//===----------------------------------------------------------------------===//
#include "llvm/Transforms/Linker.h"
+#include "llvm/Module.h"
+#include "llvm/Method.h"
+#include "llvm/GlobalVariable.h"
+#include "llvm/SymbolTable.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/iOther.h"
+
+// 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;
+}
+
+#include "llvm/Assembly/Writer.h" // TODO: REMOVE
+
+// 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,
+ 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;
+ }
+
+ if (!isa<ConstPoolVal>(In))
+ cerr << "Couldn't remap value: " << In << endl;
+ return In;
+}
+
+
+// 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 *GV = *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()))) {
+ // 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())
+ return Error(Err, "Global Variable Collision on '" +
+ GV->getType()->getDescription() + "':%" + GV->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));
+ } 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());
+
+ // Add the new global to the dest module
+ Dest->getGlobalList().push_back(NGV);
+
+ // Make sure to remember this mapping...
+ ValueMap.insert(make_pair(GV, NGV));
+ }
+ }
+ return false;
+}
+
+
+
+// LinkMethodProtos - Link the methods together between the two modules, without
+// doing method bodies... this just adds external method prototypes to the Dest
+// method...
+//
+static bool LinkMethodProtos(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 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; // SrcMethod
+ Value *V;
+
+ // 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()))) {
+ // 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.
+ //
+ Method *DM = cast<Method>(V); // DestMethod
+
+ // Check to make sure the method is not defined in both modules...
+ if (!SM->isExternal() && !DM->isExternal())
+ return Error(Err, "Method '" +
+ SM->getMethodType()->getDescription() + "':\"" +
+ SM->getName() + "\" - Method is already defined!");
+
+ // Otherwise, just remember this mapping...
+ ValueMap.insert(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());
+
+ // Add the method signature to the dest module...
+ Dest->getMethodList().push_back(DM);
+
+ // ... and remember this mapping...
+ ValueMap.insert(make_pair(SM, DM));
+ }
+ }
+ return false;
+}
+
+// LinkMethodBody - Copy the source method over into the dest method and fix up
+// references to values. At this point we know that Dest is an external method,
+// and that Src is not.
+//
+static bool LinkMethodBody(Method *Dest, const Method *Src,
+ const map<const Value*, Value*> &GlobalMap,
+ string *Err = 0) {
+ assert(Src && Dest && Dest->isExternal() && !Src->isExternal());
+ map<const Value*, Value*> LocalMap; // Map for method local values
+
+ // Go through and convert method arguments over...
+ for (Method::ArgumentListType::const_iterator
+ I = Src->getArgumentList().begin(),
+ E = Src->getArgumentList().end(); I != E; ++I) {
+ const MethodArgument *SMA = *I;
+
+ // Create the new method argument and add to the dest method...
+ MethodArgument *DMA = new MethodArgument(SMA->getType(), SMA->getName());
+ Dest->getArgumentList().push_back(DMA);
+
+ // Add a mapping to our local map
+ LocalMap.insert(make_pair(SMA, DMA));
+ }
+
+ // Loop over all of the basic blocks, copying the instructions over...
+ //
+ for (Method::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) {
+ const BasicBlock *SBB = *I;
+
+ // 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));
+
+ // 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 = SBB->begin(), IE = SBB->end();
+ II != IE; ++II) {
+ const Instruction *SI = *II;
+ Instruction *DI = SI->clone();
+ DBB->getInstList().push_back(DI);
+ LocalMap.insert(make_pair(SI, DI));
+ }
+ }
+
+ // At this point, all of the instructions and values of the method are now
+ // copied over. The only problem is that they are still referencing values
+ // in the Source method as operands. Loop through all of the operands of the
+ // methods and patch them up to point to the local versions...
