mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-10-31 09:11:13 +00:00
d149c053cd
This bug was exposed linking the SPEC benchmark suite. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3888 91177308-0d34-0410-b5e6-96231b3b80d8
449 lines
18 KiB
C++
449 lines
18 KiB
C++
//===- Linker.cpp - Module Linker Implementation --------------------------===//
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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/Transforms/Utils/Linker.h"
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#include "llvm/Module.h"
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#include "llvm/SymbolTable.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/iOther.h"
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#include "llvm/Constants.h"
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using std::cerr;
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using std::string;
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using std::map;
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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(string *E, string Message) {
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if (E) *E = Message;
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return true;
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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, string *Err = 0) {
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// No symbol table? Can't have named types.
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if (!Src->hasSymbolTable()) return false;
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SymbolTable *DestST = Dest->getSymbolTableSure();
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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::const_iterator PI = SrcST->find(Type::TypeTy);
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if (PI == SrcST->end()) return false; // No named types, do nothing.
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const SymbolTable::VarMap &VM = PI->second;
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for (SymbolTable::type_const_iterator I = VM.begin(), E = VM.end();
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I != E; ++I) {
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const string &Name = I->first;
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const Type *RHS = cast<Type>(I->second);
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// Check to see if this type name is already in the dest module...
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const Type *Entry = cast_or_null<Type>(DestST->lookup(Type::TypeTy, Name));
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if (Entry) { // Yup, the value already exists...
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if (Entry != RHS) // If it's the same, noop. Otherwise, error.
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return Error(Err, "Type named '" + Name +
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"' of different shape in modules.\n Src='" +
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Entry->getDescription() + "'.\n Dst='" +
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RHS->getDescription() + "'");
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} else { // Type not in dest module. Add it now.
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// TODO: FIXME WHEN TYPES AREN'T CONST
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DestST->insert(Name, const_cast<Type*>(RHS));
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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 map<const Value*, Value*> &M) {
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for (map<const Value*, Value*>::const_iterator I = M.begin(), E = M.end();
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I != E; ++I) {
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cerr << " Fr: " << (void*)I->first << " ";
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I->first->dump();
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cerr << " To: " << (void*)I->second << " ";
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I->second->dump();
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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, map<const Value*, Value*> &LocalMap,
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map<const Value*, Value*> *GlobalMap = 0) {
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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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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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const std::vector<Use> &Ops = CPA->getValues();
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std::vector<Constant*> Operands(Ops.size());
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for (unsigned i = 0, e = Ops.size(); i != e; ++i)
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Operands[i] =
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cast<Constant>(RemapOperand(Ops[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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const std::vector<Use> &Ops = CPS->getValues();
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std::vector<Constant*> Operands(Ops.size());
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for (unsigned i = 0; i < Ops.size(); ++i)
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Operands[i] =
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cast<Constant>(RemapOperand(Ops[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 (const ConstantPointerRef *CPR =
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dyn_cast<ConstantPointerRef>(CPV)) {
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Value *V = RemapOperand(CPR->getValue(), LocalMap, GlobalMap);
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Result = ConstantPointerRef::get(cast<GlobalValue>(V));
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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() == 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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cerr << "XXX LocalMap: \n";
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PrintMap(LocalMap);
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if (GlobalMap) {
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cerr << "XXX GlobalMap: \n";
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PrintMap(*GlobalMap);
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}
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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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// 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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map<const Value*, Value*> &ValueMap, string *Err = 0) {
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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 = Src->getSymbolTable() ? Dest->getSymbolTableSure() : 0;
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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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Value *V;
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// If the global variable has a name, and that name is already in use in the
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// Dest module, make sure that the name is a compatible global variable...
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//
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if (SGV->hasExternalLinkage() && SGV->hasName() &&
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(V = ST->lookup(SGV->getType(), SGV->getName())) &&
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cast<GlobalVariable>(V)->hasExternalLinkage()) {
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// The same named thing is a global variable, because the only two things
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// that may be in a module level symbol table are Global Vars and
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// Functions, and they both have distinct, nonoverlapping, possible types.
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//
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GlobalVariable *DGV = cast<GlobalVariable>(V);
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// Check to see if the two GV's have the same Const'ness...
