LinkModules.cpp revision 7b0c84dcf59b6ac3a27843fd8162ab36928fba35
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 19c837dd93cd20b7e37f70d9496ef63e213e4b4713Misha Brukman#include "llvm/Support/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" 26c28a224c68adf0464c275778af4bce762ad25d37Reid Spencer#include <iostream> 27c28a224c68adf0464c275778af4bce762ad25d37Reid Spencer 28f7703df4968084c18c248c1feea9961c19a32e6aChris Lattnerusing namespace llvm; 29d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke 305c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// Error - Simple wrapper function to conditionally assign to E and return true. 315c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// This just makes error return conditions a little bit simpler... 325c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 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 38700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 39700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Function: ResolveTypes() 40700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 41700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Description: 42700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Attempt to link the two specified types together. 43700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 44700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Inputs: 45700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// DestTy - The type to which we wish to resolve. 46700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// SrcTy - The original type which we want to resolve. 47700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Name - The name of the type. 48700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 49700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Outputs: 50700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// DestST - The symbol table in which the new type should be placed. 51700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// 52700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// Return value: 53700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// true - There is an error and the types cannot yet be linked. 54700867bb69ae1469f2b20005a79fd133e83fd552John Criswell// false - No errors. 554c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner// 56e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattnerstatic bool ResolveTypes(const Type *DestTy, const Type *SrcTy, 57e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner SymbolTable *DestST, const std::string &Name) { 58e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DestTy == SrcTy) return false; // If already equal, noop 59e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 604c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Does the type already exist in the module? 614c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (DestTy && !isa<OpaqueType>(DestTy)) { // Yup, the type already exists... 62e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (const OpaqueType *OT = dyn_cast<OpaqueType>(SrcTy)) { 63e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner const_cast<OpaqueType*>(OT)->refineAbstractTypeTo(DestTy); 644c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } else { 654c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner return true; // Cannot link types... neither is opaque and not-equal 664c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 674c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } else { // Type not in dest module. Add it now. 684c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (DestTy) // Type _is_ in module, just opaque... 69e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner const_cast<OpaqueType*>(cast<OpaqueType>(DestTy)) 70e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner ->refineAbstractTypeTo(SrcTy); 71fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner else if (!Name.empty()) 72e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner DestST->insert(Name, const_cast<Type*>(SrcTy)); 734c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 744c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner return false; 754c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner} 764c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 7743f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattnerstatic const FunctionType *getFT(const PATypeHolder &TH) { 7843f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return cast<FunctionType>(TH.get()); 7943f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner} 809732be769e57f1dec03f046ab957053048f60e40Chris Lattnerstatic const StructType *getST(const PATypeHolder &TH) { 8143f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return cast<StructType>(TH.get()); 8243f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner} 83e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 84e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// RecursiveResolveTypes - This is just like ResolveTypes, except that it 85e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// recurses down into derived types, merging the used types if the parent types 86e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// are compatible. 87e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner// 88e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattnerstatic bool RecursiveResolveTypesI(const PATypeHolder &DestTy, 89e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner const PATypeHolder &SrcTy, 90e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner SymbolTable *DestST, const std::string &Name, 91e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner std::vector<std::pair<PATypeHolder, PATypeHolder> > &Pointers) { 9243f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner const Type *SrcTyT = SrcTy.get(); 9343f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner const Type *DestTyT = DestTy.get(); 9443f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner if (DestTyT == SrcTyT) return false; // If already equal, noop 95e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 96e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // If we found our opaque type, resolve it now! 9743f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner if (isa<OpaqueType>(DestTyT) || isa<OpaqueType>(SrcTyT)) 9843f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return ResolveTypes(DestTyT, SrcTyT, DestST, Name); 99e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 100e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Two types cannot be resolved together if they are of different primitive 101e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // type. For example, we cannot resolve an int to a float. 102f70c22b019494723d0e706f93d6542dfaa6e73a5Chris Lattner if (DestTyT->getTypeID() != SrcTyT->getTypeID()) return true; 103e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 104e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Otherwise, resolve the used type used by this derived type... 105f70c22b019494723d0e706f93d6542dfaa6e73a5Chris Lattner switch (DestTyT->getTypeID()) { 106e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::FunctionTyID: { 10743f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner if (cast<FunctionType>(DestTyT)->isVarArg() != 108841e00b96295a2b66cb7573e961656d28a6cb12bChris Lattner cast<FunctionType>(SrcTyT)->isVarArg() || 109841e00b96295a2b66cb7573e961656d28a6cb12bChris Lattner cast<FunctionType>(DestTyT)->getNumContainedTypes() != 110841e00b96295a2b66cb7573e961656d28a6cb12bChris Lattner cast<FunctionType>(SrcTyT)->getNumContainedTypes()) 11143f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner return true; 11243f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner for (unsigned i = 0, e = getFT(DestTy)->getNumContainedTypes(); i != e; ++i) 113e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner if (RecursiveResolveTypesI(getFT(DestTy)->getContainedType(i), 114e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner getFT(SrcTy)->getContainedType(i), DestST, "", 115e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner Pointers)) 116e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return true; 117e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return false; 118e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 119e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::StructTyID: { 12043f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner if (getST(DestTy)->getNumContainedTypes() != 12143f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner getST(SrcTy)->getNumContainedTypes()) return 1; 12243f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner for (unsigned i = 0, e = getST(DestTy)->getNumContainedTypes(); i != e; ++i) 123e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner if (RecursiveResolveTypesI(getST(DestTy)->getContainedType(i), 124e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner getST(SrcTy)->getContainedType(i), DestST, "", 125e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner Pointers)) 126e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return true; 127e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner return false; 128e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 129e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner case Type::ArrayTyID: { 13043f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner const ArrayType *DAT = cast<ArrayType>(DestTy.get()); 13143f4ba8c7d19664bb5de73a7b391b67061f25d22Chris Lattner const ArrayType *SAT = cast<ArrayType>(SrcTy.get()); 132e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DAT->getNumElements() != SAT->getNumElements()) return true; 133e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner return RecursiveResolveTypesI(DAT->getElementType(), SAT->getElementType(), 134e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner DestST, "", Pointers); 135e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner } 136e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner case Type::PointerTyID: { 137e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // If this is a pointer type, check to see if we have already seen it. If 138e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // so, we are in a recursive branch. Cut off the search now. We cannot use 139e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // an associative container for this search, because the type pointers (keys 140e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // in the container) change whenever types get resolved... 