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//===- StmtVisitor.h - Visitor for Stmt subclasses --------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines the StmtVisitor and ConstStmtVisitor interfaces.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_AST_STMTVISITOR_H
#define LLVM_CLANG_AST_STMTVISITOR_H
#include "clang/AST/ExprCXX.h"
#include "clang/AST/ExprObjC.h"
#include "clang/AST/ExprOpenMP.h"
#include "clang/AST/Stmt.h"
#include "clang/AST/StmtCXX.h"
#include "clang/AST/StmtObjC.h"
#include "clang/AST/StmtOpenMP.h"
#include "clang/Basic/LLVM.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/ErrorHandling.h"
#include <utility>
namespace clang {
/// StmtVisitorBase - This class implements a simple visitor for Stmt
/// subclasses. Since Expr derives from Stmt, this also includes support for
/// visiting Exprs.
template<template <typename> class Ptr, typename ImplClass, typename RetTy=void,
class... ParamTys>
class StmtVisitorBase {
public:
#define PTR(CLASS) typename Ptr<CLASS>::type
#define DISPATCH(NAME, CLASS) \
return static_cast<ImplClass*>(this)->Visit ## NAME( \
static_cast<PTR(CLASS)>(S), std::forward<ParamTys>(P)...)
RetTy Visit(PTR(Stmt) S, ParamTys... P) {
// If we have a binary expr, dispatch to the subcode of the binop. A smart
// optimizer (e.g. LLVM) will fold this comparison into the switch stmt
// below.
if (PTR(BinaryOperator) BinOp = dyn_cast<BinaryOperator>(S)) {
switch (BinOp->getOpcode()) {
case BO_PtrMemD: DISPATCH(BinPtrMemD, BinaryOperator);
case BO_PtrMemI: DISPATCH(BinPtrMemI, BinaryOperator);
case BO_Mul: DISPATCH(BinMul, BinaryOperator);
case BO_Div: DISPATCH(BinDiv, BinaryOperator);
case BO_Rem: DISPATCH(BinRem, BinaryOperator);
case BO_Add: DISPATCH(BinAdd, BinaryOperator);
case BO_Sub: DISPATCH(BinSub, BinaryOperator);
case BO_Shl: DISPATCH(BinShl, BinaryOperator);
case BO_Shr: DISPATCH(BinShr, BinaryOperator);
case BO_LT: DISPATCH(BinLT, BinaryOperator);
case BO_GT: DISPATCH(BinGT, BinaryOperator);
case BO_LE: DISPATCH(BinLE, BinaryOperator);
case BO_GE: DISPATCH(BinGE, BinaryOperator);
case BO_EQ: DISPATCH(BinEQ, BinaryOperator);
case BO_NE: DISPATCH(BinNE, BinaryOperator);
case BO_Cmp: DISPATCH(BinCmp, BinaryOperator);
case BO_And: DISPATCH(BinAnd, BinaryOperator);
case BO_Xor: DISPATCH(BinXor, BinaryOperator);
case BO_Or : DISPATCH(BinOr, BinaryOperator);
case BO_LAnd: DISPATCH(BinLAnd, BinaryOperator);
case BO_LOr : DISPATCH(BinLOr, BinaryOperator);
case BO_Assign: DISPATCH(BinAssign, BinaryOperator);
case BO_MulAssign: DISPATCH(BinMulAssign, CompoundAssignOperator);
case BO_DivAssign: DISPATCH(BinDivAssign, CompoundAssignOperator);
case BO_RemAssign: DISPATCH(BinRemAssign, CompoundAssignOperator);
case BO_AddAssign: DISPATCH(BinAddAssign, CompoundAssignOperator);
case BO_SubAssign: DISPATCH(BinSubAssign, CompoundAssignOperator);
case BO_ShlAssign: DISPATCH(BinShlAssign, CompoundAssignOperator);
case BO_ShrAssign: DISPATCH(BinShrAssign, CompoundAssignOperator);
case BO_AndAssign: DISPATCH(BinAndAssign, CompoundAssignOperator);
case BO_OrAssign: DISPATCH(BinOrAssign, CompoundAssignOperator);
case BO_XorAssign: DISPATCH(BinXorAssign, CompoundAssignOperator);
case BO_Comma: DISPATCH(BinComma, BinaryOperator);
}
} else if (PTR(UnaryOperator) UnOp = dyn_cast<UnaryOperator>(S)) {
switch (UnOp->getOpcode()) {
case UO_PostInc: DISPATCH(UnaryPostInc, UnaryOperator);
case UO_PostDec: DISPATCH(UnaryPostDec, UnaryOperator);
case UO_PreInc: DISPATCH(UnaryPreInc, UnaryOperator);
case UO_PreDec: DISPATCH(UnaryPreDec, UnaryOperator);
case UO_AddrOf: DISPATCH(UnaryAddrOf, UnaryOperator);
case UO_Deref: DISPATCH(UnaryDeref, UnaryOperator);
case UO_Plus: DISPATCH(UnaryPlus, UnaryOperator);
case UO_Minus: DISPATCH(UnaryMinus, UnaryOperator);
case UO_Not: DISPATCH(UnaryNot, UnaryOperator);
case UO_LNot: DISPATCH(UnaryLNot, UnaryOperator);
case UO_Real: DISPATCH(UnaryReal, UnaryOperator);
case UO_Imag: DISPATCH(UnaryImag, UnaryOperator);
case UO_Extension: DISPATCH(UnaryExtension, UnaryOperator);
case UO_Coawait: DISPATCH(UnaryCoawait, UnaryOperator);
}
}
// Top switch stmt: dispatch to VisitFooStmt for each FooStmt.
switch (S->getStmtClass()) {
default: llvm_unreachable("Unknown stmt kind!");
#define ABSTRACT_STMT(STMT)
#define STMT(CLASS, PARENT) \
case Stmt::CLASS ## Class: DISPATCH(CLASS, CLASS);
#include "clang/AST/StmtNodes.inc"
}
}
// If the implementation chooses not to implement a certain visit method, fall
// back on VisitExpr or whatever else is the superclass.