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if (SGV->isConstant() != DGV->isConstant())
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return Error(Err, "Global Variable Collision on '" +
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SGV->getType()->getDescription() + "':%" + SGV->getName() +
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" - Global variables differ in const'ness");
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// Okay, everything is cool, remember the mapping...
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ValueMap.insert(std::make_pair(SGV, DGV));
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} else {
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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 *DGV =
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new GlobalVariable(SGV->getType()->getElementType(), SGV->isConstant(),
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SGV->hasInternalLinkage(), 0, SGV->getName());
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// Add the new global to the dest module
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Dest->getGlobalList().push_back(DGV);
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// Make sure to remember this mapping...
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ValueMap.insert(std::make_pair(SGV, DGV));
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}
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}
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return false;
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}
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// LinkGlobalInits - Update the initializers in the Dest module now that all
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// globals that may be referenced are in Dest.
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//
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static bool LinkGlobalInits(Module *Dest, const Module *Src,
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map<const Value*, Value*> &ValueMap,
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string *Err = 0) {
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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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if (SGV->hasInitializer()) { // Only process initialized GV's
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// Figure out what the initializer looks like in the dest module...
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Constant *DInit =
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cast<Constant>(RemapOperand(SGV->getInitializer(), ValueMap));
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GlobalVariable *DGV = cast<GlobalVariable>(ValueMap[SGV]);
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if (DGV->hasInitializer() && SGV->hasExternalLinkage() &&
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DGV->hasExternalLinkage()) {
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if (DGV->getInitializer() != DInit)
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return Error(Err, "Global Variable Collision on '" +
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SGV->getType()->getDescription() + "':%" +SGV->getName()+
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" - Global variables have different initializers");
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} else {
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// Copy the initializer over now...
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DGV->setInitializer(DInit);
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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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// LinkFunctionProtos - Link the functions together between the two modules,
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// without doing function bodies... this just adds external function prototypes
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// to the Dest function...
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//
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static bool LinkFunctionProtos(Module *Dest, const Module *Src,
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map<const Value*, Value*> &ValueMap,
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string *Err = 0) {
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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 = Src->getSymbolTable() ? Dest->getSymbolTableSure() : 0;
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// Loop over all of the functions in the src module, mapping them over as we
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// go
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//
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for (Module::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) {
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const Function *SF = I; // SrcFunction
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Value *V;
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// If the function has a name, and that name is already in use in the Dest
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// module, make sure that the name is a compatible function...
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//
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if (SF->hasExternalLinkage() && SF->hasName() &&
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(V = ST->lookup(SF->getType(), SF->getName())) &&
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cast<Function>(V)->hasExternalLinkage()) {
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// The same named thing is a Function, because the only two things
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// that may be in a module level symbol table are Global Vars and
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// Functions, and they both have distinct, nonoverlapping, possible types.
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//
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Function *DF = cast<Function>(V); // DestFunction
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// Check to make sure the function is not defined in both modules...
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if (!SF->isExternal() && !DF->isExternal())
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return Error(Err, "Function '" +
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SF->getFunctionType()->getDescription() + "':\"" +
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SF->getName() + "\" - Function is already defined!");
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// Otherwise, just remember this mapping...
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ValueMap.insert(std::make_pair(SF, DF));
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} else {
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// Function does not already exist, simply insert an external function
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// signature identical to SF into the dest module...
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Function *DF = new Function(SF->getFunctionType(),
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SF->hasInternalLinkage(),
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SF->getName());
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// Add the function signature to the dest module...
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Dest->getFunctionList().push_back(DF);
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// ... and remember this mapping...
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ValueMap.insert(std::make_pair(SF, DF));
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}
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}
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return false;
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}
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// LinkFunctionBody - Copy the source function over into the dest function and
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// fix up references to values. At this point we know that Dest is an external
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// function, and that Src is not.
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//
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static bool LinkFunctionBody(Function *Dest, const Function *Src,
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map<const Value*, Value*> &GlobalMap,
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string *Err = 0) {
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assert(Src && Dest && Dest->isExternal() && !Src->isExternal());
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map<const Value*, Value*> LocalMap; // Map for function local values
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// Go through and convert function arguments over...
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for (Function::const_aiterator I = Src->abegin(), E = Src->aend();
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I != E; ++I) {
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// Create the new function argument and add to the dest function...