141e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // 142e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner for (unsigned i = 0, e = Pointers.size(); i != e; ++i) 143e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner if (Pointers[i].first == DestTy) 144e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner return Pointers[i].second != SrcTy; 145e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner 146e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // Otherwise, add the current pointers to the vector to stop recursion on 147e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner // this pair. 148e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner Pointers.push_back(std::make_pair(DestTyT, SrcTyT)); 149e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner bool Result = 150e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner RecursiveResolveTypesI(cast<PointerType>(DestTy.get())->getElementType(), 151e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner cast<PointerType>(SrcTy.get())->getElementType(), 152e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner DestST, "", Pointers); 153e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner Pointers.pop_back(); 154e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner return Result; 155e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 156e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner default: assert(0 && "Unexpected type!"); return true; 157e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 158e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner} 159e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 160e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattnerstatic bool RecursiveResolveTypes(const PATypeHolder &DestTy, 161e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner const PATypeHolder &SrcTy, 162e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner SymbolTable *DestST, const std::string &Name){ 163e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner std::vector<std::pair<PATypeHolder, PATypeHolder> > PointerTypes; 164e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner return RecursiveResolveTypesI(DestTy, SrcTy, DestST, Name, PointerTypes); 165e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner} 166e3092c94ad2e3af96f37a0a8186149acbbd9700aChris Lattner 167e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 1682c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// LinkTypes - Go through the symbol table of the Src module and see if any 1692c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// types are named in the src module that are not named in the Dst module. 1702c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// Make sure there are no type name conflicts. 1712c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner// 1725c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic bool LinkTypes(Module *Dest, const Module *Src, std::string *Err) { 1736e6026b46569b01f8f6d4dcdb6c899c3a9c76b3eChris Lattner SymbolTable *DestST = &Dest->getSymbolTable(); 1746e6026b46569b01f8f6d4dcdb6c899c3a9c76b3eChris Lattner const SymbolTable *SrcST = &Src->getSymbolTable(); 1752c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 1762c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Look for a type plane for Type's... 177567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer SymbolTable::type_const_iterator TI = SrcST->type_begin(); 178567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer SymbolTable::type_const_iterator TE = SrcST->type_end(); 179567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer if (TI == TE) return false; // No named types, do nothing. 1802c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 181cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // Some types cannot be resolved immediately because they depend on other 182cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // types being resolved to each other first. This contains a list of types we 183cf00c4ab3ba308d45d98c5ccab87362cf802facbMisha Brukman // are waiting to recheck. 1844c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner std::vector<std::string> DelayedTypesToResolve; 1854c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 186567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer for ( ; TI != TE; ++TI ) { 187567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer const std::string &Name = TI->first; 188c28a224c68adf0464c275778af4bce762ad25d37Reid Spencer const Type *RHS = TI->second; 1892c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 1902c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Check to see if this type name is already in the dest module... 191567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer Type *Entry = DestST->lookupType(Name); 1924c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 1934c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (ResolveTypes(Entry, RHS, DestST, Name)) { 1944c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // They look different, save the types 'till later to resolve. 1954c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner DelayedTypesToResolve.push_back(Name); 1964c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 1974c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 1984c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 1994c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Iteratively resolve types while we can... 2004c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner while (!DelayedTypesToResolve.empty()) { 2014c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Loop over all of the types, attempting to resolve them if possible... 2024c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner unsigned OldSize = DelayedTypesToResolve.size(); 2034c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 204e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Try direct resolution by name... 2054c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner for (unsigned i = 0; i != DelayedTypesToResolve.size(); ++i) { 2064c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner const std::string &Name = DelayedTypesToResolve[i]; 207567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer Type *T1 = SrcST->lookupType(Name); 208567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer Type *T2 = DestST->lookupType(Name); 2094c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (!ResolveTypes(T2, T1, DestST, Name)) { 2104c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // We are making progress! 2114c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i); 2124c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner --i; 2132f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner } 2144c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 2152f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner 2164c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner // Did we not eliminate any types? 2174c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner if (DelayedTypesToResolve.size() == OldSize) { 218e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Attempt to resolve subelements of types. This allows us to merge these 219e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // two types: { int* } and { opaque* } 2204c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner for (unsigned i = 0, e = DelayedTypesToResolve.size(); i != e; ++i) { 2214c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner const std::string &Name = DelayedTypesToResolve[i]; 222567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer PATypeHolder T1(SrcST->lookupType(Name)); 223567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer PATypeHolder T2(DestST->lookupType(Name)); 224e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 225e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (!RecursiveResolveTypes(T2, T1, DestST, Name)) { 226e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // We are making progress! 227e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i); 228e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 229e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // Go back to the main loop, perhaps we can resolve directly by name 230e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // now... 231e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner break; 232e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 233e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner } 234e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner 235e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner // If we STILL cannot resolve the types, then there is something wrong. 236aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner // Report the warning and delete one of the names. 237e76c57ad467ed57f09f2a3ef51628d4b6eb2b304Chris Lattner if (DelayedTypesToResolve.size() == OldSize) { 238aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner const std::string &Name = DelayedTypesToResolve.back(); 239aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner 240567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer const Type *T1 = SrcST->lookupType(Name); 241567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer const Type *T2 = DestST->lookupType(Name); 242aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner std::cerr << "WARNING: Type conflict between types named '" << Name 243adbc0b5287bf36893cdcae2440d48b3cb3489e38Chris Lattner << "'.\n Src='"; 244adbc0b5287bf36893cdcae2440d48b3cb3489e38Chris Lattner WriteTypeSymbolic(std::cerr, T1, Src); 245adbc0b5287bf36893cdcae2440d48b3cb3489e38Chris Lattner std::cerr << "'.\n Dest='"; 246adbc0b5287bf36893cdcae2440d48b3cb3489e38Chris Lattner WriteTypeSymbolic(std::cerr, T2, Dest); 247adbc0b5287bf36893cdcae2440d48b3cb3489e38Chris Lattner std::cerr << "'\n"; 248aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner 249aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner // Remove the symbol name from the destination. 