LinkModules.cpp revision ed74a4ef3b813bed0c0f4bb5af42229d50133da2
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" 2447b14a4a6a455c7be169cfd312fcbe796f0ad426Misha Brukman#include "llvm/Instructions.h" 25adbc0b5287bf36893cdcae2440d48b3cb3489e38Chris Lattner#include "llvm/Assembly/Writer.h" 2657a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer#include "llvm/System/Path.h" 27c28a224c68adf0464c275778af4bce762ad25d37Reid Spencer#include <iostream> 2872cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattner#include <sstream> 29f7703df4968084c18c248c1feea9961c19a32e6aChris Lattnerusing namespace llvm; 30d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke 315c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// Error - Simple wrapper function to conditionally assign to E and return true. 325c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// This just makes error return conditions a little bit simpler... 338166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattnerstatic inline bool Error(std::string *E, const std::string &Message) { 345c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner if (E) *E = Message; 355c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return true; 365c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 375c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 38719012d6254ee425464f034250176283fb96793bReid Spencer// ToStr - Simple wrapper function to convert a type to a string. 3972cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattnerstatic std::string ToStr(const Type *Ty, const Module *M) { 4072cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattner std::ostringstream OS; 4172cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattner WriteTypeSymbolic(OS, Ty, M); 4272cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattner return OS.str(); 4372cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattner} 4472cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattner 45700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 46700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Function: ResolveTypes() 47700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 48700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Description: 49700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Attempt to link the two specified types together. 50700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 51700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Inputs: 52700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// DestTy - The type to which we wish to resolve. 53700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// SrcTy - The original type which we want to resolve. 54700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Name - The name of the type. 55700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 56700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Outputs: 57700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// DestST - The symbol table in which the new type should be placed. 58700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 59700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Return value: 60700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// true - There is an error and the types cannot yet be linked. 61700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// false - No errors. 624c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner// 63e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattnerstatic bool ResolveTypes(const Type *DestTy, const Type *SrcTy, 64e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner SymbolTable *DestST, const std::string &Name) { 65e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DestTy == SrcTy) return false; // If already equal, noop 66e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 674c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Does the type already exist in the module? 684c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (DestTy && !isa<OpaqueType>(DestTy)) { // Yup, the type already exists... 69e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (const OpaqueType *OT = dyn_cast<OpaqueType>(SrcTy)) { 70e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner const_cast<OpaqueType*>(OT)->refineAbstractTypeTo(DestTy); 714c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } else { 724c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner return true; // Cannot link types... neither is opaque and not-equal 734c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 744c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } else { // Type not in dest module. Add it now. 754c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (DestTy) // Type _is_ in module, just opaque... 76e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner const_cast<OpaqueType*>(cast<OpaqueType>(DestTy)) 77e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner ->refineAbstractTypeTo(SrcTy); 78fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner else if (!Name.empty()) 79e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner DestST->insert(Name, const_cast<Type*>(SrcTy)); 804c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 814c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner return false; 824c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner} 834c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 8443f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattnerstatic const FunctionType *getFT(const PATypeHolder &TH) { 8543f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return cast<FunctionType>(TH.get()); 8643f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner} 879732be769e57f1dec03f046ab957053048f60e40Chris Lattnerstatic const StructType *getST(const PATypeHolder &TH) { 8843f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return cast<StructType>(TH.get()); 8943f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner} 90e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 91e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// RecursiveResolveTypes - This is just like ResolveTypes, except that it 92e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// recurses down into derived types, merging the used types if the parent types 93e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// are compatible. 94e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattnerstatic bool RecursiveResolveTypesI(const PATypeHolder &DestTy, 95e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner const PATypeHolder &SrcTy, 96e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner SymbolTable *DestST, const std::string &Name, 97e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner std::vector<std::pair<PATypeHolder, PATypeHolder> > &Pointers) { 9843f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner const Type *SrcTyT = SrcTy.get(); 9943f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner const Type *DestTyT = DestTy.get(); 10043f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner if (DestTyT == SrcTyT) return false; // If already equal, noop 101f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 102e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // If we found our opaque type, resolve it now! 10343f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner if (isa<OpaqueType>(DestTyT) || isa<OpaqueType>(SrcTyT)) 10443f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return ResolveTypes(DestTyT, SrcTyT, DestST, Name); 105f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 106e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Two types cannot be resolved together if they are of different primitive 107e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // type. For example, we cannot resolve an int to a float. 108f70c22b019494723d0e706f93d6542dfaa6e73a5Chris Lattner if (DestTyT->getTypeID() != SrcTyT->getTypeID()) return true; 109e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 110e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Otherwise, resolve the used type used by this derived type... 111f70c22b019494723d0e706f93d6542dfaa6e73a5Chris Lattner switch (DestTyT->getTypeID()) { 112e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::FunctionTyID: { 11343f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner if (cast<FunctionType>(DestTyT)->isVarArg() != 114841e00b96295a2b66cb7573e961656d28a6cb12bChris Lattner cast<FunctionType>(SrcTyT)->isVarArg() || 115841e00b96295a2b66cb7573e961656d28a6cb12bChris Lattner cast<FunctionType>(DestTyT)->getNumContainedTypes() != 116841e00b96295a2b66cb7573e961656d28a6cb12bChris Lattner cast<FunctionType>(SrcTyT)->getNumContainedTypes()) 11743f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return true; 11843f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner for (unsigned i = 0, e = getFT(DestTy)->getNumContainedTypes(); i != e; ++i) 119e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner if (RecursiveResolveTypesI(getFT(DestTy)->getContainedType(i), 120e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner getFT(SrcTy)->getContainedType(i), DestST, "", 121e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner Pointers)) 122e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return true; 123e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return false; 124e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 125e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::StructTyID: { 126f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman if (getST(DestTy)->getNumContainedTypes() != 12743f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner getST(SrcTy)->getNumContainedTypes()) return 1; 12843f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner for (unsigned i = 0, e = getST(DestTy)->getNumContainedTypes(); i != e; ++i) 129e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner if (RecursiveResolveTypesI(getST(DestTy)->getContainedType(i), 130e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner getST(SrcTy)->getContainedType(i), DestST, "", 131e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner Pointers)) 132e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return true; 133e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return false; 134e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 135e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::ArrayTyID: { 13643f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner const ArrayType *DAT = cast<ArrayType>(DestTy.get()); 13743f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner const ArrayType *SAT = cast<ArrayType>(SrcTy.get()); 138e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DAT->getNumElements() != SAT->getNumElements()) return true; 139e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner return RecursiveResolveTypesI(DAT->getElementType(), SAT->getElementType(), 140e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner DestST, "", Pointers); 141e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner } 142e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner case Type::PointerTyID: { 143e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // If this is a pointer type, check to see if we have already seen it. If 144e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // so, we are in a recursive branch. Cut off the search now. We cannot use 145e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // an associative container for this search, because the type pointers (keys 146e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // in the container) change whenever types get resolved... 