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nonunifiable types but the same name. Down with PR411! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15511 91177308-0d34-0410-b5e6-96231b3b80d8
915 lines
38 KiB
C++
915 lines
38 KiB
C++
//===- Linker.cpp - Module Linker Implementation --------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the LLVM module linker.
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//
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// Specifically, this:
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// * Merges global variables between the two modules
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// * Uninit + Uninit = Init, Init + Uninit = Init, Init + Init = Error if !=
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// * Merges functions between two modules
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/Linker.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Module.h"
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#include "llvm/SymbolTable.h"
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#include "llvm/Instructions.h"
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#include "llvm/Assembly/Writer.h"
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#include <iostream>
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using namespace llvm;
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// Error - Simple wrapper function to conditionally assign to E and return true.
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// This just makes error return conditions a little bit simpler...
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//
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static inline bool Error(std::string *E, const std::string &Message) {
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if (E) *E = Message;
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return true;
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}
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//
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// Function: ResolveTypes()
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//
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// Description:
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// Attempt to link the two specified types together.
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//
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// Inputs:
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// DestTy - The type to which we wish to resolve.
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// SrcTy - The original type which we want to resolve.
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// Name - The name of the type.
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//
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// Outputs:
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// DestST - The symbol table in which the new type should be placed.
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//
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// Return value:
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// true - There is an error and the types cannot yet be linked.
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// false - No errors.
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//
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static bool ResolveTypes(const Type *DestTy, const Type *SrcTy,
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SymbolTable *DestST, const std::string &Name) {
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if (DestTy == SrcTy) return false; // If already equal, noop
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// Does the type already exist in the module?
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if (DestTy && !isa<OpaqueType>(DestTy)) { // Yup, the type already exists...
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if (const OpaqueType *OT = dyn_cast<OpaqueType>(SrcTy)) {
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const_cast<OpaqueType*>(OT)->refineAbstractTypeTo(DestTy);
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} else {
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return true; // Cannot link types... neither is opaque and not-equal
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}
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} else { // Type not in dest module. Add it now.
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if (DestTy) // Type _is_ in module, just opaque...
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const_cast<OpaqueType*>(cast<OpaqueType>(DestTy))
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->refineAbstractTypeTo(SrcTy);
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else if (!Name.empty())
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DestST->insert(Name, const_cast<Type*>(SrcTy));
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}
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return false;
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}
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static const FunctionType *getFT(const PATypeHolder &TH) {
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return cast<FunctionType>(TH.get());
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}
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static const StructType *getST(const PATypeHolder &TH) {
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return cast<StructType>(TH.get());
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}
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// RecursiveResolveTypes - This is just like ResolveTypes, except that it
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// recurses down into derived types, merging the used types if the parent types
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// are compatible.
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//
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static bool RecursiveResolveTypesI(const PATypeHolder &DestTy,
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const PATypeHolder &SrcTy,
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SymbolTable *DestST, const std::string &Name,
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std::vector<std::pair<PATypeHolder, PATypeHolder> > &Pointers) {
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const Type *SrcTyT = SrcTy.get();
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const Type *DestTyT = DestTy.get();
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if (DestTyT == SrcTyT) return false; // If already equal, noop
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// If we found our opaque type, resolve it now!
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if (isa<OpaqueType>(DestTyT) || isa<OpaqueType>(SrcTyT))
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return ResolveTypes(DestTyT, SrcTyT, DestST, Name);
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// Two types cannot be resolved together if they are of different primitive
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// type. For example, we cannot resolve an int to a float.
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if (DestTyT->getTypeID() != SrcTyT->getTypeID()) return true;
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// Otherwise, resolve the used type used by this derived type...
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switch (DestTyT->getTypeID()) {
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case Type::FunctionTyID: {
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if (cast<FunctionType>(DestTyT)->isVarArg() !=
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cast<FunctionType>(SrcTyT)->isVarArg() ||
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cast<FunctionType>(DestTyT)->getNumContainedTypes() !=
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cast<FunctionType>(SrcTyT)->getNumContainedTypes())
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return true;
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for (unsigned i = 0, e = getFT(DestTy)->getNumContainedTypes(); i != e; ++i)
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if (RecursiveResolveTypesI(getFT(DestTy)->getContainedType(i),
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getFT(SrcTy)->getContainedType(i), DestST, "",
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Pointers))
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return true;
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return false;
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}
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case Type::StructTyID: {
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if (getST(DestTy)->getNumContainedTypes() !=
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getST(SrcTy)->getNumContainedTypes()) return 1;
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for (unsigned i = 0, e = getST(DestTy)->getNumContainedTypes(); i != e; ++i)
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if (RecursiveResolveTypesI(getST(DestTy)->getContainedType(i),
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getST(SrcTy)->getContainedType(i), DestST, "",
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Pointers))
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return true;
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return false;
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}
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case Type::ArrayTyID: {
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const ArrayType *DAT = cast<ArrayType>(DestTy.get());
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const ArrayType *SAT = cast<ArrayType>(SrcTy.get());
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if (DAT->getNumElements() != SAT->getNumElements()) return true;
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return RecursiveResolveTypesI(DAT->getElementType(), SAT->getElementType(),
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DestST, "", Pointers);
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}
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case Type::PointerTyID: {
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// If this is a pointer type, check to see if we have already seen it. If
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// so, we are in a recursive branch. Cut off the search now. We cannot use
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// an associative container for this search, because the type pointers (keys
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// in the container) change whenever types get resolved...