250aeb18ce9c012f8554f48bae9bb32351c6eeaa26cChris Lattner DelayedTypesToResolve.pop_back(); 2514c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner } 2522c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner } 2532c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner } 2544c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 2554c00e53b81de81ecf4ba0c4e287ea230c79e82aeChris Lattner 2562c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner return false; 2572c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner} 2582c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 2595c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic void PrintMap(const std::map<const Value*, Value*> &M) { 2605c2d335d86579941b71816196a95a64b277e8963Chris Lattner for (std::map<const Value*, Value*>::const_iterator I = M.begin(), E =M.end(); 2612d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner I != E; ++I) { 2625c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << " Fr: " << (void*)I->first << " "; 26387182ae6baf28ca6da6ee4bc00cf1857f293acfeChris Lattner I->first->dump(); 2645c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << " To: " << (void*)I->second << " "; 26587182ae6baf28ca6da6ee4bc00cf1857f293acfeChris Lattner I->second->dump(); 2665c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << "\n"; 2672d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner } 2682d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner} 2692d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 2702d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 2715c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// RemapOperand - Use LocalMap and GlobalMap to convert references from one 2725c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// module to another. This is somewhat sophisticated in that it can 2735c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// automatically handle constant references correctly as well... 2745c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 2755c2d335d86579941b71816196a95a64b277e8963Chris Lattnerstatic Value *RemapOperand(const Value *In, 2765c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &LocalMap, 2775c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> *GlobalMap) { 2785c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*,Value*>::const_iterator I = LocalMap.find(In); 2795c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner if (I != LocalMap.end()) return I->second; 2805c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 2815c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner if (GlobalMap) { 2825c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner I = GlobalMap->find(In); 2835c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner if (I != GlobalMap->end()) return I->second; 2845c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 2855c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 2868d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Check to see if it's a constant that we are interesting in transforming... 28718961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (const Constant *CPV = dyn_cast<Constant>(In)) { 288de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if ((!isa<DerivedType>(CPV->getType()) && !isa<ConstantExpr>(CPV)) || 289de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner isa<ConstantAggregateZero>(CPV)) 29018961504fc2b299578dba817900a0696cf3ccc4dChris Lattner return const_cast<Constant*>(CPV); // Simple constants stay identical... 2918d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 292e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Constant *Result = 0; 2938d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 29418961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (const ConstantArray *CPA = dyn_cast<ConstantArray>(CPV)) { 295697954c15da58bd8b186dbafdedd8b06db770201Chris Lattner const std::vector<Use> &Ops = CPA->getValues(); 296697954c15da58bd8b186dbafdedd8b06db770201Chris Lattner std::vector<Constant*> Operands(Ops.size()); 297e306d94782b1c608857738279852dcc050c66004Chris Lattner for (unsigned i = 0, e = Ops.size(); i != e; ++i) 2988d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner Operands[i] = 299e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner cast<Constant>(RemapOperand(Ops[i], LocalMap, GlobalMap)); 300e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Result = ConstantArray::get(cast<ArrayType>(CPA->getType()), Operands); 30118961504fc2b299578dba817900a0696cf3ccc4dChris Lattner } else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(CPV)) { 302697954c15da58bd8b186dbafdedd8b06db770201Chris Lattner const std::vector<Use> &Ops = CPS->getValues(); 303697954c15da58bd8b186dbafdedd8b06db770201Chris Lattner std::vector<Constant*> Operands(Ops.size()); 3048d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner for (unsigned i = 0; i < Ops.size(); ++i) 3058d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner Operands[i] = 306e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner cast<Constant>(RemapOperand(Ops[i], LocalMap, GlobalMap)); 307e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner Result = ConstantStruct::get(cast<StructType>(CPS->getType()), Operands); 308e9bb2df410f7a22decad9a883f7139d5857c1520Chris Lattner } else if (isa<ConstantPointerNull>(CPV)) { 30918961504fc2b299578dba817900a0696cf3ccc4dChris Lattner Result = const_cast<Constant*>(CPV); 31000dc4796132933e76fe2b834ca087e42621c175aReid Spencer } else if (isa<GlobalValue>(CPV)) { 31100dc4796132933e76fe2b834ca087e42621c175aReid Spencer Result = cast<Constant>(RemapOperand(CPV, LocalMap, GlobalMap)); 3126cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) { 313b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner if (CE->getOpcode() == Instruction::GetElementPtr) { 314b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner Value *Ptr = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap); 315b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner std::vector<Constant*> Indices; 316b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner Indices.reserve(CE->getNumOperands()-1); 317b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i) 318b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner Indices.push_back(cast<Constant>(RemapOperand(CE->getOperand(i), 319b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner LocalMap, GlobalMap))); 320b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner 321b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner Result = ConstantExpr::getGetElementPtr(cast<Constant>(Ptr), Indices); 322b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner } else if (CE->getNumOperands() == 1) { 323ad333484ea5ae976b83e35ccd3f6cfa6e71290e2Chris Lattner // Cast instruction 324ad333484ea5ae976b83e35ccd3f6cfa6e71290e2Chris Lattner assert(CE->getOpcode() == Instruction::Cast); 3256cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner Value *V = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap); 326ad333484ea5ae976b83e35ccd3f6cfa6e71290e2Chris Lattner Result = ConstantExpr::getCast(cast<Constant>(V), CE->getType()); 3271438102576b94d6dac9bb18e8df291c4d632572dChris Lattner } else if (CE->getNumOperands() == 3) { 3281438102576b94d6dac9bb18e8df291c4d632572dChris Lattner // Select instruction 3291438102576b94d6dac9bb18e8df291c4d632572dChris Lattner assert(CE->getOpcode() == Instruction::Select); 3301438102576b94d6dac9bb18e8df291c4d632572dChris Lattner Value *V1 = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap); 3311438102576b94d6dac9bb18e8df291c4d632572dChris Lattner Value *V2 = RemapOperand(CE->getOperand(1), LocalMap, GlobalMap); 3321438102576b94d6dac9bb18e8df291c4d632572dChris Lattner Value *V3 = RemapOperand(CE->getOperand(2), LocalMap, GlobalMap); 3331438102576b94d6dac9bb18e8df291c4d632572dChris Lattner Result = ConstantExpr::getSelect(cast<Constant>(V1), cast<Constant>(V2), 3341438102576b94d6dac9bb18e8df291c4d632572dChris Lattner cast<Constant>(V3)); 3356cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } else if (CE->getNumOperands() == 2) { 3366cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // Binary operator... 3376cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner Value *V1 = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap); 3386cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner Value *V2 = RemapOperand(CE->getOperand(1), LocalMap, GlobalMap); 3396cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner 3406cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner Result = ConstantExpr::get(CE->getOpcode(), cast<Constant>(V1), 341d981f8af79be9ea647d593531091740a3a27a85fChris Lattner cast<Constant>(V2)); 3426cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } else { 343b319faff77a5bb12e753c45662f6c532b77f0b91Chris Lattner assert(0 && "Unknown constant expr type!"); 3446cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner } 3456cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner 3468d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } else { 3478d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner assert(0 && "Unknown type of derived type constant value!"); 3488d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 3498d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 3508d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Cache the mapping in our local map structure... 351d149c053cdbb406b7b5dff24127b4c509420893eChris Lattner if (GlobalMap) 352d149c053cdbb406b7b5dff24127b4c509420893eChris Lattner GlobalMap->insert(std::make_pair(In, Result)); 353d149c053cdbb406b7b5dff24127b4c509420893eChris Lattner else 354d149c053cdbb406b7b5dff24127b4c509420893eChris Lattner LocalMap.insert(std::make_pair(In, Result)); 3558d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return Result; 3568d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 3572d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 3585c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << "XXX LocalMap: \n"; 3592d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner PrintMap(LocalMap); 3602d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 3612d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner if (GlobalMap) { 3625c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << "XXX GlobalMap: \n"; 3632d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner PrintMap(*GlobalMap); 3642d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner } 3652d3e8bba628843bf2dffa21f69d9b45098d3bfc4Chris Lattner 3665c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::cerr << "Couldn't remap value: " << (void*)In << " " << *In << "\n"; 3678d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner assert(0 && "Couldn't remap value!"); 3688d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return 0; 3695c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 3705c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 371fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner/// FindGlobalNamed - Look in the specified symbol table for a global with the 372fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner/// specified name and type. If an exactly matching global does not exist, see 373fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner/// if there is a global which is "type compatible" with the specified 374fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner/// name/type. This allows us to resolve things like '%x = global int*' with 375fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner/// '%x = global opaque*'. 376fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner/// 377fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattnerstatic GlobalValue *FindGlobalNamed(const std::string &Name, const Type *Ty, 378fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner SymbolTable *ST) { 379fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner // See if an exact match exists in the symbol table... 380fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner if (Value *V = ST->lookup(Ty, Name)) return cast<GlobalValue>(V); 381c003628a612d3687fb77088a5894314210a65385Chris Lattner 382fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner // It doesn't exist exactly, scan through all of the type planes in the symbol 383fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner // table, checking each of them for a type-compatible version. 384fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner // 385fe41069070f1a4b2d58a996b1f82ff747d076435Chris Lattner for (SymbolTable::plane_iterator PI = ST->plane_begin(), PE = ST->plane_end(); 386567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer PI != PE; ++PI) { 387567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer // Does this type plane contain an entry with the specified name? 388fe41069070f1a4b2d58a996b1f82ff747d076435Chris Lattner SymbolTable::ValueMap &VM = PI->second; 389567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer SymbolTable::value_iterator VI = VM.find(Name); 390fe41069070f1a4b2d58a996b1f82ff747d076435Chris Lattner 391fe41069070f1a4b2d58a996b1f82ff747d076435Chris Lattner if (VI != VM.end()) { 392fe41069070f1a4b2d58a996b1f82ff747d076435Chris Lattner // Ensure that this type if placed correctly into the symbol table. 393fe41069070f1a4b2d58a996b1f82ff747d076435Chris Lattner GlobalValue *ValPtr = cast<GlobalValue>(VI->second); 394fe41069070f1a4b2d58a996b1f82ff747d076435Chris Lattner assert(ValPtr->getType() == PI->first && "Type conflict!"); 395fe41069070f1a4b2d58a996b1f82ff747d076435Chris Lattner 396fe41069070f1a4b2d58a996b1f82ff747d076435Chris Lattner // Determine whether we can fold the two types together, resolving them. 397fe41069070f1a4b2d58a996b1f82ff747d076435Chris Lattner // If so, we can use this value. 398fe41069070f1a4b2d58a996b1f82ff747d076435Chris Lattner if (!ValPtr->hasInternalLinkage() && 399fe41069070f1a4b2d58a996b1f82ff747d076435Chris Lattner !RecursiveResolveTypes(Ty, PI->first, ST, "")) 400fe41069070f1a4b2d58a996b1f82ff747d076435Chris Lattner return ValPtr; 401fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner } 402fe41069070f1a4b2d58a996b1f82ff747d076435Chris Lattner } 403fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner return 0; // Otherwise, nothing could be found. 404fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner} 405fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner 406c003628a612d3687fb77088a5894314210a65385Chris Lattner/// ForceRenaming - The LLVM SymbolTable class autorenames globals that conflict 407c003628a612d3687fb77088a5894314210a65385Chris Lattner/// in the symbol table. This is good for all clients except for us. Go 408c003628a612d3687fb77088a5894314210a65385Chris Lattner/// through the trouble to force this back. 409c003628a612d3687fb77088a5894314210a65385Chris Lattnerstatic void ForceRenaming(GlobalValue *GV, const std::string &Name) { 410c003628a612d3687fb77088a5894314210a65385Chris Lattner assert(GV->getName() != Name && "Can't force rename to self"); 411c003628a612d3687fb77088a5894314210a65385Chris Lattner SymbolTable &ST = GV->getParent()->getSymbolTable(); 412c003628a612d3687fb77088a5894314210a65385Chris Lattner 413c003628a612d3687fb77088a5894314210a65385Chris Lattner // If there is a conflict, rename the conflict. 414c003628a612d3687fb77088a5894314210a65385Chris Lattner Value *ConflictVal = ST.lookup(GV->getType(), Name); 415c003628a612d3687fb77088a5894314210a65385Chris Lattner assert(ConflictVal&&"Why do we have to force rename if there is no conflic?"); 416c003628a612d3687fb77088a5894314210a65385Chris Lattner GlobalValue *ConflictGV = cast<GlobalValue>(ConflictVal); 417c003628a612d3687fb77088a5894314210a65385Chris Lattner assert(ConflictGV->hasInternalLinkage() && 418c003628a612d3687fb77088a5894314210a65385Chris Lattner "Not conflicting with a static global, should link instead!"); 419c003628a612d3687fb77088a5894314210a65385Chris Lattner 420c003628a612d3687fb77088a5894314210a65385Chris Lattner ConflictGV->setName(""); // Eliminate the conflict 421c003628a612d3687fb77088a5894314210a65385Chris Lattner GV->setName(Name); // Force the name back 422c003628a612d3687fb77088a5894314210a65385Chris Lattner ConflictGV->setName(Name); // This will cause ConflictGV to get renamed 4237b0c84dcf59b6ac3a27843fd8162ab36928fba35Chris Lattner assert(GV->getName() == Name && ConflictGV->getName() != Name && 424c003628a612d3687fb77088a5894314210a65385Chris Lattner "ForceRenaming didn't work"); 425c003628a612d3687fb77088a5894314210a65385Chris Lattner} 426c003628a612d3687fb77088a5894314210a65385Chris Lattner 4275c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4285c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// LinkGlobals - Loop through the global variables in the src module and merge 4298166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// them into the dest module. 4305c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 4315c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattnerstatic bool LinkGlobals(Module *Dest, const Module *Src, 4325c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 4338166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 4345c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 4355c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // We will need a module level symbol table if the src module has a module 4365c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // level symbol table... 437b91b657e026e86082b665cc875c2881ed075b68dChris Lattner SymbolTable *ST = (SymbolTable*)&Dest->getSymbolTable(); 4385c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4395c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 4405c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 4415c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner for (Module::const_giterator I = Src->gbegin(), E = Src->gend(); I != E; ++I){ 44218961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const GlobalVariable *SGV = I; 4434ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner GlobalVariable *DGV = 0; 444fe41069070f1a4b2d58a996b1f82ff747d076435Chris Lattner if (SGV->hasName() && !SGV->hasInternalLinkage()) { 4454ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // A same named thing is a global variable, because the only two things 44679df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner // that may be in a module level symbol table are Global Vars and 44779df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner // Functions, and they both have distinct, nonoverlapping, possible types. 4485c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 449fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner DGV = cast_or_null<GlobalVariable>(FindGlobalNamed(SGV->getName(), 450fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner SGV->getType(), ST)); 4514ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } 4525c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4534ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(SGV->hasInitializer() || SGV->hasExternalLinkage() && 4544ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner "Global must either be external or have an initializer!"); 4555c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4560fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner bool SGExtern = SGV->isExternal(); 4570fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner bool DGExtern = DGV ? DGV->isExternal() : false; 4580fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner 4594ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (!DGV || DGV->hasInternalLinkage() || SGV->hasInternalLinkage()) { 4605c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // No linking to be performed, simply create an identical version of the 4618d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // symbol over in the dest module... the initializer will be filled in 4628d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // later by LinkGlobalInits... 4638d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // 4642719bac90525985f4ebb97324b4c087d47b54384Chris Lattner GlobalVariable *NewDGV = 4652719bac90525985f4ebb97324b4c087d47b54384Chris Lattner new GlobalVariable(SGV->getType()->getElementType(), 4662719bac90525985f4ebb97324b4c087d47b54384Chris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 4672719bac90525985f4ebb97324b4c087d47b54384Chris Lattner SGV->getName(), Dest); 4682719bac90525985f4ebb97324b4c087d47b54384Chris Lattner 4692719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // If the LLVM runtime renamed the global, but it is an externally visible 4702719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // symbol, DGV must be an existing global with internal linkage. Rename 4712719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // it. 472c003628a612d3687fb77088a5894314210a65385Chris Lattner if (NewDGV->getName() != SGV->getName() && !NewDGV->hasInternalLinkage()) 473c003628a612d3687fb77088a5894314210a65385Chris Lattner ForceRenaming(NewDGV, SGV->getName()); 4745c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 4755c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Make sure to remember this mapping... 4762719bac90525985f4ebb97324b4c087d47b54384Chris Lattner ValueMap.insert(std::make_pair(SGV, NewDGV)); 4778166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (SGV->hasAppendingLinkage()) 4788166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Keep track that this is an appending variable... 