public AstPostExpression([NotNull] ISourcePosition position, [NotNull] AstExpr expression, [NotNull] AstNode action) : base(position)
{
if (expression == null)
throw new ArgumentNullException("expression");
if (action == null)
throw new ArgumentNullException("action");
_expression = expression;
_action = action;
}
private static void _determineActions(MacroContext context, [InstantHandle] Func<AstGetSet> retValue,
out AstNode contStmt, out AstNode breakStmt)
{
var inv = context.Invocation;
var bl = context.CurrentLoopBlock;
if (bl == null)
{
contStmt = new AstReturn(inv.File, inv.Line, inv.Column, ReturnVariant.Continue)
{Expression = retValue()};
breakStmt = new AstReturn(inv.File, inv.Line, inv.Column, ReturnVariant.Break)
{Expression = retValue()};
}
else
{
contStmt = new AstExplicitGoTo(inv.File, inv.Line, inv.Column, bl.ContinueLabel);
breakStmt = new AstExplicitGoTo(inv.File, inv.Line, inv.Column, bl.BreakLabel);
}
}
private static void _genChecks(MacroContext context, [InstantHandle] Func<AstGetSet> retVar,
AstNode contStmt, AstNode breakStmt)
{
var inv = context.Invocation;
//Generate check for continue
AstCondition checkCont;
{
var contCond = _genCompare(context, retVar(), ReturnVariant.Continue);
checkCont = new AstCondition(inv.Position, context.CurrentBlock, contCond);
checkCont.IfBlock.Add(contStmt);
}
//Generate check for break
AstCondition checkBreak;
{
var breakCond = _genCompare(context, retVar(), ReturnVariant.Break);
checkBreak = new AstCondition(inv.Position, context.CurrentBlock, breakCond);
checkBreak.IfBlock.Add(breakStmt);
}
//Connect break-check to continue check
checkCont.ElseBlock.Add(checkBreak);
context.Block.Add(checkCont);
}
public AstNode GetOptimizedNode(AstNode node)
{
if (node == null)
throw new ArgumentNullException("node");
var expr = node as AstExpr;
if (expr == null || !expr.TryOptimize(_session.Target, out expr))
return node;
else
return expr;
}