ラズベリーパイ最適化バックトレース（）

Question

ラストベリーPi最適化/特定のバックトレース（）実装はありますか？ 標準のbacktrace（）コードを使用していますが、my_backtrace関数のより詳細な出力を期待しています。このコードから

Answer 1

void my_backtrace(){ 
    void *stack[10]; 
    int n = backtrace(stack, 10); 
    std::cout << "Last frames==" << n << std::endl; 
    backtrace_symbols_fd(stack, n, STDOUT_FILENO); 
} 

//--There is list of options: 
//a) backtrace in combination with abi::__cxa_demangle 
//b) GDB 
//c) [libunwind][1], [http://www.nongnu.org/libunwind/docs.html] 
//d) libbfd-dev 
//e) [backward-cpp][1], [https://github.com/bombela/backward-cpp] 
//f) [libbacktrace][1], [https://github.com/ErwanLegrand/libbacktrace] 
//----------------------------------------------- 
#include <execinfo.h> 
#include <iostream> 
#include <sys/types.h> 
#include <unistd.h> 
#include <sstream> 
#include <sys/wait.h> 
//----------------------------------------------- 
//Based on GDB 
//----------------------------------------------- 
void print_trace_gdb() { 
    char pid_buf[30]; 
    sprintf(pid_buf, "%d", getpid()); 
    char name_buf[512]; 
    name_buf[readlink("/proc/self/exe", name_buf, 511)]=0; 

    int child_pid = fork(); 
    if (!child_pid) {   
     dup2(2,1); // redirect output to stderr 
     fprintf(stdout,"stack trace for %s pid=%s\n",name_buf, pid_buf); 
     execlp("gdb", "gdb", "--batch", "-n", "-ex", "thread", "-ex", "bt", name_buf, pid_buf, NULL); 
     //if gdb failed to start 
     abort(); 
    } else { 
     waitpid(child_pid,NULL,0); 
    } 
} 

//----------------------------------------------- 
void rec_function(int ii) 
{ 
    if (ii == 0) {std::cout << "int value==" << ii << "\n";} 
    else {rec_function(--ii);} 
    print_trace_gdb(); 
} 

//----------------------------------------------- 
int main() 
{ 
    int jj=1; 
    std::cout << "\n---begin test-----\n"; 
    std::cout << "int value==" << jj << "\n"; 
    rec_function(jj); 
    std::cout << "---end test-----\n"; 
} 

出力

---begin test----- 
int value==1 
int value==0 
stack trace for /opt/cpp/linux_backtrace_gdb pid=4181 
0x00007f878b5ca4ca in waitpid() from /lib/x86_64-linux-gnu/libc.so.6 
[Current thread is 1 (process 4181)] 
#0 0x00007f878b5ca4ca in waitpid() from /lib/x86_64-linux-gnu/libc.so.6 
#1 0x0000000000400e69 in print_trace_gdb() at linux_backtrace_gdb.cpp:25 
#2 0x0000000000400ed2 in rec_function (ii=0) at linux_backtrace_gdb.cpp:34 
#3 0x0000000000400ecd in rec_function (ii=0) at linux_backtrace_gdb.cpp:33 
#4 0x0000000000400f29 in main() at linux_backtrace_gdb.cpp:43 
stack trace for /opt/cpp/linux_backtrace_gdb pid=4181 
0x00007f878b5ca4ca in waitpid() from /lib/x86_64-linux-gnu/libc.so.6 
[Current thread is 1 (process 4181)] 
#0 0x00007f878b5ca4ca in waitpid() from /lib/x86_64-linux-gnu/libc.so.6 
#1 0x0000000000400e69 in print_trace_gdb() at linux_backtrace_gdb.cpp:25 
#2 0x0000000000400ed2 in rec_function (ii=0) at linux_backtrace_gdb.cpp:34 
#3 0x0000000000400f29 in main() at linux_backtrace_gdb.cpp:43 
---end test-----