+ //
+ for (Method::inst_iterator I = Dest->inst_begin(), E = Dest->inst_end();
+ I != E; ++I) {
+ Instruction *Inst = *I;
+
+ for (Instruction::op_iterator OI = Inst->op_begin(), OE = Inst->op_end();
+ OI != OE; ++OI)
+ *OI = RemapOperand(*OI, LocalMap, &GlobalMap);
+ }
+
+ return false;
+}
+
+
+// LinkMethodBodies - Link in the method bodies that are defined in the source
+// module into the DestModule. This consists basically of copying the method
+// over and fixing up references to values.
+//
+static bool LinkMethodBodies(Module *Dest, const Module *Src,
+ map<const Value*, Value*> &ValueMap,
+ string *Err = 0) {
+
+ // 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
+
+ assert(DM && DM->isExternal() && "LinkMethodProtos failed!");
+ if (!SM->isExternal()) // External methods are already done
+ if (LinkMethodBody(DM, SM, 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.
+// 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 = 0) {
+ // 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...
+ if (LinkGlobals(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
+ // global values that may be referenced are available in our ValueMap.
+ //
+ if (LinkMethodProtos(Dest, Src, ValueMap, ErrorMsg)) return true;
+
+ // Link in the method bodies that are defined in the source module into the
+ // DestModule. This consists basically of copying the method over and fixing
+ // up references to values.
+ //
+ if (LinkMethodBodies(Dest, Src, ValueMap, ErrorMsg)) return true;
return false;
}
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/Linker.h"
+#include "llvm/Module.h"
+#include "llvm/Method.h"
+#include "llvm/GlobalVariable.h"
+#include "llvm/SymbolTable.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/iOther.h"
+
+// 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;
+}
+
+#include "llvm/Assembly/Writer.h" // TODO: REMOVE
+
+// 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,
+ 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;
+ }
+
+ if (!isa<ConstPoolVal>(In))
+ cerr << "Couldn't remap value: " << In << endl;
+ return In;
+}
+
+
+// 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 *GV = *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()))) {
+ // 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())
+ return Error(Err, "Global Variable Collision on '" +
+ GV->getType()->getDescription() + "':%" + GV->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));
+ } 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());
+
+ // Add the new global to the dest module
+ Dest->getGlobalList().push_back(NGV);
+
+ // Make sure to remember this mapping...
+ ValueMap.insert(make_pair(GV, NGV));
+ }
+ }
+ return false;
+}
+
+
+
+// LinkMethodProtos - Link the methods together between the two modules, without
+// doing method bodies... this just adds external method prototypes to the Dest
+// method...
+//
+static bool LinkMethodProtos(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 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; // SrcMethod
+ Value *V;
+
+ // 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()))) {
+ // 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.
+ //
+ Method *DM = cast<Method>(V); // DestMethod
+
+ // Check to make sure the method is not defined in both modules...
+ if (!SM->isExternal() && !DM->isExternal())
+ return Error(Err, "Method '" +
+ SM->getMethodType()->getDescription() + "':\"" +
+ SM->getName() + "\" - Method is already defined!");
+
+ // Otherwise, just remember this mapping...
+ ValueMap.insert(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());
+
+ // Add the method signature to the dest module...
+ Dest->getMethodList().push_back(DM);
+
+ // ... and remember this mapping...
+ ValueMap.insert(make_pair(SM, DM));
+ }
+ }
+ return false;
+}
+
+// LinkMethodBody - Copy the source method over into the dest method and fix up
+// references to values. At this point we know that Dest is an external method,
+// and that Src is not.
+//
+static bool LinkMethodBody(Method *Dest, const Method *Src,
+ const map<const Value*, Value*> &GlobalMap,
+ string *Err = 0) {
+ assert(Src && Dest && Dest->isExternal() && !Src->isExternal());
+ map<const Value*, Value*> LocalMap; // Map for method local values
+
+ // Go through and convert method arguments over...
+ for (Method::ArgumentListType::const_iterator
+ I = Src->getArgumentList().begin(),
+ E = Src->getArgumentList().end(); I != E; ++I) {
+ const MethodArgument *SMA = *I;
+
+ // Create the new method argument and add to the dest method...
