1 //===-- Module.cpp - Implement the Module class ------------------*- C++ -*--=//
3 // This file implements the Module class for the VMCore library.
5 //===----------------------------------------------------------------------===//
7 #include "llvm/Module.h"
8 #include "llvm/Function.h"
9 #include "llvm/GlobalVariable.h"
10 #include "llvm/InstrTypes.h"
11 #include "llvm/ValueHolderImpl.h"
12 #include "llvm/Type.h"
13 #include "llvm/ConstantVals.h"
14 #include "llvm/DerivedTypes.h"
15 #include "Support/STLExtras.h"
18 // Instantiate Templates - This ugliness is the price we have to pay
19 // for having a DefHolderImpl.h file seperate from DefHolder.h! :(
21 template class ValueHolder<GlobalVariable, Module, Module>;
22 template class ValueHolder<Function, Module, Module>;
24 // Define the GlobalValueRefMap as a struct that wraps a map so that we don't
25 // have Module.h depend on <map>
27 struct GlobalValueRefMap : public std::map<GlobalValue*, ConstantPointerRef*>{
32 : Value(Type::VoidTy, Value::ModuleVal, ""), SymTabValue(this),
33 GlobalList(this, this), FunctionList(this, this), GVRefMap(0) {
38 GlobalList.delete_all();
39 GlobalList.setParent(0);
40 FunctionList.delete_all();
41 FunctionList.setParent(0);
44 // getOrInsertFunction - Look up the specified function in the module symbol
45 // table. If it does not exist, add a prototype for the function and return
46 // it. This is nice because it allows most passes to get away with not handling
47 // the symbol table directly for this common task.
49 Function *Module::getOrInsertFunction(const std::string &Name,
50 const FunctionType *Ty) {
51 SymbolTable *SymTab = getSymbolTableSure();
53 // See if we have a definitions for the specified function already...
54 if (Value *V = SymTab->lookup(PointerType::get(Ty), Name)) {
55 return cast<Function>(V); // Yup, got it
56 } else { // Nope, add one
57 Function *New = new Function(Ty, false, Name);
58 FunctionList.push_back(New);
59 return New; // Return the new prototype...
63 // getFunction - Look up the specified function in the module symbol table.
64 // If it does not exist, return null.
66 Function *Module::getFunction(const std::string &Name, const FunctionType *Ty) {
67 SymbolTable *SymTab = getSymbolTable();
68 if (SymTab == 0) return 0; // No symtab, no symbols...
70 return cast_or_null<Function>(SymTab->lookup(PointerType::get(Ty), Name));
75 // dropAllReferences() - This function causes all the subinstructions to "let
76 // go" of all references that they are maintaining. This allows one to
77 // 'delete' a whole class at a time, even though there may be circular
78 // references... first all references are dropped, and all use counts go to
79 // zero. Then everything is delete'd for real. Note that no operations are
80 // valid on an object that has "dropped all references", except operator
83 void Module::dropAllReferences() {
84 for_each(FunctionList.begin(), FunctionList.end(),
85 std::mem_fun(&Function::dropAllReferences));
87 for_each(GlobalList.begin(), GlobalList.end(),
88 std::mem_fun(&GlobalVariable::dropAllReferences));
90 // If there are any GlobalVariable references still out there, nuke them now.
91 // Since all references are hereby dropped, nothing could possibly reference
94 for (GlobalValueRefMap::iterator I = GVRefMap->begin(), E = GVRefMap->end();
96 // Delete the ConstantPointerRef node...
97 I->second->destroyConstant();
100 // Since the table is empty, we can now delete it...
105 // Accessor for the underlying GlobalValRefMap...
106 ConstantPointerRef *Module::getConstantPointerRef(GlobalValue *V){
107 // Create ref map lazily on demand...
108 if (GVRefMap == 0) GVRefMap = new GlobalValueRefMap();
110 GlobalValueRefMap::iterator I = GVRefMap->find(V);
111 if (I != GVRefMap->end()) return I->second;
113 ConstantPointerRef *Ref = new ConstantPointerRef(V);
114 GVRefMap->insert(std::make_pair(V, Ref));
119 void Module::mutateConstantPointerRef(GlobalValue *OldGV, GlobalValue *NewGV) {
120 GlobalValueRefMap::iterator I = GVRefMap->find(OldGV);
121 assert(I != GVRefMap->end() &&
122 "mutateConstantPointerRef; OldGV not in table!");
123 ConstantPointerRef *Ref = I->second;
125 // Remove the old entry...
128 // Insert the new entry...
129 GVRefMap->insert(std::make_pair(NewGV, Ref));