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//
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for (unsigned i = 0, e = Pointers.size(); i != e; ++i)
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if (Pointers[i].first == DestTy)
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return Pointers[i].second != SrcTy;
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// Otherwise, add the current pointers to the vector to stop recursion on
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// this pair.
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Pointers.push_back(std::make_pair(DestTyT, SrcTyT));
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bool Result =
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RecursiveResolveTypesI(cast<PointerType>(DestTy.get())->getElementType(),
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cast<PointerType>(SrcTy.get())->getElementType(),
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DestST, "", Pointers);
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Pointers.pop_back();
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return Result;
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}
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default: assert(0 && "Unexpected type!"); return true;
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}
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}
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static bool RecursiveResolveTypes(const PATypeHolder &DestTy,
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const PATypeHolder &SrcTy,
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SymbolTable *DestST, const std::string &Name){
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std::vector<std::pair<PATypeHolder, PATypeHolder> > PointerTypes;
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return RecursiveResolveTypesI(DestTy, SrcTy, DestST, Name, PointerTypes);
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}
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// LinkTypes - Go through the symbol table of the Src module and see if any
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// types are named in the src module that are not named in the Dst module.
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// Make sure there are no type name conflicts.
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//
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static bool LinkTypes(Module *Dest, const Module *Src, std::string *Err) {
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SymbolTable *DestST = &Dest->getSymbolTable();
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const SymbolTable *SrcST = &Src->getSymbolTable();
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// Look for a type plane for Type's...
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SymbolTable::type_const_iterator TI = SrcST->type_begin();
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SymbolTable::type_const_iterator TE = SrcST->type_end();
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if (TI == TE) return false; // No named types, do nothing.
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// Some types cannot be resolved immediately because they depend on other
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// types being resolved to each other first. This contains a list of types we
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// are waiting to recheck.
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std::vector<std::string> DelayedTypesToResolve;
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for ( ; TI != TE; ++TI ) {
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const std::string &Name = TI->first;
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const Type *RHS = TI->second;
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// Check to see if this type name is already in the dest module...
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Type *Entry = DestST->lookupType(Name);
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if (ResolveTypes(Entry, RHS, DestST, Name)) {
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// They look different, save the types 'till later to resolve.
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DelayedTypesToResolve.push_back(Name);
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}
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}
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// Iteratively resolve types while we can...
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while (!DelayedTypesToResolve.empty()) {
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// Loop over all of the types, attempting to resolve them if possible...
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unsigned OldSize = DelayedTypesToResolve.size();
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// Try direct resolution by name...
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for (unsigned i = 0; i != DelayedTypesToResolve.size(); ++i) {
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const std::string &Name = DelayedTypesToResolve[i];
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Type *T1 = SrcST->lookupType(Name);
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Type *T2 = DestST->lookupType(Name);
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if (!ResolveTypes(T2, T1, DestST, Name)) {
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// We are making progress!
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DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i);
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--i;
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}
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}
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// Did we not eliminate any types?
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if (DelayedTypesToResolve.size() == OldSize) {
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// Attempt to resolve subelements of types. This allows us to merge these
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// two types: { int* } and { opaque* }
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for (unsigned i = 0, e = DelayedTypesToResolve.size(); i != e; ++i) {
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const std::string &Name = DelayedTypesToResolve[i];
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PATypeHolder T1(SrcST->lookupType(Name));
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PATypeHolder T2(DestST->lookupType(Name));
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if (!RecursiveResolveTypes(T2, T1, DestST, Name)) {
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// We are making progress!
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DelayedTypesToResolve.erase(DelayedTypesToResolve.begin()+i);
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// Go back to the main loop, perhaps we can resolve directly by name
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// now...
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break;
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}
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}
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// If we STILL cannot resolve the types, then there is something wrong.
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// Report the warning and delete one of the names.
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if (DelayedTypesToResolve.size() == OldSize) {
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const std::string &Name = DelayedTypesToResolve.back();
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const Type *T1 = SrcST->lookupType(Name);
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const Type *T2 = DestST->lookupType(Name);
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std::cerr << "WARNING: Type conflict between types named '" << Name
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<< "'.\n Src='";
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WriteTypeSymbolic(std::cerr, T1, Src);
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std::cerr << "'.\n Dest='";
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WriteTypeSymbolic(std::cerr, T2, Dest);
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std::cerr << "'\n";
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// Remove the symbol name from the destination.
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DelayedTypesToResolve.pop_back();
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}
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}
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}
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return false;
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}
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static void PrintMap(const std::map<const Value*, Value*> &M) {
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for (std::map<const Value*, Value*>::const_iterator I = M.begin(), E =M.end();
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I != E; ++I) {
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std::cerr << " Fr: " << (void*)I->first << " ";
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I->first->dump();
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std::cerr << " To: " << (void*)I->second << " ";
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I->second->dump();
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std::cerr << "\n";
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}
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}
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// RemapOperand - Use LocalMap and GlobalMap to convert references from one
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// module to another. This is somewhat sophisticated in that it can
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// automatically handle constant references correctly as well...
