1 //===--- StmtVisitor.h - Visitor for Stmt subclasses ------------*- 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 //===----------------------------------------------------------------------===//
10 // This file defines the StmtVisitor interface.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_CLANG_AST_STMTVISITOR_H
15 #define LLVM_CLANG_AST_STMTVISITOR_H
17 #include "clang/AST/ExprCXX.h"
18 #include "clang/AST/ExprObjC.h"
19 #include "clang/AST/StmtCXX.h"
20 #include "clang/AST/StmtObjC.h"
24 #define DISPATCH(NAME, CLASS) \
25 return static_cast<ImplClass*>(this)->Visit ## NAME(static_cast<CLASS*>(S))
27 /// StmtVisitor - This class implements a simple visitor for Stmt subclasses.
28 /// Since Expr derives from Stmt, this also includes support for visiting Exprs.
29 template<typename ImplClass, typename RetTy=void>
32 RetTy Visit(Stmt *S) {
34 // If we have a binary expr, dispatch to the subcode of the binop. A smart
35 // optimizer (e.g. LLVM) will fold this comparison into the switch stmt
37 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(S)) {
38 switch (BinOp->getOpcode()) {
39 default: assert(0 && "Unknown binary operator!");
40 case BO_PtrMemD: DISPATCH(BinPtrMemD, BinaryOperator);
41 case BO_PtrMemI: DISPATCH(BinPtrMemI, BinaryOperator);
42 case BO_Mul: DISPATCH(BinMul, BinaryOperator);
43 case BO_Div: DISPATCH(BinDiv, BinaryOperator);
44 case BO_Rem: DISPATCH(BinRem, BinaryOperator);
45 case BO_Add: DISPATCH(BinAdd, BinaryOperator);
46 case BO_Sub: DISPATCH(BinSub, BinaryOperator);
47 case BO_Shl: DISPATCH(BinShl, BinaryOperator);
48 case BO_Shr: DISPATCH(BinShr, BinaryOperator);
50 case BO_LT: DISPATCH(BinLT, BinaryOperator);
51 case BO_GT: DISPATCH(BinGT, BinaryOperator);
52 case BO_LE: DISPATCH(BinLE, BinaryOperator);
53 case BO_GE: DISPATCH(BinGE, BinaryOperator);
54 case BO_EQ: DISPATCH(BinEQ, BinaryOperator);
55 case BO_NE: DISPATCH(BinNE, BinaryOperator);
57 case BO_And: DISPATCH(BinAnd, BinaryOperator);
58 case BO_Xor: DISPATCH(BinXor, BinaryOperator);
59 case BO_Or : DISPATCH(BinOr, BinaryOperator);
60 case BO_LAnd: DISPATCH(BinLAnd, BinaryOperator);
61 case BO_LOr : DISPATCH(BinLOr, BinaryOperator);
62 case BO_Assign: DISPATCH(BinAssign, BinaryOperator);
63 case BO_MulAssign: DISPATCH(BinMulAssign, CompoundAssignOperator);
64 case BO_DivAssign: DISPATCH(BinDivAssign, CompoundAssignOperator);
65 case BO_RemAssign: DISPATCH(BinRemAssign, CompoundAssignOperator);
66 case BO_AddAssign: DISPATCH(BinAddAssign, CompoundAssignOperator);
67 case BO_SubAssign: DISPATCH(BinSubAssign, CompoundAssignOperator);
68 case BO_ShlAssign: DISPATCH(BinShlAssign, CompoundAssignOperator);
69 case BO_ShrAssign: DISPATCH(BinShrAssign, CompoundAssignOperator);
70 case BO_AndAssign: DISPATCH(BinAndAssign, CompoundAssignOperator);
71 case BO_OrAssign: DISPATCH(BinOrAssign, CompoundAssignOperator);
72 case BO_XorAssign: DISPATCH(BinXorAssign, CompoundAssignOperator);
73 case BO_Comma: DISPATCH(BinComma, BinaryOperator);
75 } else if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(S)) {
76 switch (UnOp->getOpcode()) {
77 default: assert(0 && "Unknown unary operator!");
78 case UO_PostInc: DISPATCH(UnaryPostInc, UnaryOperator);
79 case UO_PostDec: DISPATCH(UnaryPostDec, UnaryOperator);
80 case UO_PreInc: DISPATCH(UnaryPreInc, UnaryOperator);
81 case UO_PreDec: DISPATCH(UnaryPreDec, UnaryOperator);
82 case UO_AddrOf: DISPATCH(UnaryAddrOf, UnaryOperator);
83 case UO_Deref: DISPATCH(UnaryDeref, UnaryOperator);
84 case UO_Plus: DISPATCH(UnaryPlus, UnaryOperator);
85 case UO_Minus: DISPATCH(UnaryMinus, UnaryOperator);
86 case UO_Not: DISPATCH(UnaryNot, UnaryOperator);
87 case UO_LNot: DISPATCH(UnaryLNot, UnaryOperator);
88 case UO_Real: DISPATCH(UnaryReal, UnaryOperator);
89 case UO_Imag: DISPATCH(UnaryImag, UnaryOperator);
90 case UO_Extension: DISPATCH(UnaryExtension, UnaryOperator);
94 // Top switch stmt: dispatch to VisitFooStmt for each FooStmt.
