LinkModules.cpp revision b5a4bd86df527c7d164197906861d2ca6f48678d
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" 291a097e30d39e60303ae2b19f7a56e813f3e3c18eBill Wendling#include <sstream> 30f7703df4968084c18c248c1feea9961c19a32e6aChris Lattnerusing namespace llvm; 31d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke 325c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// Error - Simple wrapper function to conditionally assign to E and return true. 335c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// This just makes error return conditions a little bit simpler... 348166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattnerstatic inline bool Error(std::string *E, const std::string &Message) { 355c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner if (E) *E = Message; 365c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return true; 375c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 385c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 39719012d6254ee425464f034250176283fb96793bReid Spencer// ToStr - Simple wrapper function to convert a type to a string. 4072cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattnerstatic std::string ToStr(const Type *Ty, const Module *M) { 4172cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattner std::ostringstream OS; 4272cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattner WriteTypeSymbolic(OS, Ty, M); 4372cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattner return OS.str(); 4472cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattner} 4572cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattner 46700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 47700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Function: ResolveTypes() 48700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 49700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Description: 50700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Attempt to link the two specified types together. 51700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 52700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Inputs: 53700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// DestTy - The type to which we wish to resolve. 54700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// SrcTy - The original type which we want to resolve. 55700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Name - The name of the type. 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// 64e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattnerstatic bool ResolveTypes(const Type *DestTy, const Type *SrcTy, 6578d033e086e19e016273de014f9214aa6f3f844bReid Spencer TypeSymbolTable *DestST, const std::string &Name) { 66e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DestTy == SrcTy) return false; // If already equal, noop 67e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 684c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Does the type already exist in the module? 694c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (DestTy && !isa<OpaqueType>(DestTy)) { // Yup, the type already exists... 70e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (const OpaqueType *OT = dyn_cast<OpaqueType>(SrcTy)) { 71e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner const_cast<OpaqueType*>(OT)->refineAbstractTypeTo(DestTy); 724c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } else { 734c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner return true; // Cannot link types... neither is opaque and not-equal 744c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 754c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } else { // Type not in dest module. Add it now. 764c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (DestTy) // Type _is_ in module, just opaque... 77e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner const_cast<OpaqueType*>(cast<OpaqueType>(DestTy)) 78e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner ->refineAbstractTypeTo(SrcTy); 79fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner else if (!Name.empty()) 80e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner DestST->insert(Name, const_cast<Type*>(SrcTy)); 814c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 824c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner return false; 834c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner} 844c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 8543f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattnerstatic const FunctionType *getFT(const PATypeHolder &TH) { 8643f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return cast<FunctionType>(TH.get()); 8743f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner} 889732be769e57f1dec03f046ab957053048f60e40Chris Lattnerstatic const StructType *getST(const PATypeHolder &TH) { 8943f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return cast<StructType>(TH.get()); 9043f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner} 91e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 92e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// RecursiveResolveTypes - This is just like ResolveTypes, except that it 93e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// recurses down into derived types, merging the used types if the parent types 94e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// are compatible. 95e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattnerstatic bool RecursiveResolveTypesI(const PATypeHolder &DestTy, 96e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner const PATypeHolder &SrcTy, 9778d033e086e19e016273de014f9214aa6f3f844bReid Spencer TypeSymbolTable *DestST, 9878d033e086e19e016273de014f9214aa6f3f844bReid Spencer const std::string &Name, 99e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner std::vector<std::pair<PATypeHolder, PATypeHolder> > &Pointers) { 10043f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner const Type *SrcTyT = SrcTy.get(); 10143f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner const Type *DestTyT = DestTy.get(); 10243f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner if (DestTyT == SrcTyT) return false; // If already equal, noop 103f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 104e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // If we found our opaque type, resolve it now! 10543f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner if (isa<OpaqueType>(DestTyT) || isa<OpaqueType>(SrcTyT)) 10643f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return ResolveTypes(DestTyT, SrcTyT, DestST, Name); 107f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 108e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Two types cannot be resolved together if they are of different primitive 109e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // type. For example, we cannot resolve an int to a float. 110f70c22b019494723d0e706f93d6542dfaa6e73a5Chris Lattner if (DestTyT->getTypeID() != SrcTyT->getTypeID()) return true; 111e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 112e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Otherwise, resolve the used type used by this derived type... 113f70c22b019494723d0e706f93d6542dfaa6e73a5Chris Lattner switch (DestTyT->getTypeID()) { 114a54b7cbd452b3adb2f51346140d996b29c2cdb30Reid Spencer case Type::IntegerTyID: { 115a54b7cbd452b3adb2f51346140d996b29c2cdb30Reid Spencer if (cast<IntegerType>(DestTyT)->getBitWidth() != 116a54b7cbd452b3adb2f51346140d996b29c2cdb30Reid Spencer cast<IntegerType>(SrcTyT)->getBitWidth()) 117a54b7cbd452b3adb2f51346140d996b29c2cdb30Reid Spencer return true; 118a54b7cbd452b3adb2f51346140d996b29c2cdb30Reid Spencer return false; 119a54b7cbd452b3adb2f51346140d996b29c2cdb30Reid Spencer } 120e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::FunctionTyID: { 12143f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner if (cast<FunctionType>(DestTyT)->isVarArg() != 122841e00b96295a2b66cb7573e961656d28a6cb12bChris Lattner cast<FunctionType>(SrcTyT)->isVarArg() || 123841e00b96295a2b66cb7573e961656d28a6cb12bChris Lattner cast<FunctionType>(DestTyT)->getNumContainedTypes() != 124841e00b96295a2b66cb7573e961656d28a6cb12bChris Lattner cast<FunctionType>(SrcTyT)->getNumContainedTypes()) 12543f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return true; 12643f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner for (unsigned i = 0, e = getFT(DestTy)->getNumContainedTypes(); i != e; ++i) 127e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner if (RecursiveResolveTypesI(getFT(DestTy)->getContainedType(i), 128e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner getFT(SrcTy)->getContainedType(i), DestST, "", 129e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner Pointers)) 130e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return true; 131e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return false; 132e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 133e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::StructTyID: { 134f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman if (getST(DestTy)->getNumContainedTypes() != 13543f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner getST(SrcTy)->getNumContainedTypes()) return 1; 13643f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner for (unsigned i = 0, e = getST(DestTy)->getNumContainedTypes(); i != e; ++i) 137e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner if (RecursiveResolveTypesI(getST(DestTy)->getContainedType(i), 138e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner getST(SrcTy)->getContainedType(i), DestST, "", 139e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner Pointers)) 140e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return true; 141e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return false; 142e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 143e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::ArrayTyID: { 14443f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner const ArrayType *DAT = cast<ArrayType>(DestTy.get()); 14543f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner const ArrayType *SAT = cast<ArrayType>(SrcTy.get()); 146e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DAT->getNumElements() != SAT->getNumElements()) return true; 147e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner return RecursiveResolveTypesI(DAT->getElementType(), SAT->getElementType(), 148e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner DestST, "", Pointers); 149e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner } 150e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner case Type::PointerTyID: { 151e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // If this is a pointer type, check to see if we have already seen it. If 152e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // so, we are in a recursive branch. Cut off the search now. We cannot use 153e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // an associative container for this search, because the type pointers (keys 154e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // in the container) change whenever types get resolved... 155e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner for (unsigned i = 0, e = Pointers.size(); i != e; ++i) 156e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner if (Pointers[i].first == DestTy) 157e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner return Pointers[i].second != SrcTy; 158e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner 159e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // Otherwise, add the current pointers to the vector to stop recursion on 160e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // this pair. 161e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner Pointers.push_back(std::make_pair(DestTyT, SrcTyT)); 162e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner bool Result = 163e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner RecursiveResolveTypesI(cast<PointerType>(DestTy.get())->getElementType(), 164e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner cast<PointerType>(SrcTy.get())->getElementType(), 165e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner DestST, "", Pointers); 166e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner Pointers.pop_back(); 167e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner return Result; 168e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 169e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner default: assert(0 && "Unexpected type!"); return true; 170f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman } 171e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner} 172e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 173e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattnerstatic bool RecursiveResolveTypes(const PATypeHolder &DestTy, 174e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner const PATypeHolder &SrcTy, 17578d033e086e19e016273de014f9214aa6f3f844bReid Spencer TypeSymbolTable *DestST, 17678d033e086e19e016273de014f9214aa6f3f844bReid Spencer const std::string &Name){ 177e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner std::vector<std::pair<PATypeHolder, PATypeHolder> > PointerTypes; 178e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner return RecursiveResolveTypesI(DestTy, SrcTy, DestST, Name, PointerTypes); 179e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner} 180e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner 181e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 1822c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// LinkTypes - Go through the symbol table of the Src module and see if any 1832c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// types are named in the src module that are not named in the Dst module. 