cosmopolitan/third_party/python/Python/wordcode_helpers.inc

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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:4;tab-width:8;coding:utf-8 -*-
│vi: set net ft=c ts=4 sts=4 sw=4 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
Python 3
https://docs.python.org/3/license.html
╚─────────────────────────────────────────────────────────────────────────────*/
Undiamond Python headers This change gets the Python codebase into a state where it conforms to the conventions of this codebase. It's now possible to include headers from Python, without worrying about ordering. Python has traditionally solved that problem by "diamonding" everything in Python.h, but that's problematic since it means any change to any Python header invalidates all the build artifacts. Lastly it makes tooling not work. Since it is hard to explain to Emacs when I press C-c C-h to add an import line it shouldn't add the header that actually defines the symbol, and instead do follow the nonstandard Python convention. Progress has been made on letting Python load source code from the zip executable structure via the standard C library APIs. System calss now recognizes zip!FILENAME alternative URIs as equivalent to zip:FILENAME since Python uses colon as its delimiter. Some progress has been made on embedding the notice license terms into the Python object code. This is easier said than done since Python has an extremely complicated ownership story. - Some termios APIs have been added - Implement rewinddir() dirstream API - GetCpuCount() API added to Cosmopolitan Libc - More bugs in Cosmopolitan Libc have been fixed - zipobj.com now has flags for mangling the path - Fixed bug a priori with sendfile() on certain BSDs - Polyfill F_DUPFD and F_DUPFD_CLOEXEC across platforms - FIOCLEX / FIONCLEX now polyfilled for fast O_CLOEXEC changes - APE now supports a hybrid solution to no-self-modify for builds - Many BSD-only magnums added, e.g. O_SEARCH, O_SHLOCK, SF_NODISKIO
2021-08-12 07:42:14 +00:00
#include "third_party/python/Include/code.h"
/* clang-format off */
/* This file contains code shared by the compiler and the peephole
optimizer.
*/
#ifdef WORDS_BIGENDIAN
# define PACKOPARG(opcode, oparg) ((_Py_CODEUNIT)(((opcode) << 8) | (oparg)))
#else
# define PACKOPARG(opcode, oparg) ((_Py_CODEUNIT)(((oparg) << 8) | (opcode)))
#endif
/* Minimum number of code units necessary to encode instruction with
EXTENDED_ARGs */
static int
instrsize(unsigned int oparg)
{
return oparg <= 0xff ? 1 :
oparg <= 0xffff ? 2 :
oparg <= 0xffffff ? 3 :
4;
}
/* Spits out op/oparg pair using ilen bytes. codestr should be pointed at the
desired location of the first EXTENDED_ARG */
static void
write_op_arg(_Py_CODEUNIT *codestr, unsigned char opcode,
unsigned int oparg, int ilen)
{
switch (ilen) {
case 4:
*codestr++ = PACKOPARG(EXTENDED_ARG, (oparg >> 24) & 0xff);
/* fall through */
case 3:
*codestr++ = PACKOPARG(EXTENDED_ARG, (oparg >> 16) & 0xff);
/* fall through */
case 2:
*codestr++ = PACKOPARG(EXTENDED_ARG, (oparg >> 8) & 0xff);
/* fall through */
case 1:
*codestr++ = PACKOPARG(opcode, oparg & 0xff);
break;
default:
assert(0);
}
}