ProcDecoder Refactor Redux#2651
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June 29, 2026 03:51
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Jun 29, 2026
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| /// <summary> | ||
| /// A typed bytecode operand. Array operands are used only by compact variable-argument opcodes | ||
| /// TODO: When .NET 11 is out, revisit this with C# 15 unions and OneOrMany |
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This is a really important TODO that will be very useful for these changes, but I'm not going to delay the PR by several months to wait for it.
I will open an issue for this when the PR gets merged.
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| } | ||
| case ProcOperandShape.RepeatedString: { | ||
| string[] values = operand0.Strings!; | ||
| for (int i = 0; i < values.Length; i++) { |
| } | ||
| case ProcOperandShape.RepeatedResource: { | ||
| string[] values = operand0.Strings!; | ||
| for (int i = 0; i < values.Length; i++) { |
| } | ||
| case ProcOperandShape.RepeatedReference: { | ||
| DMReference[] values = operand0.References!; | ||
| for (int i = 0; i < values.Length; i++) { |
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This PR has a few main changes:
ProcDecoderwas moved from the runtime to the compiler.DMDisassemblernow depends on the compiler instead of the runtime.ITupleis now aProcInstructioncomprised ofProcOperands that store the argument values.Format()andDecodeInstruction()now utilize opcode metadata to figure out how to handle each opcode rather than using user-definedswitch()cases for each opcode.Most of that handling diverges depending on whether the opcode has a fixed-length argument count or a variable-length argument count (
N-variant opcodes). There's also a fair bit of code repetition for the tradeoff of not having to do a ton of typechecking on what types the arguments actually are.Tested with DM disassembly of /tg/station before and after this PR. Didn't see any non-whitespace diffs.
See my first comment below as well.