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https://github.com/jart/cosmopolitan.git
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51904e2687
This change reinvents all the GNU Readline features I discovered that I couldn't live without, e.g. UTF-8, CTRL-R search and CTRL-Y yanking. It now feels just as good in terms of user interface from the subconscious workflow perspective. It's real nice to finally have an embeddable line reader that's actually good with a 30 kb footprint and a bsd-2 license. This change adds a directory to the examples folder, explaining how the new Python compiler may be used. Some of the bugs with Python binaries have been addressed but overall it's still a work in progress.
124 lines
4.9 KiB
C
124 lines
4.9 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 2020 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/alg/bisectcarleft.internal.h"
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#include "libc/bits/bits.h"
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#include "libc/bits/safemacros.internal.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/struct/sigset.h"
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#include "libc/dce.h"
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#include "libc/fmt/itoa.h"
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#include "libc/intrin/repmovsb.h"
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#include "libc/macros.internal.h"
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#include "libc/nexgen32e/rdtsc.h"
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#include "libc/nexgen32e/rdtscp.h"
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#include "libc/nexgen32e/stackframe.h"
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#include "libc/nexgen32e/x86feature.h"
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#include "libc/nt/files.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/thunk/msabi.h"
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#include "libc/runtime/internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/symbols.internal.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/fileno.h"
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#include "libc/sysv/consts/nr.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/sysv/consts/sig.h"
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/**
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* @fileoverview Plain-text function call logging.
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*
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* Able to log ~2 million function calls per second, which is mostly
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* bottlenecked by system call overhead. Log size is reasonable if piped
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* into gzip.
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*/
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void ftrace_hook(void);
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static int noreentry;
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static uint64_t laststamp;
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static char g_buf[512];
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static const char *g_lastsymbol;
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static struct SymbolTable *g_symbols;
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static noasan int GetNestingLevel(struct StackFrame *frame) {
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int nesting = -2;
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while (frame) {
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++nesting;
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frame = frame->next;
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}
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return max(0, nesting);
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}
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/**
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* Prints name of function being called.
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*
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* We insert CALL instructions that point to this function, in the
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* prologues of other functions. We assume those functions behave
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* according to the System Five NexGen32e ABI.
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*/
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privileged noasan void ftracer(void) {
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char *p;
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uint64_t stamp;
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const char *symbol;
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struct StackFrame *frame;
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size_t nesting, symbolsize;
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if (!cmpxchg(&noreentry, 0, 1)) return;
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if (g_symbols) {
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stamp = rdtsc();
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frame = __builtin_frame_address(0);
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frame = frame->next;
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symbol =
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&g_symbols->name_base[g_symbols
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->symbols[bisectcarleft(
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(const int32_t(*)[2])g_symbols->symbols,
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g_symbols->count,
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frame->addr - g_symbols->addr_base)]
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.name_rva];
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if (symbol != g_lastsymbol) {
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symbolsize = strlen(symbol);
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nesting = GetNestingLevel(frame);
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if (2 + nesting * 2 + symbolsize + 1 + 21 + 2 <= ARRAYLEN(g_buf)) {
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p = g_buf;
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*p++ = '+';
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*p++ = ' ';
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memset(p, ' ', nesting * 2);
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p += nesting * 2;
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p = mempcpy(p, symbol, symbolsize);
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*p++ = ' ';
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p += uint64toarray_radix10((stamp - laststamp) / 3.3, p);
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*p++ = '\r';
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*p++ = '\n';
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write(2, g_buf, p - g_buf);
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}
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g_lastsymbol = symbol;
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laststamp = X86_HAVE(RDTSCP) ? rdtscp(0) : rdtsc();
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}
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}
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noreentry = 0;
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}
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textstartup void ftrace_install(void) {
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if ((g_symbols = OpenSymbolTable(FindDebugBinary()))) {
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__hook(ftrace_hook, g_symbols);
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} else {
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write(2, "error: --ftrace needs the concomitant .com.dbg binary\n", 54);
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}
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}
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