1 //===-- llvm/Module.h - C++ class to represent a VM module ------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
11 /// Module.h This file contains the declarations for the Module class.
13 //===----------------------------------------------------------------------===//
18 #include "llvm/Function.h"
19 #include "llvm/GlobalVariable.h"
20 #include "llvm/GlobalAlias.h"
21 #include "llvm/Support/DataTypes.h"
26 class GlobalValueRefMap; // Used by ConstantVals.cpp
29 template<> struct ilist_traits<Function>
30 : public SymbolTableListTraits<Function, Module> {
31 // createSentinel is used to create a node that marks the end of the list.
32 static Function *createSentinel();
33 static void destroySentinel(Function *F) { delete F; }
34 static iplist<Function> &getList(Module *M);
35 static inline ValueSymbolTable *getSymTab(Module *M);
37 template<> struct ilist_traits<GlobalVariable>
38 : public SymbolTableListTraits<GlobalVariable, Module> {
39 // createSentinel is used to create a node that marks the end of the list.
40 static GlobalVariable *createSentinel();
41 static void destroySentinel(GlobalVariable *GV) { delete GV; }
42 static iplist<GlobalVariable> &getList(Module *M);
43 static inline ValueSymbolTable *getSymTab(Module *M);
45 template<> struct ilist_traits<GlobalAlias>
46 : public SymbolTableListTraits<GlobalAlias, Module> {
47 // createSentinel is used to create a node that marks the end of the list.
48 static GlobalAlias *createSentinel();
49 static void destroySentinel(GlobalAlias *GA) { delete GA; }
50 static iplist<GlobalAlias> &getList(Module *M);
51 static inline ValueSymbolTable *getSymTab(Module *M);
54 /// A Module instance is used to store all the information related to an
55 /// LLVM module. Modules are the top level container of all other LLVM
56 /// Intermediate Representation (IR) objects. Each module directly contains a
57 /// list of globals variables, a list of functions, a list of libraries (or
58 /// other modules) this module depends on, a symbol table, and various data
59 /// about the target's characteristics.
61 /// A module maintains a GlobalValRefMap object that is used to hold all
62 /// constant references to global variables in the module. When a global
63 /// variable is destroyed, it should have no entries in the GlobalValueRefMap.
64 /// @brief The main container class for the LLVM Intermediate Representation.
66 /// @name Types And Enumerations
69 /// The type for the list of global variables.
70 typedef iplist<GlobalVariable> GlobalListType;
71 /// The type for the list of functions.
72 typedef iplist<Function> FunctionListType;
73 /// The type for the list of aliases.
74 typedef iplist<GlobalAlias> AliasListType;
76 /// The type for the list of dependent libraries.
77 typedef std::vector<std::string> LibraryListType;
79 /// The Global Variable iterator.
80 typedef GlobalListType::iterator global_iterator;
81 /// The Global Variable constant iterator.
82 typedef GlobalListType::const_iterator const_global_iterator;
84 /// The Function iterators.
85 typedef FunctionListType::iterator iterator;
86 /// The Function constant iterator
87 typedef FunctionListType::const_iterator const_iterator;
89 /// The Global Alias iterators.
90 typedef AliasListType::iterator alias_iterator;
91 /// The Global Alias constant iterator
92 typedef AliasListType::const_iterator const_alias_iterator;
94 /// The Library list iterator.
95 typedef LibraryListType::const_iterator lib_iterator;
97 /// An enumeration for describing the endianess of the target machine.
98 enum Endianness { AnyEndianness, LittleEndian, BigEndian };
100 /// An enumeration for describing the size of a pointer on the target machine.
101 enum PointerSize { AnyPointerSize, Pointer32, Pointer64 };
104 /// @name Member Variables
107 GlobalListType GlobalList; ///< The Global Variables in the module
108 FunctionListType FunctionList; ///< The Functions in the module
109 AliasListType AliasList; ///< The Aliases in the module
110 LibraryListType LibraryList; ///< The Libraries needed by the module
111 std::string GlobalScopeAsm; ///< Inline Asm at global scope.