1842c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// Make sure there are no type name conflicts. 1855c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic bool LinkTypes(Module *Dest, const Module *Src, std::string *Err) { 18678d033e086e19e016273de014f9214aa6f3f844bReid Spencer TypeSymbolTable *DestST = &Dest->getTypeSymbolTable(); 18778d033e086e19e016273de014f9214aa6f3f844bReid Spencer const TypeSymbolTable *SrcST = &Src->getTypeSymbolTable(); 1882c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 1892c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Look for a type plane for Type's... 19078d033e086e19e016273de014f9214aa6f3f844bReid Spencer TypeSymbolTable::const_iterator TI = SrcST->begin(); 19178d033e086e19e016273de014f9214aa6f3f844bReid Spencer TypeSymbolTable::const_iterator TE = SrcST->end(); 192567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer if (TI == TE) return false; // No named types, do nothing. 1932c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 194cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // Some types cannot be resolved immediately because they depend on other 195cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // types being resolved to each other first. This contains a list of types we 196cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // are waiting to recheck. 1974c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner std::vector<std::string> DelayedTypesToResolve; 1984c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 199567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer for ( ; TI != TE; ++TI ) { 200567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer const std::string &Name = TI->first; 201c28a224c68adf0464c275778af4bce762ad25d37Reid Spencer const Type *RHS = TI->second; 2022c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 2032c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Check to see if this type name is already in the dest module... 20478d033e086e19e016273de014f9214aa6f3f844bReid Spencer Type *Entry = DestST->lookup(Name); 2054c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 2064c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (ResolveTypes(Entry, RHS, DestST, Name)) { 2074c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // They look different, save the types 'till later to resolve. 2084c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner DelayedTypesToResolve.push_back(Name); 2094c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 2104c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 2114c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 2124c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Iteratively resolve types while we can... 2134c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner while (!DelayedTypesToResolve.empty()) { 2144c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Loop over all of the types, attempting to resolve them if possible... 2154c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner unsigned OldSize = DelayedTypesToResolve.size(); 2164c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 217e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Try direct resolution by name... 2184c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner for (unsigned i = 0; i != DelayedTypesToResolve.size(); ++i) { 2194c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner const std::string &Name = DelayedTypesToResolve[i]; 22078d033e086e19e016273de014f9214aa6f3f844bReid Spencer Type *T1 = SrcST->lookup(Name); 22178d033e086e19e016273de014f9214aa6f3f844bReid Spencer Type *T2 = DestST->lookup(Name); 2224c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (!ResolveTypes(T2, T1, DestST, Name)) { 2234c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // We are making progress! 2244c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i); 2254c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner --i; 2262f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner } 2274c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 2282f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner 2294c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Did we not eliminate any types? 2304c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (DelayedTypesToResolve.size() == OldSize) { 231e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Attempt to resolve subelements of types. This allows us to merge these 232e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // two types: { int* } and { opaque* } 2334c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner for (unsigned i = 0, e = DelayedTypesToResolve.size(); i != e; ++i) { 2344c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner const std::string &Name = DelayedTypesToResolve[i]; 23578d033e086e19e016273de014f9214aa6f3f844bReid Spencer PATypeHolder T1(SrcST->lookup(Name)); 23678d033e086e19e016273de014f9214aa6f3f844bReid Spencer PATypeHolder T2(DestST->lookup(Name)); 237e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 238e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (!RecursiveResolveTypes(T2, T1, DestST, Name)) { 239e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // We are making progress! 240e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i); 241f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 242e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Go back to the main loop, perhaps we can resolve directly by name 243e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // now... 244e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner break; 245e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 246e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 247e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 248e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // If we STILL cannot resolve the types, then there is something wrong. 249e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DelayedTypesToResolve.size() == OldSize) { 250aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner // Remove the symbol name from the destination. 251aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner DelayedTypesToResolve.pop_back(); 2524c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 2532c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner } 2542c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner } 2554c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 2564c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 2572c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner return false; 2582c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner} 2592c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 2605c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic void PrintMap(const std::map<const Value*, Value*> &M) { 2615c2d335d86579941b71816196a95a64b277e8963Chris Lattner for (std::map<const Value*, Value*>::const_iterator I = M.begin(), E =M.end(); 2622d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner I != E; ++I) { 263e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << " Fr: " << (void*)I->first << " "; 26487182ae6baf28ca6da6ee4bc00cf1857f293acfeChris Lattner I->first->dump(); 265e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << " To: " << (void*)I->second << " "; 26687182ae6baf28ca6da6ee4bc00cf1857f293acfeChris Lattner I->second->dump(); 267e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << "\n"; 2682d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner } 2692d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner} 2702d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 2712d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 272619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer// RemapOperand - Use ValueMap to convert constants from one module to another. 2735c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic Value *RemapOperand(const Value *In, 2740033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner std::map<const Value*, Value*> &ValueMap) { 2750033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner std::map<const Value*,Value*>::const_iterator I = ValueMap.find(In); 276ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (I != ValueMap.end()) 277ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer return I->second; 2785c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 279619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer // Check to see if it's a constant that we are interested in transforming. 280620fd68b1086b4d99b23951357299bee357aa62aChris Lattner Value *Result = 0; 28118961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (const Constant *CPV = dyn_cast<Constant>(In)) { 282de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if ((!isa<DerivedType>(CPV->getType()) && !isa<ConstantExpr>(CPV)) || 283a54b7cbd452b3adb2f51346140d996b29c2cdb30Reid Spencer isa<ConstantInt>(CPV) || isa<ConstantAggregateZero>(CPV)) 2840033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner return const_cast<Constant*>(CPV); // Simple constants stay identical. 2858d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 28618961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (const ConstantArray *CPA = dyn_cast<ConstantArray>(CPV)) { 287cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos std::vector<Constant*> Operands(CPA->getNumOperands()); 288cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i) 2890033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner Operands[i] =cast<Constant>(RemapOperand(CPA->getOperand(i), ValueMap)); 290e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Result = ConstantArray::get(cast<ArrayType>(CPA->getType()), Operands); 29118961504fc2b299578dba817900a0696cf3ccc4dChris Lattner } else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(CPV)) { 292cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos std::vector<Constant*> Operands(CPS->getNumOperands()); 293cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i) 2940033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner Operands[i] =cast<Constant>(RemapOperand(CPS->getOperand(i), ValueMap)); 295e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Result = ConstantStruct::get(cast<StructType>(CPS->getType()), Operands); 296b976e668165e1875a8f1eb7af800e33bb1e4393dChris Lattner } else if (isa<ConstantPointerNull>(CPV) || isa<UndefValue>(CPV)) { 29718961504fc2b299578dba817900a0696cf3ccc4dChris Lattner Result = const_cast<Constant*>(CPV); 2989d6565a5b1fbc4286d6ee638d8f47a3171a9ed7eReid Spencer } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CPV)) { 299a88eb9287eb14ba62ca6324b2b249e0ae9fe3309Chris Lattner std::vector<Constant*> Operands(CP->getNumOperands()); 300a88eb9287eb14ba62ca6324b2b249e0ae9fe3309Chris Lattner for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i) 301a88eb9287eb14ba62ca6324b2b249e0ae9fe3309Chris Lattner Operands[i] = cast<Constant>(RemapOperand(CP->getOperand(i), ValueMap)); 3029d6565a5b1fbc4286d6ee638d8f47a3171a9ed7eReid Spencer Result = ConstantVector::get(Operands); 3036cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) { 30427d672136a57519095a3ef20161697749cffb57cChris Lattner std::vector<Constant*> Ops; 30527d672136a57519095a3ef20161697749cffb57cChris Lattner for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) 30627d672136a57519095a3ef20161697749cffb57cChris Lattner Ops.push_back(cast<Constant>(RemapOperand(CE->getOperand(i),ValueMap))); 30727d672136a57519095a3ef20161697749cffb57cChris Lattner Result = CE->getWithOperands(Ops); 308619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer } else if (isa<GlobalValue>(CPV)) { 309619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer assert(0 && "Unmapped global?"); 3108d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } else { 3118d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner assert(0 && "Unknown type of derived type constant value!"); 3128d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 313620fd68b1086b4d99b23951357299bee357aa62aChris Lattner } else if (isa<InlineAsm>(In)) { 314620fd68b1086b4d99b23951357299bee357aa62aChris Lattner Result = const_cast<Value*>(In); 315620fd68b1086b4d99b23951357299bee357aa62aChris Lattner } 316620fd68b1086b4d99b23951357299bee357aa62aChris Lattner 317619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer // Cache the mapping in our local map structure 318620fd68b1086b4d99b23951357299bee357aa62aChris Lattner if (Result) { 3190033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner ValueMap.insert(std::make_pair(In, Result)); 3208d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return Result; 3218d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 3228bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer 3232d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 324e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << "LinkModules ValueMap: \n"; 3250033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner PrintMap(ValueMap); 3262d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 327e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << "Couldn't remap value: " << (void*)In << " " << *In << "\n"; 3288d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner assert(0 && "Couldn't remap value!"); 3298d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return 0; 3305c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 3315c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 3328bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer/// ForceRenaming - The LLVM SymbolTable class autorenames globals that conflict 3338bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer/// in the symbol table. This is good for all clients except for us. Go 3348bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer/// through the trouble to force this back. 335c003628a612d3687fb77088a5894314210a65385Chris Lattnerstatic void ForceRenaming(GlobalValue *GV, const std::string &Name) { 336c003628a612d3687fb77088a5894314210a65385Chris Lattner assert(GV->getName() != Name && "Can't force rename to self"); 337ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ValueSymbolTable &ST = GV->getParent()->getValueSymbolTable(); 338c003628a612d3687fb77088a5894314210a65385Chris Lattner 339c003628a612d3687fb77088a5894314210a65385Chris Lattner // If there is a conflict, rename the conflict. 