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//
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static Value *RemapOperand(const Value *In,
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std::map<const Value*, Value*> &LocalMap,
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std::map<const Value*, Value*> *GlobalMap) {
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std::map<const Value*,Value*>::const_iterator I = LocalMap.find(In);
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if (I != LocalMap.end()) return I->second;
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if (GlobalMap) {
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I = GlobalMap->find(In);
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if (I != GlobalMap->end()) return I->second;
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}
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// Check to see if it's a constant that we are interesting in transforming...
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if (const Constant *CPV = dyn_cast<Constant>(In)) {
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if ((!isa<DerivedType>(CPV->getType()) && !isa<ConstantExpr>(CPV)) ||
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isa<ConstantAggregateZero>(CPV))
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return const_cast<Constant*>(CPV); // Simple constants stay identical...
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Constant *Result = 0;
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if (const ConstantArray *CPA = dyn_cast<ConstantArray>(CPV)) {
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std::vector<Constant*> Operands(CPA->getNumOperands());
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for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
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Operands[i] =
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cast<Constant>(RemapOperand(CPA->getOperand(i), LocalMap, GlobalMap));
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Result = ConstantArray::get(cast<ArrayType>(CPA->getType()), Operands);
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} else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(CPV)) {
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std::vector<Constant*> Operands(CPS->getNumOperands());
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for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
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Operands[i] =
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cast<Constant>(RemapOperand(CPS->getOperand(i), LocalMap, GlobalMap));
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Result = ConstantStruct::get(cast<StructType>(CPS->getType()), Operands);
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} else if (isa<ConstantPointerNull>(CPV)) {
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Result = const_cast<Constant*>(CPV);
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} else if (isa<GlobalValue>(CPV)) {
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Result = cast<Constant>(RemapOperand(CPV, LocalMap, GlobalMap));
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} else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
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if (CE->getOpcode() == Instruction::GetElementPtr) {
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Value *Ptr = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap);
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std::vector<Constant*> Indices;
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Indices.reserve(CE->getNumOperands()-1);
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for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i)
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Indices.push_back(cast<Constant>(RemapOperand(CE->getOperand(i),
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LocalMap, GlobalMap)));
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Result = ConstantExpr::getGetElementPtr(cast<Constant>(Ptr), Indices);
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} else if (CE->getNumOperands() == 1) {
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// Cast instruction
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assert(CE->getOpcode() == Instruction::Cast);
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Value *V = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap);
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Result = ConstantExpr::getCast(cast<Constant>(V), CE->getType());
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} else if (CE->getNumOperands() == 3) {
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// Select instruction
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assert(CE->getOpcode() == Instruction::Select);
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Value *V1 = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap);
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Value *V2 = RemapOperand(CE->getOperand(1), LocalMap, GlobalMap);
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Value *V3 = RemapOperand(CE->getOperand(2), LocalMap, GlobalMap);
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Result = ConstantExpr::getSelect(cast<Constant>(V1), cast<Constant>(V2),
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cast<Constant>(V3));
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} else if (CE->getNumOperands() == 2) {
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// Binary operator...
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Value *V1 = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap);
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Value *V2 = RemapOperand(CE->getOperand(1), LocalMap, GlobalMap);
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Result = ConstantExpr::get(CE->getOpcode(), cast<Constant>(V1),
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cast<Constant>(V2));
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} else {
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assert(0 && "Unknown constant expr type!");
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}
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} else {
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assert(0 && "Unknown type of derived type constant value!");
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}
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// Cache the mapping in our local map structure...
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if (GlobalMap)
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GlobalMap->insert(std::make_pair(In, Result));
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else
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LocalMap.insert(std::make_pair(In, Result));
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return Result;
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}
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std::cerr << "XXX LocalMap: \n";
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PrintMap(LocalMap);
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if (GlobalMap) {
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std::cerr << "XXX GlobalMap: \n";
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PrintMap(*GlobalMap);
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}
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std::cerr << "Couldn't remap value: " << (void*)In << " " << *In << "\n";
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assert(0 && "Couldn't remap value!");
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return 0;
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}
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/// ForceRenaming - The LLVM SymbolTable class autorenames globals that conflict
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/// in the symbol table. This is good for all clients except for us. Go
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/// through the trouble to force this back.
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static void ForceRenaming(GlobalValue *GV, const std::string &Name) {
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assert(GV->getName() != Name && "Can't force rename to self");
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SymbolTable &ST = GV->getParent()->getSymbolTable();
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// If there is a conflict, rename the conflict.
