Module instruction 

Instruction set for the stack-based evaluation VM.

The instruction set has two representations:

• Instr: Internal, index-based instructions used by the evaluator. All slot references are absolute stack indices.
• Instruction: Public, Slot-based instructions for inspection and serialization.

Stack layout

[params (param_count)]
[constants (const_count)]
[temporaries (temp_count)]
[outputs (result_count)]

The evaluator pre-fills params from user input and constants from the compiled expression, then executes instructions to compute temporaries and results.

Enums

BuiltinOp

Pre-resolved builtin function operation.

Instr

An internal, index-based instruction executed by super::ExpressionEvaluator.

Instruction

A public, self-documenting instruction.

Slot

A named slot in the evaluator stack.