/*
 * 944_alias_global_decl_run — g-fold (#77 + #78 fused): alias-typed
 * GLOBAL declarations, both stages. The decl/emit dispatch was
 * alias-blind on both sides:
 *
 *   cs (#78): the let_* helper family (let_emit_size + the five kind
 *   predicates, cgen.c) single-peeled — a 2-level alias chain (or ONE
 *   user alias over a named struct) left the type TY_NAMED, so the
 *   global was never registered, no DATA was emitted, and reads fell
 *   to the frame-local path at offset 0: silent saved-BP reads (garr2
 *   exit-wrong, gst1 SEGV, gstr2/gsl2 silent-wrong). The routed-to
 *   DATA emitters re-peeled at entry and return-0'd into the silent
 *   skip (condition-3 members, enrollment ruling in
 *   .ai/rob-gfold-spec.md).
 *
 *   ww (#77): emitletdataw's array gates + letpreintern's array leg
 *   keyed on the UNCHASED N_TARRAY tnode — an alias-typed global's
 *   N_TNAME matched no arm and the skip-policy ate the decl: loud
 *   `w6l: undefined reference to main.g` on every alias-global ARRAY
 *   row. Fix: ONE tichase at the dispatch entry (dti), array gates +
 *   emitarraydata read it.
 *
 * THIS TABLE IS THE PERMANENT GUARD, not scaffolding: the global decl
 * path is lint-invisible to the future peellint — the ww side was a
 * NO-PEEL consumer (zero `.under` tokens; nothing for a peel-shape
 * lint to flag), and the cs helpers now spell the one chased accessor.
 * Only a runtime+byte-id row pins this behavior.
 *
 * Train trajectory (two commits, one gated train; per-leg states were
 * probe-verified, banked /tmp/implG_probes.md):
 *   pre-G1: garr2 cs EXIT-WRONG / gst1 cs SEGV / gstr2+gsl2+gstlit cs
 *           silent-wrong / gsc2+gflt2 cs loud / ww array rows link-ERR
 *   post-G1 (cs half): every cs row runs 0; ww array rows STILL
 *           link-ERR (loud, documented)
 *   post-G2 (ww half): every row 0/0 byte-id — this file's assertion.
 *
 * Probe-OUT, documented NOT pinned (failed at a DIFFERENT site, filed):
 *   named-tuple global init — cs checker loud-reject, ww accepts (#86)
 *   plain tagged global — cs silent-wrong, ww loud-reject (#87, not
 *   alias-family; control row fails)
 *
 *   row          | shape                                        | want
 *   -------------+----------------------------------------------+-----
 *   ctl_plain    | control: plain [4]int global r/w             | 0
 *   garr1_read   | alias arr 1-lvl, read first+LAST             | 0
 *   garr1_wr     | alias arr 1-lvl, write+read                  | 0
 *   garr_ord     | alias arr, type decl AFTER let               | 0
 *   garr2_read   | alias arr 2-LVL read (#78 saved-BP row)      | 0
 *   garr2_ordwr  | alias arr 2-lvl, order-permuted, w+r         | 0
 *   garr_u32     | alias [4]u32 w+r LAST (narrow esz anti-luck) | 0
 *   gsc2         | alias int 2-lvl r/w                          | 0
 *   gsc2_ord     | alias int 2-lvl read, decl-after-let         | 0
 *   gstr2        | alias str 2-lvl, len readback                | 0
 *   gflt2        | alias f64 2-lvl                              | 0
 *   gflt2_f32    | alias f32 2-lvl (load-width pin)             | 0
 *   gst1         | alias of named struct, field w/r (SEGV row)  | 0
 *   gst2         | alias-of-alias named struct                  | 0
 *   gstlit       | alias struct, STRUCTLIT init                 | 0
 *   gsl2         | alias slice 2-lvl, literal init + idx read   | 0
 *   gstrarr1     | alias [2]str 1-lvl (letpreintern label leg)  | 0
 *   gstrarr2     | alias [2]str 2-LVL                           | 0
 *   gdef_a2      | DEF: 2-lvl alias array, index read           | 0
 *   gdef_st      | DEF: alias struct, structlit + field read    | 0
 *   gdef_f2      | DEF: 2-lvl alias f64                         | 0
 *   hold_slice1  | alias global SLICE 1-lvl (pre-fold green)    | 0
 *   hold_elem    | alias ELEMENT type [2]row (batch-1 win)      | 0
 *
 * Values exceed 255 (no little-endian prefix-luck) and readbacks
 * assert the LAST element. Every row runs BOTH drivers and asserts
 * cstage/wwstage asm byte-identity. NNN<950, self-contained /tmp
 * sources, no imports (944 precedent).
 */
#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 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), cb = fgetc(fb);
		if (ca != cb) { rc = -1; break; }
		if (ca == EOF) break;
	}
	fclose(fa); fclose(fb);
	return rc;
}

