mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-01 15:11:24 +00:00
b319faff77
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3412 91177308-0d34-0410-b5e6-96231b3b80d8
446 lines
18 KiB
C++
446 lines
18 KiB
C++
//===- Linker.cpp - Module Linker Implementation --------------------------===//
|
|
//
|
|
// This file implements the LLVM module linker.
|
|
//
|
|
// Specifically, this:
|
|
// * Merges global variables between the two modules
|
|
// * Uninit + Uninit = Init, Init + Uninit = Init, Init + Init = Error if !=
|
|
// * Merges functions between two modules
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Transforms/Utils/Linker.h"
|
|
#include "llvm/Module.h"
|
|
#include "llvm/SymbolTable.h"
|
|
#include "llvm/DerivedTypes.h"
|
|
#include "llvm/iOther.h"
|
|
#include "llvm/Constants.h"
|
|
using std::cerr;
|
|
using std::string;
|
|
using std::map;
|
|
|
|
// Error - Simple wrapper function to conditionally assign to E and return true.
|
|
// This just makes error return conditions a little bit simpler...
|
|
//
|
|
static inline bool Error(string *E, string Message) {
|
|
if (E) *E = Message;
|
|
return true;
|
|
}
|
|
|
|
// 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.
|
|
//
|
|
static bool LinkTypes(Module *Dest, const Module *Src, string *Err = 0) {
|
|
// No symbol table? Can't have named types.
|
|
if (!Src->hasSymbolTable()) return false;
|
|
|
|
SymbolTable *DestST = Dest->getSymbolTableSure();
|
|
const SymbolTable *SrcST = Src->getSymbolTable();
|
|
|
|
// Look for a type plane for Type's...
|
|
SymbolTable::const_iterator PI = SrcST->find(Type::TypeTy);
|
|
if (PI == SrcST->end()) return false; // No named types, do nothing.
|
|
|
|
const SymbolTable::VarMap &VM = PI->second;
|
|
for (SymbolTable::type_const_iterator I = VM.begin(), E = VM.end();
|
|
I != E; ++I) {
|
|
const string &Name = I->first;
|
|
const Type *RHS = cast<Type>(I->second);
|
|
|
|
// Check to see if this type name is already in the dest module...
|
|
const Type *Entry = cast_or_null<Type>(DestST->lookup(Type::TypeTy, Name));
|
|
if (Entry) { // Yup, the value already exists...
|
|
if (Entry != RHS) // If it's the same, noop. Otherwise, error.
|
|
return Error(Err, "Type named '" + Name +
|
|
"' of different shape in modules.\n Src='" +
|
|
Entry->getDescription() + "'.\n Dst='" +
|
|
RHS->getDescription() + "'");
|
|
} else { // Type not in dest module. Add it now.
|
|
// TODO: FIXME WHEN TYPES AREN'T CONST
|
|
DestST->insert(Name, const_cast<Type*>(RHS));
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static void PrintMap(const map<const Value*, Value*> &M) {
|
|
for (map<const Value*, Value*>::const_iterator I = M.begin(), E = M.end();
|
|
I != E; ++I) {
|
|
cerr << " Fr: " << (void*)I->first << " ";
|
|
I->first->dump();
|
|
cerr << " To: " << (void*)I->second << " ";
|
|
I->second->dump();
|
|
cerr << "\n";
|
|
}
|
|
}
|
|
|
|
|
|
// RemapOperand - Use LocalMap and GlobalMap to convert references from one
|
|
// module to another. This is somewhat sophisticated in that it can
|
|
// automatically handle constant references correctly as well...
|
|
//
|
|
static Value *RemapOperand(const Value *In, map<const Value*, Value*> &LocalMap,
|
|
const map<const Value*, Value*> *GlobalMap = 0) {
|
|
map<const Value*,Value*>::const_iterator I = LocalMap.find(In);
|
|
if (I != LocalMap.end()) return I->second;
|
|
|
|
if (GlobalMap) {
|
|
I = GlobalMap->find(In);
|
|
if (I != GlobalMap->end()) return I->second;
|
|
}
|
|
|
|
// Check to see if it's a constant that we are interesting in transforming...
|
|
if (const Constant *CPV = dyn_cast<Constant>(In)) {
|
|
if (!isa<DerivedType>(CPV->getType()) && !isa<ConstantExpr>(CPV))
|
|
return const_cast<Constant*>(CPV); // Simple constants stay identical...
