ww/test/wcc/851_index_int_reject.c

/*
 * 851_index_int_reject (catB-17) — cstage and wwstage LOUD-REJECT an
 * N_INDEX whose index operand is not an integer (float, str, pointer,
 * bool). cstage already rejected at cmd/wcc/check.c:1491-1495 (the
 * N_INDEX arm: `if (idx != ty_err && !type_isint(idx)) err(...)`).
 * wwstage silently ACCEPTED — indexresult() computed the index type and
 * dropped it (`let _idx = exprtype(...)`), so `xs[f64]` / `xs[str]` /
 * `xs[*T]` / `xs[bool]` compiled. The fix derives the index tinfo and
 * gates syntax.typeisint (selfhost/cmd/wcc/check.ww indexresult), the
 * rule-10 twin of cstage's once-per-N_INDEX site, sibling to
 * validateenummembers (catB-2) / validatestructfields (catB-7/14).
 *
 * The ALIAS-INT accept row is load-bearing: typeisint is the tinfo
 * chaser (follows TY_NAMED.under / TY_ENUM.sub), so `type ix = i32`
 * indexes clean. The AST-keyed isinttypeast would falsely reject it —
 * a vacuous plain-int-only test would not catch that.
 *
 * Byte-id: pure diagnostic, no n.type_ / checker-state mutation beyond
 * c.errs; the valid corpus indexes only by integer types, so codegen of
 * every valid program is unchanged → cstage == wwstage byte-id holds.
 *
 *   reject row   | index operand type   | expect
 *   -------------+----------------------+--------
 *   by_float     | f64                  | REJECT
 *   by_str       | str                  | REJECT
 *   by_ptr       | *i32                 | REJECT
 *   by_bool      | bool                 | REJECT
 *
 *   accept row   | index operand type   | expect
 *   -------------+----------------------+--------
 *   by_int       | int                  | BUILD, run 20
 *   by_uint      | uint                 | BUILD, run 30
 *   by_enum      | named enum value     | BUILD, run 20
 *   by_alias_int | type ix = i32        | BUILD, run 30  (load-bearing)
 */
#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;
}

static void
outbin(char *dst, size_t n, const char *tmpdir, const char *src)
{
	const char *base = strrchr(src, '/');
	base = base ? base + 1 : src;
	snprintf(dst, n, "%s/%s", tmpdir, base);
	char *dot = strrchr(dst, '.');
	if (dot && strcmp(dot, ".ww") == 0) *dot = '\0';
}

static int
filehas(const char *path, const char *needle)
{
	char buf[8192];
	FILE *f = fopen(path, "rb");
	if (!f) return 0;
	size_t n = fread(buf, 1, sizeof buf - 1, f);
	fclose(f);
	buf[n] = '\0';
	return strstr(buf, needle) != NULL;
}

/* A reject row passes only when the build FAILS *and* the stage's clean
 * diagnostic appears; a crash (segfault) wraps as a nonzero "w6c failed"
 * with no diagnostic, so the substring check distinguishes it (#20). */
static int
build_should_fail(const char *driver, const char *label, const char *src,
    const char *diag, int i)
{
	char s[64], tmpdir[64], cmd[1024], bin[128], errf[64];
	snprintf(s, sizeof s, "/tmp/idxr_%d_%d.ww", getpid(), i);
	snprintf(tmpdir, sizeof tmpdir, "/tmp/idxr_%d_d_%d", getpid(), i);
	snprintf(errf, sizeof errf, "/tmp/idxr_%d_e_%d.txt", getpid(), i);
	FILE *f = fopen(s, "wb");
	if (!f) return -1;
	fputs(src, f);
	fclose(f);
	mkdir(tmpdir, 0755);
	snprintf(cmd, sizeof cmd, "cd %s && %s build %s >/dev/null 2>%s",
	    tmpdir, driver, s, errf);
	int rc = runwait(cmd);
	int hasmsg = filehas(errf, diag);
	outbin(bin, sizeof bin, tmpdir, s);
	unlink(s);
	unlink(bin);
	unlink(errf);
	rmdir(tmpdir);
	if (rc == 0) {
		fprintf(stderr, "idxr[%s][%s]: built ok, expected a reject\n",
		    driver, label);
		return -1;
	}
	if (!hasmsg) {
		fprintf(stderr, "idxr[%s][%s]: nonzero exit but missing "
		    "diagnostic \"%s\" (a crash, not a clean reject)\n",
		    driver, label, diag);
		return -1;
	}
	return 0;
}

