bdd0e96d78
A block's value is now its last statement ONLY when that statement is a trailing expression with no `;`. A trailing `;` discards the value, leaving the block void. This makes value-vs-statement explicit and lets the compiler reject "this block was supposed to produce a value". Compiler: - Parser records `Block.produces_value` (last stmt is a no-`;` trailing expression) + `Block.discarded_semi` (the `;` that discarded a value), via `expectSemicolonAfter`. A trailing expression before `}` may now omit its `;` (previously a parse error). Match-arm and else-arm bodies are built value-producing regardless of the arm `;` (arms are exempt — the `;` is an arm terminator). - Lowering: `lowerBlockValue` / the block-expr path / `inferExprType` respect `produces_value`. A value-position block that discards its value is a hard error (`lowerValueBody` for function bodies; the value-context `.block` path for if/else branches, `catch` bodies, value bindings, match arms). Pure-failable `-> !` bodies (value rides the error channel) and a value-if whose branches are void are handled without false errors. - `defer`/`onfail` cleanup bodies lower as statements (void), so a trailing `;` there is fine. Migration (behavior-preserving — output unchanged): - stdlib + ~210 examples: dropped the trailing `;` on value-position last expressions. `format` now ends with an explicit `#insert "return result;"` (it relied on `#insert`-as-block-value, which `;` discards). - Two `main :: () -> s32` examples that relied on the old silent default-return got an explicit trailing `0`. - Rejection snapshots 0412 / 1013 regenerated (their quoted source lines lost a `;`); the diagnostics themselves are unchanged. Docs/tests: specs.md "Block values" section; examples 0040 (rules) + 0041 (rejection); 3 parser unit tests. Filed issue 0066 (pre-existing match-arm negated-literal phi-width quirk, surfaced not caused here). Gates: zig build, zig build test, run_examples.sh -> 343 passed, cross_compile.sh -> 7 passed (also refreshed its stale example names).
50 lines
1.9 KiB
Plaintext
50 lines
1.9 KiB
Plaintext
// Phase 0 baseline (PLAN-FFI.md step 0.1): every primitive type passed
|
|
// in/out of a C `#foreign` fn via `#import c { #include / #source }`.
|
|
// Locks today's parameter + return ABI so Phase 1's lowering changes
|
|
// (`#objc_call` / `#jni_call`) can't silently regress us.
|
|
//
|
|
// Note: c_import maps `signed char` to sx `u8` (see c_import.zig:541)
|
|
// — narrow signed-char roundtrips are still surfaced here so any future
|
|
// mapping change shows up as a snapshot diff.
|
|
|
|
#import "modules/std.sx";
|
|
|
|
#import c {
|
|
#include "1209-ffi-01-primitives.h";
|
|
#source "1209-ffi-01-primitives.c";
|
|
};
|
|
|
|
main :: () -> s32 {
|
|
// Signed roundtrips
|
|
print("ffi_id_int(-42) = {}\n", ffi_id_int(0 - 42));
|
|
print("ffi_id_short(-1234) = {}\n", ffi_id_short(0 - 1234));
|
|
print("ffi_id_s64(huge) = {}\n", ffi_id_s64(9000000000000000000));
|
|
|
|
// Unsigned roundtrips
|
|
print("ffi_id_uint(0xDEADBEEF) = {}\n", ffi_id_uint(0xDEADBEEF));
|
|
print("ffi_id_ushort(0xFFFF) = {}\n", ffi_id_ushort(0xFFFF));
|
|
print("ffi_id_u64(0x7FEE...) = {}\n", ffi_id_u64(0x7FEEDFACECAFEBEE));
|
|
|
|
// Narrow char roundtrips (both map to u8 in current sx)
|
|
print("ffi_id_schar(127) = {}\n", ffi_id_schar(127));
|
|
print("ffi_id_uchar(255) = {}\n", ffi_id_uchar(255));
|
|
|
|
// Floating point
|
|
print("ffi_id_f32(3.5) = {}\n", ffi_id_f32(3.5));
|
|
print("ffi_id_f64(1.5) = {}\n", ffi_id_f64(1.5));
|
|
|
|
// Pointer roundtrip — proves *void survives the boundary
|
|
sentinel : s32 = 42;
|
|
p_in : *void = xx @sentinel;
|
|
p_out := ffi_id_ptr(p_in);
|
|
addr_in : u64 = xx p_in;
|
|
addr_out : u64 = xx p_out;
|
|
print("ffi_id_ptr roundtrip = {}\n", addr_in == addr_out);
|
|
|
|
// Arithmetic helpers — exercise multi-arg ABI
|
|
print("ffi_add_int(7, 8) = {}\n", ffi_add_int(7, 8));
|
|
print("ffi_add_double(0.25, 0.75) = {}\n", ffi_add_double(0.25, 0.75));
|
|
|
|
0
|
|
}
|