|
|
|
|
Constant *Result = 0;
|
|
|
|
if (const ConstantArray *CPA = dyn_cast<ConstantArray>(CPV)) {
|
|
const std::vector<Use> &Ops = CPA->getValues();
|
|
std::vector<Constant*> Operands(Ops.size());
|
|
for (unsigned i = 0, e = Ops.size(); i != e; ++i)
|
|
Operands[i] =
|
|
cast<Constant>(RemapOperand(Ops[i], LocalMap, GlobalMap));
|
|
Result = ConstantArray::get(cast<ArrayType>(CPA->getType()), Operands);
|
|
} else if (const ConstantStruct *CPS = dyn_cast<ConstantStruct>(CPV)) {
|
|
const std::vector<Use> &Ops = CPS->getValues();
|
|
std::vector<Constant*> Operands(Ops.size());
|
|
for (unsigned i = 0; i < Ops.size(); ++i)
|
|
Operands[i] =
|
|
cast<Constant>(RemapOperand(Ops[i], LocalMap, GlobalMap));
|
|
Result = ConstantStruct::get(cast<StructType>(CPS->getType()), Operands);
|
|
} else if (isa<ConstantPointerNull>(CPV)) {
|
|
Result = const_cast<Constant*>(CPV);
|
|
} else if (const ConstantPointerRef *CPR =
|
|
dyn_cast<ConstantPointerRef>(CPV)) {
|
|
Value *V = RemapOperand(CPR->getValue(), LocalMap, GlobalMap);
|
|
Result = ConstantPointerRef::get(cast<GlobalValue>(V));
|
|
} else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
|
|
if (CE->getOpcode() == Instruction::GetElementPtr) {
|
|
Value *Ptr = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap);
|
|
std::vector<Constant*> Indices;
|
|
Indices.reserve(CE->getNumOperands()-1);
|
|
for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i)
|
|
Indices.push_back(cast<Constant>(RemapOperand(CE->getOperand(i),
|
|
LocalMap, GlobalMap)));
|
|
|
|
Result = ConstantExpr::getGetElementPtr(cast<Constant>(Ptr), Indices);
|
|
} else if (CE->getNumOperands() == 1) {
|
|
// Cast instruction
|
|
assert(CE->getOpcode() == Instruction::Cast);
|
|
Value *V = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap);
|
|
Result = ConstantExpr::getCast(cast<Constant>(V), CE->getType());
|
|
} else if (CE->getNumOperands() == 2) {
|
|
// Binary operator...
|
|
Value *V1 = RemapOperand(CE->getOperand(0), LocalMap, GlobalMap);
|
|
Value *V2 = RemapOperand(CE->getOperand(1), LocalMap, GlobalMap);
|
|
|
|
Result = ConstantExpr::get(CE->getOpcode(), cast<Constant>(V1),
|
|
cast<Constant>(V2));
|
|
} else {
|
|
assert(0 && "Unknown constant expr type!");
|
|
}
|
|
|
|
} else {
|
|
assert(0 && "Unknown type of derived type constant value!");
|
|
}
|
|
|
|
// Cache the mapping in our local map structure...
|
|
LocalMap.insert(std::make_pair(In, Result));
|
|
return Result;
|
|
}
|
|
|
|
cerr << "XXX LocalMap: \n";
|
|
PrintMap(LocalMap);
|
|
|
|
if (GlobalMap) {
|
|
cerr << "XXX GlobalMap: \n";
|
|
PrintMap(*GlobalMap);
|
|
}
|
|
|
|
cerr << "Couldn't remap value: " << (void*)In << " " << *In << "\n";
|
|
assert(0 && "Couldn't remap value!");
|
|
return 0;
|
|
}
|
|
|
|
|
|
// LinkGlobals - Loop through the global variables in the src module and merge
|
|
// them into the dest module...
|
|
//
|
|
static bool LinkGlobals(Module *Dest, const Module *Src,
|
|
map<const Value*, Value*> &ValueMap, string *Err = 0) {
|
|
// We will need a module level symbol table if the src module has a module
|
|
// level symbol table...
|
|
SymbolTable *ST = Src->getSymbolTable() ? Dest->getSymbolTableSure() : 0;
|
|
|
|
// 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;
|
|
Value *V;
|
|
|
|
// If the global variable has a name, and that name is already in use in the
|
|
// Dest module, make sure that the name is a compatible global variable...
|
|
//
|
|
if (SGV->hasExternalLinkage() && SGV->hasName() &&
|
|
(V = ST->lookup(SGV->getType(), SGV->getName())) &&
|
|
cast<GlobalVariable>(V)->hasExternalLinkage()) {
|
|
// The same named thing is a global variable, because the only two things
|
|
// that may be in a module level symbol table are Global Vars and
|
|
// Functions, and they both have distinct, nonoverlapping, possible types.
|
|
//
|
|
GlobalVariable *DGV = cast<GlobalVariable>(V);
|
|
|
|
// Check to see if the two GV's have the same Const'ness...
|
|
if (SGV->isConstant() != DGV->isConstant())
|
|
return Error(Err, "Global Variable Collision on '" +
|
|
SGV->getType()->getDescription() + "':%" + SGV->getName() +
|
|
" - Global variables differ in const'ness");
|
|
|
|
// Okay, everything is cool, remember the mapping...
|
|
ValueMap.insert(std::make_pair(SGV, DGV));
|
|
} else {
|
|
// No linking to be performed, simply create an identical version of the
|
|
// symbol over in the dest module... the initializer will be filled in
|
|
// later by LinkGlobalInits...