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

static const struct row rows[] = {
	{ "ctl_plain",
	  "package main;\n"
	  "let g: [4]int = [1001: int, 1002: int, 1003: int, 1004: int];\n"
	  "export fn main() i32 = {\n"
	  "	if (g[3] != 1004) { return 1; };\n"
	  "	g[3] = 9999;\n"
	  "	if (g[3] != 9999) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0 },
	{ "garr1_read",
	  "package main;\n"
	  "type arr = [4]int;\n"
	  "let g: arr = [1001: int, 1002: int, 1003: int, 1004: int];\n"
	  "export fn main() i32 = {\n"
	  "	if (g[0] != 1001) { return 1; };\n"
	  "	if (g[3] != 1004) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0 },
	{ "garr1_wr",
	  "package main;\n"
	  "type arr = [4]int;\n"
	  "let g: arr = [1001: int, 1002: int, 1003: int, 1004: int];\n"
	  "export fn main() i32 = {\n"
	  "	g[3] = 8888;\n"
	  "	if (g[3] != 8888) { return 1; };\n"
	  "	if (g[2] != 1003) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0 },
	{ "garr_ord",
	  "package main;\n"
	  "let g: arr = [1001: int, 1002: int, 1003: int, 1004: int];\n"
	  "type arr = [4]int;\n"
	  "export fn main() i32 = {\n"
	  "	if (g[3] != 1004) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0 },
	/* #78 headline: pre-fix cs emitted NO DATA, never referenced
	 * main.g, and resolved g frame-local at offset 0 — LEAQ (BP) read
	 * the saved-BP word, exiting silently wrong. */
	{ "garr2_read",
	  "package main;\n"
	  "type arr = [4]int;\n"
	  "type arr2 = arr;\n"
	  "let g: arr2 = [1001: int, 1002: int, 1003: int, 1004: int];\n"
	  "export fn main() i32 = {\n"
	  "	if (g[0] != 1001) { return 1; };\n"
	  "	if (g[3] != 1004) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0 },
	{ "garr2_ordwr",
	  "package main;\n"
	  "let g: arr2 = [1001: int, 1002: int, 1003: int, 1004: int];\n"
	  "type arr2 = arr;\n"
	  "type arr = [4]int;\n"
	  "export fn main() i32 = {\n"
	  "	if (g[3] != 1004) { return 1; };\n"
	  "	g[1] = 7777;\n"
	  "	if (g[1] != 7777) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0 },
	{ "garr_u32",
	  "package main;\n"
	  "type au = [4]u32;\n"
	  "let g: au = [1001: u32, 1002: u32, 1003: u32, 1004: u32];\n"
	  "export fn main() i32 = {\n"
	  "	if (g[3] != 1004) { return 1; };\n"
	  "	g[3] = 8888;\n"
	  "	if (g[3] != 8888) { return 2; };\n"
	  "	if (g[2] != 1003) { return 3; };\n"
	  "	return 0;\n"
	  "};\n", 0 },
	{ "gsc2",
	  "package main;\n"
	  "type myint = int;\n"
	  "type myint2 = myint;\n"
	  "let g: myint2 = 4242;\n"
	  "export fn main() i32 = {\n"
	  "	if (g != 4242) { return 1; };\n"
	  "	g = 9999;\n"
	  "	if (g != 9999) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0 },
	{ "gsc2_ord",
	  "package main;\n"
	  "let g: myint2 = 4242;\n"
	  "type myint2 = myint;\n"
	  "type myint = int;\n"
	  "export fn main() i32 = {\n"
	  "	if (g != 4242) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0 },
	{ "gstr2",
	  "package main;\n"
	  "type ms = str;\n"
	  "type ms2 = ms;\n"
	  "let g: ms2 = \"hello\";\n"
	  "export fn main() i32 = {\n"
	  "	if (g.len != 5) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0 },
	{ "gflt2",
	  "package main;\n"
	  "type mf = f64;\n"
	  "type mf2 = mf;\n"
	  "let g: mf2 = 1.5;\n"
	  "export fn main() i32 = {\n"
	  "	if (g != 1.5) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0 },
	{ "gflt2_f32",
	  "package main;\n"
	  "type mg = f32;\n"
	  "type mg2 = mg;\n"
	  "let g: mg2 = 1.5f32;\n"
