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| $ cat trace.h
#ifndef TRACE_H_
#define TRACE_H_
#include <stdio.h>
void DebugInfo(FILE *out, const void *ip);
void __attribute__((noinline)) PrintStackTrace(FILE *out, int skip);
void FuncC(void);
void FuncB(void);
void FuncA(void);
#endif
$ cat trace.cpp
#define UNW_LOCAL_ONLY
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#include <assert.h>
#include <libunwind.h>
#include <elfutils/libdwfl.h>
static void DebugInfo(FILE *out, const void *ip) {
char *debuginfo_path = NULL;
Dwfl_Callbacks callbacks;
callbacks.find_elf = dwfl_linux_proc_find_elf;
callbacks.find_debuginfo = dwfl_standard_find_debuginfo;
callbacks.debuginfo_path = &debuginfo_path;
Dwfl *dwfl = dwfl_begin(&callbacks);
assert(dwfl != NULL);
assert(dwfl_linux_proc_report(dwfl, getpid()) == 0);
assert(dwfl_report_end (dwfl, NULL, NULL) == 0);
Dwarf_Addr addr = (uintptr_t)ip;
Dwfl_Module *module = dwfl_addrmodule(dwfl, addr);
const char *function_name = dwfl_module_addrname(module, addr);
// 调用c++file命令还原函数名称
char cmd[1024];
snprintf(cmd, sizeof(cmd), "c++filt %s", function_name);
FILE *fp = popen(cmd, "r");
char result[1024];
fgets(result, sizeof(result), fp);
result[strlen(result) - 1] = '\0';
fprintf(out, "%s(", result);
pclose(fp);
Dwfl_Line *line = dwfl_getsrc(dwfl, addr);
if (line != NULL) {
int nline;
Dwarf_Addr addr;
const char *filename = dwfl_lineinfo(line, &addr, &nline, NULL, NULL, NULL);
fprintf(out, "%s:%d", strrchr(filename, '/') + 1, nline);
} else {
fprintf(out, "%p", ip);
}
}
static void __attribute__((noinline)) PrintStackTrace(FILE *out, int skip) {
unw_context_t uc;
unw_getcontext(&uc);
unw_cursor_t cursor;
unw_init_local(&cursor, &uc);
while (unw_step(&cursor) > 0) {
unw_word_t ip;
unw_get_reg(&cursor, UNW_REG_IP, &ip);
unw_word_t offset;
char name[32];
assert(unw_get_proc_name(&cursor, name, sizeof(name), &offset) == 0);
if (skip <= 0) {
fprintf(out, "\tat ");
DebugInfo(out, (void*)(ip - 4));
fprintf(out, ")\n");
}
if (strcmp(name, "main") == 0) {
break;
}
skip--;
}
}
void FuncC(void) {
PrintStackTrace(stdout, 0);
}
void FuncB(void) {
FuncC();
}
void FuncA(void) {
FuncB();
}
$ cat main.cpp
#include "trace.h"
int main() {
FuncA();
return 0;
}
$ cat makefile
CC = g++
CXXFLAGS = -ggdb3 -Wall
INCLUDE = -I./
LIB = -L./ -ltrace
TARGET = test_trace
all : $(TARGET)
$(TARGET) : main.o libtrace.so
$(CC) $(INCLUDE) main.o -o $(TARGET) $(LIB)
main.o : main.cpp
$(CC) $(CXXFLAGS) main.cpp -c
libtrace.so: trace.cpp trace.h
$(CC) -fPIC -shared $(INCLUDE) $(CXXFLAGS) trace.cpp -o libtrace.so -ldw -lunwind
clean :
rm -f *.o
rm -f libtrace.so
rm -f $(TARGET)
# 编译
$ make
g++ -ggdb3 -Wall main.cpp -c
g++ -fPIC -shared -I./ -ggdb3 -Wall trace.cpp -o libtrace.so -ldw -lunwind
g++ -I./ main.o -o test_trace -L./ -ltrace
# 运行
./test_trace
at FuncC()(trace.cpp:76)
at FuncB()(trace.cpp:80)
at FuncA()(trace.cpp:84)
at main(main.cpp:4)
|
