LinkModules.cpp revision 1438102576b94d6dac9bb18e8df291c4d632572d
152f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner//===- Linker.cpp - Module Linker Implementation --------------------------===// 2b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// 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. 7b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// 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 19c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner#include "llvm/Transforms/Utils/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" 245c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner#include "llvm/iOther.h" 25adbc0b5287bf36893cdcae2440d48b3cb3489e38Chris Lattner#include "llvm/Assembly/Writer.h" 26f7703df4968084c18c248c1feea9961c19a32e6aChris Lattnerusing namespace llvm; 27d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke 285c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// Error - Simple wrapper function to conditionally assign to E and return true. 295c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// This just makes error return conditions a little bit simpler... 305c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 318166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattnerstatic inline bool Error(std::string *E, const std::string &Message) { 325c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner if (E) *E = Message; 335c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return true; 345c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 355c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 36700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 37700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Function: ResolveTypes() 38700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 39700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Description: 40700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Attempt to link the two specified types together. 41700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 42700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Inputs: 43700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// DestTy - The type to which we wish to resolve. 44700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// SrcTy - The original type which we want to resolve. 45700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Name - The name of the type. 46700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 47700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Outputs: 48700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// DestST - The symbol table in which the new type should be placed. 49700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 50700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Return value: 51700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// true - There is an error and the types cannot yet be linked. 52700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// false - No errors. 534c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner// 54e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattnerstatic bool ResolveTypes(const Type *DestTy, const Type *SrcTy, 55e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner SymbolTable *DestST, const std::string &Name) { 56e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DestTy == SrcTy) return false; // If already equal, noop 57e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 584c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Does the type already exist in the module? 594c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (DestTy && !isa<OpaqueType>(DestTy)) { // Yup, the type already exists... 60e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (const OpaqueType *OT = dyn_cast<OpaqueType>(SrcTy)) { 61e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner const_cast<OpaqueType*>(OT)->refineAbstractTypeTo(DestTy); 624c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } else { 634c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner return true; // Cannot link types... neither is opaque and not-equal 644c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 654c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } else { // Type not in dest module. Add it now. 664c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (DestTy) // Type _is_ in module, just opaque... 67e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner const_cast<OpaqueType*>(cast<OpaqueType>(DestTy)) 68e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner ->refineAbstractTypeTo(SrcTy); 69fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner else if (!Name.empty()) 70e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner DestST->insert(Name, const_cast<Type*>(SrcTy)); 714c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 724c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner return false; 734c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner} 744c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 7543f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattnerstatic const FunctionType *getFT(const PATypeHolder &TH) { 7643f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return cast<FunctionType>(TH.get()); 7743f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner} 789732be769e57f1dec03f046ab957053048f60e40Chris Lattnerstatic const StructType *getST(const PATypeHolder &TH) { 7943f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return cast<StructType>(TH.get()); 8043f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner} 81e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 82e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// RecursiveResolveTypes - This is just like ResolveTypes, except that it 83e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// recurses down into derived types, merging the used types if the parent types 84e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// are compatible. 85e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// 86e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattnerstatic bool RecursiveResolveTypesI(const PATypeHolder &DestTy, 87e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner const PATypeHolder &SrcTy, 88e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner SymbolTable *DestST, const std::string &Name, 89e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner std::vector<std::pair<PATypeHolder, PATypeHolder> > &Pointers) { 9043f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner const Type *SrcTyT = SrcTy.get(); 9143f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner const Type *DestTyT = DestTy.get(); 9243f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner if (DestTyT == SrcTyT) return false; // If already equal, noop 93e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 94e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // If we found our opaque type, resolve it now! 9543f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner if (isa<OpaqueType>(DestTyT) || isa<OpaqueType>(SrcTyT)) 9643f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return ResolveTypes(DestTyT, SrcTyT, DestST, Name); 97e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 98e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Two types cannot be resolved together if they are of different primitive 99e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // type. For example, we cannot resolve an int to a float. 10043f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner if (DestTyT->getPrimitiveID() != SrcTyT->getPrimitiveID()) return true; 101e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 102e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Otherwise, resolve the used type used by this derived type... 10343f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner switch (DestTyT->getPrimitiveID()) { 104e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::FunctionTyID: { 10543f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner if (cast<FunctionType>(DestTyT)->isVarArg() != 106841e00b96295a2b66cb7573e961656d28a6cb12bChris Lattner cast<FunctionType>(SrcTyT)->isVarArg() || 107841e00b96295a2b66cb7573e961656d28a6cb12bChris Lattner cast<FunctionType>(DestTyT)->getNumContainedTypes() != 108841e00b96295a2b66cb7573e961656d28a6cb12bChris Lattner cast<FunctionType>(SrcTyT)->getNumContainedTypes()) 10943f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return true; 11043f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner for (unsigned i = 0, e = getFT(DestTy)->getNumContainedTypes(); i != e; ++i) 111e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner if (RecursiveResolveTypesI(getFT(DestTy)->getContainedType(i), 112e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner getFT(SrcTy)->getContainedType(i), DestST, "", 113e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner Pointers)) 114e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return true; 115e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return false; 116e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 117e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::StructTyID: { 11843f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner if (getST(DestTy)->getNumContainedTypes() != 11943f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner getST(SrcTy)->getNumContainedTypes()) return 1; 12043f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner for (unsigned i = 0, e = getST(DestTy)->getNumContainedTypes(); i != e; ++i) 121e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner if (RecursiveResolveTypesI(getST(DestTy)->getContainedType(i), 122e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner getST(SrcTy)->getContainedType(i), DestST, "", 123e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner Pointers)) 124e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return true; 125e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return false; 126e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 127e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::ArrayTyID: { 12843f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner const ArrayType *DAT = cast<ArrayType>(DestTy.get()); 12943f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner const ArrayType *SAT = cast<ArrayType>(SrcTy.get()); 130e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DAT->getNumElements() != SAT->getNumElements()) return true; 131e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner return RecursiveResolveTypesI(DAT->getElementType(), SAT->getElementType(), 132e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner DestST, "", Pointers); 133e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner } 134e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner case Type::PointerTyID: { 135e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // If this is a pointer type, check to see if we have already seen it. If 136e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // so, we are in a recursive branch. Cut off the search now. We cannot use 137e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // an associative container for this search, because the type pointers (keys 138e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // in the container) change whenever types get resolved... 