Hojun-Cho
60e61315bc
wwstage's parsef64 (naive i64-accumulator + pow-10 fold) diverged from cstage's strtod: >19-digit mantissas overflowed the accumulator (sign-bit garbage), DBL_MIN was +1 ULP, DBL_MAX -2 ULP — the #59.10 ratchet pin. C-strtod oracle confirms cstage correctly rounded on every vector, so wwstage aligns to it by dogfooding strconv.stof64 (correctly-rounded decimal engine, already imported by lex.ww). Overflow literals now reject in both stages (stof64 overflow -> errat, mirroring ERANGE). Fix + #59.10 M_DIVERGE->M_ID graduation + pins land together per the ratchet's designed flow (the gate trips loud demanding graduation): oracle-pinned vectors in toktest.ww floatfold_cases (lexer-unit) and 989_floatlit_run (compiler fold: runtime bits + byte-id + overflow reject parity). Retained subnormal accept-set asymmetry filed as task #21, documented at the lexnum site.
206 lines
6.8 KiB
C
206 lines
6.8 KiB
C
/*
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* 989_floatlit_run — runtime + byte-id net for #62: the two stages
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* folded float LITERALS differently. cstage folds via strtod
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* (correctly rounded); the wwstage lexer used a pow-10 accumulation
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* fold that was 1-2 ULP off on decimal fractions, overflowed its i64
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* accumulator past 19 mantissa digits, and missed DBL_MIN/DBL_MAX by
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* up to 2 ULP — a pinned cs≠ww DATA divergence (989 ratchet #59.10).
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* Fix: lexnum folds through strconv.stof64 (the Hare-ported
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* correctly-rounded decimal engine).
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*
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* Fixture 1 (vectors): each row reads back a literal's IEEE bits via
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* a *u64 reinterpret and compares against the C-strtod-oracle bit
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* pattern; the exit code pinpoints the failing row. Carries (a)
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* cstage `ww build` + run asserting exit 0 (rule-10: convergence
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* targets the runtime-CORRECT side) and (b) w6c vs w6c_ww `.s` cmp
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* (byte-id — the wwstage fold itself).
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*
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* Fixture 2 (overflow): 1.7976931348623159e308 rounds above DBL_MAX —
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* strtod sets ERANGE so cstage rejects; wwstage must reject too
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* (stof64 overflow → errat). Both compilers must exit non-zero.
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*
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* Retained divergence (task #21): a SUBNORMAL literal (e.g.
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* 2.2250738585072011e-308) is rejected by cstage (glibc strtod flags
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* partial underflow with ERANGE) but accepted correctly-rounded by
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* wwstage (Hare stof semantics) — accept-set asymmetry only, not a
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* bits divergence; pre-existing on master (old parsef64 accepted it
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* with garbage bits).
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*
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* 9xx is full; shares the 989 prefix per the 989_sha256 precedent.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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static const char *vectors_src =
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"package main;\n"
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"fn bits(v: f64) u64 = {\n"
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" let x: f64 = v;\n"
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" let p: *u64 = (&x): *u64;\n"
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" return *p;\n"
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"};\n"
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"export fn main() i32 = {\n"
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" if (bits(1.0000000000000002) != 0x3FF0000000000001u64) { return 1; };\n"
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" if (bits(9007199254740993.0) != 0x4340000000000000u64) { return 2; };\n"
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" if (bits(1.2345e67) != 0x4DDD4E421712C0B7u64) { return 3; };\n"
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" if (bits(0.1) != 0x3FB999999999999Au64) { return 4; };\n"
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" if (bits(1.1) != 0x3FF199999999999Au64) { return 5; };\n"
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" if (bits(123456789012345678901234567890.0) != 0x45F8EE90FF6C373Eu64) { return 6; };\n"
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" if (bits(2.2250738585072014e-308) != 0x0010000000000000u64) { return 7; };\n"
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" if (bits(0.3) != 0x3FD3333333333333u64) { return 8; };\n"
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" if (bits(3.141592653589793) != 0x400921FB54442D18u64) { return 9; };\n"
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" if (bits(1.7976931348623157e308) != 0x7FEFFFFFFFFFFFFFu64) { return 10; };\n"
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" if (bits(1.7976931348623158e308) != 0x7FEFFFFFFFFFFFFFu64) { return 11; };\n"
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" if (bits(7.2057594037927933e16) != 0x4370000000000000u64) { return 12; };\n"
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" if (bits(1000000000000000000000.0) != 0x444B1AE4D6E2EF50u64) { return 13; };\n"
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" if (bits(1_000.5) != 0x408F440000000000u64) { return 14; };\n"
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" if (bits(1.00000000000000011102230246251565404236316680908203125) != 0x3FF0000000000000u64) { return 15; };\n"
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" if (bits(1.00000000000000011102230246251565404236316680908203126) != 0x3FF0000000000001u64) { return 16; };\n"
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" if (bits(4503599627370497.5) != 0x4330000000000002u64) { return 17; };\n"
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" if (bits(0.5) != 0x3FE0000000000000u64) { return 18; };\n"
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" if (bits(1.0e308) != 0x7FE1CCF385EBC8A0u64) { return 19; };\n"
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" if (bits(2.225073858507202e-308) != 0x0010000000000001u64) { return 20; };\n"
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" return 0;\n"
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"};\n";
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static const char *overflow_src =
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"package main;\n"
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"export fn main() i32 = {\n"
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" let a: f64 = 1.7976931348623159e308;\n"
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" return 0;\n"
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"};\n";
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static int
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runwait(const char *cmd)
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{
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int rc = system(cmd);
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if (rc == -1) return -1;
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if (WIFEXITED(rc)) return WEXITSTATUS(rc);
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return -1;
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}
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static int
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slurp_eq(const char *a, const char *b)
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{
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FILE *fa = fopen(a, "rb");
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FILE *fb = fopen(b, "rb");
