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);
46 struct Module : public Annotable {
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 /// getOrInsertFunction - Look up the specified function in the module symbol
99 /// table. If it does not exist, add a prototype for the function and return
101 Function *getOrInsertFunction(const std::string &Name, const FunctionType *T);
103 /// getOrInsertFunction - Look up the specified function in the module symbol
104 /// table. If it does not exist, add a prototype for the function and return
105 /// it. This version of the method takes a null terminated list of function
106 /// arguments, which makes it easier for clients to use.
107 Function *getOrInsertFunction(const std::string &Name, const Type *RetTy,...);
109 /// getFunction - Look up the specified function in the module symbol table.
110 /// If it does not exist, return null.
112 Function *getFunction(const std::string &Name, const FunctionType *Ty);
114 /// getMainFunction - This function looks up main efficiently. This is such a
115 /// common case, that it is a method in Module. If main cannot be found, a
116 /// null pointer is returned.
118 Function *getMainFunction();
120 /// getNamedFunction - Return the first function in the module with the
121 /// specified name, of arbitrary type. This method returns null if a function
122 /// with the specified name is not found.
124 Function *getNamedFunction(const std::string &Name);
126 /// addTypeName - Insert an entry in the symbol table mapping Str to Type. If
127 /// there is already an entry for this name, true is returned and the symbol
128 /// table is not modified.
130 bool addTypeName(const std::string &Name, const Type *Ty);
132 /// getTypeName - If there is at least one entry in the symbol table for the
133 /// specified type, return it.
135 std::string getTypeName(const Type *Ty) const;
137 /// getTypeByName - Return the type with the specified name in this module, or
138 /// null if there is none by that name.
139 const Type *getTypeByName(const std::string &Name) const;
141 /// Get the underlying elements of the Module...
142 inline const GlobalListType &getGlobalList() const { return GlobalList; }
143 inline GlobalListType &getGlobalList() { return GlobalList; }
144 inline const FunctionListType &getFunctionList() const { return FunctionList;}
145 inline FunctionListType &getFunctionList() { return FunctionList;}
148 //===--------------------------------------------------------------------===//
149 // Symbol table support functions...
151 /// getSymbolTable() - Get access to the symbol table for the module, where
152 /// global variables and functions are identified.
154 inline SymbolTable &getSymbolTable() { return *SymTab; }
155 inline const SymbolTable &getSymbolTable() const { return *SymTab; }
158 //===--------------------------------------------------------------------===//
159 // Module iterator forwarding functions
161 inline giterator gbegin() { return GlobalList.begin(); }
162 inline const_giterator gbegin() const { return GlobalList.begin(); }
163 inline giterator gend () { return GlobalList.end(); }
164 inline const_giterator gend () const { return GlobalList.end(); }
166 inline reverse_giterator grbegin() { return GlobalList.rbegin(); }
167 inline const_reverse_giterator grbegin() const { return GlobalList.rbegin(); }
168 inline reverse_giterator grend () { return GlobalList.rend(); }
169 inline const_reverse_giterator grend () const { return GlobalList.rend(); }
171 inline unsigned gsize() const { return GlobalList.size(); }
172 inline bool gempty() const { return GlobalList.empty(); }
173 inline const GlobalVariable &gfront() const { return GlobalList.front(); }
174 inline GlobalVariable &gfront() { return GlobalList.front(); }
175 inline const GlobalVariable &gback() const { return GlobalList.back(); }
176 inline GlobalVariable &gback() { return GlobalList.back(); }
180 inline iterator begin() { return FunctionList.begin(); }
181 inline const_iterator begin() const { return FunctionList.begin(); }
182 inline iterator end () { return FunctionList.end(); }
183 inline const_iterator end () const { return FunctionList.end(); }
185 inline reverse_iterator rbegin() { return FunctionList.rbegin(); }
186 inline const_reverse_iterator rbegin() const { return FunctionList.rbegin(); }
187 inline reverse_iterator rend () { return FunctionList.rend(); }
188 inline const_reverse_iterator rend () const { return FunctionList.rend(); }
190 inline unsigned size() const { return FunctionList.size(); }
191 inline bool empty() const { return FunctionList.empty(); }
192 inline const Function &front() const { return FunctionList.front(); }
193 inline Function &front() { return FunctionList.front(); }
194 inline const Function &back() const { return FunctionList.back(); }
195 inline Function &back() { return FunctionList.back(); }
197 void print(std::ostream &OS) const { print(OS, 0); }
198 void print(std::ostream &OS, AssemblyAnnotationWriter *AAW) const;
202 /// dropAllReferences() - This function causes all the subinstructions to "let
203 /// go" of all references that they are maintaining. This allows one to
204 /// 'delete' a whole class at a time, even though there may be circular
205 /// references... first all references are dropped, and all use counts go to
206 /// zero. Then everything is delete'd for real. Note that no operations are
207 /// valid on an object that has "dropped all references", except operator
210 void dropAllReferences();
213 inline std::ostream &operator<<(std::ostream &O, const Module *M) {
218 inline std::ostream &operator<<(std::ostream &O, const Module &M) {
223 } // End llvm namespace