142 lines
5.4 KiB
C
142 lines
5.4 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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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/intrin/repmovsb.h"
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#include "libc/macros.h"
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#include "libc/nexgen32e/stackframe.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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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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forceinline 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 interruptfn void ftrace_hook(void) {
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size_t i, j, nesting;
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const char *symbol;
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struct StackFrame *frame;
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if (g_symbols) {
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frame = __builtin_frame_address(0);
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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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(nesting = GetNestingLevel(frame)) * 2 < ARRAYLEN(g_buf) - 4) {
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i = 2;
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j = 0;
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while (nesting--) {
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g_buf[i++] = ' ';
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g_buf[i++] = ' ';
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}
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while (i < ARRAYLEN(g_buf) - 2 && symbol[j]) {
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g_buf[i++] = symbol[j++];
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}
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g_buf[i++] = '\r';
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g_buf[i++] = '\n';
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__print(g_buf, i);
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}
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g_lastsymbol = symbol;
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}
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}
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/**
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* Enables plaintext function tracing if --ftrace flag passed.
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*
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* The --ftrace CLI arg is removed before main() is called. This
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* code is intended for diagnostic purposes and assumes binaries
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* are trustworthy and stack isn't corrupted. Logging plain text
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* allows program structure to easily be visualized and hotspots
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* identified w/ sed | sort | uniq -c | sort. A compressed trace
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* can be made by appending --ftrace 2>&1 | gzip -4 >trace.gz to
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* the CLI arguments. Have fun.
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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(int argc, char *argv[]) {
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int i;
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bool foundflag;
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foundflag = false;
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for (i = 1; i <= argc; ++i) {
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if (!foundflag) {
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if (argv[i]) {
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if (strcmp(argv[i], "--ftrace") == 0) {
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foundflag = true;
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} else if (strcmp(argv[i], "----ftrace") == 0) {
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strcpy(argv[i], "--ftrace");
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}
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}
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} else {
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argv[i - 1] = argv[i];
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}
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}
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if (foundflag) {
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--argc;
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g_buf[0] = '+';
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g_buf[1] = ' ';
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if ((g_symbols = OpenSymbolTable(FindDebugBinary()))) {
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__hook(ftrace_hook, g_symbols);
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}
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}
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return argc;
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}
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