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 /// @file This file contains the declarations for the Module class.
12 //===----------------------------------------------------------------------===//
17 #include "llvm/Function.h"
18 #include "llvm/GlobalVariable.h"
19 #include "llvm/Support/DataTypes.h"
25 class GlobalValueRefMap; // Used by ConstantVals.cpp
28 template<> struct ilist_traits<Function>
29 : public SymbolTableListTraits<Function, Module> {
30 // createSentinel is used to create a node that marks the end of the list.
31 static Function *createSentinel();
32 static void destroySentinel(Function *F) { delete F; }
33 static iplist<Function> &getList(Module *M);
34 static inline ValueSymbolTable *getSymTab(Module *M);
36 template<> struct ilist_traits<GlobalVariable>
37 : public SymbolTableListTraits<GlobalVariable, Module> {
38 // createSentinel is used to create a node that marks the end of the list.
39 static GlobalVariable *createSentinel();
40 static void destroySentinel(GlobalVariable *GV) { delete GV; }
41 static iplist<GlobalVariable> &getList(Module *M);
42 static inline ValueSymbolTable *getSymTab(Module *M);
45 /// A Module instance is used to store all the information related to an
46 /// LLVM module. Modules are the top level container of all other LLVM
47 /// Intermediate Representation (IR) objects. Each module directly contains a
48 /// list of globals variables, a list of functions, a list of libraries (or
49 /// other modules) this module depends on, a symbol table, and various data
50 /// about the target's characteristics.
52 /// A module maintains a GlobalValRefMap object that is used to hold all
53 /// constant references to global variables in the module. When a global
54 /// variable is destroyed, it should have no entries in the GlobalValueRefMap.
55 /// @brief The main container class for the LLVM Intermediate Representation.
57 /// @name Types And Enumerations
60 /// The type for the list of global variables.
61 typedef iplist<GlobalVariable> GlobalListType;
62 /// The type for the list of functions.
63 typedef iplist<Function> FunctionListType;
65 /// The type for the list of dependent libraries.
66 typedef std::vector<std::string> LibraryListType;
68 /// The Global Variable iterator.
69 typedef GlobalListType::iterator global_iterator;
70 /// The Global Variable constant iterator.
71 typedef GlobalListType::const_iterator const_global_iterator;
73 /// The Function iterators.
74 typedef FunctionListType::iterator iterator;
75 /// The Function constant iterator
76 typedef FunctionListType::const_iterator const_iterator;
78 /// The Library list iterator.
79 typedef LibraryListType::const_iterator lib_iterator;
81 /// An enumeration for describing the endianess of the target machine.
82 enum Endianness { AnyEndianness, LittleEndian, BigEndian };
84 /// An enumeration for describing the size of a pointer on the target machine.
85 enum PointerSize { AnyPointerSize, Pointer32, Pointer64 };
88 /// @name Member Variables
91 GlobalListType GlobalList; ///< The Global Variables in the module
92 FunctionListType FunctionList; ///< The Functions in the module
93 LibraryListType LibraryList; ///< The Libraries needed by the module
94 std::string GlobalScopeAsm; ///< Inline Asm at global scope.
95 ValueSymbolTable *ValSymTab; ///< Symbol table for values
96 TypeSymbolTable *TypeSymTab; ///< Symbol table for types
97 std::string ModuleID; ///< Human readable identifier for the module
98 std::string TargetTriple; ///< Platform target triple Module compiled on
99 std::string DataLayout; ///< Target data description
101 friend class Constant;
104 /// @name Constructors
107 /// The Module constructor. Note that there is no default constructor. You
108 /// must provide a name for the module upon construction.
109 explicit Module(const std::string &ModuleID);
110 /// The module destructor. This will dropAllReferences.
114 /// @name Module Level Accessors
117 /// Get the module identifier which is, essentially, the name of the module.
118 /// @returns the module identifier as a string
119 const std::string &getModuleIdentifier() const { return ModuleID; }
121 /// Get the data layout string for the module's target platform. This encodes
122 /// the type sizes and alignments expected by this module.
123 /// @returns the data layout as a string
124 const std::string& getDataLayout() const { return DataLayout; }
126 /// Get the target triple which is a string describing the target host.
