mirror of
https://github.com/jart/cosmopolitan.git
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226aaf3547
This commit makes numerous refinements to cosmopolitan memory handling.
The default stack size has been reduced from 2mb to 128kb. A new macro
is now provided so you can easily reconfigure the stack size to be any
value you want. Work around the breaking change by adding to your main:
STATIC_STACK_SIZE(0x00200000); // 2mb stack
If you're not sure how much stack you need, then you can use:
STATIC_YOINK("stack_usage_logging");
After which you can `sort -nr o/$MODE/stack.log`. Based on the unit test
suite, nothing in the Cosmopolitan repository (except for Python) needs
a stack size greater than 30kb. There are also new macros for detecting
the size and address of the stack at runtime, e.g. GetStackAddr(). We
also now support sigaltstack() so if you want to see nice looking crash
reports whenever a stack overflow happens, you can put this in main():
ShowCrashReports();
Under `make MODE=dbg` and `make MODE=asan` the unit testing framework
will now automatically print backtraces of memory allocations when
things like memory leaks happen. Bugs are now fixed in ASAN global
variable overrun detection. The memtrack and asan runtimes also handle
edge cases now. The new tools helped to identify a few memory leaks,
which are fixed by this change.
This change should fix an issue reported in #288 with ARG_MAX limits.
Fixing this doubled the performance of MKDEPS.COM and AR.COM yet again.
118 lines
4.6 KiB
C
118 lines
4.6 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 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/memtrack.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/stdio/stdio.h"
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#include "libc/sysv/consts/map.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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bool ftrace_enabled;
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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 noubsan 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 noubsan 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 noubsan void ftracer(void) {
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/* asan runtime depends on this function */
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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 (ftrace_enabled && 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 = __get_symbol(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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__get_symbol_name(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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ftrace_enabled = 1;
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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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