ww/test/wcc/833_inferred_array_global.c

/*
 * 833_inferred_array_global — an inferred-type (annotation-less) module-global
 * `let xs = [10, 20, 30];` whose init is an ARRAY literal must compile and run
 * exactly as the explicit-typed `let xs: [3]int = [10, 20, 30]` does. The
 * array twin of #135/#150-B (inferred float / inferred scalar global).
 * WWSTAGE-ONLY bug (cstage already correct post-#150-B).
 *
 * Root (selfhost/cmd/wcc/check.ww exprtype N_ARRLIT, ~3294): for an inferred
 * array let, exprtype synthesizes the array type — an N_TARRAY whose lhs is
 * the element TNAME and whose rhs is a fresh N_INTLIT count node — and stamps
 * e.type_ and arr.type_, but NEVER the count node's type_. checkletassign
 * plants this synthesized arr on the inferred let's n.lhs; the pass-3
 * asserttyped walker then descends arr.rhs (the count N_INTLIT, an expr kind)
 * with type_ == nil and trips `asserttyped: int` — a HARD loud build failure.
 * wwstage could not compile an inferred array global at all. An explicit
 * `[3]int` works because resolvewalk stamps its parser-built count node.
 *
 * The fix (check.ww, checker-only): stamp the synthesized count node's type_.
 * The element TNAME needs no stamp (N_TNAME is not an asserttyped expr kind).
 * cgen reads arr.rhs.uval, so the stamp is byte-id-inert: once the checker
 * accepts the inferred array identically to an explicit one, the existing
 * [N]T-global cgen path emits the IDENTICAL `.s`. cstage is UNTOUCHED.
 *
 *   row        | shape                                       | want
 *   -----------+---------------------------------------------+-----
 *   int_idx    | let xs = [10,20,30]; xs[1]   (the bug)       | 20
 *   int_len    | let xs = [10,20,30]; xs.len                  | 3
 *   u8_elem    | let bs = [1u8,2u8,3u8]; bs[2] (narrow elem)  | 3
 *   ctrl_expl  | let xs: [3]int = [10,20,30]; xs[1] (explicit)| 20
 *
 * Pre-fix the inferred rows ran wwstage=LOUD (asserttyped exit 1) and
 * cstage=correct (cs≠ww); post-fix all four run in both stages and the
 * inferred rows' `.s` is byte-identical between stages (and to the explicit
 * form). ctrl_expl guards the explicit-[N]T path didn't regress and is the
 * byte-id reference the inferred rows must match.
 */
#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[] = {
	/* int_idx — the bug: inferred array global indexed, cast to int.
	 * Pre-fix wwstage tripped asserttyped (exit 1); cstage 20. */
	{ "int_idx",
	  "package main;\n"
	  "let xs = [10, 20, 30];\n"
	  "export fn main() i32 = {\n"
	  "\treturn xs[1]: i32;\n"
	  "};\n",
	  20 },

	/* int_len — inferred array global .len pseudo-field read. */
	{ "int_len",
	  "package main;\n"
	  "let xs = [10, 20, 30];\n"
	  "export fn main() i32 = {\n"
	  "\treturn xs.len: i32;\n"
	  "};\n",
	  3 },

	/* u8_elem — narrow (u8-default) element; the synthesized element
	 * type defaults to u8 here, exercising a non-int stride. */
	{ "u8_elem",
	  "package main;\n"
	  "let bs = [1u8, 2u8, 3u8];\n"
	  "export fn main() i32 = {\n"
	  "\treturn bs[2]: i32;\n"
	  "};\n",
	  3 },

	/* ctrl_expl — explicit [3]int annotation; already worked. The
	 * byte-id reference the inferred int rows must match. No-regress. */
	{ "ctrl_expl",
	  "package main;\n"
	  "let xs: [3]int = [10, 20, 30];\n"
	  "export fn main() i32 = {\n"
	  "\treturn xs[1]: i32;\n"
	  "};\n",
	  20 },
};

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