/*
 * 949_dotbase_addr_slice_run — runtime + byte-id net for #252, the
 * addr-of + slice SIBLING of #135 (949_dotbase_arr_run covers the
 * read/write index path). Taking `&x.o[i]` (address-of an element) or
 * slicing `x.o[lo:hi]` / `x.o[lo:]` of a struct's `[N]T`-typed FIELD
 * computed the field's VALUE as the base address instead of its
 * ADDRESS: cgen emitted `MOVL off(BP),AX` (load the field's first
 * 8 bytes as a pointer) where it must emit `LEAQ off(BP),AX` (the
 * field's address) -> garbage pointer -> SEGFAULT. The index
 * read/write path was fixed in #135; the addr-of N_INDEX "complex
 * base" arm and the N_SLICE base arm still fell to the generic
 * cgexpr(base) auto-deref. cs==ww BOTH stages broken identically
 * pre-fix (gate-blind, pure correctness — not a byte-id divergence).
 *
 * Fix wires the same `cg_dotbase_addr` (cstage) / `dotbaseaddr`
 * (wwstage) helper #135 introduced into those two base-address paths
 * (guarded `if(!cg_dotbase_addr(...)) cgexpr(base)`). For the slice
 * path the element stride (esz) and default-hi length are extended to
 * an N_DOT array-field base too (read from the field's element tinfo /
 * array length via the type table — rule-13), so non-u8 element slices
 * scale correctly and `s.obuf[lo:]` gets the array's element count.
 *
 * Rows (cstage `ww build` + run for exit code; w6c vs w6c_ww `.s` cmp
 * for rule-10 byte-id):
 *   - addr_local_u8   &x.o[1] on a local value-struct, *p read   → 66
 *   - addr_ptr_u8     &x.o[2] via a *struct param, *p read       → 77
 *   - addr_i32        &x.o[2] on [4]i32 field, *p read (esz=4)   → 88
 *   - slice_u8_expl   x.o[1:4] explicit hi, s[0] read            → 66
 *   - slice_u8_dflthi x.o[1:]  default hi,  s[0] read            → 66
 *   - slice_ptr_u8    x.o[1:4] via a *struct param, s[0] read    → 66
 *   - slice_i32_expl  [4]i32 field x.o[1:3], s[1] read (esz=4)   → 88
 *   - slice_i32_dflt  [4]i32 field x.o[1:],  s[2] read (esz=4)   → 55
 *   - control_bare    bare-local [4]u8 &a[1] write + a[1:4] read → 44
 *
 * The bare-local control asserts the N_IDENT base paths (untouched by
 * this fix) still emit correct code; the non-u8 rows assert the esz
 * stride extension is wired (not silently esz=1).
 */
#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_exit; };

