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/* Compiler implementation of the D programming language
* Copyright (C) 1999-2020 by The D Language Foundation, All Rights Reserved
* written by Walter Bright
* http://www.digitalmars.com
* Distributed under the Boost Software License, Version 1.0.
* http://www.boost.org/LICENSE_1_0.txt
* https://github.com/D-Programming-Language/dmd/blob/master/src/sapply.c
*/
#include "root/dsystem.h"
#include "mars.h"
#include "statement.h"
#include "visitor.h"
/**************************************
* A Statement tree walker that will visit each Statement s in the tree,
* in depth-first evaluation order, and call fp(s,param) on it.
* fp() signals whether the walking continues with its return value:
* Returns:
* 0 continue
* 1 done
* It's a bit slower than using virtual functions, but more encapsulated and less brittle.
* Creating an iterator for this would be much more complex.
*/
class PostorderStatementVisitor : public StoppableVisitor
{
public:
StoppableVisitor *v;
PostorderStatementVisitor(StoppableVisitor *v) : v(v) {}
bool doCond(Statement *s)
{
if (!stop && s)
s->accept(this);
return stop;
}
bool applyTo(Statement *s)
{
s->accept(v);
stop = v->stop;
return true;
}
void visit(Statement *s)
{
applyTo(s);
}
void visit(PeelStatement *s)
{
doCond(s->s) || applyTo(s);
}
void visit(CompoundStatement *s)
{
for (size_t i = 0; i < s->statements->length; i++)
if (doCond((*s->statements)[i]))
return;
applyTo(s);
}
void visit(UnrolledLoopStatement *s)
{
for (size_t i = 0; i < s->statements->length; i++)
if (doCond((*s->statements)[i]))
return;
applyTo(s);
}
void visit(ScopeStatement *s)
{
doCond(s->statement) || applyTo(s);
}
void visit(WhileStatement *s)
{
doCond(s->_body) || applyTo(s);
}
void visit(DoStatement *s)
{
doCond(s->_body) || applyTo(s);
}
void visit(ForStatement *s)
{
doCond(s->_init) || doCond(s->_body) || applyTo(s);
}
void visit(ForeachStatement *s)
{
doCond(s->_body) || applyTo(s);
}
void visit(ForeachRangeStatement *s)
{
doCond(s->_body) || applyTo(s);
}
void visit(IfStatement *s)
{
doCond(s->ifbody) || doCond(s->elsebody) || applyTo(s);
}
void visit(PragmaStatement *s)
{
doCond(s->_body) || applyTo(s);
}
void visit(SwitchStatement *s)
{
doCond(s->_body) || applyTo(s);
}
void visit(CaseStatement *s)
{
doCond(s->statement) || applyTo(s);
}
void visit(DefaultStatement *s)
{
doCond(s->statement) || applyTo(s);
}
void visit(SynchronizedStatement *s)
{
doCond(s->_body) || applyTo(s);
}
void visit(WithStatement *s)
{
doCond(s->_body) || applyTo(s);
}
void visit(TryCatchStatement *s)
{
if (doCond(s->_body))
return;
for (size_t i = 0; i < s->catches->length; i++)
if (doCond((*s->catches)[i]->handler))
return;
applyTo(s);
}
void visit(TryFinallyStatement *s)
{
doCond(s->_body) || doCond(s->finalbody) || applyTo(s);
}
void visit(ScopeGuardStatement *s)
{
doCond(s->statement) || applyTo(s);
}
void visit(DebugStatement *s)
{
doCond(s->statement) || applyTo(s);
}
void visit(LabelStatement *s)
{
doCond(s->statement) || applyTo(s);
}
};
bool walkPostorder(Statement *s, StoppableVisitor *v)
{
PostorderStatementVisitor pv(v);
s->accept(&pv);
return v->stop;
}
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