LinkModules.cpp revision a54b7cbd452b3adb2f51346140d996b29c2cdb30
17f49602e5ac7186c9505a0496393dd624515b459Reid Spencer//===- lib/Linker/LinkModules.cpp - Module Linker Implementation ----------===// 2f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman// 3b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// The LLVM Compiler Infrastructure 4b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// 5b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// This file was developed by the LLVM research group and is distributed under 6b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// the University of Illinois Open Source 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" 235c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner#include "llvm/SymbolTable.h" 2478d033e086e19e016273de014f9214aa6f3f844bReid Spencer#include "llvm/TypeSymbolTable.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 2720033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner// RemapOperand - Use ValueMap to convert references from one module to another. 2730033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner// This is somewhat sophisticated in that it can automatically handle constant 274620fd68b1086b4d99b23951357299bee357aa62aChris Lattner// references correctly as well. 2755c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic Value *RemapOperand(const Value *In, 2760033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner std::map<const Value*, Value*> &ValueMap) { 2770033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner std::map<const Value*,Value*>::const_iterator I = ValueMap.find(In); 2780033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner if (I != ValueMap.end()) return I->second; 2795c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 2800033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner // Check to see if it's a constant that we are interesting in transforming. 281620fd68b1086b4d99b23951357299bee357aa62aChris Lattner Value *Result = 0; 28218961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (const Constant *CPV = dyn_cast<Constant>(In)) { 283de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if ((!isa<DerivedType>(CPV->getType()) && !isa<ConstantExpr>(CPV)) || 284a54b7cbd452b3adb2f51346140d996b29c2cdb30Reid Spencer isa<ConstantInt>(CPV) || isa<ConstantAggregateZero>(CPV)) 2850033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner return const_cast<Constant*>(CPV); // Simple constants stay identical. 2868d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 28718961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (const ConstantArray *CPA = dyn_cast<ConstantArray>(CPV)) { 288cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos std::vector<Constant*> Operands(CPA->getNumOperands()); 289cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i) 2900033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner Operands[i] =cast<Constant>(RemapOperand(CPA->getOperand(i), ValueMap)); 291e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Result = ConstantArray::get(cast<ArrayType>(CPA->getType()), Operands); 29218961504fc2b299578dba817900a0696cf3ccc4dChris Lattner } else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(CPV)) { 293cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos std::vector<Constant*> Operands(CPS->getNumOperands()); 294cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i) 2950033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner Operands[i] =cast<Constant>(RemapOperand(CPS->getOperand(i), ValueMap)); 296e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Result = ConstantStruct::get(cast<StructType>(CPS->getType()), Operands); 297b976e668165e1875a8f1eb7af800e33bb1e4393dChris Lattner } else if (isa<ConstantPointerNull>(CPV) || isa<UndefValue>(CPV)) { 29818961504fc2b299578dba817900a0696cf3ccc4dChris Lattner Result = const_cast<Constant*>(CPV); 29900dc4796132933e76fe2b834ca087e42621c175aReid Spencer } else if (isa<GlobalValue>(CPV)) { 3000033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner Result = cast<Constant>(RemapOperand(CPV, ValueMap)); 301a88eb9287eb14ba62ca6324b2b249e0ae9fe3309Chris Lattner } else if (const ConstantPacked *CP = dyn_cast<ConstantPacked>(CPV)) { 302a88eb9287eb14ba62ca6324b2b249e0ae9fe3309Chris Lattner std::vector<Constant*> Operands(CP->getNumOperands()); 303a88eb9287eb14ba62ca6324b2b249e0ae9fe3309Chris Lattner for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i) 304a88eb9287eb14ba62ca6324b2b249e0ae9fe3309Chris Lattner Operands[i] = cast<Constant>(RemapOperand(CP->getOperand(i), ValueMap)); 305a88eb9287eb14ba62ca6324b2b249e0ae9fe3309Chris Lattner Result = ConstantPacked::get(Operands); 3066cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) { 30727d672136a57519095a3ef20161697749cffb57cChris Lattner std::vector<Constant*> Ops; 30827d672136a57519095a3ef20161697749cffb57cChris Lattner for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i) 30927d672136a57519095a3ef20161697749cffb57cChris Lattner Ops.push_back(cast<Constant>(RemapOperand(CE->getOperand(i),ValueMap))); 31027d672136a57519095a3ef20161697749cffb57cChris Lattner Result = CE->getWithOperands(Ops); 3118d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } else { 3128d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner assert(0 && "Unknown type of derived type constant value!"); 3138d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 314620fd68b1086b4d99b23951357299bee357aa62aChris Lattner } else if (isa<InlineAsm>(In)) { 315620fd68b1086b4d99b23951357299bee357aa62aChris Lattner Result = const_cast<Value*>(In); 316620fd68b1086b4d99b23951357299bee357aa62aChris Lattner } 317620fd68b1086b4d99b23951357299bee357aa62aChris Lattner 318620fd68b1086b4d99b23951357299bee357aa62aChris Lattner // Cache the mapping in our local map structure... 319620fd68b1086b4d99b23951357299bee357aa62aChris Lattner if (Result) { 3200033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner ValueMap.insert(std::make_pair(In, Result)); 3218d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return Result; 3228d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 323620fd68b1086b4d99b23951357299bee357aa62aChris Lattner 3242d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 325e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << "LinkModules ValueMap: \n"; 3260033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner PrintMap(ValueMap); 3272d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 328e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << "Couldn't remap value: " << (void*)In << " " << *In << "\n"; 3298d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner assert(0 && "Couldn't remap value!"); 3308d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return 0; 3315c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 3325c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 333c003628a612d3687fb77088a5894314210a65385Chris Lattner/// ForceRenaming - The LLVM SymbolTable class autorenames globals that conflict 334c003628a612d3687fb77088a5894314210a65385Chris Lattner/// in the symbol table. This is good for all clients except for us. Go 335c003628a612d3687fb77088a5894314210a65385Chris Lattner/// through the trouble to force this back. 336c003628a612d3687fb77088a5894314210a65385Chris Lattnerstatic void ForceRenaming(GlobalValue *GV, const std::string &Name) { 337c003628a612d3687fb77088a5894314210a65385Chris Lattner assert(GV->getName() != Name && "Can't force rename to self"); 33878d033e086e19e016273de014f9214aa6f3f844bReid Spencer SymbolTable &ST = GV->getParent()->getValueSymbolTable(); 339c003628a612d3687fb77088a5894314210a65385Chris Lattner 340c003628a612d3687fb77088a5894314210a65385Chris Lattner // If there is a conflict, rename the conflict. 