protected override void OnGenerate()
{
var var = (CommonTree) T.Children[0];
if (var.Type == 0)
{
Errors.ErrorParse((CommonErrorNode) var);
return;
}
var exp = (CommonTree) T.Children[1];
if (exp.Type == 0)
{
Errors.ErrorParse((CommonErrorNode) exp);
return;
}
var defaultBlock = (CommonTree) T.Children[2];
var blocks = new Dictionary<LoopDirective, CommonTree>();
for (var i = 3; i < T.Children.Count; i++)
{
var targeted = (CommonTree) T.Children[i];
var ins = targeted.Children[0];
var tBlock = (CommonTree) targeted.Children[1];
LoopDirective d;
if (!Enum.TryParse(ins.Text, true, out d))
{
Errors.ErrorUnknownLoopDirective(ins.Text);
continue;
}
blocks[d] = tBlock;
}
if (Errors.ContainsError())
return;
var endOfLoop = Ctx.Sink.DefineLabel();
var continuePoint = Ctx.Sink.DefineLabel();
var top = Ctx.Sink.DefineLabel();
var endOfBlock = Ctx.Sink.DefineLabel();
var oddEvenVar = Ctx.Sink.DeclareLocal(typeof (int));
var iter = Ctx.Sink.DeclareLocal(typeof (IEnumerator));
var current = Ctx.Sink.DeclareLocal(typeof (ITemplateType));
Ctx.PushNewJumpScope(continuePoint, endOfLoop);
try
{
//init part here
var enumerableExp = new Expression(exp);
Errors.AddRange(enumerableExp.Generate(Ctx));
Ctx.Sink.FastEmitStoreLocal(current.LocalIndex);
Ctx.Sink.Emit(OpCodes.Ldarg_0);
Ctx.Sink.FastEmitLoadLocal(current.LocalIndex);
Ctx.EmitVTFunctionCall("CheckIsEnumerable");
Ctx.Sink.Emit(OpCodes.Brfalse, endOfBlock);
Ctx.Sink.Emit(OpCodes.Ldarg_0);
Ctx.Sink.FastEmitLoadLocal(current.LocalIndex);
Ctx.EmitVTFunctionCall("PrimeIter");
Ctx.Sink.FastEmitStoreLocal(iter.LocalIndex);
Ctx.Sink.FastEmitConstInt(0);
Ctx.Sink.FastEmitStoreLocal(oddEvenVar.LocalIndex);
var noDataSkip = Ctx.Sink.DefineLabel();
Ctx.Sink.FastEmitLoadLocal(iter.LocalIndex);
Ctx.EmitIterMoveNext();
Ctx.Sink.Emit(OpCodes.Brfalse, noDataSkip);
var skipStart = Ctx.Sink.DefineLabel();
Ctx.Sink.Emit(OpCodes.Ldarg_0);
Ctx.Sink.FastEmitLoadLocal(iter.LocalIndex);
Ctx.EmitVTFunctionCall("CurrentToTType");
Ctx.Sink.FastEmitStoreLocal(current.LocalIndex);
var s = new Statement(var);
Errors.AddRange(s.GenerateSet(Ctx, current.LocalIndex));
TryEmitBlock(LoopDirective.BeforeAll, blocks);
Ctx.Sink.Emit(OpCodes.Br, skipStart);
Ctx.Sink.MarkLabel(top);
Ctx.Sink.Emit(OpCodes.Nop);
Ctx.Sink.Emit(OpCodes.Ldarg_0);
Ctx.Sink.FastEmitLoadLocal(iter.LocalIndex);
Ctx.EmitVTFunctionCall("CurrentToTType");
Ctx.Sink.FastEmitStoreLocal(current.LocalIndex);
s = new Statement(var);
s.GenerateSet(Ctx, current.LocalIndex);
Ctx.Sink.MarkLabel(skipStart);
Ctx.Sink.Emit(OpCodes.Nop);
if (blocks.ContainsKey(LoopDirective.Between))
{
var skipFirstBetween = Ctx.Sink.DefineLabel();
Ctx.Sink.FastEmitLoadLocal(oddEvenVar.LocalIndex);
Ctx.Sink.FastEmitConstInt(0);
Ctx.Sink.Emit(OpCodes.Ceq);
Ctx.Sink.Emit(OpCodes.Brtrue, skipFirstBetween);
TryEmitBlock(LoopDirective.Between, blocks);
Ctx.Sink.MarkLabel(skipFirstBetween);
}
TryEmitBlock(LoopDirective.Before, blocks);
//even odd
if (blocks.ContainsKey(LoopDirective.Even)
|| blocks.ContainsKey(LoopDirective.Odd))
{
var oddBlock = Ctx.Sink.DefineLabel();
var endOddEvenBlock = Ctx.Sink.DefineLabel();
Ctx.Sink.FastEmitLoadLocal(oddEvenVar.LocalIndex);
Ctx.Sink.FastEmitConstInt(2);
Ctx.Sink.Emit(OpCodes.Rem);
Ctx.Sink.FastEmitConstInt(0);
Ctx.Sink.Emit(OpCodes.Ceq);
Ctx.Sink.Emit(OpCodes.Brfalse, oddBlock);
TryEmitBlock(LoopDirective.Even, blocks);
Ctx.Sink.Emit(OpCodes.Br, endOddEvenBlock);
Ctx.Sink.MarkLabel(oddBlock);
TryEmitBlock(LoopDirective.Odd, blocks);
Ctx.Sink.MarkLabel(endOddEvenBlock);
}
var defaultBlk = new Block(defaultBlock.Children[0]);
Errors.AddRange(defaultBlk.Generate(Ctx));
TryEmitBlock(LoopDirective.Each, blocks);
TryEmitBlock(LoopDirective.After, blocks);
Ctx.Sink.MarkLabel(continuePoint);
//increment odd even var
Ctx.Sink.Emit(OpCodes.Ldc_I4_1);
Ctx.Sink.FastEmitLoadLocal(oddEvenVar.LocalIndex);
Ctx.Sink.Emit(OpCodes.Add);
Ctx.Sink.FastEmitStoreLocal(oddEvenVar.LocalIndex);
//increment
//check condidtion
Ctx.Sink.FastEmitLoadLocal(iter.LocalIndex);
Ctx.EmitIterMoveNext();
Ctx.Sink.Emit(OpCodes.Brtrue, top);
Ctx.Sink.MarkLabel(endOfLoop);
TryEmitBlock(LoopDirective.AfterAll, blocks);
Ctx.Sink.Emit(OpCodes.Br, endOfBlock);
Ctx.Sink.MarkLabel(noDataSkip);
TryEmitBlock(LoopDirective.NoData, blocks);
Ctx.Sink.MarkLabel(endOfBlock);
}
finally
{
Ctx.PopJumpScope();
}
}
private void TryEmitBlock(LoopDirective d, Dictionary<LoopDirective, CommonTree> blocks)
{
CommonTree block;
if (!blocks.TryGetValue(d, out block))
{
Ctx.Sink.Emit(OpCodes.Nop);
return;
}
var b = new Block(block);
Errors.AddRange(b.Generate(Ctx));
}