139e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // 140e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner for (unsigned i = 0, e = Pointers.size(); i != e; ++i) 141e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner if (Pointers[i].first == DestTy) 142e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner return Pointers[i].second != SrcTy; 143e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner 144e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // Otherwise, add the current pointers to the vector to stop recursion on 145e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // this pair. 146e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner Pointers.push_back(std::make_pair(DestTyT, SrcTyT)); 147e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner bool Result = 148e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner RecursiveResolveTypesI(cast<PointerType>(DestTy.get())->getElementType(), 149e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner cast<PointerType>(SrcTy.get())->getElementType(), 150e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner DestST, "", Pointers); 151e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner Pointers.pop_back(); 152e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner return Result; 153e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 154e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner default: assert(0 && "Unexpected type!"); return true; 155e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 156e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner} 157e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 158e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattnerstatic bool RecursiveResolveTypes(const PATypeHolder &DestTy, 159e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner const PATypeHolder &SrcTy, 160e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner SymbolTable *DestST, const std::string &Name){ 161e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner std::vector<std::pair<PATypeHolder, PATypeHolder> > PointerTypes; 162e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner return RecursiveResolveTypesI(DestTy, SrcTy, DestST, Name, PointerTypes); 163e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner} 164e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner 165e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 1662c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// LinkTypes - Go through the symbol table of the Src module and see if any 1672c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// types are named in the src module that are not named in the Dst module. 1682c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// Make sure there are no type name conflicts. 1692c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// 1705c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic bool LinkTypes(Module *Dest, const Module *Src, std::string *Err) { 1716e6026b46569b01f8f6d4dcdb6c899c3a9c76b3eChris Lattner SymbolTable *DestST = &Dest->getSymbolTable(); 1726e6026b46569b01f8f6d4dcdb6c899c3a9c76b3eChris Lattner const SymbolTable *SrcST = &Src->getSymbolTable(); 1732c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 1742c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Look for a type plane for Type's... 1752c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner SymbolTable::const_iterator PI = SrcST->find(Type::TypeTy); 1762c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner if (PI == SrcST->end()) return false; // No named types, do nothing. 1772c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 178cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // Some types cannot be resolved immediately because they depend on other 179cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // types being resolved to each other first. This contains a list of types we 180cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // are waiting to recheck. 1814c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner std::vector<std::string> DelayedTypesToResolve; 1824c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 1832c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner const SymbolTable::VarMap &VM = PI->second; 1842c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner for (SymbolTable::type_const_iterator I = VM.begin(), E = VM.end(); 1852c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner I != E; ++I) { 1865c2d335d86579941b71816196a95a64b277e8963Chris Lattner const std::string &Name = I->first; 1874c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner Type *RHS = cast<Type>(I->second); 1882c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 1892c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Check to see if this type name is already in the dest module... 1904c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner Type *Entry = cast_or_null<Type>(DestST->lookup(Type::TypeTy, Name)); 1914c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 1924c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (ResolveTypes(Entry, RHS, DestST, Name)) { 1934c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // They look different, save the types 'till later to resolve. 1944c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner DelayedTypesToResolve.push_back(Name); 1954c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 1964c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 1974c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 1984c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Iteratively resolve types while we can... 1994c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner while (!DelayedTypesToResolve.empty()) { 2004c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Loop over all of the types, attempting to resolve them if possible... 2014c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner unsigned OldSize = DelayedTypesToResolve.size(); 2024c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 203e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Try direct resolution by name... 2044c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner for (unsigned i = 0; i != DelayedTypesToResolve.size(); ++i) { 2054c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner const std::string &Name = DelayedTypesToResolve[i]; 2064c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner Type *T1 = cast<Type>(VM.find(Name)->second); 2074c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner Type *T2 = cast<Type>(DestST->lookup(Type::TypeTy, Name)); 2084c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (!ResolveTypes(T2, T1, DestST, Name)) { 2094c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // We are making progress! 2104c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i); 2114c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner --i; 2122f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner } 2134c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 2142f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner 2154c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Did we not eliminate any types? 2164c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (DelayedTypesToResolve.size() == OldSize) { 217e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Attempt to resolve subelements of types. This allows us to merge these 218e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // two types: { int* } and { opaque* } 2194c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner for (unsigned i = 0, e = DelayedTypesToResolve.size(); i != e; ++i) { 2204c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner const std::string &Name = DelayedTypesToResolve[i]; 22143f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner PATypeHolder T1(cast<Type>(VM.find(Name)->second)); 22243f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner PATypeHolder T2(cast<Type>(DestST->lookup(Type::TypeTy, Name))); 223e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 224e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (!RecursiveResolveTypes(T2, T1, DestST, Name)) { 225e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // We are making progress! 226e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i); 227e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 228e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Go back to the main loop, perhaps we can resolve directly by name 229e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // now... 230e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner break; 231e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 232e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 233e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 234e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // If we STILL cannot resolve the types, then there is something wrong. 235aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner // Report the warning and delete one of the names. 236e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DelayedTypesToResolve.size() == OldSize) { 237aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner const std::string &Name = DelayedTypesToResolve.back(); 238aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner 239aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner const Type *T1 = cast<Type>(VM.find(Name)->second); 240aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner const Type *T2 = cast<Type>(DestST->lookup(Type::TypeTy, Name)); 241aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner std::cerr << "WARNING: Type conflict between types named '" << Name 242adbc0b5287bf36893cdcae2440d48b3cb3489e38Chris Lattner << "'.