341c003628a612d3687fb77088a5894314210a65385Chris Lattner Value *ConflictVal = ST.lookup(GV->getType(), Name); 342c003628a612d3687fb77088a5894314210a65385Chris Lattner assert(ConflictVal&&"Why do we have to force rename if there is no conflic?"); 343c003628a612d3687fb77088a5894314210a65385Chris Lattner GlobalValue *ConflictGV = cast<GlobalValue>(ConflictVal); 344c003628a612d3687fb77088a5894314210a65385Chris Lattner assert(ConflictGV->hasInternalLinkage() && 345c003628a612d3687fb77088a5894314210a65385Chris Lattner "Not conflicting with a static global, should link instead!"); 346c003628a612d3687fb77088a5894314210a65385Chris Lattner 347c003628a612d3687fb77088a5894314210a65385Chris Lattner ConflictGV->setName(""); // Eliminate the conflict 348c003628a612d3687fb77088a5894314210a65385Chris Lattner GV->setName(Name); // Force the name back 349c003628a612d3687fb77088a5894314210a65385Chris Lattner ConflictGV->setName(Name); // This will cause ConflictGV to get renamed 3507b0c84dcf59b6ac3a27843fd8162ab36928fba35Chris Lattner assert(GV->getName() == Name && ConflictGV->getName() != Name && 351c003628a612d3687fb77088a5894314210a65385Chris Lattner "ForceRenaming didn't work"); 352c003628a612d3687fb77088a5894314210a65385Chris Lattner} 353c003628a612d3687fb77088a5894314210a65385Chris Lattner 354aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// GetLinkageResult - This analyzes the two global values and determines what 355aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// the result will look like in the destination module. In particular, it 356aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// computes the resultant linkage type, computes whether the global in the 357aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// source should be copied over to the destination (replacing the existing 358aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// one), and computes whether this linkage is an error or not. 359aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattnerstatic bool GetLinkageResult(GlobalValue *Dest, GlobalValue *Src, 360aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner GlobalValue::LinkageTypes <, bool &LinkFromSrc, 361aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner std::string *Err) { 362aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner assert((!Dest || !Src->hasInternalLinkage()) && 363aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "If Src has internal linkage, Dest shouldn't be set!"); 364aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (!Dest) { 365aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // Linking something to nothing. 366aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 367aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 368aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else if (Src->isExternal()) { 369aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // If Src is external or if both Src & Drc are external.. Just link the 370aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // external globals, we aren't adding anything. 371b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov if (Src->hasDLLImportLinkage()) { 37278ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // If one of GVs has DLLImport linkage, result should be dllimport'ed. 373b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov if (Dest->isExternal()) { 374b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LinkFromSrc = true; 375b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LT = Src->getLinkage(); 376b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } 3778753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth } else if (Dest->hasExternalWeakLinkage()) { 3788753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth //If the Dest is weak, use the source linkage 3798753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth LinkFromSrc = true; 3808753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth LT = Src->getLinkage(); 381b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } else { 382b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LinkFromSrc = false; 383b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov LT = Dest->getLinkage(); 384b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } 385b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } else if (Dest->isExternal() && !Dest->hasDLLImportLinkage()) { 386aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // If Dest is external but Src is not: 387aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 388aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 389aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else if (Src->hasAppendingLinkage() || Dest->hasAppendingLinkage()) { 390aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (Src->getLinkage() != Dest->getLinkage()) 391aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner return Error(Err, "Linking globals named '" + Src->getName() + 392aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "': can only link appending global with another appending global!"); 393aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; // Special cased. 394aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 395aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else if (Src->hasWeakLinkage() || Src->hasLinkOnceLinkage()) { 39678ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // At this point we know that Dest has LinkOnce, External*, Weak, DLL* linkage. 39778ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov if ((Dest->hasLinkOnceLinkage() && Src->hasWeakLinkage()) || 39878ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Dest->hasExternalWeakLinkage()) { 399aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 400aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 401aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else { 402aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = false; 403aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Dest->getLinkage(); 404aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 405aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else if (Dest->hasWeakLinkage() || Dest->hasLinkOnceLinkage()) { 40678ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // At this point we know that Src has External* or DLL* linkage. 40778ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov if (Src->hasExternalWeakLinkage()) { 40878ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LinkFromSrc = false; 40978ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LT = Dest->getLinkage(); 41078ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov } else { 41178ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LinkFromSrc = true; 41278ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov LT = GlobalValue::ExternalLinkage; 41378ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov } 414aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else { 415b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov assert((Dest->hasExternalLinkage() || 416b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov Dest->hasDLLImportLinkage() || 41778ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Dest->hasDLLExportLinkage() || 41878ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Dest->hasExternalWeakLinkage()) && 419b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov (Src->hasExternalLinkage() || 420b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov Src->hasDLLImportLinkage() || 42178ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Src->hasDLLExportLinkage() || 42278ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov Src->hasExternalWeakLinkage()) && 423aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "Unexpected linkage type!"); 424f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman return Error(Err, "Linking globals named '" + Src->getName() + 425aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "': symbol multiply defined!"); 426aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 427aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner return false; 428aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner} 4295c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4305c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// LinkGlobals - Loop through the global variables in the src module and merge 4318166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// them into the dest module. 432aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattnerstatic bool LinkGlobals(Module *Dest, Module *Src, 4335c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 4348166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 4355a837defff581accc09048bea1cd839009e374a7Chris Lattner std::map<std::string, GlobalValue*> &GlobalsByName, 4365c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 4375c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // We will need a module level symbol table if the src module has a module 4385c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // level symbol table... 43978d033e086e19e016273de014f9214aa6f3f844bReid Spencer TypeSymbolTable *TST = &Dest->getTypeSymbolTable(); 440f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 4415c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 4421127315562b221010040925980040fd4f65bdb1cChris Lattner for (Module::global_iterator I = Src->global_begin(), E = Src->global_end(); 4431127315562b221010040925980040fd4f65bdb1cChris Lattner I != E; ++I) { 444aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner GlobalVariable *SGV = I; 4454ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner GlobalVariable *DGV = 0; 4465a837defff581accc09048bea1cd839009e374a7Chris Lattner // Check to see if may have to link the global. 447aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner if (SGV->hasName() && !SGV->hasInternalLinkage()) 448aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner if (!(DGV = Dest->getGlobalVariable(SGV->getName(), 449aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner SGV->getType()->getElementType()))) { 450aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner std::map<std::string, GlobalValue*>::iterator EGV = 451aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner GlobalsByName.find(SGV->getName()); 452aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner if (EGV != GlobalsByName.end()) 453aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner DGV = dyn_cast<GlobalVariable>(EGV->second); 454aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (DGV) 455aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // If types don't agree due to opaque types, try to resolve them. 45678d033e086e19e016273de014f9214aa6f3f844bReid Spencer RecursiveResolveTypes(SGV->getType(), DGV->getType(), TST, ""); 457aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner } 4585c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 459aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (DGV && DGV->hasInternalLinkage()) 460aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner DGV = 0; 461aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner 4628753c447a5f8eec1421331c40ffbb72c6d411f78Andrew Lenharth assert(SGV->hasInitializer() || SGV->hasExternalWeakLinkage() || 463b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov SGV->hasExternalLinkage() || SGV->hasDLLImportLinkage() && 4644ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner "Global must either be external or have an initializer!"); 4655c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 466b324bd735ff5c99a52cd3c3f5d01c0e1398a2d3aChris Lattner GlobalValue::LinkageTypes NewLinkage = GlobalValue::InternalLinkage; 467b324bd735ff5c99a52cd3c3f5d01c0e1398a2d3aChris Lattner bool LinkFromSrc = false; 468aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (GetLinkageResult(DGV, SGV, NewLinkage, LinkFromSrc, Err)) 469aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner return true; 4700fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner 471aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (!DGV) { 4725c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // No linking to be performed, simply create an identical version of the 4738d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // symbol over in the dest module... the initializer will be filled in 4748d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // later by LinkGlobalInits... 4752719bac90525985f4ebb97324b4c087d47b54384Chris Lattner GlobalVariable *NewDGV = 4762719bac90525985f4ebb97324b4c087d47b54384Chris Lattner new GlobalVariable(SGV->getType()->getElementType(), 4772719bac90525985f4ebb97324b4c087d47b54384Chris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 4782719bac90525985f4ebb97324b4c087d47b54384Chris Lattner SGV->getName(), Dest); 4791127315562b221010040925980040fd4f65bdb1cChris Lattner // Propagate alignment info. 4801127315562b221010040925980040fd4f65bdb1cChris Lattner NewDGV->setAlignment(SGV->getAlignment()); 4811127315562b221010040925980040fd4f65bdb1cChris Lattner 4822719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // If the LLVM runtime renamed the global, but it is an externally visible 4832719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // symbol, DGV must be an existing global with internal linkage. Rename 4842719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // it. 485c003628a612d3687fb77088a5894314210a65385Chris Lattner if (NewDGV->getName() != SGV->getName() && !NewDGV->hasInternalLinkage()) 486c003628a612d3687fb77088a5894314210a65385Chris Lattner ForceRenaming(NewDGV, SGV->getName()); 4875c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4885c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Make sure to remember this mapping... 4892719bac90525985f4ebb97324b4c087d47b54384Chris Lattner ValueMap.insert(std::make_pair(SGV, NewDGV)); 4908166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (SGV->hasAppendingLinkage()) 4918166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Keep track that this is an appending variable... 4928166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV)); 493aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else if (DGV->hasAppendingLinkage()) { 4948166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // No linking is performed yet. Just insert a new copy of the global, and 4958166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // keep track of the fact that it is an appending variable in the 4968166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars map. The name is cleared out so that no linkage is 4978166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // performed. 4988166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NewDGV = 4998166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner new GlobalVariable(SGV->getType()->getElementType(), 5008166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 5018166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "", Dest); 5028166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 5031127315562b221010040925980040fd4f65bdb1cChris Lattner // Propagate alignment info. 5041127315562b221010040925980040fd4f65bdb1cChris Lattner NewDGV->setAlignment(std::max(DGV->getAlignment(), SGV->getAlignment())); 5051127315562b221010040925980040fd4f65bdb1cChris Lattner 5068166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Make sure to remember this mapping... 5078166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner ValueMap.insert(std::make_pair(SGV, NewDGV)); 5088166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 5098166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Keep track that this is an appending variable... 