1 //===-- llvm/Module.h - C++ class to represent a VM module ------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the declarations for the Module class that is used to
11 // maintain all the information related to a VM module.
13 // A module also maintains a GlobalValRefMap object that is used to hold all
14 // constant references to global variables in the module. When a global
15 // variable is destroyed, it should have no entries in the GlobalValueRefMap.
17 //===----------------------------------------------------------------------===//
22 #include "llvm/Function.h"
23 #include "llvm/GlobalVariable.h"
28 class GlobalValueRefMap; // Used by ConstantVals.cpp
29 class ConstantPointerRef;
33 template<> struct ilist_traits<Function>
34 : public SymbolTableListTraits<Function, Module, Module> {
35 // createNode is used to create a node that marks the end of the list...
36 static Function *createNode();
37 static iplist<Function> &getList(Module *M);
39 template<> struct ilist_traits<GlobalVariable>
40 : public SymbolTableListTraits<GlobalVariable, Module, Module> {
41 // createNode is used to create a node that marks the end of the list...
42 static GlobalVariable *createNode();
43 static iplist<GlobalVariable> &getList(Module *M);
47 typedef iplist<GlobalVariable> GlobalListType;
48 typedef iplist<Function> FunctionListType;
50 // Global Variable iterators...
51 typedef GlobalListType::iterator giterator;
52 typedef GlobalListType::const_iterator const_giterator;
53 typedef std::reverse_iterator<giterator> reverse_giterator;
54 typedef std::reverse_iterator<const_giterator> const_reverse_giterator;
56 // Function iterators...
57 typedef FunctionListType::iterator iterator;
58 typedef FunctionListType::const_iterator const_iterator;
59 typedef std::reverse_iterator<iterator> reverse_iterator;
60 typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
62 enum Endianness { AnyEndianness, LittleEndian, BigEndian };
63 enum PointerSize { AnyPointerSize, Pointer32, Pointer64 };
66 GlobalListType GlobalList; // The Global Variables in the module
67 FunctionListType FunctionList; // The Functions in the module
68 GlobalValueRefMap *GVRefMap; // Keep track of GlobalValueRef's
69 SymbolTable *SymTab; // Symbol Table for the module
70 std::string ModuleID; // Human readable identifier for the module
72 // These flags are probably not the right long-term way to handle this kind of
73 // target information, but it is sufficient for now.
74 Endianness Endian; // True if target is little endian
75 PointerSize PtrSize; // True if target has 32-bit pointers (false = 64-bit)
77 // Accessor for the underlying GVRefMap... only through the Constant class...
78 friend class Constant;
79 friend class ConstantPointerRef;
80 void mutateConstantPointerRef(GlobalValue *OldGV, GlobalValue *NewGV);
81 ConstantPointerRef *getConstantPointerRef(GlobalValue *GV);
82 void destroyConstantPointerRef(ConstantPointerRef *CPR);
85 Module(const std::string &ModuleID);
88 const std::string &getModuleIdentifier() const { return ModuleID; }
90 /// Target endian information...
91 Endianness getEndianness() const { return Endian; }
92 void setEndianness(Endianness E) { Endian = E; }
94 /// Target Pointer Size information...
95 PointerSize getPointerSize() const { return PtrSize; }
96 void setPointerSize(PointerSize PS) { PtrSize = PS; }
98 //===--------------------------------------------------------------------===//
99 // Methods for easy access to the functions in the module.
102 /// getOrInsertFunction - Look up the specified function in the module symbol
103 /// table. If it does not exist, add a prototype for the function and return
105 Function *getOrInsertFunction(const std::string &Name, const FunctionType *T);
107 /// getOrInsertFunction - Look up the specified function in the module symbol
108 /// table. If it does not exist, add a prototype for the function and return
109 /// it. This version of the method takes a null terminated list of function
110 /// arguments, which makes it easier for clients to use.
111 Function *getOrInsertFunction(const std::string &Name, const Type *RetTy,...);
113 /// getFunction - Look up the specified function in the module symbol table.
114 /// If it does not exist, return null.
116 Function *getFunction(const std::string &Name, const FunctionType *Ty);
118 /// getMainFunction - This function looks up main efficiently. This is such a
119 /// common case, that it is a method in Module. If main cannot be found, a
120 /// null pointer is returned.
122 Function *getMainFunction();
124 /// getNamedFunction - Return the first function in the module with the
125 /// specified name, of arbitrary type. This method returns null if a function
126 /// with the specified name is not found.
128 Function *getNamedFunction(const std::string &Name);
130 //===--------------------------------------------------------------------===//
131 // Methods for easy access to the global variables in the module.