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Value *ConflictVal = ST.lookup(GV->getType(), Name);
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assert(ConflictVal&&"Why do we have to force rename if there is no conflic?");
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GlobalValue *ConflictGV = cast<GlobalValue>(ConflictVal);
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assert(ConflictGV->hasInternalLinkage() &&
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"Not conflicting with a static global, should link instead!");
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ConflictGV->setName(""); // Eliminate the conflict
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GV->setName(Name); // Force the name back
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ConflictGV->setName(Name); // This will cause ConflictGV to get renamed
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assert(GV->getName() == Name && ConflictGV->getName() != Name &&
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"ForceRenaming didn't work");
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}
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// LinkGlobals - Loop through the global variables in the src module and merge
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// them into the dest module.
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//
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static bool LinkGlobals(Module *Dest, const Module *Src,
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std::map<const Value*, Value*> &ValueMap,
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std::multimap<std::string, GlobalVariable *> &AppendingVars,
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std::map<std::string, GlobalValue*> &GlobalsByName,
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std::string *Err) {
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// We will need a module level symbol table if the src module has a module
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// level symbol table...
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SymbolTable *ST = (SymbolTable*)&Dest->getSymbolTable();
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// Loop over all of the globals in the src module, mapping them over as we go
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//
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for (Module::const_giterator I = Src->gbegin(), E = Src->gend(); I != E; ++I){
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const GlobalVariable *SGV = I;
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GlobalVariable *DGV = 0;
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// Check to see if may have to link the global.
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if (SGV->hasName() && !SGV->hasInternalLinkage())
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if (!(DGV = Dest->getGlobalVariable(SGV->getName(),
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SGV->getType()->getElementType()))) {
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std::map<std::string, GlobalValue*>::iterator EGV =
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GlobalsByName.find(SGV->getName());
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if (EGV != GlobalsByName.end())
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DGV = dyn_cast<GlobalVariable>(EGV->second);
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if (DGV && RecursiveResolveTypes(SGV->getType(), DGV->getType(), ST, ""))
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DGV = 0; // FIXME: gross.
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}
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assert(SGV->hasInitializer() || SGV->hasExternalLinkage() &&
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"Global must either be external or have an initializer!");
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bool SGExtern = SGV->isExternal();
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bool DGExtern = DGV ? DGV->isExternal() : false;
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if (!DGV || DGV->hasInternalLinkage() || SGV->hasInternalLinkage()) {
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// No linking to be performed, simply create an identical version of the
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// symbol over in the dest module... the initializer will be filled in
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// later by LinkGlobalInits...
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//
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GlobalVariable *NewDGV =
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new GlobalVariable(SGV->getType()->getElementType(),
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SGV->isConstant(), SGV->getLinkage(), /*init*/0,
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SGV->getName(), Dest);
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// If the LLVM runtime renamed the global, but it is an externally visible
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// symbol, DGV must be an existing global with internal linkage. Rename
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// it.
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if (NewDGV->getName() != SGV->getName() && !NewDGV->hasInternalLinkage())
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ForceRenaming(NewDGV, SGV->getName());
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// Make sure to remember this mapping...
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ValueMap.insert(std::make_pair(SGV, NewDGV));
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if (SGV->hasAppendingLinkage())
|
|
// Keep track that this is an appending variable...
|
|
AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV));
|
|
|
|
} else if (SGV->isExternal()) {
|
|
// If SGV is external or if both SGV & DGV are external.. Just link the
|
|
// external globals, we aren't adding anything.
|
|
ValueMap.insert(std::make_pair(SGV, DGV));
|
|
|
|
} else if (DGV->isExternal()) { // If DGV is external but SGV is not...
|
|
ValueMap.insert(std::make_pair(SGV, DGV));
|
|
DGV->setLinkage(SGV->getLinkage()); // Inherit linkage!
|
|
} else if (SGV->hasWeakLinkage() || SGV->hasLinkOnceLinkage()) {
|
|
// At this point we know that DGV has LinkOnce, Appending, Weak, or
|
|
// External linkage. If DGV is Appending, this is an error.
|
|
if (DGV->hasAppendingLinkage())
|
|
return Error(Err, "Linking globals named '" + SGV->getName() +
|
|
" ' with 'weak' and 'appending' linkage is not allowed!");
|
|
|
|
if (SGV->isConstant() != DGV->isConstant())
|
|
return Error(Err, "Global Variable Collision on '" +
|
|
SGV->getType()->getDescription() + " %" + SGV->getName() +
|
|
"' - Global variables differ in const'ness");
|
|
|
|
// Otherwise, just perform the link.
|
|
ValueMap.insert(std::make_pair(SGV, DGV));
|
|
|
|
// Linkonce+Weak = Weak
|
|
if (DGV->hasLinkOnceLinkage() && SGV->hasWeakLinkage())
|
|
DGV->setLinkage(SGV->getLinkage());
|
|
|
|
} else if (DGV->hasWeakLinkage() || DGV->hasLinkOnceLinkage()) {
|
|
// At this point we know that SGV has LinkOnce, Appending, or External
|
|
// linkage. If SGV is Appending, this is an error.