|
|
//
|
|
GlobalVariable *DGV =
|
|
new GlobalVariable(SGV->getType()->getElementType(), SGV->isConstant(),
|
|
SGV->hasInternalLinkage(), 0, SGV->getName());
|
|
|
|
// Add the new global to the dest module
|
|
Dest->getGlobalList().push_back(DGV);
|
|
|
|
// Make sure to remember this mapping...
|
|
ValueMap.insert(std::make_pair(SGV, DGV));
|
|
}
|
|
}
|
|
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,
|
|
map<const Value*, Value*> &ValueMap,
|
|
string *Err = 0) {
|
|
|
|
// 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 *DInit =
|
|
cast<Constant>(RemapOperand(SGV->getInitializer(), ValueMap));
|
|
|
|
GlobalVariable *DGV = cast<GlobalVariable>(ValueMap[SGV]);
|
|
if (DGV->hasInitializer() && SGV->hasExternalLinkage() &&
|
|
DGV->hasExternalLinkage()) {
|
|
if (DGV->getInitializer() != DInit)
|
|
return Error(Err, "Global Variable Collision on '" +
|
|
SGV->getType()->getDescription() + "':%" +SGV->getName()+
|
|
" - Global variables have different initializers");
|
|
} else {
|
|
// Copy the initializer over now...
|
|
DGV->setInitializer(DInit);
|
|
}
|
|
}
|
|
}
|
|
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,
|
|
map<const Value*, Value*> &ValueMap,
|
|
string *Err = 0) {
|
|
// We will need a module level symbol table if the src module has a module
|
|
// level symbol table...
|
|
SymbolTable *ST = Src->getSymbolTable() ? Dest->getSymbolTableSure() : 0;
|
|
|
|
// 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
|
|
Value *V;
|
|
|
|
// If the function has a name, and that name is already in use in the Dest
|
|
// module, make sure that the name is a compatible function...
|
|
//
|
|
if (SF->hasExternalLinkage() && SF->hasName() &&
|
|
(V = ST->lookup(SF->getType(), SF->getName())) &&
|
|
cast<Function>(V)->hasExternalLinkage()) {
|
|
// The same named thing is a Function, because the only two things
|
|
// that may be in a module level symbol table are Global Vars and
|
|
// Functions, and they both have distinct, nonoverlapping, possible types.
|
|
//
|
|
Function *DF = cast<Function>(V); // DestFunction
|
|
|
|
// Check to make sure the function is not defined in both modules...
|
|
if (!SF->isExternal() && !DF->isExternal())
|
|
return Error(Err, "Function '" +
|
|
SF->getFunctionType()->getDescription() + "':\"" +
|
|
SF->getName() + "\" - Function is already defined!");
|
|
|
|
// Otherwise, just remember this mapping...
|
|
ValueMap.insert(std::make_pair(SF, DF));
|
|
} else {
|
|
// Function does not already exist, simply insert an external function
|
|
// signature identical to SF into the dest module...
|
|
Function *DF = new Function(SF->getFunctionType(),
|
|
SF->hasInternalLinkage(),
|
|
SF->getName());
|
|
|
|
// Add the function signature to the dest module...
|
|
Dest->getFunctionList().push_back(DF);
|
|
|
|
// ... and remember this mapping...
|
|
ValueMap.insert(std::make_pair(SF, DF));
|
|
}
|
|
}
|
|
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,
|
|
const map<const Value*, Value*> &GlobalMap,
|
|
string *Err = 0) {
|
|
assert(Src && Dest && Dest->isExternal() && !Src->isExternal());
|
|
map<const Value*, Value*> LocalMap; // Map for function local values
|
|
|
|
// Go through and convert function arguments over...
|
|
for (Function::const_aiterator I = Src->abegin(), E = Src->aend();
|
|
I != E; ++I) {
|
|
// Create the new function argument and add to the dest function...
|
|
Argument *DFA = new Argument(I->getType(), I->getName());
|
|
Dest->getArgumentList().push_back(DFA);
|
|
|
|
// Add a mapping to our local map
|
|
LocalMap.insert(std::make_pair(I, DFA));
|
|
}
|
|
|
|
// 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,
|
|
map<const Value*, Value*> &ValueMap,
|
|
string *Err = 0) {
|
|
|
|
// 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()) {
|
|
if (Err)
|
|
*Err = "Function '" + (SF->hasName() ? SF->getName() : string("")) +
|
|
"' body multiply defined!";
|
|
return true;
|
|
}
|
|
|
|
if (LinkFunctionBody(DF, SF, ValueMap, Err)) return true;
|
|
}
|
|
}
|
|
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 LinkModules(Module *Dest, const Module *Src, string *ErrorMsg) {
|
|
|
|
// 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.
|
|
//
|
|
map<const Value*, Value*> ValueMap;
|
|
|
|
// Insert all of the globals in src into the Dest module... without
|
|
// initializers
|
|
if (LinkGlobals(Dest, Src, ValueMap, 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, 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;
|
|
|
|
return false;
|
|
}
|
|
|