1040b8c776
Restructures the .asm_expr lowering arm into lowerAsmExpr, which validates the
asm shape with specific named diagnostics BEFORE the not-yet-implemented codegen
bail, so the user sees the real problem first. Two checklist items enforced:
- template must be a compile-time-known string ("..." or #string), not a
runtime expression;
- an asm with no value outputs must be `volatile` (else its effects could be
deleted) — mirrors Zig's rule.
Valid shapes still bail with the "codegen not yet implemented" message. Result-
type derivation + the operand auto-naming rule stay deferred to Phase C, where a
real IR op makes the result type observable/testable.
Locked with 1641-platform-asm-missing-volatile (the volatile error) and
1642-platform-asm-nop-volatile (no-output + volatile accepted → codegen bail).
zig build test green (650 corpus, 445 unit).
6 lines
290 B
Plaintext
6 lines
290 B
Plaintext
// ASM stream Phase B — the no-output form IS accepted when `volatile` is
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// present: validation passes, and lowering then bails on the not-yet-
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// implemented codegen (Phases C–E). Confirms the volatile rule's positive side.
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nop :: () { asm volatile { "nop" }; }
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main :: () { nop(); }
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