|
|
if (SGV->hasAppendingLinkage())
|
|
return Error(Err, "Linking globals named '" + SGV->getName() +
|
|
" ' with 'weak' and 'appending' linkage is not allowed!");
|
|
|
|
if (SGV->isConstant() != DGV->isConstant())
|
|
return Error(Err, "Global Variable Collision on '" +
|
|
SGV->getType()->getDescription() + " %" + SGV->getName() +
|
|
"' - Global variables differ in const'ness");
|
|
|
|
if (!SGV->hasLinkOnceLinkage())
|
|
DGV->setLinkage(SGV->getLinkage()); // Inherit linkage!
|
|
ValueMap.insert(std::make_pair(SGV, DGV));
|
|
|
|
} else if (SGV->getLinkage() != DGV->getLinkage()) {
|
|
return Error(Err, "Global variables named '" + SGV->getName() +
|
|
"' have different linkage specifiers!");
|
|
} else if (SGV->hasExternalLinkage()) {
|
|
// Allow linking two exactly identical external global variables...
|
|
if (SGV->isConstant() != DGV->isConstant())
|
|
return Error(Err, "Global Variable Collision on '" +
|
|
SGV->getType()->getDescription() + " %" + SGV->getName() +
|
|
"' - Global variables differ in const'ness");
|
|
|
|
if (SGV->getInitializer() != DGV->getInitializer())
|
|
return Error(Err, "Global Variable Collision on '" +
|
|
SGV->getType()->getDescription() + " %" + SGV->getName() +
|
|
"' - External linkage globals have different initializers");
|
|
|
|
ValueMap.insert(std::make_pair(SGV, DGV));
|
|
} else if (SGV->hasAppendingLinkage()) {
|
|
// No linking is performed yet. Just insert a new copy of the global, and
|
|
// keep track of the fact that it is an appending variable in the
|
|
// AppendingVars map. The name is cleared out so that no linkage is
|
|
// performed.
|
|
GlobalVariable *NewDGV =
|
|
new GlobalVariable(SGV->getType()->getElementType(),
|
|
SGV->isConstant(), SGV->getLinkage(), /*init*/0,
|
|
"", Dest);
|
|
|
|
// Make sure to remember this mapping...
|
|
ValueMap.insert(std::make_pair(SGV, NewDGV));
|
|
|
|
// Keep track that this is an appending variable...
|
|
AppendingVars.insert(std::make_pair(SGV->getName(), NewDGV));
|
|
} else {
|
|
assert(0 && "Unknown linkage!");
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
// LinkGlobalInits - Update the initializers in the Dest module now that all
|
|
// globals that may be referenced are in Dest.
|
|
//
|
|
static bool LinkGlobalInits(Module *Dest, const Module *Src,
|
|
std::map<const Value*, Value*> &ValueMap,
|
|
std::string *Err) {
|
|
|
|
// Loop over all of the globals in the src module, mapping them over as we go
|
|
//
|
|
for (Module::const_giterator I = Src->gbegin(), E = Src->gend(); I != E; ++I){
|
|
const GlobalVariable *SGV = I;
|
|
|
|
if (SGV->hasInitializer()) { // Only process initialized GV's
|
|
// Figure out what the initializer looks like in the dest module...
|
|
Constant *SInit =
|
|
cast<Constant>(RemapOperand(SGV->getInitializer(), ValueMap, 0));
|
|
|
|
GlobalVariable *DGV = cast<GlobalVariable>(ValueMap[SGV]);
|
|
if (DGV->hasInitializer()) {
|
|
if (SGV->hasExternalLinkage()) {
|
|
if (DGV->getInitializer() != SInit)
|
|
return Error(Err, "Global Variable Collision on '" +
|
|
SGV->getType()->getDescription() +"':%"+SGV->getName()+
|
|
" - Global variables have different initializers");
|
|
} else if (DGV->hasLinkOnceLinkage() || DGV->hasWeakLinkage()) {
|
|
// Nothing is required, mapped values will take the new global
|
|
// automatically.
|
|
} else if (SGV->hasLinkOnceLinkage() || SGV->hasWeakLinkage()) {
|
|
// Nothing is required, mapped values will take the new global
|
|
// automatically.
|
|
} else if (DGV->hasAppendingLinkage()) {
|
|
assert(0 && "Appending linkage unimplemented!");
|
|
} else {
|
|
assert(0 && "Unknown linkage!");
|
|
}
|
|
} else {
|
|
// Copy the initializer over now...
|
|
DGV->setInitializer(SInit);
|
|
}
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// LinkFunctionProtos - Link the functions together between the two modules,
|
|
// without doing function bodies... this just adds external function prototypes
|
|
// to the Dest function...
|
|
//
|
|
static bool LinkFunctionProtos(Module *Dest, const Module *Src,
|
|
std::map<const Value*, Value*> &ValueMap,
|
|
std::map<std::string, GlobalValue*> &GlobalsByName,
|
|
std::string *Err) {
|
|
SymbolTable *ST = (SymbolTable*)&Dest->getSymbolTable();
|
|
|
|
// Loop over all of the functions in the src module, mapping them over as we
|
|
// go
|
|
//
|
|
for (Module::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) {
|
|
const Function *SF = I; // SrcFunction
|
|
Function *DF = 0;
|
|
if (SF->hasName() && !SF->hasInternalLinkage()) {
|
|
// Check to see if may have to link the function.
