1 //===-- llvm/Function.h - Class to represent a single function --*- 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 declaration of the Function class, which represents a
11 // single function/procedure in LLVM.
13 // A function basically consists of a list of basic blocks, a list of arguments,
14 // and a symbol table.
16 //===----------------------------------------------------------------------===//
18 #ifndef LLVM_FUNCTION_H
19 #define LLVM_FUNCTION_H
21 #include "llvm/GlobalValue.h"
22 #include "llvm/BasicBlock.h"
23 #include "llvm/Argument.h"
24 #include "llvm/Support/Annotation.h"
31 // Traits for intrusive list of instructions...
32 template<> struct ilist_traits<BasicBlock>
33 : public SymbolTableListTraits<BasicBlock, Function> {
35 // createSentinel is used to create a node that marks the end of the list...
36 static BasicBlock *createSentinel();
37 static void destroySentinel(BasicBlock *BB) { delete BB; }
38 static iplist<BasicBlock> &getList(Function *F);
39 static ValueSymbolTable *getSymTab(Function *ItemParent);
42 template<> struct ilist_traits<Argument>
43 : public SymbolTableListTraits<Argument, Function> {
45 // createSentinel is used to create a node that marks the end of the list...
46 static Argument *createSentinel();
47 static void destroySentinel(Argument *A) { delete A; }
48 static iplist<Argument> &getList(Function *F);
49 static ValueSymbolTable *getSymTab(Function *ItemParent);
52 class Function : public GlobalValue, public Annotable {
54 typedef iplist<Argument> ArgumentListType;
55 typedef iplist<BasicBlock> BasicBlockListType;
57 // BasicBlock iterators...
58 typedef BasicBlockListType::iterator iterator;
59 typedef BasicBlockListType::const_iterator const_iterator;
61 typedef ArgumentListType::iterator arg_iterator;
62 typedef ArgumentListType::const_iterator const_arg_iterator;
65 // Important things that make up a function!
66 BasicBlockListType BasicBlocks; ///< The basic blocks
67 ArgumentListType ArgumentList; ///< The formal arguments
68 ValueSymbolTable *SymTab; ///< Symbol table of args/instructions
69 ParamAttrsList *ParamAttrs; ///< Parameter attributes
70 unsigned CallingConvention; ///< Calling convention to use
72 friend class SymbolTableListTraits<Function, Module>;
74 void setParent(Module *parent);
75 Function *Prev, *Next;
76 void setNext(Function *N) { Next = N; }
77 void setPrev(Function *N) { Prev = N; }
80 /// Function ctor - If the (optional) Module argument is specified, the
81 /// function is automatically inserted into the end of the function list for
84 Function(const FunctionType *Ty, LinkageTypes Linkage,
85 const std::string &N = "", Module *M = 0);
88 const Type *getReturnType() const; // Return the type of the ret val
89 const FunctionType *getFunctionType() const; // Return the FunctionType for me
91 /// isVarArg - Return true if this function takes a variable number of
93 bool isVarArg() const;
95 /// isDeclaration - Is the body of this function unknown? (The basic block
96 /// list is empty if so.) This is true for function declarations, but not
97 /// true for function definitions.
99 virtual bool isDeclaration() const { return BasicBlocks.empty(); }
101 /// getIntrinsicID - This method returns the ID number of the specified
102 /// function, or Intrinsic::not_intrinsic if the function is not an
103 /// instrinsic, or if the pointer is null. This value is always defined to be
104 /// zero to allow easy checking for whether a function is intrinsic or not.
105 /// The particular intrinsic functions which correspond to this value are
106 /// defined in llvm/Intrinsics.h.
108 unsigned getIntrinsicID(bool noAssert = false) const;
109 bool isIntrinsic() const { return getIntrinsicID() != 0; }
111 /// getCallingConv()/setCallingConv(uint) - These method get and set the
112 /// calling convention of this function. The enum values for the known
113 /// calling conventions are defined in CallingConv.h.
114 unsigned getCallingConv() const { return CallingConvention; }
115 void setCallingConv(unsigned CC) { CallingConvention = CC; }
117 /// Obtains a constant pointer to the ParamAttrsList object which holds the
118 /// parameter attributes information, if any.
119 /// @returns 0 if no parameter attributes have been set.
120 /// @brief Get the parameter attributes.
121 const ParamAttrsList *getParamAttrs() const { return ParamAttrs; }
123 /// Sets the parameter attributes for this Function. To construct a
124 /// ParamAttrsList, see ParameterAttributes.h
125 /// @brief Set the parameter attributes.
126 void setParamAttrs(ParamAttrsList *attrs) { ParamAttrs = attrs; }
128 /// deleteBody - This method deletes the body of the function, and converts
129 /// the linkage to external.
