hakorune/docs/development/issues/llvm_binop_string_mismatch.md

# LLVM lowering: string + int causes binop type mismatch

Status: open

Summary

- When compiling code that concatenates a string literal with a non-string (e.g., integer), LLVM object emission fails with a type mismatch in binop.
- Example from `apps/ny-map-llvm-smoke/main.hako`: `print("Map: v=" + v)` and `print("size=" + s)`.

Environment

- LLVM 18 / inkwell 0.5.0
- Phase 11.2 lowering

Repro

1) Run: `NYASH_LLVM_ARRAY_SMOKE=1 ./tools/llvm_smoke.sh release` (or build/link the map smoke similarly)
2) Observe: `❌ LLVM object emit error: binop type mismatch`

Expected

- String concatenation should be lowered to a safe runtime shim (e.g., NyRT string builder or `nyash_string_concat`) that accepts `(i8* string, i64/int)` and returns `i8*`.

Observed

- `+` binop is currently generated as integer addition for non-float operands, leading to a type mismatch when one side is a pointer (string) and the other is integer.

Plan

1) Introduce string-like detection in lowering: if either operand is `String` (or pointer from `nyash_string_new`), route to a NyRT concat shim.
2) Provide NyRT APIs:
   - `nyash.string.concat_ss(i8*, i8*) -> i8*`
   - `nyash.string.concat_si(i8*, i64) -> i8*`
   - Optional: `concat_sf`, `concat_sb` (format helpers)
3) As an interim simplification for smoke, emit `print("..." )` in two steps to avoid mixed-type `+` until the concat shim is ready.

CI

- Keep `apps/ny-llvm-smoke` OFF by default. Re-enable once concat shim lands and binop lowering is updated.
Phase 11-12: LLVM backend initial, semantics layer, plugin unification Major changes: - LLVM backend initial implementation (compiler.rs, llvm mode) - Semantics layer integration in interpreter (operators.rs) - Phase 12 plugin architecture revision (3-layer system) - Builtin box removal preparation - MIR instruction set documentation (26→Core-15 migration) - Cross-backend testing infrastructure - Await/nowait syntax support New features: - LLVM AOT compilation support (--backend llvm) - Semantics layer for interpreter→VM flow - Tri-backend smoke tests - Plugin-only registry mode Bug fixes: - Interpreter plugin box arithmetic operations - Branch test returns incorrect values Documentation: - Phase 12 README.md updated with new plugin architecture - Removed obsolete NYIR proposals - Added LLVM test programs documentation Co-Authored-By: Claude <noreply@anthropic.com> 2025-09-01 23:44:34 +09:00			`# LLVM lowering: string + int causes binop type mismatch`

			`Status: open`

			`Summary`

			`- When compiling code that concatenates a string literal with a non-string (e.g., integer), LLVM object emission fails with a type mismatch in binop.`
phase: 20.49 COMPLETE; 20.50 Flow+String minimal reps; 20.51 selfhost v0/v1 minimal (Option A/B); hv1-inline binop/unop/copy; docs + run_all + CURRENT_TASK -> 21.0 2025-11-06 15:41:52 +09:00			- Example from `apps/ny-map-llvm-smoke/main.hako`: `print("Map: v=" + v)` and `print("size=" + s)`.
Phase 11-12: LLVM backend initial, semantics layer, plugin unification Major changes: - LLVM backend initial implementation (compiler.rs, llvm mode) - Semantics layer integration in interpreter (operators.rs) - Phase 12 plugin architecture revision (3-layer system) - Builtin box removal preparation - MIR instruction set documentation (26→Core-15 migration) - Cross-backend testing infrastructure - Await/nowait syntax support New features: - LLVM AOT compilation support (--backend llvm) - Semantics layer for interpreter→VM flow - Tri-backend smoke tests - Plugin-only registry mode Bug fixes: - Interpreter plugin box arithmetic operations - Branch test returns incorrect values Documentation: - Phase 12 README.md updated with new plugin architecture - Removed obsolete NYIR proposals - Added LLVM test programs documentation Co-Authored-By: Claude <noreply@anthropic.com> 2025-09-01 23:44:34 +09:00
			`Environment`

			`- LLVM 18 / inkwell 0.5.0`
			`- Phase 11.2 lowering`

			`Repro`

			1) Run: `NYASH_LLVM_ARRAY_SMOKE=1 ./tools/llvm_smoke.sh release` (or build/link the map smoke similarly)
			2) Observe: `❌ LLVM object emit error: binop type mismatch`

			`Expected`

			- String concatenation should be lowered to a safe runtime shim (e.g., NyRT string builder or `nyash_string_concat`) that accepts `(i8* string, i64/int)` and returns `i8*`.

			`Observed`

			- `+` binop is currently generated as integer addition for non-float operands, leading to a type mismatch when one side is a pointer (string) and the other is integer.

			`Plan`

			1) Introduce string-like detection in lowering: if either operand is `String` (or pointer from `nyash_string_new`), route to a NyRT concat shim.
			`2) Provide NyRT APIs:`
			- `nyash.string.concat_ss(i8, i8) -> i8*`
			- `nyash.string.concat_si(i8, i64) -> i8`
			- Optional: `concat_sf`, `concat_sb` (format helpers)
			3) As an interim simplification for smoke, emit `print("..." )` in two steps to avoid mixed-type `+` until the concat shim is ready.

			`CI`

			- Keep `apps/ny-llvm-smoke` OFF by default. Re-enable once concat shim lands and binop lowering is updated.