147e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner for (unsigned i = 0, e = Pointers.size(); i != e; ++i) 148e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner if (Pointers[i].first == DestTy) 149e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner return Pointers[i].second != SrcTy; 150e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner 151e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // Otherwise, add the current pointers to the vector to stop recursion on 152e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // this pair. 153e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner Pointers.push_back(std::make_pair(DestTyT, SrcTyT)); 154e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner bool Result = 155e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner RecursiveResolveTypesI(cast<PointerType>(DestTy.get())->getElementType(), 156e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner cast<PointerType>(SrcTy.get())->getElementType(), 157e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner DestST, "", Pointers); 158e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner Pointers.pop_back(); 159e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner return Result; 160e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 161e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner default: assert(0 && "Unexpected type!"); return true; 162f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman } 163e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner} 164e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 165e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattnerstatic bool RecursiveResolveTypes(const PATypeHolder &DestTy, 166e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner const PATypeHolder &SrcTy, 167e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner SymbolTable *DestST, const std::string &Name){ 168e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner std::vector<std::pair<PATypeHolder, PATypeHolder> > PointerTypes; 169e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner return RecursiveResolveTypesI(DestTy, SrcTy, DestST, Name, PointerTypes); 170e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner} 171e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner 172e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 1732c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// LinkTypes - Go through the symbol table of the Src module and see if any 1742c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// types are named in the src module that are not named in the Dst module. 1752c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// Make sure there are no type name conflicts. 1765c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic bool LinkTypes(Module *Dest, const Module *Src, std::string *Err) { 1776e6026b46569b01f8f6d4dcdb6c899c3a9c76b3eChris Lattner SymbolTable *DestST = &Dest->getSymbolTable(); 1786e6026b46569b01f8f6d4dcdb6c899c3a9c76b3eChris Lattner const SymbolTable *SrcST = &Src->getSymbolTable(); 1792c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 1802c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Look for a type plane for Type's... 181567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer SymbolTable::type_const_iterator TI = SrcST->type_begin(); 182567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer SymbolTable::type_const_iterator TE = SrcST->type_end(); 183567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer if (TI == TE) return false; // No named types, do nothing. 1842c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 185cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // Some types cannot be resolved immediately because they depend on other 186cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // types being resolved to each other first. This contains a list of types we 187cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // are waiting to recheck. 1884c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner std::vector<std::string> DelayedTypesToResolve; 1894c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 190567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer for ( ; TI != TE; ++TI ) { 191567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer const std::string &Name = TI->first; 192c28a224c68adf0464c275778af4bce762ad25d37Reid Spencer const Type *RHS = TI->second; 1932c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 1942c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Check to see if this type name is already in the dest module... 195567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer Type *Entry = DestST->lookupType(Name); 1964c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 1974c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (ResolveTypes(Entry, RHS, DestST, Name)) { 1984c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // They look different, save the types 'till later to resolve. 1994c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner DelayedTypesToResolve.push_back(Name); 2004c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 2014c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 2024c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 2034c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Iteratively resolve types while we can... 2044c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner while (!DelayedTypesToResolve.empty()) { 2054c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Loop over all of the types, attempting to resolve them if possible... 2064c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner unsigned OldSize = DelayedTypesToResolve.size(); 2074c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 208e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Try direct resolution by name... 2094c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner for (unsigned i = 0; i != DelayedTypesToResolve.size(); ++i) { 2104c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner const std::string &Name = DelayedTypesToResolve[i]; 211567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer Type *T1 = SrcST->lookupType(Name); 212567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer Type *T2 = DestST->lookupType(Name); 2134c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (!ResolveTypes(T2, T1, DestST, Name)) { 2144c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // We are making progress! 2154c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i); 2164c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner --i; 2172f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner } 2184c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 2192f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner 2204c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Did we not eliminate any types? 2214c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (DelayedTypesToResolve.size() == OldSize) { 222e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Attempt to resolve subelements of types. This allows us to merge these 223e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // two types: { int* } and { opaque* } 2244c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner for (unsigned i = 0, e = DelayedTypesToResolve.size(); i != e; ++i) { 2254c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner const std::string &Name = DelayedTypesToResolve[i]; 226567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer PATypeHolder T1(SrcST->lookupType(Name)); 227567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer PATypeHolder T2(DestST->lookupType(Name)); 228e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 229e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (!RecursiveResolveTypes(T2, T1, DestST, Name)) { 230e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // We are making progress! 231e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i); 232f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 233e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Go back to the main loop, perhaps we can resolve directly by name 234e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // now... 235e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner break; 236e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 237e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 238e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 239e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // If we STILL cannot resolve the types, then there is something wrong. 240e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DelayedTypesToResolve.size() == OldSize) { 241aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner // Remove the symbol name from the destination. 242aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner DelayedTypesToResolve.pop_back(); 2434c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 2442c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner } 2452c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner } 2464c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 2474c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 2482c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner return false; 2492c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner} 2502c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 2515c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic void PrintMap(const std::map<const Value*, Value*> &M) { 2525c2d335d86579941b71816196a95a64b277e8963Chris Lattner for (std::map<const Value*, Value*>::const_iterator I = M.begin(), E =M.end(); 2532d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner I != E; ++I) { 2545c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << " Fr: " << (void*)I->first << " "; 25587182ae6baf28ca6da6ee4bc00cf1857f293acfeChris Lattner I->first->dump(); 2565c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << " To: " << (void*)I->second << " "; 25787182ae6baf28ca6da6ee4bc00cf1857f293acfeChris Lattner I->second->dump(); 2585c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << "\n"; 2592d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner } 2602d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner} 2612d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 2622d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 2630033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner// RemapOperand - Use ValueMap to convert references from one module to another. 2640033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner// This is somewhat sophisticated in that it can automatically handle constant 2650033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner// references correctly as well... 2665c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic Value *RemapOperand(const Value *In, 2670033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner std::map<const Value*, Value*> &ValueMap) { 2680033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner std::map<const Value*,Value*>::const_iterator I = ValueMap.find(In); 2690033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner if (I != ValueMap.end()) return I->second; 2705c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 2710033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner // Check to see if it's a constant that we are interesting in transforming. 27218961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (const Constant *CPV = dyn_cast<Constant>(In)) { 273de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if ((!isa<DerivedType>(CPV->getType()) && !isa<ConstantExpr>(CPV)) || 274de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner isa<ConstantAggregateZero>(CPV)) 2750033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner return const_cast<Constant*>(CPV); // Simple constants stay identical. 2768d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 277e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Constant *Result = 0; 2788d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 27918961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (const ConstantArray *CPA = dyn_cast<ConstantArray>(CPV)) { 280cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos std::vector<Constant*> Operands(CPA->getNumOperands()); 281cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i) 2820033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner Operands[i] =cast<Constant>(RemapOperand(CPA->getOperand(i), ValueMap)); 283e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Result = ConstantArray::get(cast<ArrayType>(CPA->getType()), Operands); 28418961504fc2b299578dba817900a0696cf3ccc4dChris Lattner } else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(CPV)) { 285cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos std::vector<Constant*> Operands(CPS->getNumOperands()); 286cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i) 2870033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner Operands[i] =cast<Constant>(RemapOperand(CPS->getOperand(i), ValueMap)); 288e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Result = ConstantStruct::get(cast<StructType>(CPS->getType()), Operands); 289b976e668165e1875a8f1eb7af800e33bb1e4393dChris Lattner } else if (isa<ConstantPointerNull>(CPV) || isa<UndefValue>(CPV)) { 29018961504fc2b299578dba817900a0696cf3ccc4dChris Lattner Result = const_cast<Constant*>(CPV); 29100dc4796132933e76fe2b834ca087e42621c175aReid Spencer } else if (isa<GlobalValue>(CPV)) { 2920033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner Result = cast<Constant>(RemapOperand(CPV, ValueMap)); 2936cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) { 294b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner if (CE->getOpcode() == Instruction::GetElementPtr) { 2950033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner Value *Ptr = RemapOperand(CE->getOperand(0), ValueMap); 296b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner std::vector<Constant*> Indices; 297b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner Indices.reserve(CE->getNumOperands()-1); 298b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i) 299b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner Indices.push_back(cast<Constant>(RemapOperand(CE->getOperand(i), 3000033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner ValueMap))); 301b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner 302b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner Result = ConstantExpr::getGetElementPtr(cast<Constant>(Ptr), Indices); 303b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner } else if (CE->getNumOperands() == 1) { 304ad333484ea5ae976b83e35ccd3f6cfa6e71290e2Chris Lattner // Cast instruction 305ad333484ea5ae976b83e35ccd3f6cfa6e71290e2Chris Lattner assert(CE->getOpcode() == Instruction::Cast); 3060033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner Value *V = RemapOperand(CE->getOperand(0), ValueMap); 307ad333484ea5ae976b83e35ccd3f6cfa6e71290e2Chris Lattner Result = ConstantExpr::getCast(cast<Constant>(V), CE->getType()); 3081438102576b94d6dac9bb18e8df291c4d632572dChris Lattner } else if (CE->getNumOperands() == 3) { 3091438102576b94d6dac9bb18e8df291c4d632572dChris Lattner // Select instruction 3101438102576b94d6dac9bb18e8df291c4d632572dChris Lattner assert(CE->getOpcode() == Instruction::Select); 3110033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner Value *V1 = RemapOperand(CE->getOperand(0), ValueMap); 3120033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner Value *V2 = RemapOperand(CE->getOperand(1), ValueMap); 3130033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner Value *V3 = RemapOperand(CE->getOperand(2), ValueMap); 3141438102576b94d6dac9bb18e8df291c4d632572dChris Lattner Result = ConstantExpr::getSelect(cast<Constant>(V1), cast<Constant>(V2), 3151438102576b94d6dac9bb18e8df291c4d632572dChris Lattner cast<Constant>(V3)); 3166cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } else if (CE->getNumOperands() == 2) { 3176cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // Binary operator... 3180033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner Value *V1 = RemapOperand(CE->getOperand(0), ValueMap); 3190033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner Value *V2 = RemapOperand(CE->getOperand(1), ValueMap); 3206cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner 3216cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner Result = ConstantExpr::get(CE->getOpcode(), cast<Constant>(V1), 322d981f8af79be9ea647d593531091740a3a27a85fChris Lattner cast<Constant>(V2)); 3236cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } else { 324b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner assert(0 && "Unknown constant expr type!"); 3256cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } 3266cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner 3278d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } else { 3288d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner assert(0 && "Unknown type of derived type constant value!"); 3298d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 3308d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 3318d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Cache the mapping in our local map structure... 3320033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner ValueMap.insert(std::make_pair(In, Result)); 3338d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return Result; 3348d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 3352d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 3360033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner std::cerr << "LinkModules ValueMap: \n"; 3370033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner PrintMap(ValueMap); 3382d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 3395c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << "Couldn't remap value: " << (void*)In << " " << *In << "\n"; 3408d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner assert(0 && "Couldn't remap value!"); 3418d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return 0; 3425c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 3435c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 344c003628a612d3687fb77088a5894314210a65385Chris Lattner/// ForceRenaming - The LLVM SymbolTable class autorenames globals that conflict 345c003628a612d3687fb77088a5894314210a65385Chris Lattner/// in the symbol table. This is good for all clients except for us. Go 346c003628a612d3687fb77088a5894314210a65385Chris Lattner/// through the trouble to force this back. 347c003628a612d3687fb77088a5894314210a65385Chris Lattnerstatic void ForceRenaming(GlobalValue *GV, const std::string &Name) { 348c003628a612d3687fb77088a5894314210a65385Chris Lattner assert(GV->getName() != Name && "Can't force rename to self"); 349c003628a612d3687fb77088a5894314210a65385Chris Lattner SymbolTable &ST = GV->getParent()->getSymbolTable(); 350c003628a612d3687fb77088a5894314210a65385Chris Lattner 351c003628a612d3687fb77088a5894314210a65385Chris Lattner // If there is a conflict, rename the conflict. 