Hojun-Cho
388ab8a707
TY_RUNE excluded — wwstage primsize skips it; task #5 will collapse both gates back to symmetric once type_isunsigned recurses TY_ENUM.
229 lines
6.3 KiB
C
229 lines
6.3 KiB
C
/*
|
|
* 640_int_cast_signed — signed narrow `(i64): i8|i16|i32` must
|
|
* sign-extend the narrowed value, not silently truncate. Each
|
|
* fixture casts a high-bit-set source to a narrow signed type,
|
|
* widens back to i64, and returns 42 on the expected match. A
|
|
* cast that fails to sign-extend leaks the low bits and the
|
|
* comparison falls through to the `0` arm.
|
|
*
|
|
* Exercises both stages via the user-facing `ww run` (cstage)
|
|
* and `ww_ww run` (wwstage) when present; the loop runs each
|
|
* driver in turn so a regression on either side is caught
|
|
* here without spawning extra targets.
|
|
*/
|
|
#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[] = {
|
|
/* i8 ← 0xFFFF_FF80: low byte is 0x80, expect -128 after
|
|
* narrow + widen-back round trip. */
|
|
{ "i8_high_bits_set",
|
|
"fn main() i32 = {\n"
|
|
" let x: i64 = 0xFFFFFF80i64;\n"
|
|
" let y: i8 = x: i8;\n"
|
|
" let z: i64 = y: i64;\n"
|
|
" if (z == -128i64) { return 42; };\n"
|
|
" return 0;\n"
|
|
"};\n",
|
|
42 },
|
|
/* i8 ← 0x80: bare low byte still encodes -128 once narrowed. */
|
|
{ "i8_low_byte_negative",
|
|
"fn main() i32 = {\n"
|
|
" let x: i64 = 0x80i64;\n"
|
|
" let y: i8 = x: i8;\n"
|
|
" let z: i64 = y: i64;\n"
|
|
" if (z == -128i64) { return 42; };\n"
|
|
" return 0;\n"
|
|
"};\n",
|
|
42 },
|
|
/* i8 ← 0x7F: positive, no sign-extend. */
|
|
{ "i8_positive_max",
|
|
"fn main() i32 = {\n"
|
|
" let x: i64 = 0x7Fi64;\n"
|
|
" let y: i8 = x: i8;\n"
|
|
" let z: i64 = y: i64;\n"
|
|
" if (z == 127i64) { return 42; };\n"
|
|
" return 0;\n"
|
|
"};\n",
|
|
42 },
|
|
/* i16 ← 0xFFFF_8000: low 16 bits encode -32768. */
|
|
{ "i16_high_bits_set",
|
|
"fn main() i32 = {\n"
|
|
" let x: i64 = 0xFFFF8000i64;\n"
|
|
" let y: i16 = x: i16;\n"
|
|
" let z: i64 = y: i64;\n"
|
|
" if (z == -32768i64) { return 42; };\n"
|
|
" return 0;\n"
|
|
"};\n",
|
|
42 },
|
|
/* i16 ← 0x8000: low half-word's sign bit alone. */
|
|
{ "i16_low_word_negative",
|
|
"fn main() i32 = {\n"
|
|
" let x: i64 = 0x8000i64;\n"
|
|
" let y: i16 = x: i16;\n"
|
|
" let z: i64 = y: i64;\n"
|
|
" if (z == -32768i64) { return 42; };\n"
|
|
" return 0;\n"
|
|
"};\n",
|
|
42 },
|
|
/* i32 ← 0xFFFFFFFF_80000000: low 32 bits encode INT32_MIN. */
|
|
{ "i32_high_bits_set",
|
|
"fn main() i32 = {\n"
|
|
" let x: i64 = -2147483648i64;\n"
|
|
" let y: i32 = x: i32;\n"
|
|
" let z: i64 = y: i64;\n"
|
|
" if (z == -2147483648i64) { return 42; };\n"
|
|
" return 0;\n"
|
|
"};\n",
|
|
42 },
|
|
/* i32 ← 0x0000_0000_8000_0000: low dword's sign bit alone. */
|
|
{ "i32_low_dword_negative",
|
|
"fn main() i32 = {\n"
|
|
" let x: i64 = 0x80000000i64;\n"
|
|
" let y: i32 = x: i32;\n"
|
|
" let z: i64 = y: i64;\n"
|
|
" if (z == -2147483648i64) { return 42; };\n"
|
|
" return 0;\n"
|
|
"};\n",
|
|
42 },
|
|
/* Compare against the narrow target's own range, not the
|
|
* widened slot — i32 - 1 must roll over to INT32_MAX after
|
|
* MOVSXD sign-extends the wrap-around value. */
|
|
{ "i32_wrap_negative_to_positive",
|
|
"fn main() i32 = {\n"
|
|
" let x: i64 = 0x80000000i64;\n"
|
|
" let y: i32 = (x - 1i64): i32;\n"
|
|
" let z: i64 = y: i64;\n"
|
|
" if (z == 2147483647i64) { return 42; };\n"
|
|
" return 0;\n"
|
|
"};\n",
|
|
42 },
|
|
/* `!T` error-flag wrapper must not block the narrow clamp.
|
|
* Pins the wwstage N_TBANG peel in cgcast: without it, the
|
|
* unsigned u8 mask was skipped and 0x1FF leaked through. */
|
|
{ "u8bang_unsigned_narrow",
|
|
"type u8x = !u8;\n"
|
|
"fn main() i32 = {\n"
|
|
" let y: u8x = 0x1FFu64: u8x;\n"
|
|
" let z: u64 = y: u64;\n"
|
|
" if (z == 0xFFu64) { return 42; };\n"
|
|
" return 0;\n"
|
|
"};\n",
|
|
42 },
|
|
/* Signed `!T` companion — sign-extend must fire through the
|
|
* bang wrapper so `(0xFF80): !i8 → i64` reads back -128. */
|
|
{ "i8bang_signed_narrow",
|
|
"type i8x = !i8;\n"
|
|
"fn main() i32 = {\n"
|
|
" let y: i8x = 0xFF80i64: i8x;\n"
|
|
" let z: i64 = y: i64;\n"
|
|
" if (z == -128i64) { return 42; };\n"
|
|
" return 0;\n"
|
|
"};\n",
|
|
42 },
|
|
};
|
|
|
|
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/wwic_%d_%d.ww", getpid(), i);
|
|
snprintf(tmpdir, sizeof tmpdir, "/tmp/wwic_%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",
|
|
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;
|
|
}
|
|
|
|
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, "int_cast_signed: 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,
|
|
"int_cast_signed[%s][%s]: exit=%d want=%d\n",
|
|
drivers[d].name, rows[i].label,
|
|
got, rows[i].want);
|
|
fail++;
|
|
}
|
|
}
|
|
}
|
|
if (fail) {
|
|
fprintf(stderr,
|
|
"int_cast_signed: %d/%d fixtures failed\n", fail, total);
|
|
return 1;
|
|
}
|
|
printf("int_cast_signed: %d/%d ok\n", total, total);
|
|
return 0;
|
|
}
|