5108166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV)); 5114ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else { 5121127315562b221010040925980040fd4f65bdb1cChris Lattner // Propagate alignment info. 5131127315562b221010040925980040fd4f65bdb1cChris Lattner DGV->setAlignment(std::max(DGV->getAlignment(), SGV->getAlignment())); 5141127315562b221010040925980040fd4f65bdb1cChris Lattner 515aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // Otherwise, perform the mapping as instructed by GetLinkageResult. If 516aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // the types don't match, and if we are to link from the source, nuke DGV 517aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // and create a new one of the appropriate type. 518aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (SGV->getType() != DGV->getType() && LinkFromSrc) { 519aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner GlobalVariable *NewDGV = 520aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner new GlobalVariable(SGV->getType()->getElementType(), 521aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner DGV->isConstant(), DGV->getLinkage()); 5221127315562b221010040925980040fd4f65bdb1cChris Lattner NewDGV->setAlignment(DGV->getAlignment()); 523aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner Dest->getGlobalList().insert(DGV, NewDGV); 5244da49122f3f3c8da68a52723d846b88c72166a68Reid Spencer DGV->replaceAllUsesWith( 5254da49122f3f3c8da68a52723d846b88c72166a68Reid Spencer ConstantExpr::getBitCast(NewDGV, DGV->getType())); 526aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner DGV->eraseFromParent(); 527aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner NewDGV->setName(SGV->getName()); 528aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner DGV = NewDGV; 529aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 530aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner 531aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner DGV->setLinkage(NewLinkage); 532aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner 533aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (LinkFromSrc) { 534aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // Inherit const as appropriate 535e6f8c5a71682ffcc33d3c83a40821ded8f2c8033Chris Lattner DGV->setConstant(SGV->isConstant()); 536aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner DGV->setInitializer(0); 537aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else { 538aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (SGV->isConstant() && !DGV->isConstant()) { 539e6f8c5a71682ffcc33d3c83a40821ded8f2c8033Chris Lattner if (DGV->isExternal()) 540aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner DGV->setConstant(true); 541aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 542c8ef1edc63508d21bf8e38112fc125cde01fdbb9Chris Lattner SGV->setLinkage(GlobalValue::ExternalLinkage); 543c8ef1edc63508d21bf8e38112fc125cde01fdbb9Chris Lattner SGV->setInitializer(0); 544aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 545aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner 5464da49122f3f3c8da68a52723d846b88c72166a68Reid Spencer ValueMap.insert( 5474da49122f3f3c8da68a52723d846b88c72166a68Reid Spencer std::make_pair(SGV, ConstantExpr::getBitCast(DGV, SGV->getType()))); 5485c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 5495c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 5505c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 5515c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 5525c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 5535c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 5548d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// LinkGlobalInits - Update the initializers in the Dest module now that all 5558d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// globals that may be referenced are in Dest. 5568d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattnerstatic bool LinkGlobalInits(Module *Dest, const Module *Src, 5575c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 5585c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 5598d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 5608d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 5611127315562b221010040925980040fd4f65bdb1cChris Lattner for (Module::const_global_iterator I = Src->global_begin(), 5621127315562b221010040925980040fd4f65bdb1cChris Lattner E = Src->global_end(); I != E; ++I) { 56318961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const GlobalVariable *SGV = I; 5648d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 5658d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner if (SGV->hasInitializer()) { // Only process initialized GV's 5668d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Figure out what the initializer looks like in the dest module... 5674ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner Constant *SInit = 5680033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner cast<Constant>(RemapOperand(SGV->getInitializer(), ValueMap)); 5698d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 570f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman GlobalVariable *DGV = cast<GlobalVariable>(ValueMap[SGV]); 5714ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (DGV->hasInitializer()) { 5724ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (SGV->hasExternalLinkage()) { 5734ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (DGV->getInitializer() != SInit) 574f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman return Error(Err, "Global Variable Collision on '" + 57572cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattner ToStr(SGV->getType(), Src) +"':%"+SGV->getName()+ 5764ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner " - Global variables have different initializers"); 57772ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner } else if (DGV->hasLinkOnceLinkage() || DGV->hasWeakLinkage()) { 5784ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // Nothing is required, mapped values will take the new global 5794ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // automatically. 58057cb9883aa4c82357594d4186858f175135be3b1Chris Lattner } else if (SGV->hasLinkOnceLinkage() || SGV->hasWeakLinkage()) { 58157cb9883aa4c82357594d4186858f175135be3b1Chris Lattner // Nothing is required, mapped values will take the new global 58257cb9883aa4c82357594d4186858f175135be3b1Chris Lattner // automatically. 5834ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else if (DGV->hasAppendingLinkage()) { 5844ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(0 && "Appending linkage unimplemented!"); 5854ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else { 5864ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(0 && "Unknown linkage!"); 5874ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } 5888d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } else { 5898d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Copy the initializer over now... 5904ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner DGV->setInitializer(SInit); 5918d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 5928d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 5938d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 5948d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return false; 5958d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner} 5965c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 59779df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner// LinkFunctionProtos - Link the functions together between the two modules, 598c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// without doing function bodies... this just adds external function prototypes 599c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// to the Dest function... 6005c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 60179df7c0aaa18129e55968c8783ef8346807bd4afChris Lattnerstatic bool LinkFunctionProtos(Module *Dest, const Module *Src, 6025c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 60378d033e086e19e016273de014f9214aa6f3f844bReid Spencer std::map<std::string, 60478d033e086e19e016273de014f9214aa6f3f844bReid Spencer GlobalValue*> &GlobalsByName, 6055c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 60678d033e086e19e016273de014f9214aa6f3f844bReid Spencer TypeSymbolTable *TST = &Dest->getTypeSymbolTable(); 607f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 608c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Loop over all of the functions in the src module, mapping them over as we 609c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // go 6105c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner for (Module::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) { 61118961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const Function *SF = I; // SrcFunction 6124ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner Function *DF = 0; 6135a837defff581accc09048bea1cd839009e374a7Chris Lattner if (SF->hasName() && !SF->hasInternalLinkage()) { 6145a837defff581accc09048bea1cd839009e374a7Chris Lattner // Check to see if may have to link the function. 615aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner if (!(DF = Dest->getFunction(SF->getName(), SF->getFunctionType()))) { 616aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner std::map<std::string, GlobalValue*>::iterator EF = 617aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner GlobalsByName.find(SF->getName()); 618aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner if (EF != GlobalsByName.end()) 619aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner DF = dyn_cast<Function>(EF->second); 62078d033e086e19e016273de014f9214aa6f3f844bReid Spencer if (DF && RecursiveResolveTypes(SF->getType(), DF->getType(), TST, "")) 621aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner DF = 0; // FIXME: gross. 622aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner } 6235a837defff581accc09048bea1cd839009e374a7Chris Lattner } 6245c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 6254ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (!DF || SF->hasInternalLinkage() || DF->hasInternalLinkage()) { 6260fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner // Function does not already exist, simply insert an function signature 6270fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner // identical to SF into the dest module... 6282719bac90525985f4ebb97324b4c087d47b54384Chris Lattner Function *NewDF = new Function(SF->getFunctionType(), SF->getLinkage(), 6292719bac90525985f4ebb97324b4c087d47b54384Chris Lattner SF->getName(), Dest); 630cb9048a6e813ca0c89f59375f3aa15ae49e153b4Chris Lattner NewDF->setCallingConv(SF->getCallingConv()); 6312719bac90525985f4ebb97324b4c087d47b54384Chris Lattner 6322719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // If the LLVM runtime renamed the function, but it is an externally 6332719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // visible symbol, DF must be an existing function with internal linkage. 6342719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // Rename it. 635c003628a612d3687fb77088a5894314210a65385Chris Lattner if (NewDF->getName() != SF->getName() && !NewDF->hasInternalLinkage()) 63682b5b219dd3b9035442389ddcd58e6f859aae039Chris Lattner ForceRenaming(NewDF, SF->getName()); 6374ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner 6384ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // ... and remember this mapping... 6392719bac90525985f4ebb97324b4c087d47b54384Chris Lattner ValueMap.insert(std::make_pair(SF, NewDF)); 640c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SF->isExternal()) { 641c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // If SF is external or if both SF & DF are external.. Just link the 642c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // external functions, we aren't adding anything. 643b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov if (SF->hasDLLImportLinkage()) { 644b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov if (DF->isExternal()) { 645b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov ValueMap.insert(std::make_pair(SF, DF)); 646b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov DF->setLinkage(SF->getLinkage()); 647b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } 648b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } else { 649b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov ValueMap.insert(std::make_pair(SF, DF)); 650b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } 651b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov } else if (DF->isExternal() && !DF->hasDLLImportLinkage()) { 652b74ed07bfd3af42331b1964c24c39912610a08f4Anton Korobeynikov // If DF is external but SF is not... 653c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // Link the external functions, update linkage qualifiers 654c2b97d43a074445c6856d69538a95de09450c26eChris Lattner ValueMap.insert(std::make_pair(SF, DF)); 655c2b97d43a074445c6856d69538a95de09450c26eChris Lattner DF->setLinkage(SF->getLinkage()); 65635956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner } else if (SF->hasWeakLinkage() || SF->hasLinkOnceLinkage()) { 65778ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // At this point we know that DF has LinkOnce, Weak, or External* linkage. 65872ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner ValueMap.insert(std::make_pair(SF, DF)); 65972ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner 66035956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner // Linkonce+Weak = Weak 66178ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // *+External Weak = * 66278ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov if ((DF->hasLinkOnceLinkage() && SF->hasWeakLinkage()) || 66378ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov DF->hasExternalWeakLinkage()) 66435956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner DF->setLinkage(SF->getLinkage()); 66535956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner 66678ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov 66735956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner } else if (DF->hasWeakLinkage() || DF->hasLinkOnceLinkage()) { 66878ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // At this point we know that SF has LinkOnce or External* linkage. 66972ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner ValueMap.insert(std::make_pair(SF, DF)); 67078ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov if (!SF->hasLinkOnceLinkage() && !SF->hasExternalWeakLinkage()) 67178ee7b78c3c47b71c4b7a1475438d6574216a64bAnton Korobeynikov // Don't inherit linkonce & external weak linkage 67272ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner DF->setLinkage(SF->getLinkage()); 673c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SF->getLinkage() != DF->getLinkage()) { 6740fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner return Error(Err, "Functions named '" + SF->getName() + 6750fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner "' have different linkage specifiers!"); 676c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SF->hasExternalLinkage()) { 677c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // The function is defined in both modules!! 678f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman return Error(Err, "Function '" + 679f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman ToStr(SF->getFunctionType(), Src) + "':\"" + 680c2b97d43a074445c6856d69538a95de09450c26eChris Lattner SF->getName() + "\" - Function is already defined!"); 681c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else { 682c2b97d43a074445c6856d69538a95de09450c26eChris Lattner assert(0 && "Unknown linkage configuration found!"); 6835c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 6845c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 6855c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 6865c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 6875c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 688c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBody - Copy the source function over into the dest function and 689c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// fix up references to values. At this point we know that Dest is an external 690c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function, and that Src is not. 6914bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattnerstatic bool LinkFunctionBody(Function *Dest, Function *Src, 6925c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &GlobalMap, 6935c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 6945c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner assert(Src && Dest && Dest->isExternal() && !Src->isExternal()); 6955c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 6960033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner // Go through and convert function arguments over, remembering the mapping. 