	  "export fn main() i32 = {\n"
	  "	if (g != 1.5f32) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0 },
	/* ONE user alias level sufficed to SEGV cs pre-fix: the named
	 * struct already costs the single peel, so `pt1 = pt` is two
	 * TY_NAMED layers at the decl. */
	{ "gst1",
	  "package main;\n"
	  "type pt = struct { x: int, y: int };\n"
	  "type pt1 = pt;\n"
	  "let g: pt1;\n"
	  "export fn main() i32 = {\n"
	  "	g.y = 2002;\n"
	  "	if (g.y != 2002) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0 },
	{ "gst2",
	  "package main;\n"
	  "type pt = struct { x: int, y: int };\n"
	  "type pt1 = pt;\n"
	  "type pt2 = pt1;\n"
	  "let g: pt2;\n"
	  "export fn main() i32 = {\n"
	  "	g.y = 2002;\n"
	  "	if (g.y != 2002) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0 },
	{ "gstlit",
	  "package main;\n"
	  "type pt = struct { x: int, y: int };\n"
	  "type pt1 = pt;\n"
	  "let g: pt1 = pt { x = 1001, y = 2002 };\n"
	  "export fn main() i32 = {\n"
	  "	if (g.y != 2002) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0 },
	{ "gsl2",
	  "package main;\n"
	  "type sl = []int;\n"
	  "type sl2 = sl;\n"
	  "let g: sl2 = [1001: int, 1002: int, 1003: int];\n"
	  "export fn main() i32 = {\n"
	  "	if (g.len != 3) { return 1; };\n"
	  "	if (g[2] != 1003) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0 },
	/* [N]str rows also pin letpreintern's chased array-leg gate: a
	 * missed pre-intern desyncs _S_ label order vs cstage (byte-id
	 * would catch it as a label-number diff). */
	{ "gstrarr1",
	  "package main;\n"
	  "type sa = [2]str;\n"
	  "let g: sa = [\"hello\", \"worlds!\"];\n"
	  "export fn main() i32 = {\n"
	  "	if (g[1].len != 7) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0 },
	{ "gstrarr2",
	  "package main;\n"
	  "type sa = [2]str;\n"
	  "type sa2 = sa;\n"
	  "let g: sa2 = [\"hello\", \"worlds!\"];\n"
	  "export fn main() i32 = {\n"
	  "	if (g[1].len != 7) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0 },
	{ "gdef_a2",
	  "package main;\n"
	  "type arr = [4]int;\n"
	  "type arr2 = arr;\n"
	  "def G: arr2 = [1001: int, 1002: int, 1003: int, 1004: int];\n"
	  "export fn main() i32 = {\n"
	  "	if (G[3] != 1004) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0 },
	{ "gdef_st",
	  "package main;\n"
	  "type pt = struct { x: int, y: int };\n"
	  "type pt1 = pt;\n"
	  "def G: pt1 = pt { x = 1001, y = 2002 };\n"
	  "export fn main() i32 = {\n"
	  "	if (G.y != 2002) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0 },
	{ "gdef_f2",
	  "package main;\n"
	  "type mf = f64;\n"
	  "type mf2 = mf;\n"
	  "def G: mf2 = 1.5;\n"
	  "export fn main() i32 = {\n"
	  "	if (G != 1.5) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0 },
	/* No-regression holds: alias global SLICE (green before this
	 * fold) and alias ELEMENT type (batch-1 win). */
	{ "hold_slice1",
	  "package main;\n"
	  "type sl = []int;\n"
	  "let g: sl = [1001: int, 1002: int, 1003: int];\n"
	  "export fn main() i32 = {\n"
	  "	if (g.len != 3) { return 1; };\n"
	  "	if (g[2] != 1003) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0 },
	{ "hold_elem",
	  "package main;\n"
	  "type row = [3]int;\n"
	  "let g: [2]row = [[1010: int, 1020: int, 1030: int], [1040: int, 1050: int, 1060: int]];\n"
	  "export fn main() i32 = {\n"
	  "	if (g[0][0] != 1010) { return 1; };\n"
	  "	if (g[1][2] != 1060) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0 },
};

