ww/test/wcc/989_libprecond_abort.c

/*
 * 989_libprecond_abort (F-Q) — three lib functions had lost their Hare
 * loud-abort PRECONDITIONS, so an out-of-domain argument silently returned
 * garbage instead of aborting. This pins the restored asserts:
 *
 *   lib/math/random/random.ww  u32n  assert(n != 0)   ref/hare/.../random.ha:26
 *   lib/math/random/random.ww  u64n  assert(n != 0)   ref/hare/.../random.ha:42
 *   lib/encoding/base64/...    decodedsize  assert(sz % 4 == 0)  base64.ha:597
 *
 * Pre-fix every abort row BUILT rc=0 and RAN rc=0 (the precondition was
 * absent — silent garbage). The fix is a lib source change, source-bundled
 * into each build, so it takes effect identically on both stages with no
 * codegen change (byte-id NEUTRAL).
 *
 *   row                       | call                  | result (cs == ww)
 *   --------------------------+-----------------------+-------------------
 *   u32n_zero_abort           | u32n(&g, 0)           | run aborts (rc!=0)
 *   u32n_valid_ok             | u32n(&g, 10) in [0,10)| run rc == 0
 *   u32n_one_ok               | u32n(&g, 1)  in [0,1) | run rc == 0
 *   u64n_zero_abort           | u64n(&g, 0)           | run aborts (rc!=0)
 *   u64n_valid_ok             | u64n(&g, 10) in [0,10)| run rc == 0
 *   u64n_one_ok               | u64n(&g, 1)  in [0,1) | run rc == 0
 *   decodedsize_unalign_abort | decodedsize(5)        | run aborts (rc!=0)
 *   decodedsize_align_ok      | decodedsize(8) == 6   | run rc == 0
 *
 * The abort rows BUILD clean and abort at RUNTIME (unlike a reject row,
 * which fails the build) — this harness builds then runs each fixture and
 * checks the run exit, not the build exit. Rows run on cstage `ww` and,
 * when present, wwstage `ww_ww`; both must agree. Sibling idiom:
 * 989_taggedcompoundderef_reject.c (driver loop, /tmp fixture scaffolding).
 */
#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_abort;		/* 1 = run must abort (rc!=0); 0 = run rc==want_exit */
	int want_exit;
};

#define RNG_HDR \
	"package main;\n" \
	"import random;\n" \
	"export fn main() int = {\n" \
	"\tlet g: random.random = random.init(1u64);\n"

#define B64_HDR \
	"package main;\n" \
	"import base64;\n" \
	"export fn main() int = {\n"

static const struct row rows[] = {
	{ "u32n_zero_abort",
	  RNG_HDR "\tlet x: u32 = random.u32n(&g, 0u32);\n\treturn 0;\n};\n",
	  1, 0 },
	{ "u32n_valid_ok",
	  RNG_HDR "\tlet x: u32 = random.u32n(&g, 10u32);\n"
	  "\tif (x >= 10u32) { return 1; };\n\treturn 0;\n};\n",
	  0, 0 },
	{ "u32n_one_ok",		/* boundary: n=1 is the smallest VALID arg */
	  RNG_HDR "\tlet x: u32 = random.u32n(&g, 1u32);\n"
	  "\tif (x >= 1u32) { return 1; };\n\treturn 0;\n};\n",
	  0, 0 },
	{ "u64n_zero_abort",
	  RNG_HDR "\tlet x: u64 = random.u64n(&g, 0u64);\n\treturn 0;\n};\n",
	  1, 0 },
	{ "u64n_valid_ok",
	  RNG_HDR "\tlet x: u64 = random.u64n(&g, 10u64);\n"
	  "\tif (x >= 10u64) { return 1; };\n\treturn 0;\n};\n",
	  0, 0 },
	{ "u64n_one_ok",		/* boundary: n=1 is the smallest VALID arg */
	  RNG_HDR "\tlet x: u64 = random.u64n(&g, 1u64);\n"
	  "\tif (x >= 1u64) { return 1; };\n\treturn 0;\n};\n",
	  0, 0 },
	{ "decodedsize_unalign_abort",
	  B64_HDR "\tlet c: i32 = base64.decodedsize(5i32);\n\treturn 0;\n};\n",
	  1, 0 },
	{ "decodedsize_align_ok",
	  B64_HDR "\tlet c: i32 = base64.decodedsize(8i32);\n"
	  "\tif (c != 6i32) { return 1; };\n\treturn 0;\n};\n",
	  0, 0 },
};