4798166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV)); 4808166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 481c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SGV->isExternal()) { 482c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // If SGV is external or if both SGV & DGV are external.. Just link the 483c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // external globals, we aren't adding anything. 484c2b97d43a074445c6856d69538a95de09450c26eChris Lattner ValueMap.insert(std::make_pair(SGV, DGV)); 485c2b97d43a074445c6856d69538a95de09450c26eChris Lattner 486c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (DGV->isExternal()) { // If DGV is external but SGV is not... 487c2b97d43a074445c6856d69538a95de09450c26eChris Lattner ValueMap.insert(std::make_pair(SGV, DGV)); 488c2b97d43a074445c6856d69538a95de09450c26eChris Lattner DGV->setLinkage(SGV->getLinkage()); // Inherit linkage! 48935956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner } else if (SGV->hasWeakLinkage() || SGV->hasLinkOnceLinkage()) { 49072ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner // At this point we know that DGV has LinkOnce, Appending, Weak, or 49172ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner // External linkage. If DGV is Appending, this is an error. 49272ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner if (DGV->hasAppendingLinkage()) 49372ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner return Error(Err, "Linking globals named '" + SGV->getName() + 49472ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner " ' with 'weak' and 'appending' linkage is not allowed!"); 49535956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner 49635956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner if (SGV->isConstant() != DGV->isConstant()) 49735956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner return Error(Err, "Global Variable Collision on '" + 49835956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner SGV->getType()->getDescription() + " %" + SGV->getName() + 49935956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner "' - Global variables differ in const'ness"); 50035956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner 50172ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner // Otherwise, just perform the link. 50272ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner ValueMap.insert(std::make_pair(SGV, DGV)); 50335956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner 50435956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner // Linkonce+Weak = Weak 50535956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner if (DGV->hasLinkOnceLinkage() && SGV->hasWeakLinkage()) 50635956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner DGV->setLinkage(SGV->getLinkage()); 50735956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner 50835956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner } else if (DGV->hasWeakLinkage() || DGV->hasLinkOnceLinkage()) { 50972ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner // At this point we know that SGV has LinkOnce, Appending, or External 51072ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner // linkage. If SGV is Appending, this is an error. 51172ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner if (SGV->hasAppendingLinkage()) 51272ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner return Error(Err, "Linking globals named '" + SGV->getName() + 51372ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner " ' with 'weak' and 'appending' linkage is not allowed!"); 51435956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner 51535956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner if (SGV->isConstant() != DGV->isConstant()) 51635956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner return Error(Err, "Global Variable Collision on '" + 51735956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner SGV->getType()->getDescription() + " %" + SGV->getName() + 51835956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner "' - Global variables differ in const'ness"); 51935956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner 52072ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner if (!SGV->hasLinkOnceLinkage()) 52172ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner DGV->setLinkage(SGV->getLinkage()); // Inherit linkage! 52272ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner ValueMap.insert(std::make_pair(SGV, DGV)); 52372ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner 524c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SGV->getLinkage() != DGV->getLinkage()) { 5254ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner return Error(Err, "Global variables named '" + SGV->getName() + 5264ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner "' have different linkage specifiers!"); 527c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SGV->hasExternalLinkage()) { 528c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // Allow linking two exactly identical external global variables... 529f85770c9a670dc5c360015125389c389ae9592c7Chris Lattner if (SGV->isConstant() != DGV->isConstant()) 530c2b97d43a074445c6856d69538a95de09450c26eChris Lattner return Error(Err, "Global Variable Collision on '" + 531c2b97d43a074445c6856d69538a95de09450c26eChris Lattner SGV->getType()->getDescription() + " %" + SGV->getName() + 532c2b97d43a074445c6856d69538a95de09450c26eChris Lattner "' - Global variables differ in const'ness"); 533f85770c9a670dc5c360015125389c389ae9592c7Chris Lattner 534f85770c9a670dc5c360015125389c389ae9592c7Chris Lattner if (SGV->getInitializer() != DGV->getInitializer()) 535f85770c9a670dc5c360015125389c389ae9592c7Chris Lattner return Error(Err, "Global Variable Collision on '" + 536f85770c9a670dc5c360015125389c389ae9592c7Chris Lattner SGV->getType()->getDescription() + " %" + SGV->getName() + 537f85770c9a670dc5c360015125389c389ae9592c7Chris Lattner "' - External linkage globals have different initializers"); 538f85770c9a670dc5c360015125389c389ae9592c7Chris Lattner 539c2b97d43a074445c6856d69538a95de09450c26eChris Lattner ValueMap.insert(std::make_pair(SGV, DGV)); 540c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SGV->hasAppendingLinkage()) { 5418166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // No linking is performed yet. Just insert a new copy of the global, and 5428166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // keep track of the fact that it is an appending variable in the 5438166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars map. The name is cleared out so that no linkage is 5448166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // performed. 5458166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NewDGV = 5468166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner new GlobalVariable(SGV->getType()->getElementType(), 5478166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner SGV->isConstant(), SGV->getLinkage(), /*init*/0, 5488166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "", Dest); 5498166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 5508166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Make sure to remember this mapping... 5518166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner ValueMap.insert(std::make_pair(SGV, NewDGV)); 5528166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 5538166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Keep track that this is an appending variable... 5548166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV)); 5554ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else { 5564ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(0 && "Unknown linkage!"); 5575c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 5585c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 5595c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 5605c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 5615c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 5625c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 5638d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// LinkGlobalInits - Update the initializers in the Dest module now that all 5648d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// globals that may be referenced are in Dest. 5658d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner// 5668d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattnerstatic bool LinkGlobalInits(Module *Dest, const Module *Src, 5675c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 5685c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 5698d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 5708d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Loop over all of the globals in the src module, mapping them over as we go 5718d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // 5728d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner for (Module::const_giterator I = Src->gbegin(), E = Src->gend(); I != E; ++I){ 57318961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const GlobalVariable *SGV = I; 5748d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 5758d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner if (SGV->hasInitializer()) { // Only process initialized GV's 5768d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Figure out what the initializer looks like in the dest module... 5774ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner Constant *SInit = 5782f6bb2bce13084dfc4c8acf47f9eae0578267aaaChris Lattner cast<Constant>(RemapOperand(SGV->getInitializer(), ValueMap, 0)); 5798d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner 5808d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner GlobalVariable *DGV = cast<GlobalVariable>(ValueMap[SGV]); 5814ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (DGV->hasInitializer()) { 5824ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (SGV->hasExternalLinkage()) { 5834ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (DGV->getInitializer() != SInit) 5844ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner return Error(Err, "Global Variable Collision on '" + 5854ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner SGV->getType()->getDescription() +"':%"+SGV->getName()+ 5864ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner " - Global variables have different initializers"); 58772ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner } else if (DGV->hasLinkOnceLinkage() || DGV->hasWeakLinkage()) { 5884ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // Nothing is required, mapped values will take the new global 5894ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // automatically. 