static int
run_driver(const char *driver, const struct row *r, int i)
{
	char src[96], tmpdir[96], errf[96], cmd[1024];
	snprintf(src, sizeof src, "/tmp/agd_%d_%d.ww", getpid(), i);
	snprintf(tmpdir, sizeof tmpdir, "/tmp/agd_%d_d_%d", getpid(), i);
	snprintf(errf, sizeof errf, "/tmp/agd_%d_e_%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 && timeout 20 %s build %s >/dev/null 2>%s",
	    tmpdir, driver, src, errf);
	int brc = runwait(cmd);
	if (brc != 0) {
		fprintf(stderr, "row[%s]: build via %s failed\n",
		    r->label, driver);
		unlink(src); unlink(errf); rmdir(tmpdir);
		return -1;
	}

	const char *base = strrchr(src, '/');
	base = base ? base + 1 : src;
	char outbin[256];
	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); unlink(errf); rmdir(tmpdir);
	if (got != r->want) {
		fprintf(stderr, "row[%s]: %s exit %d, want %d\n",
		    r->label, driver, got, r->want);
		return 1;
	}
	return 0;
}

static int
asm_byte_identical(const char *bin, const struct row *r, int i)
{
	char src[96], cs[96], ws[96], cmd[1024];
	snprintf(src, sizeof src, "/tmp/agd_asm_%d_%d.ww", getpid(), i);
	snprintf(cs,  sizeof cs,  "/tmp/agd_asm_%d_%d_c.s", getpid(), i);
	snprintf(ws,  sizeof ws,  "/tmp/agd_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;
	}
	int rc = slurp_eq(cs, ws);
	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[2080];
	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[2120], wdrv[2120];
	snprintf(cdrv, sizeof cdrv, "%s/ww", bin);
	snprintf(wdrv, sizeof wdrv, "%s/ww_ww", bin);

	int n = (int)(sizeof rows / sizeof rows[0]);
	int total = 0, fail = 0;

	for (int i = 0; i < n; i++) {
		total++;
		if (run_driver(cdrv, &rows[i], i) != 0) fail++;
	}
	if (access(wdrv, X_OK) == 0) {
		for (int i = 0; i < n; i++) {
			total++;
			if (run_driver(wdrv, &rows[i], i) != 0) fail++;
		}
		for (int i = 0; i < n; i++) {
			total++;
			if (asm_byte_identical(bin, &rows[i], i) != 0) fail++;
		}
	}

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