iOS stack trace not accurate

Question

I am developing a iOS application and experiencing a crash. I cannot debug it because I need a serial communication implement that takes the place of the Apple connector. I have managed to generate a stack trace at the instance of failure:

    0 - 0   Flashtool_iPad                      0x0003d8c1 SignalHandler + 152
   1 - 1   libsystem_c.dylib                   0x3c0fee93 _sigtramp + 42
   2 - 2   libsystem_c.dylib                   0x3c12283d __sfvwrite + 352
   3 - 3   Flashtool_iPad                      0x00041811 -[ProgrammingLogic execute_programming_procedure] + 716
   4 - 4   Flashtool_iPad                      0x0003e86f __52-[ProgramViewController programController:forEvent:]_block_invoke + 54
   5 - 5   libdispatch.dylib                   0x3c09811f <redacted> + 10
   6 - 6   libdispatch.dylib                   0x3c09becf <redacted> + 142
   7 - 7   libdispatch.dylib                   0x3c09bdc1 <redacted> + 40
   8 - 8   libdispatch.dylib                   0x3c09c91d <redacted> + 184
   9 - 9   libdispatch.dylib                   0x3c09cac1 <redacted> + 84
  10 - 10  libsystem_c.dylib                   0x3c0cca11 <redacted> + 360
  11 - 11  libsystem_c.dylib                   0x3c0cc8a4 start_wqthread + 8

but unfortunately, the forth line indicating where the actual failure happened ( 3 - 3 Flashtool_iPad 0x00041811 -[ProgrammingLogic execute_programming_procedure] + 716 ) points to a comment in the objective C code...this statement: 4 - 4 Flashtool_iPad 0x0003e86f __52-[ProgramViewController programController:forEvent:]_block_invoke + 54 actually appears on line 48 of the source - not 54 ! So where does the offset come from? Thanks in advance

Answer 1

偏移量不是行，而是机器代码中函数开头的字节。