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"
24 #include "llvm/ADT/SetVector.h"
25 #include "llvm/Support/DataTypes.h"
30 class GlobalValueRefMap; // Used by ConstantVals.cpp
34 template<> struct ilist_traits<Function>
35 : public SymbolTableListTraits<Function, Module, Module> {
36 // createSentinel is used to create a node that marks the end of the list.
37 static Function *createSentinel();
38 static void destroySentinel(Function *F) { delete F; }
39 static iplist<Function> &getList(Module *M);
41 template<> struct ilist_traits<GlobalVariable>
42 : public SymbolTableListTraits<GlobalVariable, Module, Module> {
43 // createSentinel is used to create a node that marks the end of the list.
44 static GlobalVariable *createSentinel();
45 static void destroySentinel(GlobalVariable *GV) { delete GV; }
46 static iplist<GlobalVariable> &getList(Module *M);
51 typedef iplist<GlobalVariable> GlobalListType;
52 typedef iplist<Function> FunctionListType;
53 typedef SetVector<std::string> LibraryListType;
55 // Global Variable iterators.
56 typedef GlobalListType::iterator global_iterator;
57 typedef GlobalListType::const_iterator const_global_iterator;
59 // Function iterators.
60 typedef FunctionListType::iterator iterator;
61 typedef FunctionListType::const_iterator const_iterator;
63 // Library list iterators.
64 typedef LibraryListType::const_iterator lib_iterator;
66 enum Endianness { AnyEndianness, LittleEndian, BigEndian };
67 enum PointerSize { AnyPointerSize, Pointer32, Pointer64 };
70 GlobalListType GlobalList; // The Global Variables in the module
71 FunctionListType FunctionList; // The Functions in the module
72 LibraryListType LibraryList; // The Libraries needed by the module
73 SymbolTable *SymTab; // Symbol Table for the module
74 std::string ModuleID; // Human readable identifier for the module
75 std::string TargetTriple; // Platform target triple Module compiled on
77 // These flags are probably not the right long-term way to handle this kind of
78 // target information, but it is sufficient for now.
79 Endianness Endian; // True if target is little endian
80 PointerSize PtrSize; // True if target has 32-bit pointers (false = 64-bit)
82 friend class Constant;
85 Module(const std::string &ModuleID);
88 const std::string &getModuleIdentifier() const { return ModuleID; }
89 void setModuleIdentifier(const std::string &ID) { ModuleID = ID; }
91 const std::string &getTargetTriple() const { return TargetTriple; }
92 void setTargetTriple(const std::string &T) { TargetTriple = T; }
94 /// Target endian information...
95 Endianness getEndianness() const { return Endian; }
96 void setEndianness(Endianness E) { Endian = E; }
98 /// Target Pointer Size information...
99 PointerSize getPointerSize() const { return PtrSize; }
100 void setPointerSize(PointerSize PS) { PtrSize = PS; }
102 //===--------------------------------------------------------------------===//
103 // Methods for easy access to the functions in the module.
106 /// getOrInsertFunction - Look up the specified function in the module symbol
107 /// table. If it does not exist, add a prototype for the function and return
109 Function *getOrInsertFunction(const std::string &Name, const FunctionType *T);
111 /// getOrInsertFunction - Look up the specified function in the module symbol
112 /// table. If it does not exist, add a prototype for the function and return
113 /// it. This version of the method takes a null terminated list of function
114 /// arguments, which makes it easier for clients to use.
115 Function *getOrInsertFunction(const std::string &Name, const Type *RetTy,...)
118 /// getFunction - Look up the specified function in the module symbol table.
119 /// If it does not exist, return null.
121 Function *getFunction(const std::string &Name, const FunctionType *Ty);
123 /// getMainFunction - This function looks up main efficiently. This is such a
124 /// common case, that it is a method in Module. If main cannot be found, a
125 /// null pointer is returned.
127 Function *getMainFunction();
129 /// getNamedFunction - Return the first function in the module with the
130 /// specified name, of arbitrary type. This method returns null if a function
131 /// with the specified name is not found.
133 Function *getNamedFunction(const std::string &Name);
135 //===--------------------------------------------------------------------===//
136 // Methods for easy access to the global variables in the module.