134 /// getGlobalVariable - Look up the specified global variable in the module
135 /// symbol table. If it does not exist, return null. Note that this only
136 /// returns a global variable if it does not have internal linkage. The type
137 /// argument should be the underlying type of the global, ie, it should not
138 /// have the top-level PointerType, which represents the address of the
141 GlobalVariable *getGlobalVariable(const std::string &Name, const Type *Ty);
144 //===--------------------------------------------------------------------===//
145 // Methods for easy access to the types in the module.
148 /// addTypeName - Insert an entry in the symbol table mapping Str to Type. If
149 /// there is already an entry for this name, true is returned and the symbol
150 /// table is not modified.
152 bool addTypeName(const std::string &Name, const Type *Ty);
154 /// getTypeName - If there is at least one entry in the symbol table for the
155 /// specified type, return it.
157 std::string getTypeName(const Type *Ty) const;
159 /// getTypeByName - Return the type with the specified name in this module, or
160 /// null if there is none by that name.
161 const Type *getTypeByName(const std::string &Name) const;
164 //===--------------------------------------------------------------------===//
165 // Methods for direct access to the globals list, functions list, and symbol
169 /// Get the underlying elements of the Module...
170 inline const GlobalListType &getGlobalList() const { return GlobalList; }
171 inline GlobalListType &getGlobalList() { return GlobalList; }
172 inline const FunctionListType &getFunctionList() const { return FunctionList;}
173 inline FunctionListType &getFunctionList() { return FunctionList;}
175 /// getSymbolTable() - Get access to the symbol table for the module, where
176 /// global variables and functions are identified.
178 inline SymbolTable &getSymbolTable() { return *SymTab; }
179 inline const SymbolTable &getSymbolTable() const { return *SymTab; }
182 //===--------------------------------------------------------------------===//
183 // Module iterator forwarding functions
185 inline giterator gbegin() { return GlobalList.begin(); }
186 inline const_giterator gbegin() const { return GlobalList.begin(); }
187 inline giterator gend () { return GlobalList.end(); }
188 inline const_giterator gend () const { return GlobalList.end(); }
190 inline reverse_giterator grbegin() { return GlobalList.rbegin(); }
191 inline const_reverse_giterator grbegin() const { return GlobalList.rbegin(); }
192 inline reverse_giterator grend () { return GlobalList.rend(); }
193 inline const_reverse_giterator grend () const { return GlobalList.rend(); }
195 inline unsigned gsize() const { return GlobalList.size(); }
196 inline bool gempty() const { return GlobalList.empty(); }
197 inline const GlobalVariable &gfront() const { return GlobalList.front(); }
198 inline GlobalVariable &gfront() { return GlobalList.front(); }
199 inline const GlobalVariable &gback() const { return GlobalList.back(); }
200 inline GlobalVariable &gback() { return GlobalList.back(); }
204 inline iterator begin() { return FunctionList.begin(); }
205 inline const_iterator begin() const { return FunctionList.begin(); }
206 inline iterator end () { return FunctionList.end(); }
207 inline const_iterator end () const { return FunctionList.end(); }
209 inline reverse_iterator rbegin() { return FunctionList.rbegin(); }
210 inline const_reverse_iterator rbegin() const { return FunctionList.rbegin(); }
211 inline reverse_iterator rend () { return FunctionList.rend(); }
212 inline const_reverse_iterator rend () const { return FunctionList.rend(); }
214 inline unsigned size() const { return FunctionList.size(); }
215 inline bool empty() const { return FunctionList.empty(); }
216 inline const Function &front() const { return FunctionList.front(); }
217 inline Function &front() { return FunctionList.front(); }
218 inline const Function &back() const { return FunctionList.back(); }
219 inline Function &back() { return FunctionList.back(); }
221 void print(std::ostream &OS) const { print(OS, 0); }
222 void print(std::ostream &OS, AssemblyAnnotationWriter *AAW) const;
226 /// dropAllReferences() - This function causes all the subinstructions to "let
227 /// go" of all references that they are maintaining. This allows one to
228 /// 'delete' a whole class at a time, even though there may be circular
229 /// references... first all references are dropped, and all use counts go to
230 /// zero. Then everything is delete'd for real. Note that no operations are
231 /// valid on an object that has "dropped all references", except operator
234 void dropAllReferences();
237 inline std::ostream &operator<<(std::ostream &O, const Module *M) {
242 inline std::ostream &operator<<(std::ostream &O, const Module &M) {
247 } // End llvm namespace