352c003628a612d3687fb77088a5894314210a65385Chris Lattner Value *ConflictVal = ST.lookup(GV->getType(), Name); 353c003628a612d3687fb77088a5894314210a65385Chris Lattner assert(ConflictVal&&"Why do we have to force rename if there is no conflic?"); 354c003628a612d3687fb77088a5894314210a65385Chris Lattner GlobalValue *ConflictGV = cast<GlobalValue>(ConflictVal); 355c003628a612d3687fb77088a5894314210a65385Chris Lattner assert(ConflictGV->hasInternalLinkage() && 356c003628a612d3687fb77088a5894314210a65385Chris Lattner "Not conflicting with a static global, should link instead!"); 357c003628a612d3687fb77088a5894314210a65385Chris Lattner 358c003628a612d3687fb77088a5894314210a65385Chris Lattner ConflictGV->setName(""); // Eliminate the conflict 359c003628a612d3687fb77088a5894314210a65385Chris Lattner GV->setName(Name); // Force the name back 360c003628a612d3687fb77088a5894314210a65385Chris Lattner ConflictGV->setName(Name); // This will cause ConflictGV to get renamed 3617b0c84dcf59b6ac3a27843fd8162ab36928fba35Chris Lattner assert(GV->getName() == Name && ConflictGV->getName() != Name && 362c003628a612d3687fb77088a5894314210a65385Chris Lattner "ForceRenaming didn't work"); 363c003628a612d3687fb77088a5894314210a65385Chris Lattner} 364c003628a612d3687fb77088a5894314210a65385Chris Lattner 365aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// GetLinkageResult - This analyzes the two global values and determines what 366aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// the result will look like in the destination module. In particular, it 367aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// computes the resultant linkage type, computes whether the global in the 368aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// source should be copied over to the destination (replacing the existing 369aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner/// one), and computes whether this linkage is an error or not. 370aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattnerstatic bool GetLinkageResult(GlobalValue *Dest, GlobalValue *Src, 371aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner GlobalValue::LinkageTypes <, bool &LinkFromSrc, 372aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner std::string *Err) { 373aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner assert((!Dest || !Src->hasInternalLinkage()) && 374aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "If Src has internal linkage, Dest shouldn't be set!"); 375aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (!Dest) { 376aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // Linking something to nothing. 377aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 378aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 379aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else if (Src->isExternal()) { 380aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // If Src is external or if both Src & Drc are external.. Just link the 381aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // external globals, we aren't adding anything. 382aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = false; 383aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Dest->getLinkage(); 384aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else if (Dest->isExternal()) { 385aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // If Dest is external but Src is not: 386aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 387aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 388aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else if (Src->hasAppendingLinkage() || Dest->hasAppendingLinkage()) { 389aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (Src->getLinkage() != Dest->getLinkage()) 390aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner return Error(Err, "Linking globals named '" + Src->getName() + 391aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "': can only link appending global with another appending global!"); 392aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; // Special cased. 393aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 394aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else if (Src->hasWeakLinkage() || Src->hasLinkOnceLinkage()) { 395aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // At this point we know that Dest has LinkOnce, External or Weak linkage. 396aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (Dest->hasLinkOnceLinkage() && Src->hasWeakLinkage()) { 397aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 398aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Src->getLinkage(); 399aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else { 400aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = false; 401aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = Dest->getLinkage(); 402aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 403aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else if (Dest->hasWeakLinkage() || Dest->hasLinkOnceLinkage()) { 404aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // At this point we know that Src has External linkage. 405aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LinkFromSrc = true; 406aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner LT = GlobalValue::ExternalLinkage; 407aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else { 408aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner assert(Dest->hasExternalLinkage() && Src->hasExternalLinkage() && 409aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "Unexpected linkage type!"); 410f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman return Error(Err, "Linking globals named '" + Src->getName() + 411aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner "': symbol multiply defined!"); 412aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 413aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner return false; 414aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner} 4155c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4165c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// LinkGlobals - Loop through the global variables in the src module and merge 4178166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// them into the dest module. 418aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattnerstatic bool LinkGlobals(Module *Dest, Module *Src, 4195c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 4208166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 4215a837defff581accc09048bea1cd839009e374a7Chris Lattner std::map<std::string, GlobalValue*> &GlobalsByName, 4225c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 4235c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // We will need a module level symbol table if the src module has a module 4245c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // level symbol table... 425b91b657e026e86082b665cc875c2881ed075b68dChris Lattner SymbolTable *ST = (SymbolTable*)&Dest->getSymbolTable(); 426f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 4275c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 428e4d5c441e04bdc00ccf1804744af670655123b07Chris Lattner for (Module::global_iterator I = Src->global_begin(), E = Src->global_end(); I != E; ++I) { 429aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner GlobalVariable *SGV = I; 4304ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner GlobalVariable *DGV = 0; 4315a837defff581accc09048bea1cd839009e374a7Chris Lattner // Check to see if may have to link the global. 432aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner if (SGV->hasName() && !SGV->hasInternalLinkage()) 433aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner if (!(DGV = Dest->getGlobalVariable(SGV->getName(), 434aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner SGV->getType()->getElementType()))) { 435aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner std::map<std::string, GlobalValue*>::iterator EGV = 436aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner GlobalsByName.find(SGV->getName()); 437aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner if (EGV != GlobalsByName.end()) 438aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner DGV = dyn_cast<GlobalVariable>(EGV->second); 439aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (DGV) 440aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // If types don't agree due to opaque types, try to resolve them. 441aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner RecursiveResolveTypes(SGV->getType(), DGV->getType(),ST, ""); 442aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner } 4435c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 444aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (DGV && DGV->hasInternalLinkage()) 445aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner DGV = 0; 446aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner 4474ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(SGV->hasInitializer() || SGV->hasExternalLinkage() && 4484ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner "Global must either be external or have an initializer!"); 4495c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 450aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner GlobalValue::LinkageTypes NewLinkage; 451aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner bool LinkFromSrc; 452aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (GetLinkageResult(DGV, SGV, NewLinkage, LinkFromSrc, Err)) 453aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner return true; 4540fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner 455aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (!DGV) { 4565c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // No linking to be performed, simply create an identical version of the 4578d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // symbol over in the dest module... the initializer will be filled in 4588d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // later by LinkGlobalInits... 4592719bac90525985f4ebb97324b4c087d47b54384Chris Lattner GlobalVariable *NewDGV = 4602719bac90525985f4ebb97324b4c087d47b54384Chris Lattner new GlobalVariable(SGV->getType()->getElementType(), 4612719bac90525985f4ebb97324b4c087d47b54384Chris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 4622719bac90525985f4ebb97324b4c087d47b54384Chris Lattner SGV->getName(), Dest); 4632719bac90525985f4ebb97324b4c087d47b54384Chris Lattner 4642719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // If the LLVM runtime renamed the global, but it is an externally visible 4652719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // symbol, DGV must be an existing global with internal linkage. Rename 4662719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // it. 467c003628a612d3687fb77088a5894314210a65385Chris Lattner if (NewDGV->getName() != SGV->getName() && !NewDGV->hasInternalLinkage()) 468c003628a612d3687fb77088a5894314210a65385Chris Lattner ForceRenaming(NewDGV, SGV->getName()); 4695c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4705c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Make sure to remember this mapping... 