139 /// getGlobalVariable - Look up the specified global variable in the module
140 /// symbol table. If it does not exist, return null. The type argument
141 /// should be the underlying type of the global, i.e., it should not have
142 /// the top-level PointerType, which represents the address of the global.
143 /// If AllowInternal is set to true, this function will return types that
144 /// have InternalLinkage. By default, these types are not returned.
146 GlobalVariable *getGlobalVariable(const std::string &Name, const Type *Ty,
147 bool AllowInternal = false);
150 //===--------------------------------------------------------------------===//
151 // Methods for easy access to the types in the module.
154 /// addTypeName - Insert an entry in the symbol table mapping Str to Type. If
155 /// there is already an entry for this name, true is returned and the symbol
156 /// table is not modified.
158 bool addTypeName(const std::string &Name, const Type *Ty);
160 /// getTypeName - If there is at least one entry in the symbol table for the
161 /// specified type, return it.
163 std::string getTypeName(const Type *Ty) const;
165 /// getTypeByName - Return the type with the specified name in this module, or
166 /// null if there is none by that name.
167 const Type *getTypeByName(const std::string &Name) const;
170 //===--------------------------------------------------------------------===//
171 // Methods for direct access to the globals list, functions list, and symbol
175 /// Get the underlying elements of the Module...
176 inline const GlobalListType &getGlobalList() const { return GlobalList; }
177 inline GlobalListType &getGlobalList() { return GlobalList; }
178 inline const FunctionListType &getFunctionList() const { return FunctionList;}
179 inline FunctionListType &getFunctionList() { return FunctionList;}
181 /// getSymbolTable() - Get access to the symbol table for the module, where
182 /// global variables and functions are identified.
184 inline SymbolTable &getSymbolTable() { return *SymTab; }
185 inline const SymbolTable &getSymbolTable() const { return *SymTab; }
188 //===--------------------------------------------------------------------===//
189 // Module iterator forwarding functions
191 // Globals list interface
192 global_iterator global_begin() { return GlobalList.begin(); }
193 const_global_iterator global_begin() const { return GlobalList.begin(); }
194 global_iterator global_end () { return GlobalList.end(); }
195 const_global_iterator global_end () const { return GlobalList.end(); }
196 bool global_empty() const { return GlobalList.empty(); }
198 // FunctionList interface
199 inline iterator begin() { return FunctionList.begin(); }
200 inline const_iterator begin() const { return FunctionList.begin(); }
201 inline iterator end () { return FunctionList.end(); }
202 inline const_iterator end () const { return FunctionList.end(); }
204 inline size_t size() const { return FunctionList.size(); }
205 inline bool empty() const { return FunctionList.empty(); }
207 //===--------------------------------------------------------------------===//
208 // List of dependent library access functions
210 /// @brief Get a constant iterator to beginning of dependent library list.
211 inline lib_iterator lib_begin() const { return LibraryList.begin(); }
213 /// @brief Get a constant iterator to end of dependent library list.
214 inline lib_iterator lib_end() const { return LibraryList.end(); }
216 /// @brief Returns the number of items in the list of libraries.
217 inline size_t lib_size() const { return LibraryList.size(); }
219 /// @brief Add a library to the list of dependent libraries
220 inline void addLibrary(const std::string& Lib){ LibraryList.insert(Lib); }
222 /// @brief Remove a library from the list of dependent libraries
223 inline void removeLibrary(const std::string& Lib) { LibraryList.remove(Lib); }
225 /// @brief Get all the libraries
226 inline const LibraryListType& getLibraries() const { return LibraryList; }
228 //===--------------------------------------------------------------------===//
229 // Utility functions for printing and dumping Module objects
231 void print(std::ostream &OS) const { print(OS, 0); }
232 void print(std::ostream &OS, AssemblyAnnotationWriter *AAW) const;
236 /// dropAllReferences() - This function causes all the subinstructions to "let
237 /// go" of all references that they are maintaining. This allows one to
238 /// 'delete' a whole class at a time, even though there may be circular
239 /// references... first all references are dropped, and all use counts go to
240 /// zero. Then everything is delete'd for real. Note that no operations are
241 /// valid on an object that has "dropped all references", except operator
244 void dropAllReferences();
247 inline std::ostream &operator<<(std::ostream &O, const Module &M) {
252 } // End llvm namespace