Bring back gc() function

Renaming gc() to _gc() was a mistake since the better thing to do is put
it behind the _COSMO_SOURCE macro. We need this change because I haven't
wanted to use my amazing garbage collector ever since we renamed it. You
now need to define _COSMO_SOURCE yourself when using amalgamation header
and cosmocc users need to pass the -mcosmo flag to get the gc() function

Some other issues relating to cancelation have been fixed along the way.
We're also now putting cosmocc in a folder named `.cosmocc` so it can be
more safely excluded by grep --exclude-dir=.cosmocc --exclude-dir=o etc.

third_party/bzip2/blocksort.c

@@ -19,7 +19,7 @@
    ------------------------------------------------------------------ */
 
 
-#include "libc/mem/gc.internal.h"
+#include "libc/mem/gc.h"
 #include "libc/mem/mem.h"
 #include "third_party/bzip2/bzlib_private.inc"
 

third_party/bzip2/bzip2.c

@@ -4,7 +4,7 @@
 #include "libc/calls/struct/stat.macros.h"
 #include "libc/errno.h"
 #include "libc/log/log.h"
-#include "libc/mem/gc.internal.h"
+#include "libc/mem/gc.h"
 #include "libc/mem/mem.h"
 #include "libc/runtime/runtime.h"
 #include "libc/stdio/stdio.h"

third_party/bzip2/huffman.c

@@ -19,7 +19,7 @@
    ------------------------------------------------------------------ */
 
 
-#include "libc/mem/gc.internal.h"
+#include "libc/mem/gc.h"
 #include "libc/mem/mem.h"
 #include "third_party/bzip2/bzlib_private.inc"
 

third_party/chibicc/chibicc.c

@@ -4,7 +4,7 @@
 #include "libc/calls/struct/siginfo.h"
 #include "libc/calls/ucontext.h"
 #include "libc/fmt/libgen.h"
-#include "libc/mem/gc.internal.h"
+#include "libc/mem/gc.h"
 #include "libc/runtime/runtime.h"
 #include "libc/sysv/consts/sig.h"
 #include "libc/x/xasprintf.h"

third_party/chibicc/dox1.c

@@ -107,15 +107,15 @@ static char *DescribeType(struct Type *ty) {
     case TY_LDOUBLE:
       return DescribeScalar(ty, "long double");
     case TY_FUNC:
-      return xasprintf("%s(*)()", _gc(DescribeType(ty->return_ty)));
+      return xasprintf("%s(*)()", gc(DescribeType(ty->return_ty)));
     case TY_PTR:
       if (ty->base->kind == TY_FUNC) {
         return DescribeType(ty->base);
       } else {
-        return xasprintf("%s*", _gc(DescribeType(ty->base)));
+        return xasprintf("%s*", gc(DescribeType(ty->base)));
       }
     case TY_ARRAY:
-      return xasprintf("%s[%d]", _gc(DescribeType(ty->base)), ty->array_len);
+      return xasprintf("%s[%d]", gc(DescribeType(ty->base)), ty->array_len);
     case TY_ENUM:
       if (ty->name) {
         return xasprintf("enum %.*s", ty->name->len, ty->name->loc);

third_party/chibicc/pybind.c

@@ -538,7 +538,7 @@ const struct _inittab _PyImport_Inittab_%s = {\n\
 };\n\
 ",
           module, module,
-          tok->file->javadown ? _gc(xasprintf("pb_%s_doc", module)) : "0",
+          tok->file->javadown ? gc(xasprintf("pb_%s_doc", module)) : "0",
           module, module, module, module, module, module);
   CHECK_NE(-1, (fd = creat(path, 0644)));
   CHECK_NE(-1, xwrite(fd, b, appendz(b).i));

third_party/hiredis/hiredis.c

@@ -976,7 +976,7 @@ redisPushFn *redisSetPushCallback(redisContext *c, redisPushFn *fn) {
  * After this function is called, you may use redisGetReplyFromReader to
  * see if there is a reply available. */
 int redisBufferRead(redisContext *c) {
-    char *buf = _gc(malloc(1024*16));
+    char *buf = gc(malloc(1024*16));
     int nread;
 
     /* Return early when the context has seen an error. */

third_party/lua/ldo.c

@@ -86,14 +86,14 @@ asm(".include \"libc/disclaimer.inc\"");
 #elif defined(LUA_USE_POSIX)				/* }{ */
 