|
|
if (!(DF = Dest->getFunction(SF->getName(), SF->getFunctionType()))) {
|
|
std::map<std::string, GlobalValue*>::iterator EF =
|
|
GlobalsByName.find(SF->getName());
|
|
if (EF != GlobalsByName.end())
|
|
DF = dyn_cast<Function>(EF->second);
|
|
if (DF && RecursiveResolveTypes(SF->getType(), DF->getType(), ST, ""))
|
|
DF = 0; // FIXME: gross.
|
|
}
|
|
}
|
|
|
|
if (!DF || SF->hasInternalLinkage() || DF->hasInternalLinkage()) {
|
|
// Function does not already exist, simply insert an function signature
|
|
// identical to SF into the dest module...
|
|
Function *NewDF = new Function(SF->getFunctionType(), SF->getLinkage(),
|
|
SF->getName(), Dest);
|
|
|
|
// If the LLVM runtime renamed the function, but it is an externally
|
|
// visible symbol, DF must be an existing function with internal linkage.
|
|
// Rename it.
|
|
if (NewDF->getName() != SF->getName() && !NewDF->hasInternalLinkage())
|
|
ForceRenaming(NewDF, SF->getName());
|
|
|
|
// ... and remember this mapping...
|
|
ValueMap.insert(std::make_pair(SF, NewDF));
|
|
} else if (SF->isExternal()) {
|
|
// If SF is external or if both SF & DF are external.. Just link the
|
|
// external functions, we aren't adding anything.
|
|
ValueMap.insert(std::make_pair(SF, DF));
|
|
} else if (DF->isExternal()) { // If DF is external but SF is not...
|
|
// Link the external functions, update linkage qualifiers
|
|
ValueMap.insert(std::make_pair(SF, DF));
|
|
DF->setLinkage(SF->getLinkage());
|
|
|
|
} else if (SF->hasWeakLinkage() || SF->hasLinkOnceLinkage()) {
|
|
// At this point we know that DF has LinkOnce, Weak, or External linkage.
|
|
ValueMap.insert(std::make_pair(SF, DF));
|
|
|
|
// Linkonce+Weak = Weak
|
|
if (DF->hasLinkOnceLinkage() && SF->hasWeakLinkage())
|
|
DF->setLinkage(SF->getLinkage());
|
|
|
|
} else if (DF->hasWeakLinkage() || DF->hasLinkOnceLinkage()) {
|
|
// At this point we know that SF has LinkOnce or External linkage.
|
|
ValueMap.insert(std::make_pair(SF, DF));
|
|
if (!SF->hasLinkOnceLinkage()) // Don't inherit linkonce linkage
|
|
DF->setLinkage(SF->getLinkage());
|
|
|
|
} else if (SF->getLinkage() != DF->getLinkage()) {
|
|
return Error(Err, "Functions named '" + SF->getName() +
|
|
"' have different linkage specifiers!");
|
|
} else if (SF->hasExternalLinkage()) {
|
|
// The function is defined in both modules!!
|
|
return Error(Err, "Function '" +
|
|
SF->getFunctionType()->getDescription() + "':\"" +
|
|
SF->getName() + "\" - Function is already defined!");
|
|
} else {
|
|
assert(0 && "Unknown linkage configuration found!");
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// LinkFunctionBody - Copy the source function over into the dest function and
|
|
// fix up references to values. At this point we know that Dest is an external
|
|
// function, and that Src is not.
|
|
//
|
|
static bool LinkFunctionBody(Function *Dest, const Function *Src,
|
|
std::map<const Value*, Value*> &GlobalMap,
|
|
std::string *Err) {
|
|
assert(Src && Dest && Dest->isExternal() && !Src->isExternal());
|
|
std::map<const Value*, Value*> LocalMap; // Map for function local values
|
|
|
|
// Go through and convert function arguments over...
|
|
Function::aiterator DI = Dest->abegin();
|
|
for (Function::const_aiterator I = Src->abegin(), E = Src->aend();
|
|
I != E; ++I, ++DI) {
|
|
DI->setName(I->getName()); // Copy the name information over...
|
|
|
|
// Add a mapping to our local map
|
|
LocalMap.insert(std::make_pair(I, DI));
|
|
}
|
|
|
|
// Loop over all of the basic blocks, copying the instructions over...
|
|
//
|
|
for (Function::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) {
|
|
// Create new basic block and add to mapping and the Dest function...
|
|
BasicBlock *DBB = new BasicBlock(I->getName(), Dest);
|
|
LocalMap.insert(std::make_pair(I, DBB));
|
|
|
|
// Loop over all of the instructions in the src basic block, copying them
|
|
// over. Note that this is broken in a strict sense because the cloned
|
|
// instructions will still be referencing values in the Src module, not
|
|
// the remapped values. In our case, however, we will not get caught and
|
|
// so we can delay patching the values up until later...
