1 //===-- llvm/Method.h - Class to represent a single VM method ----*- C++ -*--=//
3 // This file contains the declaration of the Method class, which represents a
4 // single Method/function/procedure in the VM.
6 // Note that basic blocks themselves are Def's, because they are referenced
7 // by instructions like calls and can go in virtual function tables and stuff.
9 //===----------------------------------------------------------------------===//
14 #include "llvm/SymTabValue.h"
15 #include "llvm/BasicBlock.h"
24 class Method : public Value, public SymTabValue {
26 typedef ValueHolder<MethodArgument, Method, Method> ArgumentListType;
27 typedef ValueHolder<BasicBlock , Method, Method> BasicBlocksType;
29 // BasicBlock iterators...
30 typedef BasicBlocksType::iterator iterator;
31 typedef BasicBlocksType::const_iterator const_iterator;
32 typedef reverse_iterator<const_iterator> const_reverse_iterator;
33 typedef reverse_iterator<iterator> reverse_iterator;
37 // Important things that make up a method!
38 BasicBlocksType BasicBlocks; // The basic blocks
39 ArgumentListType ArgumentList; // The formal arguments
41 Module *Parent; // The module that contains this method
43 friend class ValueHolder<Method,Module, Module>;
44 void setParent(Module *parent);
47 Method(const MethodType *Ty, const string &Name = "");
50 // Specialize setName to handle symbol table majik...
51 virtual void setName(const string &name);
53 const Type *getReturnType() const;
54 const MethodType *getMethodType() const;
56 // Is the body of this method unknown? (the basic block list is empty if so)
57 // this is true for external methods, defined as forward "declare"ations
58 bool isExternal() const { return BasicBlocks.empty(); }
61 // Get the class structure that this method is contained inside of...
62 inline Module *getParent() { return Parent; }
63 inline const Module *getParent() const { return Parent; }
65 // Get the underlying elements of the Method...
66 inline const ArgumentListType &getArgumentList() const{ return ArgumentList; }
67 inline ArgumentListType &getArgumentList() { return ArgumentList; }
69 inline const BasicBlocksType &getBasicBlocks() const { return BasicBlocks; }
70 inline BasicBlocksType &getBasicBlocks() { return BasicBlocks; }
73 //===--------------------------------------------------------------------===//
74 // BasicBlock iterator forwarding functions
76 inline iterator begin() { return BasicBlocks.begin(); }
77 inline const_iterator begin() const { return BasicBlocks.begin(); }
78 inline iterator end () { return BasicBlocks.end(); }
79 inline const_iterator end () const { return BasicBlocks.end(); }
81 inline reverse_iterator rbegin() { return BasicBlocks.rbegin(); }
82 inline const_reverse_iterator rbegin() const { return BasicBlocks.rbegin(); }
83 inline reverse_iterator rend () { return BasicBlocks.rend(); }
84 inline const_reverse_iterator rend () const { return BasicBlocks.rend(); }
86 inline unsigned size() const { return BasicBlocks.size(); }
87 inline bool empty() const { return BasicBlocks.empty(); }
88 inline const BasicBlock *front() const { return BasicBlocks.front(); }
89 inline BasicBlock *front() { return BasicBlocks.front(); }
90 inline const BasicBlock *back() const { return BasicBlocks.back(); }
91 inline BasicBlock *back() { return BasicBlocks.back(); }
95 // dropAllReferences() - This function causes all the subinstructions to "let
96 // go" of all references that they are maintaining. This allows one to
97 // 'delete' a whole class at a time, even though there may be circular
98 // references... first all references are dropped, and all use counts go to
99 // zero. Then everything is delete'd for real. Note that no operations are
100 // valid on an object that has "dropped all references", except operator
103 void dropAllReferences();
105 //===--------------------------------------------------------------------===//
106 // Method Instruction iterator code
107 //===--------------------------------------------------------------------===//
109 template <class _BB_t, class _BB_i_t, class _BI_t, class _II_t>
111 typedef InstIterator<BasicBlocksType, iterator,
112 BasicBlock::iterator, Instruction*> inst_iterator;
113 typedef InstIterator<const BasicBlocksType, const_iterator,
114 BasicBlock::const_iterator,
115 const Instruction*> inst_const_iterator;
117 // This inner class is used to implement inst_begin() & inst_end() for
118 // inst_iterator and inst_const_iterator's.
120 template <class _BB_t, class _BB_i_t, class _BI_t, class _II_t>
123 typedef _BB_i_t BBIty;
126 _BB_t &BBs; // BasicBlocksType
127 _BB_i_t BB; // BasicBlocksType::iterator
128 _BI_t BI; // BasicBlock::iterator
130 typedef bidirectional_iterator_tag iterator_category;
132 template<class M> InstIterator(M &m)
133 : BBs(m.getBasicBlocks()), BB(BBs.begin()) { // begin ctor
134 if (BB != BBs.end()) {
136 resyncInstructionIterator();
140 template<class M> InstIterator(M &m, bool)
141 : BBs(m.getBasicBlocks()), BB(BBs.end()) { // end ctor
144 // Accessors to get at the underlying iterators...
145 inline BBIty &getBasicBlockIterator() { return BB; }
146 inline BIty &getInstructionIterator() { return BI; }
148 inline IIty operator*() const { return *BI; }
149 inline IIty *operator->() const { return &(operator*()); }
151 inline bool operator==(const InstIterator &y) const {
152 return BB == y.BB && (BI == y.BI || BB == BBs.end());
154 inline bool operator!=(const InstIterator& y) const {
155 return !operator==(y);
158 // resyncInstructionIterator - This should be called if the
159 // InstructionIterator is modified outside of our control. This resynchs
160 // the internals of the InstIterator to a consistent state.
162 inline void resyncInstructionIterator() {
163 // The only way that the II could be broken is if it is now pointing to
164 // the end() of the current BasicBlock and there are successor BBs.
165 while (BI == (*BB)->end()) {
167 if (BB == BBs.end()) break;
172 InstIterator& operator++() {
174 resyncInstructionIterator(); // Make sure it is still valid.
177 inline InstIterator operator++(int) {
178 InstIterator tmp = *this; ++*this; return tmp;
181 InstIterator& operator--() {
182 while (BB == BBs.end() || BI == (*BB)->begin()) {
189 inline InstIterator operator--(int) {
190 InstIterator tmp = *this; --*this; return tmp;
194 inline inst_iterator inst_begin() { return inst_iterator(*this); }
195 inline inst_iterator inst_end() { return inst_iterator(*this, true); }
196 inline inst_const_iterator inst_begin() const { return inst_const_iterator(*this); }
197 inline inst_const_iterator inst_end() const { return inst_const_iterator(*this, true); }