static const struct row rows[] = {
	{ "addr_local_u8",
	  "package main;\n"
	  "type e = struct { o: [4]u8 };\n"
	  "export fn main() i32 = {\n"
	  "	let x: e;\n"
	  "	x.o[1] = 66u8;\n"
	  "	let p: *u8 = &x.o[1];\n"
	  "	return (*p): i32;\n"
	  "};\n", 66 },
	{ "addr_ptr_u8",
	  "package main;\n"
	  "type e = struct { o: [4]u8 };\n"
	  "fn rd(x: *e) u8 = { let p: *u8 = &x.o[2]; return *p; };\n"
	  "export fn main() i32 = {\n"
	  "	let x: e;\n"
	  "	x.o[2] = 77u8;\n"
	  "	return rd(&x): i32;\n"
	  "};\n", 77 },
	{ "addr_i32",
	  "package main;\n"
	  "type e = struct { o: [4]i32 };\n"
	  "export fn main() i32 = {\n"
	  "	let x: e;\n"
	  "	x.o[2] = 88;\n"
	  "	let p: *i32 = &x.o[2];\n"
	  "	return *p;\n"
	  "};\n", 88 },
	{ "slice_u8_expl",
	  "package main;\n"
	  "type e = struct { o: [4]u8 };\n"
	  "export fn main() i32 = {\n"
	  "	let x: e;\n"
	  "	x.o[1] = 66u8;\n"
	  "	let s: []u8 = x.o[1:4];\n"
	  "	return s[0]: i32;\n"
	  "};\n", 66 },
	{ "slice_u8_dflthi",
	  "package main;\n"
	  "type e = struct { o: [4]u8 };\n"
	  "export fn main() i32 = {\n"
	  "	let x: e;\n"
	  "	x.o[1] = 66u8;\n"
	  "	let s: []u8 = x.o[1:];\n"
	  "	return s[0]: i32;\n"
	  "};\n", 66 },
	{ "slice_ptr_u8",
	  "package main;\n"
	  "type e = struct { o: [4]u8 };\n"
	  "fn sl(x: *e) u8 = { let s: []u8 = x.o[1:4]; return s[0]; };\n"
	  "export fn main() i32 = {\n"
	  "	let x: e;\n"
	  "	x.o[1] = 66u8;\n"
	  "	return sl(&x): i32;\n"
	  "};\n", 66 },
	{ "slice_i32_expl",
	  "package main;\n"
	  "type e = struct { o: [4]i32 };\n"
	  "export fn main() i32 = {\n"
	  "	let x: e;\n"
	  "	x.o[1] = 99;\n"
	  "	x.o[2] = 88;\n"
	  "	let s: []i32 = x.o[1:3];\n"
	  "	return s[1];\n"
	  "};\n", 88 },
	{ "slice_i32_dflt",
	  "package main;\n"
	  "type e = struct { o: [4]i32 };\n"
	  "export fn main() i32 = {\n"
	  "	let x: e;\n"
	  "	x.o[3] = 55;\n"
	  "	let s: []i32 = x.o[1:];\n"
	  "	return s[2];\n"
	  "};\n", 55 },
	{ "control_bare",
	  "package main;\n"
	  "export fn main() i32 = {\n"
	  "	let a: [4]u8;\n"
	  "	a[2] = 44u8;\n"
	  "	let p: *u8 = &a[1];\n"
	  "	*p = 33u8;\n"
	  "	let s: []u8 = a[1:4];\n"
	  "	return s[1]: i32;\n"
	  "};\n", 44 },
	{ 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, "dotbaseaddr: w6c_ww missing — cannot run the "
		    "cs==ww byte-id gate (the whole point of this test)\n");
		return 1;
	}

	int n = 0, fail = 0;
	for (int i = 0; rows[i].src; i++, n++) {
		char src[64];
		snprintf(src, sizeof src, "/tmp/wwdbs_%d_%d.ww", getpid(), i);
		FILE *f = fopen(src, "wb");
		if (f == NULL) { fail++; continue; }
		fputs(rows[i].src, f);
		fclose(f);

		char tmpdir[64];
		snprintf(tmpdir, sizeof tmpdir, "/tmp/wwdbs_%d_d_%d",
		    getpid(), i);
		mkdir(tmpdir, 0755);

		char cmd[2048];
		snprintf(cmd, sizeof cmd, "cd %s && %s/ww build %s",
		    tmpdir, bin, src);
		if (runwait(cmd) != 0) {
			fprintf(stderr, "row[%s]: cstage build failed\n",
			    rows[i].label);
			fail++;
			unlink(src); rmdir(tmpdir);
			continue;
		}

		char outbin[128];
		const char *base = strrchr(src, '/');
		base = base ? base + 1 : src;
		snprintf(outbin, sizeof outbin, "%s/%s", tmpdir, base);
		char *dot = strrchr(outbin, '.');
		if (dot && strcmp(dot, ".ww") == 0) *dot = '\0';

		int got = runwait(outbin);
		if (got != rows[i].want_exit) {
			fprintf(stderr, "row[%s]: cstage exit %d, want %d\n",
			    rows[i].label, got, rows[i].want_exit);
			fail++;
		}
		unlink(outbin); rmdir(tmpdir);

		char cs_s[64], ws_s[64];
		snprintf(cs_s, sizeof cs_s, "/tmp/wwdbs_%d_%d_cs.s",
		    getpid(), i);
		snprintf(ws_s, sizeof ws_s, "/tmp/wwdbs_%d_%d_ww.s",
		    getpid(), i);

		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++; unlink(src); 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++; unlink(src); unlink(cs_s); continue;
		}
		if (slurp_eq(cs_s, ws_s) != 0) {
			fprintf(stderr,
			    "row[%s]: cstage/wwstage .s DIFFER (rule-10 "
			    "byte-id violation)\n", rows[i].label);
			fail++;
		}
		unlink(src); unlink(cs_s); unlink(ws_s);
	}

	if (fail) {
		fprintf(stderr, "%d/%d dotbase-addr-slice tests failed\n",
		    fail, n);
		return 1;
	}
	printf("dotbaseaddr: %d/%d ok (cstage run + cs==ww byte-id)\n",
	    n, n);
	return 0;
}