59057cb9883aa4c82357594d4186858f175135be3b1Chris Lattner } else if (SGV->hasLinkOnceLinkage() || SGV->hasWeakLinkage()) { 59157cb9883aa4c82357594d4186858f175135be3b1Chris Lattner // Nothing is required, mapped values will take the new global 59257cb9883aa4c82357594d4186858f175135be3b1Chris Lattner // automatically. 5934ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else if (DGV->hasAppendingLinkage()) { 5944ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(0 && "Appending linkage unimplemented!"); 5954ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } else { 5964ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner assert(0 && "Unknown linkage!"); 5974ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner } 5988d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } else { 5998d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner // Copy the initializer over now... 6004ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner DGV->setInitializer(SInit); 6018d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 6028d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 6038d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner } 6048d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner return false; 6058d2de8a82cce67513debee7a3fa5aca0189b4105Chris Lattner} 6065c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 60779df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner// LinkFunctionProtos - Link the functions together between the two modules, 608c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// without doing function bodies... this just adds external function prototypes 609c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// to the Dest function... 6105c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 61179df7c0aaa18129e55968c8783ef8346807bd4afChris Lattnerstatic bool LinkFunctionProtos(Module *Dest, const Module *Src, 6125c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 6135c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 614b91b657e026e86082b665cc875c2881ed075b68dChris Lattner SymbolTable *ST = (SymbolTable*)&Dest->getSymbolTable(); 6155c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 616c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Loop over all of the functions in the src module, mapping them over as we 617c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // go 6185c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 6195c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner for (Module::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) { 62018961504fc2b299578dba817900a0696cf3ccc4dChris Lattner const Function *SF = I; // SrcFunction 6214ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner Function *DF = 0; 622fe41069070f1a4b2d58a996b1f82ff747d076435Chris Lattner if (SF->hasName() && !SF->hasInternalLinkage()) 62379df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner // The same named thing is a Function, because the only two things 62479df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner // that may be in a module level symbol table are Global Vars and 62579df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner // Functions, and they both have distinct, nonoverlapping, possible types. 6265c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 627fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner DF = cast_or_null<Function>(FindGlobalNamed(SF->getName(), SF->getType(), 628fcd0234de65fc07fb06f3245b60e82bdba78c745Chris Lattner ST)); 6295c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 6304ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner if (!DF || SF->hasInternalLinkage() || DF->hasInternalLinkage()) { 6310fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner // Function does not already exist, simply insert an function signature 6320fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner // identical to SF into the dest module... 6332719bac90525985f4ebb97324b4c087d47b54384Chris Lattner Function *NewDF = new Function(SF->getFunctionType(), SF->getLinkage(), 6342719bac90525985f4ebb97324b4c087d47b54384Chris Lattner SF->getName(), Dest); 6352719bac90525985f4ebb97324b4c087d47b54384Chris Lattner 6362719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // If the LLVM runtime renamed the function, but it is an externally 6372719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // visible symbol, DF must be an existing function with internal linkage. 6382719bac90525985f4ebb97324b4c087d47b54384Chris Lattner // Rename it. 639c003628a612d3687fb77088a5894314210a65385Chris Lattner if (NewDF->getName() != SF->getName() && !NewDF->hasInternalLinkage()) 640c003628a612d3687fb77088a5894314210a65385Chris Lattner ForceRenaming(DF, SF->getName()); 6414ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner 6424ad02e726d9b634372b037d4b352d8b63bb9e849Chris Lattner // ... and remember this mapping... 6432719bac90525985f4ebb97324b4c087d47b54384Chris Lattner ValueMap.insert(std::make_pair(SF, NewDF)); 644c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SF->isExternal()) { 645c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // If SF is external or if both SF & DF are external.. Just link the 646c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // external functions, we aren't adding anything. 647c2b97d43a074445c6856d69538a95de09450c26eChris Lattner ValueMap.insert(std::make_pair(SF, DF)); 648c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (DF->isExternal()) { // If DF is external but SF is not... 649c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // Link the external functions, update linkage qualifiers 650c2b97d43a074445c6856d69538a95de09450c26eChris Lattner ValueMap.insert(std::make_pair(SF, DF)); 651c2b97d43a074445c6856d69538a95de09450c26eChris Lattner DF->setLinkage(SF->getLinkage()); 652c2b97d43a074445c6856d69538a95de09450c26eChris Lattner 65335956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner } else if (SF->hasWeakLinkage() || SF->hasLinkOnceLinkage()) { 65472ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner // At this point we know that DF has LinkOnce, Weak, or External linkage. 65572ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner ValueMap.insert(std::make_pair(SF, DF)); 65672ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner 65735956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner // Linkonce+Weak = Weak 65835956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner if (DF->hasLinkOnceLinkage() && SF->hasWeakLinkage()) 65935956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner DF->setLinkage(SF->getLinkage()); 66035956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner 66135956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner } else if (DF->hasWeakLinkage() || DF->hasLinkOnceLinkage()) { 66272ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner // At this point we know that SF has LinkOnce or External linkage. 66372ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner ValueMap.insert(std::make_pair(SF, DF)); 66472ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner if (!SF->hasLinkOnceLinkage()) // Don't inherit linkonce linkage 66572ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner DF->setLinkage(SF->getLinkage()); 66672ac148d4964fbff950fe11a0eeeda73973b849bChris Lattner 667c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SF->getLinkage() != DF->getLinkage()) { 6680fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner return Error(Err, "Functions named '" + SF->getName() + 6690fec08eb58dd9fffeb72c584aa61a59d71111c8dChris Lattner "' have different linkage specifiers!"); 670c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else if (SF->hasExternalLinkage()) { 671c2b97d43a074445c6856d69538a95de09450c26eChris Lattner // The function is defined in both modules!! 672c2b97d43a074445c6856d69538a95de09450c26eChris Lattner return Error(Err, "Function '" + 673c2b97d43a074445c6856d69538a95de09450c26eChris Lattner SF->getFunctionType()->getDescription() + "':\"" + 674c2b97d43a074445c6856d69538a95de09450c26eChris Lattner SF->getName() + "\" - Function is already defined!"); 675c2b97d43a074445c6856d69538a95de09450c26eChris Lattner } else { 676c2b97d43a074445c6856d69538a95de09450c26eChris Lattner assert(0 && "Unknown linkage configuration found!"); 6775c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 6785c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 6795c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 6805c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 6815c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 682c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBody - Copy the source function over into the dest function and 683c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// fix up references to values. At this point we know that Dest is an external 684c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function, and that Src is not. 6855c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 68679df7c0aaa18129e55968c8783ef8346807bd4afChris Lattnerstatic bool LinkFunctionBody(Function *Dest, const Function *Src, 6875c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &GlobalMap, 6885c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 6895c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner assert(Src && Dest && Dest->isExternal() && !Src->isExternal()); 6905c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> LocalMap; // Map for function local values 6915c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 692c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Go through and convert function arguments over... 69369da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner Function::aiterator DI = Dest->abegin(); 69418961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Function::const_aiterator I = Src->abegin(), E = Src->aend(); 69569da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner I != E; ++I, ++DI) { 69669da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner DI->setName(I->getName()); // Copy the name information over... 6975c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 6985c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Add a mapping to our local map 69969da5cf26143e4542d4bf8c78ffac6d079efe5c9Chris Lattner LocalMap.insert(std::make_pair(I, DI)); 7005c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 7015c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 7025c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Loop over all of the basic blocks, copying the instructions over... 7035c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 70479df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner for (Function::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) { 705c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Create new basic block and add to mapping and the Dest function... 