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Argument *DFA = new Argument(I->getType(), I->getName());
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Dest->getArgumentList().push_back(DFA);
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// Add a mapping to our local map
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LocalMap.insert(std::make_pair(I, DFA));
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}
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// Loop over all of the basic blocks, copying the instructions over...
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//
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for (Function::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) {
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// Create new basic block and add to mapping and the Dest function...
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BasicBlock *DBB = new BasicBlock(I->getName(), Dest);
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LocalMap.insert(std::make_pair(I, DBB));
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// Loop over all of the instructions in the src basic block, copying them
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// over. Note that this is broken in a strict sense because the cloned
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// instructions will still be referencing values in the Src module, not
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// the remapped values. In our case, however, we will not get caught and
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// so we can delay patching the values up until later...
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//
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for (BasicBlock::const_iterator II = I->begin(), IE = I->end();
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II != IE; ++II) {
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Instruction *DI = II->clone();
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DI->setName(II->getName());
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DBB->getInstList().push_back(DI);
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LocalMap.insert(std::make_pair(II, DI));
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}
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}
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// At this point, all of the instructions and values of the function are now
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// copied over. The only problem is that they are still referencing values in
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// the Source function as operands. Loop through all of the operands of the
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// functions and patch them up to point to the local versions...
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//
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for (Function::iterator BB = Dest->begin(), BE = Dest->end(); BB != BE; ++BB)
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for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I)
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for (Instruction::op_iterator OI = I->op_begin(), OE = I->op_end();
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OI != OE; ++OI)
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*OI = RemapOperand(*OI, LocalMap, &GlobalMap);
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return false;
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}
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// LinkFunctionBodies - Link in the function bodies that are defined in the
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// source module into the DestModule. This consists basically of copying the
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// function over and fixing up references to values.
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//
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static bool LinkFunctionBodies(Module *Dest, const Module *Src,
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map<const Value*, Value*> &ValueMap,
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string *Err = 0) {
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// Loop over all of the functions in the src module, mapping them over as we
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// go
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//
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for (Module::const_iterator SF = Src->begin(), E = Src->end(); SF != E; ++SF){
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if (!SF->isExternal()) { // No body if function is external
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Function *DF = cast<Function>(ValueMap[SF]); // Destination function
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// DF not external SF external?
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if (!DF->isExternal()) {
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if (Err)
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*Err = "Function '" + (SF->hasName() ? SF->getName() : string("")) +
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"' body multiply defined!";
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return true;
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}
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if (LinkFunctionBody(DF, SF, ValueMap, Err)) return true;
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}
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}
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return false;
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}
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// LinkModules - This function links two modules together, with the resulting
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// left module modified to be the composite of the two input modules. If an
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// error occurs, true is returned and ErrorMsg (if not null) is set to indicate
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// the problem. Upon failure, the Dest module could be in a modified state, and
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// shouldn't be relied on to be consistent.
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//
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bool LinkModules(Module *Dest, const Module *Src, string *ErrorMsg) {
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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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if (LinkTypes(Dest, Src, ErrorMsg)) return true;
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// ValueMap - Mapping of values from what they used to be in Src, to what they
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// are now in Dest.
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//
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map<const Value*, Value*> ValueMap;
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// Insert all of the globals in src into the Dest module... without
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// initializers
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if (LinkGlobals(Dest, Src, ValueMap, ErrorMsg)) return true;
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// Link the functions together between the two modules, without doing function
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// bodies... this just adds external function prototypes to the Dest
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// function... We do this so that when we begin processing function bodies,
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// all of the global values that may be referenced are available in our
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// ValueMap.
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//
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if (LinkFunctionProtos(Dest, Src, ValueMap, ErrorMsg)) return true;
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// Update the initializers in the Dest module now that all globals that may
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// be referenced are in Dest.
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//
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if (LinkGlobalInits(Dest, Src, ValueMap, ErrorMsg)) return true;
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// Link in the function bodies that are defined in the source module into the
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// DestModule. This consists basically of copying the function over and
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// fixing up references to values.
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//
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if (LinkFunctionBodies(Dest, Src, ValueMap, ErrorMsg)) return true;
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return false;
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}
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