112 ValueSymbolTable *ValSymTab; ///< Symbol table for values
113 TypeSymbolTable *TypeSymTab; ///< Symbol table for types
114 std::string ModuleID; ///< Human readable identifier for the module
115 std::string TargetTriple; ///< Platform target triple Module compiled on
116 std::string DataLayout; ///< Target data description
118 friend class Constant;
121 /// @name Constructors
124 /// The Module constructor. Note that there is no default constructor. You
125 /// must provide a name for the module upon construction.
126 explicit Module(const std::string &ModuleID);
127 /// The module destructor. This will dropAllReferences.
131 /// @name Module Level Accessors
134 /// Get the module identifier which is, essentially, the name of the module.
135 /// @returns the module identifier as a string
136 const std::string &getModuleIdentifier() const { return ModuleID; }
138 /// Get the data layout string for the module's target platform. This encodes
139 /// the type sizes and alignments expected by this module.
140 /// @returns the data layout as a string
141 const std::string& getDataLayout() const { return DataLayout; }
143 /// Get the target triple which is a string describing the target host.
144 /// @returns a string containing the target triple.
145 const std::string &getTargetTriple() const { return TargetTriple; }
147 /// Get the target endian information.
148 /// @returns Endianess - an enumeration for the endianess of the target
149 Endianness getEndianness() const;
151 /// Get the target pointer size.
152 /// @returns PointerSize - an enumeration for the size of the target's pointer
153 PointerSize getPointerSize() const;
155 /// Get any module-scope inline assembly blocks.
156 /// @returns a string containing the module-scope inline assembly blocks.
157 const std::string &getModuleInlineAsm() const { return GlobalScopeAsm; }
159 /// @name Module Level Mutators
163 /// Set the module identifier.
164 void setModuleIdentifier(const std::string &ID) { ModuleID = ID; }
166 /// Set the data layout
167 void setDataLayout(const std::string& DL) { DataLayout = DL; }
169 /// Set the target triple.
170 void setTargetTriple(const std::string &T) { TargetTriple = T; }
172 /// Set the module-scope inline assembly blocks.
173 void setModuleInlineAsm(const std::string &Asm) { GlobalScopeAsm = Asm; }
175 /// Append to the module-scope inline assembly blocks, automatically
176 /// appending a newline to the end.
177 void appendModuleInlineAsm(const std::string &Asm) {
178 GlobalScopeAsm += Asm;
179 GlobalScopeAsm += '\n';
183 /// @name Generic Value Accessors
186 /// getNamedValue - Return the first global value in the module with
187 /// the specified name, of arbitrary type. This method returns null
188 /// if a global with the specified name is not found.
189 GlobalValue *getNamedValue(const std::string &Name) const;
190 GlobalValue *getNamedValue(const char *Name) const;
193 /// @name Function Accessors
196 /// getOrInsertFunction - Look up the specified function in the module symbol
197 /// table. Four possibilities:
198 /// 1. If it does not exist, add a prototype for the function and return it.
199 /// 2. If it exists, and has a local linkage, the existing function is
200 /// renamed and a new one is inserted.
201 /// 3. Otherwise, if the existing function has the correct prototype, return
202 /// the existing function.
203 /// 4. Finally, the function exists but has the wrong prototype: return the
204 /// function with a constantexpr cast to the right prototype.
205 Constant *getOrInsertFunction(const std::string &Name, const FunctionType *T,
206 AttrListPtr AttributeList);
208 Constant *getOrInsertFunction(const std::string &Name, const FunctionType *T);
210 /// getOrInsertFunction - Look up the specified function in the module symbol
211 /// table. If it does not exist, add a prototype for the function and return
212 /// it. This function guarantees to return a constant of pointer to the
213 /// specified function type or a ConstantExpr BitCast of that type if the
214 /// named function has a different type. This version of the method takes a
215 /// null terminated list of function arguments, which makes it easier for
217 Constant *getOrInsertFunction(const std::string &Name,
218 AttrListPtr AttributeList,
219 const Type *RetTy, ...) END_WITH_NULL;
221 Constant *getOrInsertFunction(const std::string &Name, const Type *RetTy, ...)
224 Constant *getOrInsertTargetIntrinsic(const std::string &Name,
225 const FunctionType *Ty,
226 AttrListPtr AttributeList);
228 /// getFunction - Look up the specified function in the module symbol table.