 /* in POSIX, try _longjmp/_setjmp (more efficient) */
-#define LUAI_THROW(L,c)		_gclongjmp((c)->b, 1)
+#define LUAI_THROW(L,c)		gclongjmp((c)->b, 1)
 #define LUAI_TRY(L,c,a)		if (_setjmp((c)->b) == 0) { a }
 #define luai_jmpbuf		jmp_buf
 
 #else							/* }{ */
 
 /* ISO C handling with long jumps */
-#define LUAI_THROW(L,c)		_gclongjmp((c)->b, 1)
+#define LUAI_THROW(L,c)		gclongjmp((c)->b, 1)
 #define LUAI_TRY(L,c,a)		if (setjmp((c)->b) == 0) { a }
 #define luai_jmpbuf		jmp_buf
 

third_party/lua/ltests.c

@@ -1262,7 +1262,7 @@ static int panicback (lua_State *L) {
   b = (struct Aux *)lua_touserdata(L, -1);
   lua_pop(L, 1);  /* remove 'Aux' struct */
   runC(b->L, L, b->paniccode);  /* run optional panic code */
-  _gclongjmp(b->jb, 1);
+  gclongjmp(b->jb, 1);
   return 1;  /* to avoid warnings */
 }
 

third_party/lua/luaencodejsondata.c

@@ -22,7 +22,7 @@
 #include "libc/intrin/likely.h"
 #include "libc/log/log.h"
 #include "libc/log/rop.internal.h"
-#include "libc/mem/gc.internal.h"
+#include "libc/mem/gc.h"
 #include "libc/mem/mem.h"
 #include "libc/runtime/runtime.h"
 #include "libc/runtime/stack.h"

third_party/musl/crypt_blowfish.c

@@ -29,7 +29,7 @@
 #include "libc/limits.h"
 #include "libc/literal.h"
 #include "libc/mem/mem.h"
-#include "libc/mem/gc.internal.h"
+#include "libc/mem/gc.h"
 #include "libc/str/str.h"
 #include "third_party/musl/crypt.internal.h"
 

third_party/python/Modules/_decimal/libmpdec/transpose.c

@@ -28,7 +28,7 @@
 │ EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.                           │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "third_party/python/Modules/_decimal/libmpdec/transpose.h"
-#include "libc/mem/gc.internal.h"
+#include "libc/mem/gc.h"
 #include "libc/mem/mem.h"
 #include "third_party/python/Modules/_decimal/libmpdec/bits.h"
 #include "third_party/python/Modules/_decimal/libmpdec/constants.h"

third_party/python/Modules/_threadmodule.c

@@ -27,7 +27,7 @@
 #include "libc/errno.h"
 #include "libc/log/log.h"
 #include "libc/mem/alg.h"
-#include "libc/mem/gc.internal.h"
+#include "libc/mem/gc.h"
 #include "libc/nt/createfile.h"
 #include "libc/nt/dll.h"
 #include "libc/nt/enum/creationdisposition.h"

third_party/python/Modules/getpath.c

@@ -11,7 +11,7 @@
 #include "libc/intrin/cmpxchg.h"
 #include "libc/log/log.h"
 #include "libc/mem/alloca.h"
-#include "libc/mem/gc.internal.h"
+#include "libc/mem/gc.h"
 #include "libc/mem/mem.h"
 #include "libc/runtime/runtime.h"
 #include "libc/str/str.h"

third_party/python/Modules/posixmodule.c

@@ -29,7 +29,7 @@
 #include "libc/errno.h"
 #include "libc/log/log.h"
 #include "libc/mem/alg.h"
-#include "libc/mem/gc.internal.h"
+#include "libc/mem/gc.h"
 #include "libc/nt/createfile.h"
 #include "libc/nt/dll.h"
 #include "libc/nt/enum/creationdisposition.h"

third_party/python/Modules/selectmodule.c

@@ -7,7 +7,7 @@
 #include "libc/calls/calls.h"
 #include "libc/dce.h"
 #include "libc/errno.h"
-#include "libc/mem/gc.internal.h"
+#include "libc/mem/gc.h"
 #include "libc/mem/mem.h"
 #include "libc/nt/efi.h"
 #include "libc/sock/epoll.h"

