private void CompileContinue(Node node)
{
if (this.continues == null)
{
Runtime.RaiseCompileError("no loop to continue from", node.span);
}
var cont = new Instruction.Goto {
span = node.span
};
this.continues.Add(cont);
this.Emit(cont);
}
private void CompileBreak(Node node)
{
if (this.breaks == null)
{
Runtime.RaiseCompileError("no loop to break from", node.span);
}
var br = new Instruction.Goto {
span = node.span
};
this.breaks.Add(br);
this.Emit(br);
}
private void CompileIf(Node node)
{
this.CompileExpr(node.children[0]);
var branch = new Instruction.Branch {
span = node.span
};
this.Emit(branch);
var trueIndex = this.CurrentIndex();
this.CompileExpr(node.children[1]);
this.Emit(new Instruction.Discard {
span = node.children[1].span.JustAfter
});
var gotoAfter = new Instruction.Goto {
span = node.children[1].span.JustAfter
};
this.Emit(gotoAfter);
var afterIndex = this.CurrentIndex();
var falseIndex = afterIndex;
if (node.children.Count == 3)
{
this.CompileExpr(node.children[2]);
this.Emit(new Instruction.Discard {
span = node.children[2].span.JustAfter
});
afterIndex = this.CurrentIndex();
}
branch.destinationIfTrue = trueIndex;
branch.destinationIfFalse = falseIndex;
gotoAfter.destination = afterIndex;
this.Emit(new Instruction.PushLiteral {
span = node.span.JustAfter, literal = null
});
}
