wcc/cgen: loud-align static-global tagged cast-init (wwstage align to cstage)
A module-global tagged init via cast (`let g: u = true: u;`) silently emitted tag=0; cstage louds. Route emittaggeddata through flatvariantidx (the cstage cg_tag_for_variant twin) so an unsupported variant louds while valid str/slice cast-inits still accept+run. test/wcc/838.
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test/wcc/838_global_tagged_castinit.c
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222
test/wcc/838_global_tagged_castinit.c
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/*
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* 838_global_tagged_castinit — E8: a module-level tagged global initialised
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* by a same-type/subset CAST (`let g: u = true: u;`). ken2 spec
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* .ai/ken2-family-spec.md (E8 section). Category A, SILENT-in-ww / cstage-
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* LOUD, aligned DOWN to cstage's loud.
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*
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* ww's emittaggeddata selected the variant via taggedvariantindex, whose
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* str/slice SHAPE fallback (cgenutil.ww) returns the first scalar variant
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* (tag 0) when no variant typeeq's the source. For a CAST init the checker
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* stamps the peeled literal's type as the union itself, so no variant matches
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* and the fallback synthesised tag 0 in the DATA word — SILENT (a bool/int
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* cast ran the int arm, payload mis-tagged). cstage's emit_tagged_data calls
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* cg_tag_for_variant (NO shape fallback, cgen.c:15472) which returns -1 ->
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* the caller loud-stops ("unsupported variant init"). The fix routes ww's
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* emittaggeddata through flatvariantidx — the EXACT cg_tag_for_variant twin —
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* so a cast-init that resolves to no variant louds, while every shape cstage
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* accepts (bare literal, str-literal cast) still resolves via pass 1.
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*
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* neg row | shape | gate
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* -------------+--------------------------------+------
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* E8_boolcast | let g: u = true: u; | FAIL
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* E8_intcast | let g: u = 7: u; | FAIL
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*
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* pos row | shape | want
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* -------------+--------------------------------+------
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* E8_barebool | let g: u = true; match bool | 11
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* E8_bareint | let g: u = 7; match int -> n | 7
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* E8_barestr | let g: u = "hi"; match str | 22
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* E8_strcast | let g: u = "hi": u; (str keeps | 22
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* | str type -> str variant) |
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*
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* The bare-literal forms are clean on both stages (byte-id with cstage); the
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* str-literal CAST keeps its concrete str type and resolves to the str
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* variant, so it must NOT be over-rejected (a naive "N_CAST onto tagged ->
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* loud" predicate would wrongly reject it). u = (int | bool | str): int is
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* variant 0, so bare-int landing on tag 0 is correct (and pins the payload).
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*
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* BYTE-ID: NEUTRAL. A new ww loud emits no asm; cstage already louds; the
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* bootstrap cannot contain a shape cstage refuses. The accept-path tags are
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* unchanged (flatvariantidx returns the same index as the old pass 1). 990-
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* 997 untouched.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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static int
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runwait(const char *cmd)
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{
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int rc = system(cmd);
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if (rc == -1) return -1;
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if (WIFEXITED(rc)) return WEXITSTATUS(rc);
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return -1;
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}
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struct row { const char *label; const char *src; int want; };
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static const char *PROLOGUE =
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"package main;\n"
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"type u = (int | bool | str);\n";
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static const char *EPILOGUE =
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"export fn main() i32 = {\n"
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"\tmatch (g) {\n"
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"\tcase let n: int => return n: i32;\n"
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"\tcase let b: bool => return 11;\n"
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"\tcase let s: str => return 22;\n"
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"\t};\n"
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"\treturn 99;\n"
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"};\n";
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static const struct row rows[] = {
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{ "E8_barebool", "let g: u = true;\n", 11 },
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{ "E8_bareint", "let g: u = 7;\n", 7 },
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{ "E8_barestr", "let g: u = \"hi\";\n", 22 },
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{ "E8_strcast", "let g: u = \"hi\": u;\n", 22 },
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};
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static const char *neg[] = {
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"let g: u = true: u;\n",
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"let g: u = 7: u;\n",
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};
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static void
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write_src(const char *path, const char *mid)
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{
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FILE *f = fopen(path, "wb");
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if (!f) return;
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fputs(PROLOGUE, f);
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fputs(mid, f);
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fputs(EPILOGUE, f);
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fclose(f);
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}
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static int
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run_driver(const char *driver, const struct row *r, int i)
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{
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char src[64], tmpdir[64], cmd[1024];
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snprintf(src, sizeof src, "/tmp/gtc_%d_%d.ww", getpid(), i);
