public INfaVM Fork(Ref <Labels> label)
{
StThreadValue(label);
runningStack.PushFrom(emit, threadTmp);
return(this);
}
public ILNfaCompiler(AstNode node, EmitSyntax emit, ILCompilerSettings settings)
{
this.Scanner = new StemScanner();
this.emit = emit;
this.settings = settings;
var labels = emit.Labels;
NEXT_THREAD = labels.Generate();
RESUME_ALL = labels.Generate();
NEXT_INPUT = labels.Generate();
THREAD_SUSPEND = labels.Generate();
THREAD_DISPATCH = labels.Generate();
var LABEL0 = labels.Generate();
var LABEL1 = labels.Generate();
var POSTCOMPILEINIT = labels.Generate();
var POSTCOMPILEINIT_BACK = labels.Generate();
var locals = emit.Locals;
slots = locals.Generate();
labelIndexToLocation = locals.Generate();
intTmp = locals.Generate();
threadTmp = locals.Generate();
INfaVM code = this;
this.inputPump = new ArrayLoopGenerator(
valueType: emit.Types.Int32,
ldarray: settings.LdInput,
body:
il => il
.Do(matchedStack.Clear)
.Br(RESUME_ALL.GetRef())
);
this.runningStack = new StackGenerator(emit, typeof(Thread));
this.suspendedStack = new StackGenerator(emit, typeof(Thread));
this.matchedStack = new StackGenerator(emit, typeof(Thread));
this.tmpStack = new StackGenerator(emit, typeof(Thread), nullContainer: true);
emit
.Local(intTmp, emit.Types.Int32)
.Local(slots, emit.Types.Import(typeof(int[])))
.Local(labelIndexToLocation, emit.Types.Import(typeof(int[])))
.Br(POSTCOMPILEINIT.GetRef())
.Label(POSTCOMPILEINIT_BACK)
.Local(threadTmp, emit.Types.Import(typeof(Thread)))
.Ldloca(threadTmp.GetRef())
.Initobj(emit.Types.Import(typeof(Thread)))
.Do(inputPump.EmitInitialization)
;
new RegularNfaVMCompiler().Compile(node, code);
int LabelCount = Math.Max(1, indexToLabel.Count);
this.runningStack.SetSize(LabelCount);
this.suspendedStack.SetSize(LabelCount);
this.matchedStack.SetSize(LabelCount);
this.tmpStack.SetSize(LabelCount);
emit
.Label(POSTCOMPILEINIT)
.Do(runningStack.Init)
.Do(suspendedStack.Init)
.Do(matchedStack.Init)
.Do(tmpStack.Init)
.Ldc_I4(slotCount)
.Newarr(emit.Types.Int32)
.Stloc(slots.GetRef())
.Ldc_I4(LabelCount)
.Newarr(emit.Types.Int32)
.Stloc(labelIndexToLocation.GetRef())
// Fill labelIndexToLocation with -1 :
.Ldc_I4(LabelCount).Stloc(intTmp.GetRef())
.Label(LABEL1)
.Ldloc(intTmp.GetRef())
.Ldc_I4_0()
.Beq(LABEL0.GetRef())
.Ldloc(intTmp.GetRef())
.Ldc_I4(1)
.Sub()
.Stloc(intTmp.GetRef())
.Ldloc(labelIndexToLocation.GetRef())
.Ldloc(intTmp.GetRef())
.Ldc_I4(int.MinValue)
.Stelem_I4()
.Br(LABEL1.GetRef())
.Label(LABEL0)
.Br(POSTCOMPILEINIT_BACK.GetRef());
// Save thread as suspended (stack should already contain label index to suspend)
emit.Label(THREAD_SUSPEND);
StThreadValueByRuntimeLabelIndex();
emit
// Don't add thread if same thread (same label index
// with current input location) already exists in a list.
.Ldloc(labelIndexToLocation.GetRef())
.Ldloca(threadTmp.GetRef())
.Ldfld(LabelIndexField)
.Ldelem_I4()
.Ldloc(inputPump.Index.GetRef())
.Beq(NEXT_THREAD.GetRef())
// Mark label index as visited
.Ldloc(labelIndexToLocation.GetRef())
.Ldloca(threadTmp.GetRef())
.Ldfld(LabelIndexField)
.Ldloc(inputPump.Index.GetRef())
.Stelem_I4()
;
suspendedStack.PushFrom(emit, threadTmp);
emit
.Br(NEXT_THREAD.GetRef())
.Label(RESUME_ALL)
.Swap(suspendedStack.Stack, runningStack.Stack, tmpStack.Stack)
.Swap(suspendedStack.Index, runningStack.Index, tmpStack.Index)
.Label(NEXT_THREAD)
;
runningStack
.StackLoop(
emit,
(emit2, thread) =>
{
emit2
.Ldloca(thread.GetRef())
.Ldfld(LabelIndexField)
.Label(THREAD_DISPATCH)
.Switch(indexToLabel.Select(def => def.GetRef()).ToArray())
.Br(settings.FAILURE.GetRef());
})
;
emit
.Br(NEXT_INPUT.GetRef())
;
emit
.Label(NEXT_INPUT)
;
inputPump.EmitLoopPass(emit, false);
emit
// Check if there are matched threads:
.Do(matchedStack.LdCount)
.Ldc_I4_0()
.Beq(settings.FAILURE.GetRef())
.Br(settings.SUCCESS.GetRef());
}
public INfaVM Match()
{
matchedStack.PushFrom(emit, threadTmp);
emit.Br(NEXT_THREAD.GetRef());
return(this);
}