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cosmopolitan/libc/fmt/zleb64.c

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Productionize new APE loader and more The APE_NO_MODIFY_SELF loader payload has been moved out of the examples folder and improved so that it works on BSD systems, and permits general elf program headers. This brings its quality up enough that it should be acceptable to use by default for many programs, e.g. Python, Lua, SQLite and Python. It's the responsibility of the user to define an appropriate TMPDIR if /tmp is considered an adversarial environment. Mac OS shall be supported by APE_NO_MODIFY_SELF soon. Fixes and improvements have been made to program_executable_name as it's now the one true way to get the absolute path of the executing image. This change fixes a memory leak in linenoise history loading, introduced by performance optimizations in 51904e2687c04d7ae20410cd94c2148972d6bae6 This change fixes a longstanding regression with Mach system calls, that 23ae9dfceb6f657862f00e674a8e4dc357a9d24d back in February which impacted our sched_yield() implementation, which is why no one noticed until now. The Blinkenlights PC emulator has been improved. We now fix rendering on XNU and BSD by not making the assumption that the kernel terminal driver understands UTF8 since that seems to break its internal modeling of \r\n which is now being addressed by using \e[𝑦H instead. The paneling is now more compact in real mode so you won't need to make your font as tiny if you're only emulating an 8086 program. The CLMUL ISA is now emulated too This change also makes improvement to time. CLOCK_MONOTONIC now does the right thing on Windows NT. The nanosecond time module functions added in Python 3.7 have been backported. This change doubles the performance of Argon2 password stretching simply by not using its copy_block and xor_block helper functions, as they were trivial to inline thus resulting in us needing to iterate over each 1024 byte block four fewer times. This change makes code size improvements. _PyUnicode_ToNumeric() was 64k in size and now it's 10k. The CJK codec lookup tables now use lazy delta zigzag deflate (δzd) encoding which reduces their size from 600k to 200k plus the code bloat caused by macro abuse in _decimal.c is now addressed so our fully-loaded statically-linked hermetically-sealed Python virtual interpreter container is now 9.4 megs in the default build mode and 5.5m in MODE=tiny which leaves plenty of room for chibicc. The pydoc web server now accommodates the use case of people who work by SSH'ing into a different machine w/ python.com -m pydoc -p8080 -h0.0.0.0 Finally Python Capsulae delenda est and won't be supported in the future
2021-10-02 15:17:04 +00:00
/*-*- 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 2020 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. │
╚──────────────────────────────────────────────────────────────────────────────╝
▄ ▄▄▄
▄▄▓▓██▀░ ▄ ▄▓▌▀▀▀███▒
▄ ░██░ ░▀▀ ▓▓█▓█▌ ▄▄▄██▀░ ▄▄░
░▄▓██░ ░██▄ ▄▄▓▌ ▄▓███░ ░▄█▀▄▓▒
░░▓█▓▄ ░▀██▒ ░▀█▄ ░▓██▓▄▒▄▄▀▀ ▄█▓▀▐██░
▄███ ▀██▄ ▀▓█▓▄▄▓▀ ▀▀▀▀ ░▄▄█▀░▒▓██▓ ░░▄▄▄▄▄▄
▄▄▓▀▐██ ░ ▓██▓▒ ▀▀ ▀▀▀ ▄▄██░ ▄▓██▓▀░░▀█░
▀▒▓░ ▐██▓ ▓▓▒ ▀▀░ ▀▀▀█▒ ▓█▓▀░ ▄█▓▓░
▒▀ ▒██▒░▄█▓▀ VARIABLE LENGTH INTEGER ENCODING ▓█░ ▐▓▄ ░ ▓
░███▓▀ ▀▓▓██▀▀░
░▀░ */
#include "libc/fmt/leb128.h"
/**
* Encodes signed integer to array w/ zig-zag encoding.