34033f294930e0affa51c3818405741abd80cc90316Chris Lattner if (GlobalValue *ConflictGV = cast_or_null<GlobalValue>(ST.lookup(Name))) { 341ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer assert(ConflictGV->hasInternalLinkage() && 342ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer "Not conflicting with a static global, should link instead!"); 34333f294930e0affa51c3818405741abd80cc90316Chris Lattner GV->takeName(ConflictGV); 34433f294930e0affa51c3818405741abd80cc90316Chris Lattner ConflictGV->setName(Name); // This will cause ConflictGV to get renamed 345ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer assert(ConflictGV->getName() != Name && "ForceRenaming didn't work"); 34633f294930e0affa51c3818405741abd80cc90316Chris Lattner } else { 34733f294930e0affa51c3818405741abd80cc90316Chris Lattner GV->setName(Name); // Force the name back 348ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer } 349ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer} 350ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer 351ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer/// CopyGVAttributes - copy additional attributes (those not needed to construct 352ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer/// a GlobalValue) from the SrcGV to the DestGV. 353ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencerstatic void CopyGVAttributes(GlobalValue *DestGV, const GlobalValue *SrcGV) { 354ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // Propagate alignment, visibility and section info. 355ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer DestGV->setAlignment(std::max(DestGV->getAlignment(), SrcGV->getAlignment())); 356ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer DestGV->setSection(SrcGV->getSection()); 357ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer DestGV->setVisibility(SrcGV->getVisibility()); 358ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (const Function *SrcF = dyn_cast<Function>(SrcGV)) { 359ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer Function *DestF = cast<Function>(DestGV); 360ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer DestF->setCallingConv(SrcF->getCallingConv()); 361dc024674ff96820d6020757b48d47f46d4c07db2Duncan Sands DestF->setParamAttrs(SrcF->getParamAttrs()); 362194c90ed2a8e74b5a1c5184835f84c572d524dadGordon Henriksen if (SrcF->hasCollector()) 363194c90ed2a8e74b5a1c5184835f84c572d524dadGordon Henriksen DestF->setCollector(SrcF->getCollector()); 364ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer } 365c003628a612d3687fb77088a5894314210a65385Chris Lattner} 366c003628a612d3687fb77088a5894314210a65385Chris Lattner 367aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// GetLinkageResult - This analyzes the two global values and determines what 368aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// the result will look like in the destination module. In particular, it 369aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// computes the resultant linkage type, computes whether the global in the 370aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// source should be copied over to the destination (replacing the existing 3719cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov/// one), and computes whether this linkage is an error or not. It also performs 3729cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov/// visibility checks: we cannot link together two symbols with different 3739cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov/// visibilities. 374aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattnerstatic bool GetLinkageResult(GlobalValue *Dest, GlobalValue *Src, 375aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner GlobalValue::LinkageTypes <, bool &LinkFromSrc, 376aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner std::string *Err) { 377aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner assert((!Dest || !Src->hasInternalLinkage()) && 378aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "If Src has internal linkage, Dest shouldn't be set!"); 379aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (!Dest) { 380aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // Linking something to nothing. 381aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 382aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 3835cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer } else if (Src->isDeclaration()) { 384aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // If Src is external or if both Src & Drc are external.. Just link the 385aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // external globals, we aren't adding anything. 386b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov if (Src->hasDLLImportLinkage()) { 38778ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // If one of GVs has DLLImport linkage, result should be dllimport'ed. 3885cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer if (Dest->isDeclaration()) { 389b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LinkFromSrc = true; 390b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LT = Src->getLinkage(); 391b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } 3928753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth } else if (Dest->hasExternalWeakLinkage()) { 3938753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth //If the Dest is weak, use the source linkage 3948753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth LinkFromSrc = true; 3958753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth LT = Src->getLinkage(); 396b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } else { 397b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LinkFromSrc = false; 398b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LT = Dest->getLinkage(); 399b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } 4005cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer } else if (Dest->isDeclaration() && !Dest->hasDLLImportLinkage()) { 401aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // If Dest is external but Src is not: 402aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 403aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 404aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else if (Src->hasAppendingLinkage() || Dest->hasAppendingLinkage()) { 405aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (Src->getLinkage() != Dest->getLinkage()) 406aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner return Error(Err, "Linking globals named '" + Src->getName() + 407aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "': can only link appending global with another appending global!"); 408aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; // Special cased. 409aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 410aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else if (Src->hasWeakLinkage() || Src->hasLinkOnceLinkage()) { 411619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer // At this point we know that Dest has LinkOnce, External*, Weak, or 412619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer // DLL* linkage. 41378ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov if ((Dest->hasLinkOnceLinkage() && Src->hasWeakLinkage()) || 41478ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Dest->hasExternalWeakLinkage()) { 415aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 416aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 417aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else { 418aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = false; 419aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Dest->getLinkage(); 420aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 421aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else if (Dest->hasWeakLinkage() || Dest->hasLinkOnceLinkage()) { 42278ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // At this point we know that Src has External* or DLL* linkage. 42378ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov if (Src->hasExternalWeakLinkage()) { 42478ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LinkFromSrc = false; 42578ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LT = Dest->getLinkage(); 42678ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov } else { 42778ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LinkFromSrc = true; 42878ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LT = GlobalValue::ExternalLinkage; 42978ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov } 430aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else { 431b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov assert((Dest->hasExternalLinkage() || 432b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov Dest->hasDLLImportLinkage() || 43378ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Dest->hasDLLExportLinkage() || 43478ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Dest->hasExternalWeakLinkage()) && 435b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov (Src->hasExternalLinkage() || 436b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov Src->hasDLLImportLinkage() || 43778ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Src->hasDLLExportLinkage() || 43878ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Src->hasExternalWeakLinkage()) && 439aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "Unexpected linkage type!"); 440f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman return Error(Err, "Linking globals named '" + Src->getName() + 441aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "': symbol multiply defined!"); 442aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 4439cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov 4449cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov // Check visibility 4459cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov if (Dest && Src->getVisibility() != Dest->getVisibility()) 44697f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner if (!Src->isDeclaration() && !Dest->isDeclaration()) 44797f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner return Error(Err, "Linking globals named '" + Src->getName() + 44897f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner "': symbols have different visibilities!"); 449aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner return false; 450aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner} 4515c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4525c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// LinkGlobals - Loop through the global variables in the src module and merge 4538166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// them into the dest module. 454aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattnerstatic bool LinkGlobals(Module *Dest, Module *Src, 4555c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 4568166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 4575c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 4585c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 4591127315562b221010040925980040fd4f65bdb1cChris Lattner for (Module::global_iterator I = Src->global_begin(), E = Src->global_end(); 4601127315562b221010040925980040fd4f65bdb1cChris Lattner I != E; ++I) { 461aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner GlobalVariable *SGV = I; 4624ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner GlobalVariable *DGV = 0; 4635a837defff581accc09048bea1cd839009e374a7Chris Lattner // Check to see if may have to link the global. 464ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (SGV->hasName() && !SGV->hasInternalLinkage()) { 465ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer DGV = Dest->getGlobalVariable(SGV->getName()); 466ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (DGV && DGV->getType() != SGV->getType()) 467ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // If types don't agree due to opaque types, try to resolve them. 468ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer RecursiveResolveTypes(SGV->getType(), DGV->getType(), 469ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer &Dest->getTypeSymbolTable(), ""); 470ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer } 4715c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 472aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (DGV && DGV->hasInternalLinkage()) 473aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner DGV = 0; 474aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner 475c318329a1098a19137398af4d880f4d8cdd9cd8dDan Gohman assert((SGV->hasInitializer() || SGV->hasExternalWeakLinkage() || 476c318329a1098a19137398af4d880f4d8cdd9cd8dDan Gohman SGV->hasExternalLinkage() || SGV->hasDLLImportLinkage()) && 4774ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner "Global must either be external or have an initializer!"); 4785c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 479b324bd735ff5c99a52cd3c3f5d01c0e1398a2d3aChris Lattner GlobalValue::LinkageTypes NewLinkage = GlobalValue::InternalLinkage; 480b324bd735ff5c99a52cd3c3f5d01c0e1398a2d3aChris Lattner bool LinkFromSrc = false; 481aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (GetLinkageResult(DGV, SGV, NewLinkage, LinkFromSrc, Err)) 482aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner return true; 4830fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner 484aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (!DGV) { 4855c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // No linking to be performed, simply create an identical version of the 4868d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // symbol over in the dest module... the initializer will be filled in 4878d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // later by LinkGlobalInits... 4882719bac90525985f4ebb97324b4c087d47b54384Chris Lattner GlobalVariable *NewDGV = 4892719bac90525985f4ebb97324b4c087d47b54384Chris Lattner new GlobalVariable(SGV->getType()->getElementType(), 4902719bac90525985f4ebb97324b4c087d47b54384Chris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 491c763552299165b88d34a7d4f2d76ff413cbc7f67Lauro Ramos Venancio SGV->getName(), Dest, SGV->isThreadLocal()); 492471feac1b297b9458de18d973af371bf7f10296bReid Spencer // Propagate alignment, visibility and section info. 493ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer CopyGVAttributes(NewDGV, SGV); 4945dfbaf1fe3fa6914095cc55cde20b1ed25187b56Andrew Lenharth 4952719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // If the LLVM runtime renamed the global, but it is an externally visible 4962719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // symbol, DGV must be an existing global with internal linkage. Rename 4972719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // it. 498c003628a612d3687fb77088a5894314210a65385Chris Lattner if (NewDGV->getName() != SGV->getName() && !NewDGV->hasInternalLinkage()) 499c003628a612d3687fb77088a5894314210a65385Chris Lattner ForceRenaming(NewDGV, SGV->getName()); 5005c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 5015c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Make sure to remember this mapping... 5022719bac90525985f4ebb97324b4c087d47b54384Chris Lattner ValueMap.insert(std::make_pair(SGV, NewDGV)); 5038166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (SGV->hasAppendingLinkage()) 5048166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Keep track that this is an appending variable... 5058166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV)); 506aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else if (DGV->hasAppendingLinkage()) { 5078166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // No linking is performed yet. Just insert a new copy of the global, and 5088166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // keep track of the fact that it is an appending variable in the 5098166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars map. The name is cleared out so that no linkage is 5108166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // performed. 5118166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NewDGV = 5128166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner new GlobalVariable(SGV->getType()->getElementType(), 5138166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 514c763552299165b88d34a7d4f2d76ff413cbc7f67Lauro Ramos Venancio "", Dest, SGV->isThreadLocal()); 5158166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 516471feac1b297b9458de18d973af371bf7f10296bReid Spencer // Propagate alignment, section and visibility info. 517ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer NewDGV->setAlignment(DGV->getAlignment()); 518ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer CopyGVAttributes(NewDGV, SGV); 5195dfbaf1fe3fa6914095cc55cde20b1ed25187b56Andrew Lenharth 5208166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Make sure to remember this mapping... 5218166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner ValueMap.insert(std::make_pair(SGV, NewDGV)); 5228166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 5238166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Keep track that this is an appending variable... 5248166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV)); 5254ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else { 526471feac1b297b9458de18d973af371bf7f10296bReid Spencer // Propagate alignment, section, and visibility info. 527ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer CopyGVAttributes(DGV, SGV); 5285dfbaf1fe3fa6914095cc55cde20b1ed25187b56Andrew Lenharth 529aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // Otherwise, perform the mapping as instructed by GetLinkageResult. If 530aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // the types don't match, and if we are to link from the source, nuke DGV 531aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // and create a new one of the appropriate type. 532aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (SGV->getType() != DGV->getType() && LinkFromSrc) { 533aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner GlobalVariable *NewDGV = 534aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner new GlobalVariable(SGV->getType()->getElementType(), 535aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner DGV->isConstant(), DGV->getLinkage()); 536c763552299165b88d34a7d4f2d76ff413cbc7f67Lauro Ramos Venancio NewDGV->setThreadLocal(DGV->isThreadLocal()); 537ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer CopyGVAttributes(NewDGV, DGV); 538aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner Dest->getGlobalList().insert(DGV, NewDGV); 5394da49122f3f3c8da68a52723d846b88c72166a68Reid Spencer DGV->replaceAllUsesWith( 5404da49122f3f3c8da68a52723d846b88c72166a68Reid Spencer ConstantExpr::getBitCast(NewDGV, DGV->getType())); 541aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner DGV->eraseFromParent(); 542aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner NewDGV->setName(SGV->getName()); 543aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner DGV = NewDGV; 544aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 545aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner 546aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner DGV->setLinkage(NewLinkage); 547aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner 548aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (LinkFromSrc) { 549aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // Inherit const as appropriate 550e6f8c5a71682ffcc33d3c83a40821ded8f2c8033Chris Lattner DGV->setConstant(SGV->isConstant()); 551aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner DGV->setInitializer(0); 552aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else { 553aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (SGV->isConstant() && !DGV->isConstant()) { 5545cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer if (DGV->isDeclaration()) 555aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner DGV->setConstant(true); 556aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 557c8ef1edc63508d21bf8e38112fc125cde01fdbb9Chris Lattner SGV->setLinkage(GlobalValue::ExternalLinkage); 558c8ef1edc63508d21bf8e38112fc125cde01fdbb9Chris Lattner SGV->setInitializer(0); 559aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 560aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner 5614da49122f3f3c8da68a52723d846b88c72166a68Reid Spencer ValueMap.insert( 5624da49122f3f3c8da68a52723d846b88c72166a68Reid Spencer std::make_pair(SGV, ConstantExpr::getBitCast(DGV, SGV->getType()))); 5635c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 5645c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 5655c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 5665c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 5675c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 56858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikovstatic GlobalValue::LinkageTypes 56958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton KorobeynikovCalculateAliasLinkage(const GlobalValue *SGV, const GlobalValue *DGV) { 57058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov if (SGV->hasExternalLinkage() || DGV->hasExternalLinkage()) 57158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov return GlobalValue::ExternalLinkage; 57258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov else if (SGV->hasWeakLinkage() || DGV->hasWeakLinkage()) 57358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov return GlobalValue::WeakLinkage; 57458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov else { 57558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov assert(SGV->hasInternalLinkage() && DGV->hasInternalLinkage() && 57658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov "Unexpected linkage type"); 57758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov return GlobalValue::InternalLinkage; 57858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } 57958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov} 58058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 58131ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio// LinkAlias - Loop through the alias in the src module and link them into the 58258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov// dest module. We're assuming, that all functions/global variables were already 58358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov// linked in. 5844fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikovstatic bool LinkAlias(Module *Dest, const Module *Src, 5854fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov std::map<const Value*, Value*> &ValueMap, 5864fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov std::string *Err) { 58731ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio // Loop over all alias in the src module 58831ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio for (Module::const_alias_iterator I = Src->alias_begin(), 58931ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio E = Src->alias_end(); I != E; ++I) { 59058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov const GlobalAlias *SGA = I; 59158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov const GlobalValue *SAliasee = SGA->getAliasedGlobal(); 59258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov GlobalAlias *NewGA = NULL; 59358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 59458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Globals were already linked, thus we can just query ValueMap for variant 59558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // of SAliasee in Dest 59658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov std::map<const Value*,Value*>::const_iterator I = ValueMap.find(SAliasee); 59758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov assert(I != ValueMap.end() && "Aliasee not linked"); 59858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov GlobalValue* DAliasee = cast<GlobalValue>(I->second); 59958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 60058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Try to find something 'similar' to SGA in destination module. 60158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov if (GlobalAlias *DGA = Dest->getNamedAlias(SGA->getName())) { 60258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // If types don't agree due to opaque types, try to resolve them. 60358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov if (RecursiveResolveTypes(SGA->getType(), DGA->getType(), 60458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov &Dest->getTypeSymbolTable(), "")) 60558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov return Error(Err, "Alias Collision on '" + 60658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov ToStr(SGA->getType(), Src) +"':%"+SGA->getName()+ 60758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov " - aliases have different types"); 60858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 60958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Now types are known to be the same, check whether aliasees equal. As 61058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // globals are already linked we just need query ValueMap to find the 61158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // mapping. 