Module shell_compiler 

Shell compiler — lowers zshrs AST to fusevm bytecodes.

This is the first phase of lowering. We start with arithmetic expressions ($((…))) since they’re pure computation with a direct 1:1 mapping to fusevm ops.

Subsequent phases will lower:

• for/while/until loops → Jump/JumpIfFalse + fused superinstructions
• shell functions → Call/Return/PushFrame/PopFrame
• simple commands → Exec
• pipelines → PipelineBegin/PipelineStage/PipelineEnd
• conditionals [[ ]] → comparison ops + TestFile
• variable expansion → GetVar + string ops

Structs

ArithCompiler

Arithmetic expression compiler.

ShellCompiler

Compiles shell AST to fusevm bytecodes.