public void AcceptLoopBlock(LoopBlock stmt)
{
IfStatement cond = stmt.Body.AsSingleStatement() as IfStatement;
if (cond == null)
{
return;
}
if (cond.Conditions.Count != 1 ||
cond.Branches.Count != 2)
{
return;
}
IList <Statement> trueBranch = cond.Branches[0].AsStatementList();
if (trueBranch.Count == 0 ||
!trueBranch.Last().Equals(new ContinueLoopStatement()
{
Loop = stmt
}))
{
return;
}
IList <Statement> falseBranch = cond.Branches[1].AsStatementList();
if (falseBranch.Count == 0)
{
return;
}
#if false
BreakLoopStatement breaker = new BreakLoopStatement()
{
Loop = stmt
};
Statement trailer = cond.Branches[1].Clone;
trailer.RemoveAll(breaker);
#endif
Statement trailer = cond.Branches[1].Clone;
BreakLoopReplacer blr = new BreakLoopReplacer(stmt);
trailer.Accept(blr);
if (trailer.NeedsLoopScope(stmt))
{
return;
}
#if false
CompoundStatement trailer = new CompoundStatement();
trailer.Statements.AddRange(falseBranch.Take(falseBranch.Count - 1));
if (trailer.NeedsLoopScope(stmt))
{
return;
}
BreakLoopStatement breaker = falseBranch.Last() as BreakLoopStatement;
if (breaker == null)
{
return;
}
if (breaker.Loop.IsAncestor(stmt))
{
/* Consider the following situation:
*
* L1: loop
* some outer loop work
* L2: loop
* if someCondition then
* do something
* continue L2
* else
* do something different
* break L1
* end if
* end loop L2
* end loop L1
*
* As the inner break statement breaks the outer loop, this loop
* must be transformed into the following code:
*
* L1: loop
* some outer loop work
* while someCondition loop
* do something
* end while
* do something different
* break L1
* end loop
* */
if (breaker.Loop != stmt)
{
trailer.Statements.Add(breaker);
}
}
else
{
return;
}
#endif
CompoundStatement newBody = new CompoundStatement();
newBody.Statements.AddRange(trueBranch.Take(trueBranch.Count - 1));
LoopBlock whileBlock = (LoopBlock)stmt.Clone;
whileBlock.HeadCondition = cond.Conditions[0];
whileBlock.Body = newBody;
whileBlock.Trailer = trailer;
Result = whileBlock;
}
public void AcceptLoopBlock(LoopBlock stmt)
{
IfStatement cond = stmt.Body.AsSingleStatement() as IfStatement;
if (cond == null)
return;
if (cond.Conditions.Count != 1 ||
cond.Branches.Count != 2)
return;
IList<Statement> trueBranch = cond.Branches[0].AsStatementList();
if (trueBranch.Count == 0 ||
!trueBranch.Last().Equals(new ContinueLoopStatement() { Loop = stmt }))
return;
IList<Statement> falseBranch = cond.Branches[1].AsStatementList();
if (falseBranch.Count == 0)
return;
#if false
BreakLoopStatement breaker = new BreakLoopStatement() { Loop = stmt };
Statement trailer = cond.Branches[1].Clone;
trailer.RemoveAll(breaker);
#endif
Statement trailer = cond.Branches[1].Clone;
BreakLoopReplacer blr = new BreakLoopReplacer(stmt);
trailer.Accept(blr);
if (trailer.NeedsLoopScope(stmt))
return;
#if false
CompoundStatement trailer = new CompoundStatement();
trailer.Statements.AddRange(falseBranch.Take(falseBranch.Count - 1));
if (trailer.NeedsLoopScope(stmt))
return;
BreakLoopStatement breaker = falseBranch.Last() as BreakLoopStatement;
if (breaker == null)
return;
if (breaker.Loop.IsAncestor(stmt))
{
/* Consider the following situation:
*
* L1: loop
* some outer loop work
* L2: loop
* if someCondition then
* do something
* continue L2
* else
* do something different
* break L1
* end if
* end loop L2
* end loop L1
*
* As the inner break statement breaks the outer loop, this loop
* must be transformed into the following code:
*
* L1: loop
* some outer loop work
* while someCondition loop
* do something
* end while
* do something different
* break L1
* end loop
* */
if (breaker.Loop != stmt)
{
trailer.Statements.Add(breaker);
}
}
else
return;
#endif
CompoundStatement newBody = new CompoundStatement();
newBody.Statements.AddRange(trueBranch.Take(trueBranch.Count - 1));
LoopBlock whileBlock = (LoopBlock)stmt.Clone;
whileBlock.HeadCondition = cond.Conditions[0];
whileBlock.Body = newBody;
whileBlock.Trailer = trailer;
Result = whileBlock;
}