61258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov if (DAliasee == DGA->getAliasedGlobal()) { 61358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // This is just two copies of the same alias. Propagate linkage, if 61458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // necessary. 61558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov DGA->setLinkage(CalculateAliasLinkage(SGA, DGA)); 61658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 61758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov NewGA = DGA; 61858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Proceed to 'common' steps 61958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } else 62058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov return Error(Err, "Alias Collision on '" + 62158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov ToStr(SGA->getType(), Src) +"':%"+SGA->getName()+ 62258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov " - aliases have different aliasees"); 62358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } else if (GlobalVariable *DGV = Dest->getGlobalVariable(SGA->getName())) { 62458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov RecursiveResolveTypes(SGA->getType(), DGV->getType(), 62558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov &Dest->getTypeSymbolTable(), ""); 626b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov 62758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // The only allowed way is to link alias with external declaration. 62858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov if (DGV->isDeclaration()) { 62958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov NewGA = new GlobalAlias(SGA->getType(), SGA->getLinkage(), 63058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov SGA->getName(), DAliasee, Dest); 63158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov CopyGVAttributes(NewGA, SGA); 63258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 63358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Any uses of DGV need to change to NewGA, with cast, if needed. 63458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov if (SGA->getType() != DGV->getType()) 63558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov DGV->replaceAllUsesWith(ConstantExpr::getBitCast(NewGA, 63658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov DGV->getType())); 63758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov else 63858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov DGV->replaceAllUsesWith(NewGA); 63958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 64058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // DGV will conflict with NewGA because they both had the same 64158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // name. We must erase this now so ForceRenaming doesn't assert 64258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // because DGV might not have internal linkage. 64358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov DGV->eraseFromParent(); 64458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 64558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Proceed to 'common' steps 64658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } else 64758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov return Error(Err, "Alias Collision on '" + 64858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov ToStr(SGA->getType(), Src) +"':%"+SGA->getName()+ 64958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov " - symbol multiple defined"); 65058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } else if (Function *DF = Dest->getFunction(SGA->getName())) { 65158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov RecursiveResolveTypes(SGA->getType(), DF->getType(), 65258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov &Dest->getTypeSymbolTable(), ""); 653b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov 654b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // The only allowed way is to link alias with external declaration. 655b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov if (DF->isDeclaration()) { 656b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov NewGA = new GlobalAlias(SGA->getType(), SGA->getLinkage(), 657b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov SGA->getName(), DAliasee, Dest); 658b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov CopyGVAttributes(NewGA, SGA); 659b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov 660b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // Any uses of DF need to change to NewGA, with cast, if needed. 661b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov if (SGA->getType() != DF->getType()) 662b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov DF->replaceAllUsesWith(ConstantExpr::getBitCast(NewGA, 663b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov DF->getType())); 664b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov else 665b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov DF->replaceAllUsesWith(NewGA); 666b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov 667b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // DF will conflict with NewGA because they both had the same 668b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // name. We must erase this now so ForceRenaming doesn't assert 669b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // because DF might not have internal linkage. 670b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov DF->eraseFromParent(); 671b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov 672b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov // Proceed to 'common' steps 673b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov } else 674b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov return Error(Err, "Alias Collision on '" + 675b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov ToStr(SGA->getType(), Src) +"':%"+SGA->getName()+ 676b5a4bd86df527c7d164197906861d2ca6f48678dAnton Korobeynikov " - symbol multiple defined"); 67758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } else { 67858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Nothing similar found, just copy alias into destination module. 67958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 68058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov NewGA = new GlobalAlias(SGA->getType(), SGA->getLinkage(), 68158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov SGA->getName(), DAliasee, Dest); 68258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov CopyGVAttributes(NewGA, SGA); 68358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 68458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Proceed to 'common' steps 68558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov } 68658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 68758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov assert(NewGA && "No alias was created in destination module!"); 68858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 68958887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // If the symbol table renamed the function, but it is an externally 69058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // visible symbol, DGV must be an existing function with internal 69158887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // linkage. Rename it. 69258887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov if (NewGA->getName() != SGA->getName() && 69358887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov !NewGA->hasInternalLinkage()) 69458887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov ForceRenaming(NewGA, SGA->getName()); 69558887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 69658887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // Remember this mapping so uses in the source module get remapped 69758887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov // later by RemapOperand. 69858887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov ValueMap.insert(std::make_pair(SGA, NewGA)); 69931ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio } 70058887bc59316bcaf0c0675a45ddecd6994f3fbc6Anton Korobeynikov 70131ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio return false; 70231ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio} 70331ed0fb804dd86fb15093e114701932119914400Lauro Ramos Venancio 7045c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 7058d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// LinkGlobalInits - Update the initializers in the Dest module now that all 7068d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// globals that may be referenced are in Dest. 7078d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattnerstatic bool LinkGlobalInits(Module *Dest, const Module *Src, 7085c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 7095c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 7108d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 7118d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 7121127315562b221010040925980040fd4f65bdb1cChris Lattner for (Module::const_global_iterator I = Src->global_begin(), 7131127315562b221010040925980040fd4f65bdb1cChris Lattner E = Src->global_end(); I != E; ++I) { 71418961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const GlobalVariable *SGV = I; 7158d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 7168d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner if (SGV->hasInitializer()) { // Only process initialized GV's 7178d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Figure out what the initializer looks like in the dest module... 7184ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner Constant *SInit = 7190033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner cast<Constant>(RemapOperand(SGV->getInitializer(), ValueMap)); 7208d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 721f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman GlobalVariable *DGV = cast<GlobalVariable>(ValueMap[SGV]); 7224ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (DGV->hasInitializer()) { 7234ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (SGV->hasExternalLinkage()) { 7244ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (DGV->getInitializer() != SInit) 725f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman return Error(Err, "Global Variable Collision on '" + 72672cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattner ToStr(SGV->getType(), Src) +"':%"+SGV->getName()+ 7274ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner " - Global variables have different initializers"); 72872ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner } else if (DGV->hasLinkOnceLinkage() || DGV->hasWeakLinkage()) { 7294ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // Nothing is required, mapped values will take the new global 7304ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // automatically. 73157cb9883aa4c82357594d4186858f175135be3b1Chris Lattner } else if (SGV->hasLinkOnceLinkage() || SGV->hasWeakLinkage()) { 73257cb9883aa4c82357594d4186858f175135be3b1Chris Lattner // Nothing is required, mapped values will take the new global 73357cb9883aa4c82357594d4186858f175135be3b1Chris Lattner // automatically. 7344ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else if (DGV->hasAppendingLinkage()) { 7354ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(0 && "Appending linkage unimplemented!"); 7364ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else { 7374ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(0 && "Unknown linkage!"); 7384ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } 7398d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } else { 7408d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Copy the initializer over now... 7414ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner DGV->setInitializer(SInit); 7428d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 7438d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 7448d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 7458d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return false; 7468d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner} 7475c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 74879df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner// LinkFunctionProtos - Link the functions together between the two modules, 749c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// without doing function bodies... this just adds external function prototypes 750c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// to the Dest function... 