#define STMT(CLASS, PARENT) \
RetTy Visit ## CLASS(PTR(CLASS) S, ParamTys... P) { DISPATCH(PARENT, PARENT); }
#include "clang/AST/StmtNodes.inc"
// If the implementation doesn't implement binary operator methods, fall back
// on VisitBinaryOperator.
#define BINOP_FALLBACK(NAME) \
RetTy VisitBin ## NAME(PTR(BinaryOperator) S, ParamTys... P) { \
DISPATCH(BinaryOperator, BinaryOperator); \
}
BINOP_FALLBACK(PtrMemD) BINOP_FALLBACK(PtrMemI)
BINOP_FALLBACK(Mul) BINOP_FALLBACK(Div) BINOP_FALLBACK(Rem)
BINOP_FALLBACK(Add) BINOP_FALLBACK(Sub) BINOP_FALLBACK(Shl)
BINOP_FALLBACK(Shr)
BINOP_FALLBACK(LT) BINOP_FALLBACK(GT) BINOP_FALLBACK(LE)
BINOP_FALLBACK(GE) BINOP_FALLBACK(EQ) BINOP_FALLBACK(NE)
BINOP_FALLBACK(Cmp)
BINOP_FALLBACK(And) BINOP_FALLBACK(Xor) BINOP_FALLBACK(Or)
BINOP_FALLBACK(LAnd) BINOP_FALLBACK(LOr)
BINOP_FALLBACK(Assign)
BINOP_FALLBACK(Comma)
#undef BINOP_FALLBACK
// If the implementation doesn't implement compound assignment operator
// methods, fall back on VisitCompoundAssignOperator.
#define CAO_FALLBACK(NAME) \
RetTy VisitBin ## NAME(PTR(CompoundAssignOperator) S, ParamTys... P) { \
DISPATCH(CompoundAssignOperator, CompoundAssignOperator); \
}
CAO_FALLBACK(MulAssign) CAO_FALLBACK(DivAssign) CAO_FALLBACK(RemAssign)
CAO_FALLBACK(AddAssign) CAO_FALLBACK(SubAssign) CAO_FALLBACK(ShlAssign)
CAO_FALLBACK(ShrAssign) CAO_FALLBACK(AndAssign) CAO_FALLBACK(OrAssign)
CAO_FALLBACK(XorAssign)
#undef CAO_FALLBACK
// If the implementation doesn't implement unary operator methods, fall back
// on VisitUnaryOperator.
#define UNARYOP_FALLBACK(NAME) \
RetTy VisitUnary ## NAME(PTR(UnaryOperator) S, ParamTys... P) { \
DISPATCH(UnaryOperator, UnaryOperator); \
}
UNARYOP_FALLBACK(PostInc) UNARYOP_FALLBACK(PostDec)
UNARYOP_FALLBACK(PreInc) UNARYOP_FALLBACK(PreDec)
UNARYOP_FALLBACK(AddrOf) UNARYOP_FALLBACK(Deref)
UNARYOP_FALLBACK(Plus) UNARYOP_FALLBACK(Minus)
UNARYOP_FALLBACK(Not) UNARYOP_FALLBACK(LNot)
UNARYOP_FALLBACK(Real) UNARYOP_FALLBACK(Imag)
UNARYOP_FALLBACK(Extension) UNARYOP_FALLBACK(Coawait)
#undef UNARYOP_FALLBACK
// Base case, ignore it. :)
RetTy VisitStmt(PTR(Stmt) Node, ParamTys... P) { return RetTy(); }
#undef PTR
#undef DISPATCH
};
/// StmtVisitor - This class implements a simple visitor for Stmt subclasses.
/// Since Expr derives from Stmt, this also includes support for visiting Exprs.
///
/// This class does not preserve constness of Stmt pointers (see also
/// ConstStmtVisitor).
template <typename ImplClass, typename RetTy = void, typename... ParamTys>
class StmtVisitor
: public StmtVisitorBase<std::add_pointer, ImplClass, RetTy, ParamTys...> {
};
/// ConstStmtVisitor - This class implements a simple visitor for Stmt
/// subclasses. Since Expr derives from Stmt, this also includes support for
/// visiting Exprs.
///
/// This class preserves constness of Stmt pointers (see also StmtVisitor).
template <typename ImplClass, typename RetTy = void, typename... ParamTys>
class ConstStmtVisitor : public StmtVisitorBase<llvm::make_const_ptr, ImplClass,
RetTy, ParamTys...> {};
} // namespace clang
#endif // LLVM_CLANG_AST_STMTVISITOR_H
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