\n Src='"; 243adbc0b5287bf36893cdcae2440d48b3cb3489e38Chris Lattner WriteTypeSymbolic(std::cerr, T1, Src); 244adbc0b5287bf36893cdcae2440d48b3cb3489e38Chris Lattner std::cerr << "'.\n Dest='"; 245adbc0b5287bf36893cdcae2440d48b3cb3489e38Chris Lattner WriteTypeSymbolic(std::cerr, T2, Dest); 246adbc0b5287bf36893cdcae2440d48b3cb3489e38Chris Lattner std::cerr << "'\n"; 247aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner 248aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner // Remove the symbol name from the destination. 249aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner DelayedTypesToResolve.pop_back(); 2504c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 2512c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner } 2522c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner } 2534c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 2544c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 2552c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner return false; 2562c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner} 2572c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 2585c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic void PrintMap(const std::map<const Value*, Value*> &M) { 2595c2d335d86579941b71816196a95a64b277e8963Chris Lattner for (std::map<const Value*, Value*>::const_iterator I = M.begin(), E =M.end(); 2602d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner I != E; ++I) { 2615c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << " Fr: " << (void*)I->first << " "; 26287182ae6baf28ca6da6ee4bc00cf1857f293acfeChris Lattner I->first->dump(); 2635c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << " To: " << (void*)I->second << " "; 26487182ae6baf28ca6da6ee4bc00cf1857f293acfeChris Lattner I->second->dump(); 2655c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << "\n"; 2662d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner } 2672d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner} 2682d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 2692d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 2705c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// RemapOperand - Use LocalMap and GlobalMap to convert references from one 2715c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// module to another. This is somewhat sophisticated in that it can 2725c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// automatically handle constant references correctly as well... 2735c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 2745c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic Value *RemapOperand(const Value *In, 2755c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &LocalMap, 2765c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> *GlobalMap) { 2775c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*,Value*>::const_iterator I = LocalMap.find(In); 2785c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner if (I != LocalMap.end()) return I->second; 2795c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 2805c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner if (GlobalMap) { 2815c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner I = GlobalMap->find(In); 2825c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner if (I != GlobalMap->end()) return I->second; 2835c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 2845c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 2858d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Check to see if it's a constant that we are interesting in transforming... 28618961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (const Constant *CPV = dyn_cast<Constant>(In)) { 287de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if ((!isa<DerivedType>(CPV->getType()) && !isa<ConstantExpr>(CPV)) || 288de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner isa<ConstantAggregateZero>(CPV)) 28918961504fc2b299578dba817900a0696cf3ccc4dChris Lattner return const_cast<Constant*>(CPV); // Simple constants stay identical... 2908d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 291e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Constant *Result = 0; 2928d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 29318961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (const ConstantArray *CPA = dyn_cast<ConstantArray>(CPV)) { 294697954c15da58bd8b186dbafdedd8b06db770201Chris Lattner const std::vector<Use> &Ops = CPA->getValues(); 295697954c15da58bd8b186dbafdedd8b06db770201Chris Lattner std::vector<Constant*> Operands(Ops.size()); 296e306d94782b1c608857738279852dcc050c66004Chris Lattner for (unsigned i = 0, e = Ops.size(); i != e; ++i) 2978d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner Operands[i] = 298e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner cast<Constant>(RemapOperand(Ops[i], LocalMap, GlobalMap)); 299e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Result = ConstantArray::get(cast<ArrayType>(CPA->getType()), Operands); 30018961504fc2b299578dba817900a0696cf3ccc4dChris Lattner } else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(CPV)) { 301697954c15da58bd8b186dbafdedd8b06db770201Chris Lattner const std::vector<Use> &Ops = CPS->getValues(); 302697954c15da58bd8b186dbafdedd8b06db770201Chris Lattner std::vector<Constant*> Operands(Ops.size()); 3038d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner for (unsigned i = 0; i < Ops.size(); ++i) 3048d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner Operands[i] = 305e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner cast<Constant>(RemapOperand(Ops[i], LocalMap, GlobalMap)); 306e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Result = ConstantStruct::get(cast<StructType>(CPS->getType()), Operands); 307e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner } else if (isa<ConstantPointerNull>(CPV)) { 30818961504fc2b299578dba817900a0696cf3ccc4dChris Lattner Result = const_cast<Constant*>(CPV); 30918961504fc2b299578dba817900a0696cf3ccc4dChris Lattner } else if (const ConstantPointerRef *CPR = 31018961504fc2b299578dba817900a0696cf3ccc4dChris Lattner dyn_cast<ConstantPointerRef>(CPV)) { 3118d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner Value *V = RemapOperand(CPR->getValue(), LocalMap, GlobalMap); 312e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Result = ConstantPointerRef::get(cast<GlobalValue>(V)); 3136cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) { 314b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner if (CE->getOpcode() == Instruction::GetElementPtr) { 315b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner Value *Ptr = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap); 316b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner std::vector<Constant*> Indices; 317b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner Indices.reserve(CE->getNumOperands()-1); 318b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i) 319b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner Indices.push_back(cast<Constant>(RemapOperand(CE->getOperand(i), 320b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner LocalMap, GlobalMap))); 321b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner 322b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner Result = ConstantExpr::getGetElementPtr(cast<Constant>(Ptr), Indices); 323b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner } else if (CE->getNumOperands() == 1) { 324ad333484ea5ae976b83e35ccd3f6cfa6e71290e2Chris Lattner // Cast instruction 325ad333484ea5ae976b83e35ccd3f6cfa6e71290e2Chris Lattner assert(CE->getOpcode() == Instruction::Cast); 3266cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner Value *V = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap); 327ad333484ea5ae976b83e35ccd3f6cfa6e71290e2Chris Lattner Result = ConstantExpr::getCast(cast<Constant>(V), CE->getType()); 3281438102576b94d6dac9bb18e8df291c4d632572dChris Lattner } else if (CE->getNumOperands() == 3) { 3291438102576b94d6dac9bb18e8df291c4d632572dChris Lattner // Select instruction 3301438102576b94d6dac9bb18e8df291c4d632572dChris Lattner assert(CE->getOpcode() == Instruction::Select); 3311438102576b94d6dac9bb18e8df291c4d632572dChris Lattner Value *V1 = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap); 3321438102576b94d6dac9bb18e8df291c4d632572dChris Lattner Value *V2 = RemapOperand(CE->getOperand(1), LocalMap, GlobalMap); 3331438102576b94d6dac9bb18e8df291c4d632572dChris Lattner Value *V3 = RemapOperand(CE->getOperand(2), LocalMap, GlobalMap); 3341438102576b94d6dac9bb18e8df291c4d632572dChris Lattner Result = ConstantExpr::getSelect(cast<Constant>(V1), cast<Constant>(V2), 3351438102576b94d6dac9bb18e8df291c4d632572dChris Lattner cast<Constant>(V3)); 3366cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } else if (CE->getNumOperands() == 2) { 3376cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // Binary operator... 3386cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner Value *V1 = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap); 3396cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner Value *V2 = RemapOperand(CE->getOperand(1), LocalMap, GlobalMap); 3406cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner 3416cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner Result = ConstantExpr::get(CE->getOpcode(), cast<Constant>(V1), 342d981f8af79be9ea647d593531091740a3a27a85fChris Lattner cast<Constant>(V2)); 3436cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } else { 344b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner assert(0 && "Unknown constant expr type!"); 3456cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } 3466cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner 3478d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } else { 3488d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner assert(0 && "Unknown type of derived type constant value!"); 3498d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 3508d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 3518d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Cache the mapping in our local map structure... 