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Implement integer stack opcodes

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gamer147
2026-07-29 15:18:07 -04:00
parent 682f65318b
commit 71ae1b7c5b
6 changed files with 200 additions and 6 deletions
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68
engine/Age.Engine/Vm/VirtualMachine.cs
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@@ -95,9 +95,12 @@ public sealed class VirtualMachine
// returns the same dword through the VM's signed integer-cell representation.
private uint _systemMenuShowDelayMilliseconds;
private readonly Dictionary<string, int> _valueSwitchTargets = new(StringComparer.Ordinal);
// Native EngineCtx owns 11 lazily allocated integer FIFOs at +0x55130. ATSEEK/MVSEEK use
// slot zero as their packed-coordinate flood-fill worklist; op 0x132 replaces a slot.
// Eleven safely isolated handler-addressable FIFO slots. Native physically owns ten at
// +0x55130; its admitted id 10 aliases stack slot zero. ATSEEK/MVSEEK use FIFO slot zero.
private readonly Queue<int>?[] _intQueues = new Queue<int>?[11];
// Eleven safely isolated handler-addressable LIFO slots. Native constructs ten at +0x55158
// on every scene reset; its admitted id 10 aliases numeric-glyph-style storage.
private readonly Stack<int>[] _intStacks = CreateIntegerStacks();
// Opcodes 0x06/0x08 load scripts into numbered EngineCtx frame slots and invoke them later.
// Unlike ordinary call-script frames, native non-adjacent slots survive return with locals intact.
private readonly Dictionary<int, PreloadedScriptSlot> _preloadedScriptSlots = new();
@@ -766,6 +769,7 @@ public sealed class VirtualMachine
Gfx.ResetSceneContext();
_valueSwitchTargets.Clear();
_preloadedScriptSlots.Clear();
ResetIntegerStacks();
lock (_interactiveLock)
{
_interactiveFrame = null;
@@ -797,6 +801,20 @@ public sealed class VirtualMachine
_host.ResetSceneContext();
}
private static Stack<int>[] CreateIntegerStacks()
{
var stacks = new Stack<int>[11];
for (int i = 0; i < stacks.Length; i++)
stacks[i] = new Stack<int>(0x100);
return stacks;
}
private void ResetIntegerStacks()
{
for (int i = 0; i < _intStacks.Length; i++)
_intStacks[i] = new Stack<int>(0x100);
}
private void RestartBgm(long requestedTrackId, int startMode)
{
if (requestedTrackId != 0)
@@ -1672,6 +1690,52 @@ public sealed class VirtualMachine
}
return pc + 1;
}
case "u0041F1C0":
case "reset-int-stack": // 0x137 (stack_id)
{
int stackId = unchecked((int)Read(a[0]));
if ((uint)stackId >= (uint)_intStacks.Length)
{
HaltReason ??= $"int-stack-id-out-of-range:{stackId}";
return HALT;
}
_intStacks[stackId] = new Stack<int>(0x100);
return pc + 1;
}
case "u0041F2B0":
case "push-int-stack": // 0x138 (stack_id, value)
{
int stackId = unchecked((int)Read(a[0]));
if ((uint)stackId >= (uint)_intStacks.Length)
{
HaltReason ??= $"int-stack-id-out-of-range:{stackId}";
return HALT;
}
_intStacks[stackId].Push(unchecked((int)Read(a[1])));
return pc + 1;
}
case "u0041F310":
case "try-pop-int-stack": // 0x139 (stack_id, out_success, out_value)
{
int stackId = unchecked((int)Read(a[0]));
if ((uint)stackId >= (uint)_intStacks.Length)
{
HaltReason ??= $"int-stack-id-out-of-range:{stackId}";
return HALT;
}
if (_intStacks[stackId].TryPop(out int value))
{
Write(a[1], 1);
Write(a[2], value);
}
else
{
// Native writes success=0 and leaks an internal EngineCtx pointer through
// operand 3. Preserve the destination instead of exposing host garbage.
Write(a[1], 0);
}
return pc + 1;
}
case "bit-set":
{
long bit = Read(a[1]);