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if (!fa || !fb) { if (fa) fclose(fa); if (fb) fclose(fb); return -1; }
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int rc = 0;
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for (;;) {
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int ca = fgetc(fa);
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int cb = fgetc(fb);
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if (ca != cb) { rc = -1; break; }
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if (ca == EOF) break;
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}
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fclose(fa); fclose(fb);
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return rc;
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}
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static int
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writesrc(const char *path, const char *src)
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{
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FILE *f = fopen(path, "wb");
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if (f == NULL) return -1;
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fputs(src, f);
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fclose(f);
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return 0;
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}
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int
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main(void)
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{
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const char *bin = getenv("BIN");
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if (!bin) bin = "out/bin";
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char absbin[1024];
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if (bin[0] != '/') {
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char cwd[1024];
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if (getcwd(cwd, sizeof cwd) == NULL) return 1;
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snprintf(absbin, sizeof absbin, "%s/%s", cwd, bin);
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bin = absbin;
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}
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char w6c[1100], w6c_ww[1100];
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snprintf(w6c, sizeof w6c, "%s/w6c", bin);
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snprintf(w6c_ww, sizeof w6c_ww, "%s/w6c_ww", bin);
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if (access(w6c_ww, X_OK) != 0) {
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fprintf(stderr, "floatlit: w6c_ww missing — cannot run "
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"the cs==ww byte-id gate (the whole point of this test)\n");
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return 1;
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}
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int fail = 0;
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char src[64], cmd[2048];
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/* fixture 1: vectors — cstage build+run, then byte-id */
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snprintf(src, sizeof src, "/tmp/wwflit_%d.ww", getpid());
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if (writesrc(src, vectors_src) != 0) return 1;
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char tmpdir[64];
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snprintf(tmpdir, sizeof tmpdir, "/tmp/wwflit_%d_d", getpid());
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mkdir(tmpdir, 0755);
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snprintf(cmd, sizeof cmd, "cd %s && %s/ww build %s", tmpdir, bin, src);
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if (runwait(cmd) != 0) {
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fprintf(stderr, "floatlit: cstage build failed\n");
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fail++;
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} else {
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char outbin[128];
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snprintf(outbin, sizeof outbin, "%s/wwflit_%d", tmpdir,
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getpid());
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int got = runwait(outbin);
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if (got != 0) {
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fprintf(stderr, "floatlit: vector row %d has wrong "
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"bits at runtime (cstage)\n", got);
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fail++;
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}
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unlink(outbin);
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}
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rmdir(tmpdir);
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char cs_s[64], ws_s[64];
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snprintf(cs_s, sizeof cs_s, "/tmp/wwflit_%d_cs.s", getpid());
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snprintf(ws_s, sizeof ws_s, "/tmp/wwflit_%d_ww.s", getpid());
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snprintf(cmd, sizeof cmd, "%s -o %s %s 2>/dev/null", w6c, cs_s, src);
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if (runwait(cmd) != 0) {
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fprintf(stderr, "floatlit: w6c failed on vectors\n");
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fail++;
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} else {
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snprintf(cmd, sizeof cmd, "%s -o %s %s 2>/dev/null",
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w6c_ww, ws_s, src);
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if (runwait(cmd) != 0) {
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fprintf(stderr, "floatlit: w6c_ww failed on vectors\n");
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fail++;
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} else if (slurp_eq(cs_s, ws_s) != 0) {
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fprintf(stderr, "floatlit: cstage/wwstage .s DIFFER "
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"(rule-10 byte-id violation)\n");
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fail++;
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}
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}
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unlink(src); unlink(cs_s); unlink(ws_s);
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/* fixture 2: overflow literal — BOTH stages must reject */
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snprintf(src, sizeof src, "/tmp/wwflit_%d_ovf.ww", getpid());
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if (writesrc(src, overflow_src) != 0) return 1;
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snprintf(cmd, sizeof cmd, "%s %s >/dev/null 2>&1", w6c, src);
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if (runwait(cmd) == 0) {
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fprintf(stderr, "floatlit: w6c ACCEPTED overflow literal\n");
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fail++;
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}
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snprintf(cmd, sizeof cmd, "%s %s >/dev/null 2>&1", w6c_ww, src);
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if (runwait(cmd) == 0) {
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fprintf(stderr, "floatlit: w6c_ww ACCEPTED overflow literal\n");
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fail++;
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}
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unlink(src);
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if (fail) {
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fprintf(stderr, "floatlit: %d check(s) failed\n", fail);
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return 1;
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}
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printf("floatlit: vectors byte-id + runtime-correct, "
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"overflow rejected by both stages\n");
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return 0;
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}
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