95 switch (S->getStmtClass()) {
96 default: assert(0 && "Unknown stmt kind!");
97 #define ABSTRACT_STMT(STMT)
98 #define STMT(CLASS, PARENT) \
99 case Stmt::CLASS ## Class: DISPATCH(CLASS, CLASS);
100 #include "clang/AST/StmtNodes.inc"
104 // If the implementation chooses not to implement a certain visit method, fall
105 // back on VisitExpr or whatever else is the superclass.
106 #define STMT(CLASS, PARENT) \
107 RetTy Visit ## CLASS(CLASS *S) { DISPATCH(PARENT, PARENT); }
108 #include "clang/AST/StmtNodes.inc"
110 // If the implementation doesn't implement binary operator methods, fall back
111 // on VisitBinaryOperator.
112 #define BINOP_FALLBACK(NAME) \
113 RetTy VisitBin ## NAME(BinaryOperator *S) { \
114 DISPATCH(BinaryOperator, BinaryOperator); \
116 BINOP_FALLBACK(PtrMemD) BINOP_FALLBACK(PtrMemI)
117 BINOP_FALLBACK(Mul) BINOP_FALLBACK(Div) BINOP_FALLBACK(Rem)
118 BINOP_FALLBACK(Add) BINOP_FALLBACK(Sub) BINOP_FALLBACK(Shl)
121 BINOP_FALLBACK(LT) BINOP_FALLBACK(GT) BINOP_FALLBACK(LE)
122 BINOP_FALLBACK(GE) BINOP_FALLBACK(EQ) BINOP_FALLBACK(NE)
123 BINOP_FALLBACK(And) BINOP_FALLBACK(Xor) BINOP_FALLBACK(Or)
124 BINOP_FALLBACK(LAnd) BINOP_FALLBACK(LOr)
126 BINOP_FALLBACK(Assign)
127 BINOP_FALLBACK(Comma)
128 #undef BINOP_FALLBACK
130 // If the implementation doesn't implement compound assignment operator
131 // methods, fall back on VisitCompoundAssignOperator.
132 #define CAO_FALLBACK(NAME) \
133 RetTy VisitBin ## NAME(CompoundAssignOperator *S) { \
134 DISPATCH(CompoundAssignOperator, CompoundAssignOperator); \
136 CAO_FALLBACK(MulAssign) CAO_FALLBACK(DivAssign) CAO_FALLBACK(RemAssign)
137 CAO_FALLBACK(AddAssign) CAO_FALLBACK(SubAssign) CAO_FALLBACK(ShlAssign)
138 CAO_FALLBACK(ShrAssign) CAO_FALLBACK(AndAssign) CAO_FALLBACK(OrAssign)
139 CAO_FALLBACK(XorAssign)
142 // If the implementation doesn't implement unary operator methods, fall back
143 // on VisitUnaryOperator.
144 #define UNARYOP_FALLBACK(NAME) \
145 RetTy VisitUnary ## NAME(UnaryOperator *S) { \
146 DISPATCH(UnaryOperator, UnaryOperator); \
148 UNARYOP_FALLBACK(PostInc) UNARYOP_FALLBACK(PostDec)
149 UNARYOP_FALLBACK(PreInc) UNARYOP_FALLBACK(PreDec)
150 UNARYOP_FALLBACK(AddrOf) UNARYOP_FALLBACK(Deref)
152 UNARYOP_FALLBACK(Plus) UNARYOP_FALLBACK(Minus)
153 UNARYOP_FALLBACK(Not) UNARYOP_FALLBACK(LNot)
154 UNARYOP_FALLBACK(Real) UNARYOP_FALLBACK(Imag)
155 UNARYOP_FALLBACK(Extension)
156 #undef UNARYOP_FALLBACK
158 // Base case, ignore it. :)
159 RetTy VisitStmt(Stmt *Node) { return RetTy(); }
164 } // end namespace clang