352d149c053cdbb406b7b5dff24127b4c509420893eChris Lattner if (GlobalMap) 353d149c053cdbb406b7b5dff24127b4c509420893eChris Lattner GlobalMap->insert(std::make_pair(In, Result)); 354d149c053cdbb406b7b5dff24127b4c509420893eChris Lattner else 355d149c053cdbb406b7b5dff24127b4c509420893eChris Lattner LocalMap.insert(std::make_pair(In, Result)); 3568d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return Result; 3578d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 3582d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 3595c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << "XXX LocalMap: \n"; 3602d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner PrintMap(LocalMap); 3612d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 3622d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner if (GlobalMap) { 3635c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << "XXX GlobalMap: \n"; 3642d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner PrintMap(*GlobalMap); 3652d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner } 3662d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 3675c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << "Couldn't remap value: " << (void*)In << " " << *In << "\n"; 3688d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner assert(0 && "Couldn't remap value!"); 3698d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return 0; 3705c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 3715c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 372fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner/// FindGlobalNamed - Look in the specified symbol table for a global with the 373fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner/// specified name and type. If an exactly matching global does not exist, see 374fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner/// if there is a global which is "type compatible" with the specified 375fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner/// name/type. This allows us to resolve things like '%x = global int*' with 376fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner/// '%x = global opaque*'. 377fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner/// 378fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattnerstatic GlobalValue *FindGlobalNamed(const std::string &Name, const Type *Ty, 379fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner SymbolTable *ST) { 380fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner // See if an exact match exists in the symbol table... 381fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner if (Value *V = ST->lookup(Ty, Name)) return cast<GlobalValue>(V); 382fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner 383fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner // It doesn't exist exactly, scan through all of the type planes in the symbol 384fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner // table, checking each of them for a type-compatible version. 385fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner // 386f44c6051e02ddb207d5928b4ef3cde956d2b5025Chris Lattner for (SymbolTable::iterator I = ST->begin(), E = ST->end(); I != E; ++I) 38777c5f733ac51c122ee3f75b8cc247b923d472909Chris Lattner if (I->first != Type::TypeTy) { 388f44c6051e02ddb207d5928b4ef3cde956d2b5025Chris Lattner SymbolTable::VarMap &VM = I->second; 389700867bb69ae1469f2b20005a79fd133e83fd552John Criswell 390f44c6051e02ddb207d5928b4ef3cde956d2b5025Chris Lattner // Does this type plane contain an entry with the specified name? 391f44c6051e02ddb207d5928b4ef3cde956d2b5025Chris Lattner SymbolTable::type_iterator TI = VM.find(Name); 392f44c6051e02ddb207d5928b4ef3cde956d2b5025Chris Lattner if (TI != VM.end()) { 393700867bb69ae1469f2b20005a79fd133e83fd552John Criswell // 394700867bb69ae1469f2b20005a79fd133e83fd552John Criswell // Ensure that this type if placed correctly into the symbol table. 395700867bb69ae1469f2b20005a79fd133e83fd552John Criswell // 396700867bb69ae1469f2b20005a79fd133e83fd552John Criswell assert(TI->second->getType() == I->first && "Type conflict!"); 397700867bb69ae1469f2b20005a79fd133e83fd552John Criswell 398700867bb69ae1469f2b20005a79fd133e83fd552John Criswell // 399700867bb69ae1469f2b20005a79fd133e83fd552John Criswell // Save a reference to the new type. Resolving the type can modify the 400700867bb69ae1469f2b20005a79fd133e83fd552John Criswell // symbol table, invalidating the TI variable. 401700867bb69ae1469f2b20005a79fd133e83fd552John Criswell // 402700867bb69ae1469f2b20005a79fd133e83fd552John Criswell Value *ValPtr = TI->second; 403700867bb69ae1469f2b20005a79fd133e83fd552John Criswell 404700867bb69ae1469f2b20005a79fd133e83fd552John Criswell // 405f44c6051e02ddb207d5928b4ef3cde956d2b5025Chris Lattner // Determine whether we can fold the two types together, resolving them. 406f44c6051e02ddb207d5928b4ef3cde956d2b5025Chris Lattner // If so, we can use this value. 407700867bb69ae1469f2b20005a79fd133e83fd552John Criswell // 408f44c6051e02ddb207d5928b4ef3cde956d2b5025Chris Lattner if (!RecursiveResolveTypes(Ty, I->first, ST, "")) 409700867bb69ae1469f2b20005a79fd133e83fd552John Criswell return cast<GlobalValue>(ValPtr); 410f44c6051e02ddb207d5928b4ef3cde956d2b5025Chris Lattner } 411fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner } 412fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner return 0; // Otherwise, nothing could be found. 413fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner} 414fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner 4155c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4165c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// LinkGlobals - Loop through the global variables in the src module and merge 4178166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// them into the dest module. 4185c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 4195c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattnerstatic bool LinkGlobals(Module *Dest, const Module *Src, 4205c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 4218166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 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(); 4265c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4275c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 4285c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 4295c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner for (Module::const_giterator I = Src->gbegin(), E = Src->gend(); I != E; ++I){ 43018961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const GlobalVariable *SGV = I; 4314ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner GlobalVariable *DGV = 0; 4324ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (SGV->hasName()) { 4334ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // A same named thing is a global variable, because the only two things 43479df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner // that may be in a module level symbol table are Global Vars and 43579df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner // Functions, and they both have distinct, nonoverlapping, possible types. 4365c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 437fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner DGV = cast_or_null<GlobalVariable>(FindGlobalNamed(SGV->getName(), 438fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner SGV->getType(), ST)); 4394ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } 4405c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4414ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(SGV->hasInitializer() || SGV->hasExternalLinkage() && 4424ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner "Global must either be external or have an initializer!"); 4435c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4440fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner bool SGExtern = SGV->isExternal(); 4450fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner bool DGExtern = DGV ? DGV->isExternal() : false; 4460fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner 4474ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (!DGV || DGV->hasInternalLinkage() || SGV->hasInternalLinkage()) { 4485c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // No linking to be performed, simply create an identical version of the 4498d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // symbol over in the dest module... the initializer will be filled in 4508d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // later by LinkGlobalInits... 4518d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // 4522719bac90525985f4ebb97324b4c087d47b54384Chris Lattner GlobalVariable *NewDGV = 4532719bac90525985f4ebb97324b4c087d47b54384Chris Lattner new GlobalVariable(SGV->getType()->getElementType(), 4542719bac90525985f4ebb97324b4c087d47b54384Chris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 4552719bac90525985f4ebb97324b4c087d47b54384Chris Lattner SGV->getName(), Dest); 4562719bac90525985f4ebb97324b4c087d47b54384Chris Lattner 4572719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // If the LLVM runtime renamed the global, but it is an externally visible 4582719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // symbol, DGV must be an existing global with internal linkage. Rename 4592719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // it. 4602719bac90525985f4ebb97324b4c087d47b54384Chris Lattner if (NewDGV->getName() != SGV->getName() && !NewDGV->hasInternalLinkage()){ 4612719bac90525985f4ebb97324b4c087d47b54384Chris Lattner assert(DGV && DGV->getName() == SGV->getName() && 4622719bac90525985f4ebb97324b4c087d47b54384Chris Lattner DGV->hasInternalLinkage()); 4632719bac90525985f4ebb97324b4c087d47b54384Chris Lattner DGV->setName(""); 4642719bac90525985f4ebb97324b4c087d47b54384Chris Lattner NewDGV->setName(SGV->getName()); // Force the name back 4652719bac90525985f4ebb97324b4c087d47b54384Chris Lattner DGV->setName(SGV->getName()); // This will cause a renaming 4662719bac90525985f4ebb97324b4c087d47b54384Chris Lattner assert(NewDGV->getName() == SGV->getName() && 4672719bac90525985f4ebb97324b4c087d47b54384Chris Lattner DGV->getName() != SGV->getName()); 4682719bac90525985f4ebb97324b4c087d47b54384Chris Lattner } 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)); 4758166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 476c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SGV->isExternal()) { 477c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // If SGV is external or if both SGV & DGV are external.. Just link the 478c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // external globals, we aren't adding anything. 