697e4d5c441e04bdc00ccf1804744af670655123b07Chris Lattner Function::arg_iterator DI = Dest->arg_begin(); 698e4d5c441e04bdc00ccf1804744af670655123b07Chris Lattner for (Function::arg_iterator I = Src->arg_begin(), E = Src->arg_end(); 69969da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner I != E; ++I, ++DI) { 70069da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner DI->setName(I->getName()); // Copy the name information over... 7015c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 7025c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Add a mapping to our local map 7030033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner GlobalMap.insert(std::make_pair(I, DI)); 7045c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 7055c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 7064bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner // Splice the body of the source function into the dest function. 7074bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner Dest->getBasicBlockList().splice(Dest->end(), Src->getBasicBlockList()); 7085c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 709c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // At this point, all of the instructions and values of the function are now 710c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // copied over. The only problem is that they are still referencing values in 711c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // the Source function as operands. Loop through all of the operands of the 712c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // functions and patch them up to point to the local versions... 7135c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 71418961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Function::iterator BB = Dest->begin(), BE = Dest->end(); BB != BE; ++BB) 71518961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) 71618961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Instruction::op_iterator OI = I->op_begin(), OE = I->op_end(); 717221d688a5ef21a22c2368c9fff0e92d7966c95e5Chris Lattner OI != OE; ++OI) 7184bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner if (!isa<Instruction>(*OI) && !isa<BasicBlock>(*OI)) 7190033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner *OI = RemapOperand(*OI, GlobalMap); 7200033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner 7210033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner // There is no need to map the arguments anymore. 7221127315562b221010040925980040fd4f65bdb1cChris Lattner for (Function::arg_iterator I = Src->arg_begin(), E = Src->arg_end(); 7231127315562b221010040925980040fd4f65bdb1cChris Lattner I != E; ++I) 7240033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner GlobalMap.erase(I); 7255c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 7265c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 7275c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 7285c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 7295c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 730c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBodies - Link in the function bodies that are defined in the 731c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// source module into the DestModule. This consists basically of copying the 732c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function over and fixing up references to values. 7334bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattnerstatic bool LinkFunctionBodies(Module *Dest, Module *Src, 7345c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 7355c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 7365c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 737c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Loop over all of the functions in the src module, mapping them over as we 738c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // go 7394bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner for (Module::iterator SF = Src->begin(), E = Src->end(); SF != E; ++SF) { 74018961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (!SF->isExternal()) { // No body if function is external 74118961504fc2b299578dba817900a0696cf3ccc4dChris Lattner Function *DF = cast<Function>(ValueMap[SF]); // Destination function 742c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner 74318961504fc2b299578dba817900a0696cf3ccc4dChris Lattner // DF not external SF external? 74435956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner if (DF->isExternal()) { 74535956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner // Only provide the function body if there isn't one already. 74635956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner if (LinkFunctionBody(DF, SF, ValueMap, Err)) 74735956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner return true; 748c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner } 749c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner } 7505c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 7515c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 7525c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 7535c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 7548166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// LinkAppendingVars - If there were any appending global variables, link them 7558166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// together now. Return true on error. 7568166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattnerstatic bool LinkAppendingVars(Module *M, 7578166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 7588166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::string *ErrorMsg) { 7598166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (AppendingVars.empty()) return false; // Nothing to do. 760f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 7618166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Loop over the multimap of appending vars, processing any variables with the 7628166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // same name, forming a new appending global variable with both of the 7638166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers merged together, then rewrite references to the old variables 7648166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // and delete them. 7658166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::vector<Constant*> Inits; 7668166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner while (AppendingVars.size() > 1) { 7678166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Get the first two elements in the map... 7688166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, 7698166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable*>::iterator Second = AppendingVars.begin(), First=Second++; 7708166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 7718166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If the first two elements are for different names, there is no pair... 7728166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Otherwise there is a pair, so link them together... 7738166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (First->first == Second->first) { 7748166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *G1 = First->second, *G2 = Second->second; 7758166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T1 = cast<ArrayType>(G1->getType()->getElementType()); 7768166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T2 = cast<ArrayType>(G2->getType()->getElementType()); 777f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 7788166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Check to see that they two arrays agree on type... 7798166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (T1->getElementType() != T2->getElementType()) 7808166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 7818166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables with different element types need to be linked!"); 7828166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (G1->isConstant() != G2->isConstant()) 7838166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 7848166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables linked with different const'ness!"); 7858166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 7868166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner unsigned NewSize = T1->getNumElements() + T2->getNumElements(); 7878166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner ArrayType *NewType = ArrayType::get(T1->getElementType(), NewSize); 7888166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 789ed74a4ef3b813bed0c0f4bb5af42229d50133da2Chris Lattner G1->setName(""); // Clear G1's name in case of a conflict! 