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https://github.com/jart/cosmopolitan.git
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e11fa30791
This way complex runtime features (e.g. ftrace, symbol tables) can always yoink zipos support. This is important now that apelink.com automates embedding symbol tables for multiple cpus.
44 lines
2.6 KiB
C
44 lines
2.6 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/runtime/internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "libc/thread/tls.h"
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__static_yoink("zipos");
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/**
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* Enables plaintext function tracing if `--ftrace` flag is passed.
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*
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* The `--ftrace` CLI arg is removed before main() is called. This code
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* is intended for diagnostic purposes and assumes binaries are
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* trustworthy and stack isn't corrupted. Logging plain text allows
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* program structure to easily be visualized and hotspots identified w/
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* `sed | sort | uniq -c | sort`. A compressed trace can be made by
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* appending `--ftrace 2>&1 | gzip -4 >trace.gz` to the CLI arguments.
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*
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* @see libc/runtime/_init.S for documentation
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*/
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textstartup int ftrace_init(void) {
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if (__intercept_flag(&__argc, __argv, "--ftrace")) {
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ftrace_install();
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ftrace_enabled(+1);
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}
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return __argc;
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}
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