479c2b97d43a074445c6856d69538a95de09450c26eChris Lattner ValueMap.insert(std::make_pair(SGV, DGV)); 480c2b97d43a074445c6856d69538a95de09450c26eChris Lattner 481c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (DGV->isExternal()) { // If DGV is external but SGV is not... 482c2b97d43a074445c6856d69538a95de09450c26eChris Lattner ValueMap.insert(std::make_pair(SGV, DGV)); 483c2b97d43a074445c6856d69538a95de09450c26eChris Lattner DGV->setLinkage(SGV->getLinkage()); // Inherit linkage! 48435956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner } else if (SGV->hasWeakLinkage() || SGV->hasLinkOnceLinkage()) { 48572ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner // At this point we know that DGV has LinkOnce, Appending, Weak, or 48672ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner // External linkage. If DGV is Appending, this is an error. 48772ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner if (DGV->hasAppendingLinkage()) 48872ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner return Error(Err, "Linking globals named '" + SGV->getName() + 48972ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner " ' with 'weak' and 'appending' linkage is not allowed!"); 49035956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner 49135956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner if (SGV->isConstant() != DGV->isConstant()) 49235956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner return Error(Err, "Global Variable Collision on '" + 49335956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner SGV->getType()->getDescription() + " %" + SGV->getName() + 49435956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner "' - Global variables differ in const'ness"); 49535956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner 49672ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner // Otherwise, just perform the link. 49772ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner ValueMap.insert(std::make_pair(SGV, DGV)); 49835956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner 49935956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner // Linkonce+Weak = Weak 50035956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner if (DGV->hasLinkOnceLinkage() && SGV->hasWeakLinkage()) 50135956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner DGV->setLinkage(SGV->getLinkage()); 50235956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner 50335956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner } else if (DGV->hasWeakLinkage() || DGV->hasLinkOnceLinkage()) { 50472ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner // At this point we know that SGV has LinkOnce, Appending, or External 50572ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner // linkage. If SGV is Appending, this is an error. 50672ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner if (SGV->hasAppendingLinkage()) 50772ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner return Error(Err, "Linking globals named '" + SGV->getName() + 50872ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner " ' with 'weak' and 'appending' linkage is not allowed!"); 50935956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner 51035956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner if (SGV->isConstant() != DGV->isConstant()) 51135956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner return Error(Err, "Global Variable Collision on '" + 51235956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner SGV->getType()->getDescription() + " %" + SGV->getName() + 51335956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner "' - Global variables differ in const'ness"); 51435956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner 51572ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner if (!SGV->hasLinkOnceLinkage()) 51672ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner DGV->setLinkage(SGV->getLinkage()); // Inherit linkage! 51772ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner ValueMap.insert(std::make_pair(SGV, DGV)); 51872ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner 519c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SGV->getLinkage() != DGV->getLinkage()) { 5204ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner return Error(Err, "Global variables named '" + SGV->getName() + 5214ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner "' have different linkage specifiers!"); 522c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SGV->hasExternalLinkage()) { 523c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // Allow linking two exactly identical external global variables... 524f85770c9a670dc5c360015125389c389ae9592c7Chris Lattner if (SGV->isConstant() != DGV->isConstant()) 525c2b97d43a074445c6856d69538a95de09450c26eChris Lattner return Error(Err, "Global Variable Collision on '" + 526c2b97d43a074445c6856d69538a95de09450c26eChris Lattner SGV->getType()->getDescription() + " %" + SGV->getName() + 527c2b97d43a074445c6856d69538a95de09450c26eChris Lattner "' - Global variables differ in const'ness"); 528f85770c9a670dc5c360015125389c389ae9592c7Chris Lattner 529f85770c9a670dc5c360015125389c389ae9592c7Chris Lattner if (SGV->getInitializer() != DGV->getInitializer()) 530f85770c9a670dc5c360015125389c389ae9592c7Chris Lattner return Error(Err, "Global Variable Collision on '" + 531f85770c9a670dc5c360015125389c389ae9592c7Chris Lattner SGV->getType()->getDescription() + " %" + SGV->getName() + 532f85770c9a670dc5c360015125389c389ae9592c7Chris Lattner "' - External linkage globals have different initializers"); 533f85770c9a670dc5c360015125389c389ae9592c7Chris Lattner 534c2b97d43a074445c6856d69538a95de09450c26eChris Lattner ValueMap.insert(std::make_pair(SGV, DGV)); 535c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SGV->hasAppendingLinkage()) { 5368166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // No linking is performed yet. Just insert a new copy of the global, and 5378166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // keep track of the fact that it is an appending variable in the 5388166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars map. The name is cleared out so that no linkage is 5398166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // performed. 5408166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NewDGV = 5418166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner new GlobalVariable(SGV->getType()->getElementType(), 5428166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 5438166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "", Dest); 5448166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 5458166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Make sure to remember this mapping... 5468166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner ValueMap.insert(std::make_pair(SGV, NewDGV)); 5478166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 5488166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Keep track that this is an appending variable... 5498166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV)); 5504ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else { 5514ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(0 && "Unknown linkage!"); 5525c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 5535c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 5545c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 5555c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 5565c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 5575c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 5588d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// LinkGlobalInits - Update the initializers in the Dest module now that all 5598d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// globals that may be referenced are in Dest. 5608d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// 5618d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattnerstatic bool LinkGlobalInits(Module *Dest, const Module *Src, 5625c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 5635c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 5648d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 5658d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 5668d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // 5678d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner for (Module::const_giterator I = Src->gbegin(), E = Src->gend(); I != E; ++I){ 56818961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const GlobalVariable *SGV = I; 5698d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 5708d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner if (SGV->hasInitializer()) { // Only process initialized GV's 5718d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Figure out what the initializer looks like in the dest module... 5724ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner Constant *SInit = 5732f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner cast<Constant>(RemapOperand(SGV->getInitializer(), ValueMap, 0)); 5748d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 5758d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner GlobalVariable *DGV = cast<GlobalVariable>(ValueMap[SGV]); 5764ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (DGV->hasInitializer()) { 5774ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (SGV->hasExternalLinkage()) { 5784ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (DGV->getInitializer() != SInit) 5794ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner return Error(Err, "Global Variable Collision on '" + 5804ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner SGV->getType()->getDescription() +"':%"+SGV->getName()+ 5814ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner " - Global variables have different initializers"); 58272ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner } else if (DGV->hasLinkOnceLinkage() || DGV->hasWeakLinkage()) { 5834ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // Nothing is required, mapped values will take the new global 5844ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // automatically. 