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Implement native exit request control flow

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gamer147
2026-07-20 23:02:27 -04:00
parent b71328738d
commit b8cf21245a
6 changed files with 94 additions and 17 deletions
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10
engine/Age.Engine/Vm/VirtualMachine.cs
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@@ -354,8 +354,9 @@ public sealed class VirtualMachine
: unchecked((int)Read(operand)).ToString(System.Globalization.CultureInfo.InvariantCulture);
private sealed class RootReloadRequestedException : Exception { }
private sealed class ProcessExitRequestedException : Exception { }
private sealed record DebugFrameReturnRequest(ExecFrame Frame, IReadOnlyDictionary<int, long> GlobalWrites);
private enum FrameOutcome { Returned, DebugReturned, RootReload, Halted, RanOff }
private enum FrameOutcome { Returned, DebugReturned, RootReload, ExitRequested, Halted, RanOff }
public void Run(int entryOffset = 0)
{
@@ -388,6 +389,7 @@ public sealed class VirtualMachine
}
if (outcome == FrameOutcome.RanOff) HaltReason ??= "pc-out-of-range";
else if (outcome is FrameOutcome.Returned or FrameOutcome.DebugReturned) HaltReason ??= "exit";
else if (outcome == FrameOutcome.ExitRequested) HaltReason ??= "exit-request";
// Halted: HaltReason already set by the halting op.
break;
}
@@ -468,6 +470,7 @@ public sealed class VirtualMachine
}
}
catch (RootReloadRequestedException) { outcome = FrameOutcome.RootReload; }
catch (ProcessExitRequestedException) { outcome = FrameOutcome.ExitRequested; }
_sink.Emit(TraceEvent.FrameExit(frame.Script.Name, _depth, outcome.ToString()));
return outcome;
}
@@ -720,6 +723,10 @@ public sealed class VirtualMachine
Write(a[0], visits == 0 ? (terminal == 0 ? 1 : 0) : terminal);
return pc + 1;
}
case "throw-exit-request":
// Native op 0x1 throws Command_Exit_Exception through callbacks and nested script
// frames. The outer engine loop catches it and exits without advancing frame_pc.
throw new ProcessExitRequestedException();
case "exit": return FRAME_RETURN;
case "exit-script":
// Native op 0x9 clears the process-initial flag, disposes every active script frame,
@@ -743,6 +750,7 @@ public sealed class VirtualMachine
var outcome = RunFrame(new ExecFrame(child, entry), FrameCause.CallScript, id);
if (outcome == FrameOutcome.Halted) return HALT; // propagate whole-VM halt up
if (outcome == FrameOutcome.RootReload) return ROOT_RELOAD; // discard every caller frame
if (outcome == FrameOutcome.ExitRequested) throw new ProcessExitRequestedException();
return pc + 1; // Returned / RanOff: resume caller
}
case "show-text":