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https://github.com/jart/cosmopolitan.git
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9cb54218ab
PYOBJ.COM was failing when statically analyzing _pyio.py in MODE=dbg because co_consts contained a big number, which dirtied the interpreter exception state. We now do comprehensive error checking w/ Python API. The -DSTACK_FRAME_UNLIMITED CPPFLAG has been removed from DES since its self test function has been fixed to use heap memory rather than making aggressive use of the stack. This change also fixes a regression with function tracing (the --ftrace flag a.k.a. ftrace_install() a.k.a. cosmo.ftrace) in ASAN build modes. Lastly, the _tracemalloc module should now always be available for use in MODE=dbg.
113 lines
4.4 KiB
C
113 lines
4.4 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/bits/bits.h"
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#include "libc/bits/safemacros.internal.h"
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#include "libc/log/libfatal.internal.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/runtime/runtime.h"
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#include "libc/runtime/symbols.internal.h"
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#include "libc/stdio/stdio.h"
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#include "libc/sysv/consts/o.h"
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#pragma weak stderr
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#define MAX_NESTING 512
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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 g_skew;
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static int g_lastsymbol;
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static uint64_t laststamp;
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static struct SymbolTable *g_symbols;
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static privileged noinstrument noasan int GetNestingLevelImpl(
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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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static privileged noinstrument noasan int GetNestingLevel(
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struct StackFrame *frame) {
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int nesting;
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nesting = GetNestingLevelImpl(frame);
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if (nesting < g_skew) g_skew = nesting;
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nesting -= g_skew;
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return MIN(MAX_NESTING, 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 noinstrument noasan void ftracer(void) {
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int symbol;
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uint64_t stamp;
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static bool noreentry;
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struct StackFrame *frame;
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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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if ((symbol = GetSymbol(g_symbols, frame->addr)) != -1 &&
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symbol != g_lastsymbol) {
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g_lastsymbol = symbol;
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__printf("+ %*s%s %d\r\n", GetNestingLevel(frame) * 2, "",
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GetSymbolName(g_symbols, symbol),
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(long)(unsignedsubtract(stamp, laststamp) / 3.3));
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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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const char *path;
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if ((path = FindDebugBinary())) {
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if ((g_symbols = OpenSymbolTable(path))) {
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laststamp = kStartTsc;
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g_lastsymbol = -1;
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g_skew = GetNestingLevelImpl(__builtin_frame_address(0));
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__hook(ftrace_hook, g_symbols);
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} else {
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__printf("error: --ftrace failed to open symbol table\r\n");
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}
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} else {
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__printf("error: --ftrace needs concomitant .com.dbg binary\r\n");
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}
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}
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