58557cb9883aa4c82357594d4186858f175135be3b1Chris Lattner } else if (SGV->hasLinkOnceLinkage() || SGV->hasWeakLinkage()) { 58657cb9883aa4c82357594d4186858f175135be3b1Chris Lattner // Nothing is required, mapped values will take the new global 58757cb9883aa4c82357594d4186858f175135be3b1Chris Lattner // automatically. 5884ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else if (DGV->hasAppendingLinkage()) { 5894ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(0 && "Appending linkage unimplemented!"); 5904ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else { 5914ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(0 && "Unknown linkage!"); 5924ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } 5938d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } else { 5948d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Copy the initializer over now... 5954ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner DGV->setInitializer(SInit); 5968d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 5978d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 5988d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 5998d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return false; 6008d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner} 6015c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 60279df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner// LinkFunctionProtos - Link the functions together between the two modules, 603c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// without doing function bodies... this just adds external function prototypes 604c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// to the Dest function... 6055c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 60679df7c0aaa18129e55968c8783ef8346807bd4afChris Lattnerstatic bool LinkFunctionProtos(Module *Dest, const Module *Src, 6075c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 6085c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 609b91b657e026e86082b665cc875c2881ed075b68dChris Lattner SymbolTable *ST = (SymbolTable*)&Dest->getSymbolTable(); 6105c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 611c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Loop over all of the functions in the src module, mapping them over as we 612c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // go 6135c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 6145c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner for (Module::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) { 61518961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const Function *SF = I; // SrcFunction 6164ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner Function *DF = 0; 6174ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (SF->hasName()) 61879df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner // The same named thing is a Function, because the only two things 61979df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner // that may be in a module level symbol table are Global Vars and 62079df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner // Functions, and they both have distinct, nonoverlapping, possible types. 6215c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 622fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner DF = cast_or_null<Function>(FindGlobalNamed(SF->getName(), SF->getType(), 623fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner ST)); 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); 6302719bac90525985f4ebb97324b4c087d47b54384Chris Lattner 6312719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // If the LLVM runtime renamed the function, but it is an externally 6322719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // visible symbol, DF must be an existing function with internal linkage. 6332719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // Rename it. 6342719bac90525985f4ebb97324b4c087d47b54384Chris Lattner if (NewDF->getName() != SF->getName() && !NewDF->hasInternalLinkage()) { 6352719bac90525985f4ebb97324b4c087d47b54384Chris Lattner assert(DF && DF->getName() == SF->getName() &&DF->hasInternalLinkage()); 6362719bac90525985f4ebb97324b4c087d47b54384Chris Lattner DF->setName(""); 6372719bac90525985f4ebb97324b4c087d47b54384Chris Lattner NewDF->setName(SF->getName()); // Force the name back 6382719bac90525985f4ebb97324b4c087d47b54384Chris Lattner DF->setName(SF->getName()); // This will cause a renaming 6392719bac90525985f4ebb97324b4c087d47b54384Chris Lattner assert(NewDF->getName() == SF->getName() && 6402719bac90525985f4ebb97324b4c087d47b54384Chris Lattner DF->getName() != SF->getName()); 6412719bac90525985f4ebb97324b4c087d47b54384Chris Lattner } 6424ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner 6434ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // ... and remember this mapping... 6442719bac90525985f4ebb97324b4c087d47b54384Chris Lattner ValueMap.insert(std::make_pair(SF, NewDF)); 645c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SF->isExternal()) { 646c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // If SF is external or if both SF & DF are external.. Just link the 647c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // external functions, we aren't adding anything. 648c2b97d43a074445c6856d69538a95de09450c26eChris Lattner ValueMap.insert(std::make_pair(SF, DF)); 649c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (DF->isExternal()) { // If DF is external but SF is not... 650c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // Link the external functions, update linkage qualifiers 651c2b97d43a074445c6856d69538a95de09450c26eChris Lattner ValueMap.insert(std::make_pair(SF, DF)); 652c2b97d43a074445c6856d69538a95de09450c26eChris Lattner DF->setLinkage(SF->getLinkage()); 653c2b97d43a074445c6856d69538a95de09450c26eChris Lattner 65435956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner } else if (SF->hasWeakLinkage() || SF->hasLinkOnceLinkage()) { 65572ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner // At this point we know that DF has LinkOnce, Weak, or External linkage. 65672ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner ValueMap.insert(std::make_pair(SF, DF)); 65772ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner 65835956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner // Linkonce+Weak = Weak 65935956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner if (DF->hasLinkOnceLinkage() && SF->hasWeakLinkage()) 66035956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner DF->setLinkage(SF->getLinkage()); 66135956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner 66235956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner } else if (DF->hasWeakLinkage() || DF->hasLinkOnceLinkage()) { 66372ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner // At this point we know that SF has LinkOnce or External linkage. 66472ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner ValueMap.insert(std::make_pair(SF, DF)); 66572ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner if (!SF->hasLinkOnceLinkage()) // Don't inherit linkonce linkage 66672ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner DF->setLinkage(SF->getLinkage()); 66772ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner 668c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SF->getLinkage() != DF->getLinkage()) { 6690fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner return Error(Err, "Functions named '" + SF->getName() + 6700fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner "' have different linkage specifiers!"); 671c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SF->hasExternalLinkage()) { 672c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // The function is defined in both modules!! 673c2b97d43a074445c6856d69538a95de09450c26eChris Lattner return Error(Err, "Function '" + 674c2b97d43a074445c6856d69538a95de09450c26eChris Lattner SF->getFunctionType()->getDescription() + "':\"" + 675c2b97d43a074445c6856d69538a95de09450c26eChris Lattner SF->getName() + "\" - Function is already defined!"); 676c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else { 677c2b97d43a074445c6856d69538a95de09450c26eChris Lattner assert(0 && "Unknown linkage configuration found!"); 6785c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 6795c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 6805c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 6815c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 6825c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 683c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBody - Copy the source function over into the dest function and 684c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// fix up references to values. At this point we know that Dest is an external 685c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function, and that Src is not. 6865c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 68779df7c0aaa18129e55968c8783ef8346807bd4afChris Lattnerstatic bool LinkFunctionBody(Function *Dest, const Function *Src, 6885c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &GlobalMap, 6895c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 6905c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner assert(Src && Dest && Dest->isExternal() && !Src->isExternal()); 6915c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> LocalMap; // Map for function local values 6925c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 693c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Go through and convert function arguments over... 69469da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner Function::aiterator DI = Dest->abegin(); 69518961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Function::const_aiterator I = Src->abegin(), E = Src->aend(); 69669da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner I != E; ++I, ++DI) { 69769da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner DI->setName(I->getName()); // Copy the name information over... 6985c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 6995c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Add a mapping to our local map 70069da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner LocalMap.insert(std::make_pair(I, DI)); 7015c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 7025c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 7035c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Loop over all of the basic blocks, copying the instructions over... 7045c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 70579df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner for (Function::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) { 706c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Create new basic block and add to mapping and the Dest function... 