4712719bac90525985f4ebb97324b4c087d47b54384Chris Lattner ValueMap.insert(std::make_pair(SGV, NewDGV)); 4728166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (SGV->hasAppendingLinkage()) 4738166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Keep track that this is an appending variable... 4748166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV)); 475aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else if (DGV->hasAppendingLinkage()) { 4768166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // No linking is performed yet. Just insert a new copy of the global, and 4778166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // keep track of the fact that it is an appending variable in the 4788166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars map. The name is cleared out so that no linkage is 4798166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // performed. 4808166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NewDGV = 4818166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner new GlobalVariable(SGV->getType()->getElementType(), 4828166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 4838166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "", Dest); 4848166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 4858166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Make sure to remember this mapping... 4868166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner ValueMap.insert(std::make_pair(SGV, NewDGV)); 4878166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 4888166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Keep track that this is an appending variable... 4898166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV)); 4904ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else { 491aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // Otherwise, perform the mapping as instructed by GetLinkageResult. If 492aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // the types don't match, and if we are to link from the source, nuke DGV 493aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // and create a new one of the appropriate type. 494aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (SGV->getType() != DGV->getType() && LinkFromSrc) { 495aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner GlobalVariable *NewDGV = 496aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner new GlobalVariable(SGV->getType()->getElementType(), 497aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner DGV->isConstant(), DGV->getLinkage()); 498aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner Dest->getGlobalList().insert(DGV, NewDGV); 499aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner DGV->replaceAllUsesWith(ConstantExpr::getCast(NewDGV, DGV->getType())); 500aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner DGV->eraseFromParent(); 501aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner NewDGV->setName(SGV->getName()); 502aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner DGV = NewDGV; 503aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 504aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner 505aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner DGV->setLinkage(NewLinkage); 506aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner 507aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (LinkFromSrc) { 508aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner // Inherit const as appropriate 509e6f8c5a71682ffcc33d3c83a40821ded8f2c8033Chris Lattner DGV->setConstant(SGV->isConstant()); 510aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner DGV->setInitializer(0); 511aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } else { 512aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner if (SGV->isConstant() && !DGV->isConstant()) { 513e6f8c5a71682ffcc33d3c83a40821ded8f2c8033Chris Lattner if (DGV->isExternal()) 514aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner DGV->setConstant(true); 515aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 516c8ef1edc63508d21bf8e38112fc125cde01fdbb9Chris Lattner SGV->setLinkage(GlobalValue::ExternalLinkage); 517c8ef1edc63508d21bf8e38112fc125cde01fdbb9Chris Lattner SGV->setInitializer(0); 518aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner } 519aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner 520aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner ValueMap.insert(std::make_pair(SGV, 521aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner ConstantExpr::getCast(DGV, 522aee38ea5698fd770bb41d01d06542cb849e131a4Chris Lattner SGV->getType()))); 5235c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 5245c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 5255c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 5265c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 5275c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 5285c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 5298d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// LinkGlobalInits - Update the initializers in the Dest module now that all 5308d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// globals that may be referenced are in Dest. 5318d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattnerstatic bool LinkGlobalInits(Module *Dest, const Module *Src, 5325c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 5335c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 5348d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 5358d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 536e4d5c441e04bdc00ccf1804744af670655123b07Chris Lattner for (Module::const_global_iterator I = Src->global_begin(), E = Src->global_end(); I != E; ++I){ 53718961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const GlobalVariable *SGV = I; 5388d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 5398d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner if (SGV->hasInitializer()) { // Only process initialized GV's 5408d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Figure out what the initializer looks like in the dest module... 5414ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner Constant *SInit = 5420033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner cast<Constant>(RemapOperand(SGV->getInitializer(), ValueMap)); 5438d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 544f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman GlobalVariable *DGV = cast<GlobalVariable>(ValueMap[SGV]); 5454ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (DGV->hasInitializer()) { 5464ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (SGV->hasExternalLinkage()) { 5474ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (DGV->getInitializer() != SInit) 548f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman return Error(Err, "Global Variable Collision on '" + 54972cf7df6a364c213a94d01e1f0f8d918940c8416Chris Lattner ToStr(SGV->getType(), Src) +"':%"+SGV->getName()+ 5504ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner " - Global variables have different initializers"); 55172ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner } else if (DGV->hasLinkOnceLinkage() || DGV->hasWeakLinkage()) { 5524ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // Nothing is required, mapped values will take the new global 5534ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // automatically. 55457cb9883aa4c82357594d4186858f175135be3b1Chris Lattner } else if (SGV->hasLinkOnceLinkage() || SGV->hasWeakLinkage()) { 55557cb9883aa4c82357594d4186858f175135be3b1Chris Lattner // Nothing is required, mapped values will take the new global 55657cb9883aa4c82357594d4186858f175135be3b1Chris Lattner // automatically. 5574ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else if (DGV->hasAppendingLinkage()) { 5584ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(0 && "Appending linkage unimplemented!"); 5594ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else { 5604ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(0 && "Unknown linkage!"); 5614ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } 5628d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } else { 5638d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Copy the initializer over now... 5644ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner DGV->setInitializer(SInit); 5658d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 5668d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 5678d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 5688d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return false; 5698d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner} 5705c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 57179df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner// LinkFunctionProtos - Link the functions together between the two modules, 572c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// without doing function bodies... this just adds external function prototypes 573c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// to the Dest function... 5745c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 57579df7c0aaa18129e55968c8783ef8346807bd4afChris Lattnerstatic bool LinkFunctionProtos(Module *Dest, const Module *Src, 5765c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 5775a837defff581accc09048bea1cd839009e374a7Chris Lattner std::map<std::string, GlobalValue*> &GlobalsByName, 5785c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 579b91b657e026e86082b665cc875c2881ed075b68dChris Lattner SymbolTable *ST = (SymbolTable*)&Dest->getSymbolTable(); 580f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 581c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Loop over all of the functions in the src module, mapping them over as we 582c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // go 5835c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner for (Module::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) { 58418961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const Function *SF = I; // SrcFunction 5854ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner Function *DF = 0; 5865a837defff581accc09048bea1cd839009e374a7Chris Lattner if (SF->hasName() && !SF->hasInternalLinkage()) { 5875a837defff581accc09048bea1cd839009e374a7Chris Lattner // Check to see if may have to link the function. 588aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner if (!(DF = Dest->getFunction(SF->getName(), SF->getFunctionType()))) { 589aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner std::map<std::string, GlobalValue*>::iterator EF = 590aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner GlobalsByName.find(SF->getName()); 591aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner if (EF != GlobalsByName.end()) 592aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner DF = dyn_cast<Function>(EF->second); 593aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner if (DF && RecursiveResolveTypes(SF->getType(), DF->getType(), ST, "")) 594aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner DF = 0; // FIXME: gross. 595aad2deb17c3e624cae4ebc1ed51fc5264fa1c0b8Chris Lattner } 5965a837defff581accc09048bea1cd839009e374a7Chris Lattner } 5975c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 5984ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (!DF || SF->hasInternalLinkage() || DF->hasInternalLinkage()) { 5990fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner // Function does not already exist, simply insert an function signature 6000fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner // identical to SF into the dest module... 6012719bac90525985f4ebb97324b4c087d47b54384Chris Lattner Function *NewDF = new Function(SF->getFunctionType(), SF->getLinkage(), 6022719bac90525985f4ebb97324b4c087d47b54384Chris Lattner SF->getName(), Dest); 603cb9048a6e813ca0c89f59375f3aa15ae49e153b4Chris Lattner NewDF->setCallingConv(SF->getCallingConv()); 6042719bac90525985f4ebb97324b4c087d47b54384Chris Lattner 6052719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // If the LLVM runtime renamed the function, but it is an externally 6062719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // visible symbol, DF must be an existing function with internal linkage. 6072719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // Rename it. 608c003628a612d3687fb77088a5894314210a65385Chris Lattner if (NewDF->getName() != SF->getName() && !NewDF->hasInternalLinkage()) 60982b5b219dd3b9035442389ddcd58e6f859aae039Chris Lattner ForceRenaming(NewDF, SF->getName()); 6104ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner 6114ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // ... and remember this mapping... 6122719bac90525985f4ebb97324b4c087d47b54384Chris Lattner ValueMap.insert(std::make_pair(SF, NewDF)); 613c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SF->isExternal()) { 614c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // If SF is external or if both SF & DF are external.. Just link the 615c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // external functions, we aren't adding anything. 616c2b97d43a074445c6856d69538a95de09450c26eChris Lattner ValueMap.insert(std::make_pair(SF, DF)); 617c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (DF->isExternal()) { // If DF is external but SF is not... 618c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // Link the external functions, update linkage qualifiers 619c2b97d43a074445c6856d69538a95de09450c26eChris Lattner ValueMap.insert(std::make_pair(SF, DF)); 620c2b97d43a074445c6856d69538a95de09450c26eChris Lattner DF->setLinkage(SF->getLinkage()); 621c2b97d43a074445c6856d69538a95de09450c26eChris Lattner 62235956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner } else if (SF->hasWeakLinkage() || SF->hasLinkOnceLinkage()) { 62372ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner // At this point we know that DF has LinkOnce, Weak, or External linkage. 62472ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner ValueMap.insert(std::make_pair(SF, DF)); 62572ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner 62635956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner // Linkonce+Weak = Weak 62735956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner if (DF->hasLinkOnceLinkage() && SF->hasWeakLinkage()) 62835956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner DF->setLinkage(SF->getLinkage()); 62935956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner 63035956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner } else if (DF->hasWeakLinkage() || DF->hasLinkOnceLinkage()) { 63172ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner // At this point we know that SF has LinkOnce or External linkage. 63272ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner ValueMap.insert(std::make_pair(SF, DF)); 63372ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner if (!SF->hasLinkOnceLinkage()) // Don't inherit linkonce linkage 63472ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner DF->setLinkage(SF->getLinkage()); 63572ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner 636c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SF->getLinkage() != DF->getLinkage()) { 6370fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner return Error(Err, "Functions named '" + SF->getName() + 6380fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner "' have different linkage specifiers!"); 639c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SF->hasExternalLinkage()) { 640c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // The function is defined in both modules!! 641f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman return Error(Err, "Function '" + 642f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman ToStr(SF->getFunctionType(), Src) + "':\"" + 643c2b97d43a074445c6856d69538a95de09450c26eChris Lattner SF->getName() + "\" - Function is already defined!"); 644c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else { 645c2b97d43a074445c6856d69538a95de09450c26eChris Lattner assert(0 && "Unknown linkage configuration found!"); 6465c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 6475c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 6485c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 6495c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 6505c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 651c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBody - Copy the source function over into the dest function and 652c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// fix up references to values. At this point we know that Dest is an external 653c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function, and that Src is not. 6544bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattnerstatic bool LinkFunctionBody(Function *Dest, Function *Src, 6555c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &GlobalMap, 6565c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 6575c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner assert(Src && Dest && Dest->isExternal() && !Src->isExternal()); 6585c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 6590033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner // Go through and convert function arguments over, remembering the mapping. 660e4d5c441e04bdc00ccf1804744af670655123b07Chris Lattner Function::arg_iterator DI = Dest->arg_begin(); 661e4d5c441e04bdc00ccf1804744af670655123b07Chris Lattner for (Function::arg_iterator I = Src->arg_begin(), E = Src->arg_end(); 66269da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner I != E; ++I, ++DI) { 66369da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner DI->setName(I->getName()); // Copy the name information over... 6645c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 6655c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Add a mapping to our local map 6660033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner GlobalMap.insert(std::make_pair(I, DI)); 6675c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 6685c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 6694bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner // Splice the body of the source function into the dest function. 6704bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner Dest->getBasicBlockList().splice(Dest->end(), Src->getBasicBlockList()); 6715c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 672c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // At this point, all of the instructions and values of the function are now 673c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // copied over. The only problem is that they are still referencing values in 674c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // the Source function as operands. Loop through all of the operands of the 675c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // functions and patch them up to point to the local versions... 6765c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 67718961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Function::iterator BB = Dest->begin(), BE = Dest->end(); BB != BE; ++BB) 67818961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) 67918961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Instruction::op_iterator OI = I->op_begin(), OE = I->op_end(); 680221d688a5ef21a22c2368c9fff0e92d7966c95e5Chris Lattner OI != OE; ++OI) 6814bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner if (!isa<Instruction>(*OI) && !isa<BasicBlock>(*OI)) 6820033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner *OI = RemapOperand(*OI, GlobalMap); 6830033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner 6840033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner // There is no need to map the arguments anymore. 685e4d5c441e04bdc00ccf1804744af670655123b07Chris Lattner for (Function::arg_iterator I = Src->arg_begin(), E = Src->arg_end(); I != E; ++I) 6860033baf94e049e075f3ba4700c109779e2d7c131Chris Lattner GlobalMap.erase(I); 6875c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 6885c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 6895c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 6905c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 6915c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 692c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBodies - Link in the function bodies that are defined in the 693c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// source module into the DestModule. This consists basically of copying the 694c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function over and fixing up references to values. 