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);
48 typedef iplist<GlobalVariable> GlobalListType;
49 typedef iplist<Function> FunctionListType;
50 typedef std::vector<std::string> LibraryListType;
52 // Global Variable iterators...
53 typedef GlobalListType::iterator giterator;
54 typedef GlobalListType::const_iterator const_giterator;
55 typedef std::reverse_iterator<giterator> reverse_giterator;
56 typedef std::reverse_iterator<const_giterator> const_reverse_giterator;
58 // Function iterators...
59 typedef FunctionListType::iterator iterator;
60 typedef FunctionListType::const_iterator const_iterator;
61 typedef std::reverse_iterator<iterator> reverse_iterator;
62 typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
64 // Library list iterators
65 typedef LibraryListType::const_iterator lib_iterator;
67 enum Endianness { AnyEndianness, LittleEndian, BigEndian };
68 enum PointerSize { AnyPointerSize, Pointer32, Pointer64 };
71 GlobalListType GlobalList; // The Global Variables in the module
72 FunctionListType FunctionList; // The Functions in the module
73 LibraryListType LibraryList; // The Libraries needed by the module
74 SymbolTable *SymTab; // Symbol Table for the module
75 std::string ModuleID; // Human readable identifier for the module
76 std::string TargetTriple; // Platform target triple Module compiled on
78 // These flags are probably not the right long-term way to handle this kind of
79 // target information, but it is sufficient for now.
80 Endianness Endian; // True if target is little endian
81 PointerSize PtrSize; // True if target has 32-bit pointers (false = 64-bit)
83 // Accessor for the underlying GVRefMap... only through the Constant class...
84 friend class Constant;
85 friend class ConstantPointerRef;
86 ConstantPointerRef *getConstantPointerRef(GlobalValue *GV);
87 void destroyConstantPointerRef(ConstantPointerRef *CPR);
90 Module(const std::string &ModuleID);
93 const std::string& getModuleIdentifier() const { return ModuleID; }
94 const std::string& getTargetTriple() const { return TargetTriple; }
95 void setTargetTriple(const std::string& T) { TargetTriple = T; }
97 /// Target endian information...
98 Endianness getEndianness() const { return Endian; }
99 void setEndianness(Endianness E) { Endian = E; }
101 /// Target Pointer Size information...
102 PointerSize getPointerSize() const { return PtrSize; }
103 void setPointerSize(PointerSize PS) { PtrSize = PS; }
105 //===--------------------------------------------------------------------===//
106 // Methods for easy access to the functions in the module.
109 /// getOrInsertFunction - Look up the specified function in the module symbol
110 /// table. If it does not exist, add a prototype for the function and return
112 Function *getOrInsertFunction(const std::string &Name, const FunctionType *T);
114 /// getOrInsertFunction - Look up the specified function in the module symbol
115 /// table. If it does not exist, add a prototype for the function and return
116 /// it. This version of the method takes a null terminated list of function
117 /// arguments, which makes it easier for clients to use.
118 Function *getOrInsertFunction(const std::string &Name, const Type *RetTy,...);
120 /// getFunction - Look up the specified function in the module symbol table.
121 /// If it does not exist, return null.
123 Function *getFunction(const std::string &Name, const FunctionType *Ty);
125 /// getMainFunction - This function looks up main efficiently. This is such a
126 /// common case, that it is a method in Module. If main cannot be found, a
127 /// null pointer is returned.
129 Function *getMainFunction();
131 /// getNamedFunction - Return the first function in the module with the
132 /// specified name, of arbitrary type. This method returns null if a function
133 /// with the specified name is not found.
135 Function *getNamedFunction(const std::string &Name);
137 //===--------------------------------------------------------------------===//
138 // Methods for easy access to the global variables in the module.
141 /// getGlobalVariable - Look up the specified global variable in the module
142 /// symbol table. If it does not exist, return null. Note that this only
143 /// returns a global variable if it does not have internal linkage. The type
144 /// argument should be the underlying type of the global, ie, it should not
145 /// have the top-level PointerType, which represents the address of the
148 GlobalVariable *getGlobalVariable(const std::string &Name, const Type *Ty);
151 //===--------------------------------------------------------------------===//
152 // Methods for easy access to the types in the module.
155 /// addTypeName - Insert an entry in the symbol table mapping Str to Type. If
156 /// there is already an entry for this name, true is returned and the symbol
157 /// table is not modified.
159 bool addTypeName(const std::string &Name, const Type *Ty);
161 /// getTypeName - If there is at least one entry in the symbol table for the
162 /// specified type, return it.