70718961504fc2b299578dba817900a0696cf3ccc4dChris Lattner BasicBlock *DBB = new BasicBlock(I->getName(), Dest); 70818961504fc2b299578dba817900a0696cf3ccc4dChris Lattner LocalMap.insert(std::make_pair(I, DBB)); 7095c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 7105c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Loop over all of the instructions in the src basic block, copying them 7115c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // over. Note that this is broken in a strict sense because the cloned 7125c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // instructions will still be referencing values in the Src module, not 7135c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // the remapped values. In our case, however, we will not get caught and 7145c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // so we can delay patching the values up until later... 7155c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 71618961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (BasicBlock::const_iterator II = I->begin(), IE = I->end(); 7175c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner II != IE; ++II) { 71818961504fc2b299578dba817900a0696cf3ccc4dChris Lattner Instruction *DI = II->clone(); 71918961504fc2b299578dba817900a0696cf3ccc4dChris Lattner DI->setName(II->getName()); 7205c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner DBB->getInstList().push_back(DI); 72118961504fc2b299578dba817900a0696cf3ccc4dChris Lattner LocalMap.insert(std::make_pair(II, DI)); 7225c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 7235c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 7245c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 725c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // At this point, all of the instructions and values of the function are now 726c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // copied over. The only problem is that they are still referencing values in 727c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // the Source function as operands. Loop through all of the operands of the 728c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // functions and patch them up to point to the local versions... 7295c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 73018961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Function::iterator BB = Dest->begin(), BE = Dest->end(); BB != BE; ++BB) 73118961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) 73218961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Instruction::op_iterator OI = I->op_begin(), OE = I->op_end(); 733221d688a5ef21a22c2368c9fff0e92d7966c95e5Chris Lattner OI != OE; ++OI) 734221d688a5ef21a22c2368c9fff0e92d7966c95e5Chris Lattner *OI = RemapOperand(*OI, LocalMap, &GlobalMap); 7355c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 7365c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 7375c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 7385c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 7395c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 740c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBodies - Link in the function bodies that are defined in the 741c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// source module into the DestModule. This consists basically of copying the 742c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function over and fixing up references to values. 7435c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 74479df7c0aaa18129e55968c8783ef8346807bd4afChris Lattnerstatic bool LinkFunctionBodies(Module *Dest, const Module *Src, 7455c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 7465c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 7475c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 748c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Loop over all of the functions in the src module, mapping them over as we 749c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // go 7505c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 75118961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Module::const_iterator SF = Src->begin(), E = Src->end(); SF != E; ++SF){ 75218961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (!SF->isExternal()) { // No body if function is external 75318961504fc2b299578dba817900a0696cf3ccc4dChris Lattner Function *DF = cast<Function>(ValueMap[SF]); // Destination function 754c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner 75518961504fc2b299578dba817900a0696cf3ccc4dChris Lattner // DF not external SF external? 75635956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner if (DF->isExternal()) { 75735956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner // Only provide the function body if there isn't one already. 75835956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner if (LinkFunctionBody(DF, SF, ValueMap, Err)) 75935956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner return true; 760c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner } 761c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner } 7625c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 7635c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 7645c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 7655c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 7668166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// LinkAppendingVars - If there were any appending global variables, link them 7678166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// together now. Return true on error. 7688166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// 7698166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattnerstatic bool LinkAppendingVars(Module *M, 7708166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 7718166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::string *ErrorMsg) { 7728166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (AppendingVars.empty()) return false; // Nothing to do. 7738166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 7748166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Loop over the multimap of appending vars, processing any variables with the 7758166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // same name, forming a new appending global variable with both of the 7768166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers merged together, then rewrite references to the old variables 7778166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // and delete them. 7788166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // 7798166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::vector<Constant*> Inits; 7808166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner while (AppendingVars.size() > 1) { 7818166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Get the first two elements in the map... 7828166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, 7838166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable*>::iterator Second = AppendingVars.begin(), First=Second++; 7848166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 7858166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If the first two elements are for different names, there is no pair... 7868166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Otherwise there is a pair, so link them together... 7878166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (First->first == Second->first) { 7888166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *G1 = First->second, *G2 = Second->second; 7898166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T1 = cast<ArrayType>(G1->getType()->getElementType()); 7908166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T2 = cast<ArrayType>(G2->getType()->getElementType()); 7918166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 7928166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Check to see that they two arrays agree on type... 7938166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (T1->getElementType() != T2->getElementType()) 7948166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 7958166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables with different element types need to be linked!"); 7968166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (G1->isConstant() != G2->isConstant()) 7978166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 7988166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables linked with different const'ness!"); 7998166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8008166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner unsigned NewSize = T1->getNumElements() + T2->getNumElements(); 8018166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner ArrayType *NewType = ArrayType::get(T1->getElementType(), NewSize); 8028166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8038166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Create the new global variable... 8048166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NG = 8058166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner new GlobalVariable(NewType, G1->isConstant(), G1->getLinkage(), 8068166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner /*init*/0, First->first, M); 8078166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8088166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Merge the initializer... 