+ MethodArgument *DMA = new MethodArgument(SMA->getType(), SMA->getName());
+ Dest->getArgumentList().push_back(DMA);
+
+ // Add a mapping to our local map
+ LocalMap.insert(make_pair(SMA, DMA));
+ }
+
+ // Loop over all of the basic blocks, copying the instructions over...
+ //
+ for (Method::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) {
+ const BasicBlock *SBB = *I;
+
+ // 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));
+
+ // 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 = SBB->begin(), IE = SBB->end();
+ II != IE; ++II) {
+ const Instruction *SI = *II;
+ Instruction *DI = SI->clone();
+ DBB->getInstList().push_back(DI);
+ LocalMap.insert(make_pair(SI, DI));
+ }
+ }
+
+ // At this point, all of the instructions and values of the method are now
+ // copied over. The only problem is that they are still referencing values
+ // in the Source method as operands. Loop through all of the operands of the
+ // methods and patch them up to point to the local versions...
+ //
+ for (Method::inst_iterator I = Dest->inst_begin(), E = Dest->inst_end();
+ I != E; ++I) {
+ Instruction *Inst = *I;
+
+ for (Instruction::op_iterator OI = Inst->op_begin(), OE = Inst->op_end();
+ OI != OE; ++OI)
+ *OI = RemapOperand(*OI, LocalMap, &GlobalMap);
+ }
+
+ return false;
+}
+
+
+// LinkMethodBodies - Link in the method bodies that are defined in the source
+// module into the DestModule. This consists basically of copying the method
+// over and fixing up references to values.
+//
+static bool LinkMethodBodies(Module *Dest, const Module *Src,
+ map<const Value*, Value*> &ValueMap,
+ string *Err = 0) {
+
+ // 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
+
+ assert(DM && DM->isExternal() && "LinkMethodProtos failed!");
+ if (!SM->isExternal()) // External methods are already done
+ if (LinkMethodBody(DM, SM, 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.
+// 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 = 0) {
+ // 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...
+ if (LinkGlobals(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
+ // global values that may be referenced are available in our ValueMap.
+ //
+ if (LinkMethodProtos(Dest, Src, ValueMap, ErrorMsg)) return true;
+
+ // Link in the method bodies that are defined in the source module into the
+ // DestModule. This consists basically of copying the method over and fixing
+ // up references to values.
+ //
+ if (LinkMethodBodies(Dest, Src, ValueMap, ErrorMsg)) return true;
return false;
}
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/Linker.h"
+#include "llvm/Module.h"
+#include "llvm/Method.h"
+#include "llvm/GlobalVariable.h"
+#include "llvm/SymbolTable.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/iOther.h"
+
+// 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;
+}
+
+#include "llvm/Assembly/Writer.h" // TODO: REMOVE
+
+// 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,
+ 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;
+ }
+
+ if (!isa<ConstPoolVal>(In))
+ cerr << "Couldn't remap value: " << In << endl;
+ return In;
+}
+
+
+// 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 *GV = *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()))) {
+ // 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())
+ return Error(Err, "Global Variable Collision on '" +
+ GV->getType()->getDescription() + "':%" + GV->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));
+ } 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());
+
+ // Add the new global to the dest module
+ Dest->getGlobalList().push_back(NGV);
+
+ // Make sure to remember this mapping...
+ ValueMap.insert(make_pair(GV, NGV));
+ }
+ }
+ return false;
+}
+
+
+
+// LinkMethodProtos - Link the methods together between the two modules, without
+// doing method bodies... this just adds external method prototypes to the Dest
+// method...
+//
+static bool LinkMethodProtos(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 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; // SrcMethod
+ Value *V;
+
+ // 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()))) {
+ // 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.
+ //
+ Method *DM = cast<Method>(V); // DestMethod
+
+ // Check to make sure the method is not defined in both modules...