6954bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattnerstatic bool LinkFunctionBodies(Module *Dest, Module *Src, 6965c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 6975c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 6985c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 699c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Loop over all of the functions in the src module, mapping them over as we 700c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // go 7014bbfbff119acab90fc67cd3d01b156bf88832286Chris Lattner for (Module::iterator SF = Src->begin(), E = Src->end(); SF != E; ++SF) { 70218961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (!SF->isExternal()) { // No body if function is external 70318961504fc2b299578dba817900a0696cf3ccc4dChris Lattner Function *DF = cast<Function>(ValueMap[SF]); // Destination function 704c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner 70518961504fc2b299578dba817900a0696cf3ccc4dChris Lattner // DF not external SF external? 70635956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner if (DF->isExternal()) { 70735956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner // Only provide the function body if there isn't one already. 70835956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner if (LinkFunctionBody(DF, SF, ValueMap, Err)) 70935956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner return true; 710c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner } 711c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner } 7125c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 7135c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 7145c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 7155c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 7168166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// LinkAppendingVars - If there were any appending global variables, link them 7178166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// together now. Return true on error. 7188166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattnerstatic bool LinkAppendingVars(Module *M, 7198166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 7208166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::string *ErrorMsg) { 7218166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (AppendingVars.empty()) return false; // Nothing to do. 722f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 7238166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Loop over the multimap of appending vars, processing any variables with the 7248166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // same name, forming a new appending global variable with both of the 7258166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers merged together, then rewrite references to the old variables 7268166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // and delete them. 7278166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::vector<Constant*> Inits; 7288166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner while (AppendingVars.size() > 1) { 7298166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Get the first two elements in the map... 7308166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, 7318166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable*>::iterator Second = AppendingVars.begin(), First=Second++; 7328166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 7338166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If the first two elements are for different names, there is no pair... 7348166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Otherwise there is a pair, so link them together... 7358166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (First->first == Second->first) { 7368166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *G1 = First->second, *G2 = Second->second; 7378166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T1 = cast<ArrayType>(G1->getType()->getElementType()); 7388166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T2 = cast<ArrayType>(G2->getType()->getElementType()); 739f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 7408166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Check to see that they two arrays agree on type... 7418166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (T1->getElementType() != T2->getElementType()) 7428166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 7438166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables with different element types need to be linked!"); 7448166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (G1->isConstant() != G2->isConstant()) 7458166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 7468166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables linked with different const'ness!"); 7478166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 7488166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner unsigned NewSize = T1->getNumElements() + T2->getNumElements(); 7498166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner ArrayType *NewType = ArrayType::get(T1->getElementType(), NewSize); 7508166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 751ed74a4ef3b813bed0c0f4bb5af42229d50133da2Chris Lattner G1->setName(""); // Clear G1's name in case of a conflict! 752ed74a4ef3b813bed0c0f4bb5af42229d50133da2Chris Lattner 7538166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Create the new global variable... 7548166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NG = 7558166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner new GlobalVariable(NewType, G1->isConstant(), G1->getLinkage(), 7568166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner /*init*/0, First->first, M); 7578166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 7588166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Merge the initializer... 7598166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.reserve(NewSize); 760de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if (ConstantArray *I = dyn_cast<ConstantArray>(G1->getInitializer())) { 761de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i) 762cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos Inits.push_back(I->getOperand(i)); 763de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } else { 764de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner assert(isa<ConstantAggregateZero>(G1->getInitializer())); 765de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Constant *CV = Constant::getNullValue(T1->getElementType()); 766de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i) 767de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(CV); 768de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } 769de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if (ConstantArray *I = dyn_cast<ConstantArray>(G2->getInitializer())) { 770de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i) 771cc7ba49d85b66955516ff0d9574a70e1637dea36Alkis Evlogimenos Inits.push_back(I->getOperand(i)); 772de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } else { 773de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner assert(isa<ConstantAggregateZero>(G2->getInitializer())); 774de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Constant *CV = Constant::getNullValue(T2->getElementType()); 775de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i) 776de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(CV); 777de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } 7788166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner NG->setInitializer(ConstantArray::get(NewType, Inits)); 7798166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.clear(); 7808166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 7818166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Replace any uses of the two global variables with uses of the new 7828166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // global... 7838166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 7848166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // FIXME: This should rewrite simple/straight-forward uses such as 7858166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // getelementptr instructions to not use the Cast! 78600dc4796132933e76fe2b834ca087e42621c175aReid Spencer G1->replaceAllUsesWith(ConstantExpr::getCast(NG, G1->getType())); 78700dc4796132933e76fe2b834ca087e42621c175aReid Spencer G2->replaceAllUsesWith(ConstantExpr::getCast(NG, G2->getType())); 7888166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 7898166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Remove the two globals from the module now... 7908166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G1); 7918166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G2); 7928166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 7938166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Put the new global into the AppendingVars map so that we can handle 7948166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // linking of more than two vars... 7958166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Second->second = NG; 7968166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 7978166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.erase(First); 7988166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 7998166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8008166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return false; 8018166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner} 80252f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 80352f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 80452f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// LinkModules - This function links two modules together, with the resulting 80552f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// left module modified to be the composite of the two input modules. If an 80652f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// error occurs, true is returned and ErrorMsg (if not null) is set to indicate 8075c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// the problem. Upon failure, the Dest module could be in a modified state, and 8085c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// shouldn't be relied on to be consistent. 