127 /// @returns a string containing the target triple.
128 const std::string &getTargetTriple() const { return TargetTriple; }
130 /// Get the target endian information.
131 /// @returns Endianess - an enumeration for the endianess of the target
132 Endianness getEndianness() const;
134 /// Get the target pointer size.
135 /// @returns PointerSize - an enumeration for the size of the target's pointer
136 PointerSize getPointerSize() const;
138 /// Get any module-scope inline assembly blocks.
139 /// @returns a string containing the module-scope inline assembly blocks.
140 const std::string &getModuleInlineAsm() const { return GlobalScopeAsm; }
142 /// @name Module Level Mutators
146 /// Set the module identifier.
147 void setModuleIdentifier(const std::string &ID) { ModuleID = ID; }
149 /// Set the data layout
150 void setDataLayout(const std::string& DL) { DataLayout = DL; }
152 /// Set the target triple.
153 void setTargetTriple(const std::string &T) { TargetTriple = T; }
155 /// Set the module-scope inline assembly blocks.
156 void setModuleInlineAsm(const std::string &Asm) { GlobalScopeAsm = Asm; }
159 /// @name Function Accessors
162 /// getOrInsertFunction - Look up the specified function in the module symbol
163 /// table. Four possibilities:
164 /// 1. If it does not exist, add a prototype for the function and return it.
165 /// 2. If it exists, and has internal linkage, the existing function is
166 /// renamed and a new one is inserted.
167 /// 3. Otherwise, if the existing function has the correct prototype, return
168 /// the existing function.
169 /// 4. Finally, the function exists but has the wrong prototype: return the
170 /// function with a constantexpr cast to the right prototype.
171 Constant *getOrInsertFunction(const std::string &Name, const FunctionType *T);
173 /// getOrInsertFunction - Look up the specified function in the module symbol
174 /// table. If it does not exist, add a prototype for the function and return
175 /// it. This function guarantees to return a constant of pointer to the
176 /// specified function type or a ConstantExpr BitCast of that type if the
177 /// named /// function has a different type. This version of the method
178 /// takes a null terminated list of function arguments, which makes it
179 /// easier for clients to use.
180 Constant *getOrInsertFunction(const std::string &Name, const Type *RetTy,...)
183 /// getFunction - Look up the specified function in the module symbol table.
184 /// If it does not exist, return null.
185 Function *getFunction(const std::string &Name) const;
188 /// @name Global Variable Accessors
191 /// getGlobalVariable - Look up the specified global variable in the module
192 /// symbol table. If it does not exist, return null. The type argument
193 /// should be the underlying type of the global, i.e., it should not have
194 /// the top-level PointerType, which represents the address of the global.
195 /// If AllowInternal is set to true, this function will return types that
196 /// have InternalLinkage. By default, these types are not returned.
197 GlobalVariable *getGlobalVariable(const std::string &Name,
198 bool AllowInternal = false) const;
200 /// getNamedGlobal - Return the first global variable in the module with the
201 /// specified name, of arbitrary type. This method returns null if a global
202 /// with the specified name is not found.
203 GlobalVariable *getNamedGlobal(const std::string &Name) const {
204 return getGlobalVariable(Name, true);
208 /// @name Type Accessors
211 /// addTypeName - Insert an entry in the symbol table mapping Str to Type. If
212 /// there is already an entry for this name, true is returned and the symbol
213 /// table is not modified.
214 bool addTypeName(const std::string &Name, const Type *Ty);
216 /// getTypeName - If there is at least one entry in the symbol table for the
217 /// specified type, return it.
218 std::string getTypeName(const Type *Ty) const;
220 /// getTypeByName - Return the type with the specified name in this module, or
221 /// null if there is none by that name.
222 const Type *getTypeByName(const std::string &Name) const;
225 /// @name Direct access to the globals list, functions list, and symbol table
228 /// Get the Module's list of global variables (constant).
229 const GlobalListType &getGlobalList() const { return GlobalList; }
230 /// Get the Module's list of global variables.
231 GlobalListType &getGlobalList() { return GlobalList; }
232 /// Get the Module's list of functions (constant).
