Fix bugs and make improvements

- Get clone() working on FreeBSD
- Increase some Python build quotas
- Add more atomic builtins to chibicc
- Fix ASAN poisoning of alloca() memory
- Make MODE= mandatory link path tinier
- Improve the examples folder a little bit
- Start working on some more resource limits
- Make the linenoise auto-complete UI as good as GNU readline
- Update compile.com, avoiding AVX codegen on non-AVX systems
- Make sure empty path to syscalls like opendir raises ENOENT
- Correctly polyfill ENOENT vs. ENOTDIR on the New Technology
- Port bestline's paredit features to //third_party/linenoise
- Remove workarounds for RHEL 5.0 bugs that were fixed in 5.1

libc/intrin/tls.greg.c

@@ -0,0 +1,89 @@
+/*-*- 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 2022 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/assert.h"
+#include "libc/dce.h"
+#include "libc/intrin/tls.h"
+#include "libc/nt/thunk/msabi.h"
+
+__msabi extern typeof(TlsFree) *const __imp_TlsFree;
+__msabi extern typeof(TlsAlloc) *const __imp_TlsAlloc;
+__msabi extern typeof(TlsGetValue) *const __imp_TlsGetValue;
+__msabi extern typeof(TlsSetValue) *const __imp_TlsSetValue;
+
+/**
+ * Assigns thread-local storage slot.
+ *
+ * This function may for instance be called at startup and the result
+ * can be assigned to a global static variable; from then on, all the
+ * threads in your application may pass that value to TlsGetValue, to
+ * retrieve their thread-local values.
+ *
+ * @return index on success, or -1u w/ errno
+ * @threadsafe
+ */
+uint32_t TlsAlloc(void) {
+  return __imp_TlsAlloc();
+}
+
+/**
+ * Releases thread-local storage slot.
+ * @threadsafe
+ */
+bool32 TlsFree(uint32_t dwTlsIndex) {
+  return __imp_TlsFree(dwTlsIndex);
+}
+
+/**
+ * Sets value to thread-local storage slot.
+ *
+ * @param dwTlsIndex is something returned by TlsAlloc()
+ * @return true if successful, otherwise false
+ * @threadsafe
+ */
+bool32 TlsSetValue(uint32_t dwTlsIndex, void *lpTlsValue) {
+  assert(IsWindows());
+  if (dwTlsIndex < 64) {
+    asm("mov\t%1,%%gs:%0"
+        : "=m"(*((long *)0x1480 + dwTlsIndex))
+        : "r"(lpTlsValue));
+    return true;
+  } else {
+    return __imp_TlsSetValue(dwTlsIndex, lpTlsValue);
+  }
+}
+
+/**
+ * Retrieves value from thread-local storage slot.
+ *
+ * @param dwTlsIndex is something returned by TlsAlloc()
+ * @return true if successful, otherwise false
+ * @threadsafe
+ */
+void *TlsGetValue(uint32_t dwTlsIndex) {
+  void *lpTlsValue;
+  assert(IsWindows());
+  if (dwTlsIndex < 64) {
+    asm("mov\t%%gs:%1,%0"
+        : "=r"(lpTlsValue)
+        : "m"(*((long *)0x1480 + dwTlsIndex)));
+    return lpTlsValue;
+  } else {
+    return __imp_TlsGetValue(dwTlsIndex);
+  }
+}