70618961504fc2b299578dba817900a0696cf3ccc4dChris Lattner BasicBlock *DBB = new BasicBlock(I->getName(), Dest); 70718961504fc2b299578dba817900a0696cf3ccc4dChris Lattner LocalMap.insert(std::make_pair(I, DBB)); 7085c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 7095c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // Loop over all of the instructions in the src basic block, copying them 7105c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // over. Note that this is broken in a strict sense because the cloned 7115c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // instructions will still be referencing values in the Src module, not 7125c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // the remapped values. In our case, however, we will not get caught and 7135c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // so we can delay patching the values up until later... 7145c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 71518961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (BasicBlock::const_iterator II = I->begin(), IE = I->end(); 7165c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner II != IE; ++II) { 71718961504fc2b299578dba817900a0696cf3ccc4dChris Lattner Instruction *DI = II->clone(); 71818961504fc2b299578dba817900a0696cf3ccc4dChris Lattner DI->setName(II->getName()); 7195c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner DBB->getInstList().push_back(DI); 72018961504fc2b299578dba817900a0696cf3ccc4dChris Lattner LocalMap.insert(std::make_pair(II, DI)); 7215c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 7225c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 7235c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 724c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // At this point, all of the instructions and values of the function are now 725c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // copied over. The only problem is that they are still referencing values in 726c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // the Source function as operands. Loop through all of the operands of the 727c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // functions and patch them up to point to the local versions... 7285c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 72918961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Function::iterator BB = Dest->begin(), BE = Dest->end(); BB != BE; ++BB) 73018961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) 73118961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Instruction::op_iterator OI = I->op_begin(), OE = I->op_end(); 732221d688a5ef21a22c2368c9fff0e92d7966c95e5Chris Lattner OI != OE; ++OI) 733221d688a5ef21a22c2368c9fff0e92d7966c95e5Chris Lattner *OI = RemapOperand(*OI, LocalMap, &GlobalMap); 7345c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 7355c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 7365c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 7375c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 7385c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 739c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// LinkFunctionBodies - Link in the function bodies that are defined in the 740c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// source module into the DestModule. This consists basically of copying the 741c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner// function over and fixing up references to values. 7425c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// 74379df7c0aaa18129e55968c8783ef8346807bd4afChris Lattnerstatic bool LinkFunctionBodies(Module *Dest, const Module *Src, 7445c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> &ValueMap, 7455c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::string *Err) { 7465c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 747c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Loop over all of the functions in the src module, mapping them over as we 748c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // go 7495c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 75018961504fc2b299578dba817900a0696cf3ccc4dChris Lattner for (Module::const_iterator SF = Src->begin(), E = Src->end(); SF != E; ++SF){ 75118961504fc2b299578dba817900a0696cf3ccc4dChris Lattner if (!SF->isExternal()) { // No body if function is external 75218961504fc2b299578dba817900a0696cf3ccc4dChris Lattner Function *DF = cast<Function>(ValueMap[SF]); // Destination function 753c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner 75418961504fc2b299578dba817900a0696cf3ccc4dChris Lattner // DF not external SF external? 75535956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner if (DF->isExternal()) { 75635956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner // Only provide the function body if there isn't one already. 75735956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner if (LinkFunctionBody(DF, SF, ValueMap, Err)) 75835956558e26e655aaa2e8ad6ee405365271869a4Chris Lattner return true; 759c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner } 760c2d774b6c1d38421c435b6d3cfaa10402c900aebChris Lattner } 7615c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner } 7625c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner return false; 7635c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner} 7645c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 7658166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// LinkAppendingVars - If there were any appending global variables, link them 7668166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// together now. Return true on error. 7678166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner// 7688166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattnerstatic bool LinkAppendingVars(Module *M, 7698166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> &AppendingVars, 7708166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::string *ErrorMsg) { 7718166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (AppendingVars.empty()) return false; // Nothing to do. 7728166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 7738166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Loop over the multimap of appending vars, processing any variables with the 7748166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // same name, forming a new appending global variable with both of the 7758166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers merged together, then rewrite references to the old variables 7768166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // and delete them. 7778166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // 7788166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::vector<Constant*> Inits; 7798166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner while (AppendingVars.size() > 1) { 7808166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Get the first two elements in the map... 7818166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, 7828166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable*>::iterator Second = AppendingVars.begin(), First=Second++; 7838166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 7848166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If the first two elements are for different names, there is no pair... 7858166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Otherwise there is a pair, so link them together... 7868166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (First->first == Second->first) { 7878166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *G1 = First->second, *G2 = Second->second; 7888166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T1 = cast<ArrayType>(G1->getType()->getElementType()); 7898166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner const ArrayType *T2 = cast<ArrayType>(G2->getType()->getElementType()); 7908166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 7918166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Check to see that they two arrays agree on type... 7928166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (T1->getElementType() != T2->getElementType()) 7938166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 7948166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables with different element types need to be linked!"); 7958166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (G1->isConstant() != G2->isConstant()) 7968166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return Error(ErrorMsg, 7978166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner "Appending variables linked with different const'ness!"); 7988166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 7998166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner unsigned NewSize = T1->getNumElements() + T2->getNumElements(); 8008166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner ArrayType *NewType = ArrayType::get(T1->getElementType(), NewSize); 8018166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8028166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Create the new global variable... 8038166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner GlobalVariable *NG = 8048166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner new GlobalVariable(NewType, G1->isConstant(), G1->getLinkage(), 8058166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner /*init*/0, First->first, M); 8068166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8078166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Merge the initializer... 