/* * 816_def_arr_len — cstage and wwstage agree, byte-for-byte and at runtime, * that `.len` on a module-level `def NAME: [N]T = [...]` array is the static * element count (an immediate `MOVQ $alen, AX`). * * The bug (GAP-A.len, WWSTAGE-ONLY): the #7 let-global `.len` cgdot arm in * selfhost/cmd/wcc/cgenexpr.ww gated on letvartnode (c.lets only). A `def` * lives in c.defs, missed that arm, and fell through to the module-qualified * SB fallback that mis-emitted `MOVQ len(SB)` → w6l: undefined reference to * 'len' (a build/link failure, not silent). cstage cgen.c already emitted the * immediate, so the two stages also DIVERGED. The fix adds a def-twin `.len` * arm using defvartnode (the def-side mirror of letvartnode) — `.len` ONLY. * * SCOPE: `.len` only. `.ptr` (cstage itself emits LEAQ (BP), task GAP-A.ptr) * and `.cap` (arrays have no cap; cstage rejects, wwstage silently emits * garbage, task GAP-A.cap) are SEPARATE bugs, not mirrored here. * * Covers BOTH the explicit-length `def [3]int` and the inferred `def [_]int` * (#11-stamped) so the deftnode/.rhs immediate path is exercised for the * inference case too. * * row | shape | want * ---------------+---------------------------------------------+----- * explicit_len | def A: [3]int=[10,20,30], A.len | 3 * infer_len | def B: [_]int=[1,2,3,4], B.len | 4 * sum | A.len + B.len (ken oracle) | 7 * one_elem | def C: [_]int=[9], C.len | 1 * u8_len | def D: [_]u8=[1u8..5u8], D.len | 5 */ #include #include #include #include #include #include static int runwait(const char *cmd) { int rc = system(cmd); if (rc == -1) return -1; if (WIFEXITED(rc)) return WEXITSTATUS(rc); return -1; } struct row { const char *label; const char *src; int want; }; static const struct row rows[] = { { "explicit_len", "package main;\n" "def A: [3]int = [10, 20, 30];\n" "export fn main() i32 = {\n" "\treturn A.len: i32;\n" "};\n", 3 }, { "infer_len", "package main;\n" "def B: [_]int = [1, 2, 3, 4];\n" "export fn main() i32 = {\n" "\treturn B.len: i32;\n" "};\n", 4 }, /* ken oracle: explicit + inferred together = 7. */ { "sum", "package main;\n" "def A: [3]int = [10, 20, 30];\n" "def B: [_]int = [1, 2, 3, 4];\n" "export fn main() i32 = {\n" "\treturn (A.len: i32) + (B.len: i32);\n" "};\n", 7 }, { "one_elem", "package main;\n" "def C: [_]int = [9];\n" "export fn main() i32 = {\n" "\treturn C.len: i32;\n" "};\n", 1 }, /* narrow stride — `.len` is a count, independent of element width. */ { "u8_len", "package main;\n" "def D: [_]u8 = [1u8, 2u8, 3u8, 4u8, 5u8];\n" "export fn main() i32 = {\n" "\treturn D.len: i32;\n" "};\n", 5 }, }; static int run_driver(const char *driver, const struct row *r, int i) { char src[64], tmpdir[64], cmd[1024]; snprintf(src, sizeof src, "/tmp/dal_%d_%d.ww", getpid(), i); snprintf(tmpdir, sizeof tmpdir, "/tmp/dal_%d_d_%d", getpid(), i); FILE *f = fopen(src, "wb"); if (!f) return -1; fputs(r->src, f); fclose(f); mkdir(tmpdir, 0755); snprintf(cmd, sizeof cmd, "cd %s && %s build %s 2>/dev/null", tmpdir, driver, src); if (runwait(cmd) != 