233 const FunctionListType &getFunctionList() const { return FunctionList; }
234 /// Get the Module's list of functions.
235 FunctionListType &getFunctionList() { return FunctionList; }
236 /// Get the symbol table of global variable and function identifiers
237 const ValueSymbolTable &getValueSymbolTable() const { return *ValSymTab; }
238 /// Get the Module's symbol table of global variable and function identifiers.
239 ValueSymbolTable &getValueSymbolTable() { return *ValSymTab; }
240 /// Get the symbol table of types
241 const TypeSymbolTable &getTypeSymbolTable() const { return *TypeSymTab; }
242 /// Get the Module's symbol table of types
243 TypeSymbolTable &getTypeSymbolTable() { return *TypeSymTab; }
246 /// @name Global Variable Iteration
249 /// Get an iterator to the first global variable
250 global_iterator global_begin() { return GlobalList.begin(); }
251 /// Get a constant iterator to the first global variable
252 const_global_iterator global_begin() const { return GlobalList.begin(); }
253 /// Get an iterator to the last global variable
254 global_iterator global_end () { return GlobalList.end(); }
255 /// Get a constant iterator to the last global variable
256 const_global_iterator global_end () const { return GlobalList.end(); }
257 /// Determine if the list of globals is empty.
258 bool global_empty() const { return GlobalList.empty(); }
261 /// @name Function Iteration
264 /// Get an iterator to the first function.
265 iterator begin() { return FunctionList.begin(); }
266 /// Get a constant iterator to the first function.
267 const_iterator begin() const { return FunctionList.begin(); }
268 /// Get an iterator to the last function.
269 iterator end () { return FunctionList.end(); }
270 /// Get a constant iterator to the last function.
271 const_iterator end () const { return FunctionList.end(); }
272 /// Determine how many functions are in the Module's list of functions.
273 size_t size() const { return FunctionList.size(); }
274 /// Determine if the list of functions is empty.
275 bool empty() const { return FunctionList.empty(); }
278 /// @name Dependent Library Iteration
281 /// @brief Get a constant iterator to beginning of dependent library list.
282 inline lib_iterator lib_begin() const { return LibraryList.begin(); }
283 /// @brief Get a constant iterator to end of dependent library list.
284 inline lib_iterator lib_end() const { return LibraryList.end(); }
285 /// @brief Returns the number of items in the list of libraries.
286 inline size_t lib_size() const { return LibraryList.size(); }
287 /// @brief Add a library to the list of dependent libraries
288 void addLibrary(const std::string& Lib);
289 /// @brief Remove a library from the list of dependent libraries
290 void removeLibrary(const std::string& Lib);
291 /// @brief Get all the libraries
292 inline const LibraryListType& getLibraries() const { return LibraryList; }
295 /// @name Utility functions for printing and dumping Module objects
298 /// Print the module to an output stream
299 void print(std::ostream &OS) const { print(OS, 0); }
300 void print(std::ostream *OS) const { if (OS) print(*OS); }
301 /// Print the module to an output stream with AssemblyAnnotationWriter.
302 void print(std::ostream &OS, AssemblyAnnotationWriter *AAW) const;
303 void print(std::ostream *OS, AssemblyAnnotationWriter *AAW) const {
304 if (OS) print(*OS, AAW);
306 /// Dump the module to std::cerr (for debugging).
308 /// This function causes all the subinstructions to "let go" of all references
309 /// that they are maintaining. This allows one to 'delete' a whole class at
310 /// a time, even though there may be circular references... first all
311 /// references are dropped, and all use counts go to zero. Then everything
312 /// is delete'd for real. Note that no operations are valid on an object
313 /// that has "dropped all references", except operator delete.
314 void dropAllReferences();
318 /// An iostream inserter for modules.
319 inline std::ostream &operator<<(std::ostream &O, const Module &M) {
324 inline ValueSymbolTable *
325 ilist_traits<Function>::getSymTab(Module *M) {
326 return M ? &M->getValueSymbolTable() : 0;
329 inline ValueSymbolTable *
330 ilist_traits<GlobalVariable>::getSymTab(Module *M) {
331 return M ? &M->getValueSymbolTable() : 0;
335 } // End llvm namespace