8088166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.reserve(NewSize); 809de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if (ConstantArray *I = dyn_cast<ConstantArray>(G1->getInitializer())) { 810de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i) 811de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(cast<Constant>(I->getValues()[i])); 812de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } else { 813de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner assert(isa<ConstantAggregateZero>(G1->getInitializer())); 814de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Constant *CV = Constant::getNullValue(T1->getElementType()); 815de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i) 816de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(CV); 817de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } 818de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner if (ConstantArray *I = dyn_cast<ConstantArray>(G2->getInitializer())) { 819de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i) 820de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(cast<Constant>(I->getValues()[i])); 821de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } else { 822de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner assert(isa<ConstantAggregateZero>(G2->getInitializer())); 823de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Constant *CV = Constant::getNullValue(T2->getElementType()); 824de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i) 825de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner Inits.push_back(CV); 826de512b5b2edebe9c9021a92c7c7a9ae9fbc380d6Chris Lattner } 8278166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner NG->setInitializer(ConstantArray::get(NewType, Inits)); 8288166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Inits.clear(); 8298166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8308166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Replace any uses of the two global variables with uses of the new 8318166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // global... 8328166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8338166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // FIXME: This should rewrite simple/straight-forward uses such as 8348166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // getelementptr instructions to not use the Cast! 83500dc4796132933e76fe2b834ca087e42621c175aReid Spencer G1->replaceAllUsesWith(ConstantExpr::getCast(NG, G1->getType())); 83600dc4796132933e76fe2b834ca087e42621c175aReid Spencer G2->replaceAllUsesWith(ConstantExpr::getCast(NG, G2->getType())); 8378166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8388166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Remove the two globals from the module now... 8398166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G1); 8408166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner M->getGlobalList().erase(G2); 8418166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8428166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Put the new global into the AppendingVars map so that we can handle 8438166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // linking of more than two vars... 8448166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner Second->second = NG; 8458166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 8468166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner AppendingVars.erase(First); 8478166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner } 8488166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8498166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner return false; 8508166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner} 85152f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 85252f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 85352f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// LinkModules - This function links two modules together, with the resulting 85452f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// left module modified to be the composite of the two input modules. If an 85552f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// error occurs, true is returned and ErrorMsg (if not null) is set to indicate 8565c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// the problem. Upon failure, the Dest module could be in a modified state, and 8575c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner// shouldn't be relied on to be consistent. 85852f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner// 859f7703df4968084c18c248c1feea9961c19a32e6aChris Lattnerbool llvm::LinkModules(Module *Dest, const Module *Src, std::string *ErrorMsg) { 860873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner if (Dest->getEndianness() == Module::AnyEndianness) 861873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner Dest->setEndianness(Src->getEndianness()); 862873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner if (Dest->getPointerSize() == Module::AnyPointerSize) 863873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner Dest->setPointerSize(Src->getPointerSize()); 864873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner 865873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner if (Src->getEndianness() != Module::AnyEndianness && 866873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner Dest->getEndianness() != Src->getEndianness()) 86743a9994c0164848d44527060da72985c75183a48Chris Lattner std::cerr << "WARNING: Linking two modules of different endianness!\n"; 868873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner if (Src->getPointerSize() != Module::AnyPointerSize && 869873c5e7859c1534bf92c9e2747f2b70685059598Chris Lattner Dest->getPointerSize() != Src->getPointerSize()) 87043a9994c0164848d44527060da72985c75183a48Chris Lattner std::cerr << "WARNING: Linking two modules of different pointer size!\n"; 8712c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 8722c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // LinkTypes - Go through the symbol table of the Src module and see if any 8732c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // types are named in the src module that are not named in the Dst module. 8742c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // Make sure there are no type name conflicts. 8752c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner // 8762c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner if (LinkTypes(Dest, Src, ErrorMsg)) return true; 8772c236f3e20a0fb84b5948efa6bb7bb60d759cb32Chris Lattner 8785c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // ValueMap - Mapping of values from what they used to be in Src, to what they 8795c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // are now in Dest. 8805c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 8815c2d335d86579941b71816196a95a64b277e8963Chris Lattner std::map<const Value*, Value*> ValueMap; 8825c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 8838166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars - Keep track of global variables in the destination module 8848166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // with appending linkage. After the module is linked together, they are 8858166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // appended and the module is rewritten. 8868166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // 8878166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner std::multimap<std::string, GlobalVariable *> AppendingVars; 8888166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8898166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Add all of the appending globals already in the Dest module to 8908166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // AppendingVars. 8918166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner for (Module::giterator I = Dest->gbegin(), E = Dest->gend(); I != E; ++I) 892f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner if (I->hasAppendingLinkage()) 893f41464618f41b92cf0a0bd14ccc57bce727fb33dChris Lattner AppendingVars.insert(std::make_pair(I->getName(), I)); 8948166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 8958166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // Insert all of the globals in src into the Dest module... without linking 8968166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // initializers (which could refer to functions not yet mapped over). 8978166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // 8988166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (LinkGlobals(Dest, Src, ValueMap, AppendingVars, ErrorMsg)) return true; 8995c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 900c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link the functions together between the two modules, without doing function 901c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // bodies... this just adds external function prototypes to the Dest 902c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // function... We do this so that when we begin processing function bodies, 903c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // all of the global values that may be referenced are available in our 904c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // ValueMap. 9055c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 90679df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner if (LinkFunctionProtos(Dest, Src, ValueMap, ErrorMsg)) return true; 9075c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner 9086cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // Update the initializers in the Dest module now that all globals that may 9096cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // be referenced are in Dest. 9106cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner // 9116cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner if (LinkGlobalInits(Dest, Src, ValueMap, ErrorMsg)) return true; 9126cdf1971bdf88ddd9a7d46b5f5f975497d68c38eChris Lattner 913c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // Link in the function bodies that are defined in the source module into the 914c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // DestModule. This consists basically of copying the function over and 915c8cc4cb03bd90f89be7fe1649542a2d5ae689632Chris Lattner // fixing up references to values. 9165c377c524a6929cdaa683f3f034b3fc01526b264Chris Lattner // 91779df7c0aaa18129e55968c8783ef8346807bd4afChris Lattner if (LinkFunctionBodies(Dest, Src, ValueMap, ErrorMsg)) return true; 91852f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner 9198166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // If there were any appending global variables, link them together now. 9208166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner // 9218166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner if (LinkAppendingVars(Dest, AppendingVars, ErrorMsg)) return true; 9228166e6eef6518da6f1f805e0d5e2bb22c15dd49cChris Lattner 92352f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner return false; 92452f7e908cb634f9b9b539d5c6670b8a065478915Chris Lattner} 9259466f5113ba859677a28887c3c7143065e702019Vikram S. Adve 926567bc2cc1ed4d610daceecbb4ff7f92ebde1b530Reid Spencer// vim: sw=2 927