ww/test/wcc/989_trycallcollide_run.c

/*
 * 989_trycallcollide_run (#11a, c3) — exprtypeoftry must prefer the current
 * module's symbol when typing a `?`/`!` operand whose bare leaf collides with
 * a same-leaf decl in a later module.
 *
 * THE BUG (review item #11, 2026-06-11): exprtypeoftry (check.ww ~5850 N_IDENT,
 * ~5874 N_CALL bare-leaf callee) typed the try operand with bare scopelookup —
 * no (name,module) preference. scopedefineinmodule PREPENDS, so a later
 * module's same-leaf decl heads the chain and the operand is typed against ITS
 * signature. For `op()?` the wrong op's error subset is then checked against
 * the enclosing fn's return: a spurious "?: error variant not in enclosing
 * return" rejects valid code (or, with a narrower foreign subset, silently
 * skips the F8 multi-success reject). cstage types the operand via cexpr with
 * cur_mod. THE FIX: both arms use scopelookupprefer(c.cur, c.curmod, ...),
 * mirroring exprtype's own N_IDENT/N_CALL arms (:2897/:3336).
 *
 * GATING NOTE: this swap broke 995_self_rebuild once in a CONTAMINATED earlier
 * attempt (bundled with a u64-guard-buggy scopelookuptype). Re-probed clean
 * atop c1 (i32-correct scopelookuptype): repro closes AND 990-997/995 green.
 *
 *   row        | shape                                       | run (cs==ww)
 *   -----------+---------------------------------------------+-------------
 *   callcollide| beta.user() does `op()?`; gamma also has    | 42 (was ww
 *              |  `op` with a wider error subset             |  build-fail)
 *   noclash    | same, gamma.op renamed (no collision)       | 42 (control)
 *
 * The N_DOT-callee module-keyed resolution stays task #51 (out of scope).
 * Single-file multi-package source is the sanctioned shape (cmd/ww/main.c).
 */
#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[] = {
	{ "callcollide",
	  "package beta;\n"
	  "export type berr = !void;\n"
	  "export fn op() (i32 | berr) = { return 5; };\n"
	  "export fn user() (i32 | berr) = {\n"
	  "	let v: i32 = op()?;\n"
	  "	return v + 37;\n"
	  "};\n"
	  "package gamma;\n"
	  "export type gerr1 = !void;\n"
	  "export type gerr2 = !u8;\n"
	  "export fn op() (i32 | gerr1 | gerr2) = { return 0; };\n"
	  "package main;\n"
	  "import beta;\n"
	  "import gamma;\n"
	  "fn main() int = {\n"
	  "	match (beta.user()) {\n"
	  "	case let n: i32 => return n: int;\n"
	  "	case berr => return 99;\n"
	  "	};\n"
	  "};\n",
	  42 },

	{ "noclash",
	  "package beta;\n"
	  "export type berr = !void;\n"
	  "export fn op() (i32 | berr) = { return 5; };\n"
	  "export fn user() (i32 | berr) = {\n"
	  "	let v: i32 = op()?;\n"
	  "	return v + 37;\n"
	  "};\n"
	  "package gamma;\n"
	  "export type gerr1 = !void;\n"
	  "export fn other() (i32 | gerr1) = { return 0; };\n"
	  "package main;\n"
	  "import beta;\n"
	  "import gamma;\n"
	  "fn main() int = {\n"
	  "	match (beta.user()) {\n"
	  "	case let n: i32 => return n: int;\n"
	  "	case berr => return 99;\n"
	  "	};\n"
	  "};\n",
	  42 },
};

static int
run_build(const char *driver, const struct row *r, int i)
{
	char src[64], tmpdir[64], cmd[1024];
	snprintf(src, sizeof src, "/tmp/tcc_%d_%d.ww", getpid(), i);
	snprintf(tmpdir, sizeof tmpdir, "/tmp/tcc_%d_d_%d", getpid(), i);

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

	mkdir(tmpdir, 0755);
	snprintf(cmd, sizeof cmd, "cd %s && %s build %s 2>/dev/null",
	    tmpdir, driver, src);
	int brc = runwait(cmd);

	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 = -1;
	if (brc == 0) got = runwait(outbin);

	unlink(src); unlink(outbin); rmdir(tmpdir);
	return brc == 0 ? got : -1;	/* -1 == build failed */
}

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], wdrv[1024];
	snprintf(cdrv, sizeof cdrv, "%s/ww", bin);
	snprintf(wdrv, sizeof wdrv, "%s/ww_ww", bin);
	int have_ww = (access(wdrv, X_OK) == 0);

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

	for (int i = 0; i < n; i++) {
		total++;
		int gc = run_build(cdrv, &rows[i], i);
		if (gc != rows[i].want) {
			fprintf(stderr, "trycallcollide[cstage][%s]: got=%d want=%d\n",
			    rows[i].label, gc, rows[i].want);
			fail++;
		}
		if (!have_ww) {
			fprintf(stderr, "trycallcollide: skip wwstage (no %s)\n", wdrv);
			continue;
		}
		int gw = run_build(wdrv, &rows[i], i);
		if (gw != gc) {
			fprintf(stderr, "trycallcollide[%s]: cs=%d != ww=%d "
			    "(exprtypeoftry cross-module try-operand misbind — #11a c3)\n",
			    rows[i].label, gc, gw);
			fail++;
		}
		if (gw != rows[i].want) {
			fprintf(stderr, "trycallcollide[wwstage][%s]: got=%d want=%d\n",
			    rows[i].label, gw, rows[i].want);
			fail++;
		}
	}

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