7515c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 75279df7c0aaa18129e55968c8783ef8346807bd4afChris Lattnerstatic bool LinkFunctionProtos(Module *Dest, const Module *Src, 7535c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 7545c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 755619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer // Loop over all of the functions in the src module, mapping them over 7565c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner for (Module::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) { 75718961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const Function *SF = I; // SrcFunction 7584ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner Function *DF = 0; 7598bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer if (SF->hasName() && !SF->hasInternalLinkage()) { 7608bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer // Check to see if may have to link the function. 761ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer DF = Dest->getFunction(SF->getName()); 762ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (DF && SF->getType() != DF->getType()) 763ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // If types don't agree because of opaque, try to resolve them 764ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer RecursiveResolveTypes(SF->getType(), DF->getType(), 765ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer &Dest->getTypeSymbolTable(), ""); 7668bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer } 7679cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov 7689cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov // Check visibility 7699cd3ccf5065a8a139e458d016c88a8512471598bAnton Korobeynikov if (DF && !DF->hasInternalLinkage() && 77097f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner SF->getVisibility() != DF->getVisibility()) { 77197f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner // If one is a prototype, ignore its visibility. Prototypes are always 77297f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner // overridden by the definition. 77397f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner if (!SF->isDeclaration() && !DF->isDeclaration()) 77497f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner return Error(Err, "Linking functions named '" + SF->getName() + 77597f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner "': symbols have different visibilities!"); 77697f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner } 777ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer 778650d5053bfb388bc81aecd202f16d2e128e1f23eAnton Korobeynikov if (DF && DF->hasInternalLinkage()) 779650d5053bfb388bc81aecd202f16d2e128e1f23eAnton Korobeynikov DF = NULL; 780650d5053bfb388bc81aecd202f16d2e128e1f23eAnton Korobeynikov 781ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (DF && DF->getType() != SF->getType()) { 782ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (DF->isDeclaration() && !SF->isDeclaration()) { 783ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // We have a definition of the same name but different type in the 784ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // source module. Copy the prototype to the destination and replace 785ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // uses of the destination's prototype with the new prototype. 786ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer Function *NewDF = new Function(SF->getFunctionType(), SF->getLinkage(), 787ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer SF->getName(), Dest); 788ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer CopyGVAttributes(NewDF, SF); 789ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer 790ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // Any uses of DF need to change to NewDF, with cast 791ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer DF->replaceAllUsesWith(ConstantExpr::getBitCast(NewDF, DF->getType())); 792ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer 793ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // DF will conflict with NewDF because they both had the same. We must 794ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // erase this now so ForceRenaming doesn't assert because DF might 795ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // not have internal linkage. 796ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer DF->eraseFromParent(); 797ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer 798ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // If the symbol table renamed the function, but it is an externally 799ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // visible symbol, DF must be an existing function with internal 800ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // linkage. Rename it. 801ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (NewDF->getName() != SF->getName() && !NewDF->hasInternalLinkage()) 802ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ForceRenaming(NewDF, SF->getName()); 803ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer 804ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // Remember this mapping so uses in the source module get remapped 805ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // later by RemapOperand. 806ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ValueMap[SF] = NewDF; 807ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer } else if (SF->isDeclaration()) { 808ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // We have two functions of the same name but different type and the 809ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // source is a declaration while the destination is not. Any use of 810ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // the source must be mapped to the destination, with a cast. 811ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ValueMap[SF] = ConstantExpr::getBitCast(DF, SF->getType()); 812ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer } else { 813ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // We have two functions of the same name but different types and they 814ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // are both definitions. This is an error. 815ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer return Error(Err, "Function '" + DF->getName() + "' defined as both '" + 816ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ToStr(SF->getFunctionType(), Src) + "' and '" + 817ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ToStr(DF->getFunctionType(), Dest) + "'"); 818ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer } 819ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer } else if (!DF || SF->hasInternalLinkage() || DF->hasInternalLinkage()) { 8200fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner // Function does not already exist, simply insert an function signature 82197f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner // identical to SF into the dest module. 8222719bac90525985f4ebb97324b4c087d47b54384Chris Lattner Function *NewDF = new Function(SF->getFunctionType(), SF->getLinkage(), 8232719bac90525985f4ebb97324b4c087d47b54384Chris Lattner SF->getName(), Dest); 824ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer CopyGVAttributes(NewDF, SF); 8252719bac90525985f4ebb97324b4c087d47b54384Chris Lattner 8262719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // If the LLVM runtime renamed the function, but it is an externally 8272719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // visible symbol, DF must be an existing function with internal linkage. 8282719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // Rename it. 829c003628a612d3687fb77088a5894314210a65385Chris Lattner if (NewDF->getName() != SF->getName() && !NewDF->hasInternalLinkage()) 83082b5b219dd3b9035442389ddcd58e6f859aae039Chris Lattner ForceRenaming(NewDF, SF->getName()); 8314ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner 8324ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // ... and remember this mapping... 8332719bac90525985f4ebb97324b4c087d47b54384Chris Lattner ValueMap.insert(std::make_pair(SF, NewDF)); 8345cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer } else if (SF->isDeclaration()) { 835ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // If SF is a declaration or if both SF & DF are declarations, just link 836ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // the declarations, we aren't adding anything. 837b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov if (SF->hasDLLImportLinkage()) { 8385cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer if (DF->isDeclaration()) { 839b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov ValueMap.insert(std::make_pair(SF, DF)); 840b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov DF->setLinkage(SF->getLinkage()); 841b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } 842b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } else { 843b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov ValueMap.insert(std::make_pair(SF, DF)); 8448bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer } 8455cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer } else if (DF->isDeclaration() && !DF->hasDLLImportLinkage()) { 846b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov // If DF is external but SF is not... 847c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // Link the external functions, update linkage qualifiers 848c2b97d43a074445c6856d69538a95de09450c26eChris Lattner ValueMap.insert(std::make_pair(SF, DF)); 849c2b97d43a074445c6856d69538a95de09450c26eChris Lattner DF->setLinkage(SF->getLinkage()); 85097f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner // Visibility of prototype is overridden by vis of definition. 85197f8b0900abddfa72fd59e777399280adb4ca0a6Chris Lattner DF->setVisibility(SF->getVisibility()); 85235956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner } else if (SF->hasWeakLinkage() || SF->hasLinkOnceLinkage()) { 85378ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // At this point we know that DF has LinkOnce, Weak, or External* linkage. 85472ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner ValueMap.insert(std::make_pair(SF, DF)); 85572ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner 85635956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner // Linkonce+Weak = Weak 85778ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // *+External Weak = * 85878ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov if ((DF->hasLinkOnceLinkage() && SF->hasWeakLinkage()) || 85978ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov DF->hasExternalWeakLinkage()) 86035956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner DF->setLinkage(SF->getLinkage()); 86135956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner } else if (DF->hasWeakLinkage() || DF->hasLinkOnceLinkage()) { 86278ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // At this point we know that SF has LinkOnce or External* linkage. 86372ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner ValueMap.insert(std::make_pair(SF, DF)); 86478ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov if (!SF->hasLinkOnceLinkage() && !SF->hasExternalWeakLinkage()) 86578ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // Don't inherit linkonce & external weak linkage 86672ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner DF->setLinkage(SF->getLinkage()); 867c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SF->getLinkage() != DF->getLinkage()) { 868ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer return Error(Err, "Functions named '" + SF->getName() + 869ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer "' have different linkage specifiers!"); 870c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SF->hasExternalLinkage()) { 871ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer // The function is defined identically in both modules!! 872f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman return Error(Err, "Function '" + 873f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman ToStr(SF->getFunctionType(), Src) + "':\"" + 874c2b97d43a074445c6856d69538a95de09450c26eChris Lattner SF->getName() + "\" - Function is already defined!"); 875c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else { 876c2b97d43a074445c6856d69538a95de09450c26eChris Lattner assert(0 && "Unknown linkage configuration found!"); 8775c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 8785c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 8795c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 8805c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 8815c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 882c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBody - Copy the source function over into the dest function and 883c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// fix up references to values. At this point we know that Dest is an external 884c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function, and that Src is not. 8854bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattnerstatic bool LinkFunctionBody(Function *Dest, Function *Src, 886ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer std::map<const Value*, Value*> &ValueMap, 8875c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 8885cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer assert(Src && Dest && Dest->isDeclaration() && !Src->isDeclaration()); 8895c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 8900033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner // Go through and convert function arguments over, remembering the mapping. 