133 setLinkage(ExternalLinkage);
136 /// removeFromParent - This method unlinks 'this' from the containing module,
137 /// but does not delete it.
139 void removeFromParent();
141 /// eraseFromParent - This method unlinks 'this' from the containing module
144 void eraseFromParent();
147 // getNext/Prev - Return the next or previous function in the list. These
148 // methods should never be used directly, and are only used to implement the
149 // function list as part of the module.
151 Function *getNext() { return Next; }
152 const Function *getNext() const { return Next; }
153 Function *getPrev() { return Prev; }
154 const Function *getPrev() const { return Prev; }
156 /// Get the underlying elements of the Function... the basic block list is
157 /// empty for external functions.
159 const ArgumentListType &getArgumentList() const { return ArgumentList; }
160 ArgumentListType &getArgumentList() { return ArgumentList; }
162 const BasicBlockListType &getBasicBlockList() const { return BasicBlocks; }
163 BasicBlockListType &getBasicBlockList() { return BasicBlocks; }
165 const BasicBlock &getEntryBlock() const { return front(); }
166 BasicBlock &getEntryBlock() { return front(); }
168 //===--------------------------------------------------------------------===//
169 // Symbol Table Accessing functions...
171 /// getSymbolTable() - Return the symbol table...
173 inline ValueSymbolTable &getValueSymbolTable() { return *SymTab; }
174 inline const ValueSymbolTable &getValueSymbolTable() const { return *SymTab; }
177 //===--------------------------------------------------------------------===//
178 // BasicBlock iterator forwarding functions
180 iterator begin() { return BasicBlocks.begin(); }
181 const_iterator begin() const { return BasicBlocks.begin(); }
182 iterator end () { return BasicBlocks.end(); }
183 const_iterator end () const { return BasicBlocks.end(); }
185 size_t size() const { return BasicBlocks.size(); }
186 bool empty() const { return BasicBlocks.empty(); }
187 const BasicBlock &front() const { return BasicBlocks.front(); }
188 BasicBlock &front() { return BasicBlocks.front(); }
189 const BasicBlock &back() const { return BasicBlocks.back(); }
190 BasicBlock &back() { return BasicBlocks.back(); }
192 //===--------------------------------------------------------------------===//
193 // Argument iterator forwarding functions
195 arg_iterator arg_begin() { return ArgumentList.begin(); }
196 const_arg_iterator arg_begin() const { return ArgumentList.begin(); }
197 arg_iterator arg_end () { return ArgumentList.end(); }
198 const_arg_iterator arg_end () const { return ArgumentList.end(); }
200 size_t arg_size () const { return ArgumentList.size(); }
201 bool arg_empty() const { return ArgumentList.empty(); }
203 virtual void print(std::ostream &OS) const { print(OS, 0); }
204 void print(std::ostream *OS) const { if (OS) print(*OS); }
205 void print(std::ostream &OS, AssemblyAnnotationWriter *AAW) const;
207 /// viewCFG - This function is meant for use from the debugger. You can just
208 /// say 'call F->viewCFG()' and a ghostview window should pop up from the
209 /// program, displaying the CFG of the current function with the code for each
210 /// basic block inside. This depends on there being a 'dot' and 'gv' program
213 void viewCFG() const;
215 /// viewCFGOnly - This function is meant for use from the debugger. It works
216 /// just like viewCFG, but it does not include the contents of basic blocks
217 /// into the nodes, just the label. If you are only interested in the CFG
218 /// this can make the graph smaller.
220 void viewCFGOnly() const;
222 /// Methods for support type inquiry through isa, cast, and dyn_cast:
223 static inline bool classof(const Function *) { return true; }
224 static inline bool classof(const Value *V) {
225 return V->getValueID() == Value::FunctionVal;
228 /// dropAllReferences() - This method causes all the subinstructions to "let
229 /// go" of all references that they are maintaining. This allows one to
230 /// 'delete' a whole module at a time, even though there may be circular
231 /// references... first all references are dropped, and all use counts go to
232 /// zero. Then everything is deleted for real. Note that no operations are
233 /// valid on an object that has "dropped all references", except operator
236 /// Since no other object in the module can have references into the body of a
237 /// function, dropping all references deletes the entire body of the function,
238 /// including any contained basic blocks.
240 void dropAllReferences();
243 inline ValueSymbolTable *
244 ilist_traits<BasicBlock>::getSymTab(Function *F) {
245 return F ? &F->getValueSymbolTable() : 0;
248 inline ValueSymbolTable *
249 ilist_traits<Argument>::getSymTab(Function *F) {
250 return F ? &F->getValueSymbolTable() : 0;
253 } // End llvm namespace