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/GlobalValue.h"
16 #include "llvm/ValueHolder.h"
24 class Method : public GlobalValue, 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 std::reverse_iterator<const_iterator> const_reverse_iterator;
33 typedef std::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 friend class ValueHolder<Method, Module, Module>;
42 void setParent(Module *parent);
45 Method(const MethodType *Ty, bool isInternal, const std::string &Name = "");
48 // Specialize setName to handle symbol table majik...
49 virtual void setName(const std::string &name, SymbolTable *ST = 0);
51 const Type *getReturnType() const; // Return the return type of method
52 const MethodType *getMethodType() const; // Return the MethodType for me
54 // Is the body of this method unknown? (the basic block list is empty if so)
55 // this is true for external methods, defined as forward "declare"ations
56 bool isExternal() const { return BasicBlocks.empty(); }
58 // Get the underlying elements of the Method... both the argument list and
59 // basic block list are empty for external methods.
61 inline const ArgumentListType &getArgumentList() const{ return ArgumentList; }
62 inline ArgumentListType &getArgumentList() { return ArgumentList; }
64 inline const BasicBlocksType &getBasicBlocks() const { return BasicBlocks; }
65 inline BasicBlocksType &getBasicBlocks() { return BasicBlocks; }
67 inline const BasicBlock *getEntryNode() const { return front(); }
68 inline BasicBlock *getEntryNode() { return front(); }
70 //===--------------------------------------------------------------------===//
71 // BasicBlock iterator forwarding functions
73 inline iterator begin() { return BasicBlocks.begin(); }
74 inline const_iterator begin() const { return BasicBlocks.begin(); }
75 inline iterator end () { return BasicBlocks.end(); }
76 inline const_iterator end () const { return BasicBlocks.end(); }
78 inline reverse_iterator rbegin() { return BasicBlocks.rbegin(); }
79 inline const_reverse_iterator rbegin() const { return BasicBlocks.rbegin(); }
80 inline reverse_iterator rend () { return BasicBlocks.rend(); }
81 inline const_reverse_iterator rend () const { return BasicBlocks.rend(); }
83 inline unsigned size() const { return BasicBlocks.size(); }
84 inline bool empty() const { return BasicBlocks.empty(); }
85 inline const BasicBlock *front() const { return BasicBlocks.front(); }
86 inline BasicBlock *front() { return BasicBlocks.front(); }
87 inline const BasicBlock *back() const { return BasicBlocks.back(); }
88 inline BasicBlock *back() { return BasicBlocks.back(); }
91 // Methods for support type inquiry through isa, cast, and dyn_cast:
92 static inline bool classof(const Method *T) { return true; }
93 static inline bool classof(const Value *V) {
94 return V->getValueType() == Value::MethodVal;
97 // dropAllReferences() - This function causes all the subinstructions to "let
98 // go" of all references that they are maintaining. This allows one to
99 // 'delete' a whole class at a time, even though there may be circular
100 // references... first all references are dropped, and all use counts go to
101 // zero. Then everything is delete'd for real. Note that no operations are
102 // valid on an object that has "dropped all references", except operator
105 void dropAllReferences();
108 typedef Method Function;