+ if (!SM->isExternal() && !DM->isExternal())
+ return Error(Err, "Method '" +
+ SM->getMethodType()->getDescription() + "':\"" +
+ SM->getName() + "\" - Method is already defined!");
+
+ // Otherwise, just remember this mapping...
+ ValueMap.insert(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());
+
+ // Add the method signature to the dest module...
+ Dest->getMethodList().push_back(DM);
+
+ // ... and remember this mapping...
+ ValueMap.insert(make_pair(SM, DM));
+ }
+ }
+ return false;
+}
+
+// LinkMethodBody - Copy the source method over into the dest method and fix up
+// references to values. At this point we know that Dest is an external method,
+// and that Src is not.
+//
+static bool LinkMethodBody(Method *Dest, const Method *Src,
+ const map<const Value*, Value*> &GlobalMap,
+ string *Err = 0) {
+ assert(Src && Dest && Dest->isExternal() && !Src->isExternal());
+ map<const Value*, Value*> LocalMap; // Map for method local values
+
+ // Go through and convert method arguments over...
+ for (Method::ArgumentListType::const_iterator
+ I = Src->getArgumentList().begin(),
+ E = Src->getArgumentList().end(); I != E; ++I) {
+ const MethodArgument *SMA = *I;
+
+ // Create the new method argument and add to the dest method...
+ MethodArgument *DMA = new MethodArgument(SMA->getType(), SMA->getName());
+ Dest->getArgumentList().push_back(DMA);
+
+ // Add a mapping to our local map
+ LocalMap.insert(make_pair(SMA, DMA));
+ }
+
+ // Loop over all of the basic blocks, copying the instructions over...
+ //
+ for (Method::const_iterator I = Src->begin(), E = Src->end(); I != E; ++I) {
+ const BasicBlock *SBB = *I;
+
+ // 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));
+
+ // 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 = SBB->begin(), IE = SBB->end();
+ II != IE; ++II) {
+ const Instruction *SI = *II;
+ Instruction *DI = SI->clone();
+ DBB->getInstList().push_back(DI);
+ LocalMap.insert(make_pair(SI, DI));
+ }
+ }
+
+ // At this point, all of the instructions and values of the method are now
+ // copied over. The only problem is that they are still referencing values
+ // in the Source method as operands. Loop through all of the operands of the
+ // methods and patch them up to point to the local versions...
+ //
+ for (Method::inst_iterator I = Dest->inst_begin(), E = Dest->inst_end();
+ I != E; ++I) {
+ Instruction *Inst = *I;
+
+ for (Instruction::op_iterator OI = Inst->op_begin(), OE = Inst->op_end();
+ OI != OE; ++OI)
+ *OI = RemapOperand(*OI, LocalMap, &GlobalMap);
+ }
+
+ return false;
+}
+
+
+// LinkMethodBodies - Link in the method bodies that are defined in the source
+// module into the DestModule. This consists basically of copying the method
+// over and fixing up references to values.
+//
+static bool LinkMethodBodies(Module *Dest, const Module *Src,
+ map<const Value*, Value*> &ValueMap,
+ string *Err = 0) {
+
+ // 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
+
+ assert(DM && DM->isExternal() && "LinkMethodProtos failed!");
+ if (!SM->isExternal()) // External methods are already done
+ if (LinkMethodBody(DM, SM, 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.
+// 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 = 0) {
+ // 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...
+ if (LinkGlobals(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
+ // global values that may be referenced are available in our ValueMap.
+ //
+ if (LinkMethodProtos(Dest, Src, ValueMap, ErrorMsg)) return true;
+
+ // Link in the method bodies that are defined in the source module into the
+ // DestModule. This consists basically of copying the method over and fixing
+ // up references to values.
+ //
+ if (LinkMethodBodies(Dest, Src, ValueMap, ErrorMsg)) return true;
return false;
}
projects / oota-llvm.git / commitdiff