164 std::string getTypeName(const Type *Ty) const;
166 /// getTypeByName - Return the type with the specified name in this module, or
167 /// null if there is none by that name.
168 const Type *getTypeByName(const std::string &Name) const;
171 //===--------------------------------------------------------------------===//
172 // Methods for direct access to the globals list, functions list, and symbol
176 /// Get the underlying elements of the Module...
177 inline const GlobalListType &getGlobalList() const { return GlobalList; }
178 inline GlobalListType &getGlobalList() { return GlobalList; }
179 inline const FunctionListType &getFunctionList() const { return FunctionList;}
180 inline FunctionListType &getFunctionList() { return FunctionList;}
182 /// getSymbolTable() - Get access to the symbol table for the module, where
183 /// global variables and functions are identified.
185 inline SymbolTable &getSymbolTable() { return *SymTab; }
186 inline const SymbolTable &getSymbolTable() const { return *SymTab; }
189 //===--------------------------------------------------------------------===//
190 // Module iterator forwarding functions
192 // Globals list interface
193 inline giterator gbegin() { return GlobalList.begin(); }
194 inline const_giterator gbegin() const { return GlobalList.begin(); }
195 inline giterator gend () { return GlobalList.end(); }
196 inline const_giterator gend () const { return GlobalList.end(); }
198 inline reverse_giterator grbegin() { return GlobalList.rbegin(); }
199 inline const_reverse_giterator grbegin() const { return GlobalList.rbegin(); }
200 inline reverse_giterator grend () { return GlobalList.rend(); }
201 inline const_reverse_giterator grend () const { return GlobalList.rend(); }
203 inline unsigned gsize() const { return GlobalList.size(); }
204 inline bool gempty() const { return GlobalList.empty(); }
205 inline const GlobalVariable &gfront() const { return GlobalList.front(); }
206 inline GlobalVariable &gfront() { return GlobalList.front(); }
207 inline const GlobalVariable &gback() const { return GlobalList.back(); }
208 inline GlobalVariable &gback() { return GlobalList.back(); }
210 // FunctionList interface
211 inline iterator begin() { return FunctionList.begin(); }
212 inline const_iterator begin() const { return FunctionList.begin(); }
213 inline iterator end () { return FunctionList.end(); }
214 inline const_iterator end () const { return FunctionList.end(); }
216 inline reverse_iterator rbegin() { return FunctionList.rbegin(); }
217 inline const_reverse_iterator rbegin() const { return FunctionList.rbegin(); }
218 inline reverse_iterator rend () { return FunctionList.rend(); }
219 inline const_reverse_iterator rend () const { return FunctionList.rend(); }
221 inline unsigned size() const { return FunctionList.size(); }
222 inline bool empty() const { return FunctionList.empty(); }
223 inline const Function &front() const { return FunctionList.front(); }
224 inline Function &front() { return FunctionList.front(); }
225 inline const Function &back() const { return FunctionList.back(); }
226 inline Function &back() { return FunctionList.back(); }
228 //===--------------------------------------------------------------------===//
229 // List of dependent library access functionsns
231 /// @brief Get a constant iterator to beginning of dependent library list.
232 inline lib_iterator lib_begin() const { return LibraryList.begin(); }
234 /// @brief Get a constant iterator to end of dependent library list.
235 inline lib_iterator lib_end() const { return LibraryList.end(); }
237 /// @brief Returns the number of items in the list of libraries.
238 inline unsigned lib_size() const { return LibraryList.size(); }
240 /// @brief Add a library to the list of dependent libraries
241 inline void addLibrary(const std::string& Lib){ LibraryList.push_back(Lib); }
243 /// @brief Remove a library from the list of dependent libraries
244 inline void removeLibrary(const std::string& Lib);
246 /// @brief Get all the libraries
247 inline const LibraryListType& getLibraries() const { return LibraryList; }
249 void print(std::ostream &OS) const { print(OS, 0); }
250 void print(std::ostream &OS, AssemblyAnnotationWriter *AAW) const;
254 /// dropAllReferences() - This function causes all the subinstructions to "let
255 /// go" of all references that they are maintaining. This allows one to
256 /// 'delete' a whole class at a time, even though there may be circular
257 /// references... first all references are dropped, and all use counts go to
258 /// zero. Then everything is delete'd for real. Note that no operations are
259 /// valid on an object that has "dropped all references", except operator
262 void dropAllReferences();
265 inline std::ostream &operator<<(std::ostream &O, const Module *M) {
270 inline std::ostream &operator<<(std::ostream &O, const Module &M) {
275 } // End llvm namespace