third_party/python/Modules/tlsmodule.c

@@ -20,7 +20,7 @@
 #include "libc/calls/calls.h"
 #include "libc/errno.h"
 #include "libc/macros.internal.h"
-#include "libc/mem/gc.internal.h"
+#include "libc/mem/gc.h"
 #include "libc/str/str.h"
 #include "net/https/https.h"
 #include "third_party/mbedtls/ctr_drbg.h"

third_party/python/Objects/listobject.c

@@ -6,7 +6,7 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/assert.h"
 #include "libc/mem/mem.h"
-#include "libc/mem/gc.internal.h"
+#include "libc/mem/gc.h"
 #include "third_party/python/Include/abstract.h"
 #include "third_party/python/Include/accu.h"
 #include "third_party/python/Include/boolobject.h"

third_party/python/Python/import.c

@@ -886,7 +886,7 @@ PyImport_ExecCodeModuleWithPathnames(const char *name, PyObject *co,
     else if (cpathobj != NULL) {
         // cpathobj != NULL means cpathname != NULL
         size_t cpathlen = strlen(cpathname);
-        char *pathname2 = _gc(strdup(cpathname));
+        char *pathname2 = gc(strdup(cpathname));
         if (_endswith(pathname2, ".pyc"))
         {
             pathname2[cpathlen-2] = '\0'; // so now ends with .py
@@ -2152,7 +2152,7 @@ static PyObject *_imp_path_isdir(PyObject *module, PyObject *arg) {
   Py_ssize_t n;
   const char *path;
   if (!PyArg_Parse(arg, "z#:_path_isdir", &path, &n)) return 0;
-  if (path == NULL) path = _gc(getcwd(NULL, 0));
+  if (path == NULL) path = gc(getcwd(NULL, 0));
   return _check_path_mode(path, S_IFDIR);
 }
 PyDoc_STRVAR(_imp_path_isdir_doc, "check if path is dir");
@@ -2172,7 +2172,7 @@ static PyObject *_imp_calc_mtime_and_size(PyObject *module, PyObject *arg) {
   Py_ssize_t n;
   const char *path;
   if (!PyArg_Parse(arg, "z#:_calc_mtime_and_size", &path, &n)) return 0;
-  if (path == NULL) path = _gc(getcwd(NULL, 0));
+  if (path == NULL) path = gc(getcwd(NULL, 0));
   if (stat(path, &stinfo))
     return PyTuple_Pack(2, PyLong_FromLong((long)-1), PyLong_FromLong((long)0));
   return PyTuple_Pack(2, PyLong_FromLong((long)stinfo.st_mtime),
@@ -2774,7 +2774,7 @@ static PyObject *CosmoImporter_find_spec(PyObject *cls, PyObject **args,
    */
 
   newpathsize = sizeof(basepath) + cnamelen + sizeof("/__init__.pyc") + 1;
-  newpath = _gc(malloc(newpathsize));
+  newpath = gc(malloc(newpathsize));
   bzero(newpath, newpathsize);
   /* performing a memccpy sequence equivalent to:
    * snprintf(newpath, newpathsize, "/zip/.python/%s.pyc", cname); */

third_party/python/Python/marshal.c

@@ -9,7 +9,7 @@
 #include "libc/calls/calls.h"
 #include "libc/calls/weirdtypes.h"
 #include "libc/mem/mem.h"
-#include "libc/mem/gc.internal.h"
+#include "libc/mem/gc.h"
 #include "third_party/python/Include/abstract.h"
 #include "third_party/python/Include/boolobject.h"
 #include "third_party/python/Include/code.h"

third_party/python/Python/sysmodule.c

@@ -6,7 +6,7 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/calls/calls.h"
 #include "libc/dce.h"
-#include "libc/mem/gc.internal.h"
+#include "libc/mem/gc.h"
 #include "libc/mem/mem.h"
 #include "libc/nt/dll.h"
 #include "libc/nt/version.h"