|
|
//
|
|
for (BasicBlock::const_iterator II = I->begin(), IE = I->end();
|
|
II != IE; ++II) {
|
|
Instruction *DI = II->clone();
|
|
DI->setName(II->getName());
|
|
DBB->getInstList().push_back(DI);
|
|
LocalMap.insert(std::make_pair(II, DI));
|
|
}
|
|
}
|
|
|
|
// At this point, all of the instructions and values of the function are now
|
|
// copied over. The only problem is that they are still referencing values in
|
|
// the Source function as operands. Loop through all of the operands of the
|
|
// functions and patch them up to point to the local versions...
|
|
//
|
|
for (Function::iterator BB = Dest->begin(), BE = Dest->end(); BB != BE; ++BB)
|
|
for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I)
|
|
for (Instruction::op_iterator OI = I->op_begin(), OE = I->op_end();
|
|
OI != OE; ++OI)
|
|
*OI = RemapOperand(*OI, LocalMap, &GlobalMap);
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
// LinkFunctionBodies - Link in the function bodies that are defined in the
|
|
// source module into the DestModule. This consists basically of copying the
|
|
// function over and fixing up references to values.
|
|
//
|
|
static bool LinkFunctionBodies(Module *Dest, const Module *Src,
|
|
std::map<const Value*, Value*> &ValueMap,
|
|
std::string *Err) {
|
|
|
|
// Loop over all of the functions in the src module, mapping them over as we
|
|
// go
|
|
//
|
|
for (Module::const_iterator SF = Src->begin(), E = Src->end(); SF != E; ++SF){
|
|
if (!SF->isExternal()) { // No body if function is external
|
|
Function *DF = cast<Function>(ValueMap[SF]); // Destination function
|
|
|
|
// DF not external SF external?
|
|
if (DF->isExternal()) {
|
|
// Only provide the function body if there isn't one already.
|
|
if (LinkFunctionBody(DF, SF, ValueMap, Err))
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// LinkAppendingVars - If there were any appending global variables, link them
|
|
// together now. Return true on error.
|
|
//
|
|
static bool LinkAppendingVars(Module *M,
|
|
std::multimap<std::string, GlobalVariable *> &AppendingVars,
|
|
std::string *ErrorMsg) {
|
|
if (AppendingVars.empty()) return false; // Nothing to do.
|
|
|
|
// Loop over the multimap of appending vars, processing any variables with the
|
|
// same name, forming a new appending global variable with both of the
|
|
// initializers merged together, then rewrite references to the old variables
|
|
// and delete them.
|
|
//
|
|
std::vector<Constant*> Inits;
|
|
while (AppendingVars.size() > 1) {
|
|
// Get the first two elements in the map...
|
|
std::multimap<std::string,
|
|
GlobalVariable*>::iterator Second = AppendingVars.begin(), First=Second++;
|
|
|
|
// If the first two elements are for different names, there is no pair...
|
|
// Otherwise there is a pair, so link them together...
|
|
if (First->first == Second->first) {
|
|
GlobalVariable *G1 = First->second, *G2 = Second->second;
|
|
const ArrayType *T1 = cast<ArrayType>(G1->getType()->getElementType());
|
|
const ArrayType *T2 = cast<ArrayType>(G2->getType()->getElementType());
|
|
|
|
// Check to see that they two arrays agree on type...
|
|
if (T1->getElementType() != T2->getElementType())
|
|
return Error(ErrorMsg,
|
|
"Appending variables with different element types need to be linked!");
|
|
if (G1->isConstant() != G2->isConstant())
|
|
return Error(ErrorMsg,
|
|
"Appending variables linked with different const'ness!");
|
|
|
|
unsigned NewSize = T1->getNumElements() + T2->getNumElements();
|
|
ArrayType *NewType = ArrayType::get(T1->getElementType(), NewSize);
|
|
|
|
// Create the new global variable...
|
|
GlobalVariable *NG =
|
|
new GlobalVariable(NewType, G1->isConstant(), G1->getLinkage(),
|
|
/*init*/0, First->first, M);
|
|
|
|
// Merge the initializer...
|
|
Inits.reserve(NewSize);
|
|
if (ConstantArray *I = dyn_cast<ConstantArray>(G1->getInitializer())) {
|
|
for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i)
|
|
Inits.push_back(I->getOperand(i));
|
|
} else {
|
|
assert(isa<ConstantAggregateZero>(G1->getInitializer()));
|
|
Constant *CV = Constant::getNullValue(T1->getElementType());
|
|
for (unsigned i = 0, e = T1->getNumElements(); i != e; ++i)
|
|
Inits.push_back(CV);
|
|
}
|
|
if (ConstantArray *I = dyn_cast<ConstantArray>(G2->getInitializer())) {
|
|
for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i)
|
|
Inits.push_back(I->getOperand(i));
|
|
} else {
|
|
assert(isa<ConstantAggregateZero>(G2->getInitializer()));
|
|
Constant *CV = Constant::getNullValue(T2->getElementType());
|
|
for (unsigned i = 0, e = T2->getNumElements(); i != e; ++i)
|
|
Inits.push_back(CV);
|
|
}
|
|
NG->setInitializer(ConstantArray::get(NewType, Inits));
|
|
Inits.clear();
|
|
|
|
// Replace any uses of the two global variables with uses of the new
|
|
// global...