*
* uleb64 INT64_MAX l: 10𝑐 3𝑛𝑠
* zleb64 INT64_MAX l: 13𝑐 4𝑛𝑠
* sleb64 INT64_MAX l: 16𝑐 5𝑛𝑠
* uleb128 INT64_MAX l: 18𝑐 6𝑛𝑠
* zleb128 INT64_MAX l: 18𝑐 6𝑛𝑠
* sleb128 INT64_MAX l: 24𝑐 8𝑛𝑠
*
* @param p is output array which should have 10 items
* @param x is number
* @return p + i
* @see unzleb64()
*/
Support Linux binfmt_misc and APE loading on Apple The "no modify self" variant of Actually Portable Executable is now supported on all platforms. If you use `$(APE_NO_MODIFY_SELF)` then ld.bfd will embed a 4096 byte ELF binary and a 4096 byte Macho file which are installed on the fly to ${TMPDIR:-/tmp}, which enables us launch the executable, without needing to copy the whole executable To prevent it from copying a tiny executable to your temp directory you need to install the `ape` command (renamed from ape-loader), to a system path. For example: # FreeBSD / NetBSD / OpenBSD make -j8 o//ape/ape cp o//ape/ape /usr/bin/ape # Mac OS # make -j8 o//ape/ape.macho curl https://justine.lol/ape.macho >/usr/bin/ape chmod +x /usr/bin/ape On Linux you can get even more performance with the new binfmt_misc support which makes launching non-modifying APE binaries as fast as launching ELF executables. Running the following command: # Linux ape/apeinstall.sh Will copy APE loader to /usr/bin/ape and register with binfmt_misc Lastly, this change also fixes a really interesting race condition with OpenBSD thread joining.
2022-05-21 14:52:58 +00:00
char *zleb64(char p[hasatleast 10], int64_t x) {
Productionize new APE loader and more The APE_NO_MODIFY_SELF loader payload has been moved out of the examples folder and improved so that it works on BSD systems, and permits general elf program headers. This brings its quality up enough that it should be acceptable to use by default for many programs, e.g. Python, Lua, SQLite and Python. It's the responsibility of the user to define an appropriate TMPDIR if /tmp is considered an adversarial environment. Mac OS shall be supported by APE_NO_MODIFY_SELF soon. Fixes and improvements have been made to program_executable_name as it's now the one true way to get the absolute path of the executing image. This change fixes a memory leak in linenoise history loading, introduced by performance optimizations in 51904e2687c04d7ae20410cd94c2148972d6bae6 This change fixes a longstanding regression with Mach system calls, that 23ae9dfceb6f657862f00e674a8e4dc357a9d24d back in February which impacted our sched_yield() implementation, which is why no one noticed until now. The Blinkenlights PC emulator has been improved. We now fix rendering on XNU and BSD by not making the assumption that the kernel terminal driver understands UTF8 since that seems to break its internal modeling of \r\n which is now being addressed by using \e[𝑦H instead. The paneling is now more compact in real mode so you won't need to make your font as tiny if you're only emulating an 8086 program. The CLMUL ISA is now emulated too This change also makes improvement to time. CLOCK_MONOTONIC now does the right thing on Windows NT. The nanosecond time module functions added in Python 3.7 have been backported. This change doubles the performance of Argon2 password stretching simply by not using its copy_block and xor_block helper functions, as they were trivial to inline thus resulting in us needing to iterate over each 1024 byte block four fewer times. This change makes code size improvements. _PyUnicode_ToNumeric() was 64k in size and now it's 10k. The CJK codec lookup tables now use lazy delta zigzag deflate (δzd) encoding which reduces their size from 600k to 200k plus the code bloat caused by macro abuse in _decimal.c is now addressed so our fully-loaded statically-linked hermetically-sealed Python virtual interpreter container is now 9.4 megs in the default build mode and 5.5m in MODE=tiny which leaves plenty of room for chibicc. The pydoc web server now accommodates the use case of people who work by SSH'ing into a different machine w/ python.com -m pydoc -p8080 -h0.0.0.0 Finally Python Capsulae delenda est and won't be supported in the future
2021-10-02 15:17:04 +00:00
int c;
uint64_t u;
u = x;
u <<= 1;
u ^= x >> 63;
for (;;) {
c = u & 127;
if (!(u >>= 7)) {
*p++ = c;
return p;
} else {
*p++ = c | 128;
}
}
}
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