0) { fprintf(stderr, "row[%s]: build via %s failed\n", r->label, driver); unlink(src); rmdir(tmpdir); return -1; } const char *base = strrchr(src, '/'); base = base ? base + 1 : src; char outbin[128]; snprintf(outbin, sizeof outbin, "%s/%s", tmpdir, base); char *dot = strrchr(outbin, '.'); if (dot && strcmp(dot, ".ww") == 0) *dot = '\0'; int got = runwait(outbin); unlink(src); unlink(outbin); rmdir(tmpdir); return got; } /* asm_byte_identical — w6c vs w6c_ww .s for the same source must match. * Post-fix both stages emit `MOVQ $alen, AX`; the rule-10 convergence * invariant. */ static int asm_byte_identical(const char *bin, const struct row *r, int i) { char src[64], cs[64], ws[64], cmd[1024]; snprintf(src, sizeof src, "/tmp/dal_asm_%d_%d.ww", getpid(), i); snprintf(cs, sizeof cs, "/tmp/dal_asm_%d_%d_c.s", getpid(), i); snprintf(ws, sizeof ws, "/tmp/dal_asm_%d_%d_w.s", getpid(), i); FILE *f = fopen(src, "wb"); if (!f) return -1; fputs(r->src, f); fclose(f); snprintf(cmd, sizeof cmd, "%s/w6c -o %s %s 2>/dev/null", bin, cs, src); if (runwait(cmd) != 0) { fprintf(stderr, "row[%s]: w6c errored\n", r->label); unlink(src); return -1; } snprintf(cmd, sizeof cmd, "%s/w6c_ww -o %s %s 2>/dev/null", bin, ws, src); if (runwait(cmd) != 0) { fprintf(stderr, "row[%s]: w6c_ww errored\n", r->label); unlink(src); unlink(cs); return -1; } FILE *fc = fopen(cs, "rb"); FILE *fw = fopen(ws, "rb"); int rc = 0; if (!fc || !fw) { rc = -1; } else { for (;;) { int a = fgetc(fc); int b = fgetc(fw); if (a != b) { rc = -1; break; } if (a == EOF) break; } } if (fc) fclose(fc); if (fw) fclose(fw); if (rc != 0) fprintf(stderr, "row[%s]: cstage vs wwstage asm differs\n", r->label); unlink(src); unlink(cs); unlink(ws); return rc; } int main(void) { const char *bin = getenv("BIN"); if (!bin) bin = "out/bin"; char absbin[1024]; if (bin[0] != '/') { char cwd[1024]; if (getcwd(cwd, sizeof cwd) == NULL) return 1; snprintf(absbin, sizeof absbin, "%s/%s", cwd, bin); bin = absbin; } char cdrv[1024]; snprintf(cdrv, sizeof cdrv, "%s/ww", bin); char wdrv[1024]; snprintf(wdrv, sizeof wdrv, "%s/ww_ww", bin); struct { const char *name; const char *path; int gated_on_existence; } drivers[] = { { "cstage", cdrv, 0 }, { "wwstage", wdrv, 1 }, { NULL, NULL, 0 }, }; int n = (int)(sizeof rows / sizeof rows[0]); int total = 0, fail = 0; for (int d = 0; drivers[d].name; d++) { if (drivers[d].gated_on_existence && access(drivers[d].path, X_OK) != 0) { fprintf(stderr, "def_arr_len: skip %s (no %s)\n", drivers[d].name, drivers[d].path); continue; } for (int i = 0; i < n; i++) { int got = run_driver(drivers[d].path, &rows[i], i); total++; if (got != rows[i].want) { fprintf(stderr, "def_arr_len[%s][%s]: exit=%d want=%d\n", drivers[d].name, rows[i].label, got, rows[i].want); fail++; } } } if (access(wdrv, X_OK) == 0) { for (int i = 0; i < n; i++) { total++; if (asm_byte_identical(bin, &rows[i], i) != 0) fail++; } } if (fail) { fprintf(stderr, "def_arr_len: %d/%d fixtures failed\n", fail, total); return 1; } printf("def_arr_len: %d/%d ok\n", total, total); return 0; }