|
|
|
|
// FIXME: This should rewrite simple/straight-forward uses such as
|
|
// getelementptr instructions to not use the Cast!
|
|
G1->replaceAllUsesWith(ConstantExpr::getCast(NG, G1->getType()));
|
|
G2->replaceAllUsesWith(ConstantExpr::getCast(NG, G2->getType()));
|
|
|
|
// Remove the two globals from the module now...
|
|
M->getGlobalList().erase(G1);
|
|
M->getGlobalList().erase(G2);
|
|
|
|
// Put the new global into the AppendingVars map so that we can handle
|
|
// linking of more than two vars...
|
|
Second->second = NG;
|
|
}
|
|
AppendingVars.erase(First);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
// LinkModules - This function links two modules together, with the resulting
|
|
// left module modified to be the composite of the two input modules. If an
|
|
// error occurs, true is returned and ErrorMsg (if not null) is set to indicate
|
|
// the problem. Upon failure, the Dest module could be in a modified state, and
|
|
// shouldn't be relied on to be consistent.
|
|
//
|
|
bool llvm::LinkModules(Module *Dest, const Module *Src, std::string *ErrorMsg) {
|
|
if (Dest->getEndianness() == Module::AnyEndianness)
|
|
Dest->setEndianness(Src->getEndianness());
|
|
if (Dest->getPointerSize() == Module::AnyPointerSize)
|
|
Dest->setPointerSize(Src->getPointerSize());
|
|
|
|
if (Src->getEndianness() != Module::AnyEndianness &&
|
|
Dest->getEndianness() != Src->getEndianness())
|
|
std::cerr << "WARNING: Linking two modules of different endianness!\n";
|
|
if (Src->getPointerSize() != Module::AnyPointerSize &&
|
|
Dest->getPointerSize() != Src->getPointerSize())
|
|
std::cerr << "WARNING: Linking two modules of different pointer size!\n";
|
|
|
|
// LinkTypes - Go through the symbol table of the Src module and see if any
|
|
// types are named in the src module that are not named in the Dst module.
|
|
// Make sure there are no type name conflicts.
|
|
//
|
|
if (LinkTypes(Dest, Src, ErrorMsg)) return true;
|
|
|
|
// ValueMap - Mapping of values from what they used to be in Src, to what they
|
|
// are now in Dest.
|
|
//
|
|
std::map<const Value*, Value*> ValueMap;
|
|
|
|
// AppendingVars - Keep track of global variables in the destination module
|
|
// with appending linkage. After the module is linked together, they are
|
|
// appended and the module is rewritten.
|
|
//
|
|
std::multimap<std::string, GlobalVariable *> AppendingVars;
|
|
|
|
// GlobalsByName - The LLVM SymbolTable class fights our best efforts at
|
|
// linking by separating globals by type. Until PR411 is fixed, we replicate
|
|
// it's functionality here.
|
|
std::map<std::string, GlobalValue*> GlobalsByName;
|
|
|
|
for (Module::giterator I = Dest->gbegin(), E = Dest->gend(); I != E; ++I) {
|
|
// Add all of the appending globals already in the Dest module to
|
|
// AppendingVars.
|
|
if (I->hasAppendingLinkage())
|
|
AppendingVars.insert(std::make_pair(I->getName(), I));
|
|
|
|
// Keep track of all globals by name.
|
|
if (!I->hasInternalLinkage() && I->hasName())
|
|
GlobalsByName[I->getName()] = I;
|
|
}
|
|
|
|
// Keep track of all globals by name.
|
|
for (Module::iterator I = Dest->begin(), E = Dest->end(); I != E; ++I)
|
|
if (!I->hasInternalLinkage() && I->hasName())
|
|
GlobalsByName[I->getName()] = I;
|
|
|
|
// Insert all of the globals in src into the Dest module... without linking
|
|
// initializers (which could refer to functions not yet mapped over).
|
|
//
|
|
if (LinkGlobals(Dest, Src, ValueMap, AppendingVars, GlobalsByName, ErrorMsg))
|
|
return true;
|
|
|
|
// Link the functions together between the two modules, without doing function
|
|
// bodies... this just adds external function prototypes to the Dest
|
|
// function... We do this so that when we begin processing function bodies,
|
|
// all of the global values that may be referenced are available in our
|
|
// ValueMap.
|
|
//
|
|
if (LinkFunctionProtos(Dest, Src, ValueMap, GlobalsByName, ErrorMsg))
|
|
return true;
|
|
|
|
// Update the initializers in the Dest module now that all globals that may
|
|
// be referenced are in Dest.
|
|
//
|
|
if (LinkGlobalInits(Dest, Src, ValueMap, ErrorMsg)) return true;
|
|
|
|
// Link in the function bodies that are defined in the source module into the
|
|
// DestModule. This consists basically of copying the function over and
|
|
// fixing up references to values.
|
|
//
|
|
if (LinkFunctionBodies(Dest, Src, ValueMap, ErrorMsg)) return true;
|
|
|
|
// If there were any appending global variables, link them together now.
|
|
//
|
|
if (LinkAppendingVars(Dest, AppendingVars, ErrorMsg)) return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
// vim: sw=2
|