/*
 * 796_xmod_valglobal_dot_run — project #229, the N_DOT-base read + addr-of
 * sibling of #1 (test 795). Assembly byte-id net for the cross-module
 * DOTTED value-global miscompile.
 *
 * THE BUG (cgen-only, both stages emit IDENTICAL wrong asm → byte-id was
 * BLIND to it): #1 fixed the DATA def-site and the bare-ident load mangle,
 * but the DOTTED LOAD/addr sites still used the non-preferring leaf lookup
 * (cstage masym, wwstage emitsymname). With
 *   package aa;   export let v: i32 = 7;
 *   package main; import aa; let v: i32 = 99;  main = { return aa.v; }
 * the `aa.v` read AND `&aa.v` emitted `LEAQ main.v(SB)` — the WRONG
 * module's global — returning 99, not 7.
 *
 * THE FIX (#229): thread the DOTTED module name (the `m` in `m.x`) — NOT
 * cur_mod — into the existing value mangle at the four lockstep sites:
 * cstage cgen.c N_DOT read + N_UN addr-of (mahint with n->lhs->str /
 * opnd->lhs->str), wwstage cgenexpr.ww twins (emitsymnamehint with
 * lhs.str / basenm). The TY_FN branches beside each site already use this
 * dotted polarity via mafn/emitfnname; value globals now match.
 *
 * Runtime ownership moved to the matching r796_* fixtures. This carrier
 * retains the w6c vs w6c_ww `.s` comparison required by rule 10.
 *
 * GATE POLARITY: a byte-id failure means the stages diverged.
 */
#include <stdio.h>
#include <stdlib.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_exit; };

static const struct row rows[] = {
	/* N_DOT read: aa.v (7) vs private main.v (99). Pre-fix: 99. */
	{ "i32_dot_read_export_vs_private",
	  "package aa;\n"
	  "export let v: i32 = 7;\n"
	  "package main;\n"
	  "import aa;\n"
	  "let v: i32 = 99;\n"
	  "export fn main() i32 = { return aa.v; };\n", 7 },
	/* addr-of: &aa.v then deref. Pre-fix: 99. */
	{ "i32_addrof_export_vs_private",
	  "package aa;\n"
	  "export let v: i32 = 7;\n"
	  "package main;\n"
	  "import aa;\n"
	  "let v: i32 = 99;\n"
	  "export fn main() i32 = { let p: *i32 = &aa.v; return *p; };\n", 7 },
	{ NULL, NULL, 0 }
};

static int
slurp_eq(const char *a, const char *b)
{
	FILE *fa = fopen(a, "rb");
	FILE *fb = fopen(b, "rb");
	if (!fa || !fb) { if (fa) fclose(fa); if (fb) fclose(fb); return -1; }
	int rc = 0;
	for (;;) {
		int ca = fgetc(fa);
		int cb = fgetc(fb);
		if (ca != cb) { rc = -1; break; }
		if (ca == EOF) break;
	}
	fclose(fa); fclose(fb);
	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 w6c[1100], w6c_ww[1100];
	snprintf(w6c, sizeof w6c, "%s/w6c", bin);
	snprintf(w6c_ww, sizeof w6c_ww, "%s/w6c_ww", bin);
	if (access(w6c_ww, X_OK) != 0) {
		fprintf(stderr, "xmod_valglobal_dot: w6c_ww missing — cannot run "
		    "the cs==ww byte-id gate\n");
		return 1;
	}

	int n = 0, fail = 0;
	for (int i = 0; rows[i].src; i++, n++) {
		char tmpdir[64];
		snprintf(tmpdir, sizeof tmpdir, "/tmp/wwxmvd_%d_d_%d", getpid(), i);
		/* an unowned dir must never be rm -rf'd below */
		if (mkdir(tmpdir, 0755) != 0) {
			perror(tmpdir);
			fail++;
			continue;
		}

		char src[128], cs_s[128], ws_s[128], rmcmd[160];
		snprintf(src, sizeof src, "%s/wwxmvd_%d_%d.ww", tmpdir, getpid(), i);
		snprintf(cs_s, sizeof cs_s, "%s/wwxmvd_%d_%d_cs.s", tmpdir, getpid(), i);
		snprintf(ws_s, sizeof ws_s, "%s/wwxmvd_%d_%d_ww.s", tmpdir, getpid(), i);
		snprintf(rmcmd, sizeof rmcmd, "rm -rf %s", tmpdir);

		FILE *f = fopen(src, "wb");
		if (f == NULL) {
			fail++;
			if (runwait(rmcmd) != 0)
				fprintf(stderr, "row[%s]: cleanup failed: %s\n",
				    rows[i].label, rmcmd);
			continue;
		}
		fputs(rows[i].src, f);
		fclose(f);

		char cmd[2048];
		/* Runtime ownership is r79_xmod_valglobal_dot_*; retain byte-id. */
		snprintf(cmd, sizeof cmd, "%s -o %s %s 2>/dev/null", w6c, cs_s, src);
		if (runwait(cmd) != 0) {
			fprintf(stderr, "row[%s]: w6c failed\n", rows[i].label);
			fail++;
			if (runwait(rmcmd) != 0)
				fprintf(stderr, "row[%s]: cleanup failed: %s\n",
				    rows[i].label, rmcmd);
			continue;
		}
		snprintf(cmd, sizeof cmd, "%s -o %s %s 2>/dev/null",
		    w6c_ww, ws_s, src);
		if (runwait(cmd) != 0) {
			fprintf(stderr, "row[%s]: w6c_ww failed\n", rows[i].label);
			fail++;
			if (runwait(rmcmd) != 0)
				fprintf(stderr, "row[%s]: cleanup failed: %s\n",
				    rows[i].label, rmcmd);
			continue;
		}
		int rowdiff = slurp_eq(cs_s, ws_s) != 0;
		if (rowdiff) {
			fprintf(stderr, "row[%s]: cstage/wwstage .s DIFFER "
			    "(rule-10 byte-id violation)\n", rows[i].label);
			fail++;
		}
		/* a leaked tmpdir fails an otherwise-green row without
		 * masking the byte-id verdict. */
		if (runwait(rmcmd) != 0) {
			fprintf(stderr, "row[%s]: cleanup failed: %s\n",
			    rows[i].label, rmcmd);
			if (!rowdiff)
				fail++;
		}
	}

	if (fail) {
		fprintf(stderr, "%d/%d xmod dotted value-global tests failed\n",
		    fail, n);
		return 1;
	}
	printf("xmod_valglobal_dot: %d/%d ok (cs==ww byte-id)\n",
	    n, n);
	return 0;
}