// 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 global variables between the two modules
+// * Uninit + Uninit = Init, Init + Uninit = Init, Init + Init = Error if !=
+// * Merges methods between two modules
//
//===----------------------------------------------------------------------===//
#include "llvm/SymbolTable.h"
#include "llvm/DerivedTypes.h"
#include "llvm/iOther.h"
+#include "llvm/ConstantVals.h"
+#include <iostream>
+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...
#include "llvm/Assembly/Writer.h" // TODO: REMOVE
+
+// 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() + "'. Dest='" +
+ 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
+ << " To: " << (void*)I->second << " " << I->second << "\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(Value *In, map<const Value*, Value*> &LocalMap,
+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 (I != GlobalMap->end()) return I->second;
}
- if (!isa<ConstPoolVal>(In))
- cerr << "Couldn't remap value: " << In << endl;
- return In;
+ // Check to see if it's a constant that we are interesting in transforming...
+ if (Constant *CPV = dyn_cast<Constant>(In)) {
+ if (!isa<DerivedType>(CPV->getType()))
+ return CPV; // Simple constants stay identical...
+
+ Constant *Result = 0;
+
+ if (ConstantArray *CPA = dyn_cast<ConstantArray>(CPV)) {
+ const std::vector<Use> &Ops = CPA->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 = ConstantArray::get(cast<ArrayType>(CPA->getType()), Operands);
+ } else if (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 = CPV;
+ } else if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(CPV)) {
+ Value *V = RemapOperand(CPR->getValue(), LocalMap, GlobalMap);
+ Result = ConstantPointerRef::get(cast<GlobalValue>(V));
+ } else {
+ assert(0 && "Unknown type of derived type constant value!");
+ }
+
+ // Cache the mapping in our local map structure...
+ LocalMap.insert(std::make_pair(In, CPV));
+ 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;
}
// 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 *GV = *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 (GV->hasName() && (V = ST->lookup(GV->getType(), GV->getName()))) {
+ 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 Methods,
// 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 (GV->isConstant() != DGV->isConstant())
+ if (SGV->isConstant() != DGV->isConstant())
return Error(Err, "Global Variable Collision on '" +
- GV->getType()->getDescription() + "':%" + GV->getName() +
+ SGV->getType()->getDescription() + "':%" + SGV->getName() +
" - Global variables differ in const'ness");
- // Check to make sure that they both have the same initializer if they are
- // both initialized...
- //
- // TODO: Check to see if they have DEEP equality. For Module level constants
- if (GV->hasInitializer() && DGV->hasInitializer() &&
- GV->getInitializer() != DGV->getInitializer())
- return Error(Err, "Global Variable Collision on '" +
- GV->getType()->getDescription() + "':%" + GV->getName() +
- " - Global variables have different initializers");
-
- // Okay, everything is cool, remember the mapping and update the
- // initializer if neccesary...
- //
-// TODO: We might have to map module level constants here!
- if (GV->hasInitializer() && !DGV->hasInitializer())
- DGV->setInitializer(GV->getInitializer());
-
- ValueMap.insert(make_pair(GV, DGV));
+ // 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...
-// TODO: Provide constpoolval mapping for initializer if using module local
-// initializers!
- GlobalVariable *NGV =
- new GlobalVariable(GV->getType()->getValueType(), GV->isConstant(),
- GV->hasInitializer() ? GV->getInitializer() : 0,
- GV->getName());
+ // 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(NGV);
+ Dest->getGlobalList().push_back(DGV);
// Make sure to remember this mapping...
- ValueMap.insert(make_pair(GV, NGV));
+ 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;
+}
// LinkMethodProtos - Link the methods together between the two modules, without
// doing method bodies... this just adds external method prototypes to the Dest
// If the method has a name, and that name is already in use in the
// Dest module, make sure that the name is a compatible method...
//
- if (SM->hasName() && (V = ST->lookup(SM->getType(), SM->getName()))) {
+ if (SM->hasExternalLinkage() && SM->hasName() &&
+ (V = ST->lookup(SM->getType(), SM->getName())) &&
+ cast<Method>(V)->hasExternalLinkage()) {
// The same named thing is a Method, because the only two things
// that may be in a module level symbol table are Global Vars and Methods,
// and they both have distinct, nonoverlapping, possible types.
SM->getName() + "\" - Method is already defined!");
// Otherwise, just remember this mapping...
- ValueMap.insert(make_pair(SM, DM));
+ ValueMap.insert(std::make_pair(SM, DM));
} else {
// Method does not already exist, simply insert an external method
// signature identical to SM into the dest module...
- Method *DM = new Method(SM->getMethodType(), SM->getName());
+ Method *DM = new Method(SM->getMethodType(), SM->hasInternalLinkage(),
+ SM->getName());
// Add the method signature to the dest module...
Dest->getMethodList().push_back(DM);
// ... and remember this mapping...
- ValueMap.insert(make_pair(SM, DM));
+ ValueMap.insert(std::make_pair(SM, DM));
}
}
return false;
Dest->getArgumentList().push_back(DMA);
// Add a mapping to our local map
- LocalMap.insert(make_pair(SMA, DMA));
+ LocalMap.insert(std::make_pair(SMA, DMA));
}
// Loop over all of the basic blocks, copying the instructions over...
// Create new basic block and add to mapping and the Dest method...
BasicBlock *DBB = new BasicBlock(SBB->getName(), Dest);
- LocalMap.insert(make_pair(SBB, DBB));
+ LocalMap.insert(std::make_pair(SBB, 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
II != IE; ++II) {
const Instruction *SI = *II;
Instruction *DI = SI->clone();
+ DI->setName(SI->getName());
DBB->getInstList().push_back(DI);
- LocalMap.insert(make_pair(SI, DI));
+ LocalMap.insert(std::make_pair(SI, DI));
}
}
// Loop over all of the methods in the src module, mapping them over as we go
//
for (Module::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) {
- const Method *SM = *I; // Source Method
- Method *DM = cast<Method>(ValueMap[SM]); // Destination method
+ const Method *SM = *I; // Source Method
+ if (!SM->isExternal()) { // No body if method is external
+ Method *DM = cast<Method>(ValueMap[SM]); // Destination method
+
+ // DM not external SM external?
+ if (!DM->isExternal()) {
+ if (Err)
+ *Err = "Method '" + (SM->hasName() ? SM->getName() : string("")) +
+ "' body multiply defined!";
+ return true;
+ }
- assert(DM && DM->isExternal() && "LinkMethodProtos failed!");
- if (!SM->isExternal()) // External methods are already done
if (LinkMethodBody(DM, SM, ValueMap, Err)) return true;
+ }
}
return false;
}
// shouldn't be relied on to be consistent.
//
bool LinkModules(Module *Dest, const Module *Src, string *ErrorMsg = 0) {
+
+ // 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;
- // Link the globals variables together between the two modules...
+ // Insert all of the globals in src into the Dest module... without
+ // initializers
if (LinkGlobals(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 the methods together between the two modules, without doing method
// bodies... this just adds external method prototypes to the Dest method...
// We do this so that when we begin processing method bodies, all of the
return false;
}
+
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