8098166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.reserve(NewSize); 810de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if (ConstantArray *I = dyn_cast<ConstantArray>(G1->getInitializer())) { 811de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i) 812de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(cast<Constant>(I->getValues()[i])); 813de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } else { 814de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner assert(isa<ConstantAggregateZero>(G1->getInitializer())); 815de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Constant *CV = Constant::getNullValue(T1->getElementType()); 816de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i) 817de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(CV); 818de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } 819de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if (ConstantArray *I = dyn_cast<ConstantArray>(G2->getInitializer())) { 820de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i) 821de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(cast<Constant>(I->getValues()[i])); 822de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } else { 823de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner assert(isa<ConstantAggregateZero>(G2->getInitializer())); 824de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Constant *CV = Constant::getNullValue(T2->getElementType()); 825de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i) 826de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(CV); 827de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } 8288166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner NG->setInitializer(ConstantArray::get(NewType, Inits)); 8298166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.clear(); 8308166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8318166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Replace any uses of the two global variables with uses of the new 8328166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // global... 8338166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8348166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // FIXME: This should rewrite simple/straight-forward uses such as 8358166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // getelementptr instructions to not use the Cast! 8368166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner ConstantPointerRef *NGCP = ConstantPointerRef::get(NG); 8378166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner G1->replaceAllUsesWith(ConstantExpr::getCast(NGCP, G1->getType())); 8388166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner G2->replaceAllUsesWith(ConstantExpr::getCast(NGCP, G2->getType())); 8398166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8408166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Remove the two globals from the module now... 8418166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G1); 8428166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G2); 8438166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8448166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Put the new global into the AppendingVars map so that we can handle 8458166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // linking of more than two vars... 8468166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Second->second = NG; 8478166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 8488166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.erase(First); 8498166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 8508166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8518166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return false; 8528166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner} 85352f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 85452f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 85552f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// LinkModules - This function links two modules together, with the resulting 85652f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// left module modified to be the composite of the two input modules. If an 85752f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// error occurs, true is returned and ErrorMsg (if not null) is set to indicate 8585c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// the problem. Upon failure, the Dest module could be in a modified state, and 8595c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// shouldn't be relied on to be consistent. 86052f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// 861f7703df4968084c18c248c1feea9961c19a32e6aChris Lattnerbool llvm::LinkModules(Module *Dest, const Module *Src, std::string *ErrorMsg) { 862873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner if (Dest->getEndianness() == Module::AnyEndianness) 863873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner Dest->setEndianness(Src->getEndianness()); 864873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner if (Dest->getPointerSize() == Module::AnyPointerSize) 865873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner Dest->setPointerSize(Src->getPointerSize()); 866873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner 867873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner if (Src->getEndianness() != Module::AnyEndianness && 868873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner Dest->getEndianness() != Src->getEndianness()) 86943a9994c0164848d44527060da72985c75183a48Chris Lattner std::cerr << "WARNING: Linking two modules of different endianness!\n"; 870873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner if (Src->getPointerSize() != Module::AnyPointerSize && 871873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner Dest->getPointerSize() != Src->getPointerSize()) 87243a9994c0164848d44527060da72985c75183a48Chris Lattner std::cerr << "WARNING: Linking two modules of different pointer size!\n"; 8732c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 8742c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // LinkTypes - Go through the symbol table of the Src module and see if any 8752c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // types are named in the src module that are not named in the Dst module. 8762c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Make sure there are no type name conflicts. 8772c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // 8782c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner if (LinkTypes(Dest, Src, ErrorMsg)) return true; 8792c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 8805c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // ValueMap - Mapping of values from what they used to be in Src, to what they 8815c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // are now in Dest. 8825c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 8835c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> ValueMap; 8845c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 8858166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars - Keep track of global variables in the destination module 8868166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // with appending linkage. After the module is linked together, they are 8878166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // appended and the module is rewritten. 8888166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // 8898166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> AppendingVars; 8908166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8918166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Add all of the appending globals already in the Dest module to 8928166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars. 8938166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner for (Module::giterator I = Dest->gbegin(), E = Dest->gend(); I != E; ++I) 894f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner if (I->hasAppendingLinkage()) 895f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner AppendingVars.insert(std::make_pair(I->getName(), I)); 8968166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8978166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Insert all of the globals in src into the Dest module... without linking 8988166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers (which could refer to functions not yet mapped over). 8998166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // 9008166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (LinkGlobals(Dest, Src, ValueMap, AppendingVars, ErrorMsg)) return true; 9015c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 902c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link the functions together between the two modules, without doing function 903c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // bodies... this just adds external function prototypes to the Dest 904c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // function... We do this so that when we begin processing function bodies, 905c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // all of the global values that may be referenced are available in our 906c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // ValueMap. 9075c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 90879df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner if (LinkFunctionProtos(Dest, Src, ValueMap, ErrorMsg)) return true; 9095c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 9106cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // Update the initializers in the Dest module now that all globals that may 9116cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // be referenced are in Dest. 9126cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // 9136cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner if (LinkGlobalInits(Dest, Src, ValueMap, ErrorMsg)) return true; 9146cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner 915c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link in the function bodies that are defined in the source module into the 916c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // DestModule. This consists basically of copying the function over and 917c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // fixing up references to values. 9185c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 91979df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner if (LinkFunctionBodies(Dest, Src, ValueMap, ErrorMsg)) return true; 92052f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 9218166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If there were any appending global variables, link them together now. 9228166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // 9238166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (LinkAppendingVars(Dest, AppendingVars, ErrorMsg)) return true; 9248166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 92552f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner return false; 92652f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner} 9279466f5113ba859677a28887c3c7143065e702019Vikram S. Adve 928