ww/test/wcc/819_def_str_table.c

/*
 * 819_def_str_table — `def C: [N]str = [...]` module-level str-array static
 * init + element load (#8 / GAP-B, #270 family). A `let [N]str` global static-
 * inits correctly (#18); the def-twin did NOT — both stages emitted the index
 * ref `LEAQ main.C(SB)` but NEVER emitted the backing DATA block, so w6l failed
 * with `undefined reference to 'main.C'` (LOUD, symmetric, both stages — not
 * silent, not cs≠ww).
 *
 * ROOT: emit_strarray_data / emitstrarraydata (the str-array DATAW header +
 * per-element A_DATAR ptr-reloc emitter) was gated to the "DATAW" directive
 * (let only). A def array routes through emit_array_data(..,"DATA",..) so the
 * gate skipped it → no DATA block. The str backing must live in DATAW anyway
 * (w6a requires a DATAR reloc-holder be a DATAW slot, asm.c:362); def
 * immutability is checker-enforced, independent of the section bit. The fix
 * drops the directive gate in BOTH stages so a def str-array rides the same
 * DATAW+DATAR emitter as let. int-defs are plain DATA (no reloc) — unaffected.
 *
 *   row              | shape                                       | want
 *   -----------------+---------------------------------------------+------
 *   def_str_len      | def C:[2]str; C.len                          | 2
 *   def_str_elem0    | def C:[2]str=["ab","cde"]; C[0].len          | 2
 *   def_str_elem1    | def C:[2]str=["ab","cde"]; C[1].len          | 3
 *   def_str_content  | def C:[2]str=["ab","cde"]; C[1][0]   ('c')   | 99  (DATAR reloc
 *                    |                                             |     resolves to the
 *                    |                                             |     right _S_ rodata)
 *   def_str_multi    | def C:[3]str=["a","bb","ccc"]; C[2].len      | 3
 *   def_str_varbind  | def C:[3]str; let s=C[2]; s.len              | 3
 *   let_str_elem1    | let  C:[2]str=["ab","cde"]; C[1].len (CTRL)  | 3   (#18, already
 *                    |                                             |     works; no-regr)
 *
 * Each def row fails-to-LINK pre-fix (mutation-sane: delete the gate-drop and
 * the def rows go back to w6l undefined). let_str_elem1 is the #18 regression
 * guard. A byte-id pass pins cstage==wwstage `.s` for every row (the both-
 * wrong-identical convergence: pre-fix both omit the block, post-fix both emit
 * the same DATAW+DATAR).
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/wait.h>

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[] = {
	/* def_str_len — `.len` on a def str-array (static element count; works
	 * via the def-twin .len arm even pre-#8, but pinned here for the set). */
	{ "def_str_len",
	  "package main;\n"
	  "def C: [2]str = [\"ab\", \"cde\"];\n"
	  "export fn main() i32 = {\n"
	  "\treturn C.len: i32;\n"
	  "};\n",
	  2 },

	/* def_str_elem0 — THE regression: load element 0, read its .len.
	 * Pre-#8 the def DATA block is never emitted → w6l undefined main.C. */
	{ "def_str_elem0",
	  "package main;\n"
	  "def C: [2]str = [\"ab\", \"cde\"];\n"
	  "export fn main() i32 = {\n"
	  "\treturn C[0].len: i32;\n"
	  "};\n",
	  2 },

	/* def_str_elem1 — element 1 .len (ken oracle row). */
	{ "def_str_elem1",
	  "package main;\n"
	  "def C: [2]str = [\"ab\", \"cde\"];\n"
	  "export fn main() i32 = {\n"
	  "\treturn C[1].len: i32;\n"
	  "};\n",
	  3 },

	/* def_str_content — C[1][0] is 'c' (99). Proves the per-element A_DATAR
	 * ptr-reloc resolves to the right _S_ rodata row, not just that a block
	 * exists. */
	{ "def_str_content",
	  "package main;\n"
	  "def C: [2]str = [\"ab\", \"cde\"];\n"
	  "export fn main() i32 = {\n"
	  "\treturn C[1][0]: i32;\n"
	  "};\n",
	  99 },

	/* def_str_multi — 3-element def array, element 2 .len. */
	{ "def_str_multi",
	  "package main;\n"
	  "def C: [3]str = [\"a\", \"bb\", \"ccc\"];\n"
	  "export fn main() i32 = {\n"
	  "\treturn C[2].len: i32;\n"
	  "};\n",
	  3 },

	/* def_str_varbind — bind an element to a let, then read .len (ken
	 * matrix var-bind form: a full 24B str-header element copy). */
	{ "def_str_varbind",
	  "package main;\n"
	  "def C: [3]str = [\"x\", \"yy\", \"zzz\"];\n"
	  "export fn main() i32 = {\n"
	  "\tlet s: str = C[2];\n"
	  "\treturn s.len: i32;\n"
	  "};\n",
	  3 },

	/* let_str_elem1 — CONTROL: the #18 let-global str-array (already works).
	 * Guards against the gate-drop regressing the let path. */
	{ "let_str_elem1",
	  "package main;\n"
	  "let C: [2]str = [\"ab\", \"cde\"];\n"
	  "export fn main() i32 = {\n"
	  "\treturn C[1].len: i32;\n"
	  "};\n",
	  3 },
};

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/dst_%d_%d.ww", getpid(), i);
	snprintf(tmpdir, sizeof tmpdir, "/tmp/dst_%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. */
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/dst_asm_%d_%d.ww", getpid(), i);
	snprintf(cs,  sizeof cs,  "/tmp/dst_asm_%d_%d_c.s", getpid(), i);
	snprintf(ws,  sizeof ws,  "/tmp/dst_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_str_table: 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_str_table[%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_str_table: %d/%d fixtures failed\n", fail, total);
		return 1;
	}
	printf("def_str_table: %d/%d ok\n", total, total);
	return 0;
}