790ed74a4ef3b813bed0c0f4bb5af42229d50133da2Chris Lattner 7918166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Create the new global variable... 7928166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NG = 7938166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner new GlobalVariable(NewType, G1->isConstant(), G1->getLinkage(), 7948166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner /*init*/0, First->first, M); 7958166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 7968166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Merge the initializer... 7978166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.reserve(NewSize); 798de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if (ConstantArray *I = dyn_cast<ConstantArray>(G1->getInitializer())) { 799de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i) 800cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos Inits.push_back(I->getOperand(i)); 801de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } else { 802de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner assert(isa<ConstantAggregateZero>(G1->getInitializer())); 803de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Constant *CV = Constant::getNullValue(T1->getElementType()); 804de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i) 805de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(CV); 806de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } 807de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if (ConstantArray *I = dyn_cast<ConstantArray>(G2->getInitializer())) { 808de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i) 809cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos Inits.push_back(I->getOperand(i)); 810de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } else { 811de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner assert(isa<ConstantAggregateZero>(G2->getInitializer())); 812de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Constant *CV = Constant::getNullValue(T2->getElementType()); 813de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i) 814de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(CV); 815de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } 8168166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner NG->setInitializer(ConstantArray::get(NewType, Inits)); 8178166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.clear(); 8188166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8198166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Replace any uses of the two global variables with uses of the new 8208166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // global... 8218166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8228166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // FIXME: This should rewrite simple/straight-forward uses such as 8238166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // getelementptr instructions to not use the Cast! 8244da49122f3f3c8da68a52723d846b88c72166a68Reid Spencer G1->replaceAllUsesWith(ConstantExpr::getBitCast(NG, G1->getType())); 8254da49122f3f3c8da68a52723d846b88c72166a68Reid Spencer G2->replaceAllUsesWith(ConstantExpr::getBitCast(NG, G2->getType())); 8268166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8278166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Remove the two globals from the module now... 8288166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G1); 8298166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G2); 8308166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8318166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Put the new global into the AppendingVars map so that we can handle 8328166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // linking of more than two vars... 8338166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Second->second = NG; 8348166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 8358166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.erase(First); 8368166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 8378166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8388166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return false; 8398166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner} 84052f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 84152f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 84252f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// LinkModules - This function links two modules together, with the resulting 84352f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// left module modified to be the composite of the two input modules. If an 84452f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// error occurs, true is returned and ErrorMsg (if not null) is set to indicate 8455c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// the problem. Upon failure, the Dest module could be in a modified state, and 8465c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// shouldn't be relied on to be consistent. 847f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukmanbool 8480ba9e211bed7813949aaca97e6b15579c8188e05Reid SpencerLinker::LinkModules(Module *Dest, Module *Src, std::string *ErrorMsg) { 84957a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer assert(Dest != 0 && "Invalid Destination module"); 85057a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer assert(Src != 0 && "Invalid Source Module"); 85157a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 852873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner if (Dest->getEndianness() == Module::AnyEndianness) 853873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner Dest->setEndianness(Src->getEndianness()); 854873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner if (Dest->getPointerSize() == Module::AnyPointerSize) 855873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner Dest->setPointerSize(Src->getPointerSize()); 856152f19ac6514ec29e183ddcdf2ea71599638dc4cChris Lattner if (Dest->getTargetTriple().empty()) 857152f19ac6514ec29e183ddcdf2ea71599638dc4cChris Lattner Dest->setTargetTriple(Src->getTargetTriple()); 858873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner 859873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner if (Src->getEndianness() != Module::AnyEndianness && 860873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner Dest->getEndianness() != Src->getEndianness()) 861e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << "WARNING: Linking two modules of different endianness!\n"; 862873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner if (Src->getPointerSize() != Module::AnyPointerSize && 863873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner Dest->getPointerSize() != Src->getPointerSize()) 864e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << "WARNING: Linking two modules of different pointer size!\n"; 865152f19ac6514ec29e183ddcdf2ea71599638dc4cChris Lattner if (!Src->getTargetTriple().empty() && 866152f19ac6514ec29e183ddcdf2ea71599638dc4cChris Lattner Dest->getTargetTriple() != Src->getTargetTriple()) 867e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling cerr << "WARNING: Linking two modules of different target triples!