891e4d5c441e04bdc00ccf1804744af670655123b07Chris Lattner Function::arg_iterator DI = Dest->arg_begin(); 892e4d5c441e04bdc00ccf1804744af670655123b07Chris Lattner for (Function::arg_iterator I = Src->arg_begin(), E = Src->arg_end(); 89369da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner I != E; ++I, ++DI) { 89469da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner DI->setName(I->getName()); // Copy the name information over... 8955c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 8965c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Add a mapping to our local map 897ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ValueMap.insert(std::make_pair(I, DI)); 8985c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 8995c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 9004bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner // Splice the body of the source function into the dest function. 9014bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner Dest->getBasicBlockList().splice(Dest->end(), Src->getBasicBlockList()); 9025c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 903c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // At this point, all of the instructions and values of the function are now 904c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // copied over. The only problem is that they are still referencing values in 905c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // the Source function as operands. Loop through all of the operands of the 906c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // functions and patch them up to point to the local versions... 9075c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 90818961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Function::iterator BB = Dest->begin(), BE = Dest->end(); BB != BE; ++BB) 90918961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) 91018961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Instruction::op_iterator OI = I->op_begin(), OE = I->op_end(); 911221d688a5ef21a22c2368c9fff0e92d7966c95e5Chris Lattner OI != OE; ++OI) 9124bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner if (!isa<Instruction>(*OI) && !isa<BasicBlock>(*OI)) 913ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer *OI = RemapOperand(*OI, ValueMap); 9140033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner 9150033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner // There is no need to map the arguments anymore. 9161127315562b221010040925980040fd4f65bdb1cChris Lattner for (Function::arg_iterator I = Src->arg_begin(), E = Src->arg_end(); 9171127315562b221010040925980040fd4f65bdb1cChris Lattner I != E; ++I) 918ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer ValueMap.erase(I); 9195c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 9205c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 9215c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 9225c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 9235c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 924c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBodies - Link in the function bodies that are defined in the 925c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// source module into the DestModule. This consists basically of copying the 926c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function over and fixing up references to values. 9274bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattnerstatic bool LinkFunctionBodies(Module *Dest, Module *Src, 9285c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 9295c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 9305c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 9318bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer // Loop over all of the functions in the src module, mapping them over as we 9328bef0373f1b8fab20b9acd277377ca01d72bac7eReid Spencer // go 9334bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner for (Module::iterator SF = Src->begin(), E = Src->end(); SF != E; ++SF) { 934619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer if (!SF->isDeclaration()) { // No body if function is external 93518961504fc2b299578dba817900a0696cf3ccc4dChris Lattner Function *DF = cast<Function>(ValueMap[SF]); // Destination function 936c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner 93718961504fc2b299578dba817900a0696cf3ccc4dChris Lattner // DF not external SF external? 938ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (DF->isDeclaration()) 93935956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner // Only provide the function body if there isn't one already. 94035956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner if (LinkFunctionBody(DF, SF, ValueMap, Err)) 94135956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner return true; 942c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner } 9435c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 9445c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 9455c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 9465c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 9478166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// LinkAppendingVars - If there were any appending global variables, link them 9488166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// together now. Return true on error. 9498166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattnerstatic bool LinkAppendingVars(Module *M, 9508166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 9518166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::string *ErrorMsg) { 9528166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (AppendingVars.empty()) return false; // Nothing to do. 953f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 9548166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Loop over the multimap of appending vars, processing any variables with the 9558166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // same name, forming a new appending global variable with both of the 9568166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers merged together, then rewrite references to the old variables 9578166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // and delete them. 9588166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::vector<Constant*> Inits; 9598166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner while (AppendingVars.size() > 1) { 9608166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Get the first two elements in the map... 9618166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, 9628166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable*>::iterator Second = AppendingVars.begin(), First=Second++; 9638166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 9648166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If the first two elements are for different names, there is no pair... 9658166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Otherwise there is a pair, so link them together... 9668166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (First->first == Second->first) { 9678166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *G1 = First->second, *G2 = Second->second; 9688166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T1 = cast<ArrayType>(G1->getType()->getElementType()); 9698166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T2 = cast<ArrayType>(G2->getType()->getElementType()); 970f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 9718166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Check to see that they two arrays agree on type... 9728166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (T1->getElementType() != T2->getElementType()) 9738166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 9748166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables with different element types need to be linked!"); 9758166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (G1->isConstant() != G2->isConstant()) 9768166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 9778166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables linked with different const'ness!"); 9788166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 9799613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio if (G1->getAlignment() != G2->getAlignment()) 9809613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio return Error(ErrorMsg, 9819613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio "Appending variables with different alignment need to be linked!"); 9829613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio 9839613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio if (G1->getVisibility() != G2->getVisibility()) 9849613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio return Error(ErrorMsg, 9859613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio "Appending variables with different visibility need to be linked!"); 9869613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio 9879613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio if (G1->getSection() != G2->getSection()) 9889613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio return Error(ErrorMsg, 9899613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio "Appending variables with different section name need to be linked!"); 9909613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio 9918166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner unsigned NewSize = T1->getNumElements() + T2->getNumElements(); 9928166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner ArrayType *NewType = ArrayType::get(T1->getElementType(), NewSize); 9938166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 994ed74a4ef3b813bed0c0f4bb5af42229d50133da2Chris Lattner G1->setName(""); // Clear G1's name in case of a conflict! 995ed74a4ef3b813bed0c0f4bb5af42229d50133da2Chris Lattner 9968166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Create the new global variable... 9978166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NG = 9988166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner new GlobalVariable(NewType, G1->isConstant(), G1->getLinkage(), 999c763552299165b88d34a7d4f2d76ff413cbc7f67Lauro Ramos Venancio /*init*/0, First->first, M, G1->isThreadLocal()); 10008166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 10019613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio // Propagate alignment, visibility and section info. 10029613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio CopyGVAttributes(NG, G1); 10039613e871d26f123789d98c61879b4dbe944a6d31Lauro Ramos Venancio 10048166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Merge the initializer... 10058166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.reserve(NewSize); 1006de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if (ConstantArray *I = dyn_cast<ConstantArray>(G1->getInitializer())) { 1007de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i) 1008cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos Inits.push_back(I->getOperand(i)); 1009de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } else { 1010de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner assert(isa<ConstantAggregateZero>(G1->getInitializer())); 1011de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Constant *CV = Constant::getNullValue(T1->getElementType()); 1012de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i) 1013de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(CV); 1014de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } 1015de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if (ConstantArray *I = dyn_cast<ConstantArray>(G2->getInitializer())) { 1016de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i) 1017cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos Inits.push_back(I->getOperand(i)); 1018de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } else { 1019de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner assert(isa<ConstantAggregateZero>(G2->getInitializer())); 1020de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Constant *CV = Constant::getNullValue(T2->getElementType()); 1021de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i) 1022de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(CV); 1023de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } 10248166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner NG->setInitializer(ConstantArray::get(NewType, Inits)); 10258166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.clear(); 10268166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 10278166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Replace any uses of the two global variables with uses of the new 10288166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // global... 