Make exciting improvements

- Add Lua backtraces to redbean!
- Wipe serving keys after redbean forks
- Audit redbean to remove free via exit
- Log SSL client ciphersuite preferences
- Increase ASAN malloc() backtrace depth
- Make GetSslRoots() behave as a singleton
- Move leaks.c from LIBC_TESTLIB to LIBC_LOG
- Add undocumented %n to printf() for newlines
- Fix redbean memory leak reindexing inode change
- Fix redbean memory leak with Fetch() DNS object
- Restore original environ after __cxa_finalize()
- Make backtrace always work after __cxa_finalize()
- Introduce COUNTEXPR() diagnostic / benchmark tool
- Fix a few more instances of errno being clobbered
- Consolidate the ANSI color disabling internal APIs

libc/log/countexpr_report.c

@@ -0,0 +1,82 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2021 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ Permission to use, copy, modify, and/or distribute this software for         │
+│ any purpose with or without fee is hereby granted, provided that the         │
+│ above copyright notice and this permission notice appear in all copies.      │
+│                                                                              │
+│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
+│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
+│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
+│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
+│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
+│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
+│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
+│ PERFORMANCE OF THIS SOFTWARE.                                                │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/alg/alg.h"
+#include "libc/assert.h"
+#include "libc/calls/calls.h"
+#include "libc/intrin/kprintf.h"
+#include "libc/limits.h"
+#include "libc/log/countexpr.h"
+#include "libc/macros.internal.h"
+#include "libc/runtime/runtime.h"
+#include "libc/stdio/stdio.h"
+
+static long GetLongSum(const long *h, size_t n) {
+  long t;
+  size_t i;
+  for (t = i = 0; i < n; ++i) {
+    if (__builtin_add_overflow(t, h[i], &t)) {
+      t = LONG_MAX;
+      break;
+    }
+  }
+  return t;
+}
+
+static size_t GetRowCount(const long *h, size_t n) {
+  while (n && !h[n - 1]) --n;
+  return n;
+}
+
+static void PrintHistogram(const long *h, size_t n, long t) {
+  size_t i;
+  long j, p;
+  char s[101];
+  unsigned long logos;
+  for (i = 0; i < n; ++i) {
+    p = (h[i] * 10000 + (t >> 1)) / t;
+    assert(0 <= p && p <= 10000);
+    if (p) {
+      for (j = 0; j < p / 100; ++j) s[j] = '#';
+      s[j] = 0;
+      logos = i ? 1ul << (i - 1) : 0;
+      kprintf("%'12lu %'16ld %3d.%02d%% %s%n", logos, h[i], p / 100, p % 100,
+              s);
+    }
+  }
+}
+
+void countexpr_report(void) {
+  long hits;
+  struct countexpr *p;
+  for (p = countexpr_data; p->line; ++p) {
+    if ((hits = GetLongSum(p->logos, 64))) {
+      kprintf("%s:%d: %s(%s) %'ld hits\n", p->file, p->line, p->macro, p->code,
+              hits);
+      PrintHistogram(p->logos, 64, hits);
+    }
+  }
+}
+
+static textstartup void countexpr_init() {
+  atexit(countexpr_report);
+}
+
+const void *const countexpr_ctor[] initarray = {
+    countexpr_init,
+};