229 /// If it does not exist, return null.
230 Function *getFunction(const std::string &Name) const;
231 Function *getFunction(const char *Name) const;
234 /// @name Global Variable Accessors
237 /// getGlobalVariable - Look up the specified global variable in the module
238 /// symbol table. If it does not exist, return null. If AllowInternal is set
239 /// to true, this function will return types that have InternalLinkage. By
240 /// default, these types are not returned.
241 GlobalVariable *getGlobalVariable(const std::string &Name,
242 bool AllowInternal = false) const;
244 /// getNamedGlobal - Return the first global variable in the module with the
245 /// specified name, of arbitrary type. This method returns null if a global
246 /// with the specified name is not found.
247 GlobalVariable *getNamedGlobal(const std::string &Name) const {
248 return getGlobalVariable(Name, true);
251 /// getOrInsertGlobal - Look up the specified global in the module symbol
253 /// 1. If it does not exist, add a declaration of the global and return it.
254 /// 2. Else, the global exists but has the wrong type: return the function
255 /// with a constantexpr cast to the right type.
256 /// 3. Finally, if the existing global is the correct delclaration, return
257 /// the existing global.
258 Constant *getOrInsertGlobal(const std::string &Name, const Type *Ty);
261 /// @name Global Alias Accessors
264 /// getNamedAlias - Return the first global alias in the module with the
265 /// specified name, of arbitrary type. This method returns null if a global
266 /// with the specified name is not found.
267 GlobalAlias *getNamedAlias(const std::string &Name) const;
270 /// @name Type Accessors
273 /// addTypeName - Insert an entry in the symbol table mapping Str to Type. If
274 /// there is already an entry for this name, true is returned and the symbol
275 /// table is not modified.
276 bool addTypeName(const std::string &Name, const Type *Ty);
278 /// getTypeName - If there is at least one entry in the symbol table for the
279 /// specified type, return it.
280 std::string getTypeName(const Type *Ty) const;
282 /// getTypeByName - Return the type with the specified name in this module, or
283 /// null if there is none by that name.
284 const Type *getTypeByName(const std::string &Name) const;
287 /// @name Direct access to the globals list, functions list, and symbol table
290 /// Get the Module's list of global variables (constant).
291 const GlobalListType &getGlobalList() const { return GlobalList; }
292 /// Get the Module's list of global variables.
293 GlobalListType &getGlobalList() { return GlobalList; }
294 static iplist<GlobalVariable> Module::*getSublistAccess(GlobalVariable*) {
295 return &Module::GlobalList;
297 /// Get the Module's list of functions (constant).
298 const FunctionListType &getFunctionList() const { return FunctionList; }
299 /// Get the Module's list of functions.
300 FunctionListType &getFunctionList() { return FunctionList; }
301 static iplist<Function> Module::*getSublistAccess(Function*) {
302 return &Module::FunctionList;
304 /// Get the Module's list of aliases (constant).
305 const AliasListType &getAliasList() const { return AliasList; }
306 /// Get the Module's list of aliases.
307 AliasListType &getAliasList() { return AliasList; }
308 static iplist<GlobalAlias> Module::*getSublistAccess(GlobalAlias*) {
309 return &Module::AliasList;
311 /// Get the symbol table of global variable and function identifiers
312 const ValueSymbolTable &getValueSymbolTable() const { return *ValSymTab; }
313 /// Get the Module's symbol table of global variable and function identifiers.
314 ValueSymbolTable &getValueSymbolTable() { return *ValSymTab; }
315 /// Get the symbol table of types
316 const TypeSymbolTable &getTypeSymbolTable() const { return *TypeSymTab; }
317 /// Get the Module's symbol table of types
318 TypeSymbolTable &getTypeSymbolTable() { return *TypeSymTab; }
321 /// @name Global Variable Iteration
324 /// Get an iterator to the first global variable
325 global_iterator global_begin() { return GlobalList.begin(); }
326 /// Get a constant iterator to the first global variable
327 const_global_iterator global_begin() const { return GlobalList.begin(); }
328 /// Get an iterator to the last global variable
329 global_iterator global_end () { return GlobalList.end(); }
330 /// Get a constant iterator to the last global variable
331 const_global_iterator global_end () const { return GlobalList.end(); }
332 /// Determine if the list of globals is empty.
