bcpow() — internals

bcpow() — internals

Where it lives

• Signature: src/builtins/math/bcpow.rs
• Lowering: src/builtins/semantics.rs:639 (lower_registry_call)
• Function symbol: lower_registry_call()

Lowering notes

• Uses the runtime_call strategy from the single-source builtin descriptor.
• Emits the typed EIR target runtime.bcpow through BuiltinLoweringContext.
• The backend resolves that typed target through src/codegen/lower_inst/runtime_calls.rs; PHP builtin names do not participate in dispatch.

Semantic descriptor

• Target strategy: runtime_call
• Validation: signature
• Result type source: declared
• Result ownership: fresh
• Effects: static (3 declared effects)
• Requirements: static (1 requirements)
• Callable policy: static_only
• Target support: macos-aarch64, ios-arm64, ios-sim-arm64, linux-aarch64, linux-x86_64

EIR and runtime boundary

• Typed EIR target: runtime.bcpow
• Backend boundary: src/codegen/lower_inst/runtime_calls.rs resolves the typed target without PHP-name dispatch.

Signature summary

function bcpow(string $num, string $exponent, ?int $scale = null): string

What the type checker enforces

• Arity: takes 2–3 arguments (1 optional).

Eval interpreter (magician)

• Declaration: crates/elephc-magician/src/interpreter/builtins/math/bcpow.rs (eval_builtin!)
• Execution: Magician interpreter adapter.
• Adapter reason: capability-dependent.
• Dispatch hooks: direct, values

Cross-references

• User reference for bcpow()