov // Resolve all uses of aliases with aliasees 13593db9191baf5f5229a2f4d204c6332ba27fff81d0Anton Korobeynikov if (ResolveAliases(Dest)) return true; 13603db9191baf5f5229a2f4d204c6332ba27fff81d0Anton Korobeynikov 136157a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // If the source library's module id is in the dependent library list of the 136257a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // destination library, remove it since that module is now linked in. 136357a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer sys::Path modId; 1364dd04df0ec33a903ee7fc747701bafde622f77d8bReid Spencer modId.set(Src->getModuleIdentifier()); 136507adb2836b8aa7a3872e33c285958f5937662b50Reid Spencer if (!modId.isEmpty()) 136607adb2836b8aa7a3872e33c285958f5937662b50Reid Spencer Dest->removeLibrary(modId.getBasename()); 136757a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 136852f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner return false; 136952f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner} 13709466f5113ba859677a28887c3c7143065e702019Vikram S. Adve 1371567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer// vim: sw=2 1372