\n"; 868f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 8696631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner if (!Src->getModuleInlineAsm().empty()) { 8706631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner if (Dest->getModuleInlineAsm().empty()) 8716631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner Dest->setModuleInlineAsm(Src->getModuleInlineAsm()); 872e1b2e14f92e8e9da1eb4854511a881cf9c22af3cChris Lattner else 8736631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner Dest->setModuleInlineAsm(Dest->getModuleInlineAsm()+"\n"+ 8746631601eeda2300abdce11fbd7a7a3daa2694d39Chris Lattner Src->getModuleInlineAsm()); 875e1b2e14f92e8e9da1eb4854511a881cf9c22af3cChris Lattner } 876e1b2e14f92e8e9da1eb4854511a881cf9c22af3cChris Lattner 877719012d6254ee425464f034250176283fb96793bReid Spencer // Update the destination module's dependent libraries list with the libraries 87857a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // from the source module. There's no opportunity for duplicates here as the 87957a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // Module ensures that duplicate insertions are discarded. 88057a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer Module::lib_iterator SI = Src->lib_begin(); 88157a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer Module::lib_iterator SE = Src->lib_end(); 88257a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer while ( SI != SE ) { 88357a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer Dest->addLibrary(*SI); 88457a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer ++SI; 88557a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer } 88657a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 8872c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // LinkTypes - Go through the symbol table of the Src module and see if any 8882c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // types are named in the src module that are not named in the Dst module. 8892c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Make sure there are no type name conflicts. 8902c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner if (LinkTypes(Dest, Src, ErrorMsg)) return true; 8912c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 8925c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // ValueMap - Mapping of values from what they used to be in Src, to what they 8935c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // are now in Dest. 8945c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> ValueMap; 8955c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 8968166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars - Keep track of global variables in the destination module 8978166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // with appending linkage. After the module is linked together, they are 8988166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // appended and the module is rewritten. 8998166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> AppendingVars; 9008166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 9015a837defff581accc09048bea1cd839009e374a7Chris Lattner // GlobalsByName - The LLVM SymbolTable class fights our best efforts at 9025a837defff581accc09048bea1cd839009e374a7Chris Lattner // linking by separating globals by type. Until PR411 is fixed, we replicate 9035a837defff581accc09048bea1cd839009e374a7Chris Lattner // it's functionality here. 9045a837defff581accc09048bea1cd839009e374a7Chris Lattner std::map<std::string, GlobalValue*> GlobalsByName; 9055a837defff581accc09048bea1cd839009e374a7Chris Lattner 9061127315562b221010040925980040fd4f65bdb1cChris Lattner for (Module::global_iterator I = Dest->global_begin(), E = Dest->global_end(); 9071127315562b221010040925980040fd4f65bdb1cChris Lattner I != E; ++I) { 9085a837defff581accc09048bea1cd839009e374a7Chris Lattner // Add all of the appending globals already in the Dest module to 9095a837defff581accc09048bea1cd839009e374a7Chris Lattner // AppendingVars. 910f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner if (I->hasAppendingLinkage()) 911f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner AppendingVars.insert(std::make_pair(I->getName(), I)); 9128166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 9135a837defff581accc09048bea1cd839009e374a7Chris Lattner // Keep track of all globals by name. 9145a837defff581accc09048bea1cd839009e374a7Chris Lattner if (!I->hasInternalLinkage() && I->hasName()) 9155a837defff581accc09048bea1cd839009e374a7Chris Lattner GlobalsByName[I->getName()] = I; 9165a837defff581accc09048bea1cd839009e374a7Chris Lattner } 9175a837defff581accc09048bea1cd839009e374a7Chris Lattner 9185a837defff581accc09048bea1cd839009e374a7Chris Lattner // Keep track of all globals by name. 9195a837defff581accc09048bea1cd839009e374a7Chris Lattner for (Module::iterator I = Dest->begin(), E = Dest->end(); I != E; ++I) 9205a837defff581accc09048bea1cd839009e374a7Chris Lattner if (!I->hasInternalLinkage() && I->hasName()) 9215a837defff581accc09048bea1cd839009e374a7Chris Lattner GlobalsByName[I->getName()] = I; 9225a837defff581accc09048bea1cd839009e374a7Chris Lattner 9238166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Insert all of the globals in src into the Dest module... without linking 9248166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers (which could refer to functions not yet mapped over). 9255a837defff581accc09048bea1cd839009e374a7Chris Lattner if (LinkGlobals(Dest, Src, ValueMap, AppendingVars, GlobalsByName, ErrorMsg)) 9265a837defff581accc09048bea1cd839009e374a7Chris Lattner return true; 9275c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 928c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link the functions together between the two modules, without doing function 929c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // bodies... this just adds external function prototypes to the Dest 930c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // function... We do this so that when we begin processing function bodies, 931c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // all of the global values that may be referenced are available in our 932c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // ValueMap. 9335a837defff581accc09048bea1cd839009e374a7Chris Lattner if (LinkFunctionProtos(Dest, Src, ValueMap, GlobalsByName, ErrorMsg)) 9345a837defff581accc09048bea1cd839009e374a7Chris Lattner return true; 9355c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 9366cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // Update the initializers in the Dest module now that all globals that may 9376cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // be referenced are in Dest. 9386cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner if (LinkGlobalInits(Dest, Src, ValueMap, ErrorMsg)) return true; 9396cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner 940c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link in the function bodies that are defined in the source module into the 941c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // DestModule. This consists basically of copying the function over and 942c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // fixing up references to values. 94379df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner if (LinkFunctionBodies(Dest, Src, ValueMap, ErrorMsg)) return true; 94452f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 9458166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If there were any appending global variables, link them together now. 9468166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (LinkAppendingVars(Dest, AppendingVars, ErrorMsg)) return true; 9478166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 94857a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // If the source library's module id is in the dependent library list of the 94957a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // destination library, remove it since that module is now linked in. 95057a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer sys::Path modId; 951dd04df0ec33a903ee7fc747701bafde622f77d8bReid Spencer modId.set(Src->getModuleIdentifier()); 95207adb2836b8aa7a3872e33c285958f5937662b50Reid Spencer if (!modId.isEmpty()) 95307adb2836b8aa7a3872e33c285958f5937662b50Reid Spencer Dest->removeLibrary(modId.getBasename()); 95457a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 95552f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner return false; 95652f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner} 9579466f5113ba859677a28887c3c7143065e702019Vikram S. Adve 958567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer// vim: sw=2 959