809f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukmanbool 8100ba9e211bed7813949aaca97e6b15579c8188e05Reid SpencerLinker::LinkModules(Module *Dest, Module *Src, std::string *ErrorMsg) { 81157a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer assert(Dest != 0 && "Invalid Destination module"); 81257a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer assert(Src != 0 && "Invalid Source Module"); 81357a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 814873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner if (Dest->getEndianness() == Module::AnyEndianness) 815873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner Dest->setEndianness(Src->getEndianness()); 816873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner if (Dest->getPointerSize() == Module::AnyPointerSize) 817873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner Dest->setPointerSize(Src->getPointerSize()); 818152f19ac6514ec29e183ddcdf2ea71599638dc4cChris Lattner if (Dest->getTargetTriple().empty()) 819152f19ac6514ec29e183ddcdf2ea71599638dc4cChris Lattner Dest->setTargetTriple(Src->getTargetTriple()); 820873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner 821873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner if (Src->getEndianness() != Module::AnyEndianness && 822873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner Dest->getEndianness() != Src->getEndianness()) 82343a9994c0164848d44527060da72985c75183a48Chris Lattner std::cerr << "WARNING: Linking two modules of different endianness!\n"; 824873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner if (Src->getPointerSize() != Module::AnyPointerSize && 825873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner Dest->getPointerSize() != Src->getPointerSize()) 82643a9994c0164848d44527060da72985c75183a48Chris Lattner std::cerr << "WARNING: Linking two modules of different pointer size!\n"; 827152f19ac6514ec29e183ddcdf2ea71599638dc4cChris Lattner if (!Src->getTargetTriple().empty() && 828152f19ac6514ec29e183ddcdf2ea71599638dc4cChris Lattner Dest->getTargetTriple() != Src->getTargetTriple()) 829152f19ac6514ec29e183ddcdf2ea71599638dc4cChris Lattner std::cerr << "WARNING: Linking two modules of different target triples!\n"; 830f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 831719012d6254ee425464f034250176283fb96793bReid Spencer // Update the destination module's dependent libraries list with the libraries 83257a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // from the source module. There's no opportunity for duplicates here as the 83357a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // Module ensures that duplicate insertions are discarded. 83457a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer Module::lib_iterator SI = Src->lib_begin(); 83557a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer Module::lib_iterator SE = Src->lib_end(); 83657a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer while ( SI != SE ) { 83757a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer Dest->addLibrary(*SI); 83857a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer ++SI; 83957a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer } 84057a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 8412c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // LinkTypes - Go through the symbol table of the Src module and see if any 8422c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // types are named in the src module that are not named in the Dst module. 8432c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Make sure there are no type name conflicts. 8442c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner if (LinkTypes(Dest, Src, ErrorMsg)) return true; 8452c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 8465c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // ValueMap - Mapping of values from what they used to be in Src, to what they 8475c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // are now in Dest. 8485c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> ValueMap; 8495c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 8508166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars - Keep track of global variables in the destination module 8518166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // with appending linkage. After the module is linked together, they are 8528166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // appended and the module is rewritten. 8538166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> AppendingVars; 8548166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8555a837defff581accc09048bea1cd839009e374a7Chris Lattner // GlobalsByName - The LLVM SymbolTable class fights our best efforts at 8565a837defff581accc09048bea1cd839009e374a7Chris Lattner // linking by separating globals by type. Until PR411 is fixed, we replicate 8575a837defff581accc09048bea1cd839009e374a7Chris Lattner // it's functionality here. 8585a837defff581accc09048bea1cd839009e374a7Chris Lattner std::map<std::string, GlobalValue*> GlobalsByName; 8595a837defff581accc09048bea1cd839009e374a7Chris Lattner 860e4d5c441e04bdc00ccf1804744af670655123b07Chris Lattner for (Module::global_iterator I = Dest->global_begin(), E = Dest->global_end(); I != E; ++I) { 8615a837defff581accc09048bea1cd839009e374a7Chris Lattner // Add all of the appending globals already in the Dest module to 8625a837defff581accc09048bea1cd839009e374a7Chris Lattner // AppendingVars. 863f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner if (I->hasAppendingLinkage()) 864f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner AppendingVars.insert(std::make_pair(I->getName(), I)); 8658166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8665a837defff581accc09048bea1cd839009e374a7Chris Lattner // Keep track of all globals by name. 8675a837defff581accc09048bea1cd839009e374a7Chris Lattner if (!I->hasInternalLinkage() && I->hasName()) 8685a837defff581accc09048bea1cd839009e374a7Chris Lattner GlobalsByName[I->getName()] = I; 8695a837defff581accc09048bea1cd839009e374a7Chris Lattner } 8705a837defff581accc09048bea1cd839009e374a7Chris Lattner 8715a837defff581accc09048bea1cd839009e374a7Chris Lattner // Keep track of all globals by name. 8725a837defff581accc09048bea1cd839009e374a7Chris Lattner for (Module::iterator I = Dest->begin(), E = Dest->end(); I != E; ++I) 8735a837defff581accc09048bea1cd839009e374a7Chris Lattner if (!I->hasInternalLinkage() && I->hasName()) 8745a837defff581accc09048bea1cd839009e374a7Chris Lattner GlobalsByName[I->getName()] = I; 8755a837defff581accc09048bea1cd839009e374a7Chris Lattner 8768166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Insert all of the globals in src into the Dest module... without linking 8778166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers (which could refer to functions not yet mapped over). 8785a837defff581accc09048bea1cd839009e374a7Chris Lattner if (LinkGlobals(Dest, Src, ValueMap, AppendingVars, GlobalsByName, ErrorMsg)) 8795a837defff581accc09048bea1cd839009e374a7Chris Lattner return true; 8805c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 881c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link the functions together between the two modules, without doing function 882c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // bodies... this just adds external function prototypes to the Dest 883c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // function... We do this so that when we begin processing function bodies, 884c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // all of the global values that may be referenced are available in our 885c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // ValueMap. 8865a837defff581accc09048bea1cd839009e374a7Chris Lattner if (LinkFunctionProtos(Dest, Src, ValueMap, GlobalsByName, ErrorMsg)) 8875a837defff581accc09048bea1cd839009e374a7Chris Lattner return true; 8885c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 8896cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // Update the initializers in the Dest module now that all globals that may 8906cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // be referenced are in Dest. 8916cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner if (LinkGlobalInits(Dest, Src, ValueMap, ErrorMsg)) return true; 8926cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner 893c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link in the function bodies that are defined in the source module into the 894c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // DestModule. This consists basically of copying the function over and 895c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // fixing up references to values. 89679df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner if (LinkFunctionBodies(Dest, Src, ValueMap, ErrorMsg)) return true; 89752f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 8988166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If there were any appending global variables, link them together now. 8998166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (LinkAppendingVars(Dest, AppendingVars, ErrorMsg)) return true; 9008166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 90157a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // If the source library's module id is in the dependent library list of the 90257a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer // destination library, remove it since that module is now linked in. 90357a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer sys::Path modId; 904dd04df0ec33a903ee7fc747701bafde622f77d8bReid Spencer modId.set(Src->getModuleIdentifier()); 90507adb2836b8aa7a3872e33c285958f5937662b50Reid Spencer if (!modId.isEmpty()) 90607adb2836b8aa7a3872e33c285958f5937662b50Reid Spencer Dest->removeLibrary(modId.getBasename()); 90757a0efa32240ef03ea318f9ba7680fd2b8609c6eReid Spencer 90852f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner return false; 90952f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner} 9109466f5113ba859677a28887c3c7143065e702019Vikram S. Adve 911567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer// vim: sw=2 912