333 bool global_empty() const { return GlobalList.empty(); }
336 /// @name Function Iteration
339 /// Get an iterator to the first function.
340 iterator begin() { return FunctionList.begin(); }
341 /// Get a constant iterator to the first function.
342 const_iterator begin() const { return FunctionList.begin(); }
343 /// Get an iterator to the last function.
344 iterator end () { return FunctionList.end(); }
345 /// Get a constant iterator to the last function.
346 const_iterator end () const { return FunctionList.end(); }
347 /// Determine how many functions are in the Module's list of functions.
348 size_t size() const { return FunctionList.size(); }
349 /// Determine if the list of functions is empty.
350 bool empty() const { return FunctionList.empty(); }
353 /// @name Dependent Library Iteration
356 /// @brief Get a constant iterator to beginning of dependent library list.
357 inline lib_iterator lib_begin() const { return LibraryList.begin(); }
358 /// @brief Get a constant iterator to end of dependent library list.
359 inline lib_iterator lib_end() const { return LibraryList.end(); }
360 /// @brief Returns the number of items in the list of libraries.
361 inline size_t lib_size() const { return LibraryList.size(); }
362 /// @brief Add a library to the list of dependent libraries
363 void addLibrary(const std::string& Lib);
364 /// @brief Remove a library from the list of dependent libraries
365 void removeLibrary(const std::string& Lib);
366 /// @brief Get all the libraries
367 inline const LibraryListType& getLibraries() const { return LibraryList; }
370 /// @name Alias Iteration
373 /// Get an iterator to the first alias.
374 alias_iterator alias_begin() { return AliasList.begin(); }
375 /// Get a constant iterator to the first alias.
376 const_alias_iterator alias_begin() const { return AliasList.begin(); }
377 /// Get an iterator to the last alias.
378 alias_iterator alias_end () { return AliasList.end(); }
379 /// Get a constant iterator to the last alias.
380 const_alias_iterator alias_end () const { return AliasList.end(); }
381 /// Determine how many functions are in the Module's list of aliases.
382 size_t alias_size () const { return AliasList.size(); }
383 /// Determine if the list of aliases is empty.
384 bool alias_empty() const { return AliasList.empty(); }
387 /// @name Utility functions for printing and dumping Module objects
390 /// Print the module to an output stream with AssemblyAnnotationWriter.
391 void print(raw_ostream &OS, AssemblyAnnotationWriter *AAW) const;
392 void print(std::ostream &OS, AssemblyAnnotationWriter *AAW) const;
394 /// Dump the module to stderr (for debugging).
396 /// This function causes all the subinstructions to "let go" of all references
397 /// that they are maintaining. This allows one to 'delete' a whole class at
398 /// a time, even though there may be circular references... first all
399 /// references are dropped, and all use counts go to zero. Then everything
400 /// is delete'd for real. Note that no operations are valid on an object
401 /// that has "dropped all references", except operator delete.
402 void dropAllReferences();
406 /// An iostream inserter for modules.
407 inline std::ostream &operator<<(std::ostream &O, const Module &M) {
411 inline raw_ostream &operator<<(raw_ostream &O, const Module &M) {
417 inline ValueSymbolTable *
418 ilist_traits<Function>::getSymTab(Module *M) {
419 return M ? &M->getValueSymbolTable() : 0;
422 inline ValueSymbolTable *
423 ilist_traits<GlobalVariable>::getSymTab(Module *M) {
424 return M ? &M->getValueSymbolTable() : 0;
427 inline ValueSymbolTable *
428 ilist_traits<GlobalAlias>::getSymTab(Module *M) {
429 return M ? &M->getValueSymbolTable() : 0;
432 } // End llvm namespace