/* Build `r->src` with `driver`, then run it. Returns the RUN exit code, or
 * -1 if the build failed (the harness treats a build miss as a hard error:
 * every row here must build clean — only the RUN may abort). `incs` is the
 * colon-free `-I a -I b ...` include flag string already composed by main. */
static int
build_and_run(const char *driver, const char *incs, const struct row *r, int i)
{
	char tmpdir[64], src[128], outbin[128], rmcmd[160], cmd[2048];
	snprintf(tmpdir, sizeof tmpdir, "/tmp/lpc_%d_d_%d", getpid(), i);
	mkdir(tmpdir, 0755);
	snprintf(src, sizeof src, "%s/lpc_%d_%d.ww", tmpdir, getpid(), i);
	snprintf(outbin, sizeof outbin, "%s/lpc_%d_%d", tmpdir, getpid(), i);
	snprintf(rmcmd, sizeof rmcmd, "rm -rf %s", tmpdir);

	FILE *f = fopen(src, "wb");
	if (!f) { runwait(rmcmd); return -2; }
	fputs(r->src, f);
	fclose(f);

	snprintf(cmd, sizeof cmd, "%s build -o %s %s %s 2>/dev/null",
	    driver, outbin, incs, src);
	int brc = runwait(cmd);

	int got = (brc == 0) ? runwait(outbin) : -1;

	runwait(rmcmd);
	return brc == 0 ? got : -1;
}

int
main(void)
{
	const char *bin = getenv("BIN");
	if (!bin) bin = "out/bin";
	char cwd[1024];
	if (getcwd(cwd, sizeof cwd) == NULL) return 1;
	char absbin[1024];
	if (bin[0] != '/') {
		snprintf(absbin, sizeof absbin, "%s/%s", cwd, bin);
		bin = absbin;
	}

	/* random lives at lib/math/random, base64 at lib/encoding/base64;
	 * the leaf-only imports resolve via these -I dirs (base64's own
	 * bytes/io/... deps resolve via the driver's default lib srcdir).
	 * Absolute so include resolution does not depend on the build cwd. */
	char incs[1024];
	snprintf(incs, sizeof incs, "-I %s/lib -I %s/lib/math -I %s/lib/encoding",
	    cwd, cwd, cwd);

	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 *drv; int gated; }
	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 && access(drivers[d].drv, X_OK) != 0) {
			fprintf(stderr, "libprecond_abort: skip %s (no %s)\n",
			    drivers[d].name, drivers[d].drv);
			continue;
		}
		for (int i = 0; i < n; i++) {
			total++;
			int got = build_and_run(drivers[d].drv, incs, &rows[i], i);
			if (rows[i].want_abort) {
				if (got == 0 || got < 0) {
					fprintf(stderr, "libprecond_abort[%s][%s]: run rc=%d, "
					    "expected a loud abort (rc!=0)%s\n",
					    drivers[d].name, rows[i].label, got,
					    got < 0 ? " [build failed]" : "");
					fail++;
				}
			} else {
				if (got != rows[i].want_exit) {
					fprintf(stderr, "libprecond_abort[%s][%s]: run rc=%d "
					    "want=%d\n", drivers[d].name, rows[i].label, got,
					    rows[i].want_exit);
					fail++;
				}
			}
		}
	}

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