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#include <pthread.h>#include <unistd.h>#include <dlfcn.h>#include <cassert>#include <cstdio>#include <cstring>#include <iostream>#include <sstream>#include <stdexcept>#include <sys/time.h>#include <sys/stat.h>#include <sys/resource.h>#include <fcntl.h>#include <ucontext.h>#include <execinfo.h>#include "SimpleProfiler.h"#include "ProfParse.h"#include <fstream>Go to the source code of this file.
Namespaces | |
| namespace | INSTR |
Defines | |
| #define | _POSIX_C_SOURCE 199309 |
| #define | DODEBUG if(0) std::cerr |
| #define | getBP(X) asm ( "movl %%ebp,%0" : "=m" (X) ) |
| #define | getSP(X) asm ( "movl %%esp,%0" : "=m" (X) ) |
| #define | MUST_BE_ZERO(fun) if((fun)!=0) { perror("function failed"); abort(); } |
Functions | |
| void | sigFunc (int sig, siginfo_t *info, void *context) |
| int | stacktrace (void *addresses[], int nmax) |
Variables | |
| data refman pasoursint CMSSW_4_1_8_patch9 src FWCore Services src SimpleProfiler cc data refman pasoursint CMSSW_4_1_8_patch9 src FWCore Services src SimpleProfiler cc typedef unsigned char | INSTR::byte |
| const int | REG_EBP = 6 |
| const int | REG_EIP = 14 |
| const int | REG_ESP = 7 |
| const byte | INSTR::RET = 0xc3 |
| #define _POSIX_C_SOURCE 199309 |
Definition at line 3 of file SimpleProfiler.cc.
| #define DODEBUG if(0) std::cerr |
Definition at line 75 of file SimpleProfiler.cc.
| #define getBP | ( | X | ) | asm ( "movl %%ebp,%0" : "=m" (X) ) |
Definition at line 69 of file SimpleProfiler.cc.
Referenced by stacktrace().
| #define getSP | ( | X | ) | asm ( "movl %%esp,%0" : "=m" (X) ) |
Definition at line 70 of file SimpleProfiler.cc.
Referenced by stacktrace().
| #define MUST_BE_ZERO | ( | fun | ) | if((fun)!=0) { perror("function failed"); abort(); } |
Definition at line 68 of file SimpleProfiler.cc.
| void sigFunc | ( | int | sig, |
| siginfo_t * | info, | ||
| void * | context | ||
| ) |
Definition at line 350 of file SimpleProfiler.cc.
References SimpleProfiler::commitFrame(), SimpleProfiler::instance(), stacktrace(), SimpleProfiler::tempStack(), and SimpleProfiler::tempStackSize().
{
SimpleProfiler* prof = SimpleProfiler::instance();
void** arr = prof->tempStack();
int nmax = prof->tempStackSize();
int stackdepth = stacktrace(arr, nmax);
assert(stackdepth <= nmax);
// We don't want the first three entries, because they always
// contain information about the how the signal handler was
// called, the signal handler, and the stacktrace function.
prof->commitFrame(arr+3, arr + stackdepth);
}
| int stacktrace | ( | void * | addresses[], |
| int | nmax | ||
| ) |
Definition at line 224 of file SimpleProfiler.cc.
References evf::utils::eip, evf::utils::esp, getBP, getSP, if(), info, REG_EBP, and REG_EIP.
Referenced by sigFunc().
{
++samples_total;
#if __linux && __i386
# if ! __x86_64__
# define PROBABLY_VSYSCALL_PAGE 0xffff0000
# else
# define PROBABLY_VSYSCALL_PAGE 0xffffffff00000000
# endif
struct frame
{
// Normal frame.
frame *ebp;
void *eip;
// Signal frame stuff, put in here by kernel.
int signo;
siginfo_t *info;
ucontext_t *ctx;
};
// register frame *ebp __asm__ ("ebp");
// register frame *esp __asm__ ("esp");
// use macros to avoid compiler warning.