10298166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 10308166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // FIXME: This should rewrite simple/straight-forward uses such as 10318166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // getelementptr instructions to not use the Cast! 10324da49122f3f3c8da68a52723d846b88c72166a68Reid Spencer G1->replaceAllUsesWith(ConstantExpr::getBitCast(NG, G1->getType())); 10334da49122f3f3c8da68a52723d846b88c72166a68Reid Spencer G2->replaceAllUsesWith(ConstantExpr::getBitCast(NG, G2->getType())); 10348166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 10358166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Remove the two globals from the module now... 10368166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G1); 10378166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G2); 10388166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 10398166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Put the new global into the AppendingVars map so that we can handle 10408166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // linking of more than two vars... 10418166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Second->second = NG; 10428166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 10438166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.erase(First); 10448166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 10458166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 10468166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return false; 10478166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner} 104852f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 104952f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 105052f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// LinkModules - This function links two modules together, with the resulting 105152f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// left module modified to be the composite of the two input modules. If an 105252f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// error occurs, true is returned and ErrorMsg (if not null) is set to indicate 10535c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// the problem. Upon failure, the Dest module could be in a modified state, and 10545c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// shouldn't be relied on to be consistent. 1055f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukmanbool 10560ba9e211bed7813949aaca97e6b15579c8188e05Reid SpencerLinker::LinkModules(Module *Dest, Module *Src, std::string *ErrorMsg) { 105757a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer assert(Dest != 0 && "Invalid Destination module"); 105857a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer assert(Src != 0 && "Invalid Source Module"); 105957a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 1060c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Dest->getDataLayout().empty()) { 1061c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (!Src->getDataLayout().empty()) { 1062ec9bfdc152a870d3c62377ed6855fb3bff69511cChris Lattner Dest->setDataLayout(Src->getDataLayout()); 1063c36357c406911ded5a0e2924998d885815370fdbChris Lattner } else { 1064c36357c406911ded5a0e2924998d885815370fdbChris Lattner std::string DataLayout; 1065c36357c406911ded5a0e2924998d885815370fdbChris Lattner 1066a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov if (Dest->getEndianness() == Module::AnyEndianness) { 1067c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Src->getEndianness() == Module::BigEndian) 1068c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append("E"); 1069c36357c406911ded5a0e2924998d885815370fdbChris Lattner else if (Src->getEndianness() == Module::LittleEndian) 1070c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append("e"); 1071a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov } 1072a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov 1073a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov if (Dest->getPointerSize() == Module::AnyPointerSize) { 1074c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Src->getPointerSize() == Module::Pointer64) 1075c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append(DataLayout.length() == 0 ? "p:64:64" : "-p:64:64"); 1076c36357c406911ded5a0e2924998d885815370fdbChris Lattner else if (Src->getPointerSize() == Module::Pointer32) 1077c36357c406911ded5a0e2924998d885815370fdbChris Lattner DataLayout.append(DataLayout.length() == 0 ? "p:32:32" : "-p:32:32"); 1078a27694d7aac1bfcec2b776df460719b4a165a79aAnton Korobeynikov } 1079c36357c406911ded5a0e2924998d885815370fdbChris Lattner Dest->setDataLayout(DataLayout); 1080c36357c406911ded5a0e2924998d885815370fdbChris Lattner } 1081c36357c406911ded5a0e2924998d885815370fdbChris Lattner } 1082873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner 1083f27dfcb210fec571d79bc881f5463e0b405707c0Chris Lattner // Copy the target triple from the source to dest if the dest's is empty. 1084c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (Dest->getTargetTriple().empty() && !Src->getTargetTriple().empty()) 1085c36357c406911ded5a0e2924998d885815370fdbChris Lattner Dest->setTargetTriple(Src->getTargetTriple()); 1086c36357c406911ded5a0e2924998d885815370fdbChris Lattner 1087c36357c406911ded5a0e2924998d885815370fdbChris Lattner if (!Src->getDataLayout().empty() && !Dest->getDataLayout().empty() && 1088c36357c406911ded5a0e2924998d885815370fdbChris Lattner Src->getDataLayout() != Dest->getDataLayout()) 108926f238589f9bb372d24b6fb2bc32edbf046fd9eeReid Spencer cerr << "WARNING: Linking two modules of different data layouts!\n"; 1090152f19ac6514ec29e183ddcdf2ea71599638dc4cChris Lattner if (!Src->getTargetTriple().empty() && 1091152f19ac6514ec29e183ddcdf2ea71599638dc4cChris Lattner Dest->getTargetTriple() != Src->getTargetTriple()) 1092e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << "WARNING: Linking two modules of different target triples!\n"; 1093f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 1094f27dfcb210fec571d79bc881f5463e0b405707c0Chris Lattner // Append the module inline asm string. 10956631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner if (!Src->getModuleInlineAsm().empty()) { 10966631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner if (Dest->getModuleInlineAsm().empty()) 10976631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner Dest->setModuleInlineAsm(Src->getModuleInlineAsm()); 1098e1b2e14f92e8e9da1eb4854511a881cf9c22af3cChris Lattner else 10996631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner Dest->setModuleInlineAsm(Dest->getModuleInlineAsm()+"\n"+ 11006631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner Src->getModuleInlineAsm()); 1101e1b2e14f92e8e9da1eb4854511a881cf9c22af3cChris Lattner } 1102e1b2e14f92e8e9da1eb4854511a881cf9c22af3cChris Lattner 1103719012d6254ee425464f034250176283fb96793bReid Spencer // Update the destination module's dependent libraries list with the libraries 110457a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // from the source module. There's no opportunity for duplicates here as the 110557a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // Module ensures that duplicate insertions are discarded. 1106f27dfcb210fec571d79bc881f5463e0b405707c0Chris Lattner for (Module::lib_iterator SI = Src->lib_begin(), SE = Src->lib_end(); 1107f27dfcb210fec571d79bc881f5463e0b405707c0Chris Lattner SI != SE; ++SI) 110857a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer Dest->addLibrary(*SI); 110957a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 11102c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // LinkTypes - Go through the symbol table of the Src module and see if any 11112c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // types are named in the src module that are not named in the Dst module. 11122c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Make sure there are no type name conflicts. 1113619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer if (LinkTypes(Dest, Src, ErrorMsg)) 1114619f024cc315b9edcc6bc71ebea68fd44d85aeafReid Spencer return true; 11152c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 11165c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // ValueMap - Mapping of values from what they used to be in Src, to what they 11175c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // are now in Dest. 11185c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> ValueMap; 11195c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 11208166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars - Keep track of global variables in the destination module 11218166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // with appending linkage. After the module is linked together, they are 11228166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // appended and the module is rewritten. 11238166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> AppendingVars; 11241127315562b221010040925980040fd4f65bdb1cChris Lattner for (Module::global_iterator I = Dest->global_begin(), E = Dest->global_end(); 11251127315562b221010040925980040fd4f65bdb1cChris Lattner I != E; ++I) { 11265a837defff581accc09048bea1cd839009e374a7Chris Lattner // Add all of the appending globals already in the Dest module to 11275a837defff581accc09048bea1cd839009e374a7Chris Lattner // AppendingVars. 1128f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner if (I->hasAppendingLinkage()) 1129f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner AppendingVars.insert(std::make_pair(I->getName(), I)); 11305a837defff581accc09048bea1cd839009e374a7Chris Lattner } 11315a837defff581accc09048bea1cd839009e374a7Chris Lattner 11328166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Insert all of the globals in src into the Dest module... without linking 11338166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers (which could refer to functions not yet mapped over). 1134ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (LinkGlobals(Dest, Src, ValueMap, AppendingVars, ErrorMsg)) 11355a837defff581accc09048bea1cd839009e374a7Chris Lattner return true; 11365c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 1137c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link the functions together between the two modules, without doing function 1138c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // bodies... this just adds external function prototypes to the Dest 1139c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // function... We do this so that when we begin processing function bodies, 1140c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // all of the global values that may be referenced are available in our 1141c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // ValueMap. 1142ef9b9a793949469cdaa4ab6d0173136229dcab7bReid Spencer if (LinkFunctionProtos(Dest, Src, ValueMap, ErrorMsg)) 11435a837defff581accc09048bea1cd839009e374a7Chris Lattner return true; 11445c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 11454fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov // If there were any alias, link them now. We really need to do this now, 11464fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov // because all of the aliases that may be referenced need to be available in 11474fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov // ValueMap 11484fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov if (LinkAlias(Dest, Src, ValueMap, ErrorMsg)) return true; 11494fb2873bb46330da18f413cec661ce2fd0f9f37cAnton Korobeynikov 11506cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // Update the initializers in the Dest module now that all globals that may 11516cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // be referenced are in Dest. 11526cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner if (LinkGlobalInits(Dest, Src, ValueMap, ErrorMsg)) return true; 11536cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner 1154c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link in the function bodies that are defined in the source module into the 1155c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // DestModule. This consists basically of copying the function over and 1156c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // fixing up references to values. 115779df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner if (LinkFunctionBodies(Dest, Src, ValueMap, ErrorMsg)) return true; 115852f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 11598166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If there were any appending global variables, link them together now. 11608166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (LinkAppendingVars(Dest, AppendingVars, ErrorMsg)) return true; 11618166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 116257a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // If the source library's module id is in the dependent library list of the 116357a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // destination library, remove it since that module is now linked in. 116457a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer sys::Path modId; 1165dd04df0ec33a903ee7fc747701bafde622f77d8bReid Spencer modId.set(Src->getModuleIdentifier()); 116607adb2836b8aa7a3872e33c285958f5937662b50Reid Spencer if (!modId.isEmpty()) 116707adb2836b8aa7a3872e33c285958f5937662b50Reid Spencer Dest->removeLibrary(modId.getBasename()); 116857a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 116952f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner return false; 117052f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner} 11719466f5113ba859677a28887c3c7143065e702019Vikram S. Adve 1172567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer// vim: sw=2 1173