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snprintf(tmpdir, sizeof tmpdir, "/tmp/gtc_%d_d_%d", getpid(), i);
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write_src(src, r->src);
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mkdir(tmpdir, 0755);
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snprintf(cmd, sizeof cmd, "cd %s && %s build %s 2>/dev/null",
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tmpdir, driver, src);
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if (runwait(cmd) != 0) {
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fprintf(stderr, "row[%s]: build via %s failed\n",
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r->label, driver);
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unlink(src); rmdir(tmpdir);
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return -1;
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}
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const char *base = strrchr(src, '/');
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base = base ? base + 1 : src;
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char outbin[128];
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snprintf(outbin, sizeof outbin, "%s/%s", tmpdir, base);
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char *dot = strrchr(outbin, '.');
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if (dot && strcmp(dot, ".ww") == 0) *dot = '\0';
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int got = runwait(outbin);
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unlink(src); unlink(outbin); rmdir(tmpdir);
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return got;
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}
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static int
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build_should_fail(const char *driver, const char *mid, int i)
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{
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char s[64], tmpdir[64], cmd[1024];
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snprintf(s, sizeof s, "/tmp/gtcn_%d_%d.ww", getpid(), i);
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snprintf(tmpdir, sizeof tmpdir, "/tmp/gtcn_%d_d_%d", getpid(), i);
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write_src(s, mid);
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mkdir(tmpdir, 0755);
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snprintf(cmd, sizeof cmd, "cd %s && %s build %s 2>/dev/null",
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tmpdir, driver, s);
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int rc = runwait(cmd);
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unlink(s);
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const char *base = strrchr(s, '/');
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base = base ? base + 1 : s;
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char outbin[128];
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snprintf(outbin, sizeof outbin, "%s/%s", tmpdir, base);
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char *dot = strrchr(outbin, '.');
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if (dot && strcmp(dot, ".ww") == 0) *dot = '\0';
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unlink(outbin);
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rmdir(tmpdir);
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return rc == 0 ? -1 : 0; /* build must NOT succeed */
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}
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int
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main(void)
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{
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const char *bin = getenv("BIN");
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if (!bin) bin = "out/bin";
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char absbin[1024];
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if (bin[0] != '/') {
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char cwd[1024];
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if (getcwd(cwd, sizeof cwd) == NULL) return 1;
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snprintf(absbin, sizeof absbin, "%s/%s", cwd, bin);
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bin = absbin;
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}
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char cdrv[1024];
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snprintf(cdrv, sizeof cdrv, "%s/ww", bin);
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char wdrv[1024];
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snprintf(wdrv, sizeof wdrv, "%s/ww_ww", bin);
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struct { const char *name; const char *path; int gated_on_existence; }
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drivers[] = {
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{ "cstage", cdrv, 0 },
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{ "wwstage", wdrv, 1 },
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{ NULL, NULL, 0 },
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};
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int n = (int)(sizeof rows / sizeof rows[0]);
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int nn = (int)(sizeof neg / sizeof neg[0]);
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int total = 0, fail = 0;
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for (int d = 0; drivers[d].name; d++) {
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if (drivers[d].gated_on_existence
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&& access(drivers[d].path, X_OK) != 0) {
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fprintf(stderr, "global_tagged_castinit: skip %s (no %s)\n",
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drivers[d].name, drivers[d].path);
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continue;
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}
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for (int i = 0; i < n; i++) {
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int got = run_driver(drivers[d].path, &rows[i], i);
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total++;
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if (got != rows[i].want) {
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fprintf(stderr,
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"global_tagged_castinit[%s][%s]: exit=%d want=%d\n",
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drivers[d].name, rows[i].label,
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got, rows[i].want);
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fail++;
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}
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}
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for (int i = 0; i < nn; i++) {
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total++;
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if (build_should_fail(drivers[d].path, neg[i],
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100 + i) != 0) {
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fprintf(stderr,
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"global_tagged_castinit[%s][neg%d]: built ok, "
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"expected a loud reject\n",
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drivers[d].name, i);
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fail++;
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}
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}
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}
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if (fail) {
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fprintf(stderr,
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"global_tagged_castinit: %d/%d fixtures failed\n",
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fail, total);
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return 1;
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}
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printf("global_tagged_castinit: %d/%d ok\n", total, total);
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return 0;
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}
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