#define getBP(X) asm ( "movl %%ebp,%0" : "=m" (X) )
#define getSP(X) asm ( "movl %%esp,%0" : "=m" (X) )
register frame* ebp = 0;
getBP(ebp);
register frame* esp = 0;
getSP(esp);
frame *fp = ebp;
int depth = 0;
// Add fake entry to be compatible with other methods
if (depth < nmax) addresses[depth++] = reinterpret_cast<void *>(reinterpret_cast<unsigned long>(&stacktrace));
// Top-most frame ends with null pointer; check the rest is reasonable
while (depth < nmax && fp >= esp)
{
// Add this stack frame. The return address is the
// instruction immediately after the "call". The call
// instruction itself is 4 or 6 bytes; we guess 4.
addresses[depth++] = (char *) fp->eip - 4;
// Recognise signal frames. We use two different methods
// depending on the linux kernel version.
//
// For the "old" kernels / systems we check the instructions
// at the caller's return address. We take it to be a signal
// frame if we find the signal return code sequence there
// and the thread register context structure pointer:
//
// mov $__NR_rt_sigreturn, %eax
// int 0x80
//
// For the "new" kernels / systems the operating system maps
// a "vsyscall" page at a high address, and it may contain
// either the above code, or use of the sysenter/sysexit
// instructions. We cannot poke at that page so we take the
// the high address as an indication this is a signal frame.
// (https://www.trilithium.com/johan/2005/08/linux-gate/)
// (https://manugarg.googlepages.com/systemcallinlinux2_6.html)
//
// If we don't recognise the signal frame correctly here, we
// lose one stack frame: signal delivery is not a call so
// when the signal handler is entered, ebp still points to
// what it was just before the signal.
unsigned char *insn = (unsigned char *) fp->eip;
if (insn
&& insn[0] == 0xb8 && insn[1] == __NR_rt_sigreturn
&& insn[5] == 0xcd && insn[6] == 0x80
&& fp->ctx)
{
void *retip = (void *) fp->ctx->uc_mcontext.gregs [REG_EIP];
if (depth < nmax) addresses[depth++] = retip;
fp = (frame *) fp->ctx->uc_mcontext.gregs [REG_EBP];
if (fp && (unsigned long) retip > PROBABLY_VSYSCALL_PAGE)
{
// __kernel_vsyscall stack on system call exit is
// [0] %ebp, [1] %edx, [2] %ecx, [3] return address.
if (depth < nmax) addresses[depth++] = ((void **) fp)[3];
fp = fp->ebp;
// It seems the frame _above_ __kernel_syscall (the
// syscall implementation in libc, such as __mmap())
// is essentially frame-pointer-less, so we should
// find also the call above, but I don't know how
// to determine how many arguments the system call
// pushed on stack to call __kernel_syscall short
// of interpreting the DWARF unwind information :-(
// So we may lose one level of call stack here.
++samples_missing_framepointer;
}
}
// Otherwise it's a normal frame, process through frame pointer.
else
fp = fp->ebp;
}
return depth;
#elif __linux
return backtrace (addresses, nmax);
#elif HAVE_UNWIND_BACKTRACE
if (nmax >= 1)
{
IgHookTraceArgs args = { addresses, 0, nmax };
_Unwind_Backtrace (&GCCBackTrace, &args);
if (args.count > 1 && args.array [args.count-1] == 0)
args.count--;
return args.count;
}
return 0;
#else
return 0;
#endif
}
| const int REG_EBP = 6 |
Definition at line 82 of file SimpleProfiler.cc.
Referenced by stacktrace().
| const int REG_EIP = 14 |
Definition at line 81 of file SimpleProfiler.cc.
Referenced by stacktrace().
| const int REG_ESP = 7 |
Definition at line 83 of file SimpleProfiler.cc.
1.7.3