static int
run_build(const char *driver, const char *label, const char *src, int i)
{
	char s[64], tmpdir[64], cmd[1024], bin[128];
	snprintf(s, sizeof s, "/tmp/idxr_ok_%d_%d.ww", getpid(), i);
	snprintf(tmpdir, sizeof tmpdir, "/tmp/idxr_ok_%d_d_%d", getpid(), i);
	FILE *f = fopen(s, "wb");
	if (!f) return -1;
	fputs(src, f);
	fclose(f);
	mkdir(tmpdir, 0755);
	snprintf(cmd, sizeof cmd, "cd %s && %s build %s 2>/dev/null",
	    tmpdir, driver, s);
	if (runwait(cmd) != 0) {
		fprintf(stderr, "idxr[%s][%s]: build failed (integer index "
		    "must compile)\n", driver, label);
		unlink(s); rmdir(tmpdir);
		return -1;
	}
	outbin(bin, sizeof bin, tmpdir, s);
	int got = runwait(bin);
	unlink(s); unlink(bin); rmdir(tmpdir);
	return got;
}

struct rejrow { const char *label; const char *src; const char *diag; };

static const struct rejrow reject_rows[] = {
	{ "by_float",
	  "package main;\n"
	  "fn main() i32 = {\n"
	  "	let a: [3]i32 = [10i32, 20i32, 30i32];\n"
	  "	let f: f64 = 1.0;\n"
	  "	return a[f];\n"
	  "};\n",
	  "index must be integer" },
	{ "by_str",
	  "package main;\n"
	  "fn main() i32 = {\n"
	  "	let a: [3]i32 = [10i32, 20i32, 30i32];\n"
	  "	let s: str = \"x\";\n"
	  "	return a[s];\n"
	  "};\n",
	  "index must be integer" },
	{ "by_ptr",
	  "package main;\n"
	  "fn main() i32 = {\n"
	  "	let a: [3]i32 = [10i32, 20i32, 30i32];\n"
	  "	let p: *i32 = nil;\n"
	  "	return a[p];\n"
	  "};\n",
	  "index must be integer" },
	{ "by_bool",
	  "package main;\n"
	  "fn main() i32 = {\n"
	  "	let a: [3]i32 = [10i32, 20i32, 30i32];\n"
	  "	let b: bool = true;\n"
	  "	return a[b];\n"
	  "};\n",
	  "index must be integer" },
};

struct okrow { const char *label; const char *src; int want; };

static const struct okrow ok_rows[] = {
	{ "by_int",
	  "package main;\n"
	  "fn main() i32 = {\n"
	  "	let a: [3]i32 = [10i32, 20i32, 30i32];\n"
	  "	let i: int = 1;\n"
	  "	return a[i];\n"
	  "};\n",
	  20 },
	{ "by_uint",
	  "package main;\n"
	  "fn main() i32 = {\n"
	  "	let a: [3]i32 = [10i32, 20i32, 30i32];\n"
	  "	let i: uint = 2;\n"
	  "	return a[i];\n"
	  "};\n",
	  30 },
	{ "by_enum",
	  "package main;\n"
	  "type col = enum { A, B, C };\n"
	  "fn main() i32 = {\n"
	  "	let a: [3]i32 = [10i32, 20i32, 30i32];\n"
	  "	return a[col.B];\n"
	  "};\n",
	  20 },
	{ "by_alias_int",
	  "package main;\n"
	  "type ix = i32;\n"
	  "fn main() i32 = {\n"
	  "	let a: [3]i32 = [10i32, 20i32, 30i32];\n"
	  "	let i: ix = 2;\n"
	  "	return a[i];\n"
	  "};\n",
	  30 },
};

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], wdrv[1024];
	snprintf(cdrv, sizeof cdrv, "%s/ww", bin);
	snprintf(wdrv, sizeof wdrv, "%s/ww_ww", bin);

	struct { const char *name; const char *path; int gated; } drivers[] = {
		{ "cstage",  cdrv, 0 },
		{ "wwstage", wdrv, 1 },
		{ NULL, NULL, 0 },
	};

	int nrej = (int)(sizeof reject_rows / sizeof reject_rows[0]);
	int nok = (int)(sizeof ok_rows / sizeof ok_rows[0]);
	int total = 0, fail = 0;

	for (int d = 0; drivers[d].name; d++) {
		if (drivers[d].gated && access(drivers[d].path, X_OK) != 0) {
			fprintf(stderr, "idxr: skip %s (no %s)\n",
			    drivers[d].name, drivers[d].path);
			continue;
		}
		for (int i = 0; i < nrej; i++) {
			total++;
			if (build_should_fail(drivers[d].path,
			    reject_rows[i].label, reject_rows[i].src,
			    reject_rows[i].diag, d * 100 + i) != 0)
				fail++;
		}
		for (int i = 0; i < nok; i++) {
			total++;
			int got = run_build(drivers[d].path, ok_rows[i].label,
			    ok_rows[i].src, d * 100 + i);
			if (got != ok_rows[i].want) {
				fprintf(stderr, "idxr[%s][%s]: exit=%d want=%d\n",
				    drivers[d].name, ok_rows[i].label,
				    got, ok_rows[i].want);
				fail++;
			}
		}
	}

	if (fail) {
		fprintf(stderr, "idxr: %d/%d fixtures failed\n", fail, total);
		return 1;
	}
	printf("idxr: %d/%d ok\n", total, total);
	return 0;
}