/* * 686_slice_str_global_zero — a bare module-level `str` global and a * bare `[]u8` slice global emit their 24-byte zero header EXACTLY ONCE, * and cstage / wwstage agree byte-for-byte (task #10 part b). * * The bug (wwstage only): post-#1, size(str) == size(slice) == 24. The * emitletdataw str arm and slice arm were sequential `if`s gated on * SIZE alone, so both matched a 24-byte bare global and BOTH fired the * no-rhs zero fallback — two `DATAW main.g` rows. cstage discriminates * on type kind (let_isstr / let_isslice) and emits one. Runtime reads * the null header {0,0,0} correctly either way, so the divergence is * byte-id-visible only — the asm_byte_identical gate is the real * discriminator; the exit-code rows assert correctness is preserved. * * The fix: emitletdataw's str and slice arms now branch on the declared * type kind (letdeclkind, TY_NAMED-peeled, mirroring let_isstr/ * let_isslice), mutually exclusive, so a 24B global hits one arm. * * row | shape | want * -----------------+----------------------------------------+------ * slice_len | global let g:[]u8; g.len | 0 * slice_cap | global let g:[]u8; g.cap | 0 * slice_ptr_null | global let g:[]u8; g.ptr==nil ? 7 : 0 | 7 * str_len | global let s:str; s.len | 0 * str_ptr_null | global let s:str; s.ptr==nil ? 9 : 0 | 9 */ #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[] = { { "slice_len", "package main;\n" "let g: []u8;\n" "export fn main() i32 = { return g.len: i32; };\n", 0 }, { "slice_cap", "package main;\n" "let g: []u8;\n" "export fn main() i32 = { return g.cap: i32; };\n", 0 }, { "slice_ptr_null", "package main;\n" "let g: []u8;\n" "export fn main() i32 = {\n" "\tif (g.ptr == nil) { return 7; };\n" "\treturn 0;\n" "};\n", 7 }, { "str_len", "package main;\n" "let s: str;\n" "export fn main() i32 = { return s.len: i32; };\n", 0 }, { "str_ptr_null", "package main;\n" "let s: str;\n" "export fn main() i32 = {\n" "\tif (s.ptr == nil) { return 9; };\n" "\treturn 0;\n" "};\n", 9 }, }; 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/ssgz_%d_%d.ww", getpid(), i); snprintf(tmpdir, sizeof tmpdir, "/tmp/ssgz_%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. * This is the #10-part-b discriminator: the old size-keyed double-emit * produced a second DATAW row in the wwstage .s. */ 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/ssgz_asm_%d_%d.ww", getpid(), i); snprintf(cs, sizeof cs, "/tmp/ssgz_asm_%d_%d_c.s", getpid(), i); snprintf(ws, sizeof ws, "/tmp/ssgz_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, "slice_str_global_zero: 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, "slice_str_global_zero[%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, "slice_str_global_zero: %d/%d fixtures failed\n", fail, total); return 1; } printf("slice_str_global_zero: %d/%d ok\n", total, total); return 0; }