Struct JITExecutor 

pub struct JITExecutor {
    pub bytecode_executor: BytecodeExecutor,
}

JIT executor with selective per-function compilation.

JIT-compatible functions are compiled to native code; incompatible functions (e.g. those using async, pattern matching, or unsupported builtins) are left as Interpreted entries in the mixed function table for VM fallback.

--mode jit semantics (W12-jit-mode-semantics-and-fallthrough, 2026-05-18)

--mode jit attempts to JIT-compile the toplevel script and every function it reaches. If JIT compilation or JIT execution fails for any reason (a preflight rejection at compile_program_selective, a Cranelift codegen error, a panic in the JIT pipeline, a RETURN_TAG_NANBOXED kind-source gap surface, etc.), the executor falls through to the bytecode interpreter via BytecodeExecutor::execute_program instead of surfacing a hard error to the CLI. A one-line [jit-fallback] diagnostic is emitted on stderr at tracing::info level (default) so the fall-through is observable but does not silently mask broken programs (the interpreter still re-runs the same Program and surfaces any genuine runtime error from there).

Verbose JIT tracing remains under the --trace-jit=... CLI flag (replaces the legacy SHAPE_JIT_DEBUG env-var per closure-wave-F migration). Tier-up thresholds at T1@100 / T2@10k on hot functions are preserved by the underlying compile_program_selective pipeline — fall-through only fires when JIT can not handle the program at all.

Fields

bytecode_executor: BytecodeExecutor

Bytecode executor used for extension loading, module resolution, and other pre-compilation setup that the CLI wires through. Also the fall-through target when JIT compile/execute fails.

Implementations

impl JITExecutor

pub fn new() -> Self

Trait Implementations

impl ProgramExecutor for JITExecutor

fn execute_program( &mut self, engine: &mut ShapeEngine, program: &Program, ) -> Result<ProgramExecutorResult>