third_party/python/pycomp.c

@@ -118,15 +118,15 @@ main(int argc, char *argv[])
     GetOpts(argc, argv);
     marshalled = 0;
     if (stat(inpath, &st) == -1) perror(inpath), exit(1);
-    CHECK_NOTNULL((p = _gc(xslurp(inpath, &n))));
+    CHECK_NOTNULL((p = gc(xslurp(inpath, &n))));
     Py_NoUserSiteDirectory++;
     Py_NoSiteFlag++;
     Py_IgnoreEnvironmentFlag++;
     Py_FrozenFlag++;
     /* Py_VerboseFlag++; */
-    Py_SetProgramName(_gc(utf8to32(argv[0], -1, 0)));
+    Py_SetProgramName(gc(utf8to32(argv[0], -1, 0)));
     _Py_InitializeEx_Private(1, 0);
-    name = _gc(xjoinpaths("/zip/.python", StripComponents(inpath, 3)));
+    name = gc(xjoinpaths("/zip/.python", StripComponents(inpath, 3)));
     code = Py_CompileStringExFlags(p, name, Py_file_input, NULL, optimize);
     if (!code) goto error;
     marshalled = PyMarshal_WriteObjectToString(code, Py_MARSHAL_VERSION);

third_party/python/pyobj.c

@@ -25,7 +25,7 @@
 #include "libc/log/check.h"
 #include "libc/log/log.h"
 #include "libc/macros.internal.h"
-#include "libc/mem/gc.internal.h"
+#include "libc/mem/gc.h"
 #include "libc/mem/mem.h"
 #include "libc/runtime/runtime.h"
 #include "libc/runtime/stack.h"

third_party/python/runpythonmodule.c

@@ -17,7 +17,7 @@
 #include "libc/log/check.h"
 #include "libc/log/log.h"
 #include "libc/macros.internal.h"
-#include "libc/mem/gc.internal.h"
+#include "libc/mem/gc.h"
 #include "libc/mem/mem.h"
 #include "libc/runtime/runtime.h"
 #include "libc/runtime/symbols.internal.h"

third_party/quickjs/call.c

@@ -23,7 +23,7 @@
  * THE SOFTWARE.
  */
 #include "libc/assert.h"
-#include "libc/mem/gc.internal.h"
+#include "libc/mem/gc.h"
 #include "libc/mem/mem.h"
 #include "libc/runtime/runtime.h"
 #include "third_party/quickjs/internal.h"

third_party/quickjs/qjsc.c

@@ -477,7 +477,7 @@ int main(int argc, char **argv)
 {
     int c, i, verbose;
     const char *out_filename, *cname;
-    char *cfilename = _gc(malloc(1024));
+    char *cfilename = gc(malloc(1024));
     FILE *fo;
     JSRuntime *rt;
     JSContext *ctx;

third_party/sed/compile.c

@@ -46,7 +46,7 @@
 #include "libc/calls/weirdtypes.h"
 #include "libc/sysv/consts/s.h"
 #include "libc/sysv/consts/utime.h"
-#include "libc/mem/gc.internal.h"
+#include "libc/mem/gc.h"
 #include "libc/time/time.h"
 
 #include "libc/str/str.h"

third_party/sed/process.c

@@ -36,7 +36,7 @@
 #include "libc/errno.h"
 #include "libc/fmt/conv.h"
 #include "libc/log/bsd.h"
-#include "libc/mem/gc.internal.h"
+#include "libc/mem/gc.h"
 #include "libc/mem/mem.h"
 #include "libc/runtime/runtime.h"
 #include "libc/stdio/stdio.h"

third_party/smallz4/smallz4cat.c

@@ -28,7 +28,7 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/calls/calls.h"
 #include "libc/mem/mem.h"
-#include "libc/mem/gc.internal.h"
+#include "libc/mem/gc.h"
 #include "libc/runtime/runtime.h"
 #include "libc/stdio/stdio.h"
 #include "libc/str/str.h"

third_party/tidy/config.c

@@ -15,7 +15,7 @@
 #include "libc/assert.h"
 #include "libc/assert.h"
 #include "libc/calls/calls.h"
-#include "libc/mem/gc.internal.h"
+#include "libc/mem/gc.h"
 #include "libc/mem/mem.h"
 #include "libc/runtime/runtime.h"
 #include "third_party/tidy/tags.h"

third_party/unzip/unzip.c

@@ -70,7 +70,7 @@
 #include "third_party/unzip/crypt.h"
 #include "libc/log/log.h"
 #include "libc/mem/mem.h"
-#include "libc/mem/gc.internal.h"
+#include "libc/mem/gc.h"
 #include "third_party/unzip/unzvers.h"
 #include "third_party/unzip/globals.h"