openmp/libompd/gdb-plugin/ompd/ompd_callbacks.py

   1 import gdb
   2 import os
   3 import re
   4 import traceback
   5 import sys
   6
   7 """ This module evaluates function parameters of those OMPD callbacks that need GDB API calls.
   8 """
   9
  10 """ Have the debugger print a string.
  11 """
  12
  13
  14 def _print(*args):
  15     # args is a tuple with just one string element
  16     print_string = args[0]
  17     gdb.execute('printf "%s\n"' % args[0])
  18
  19
  20 """ Look up the address of a global symbol in the target.
  21 """
  22
  23
  24 def _sym_addr(*args):
  25     # args is a tuple consisting of thread_id and symbol_name
  26     thread_id = args[0]
  27     symbol_name = args[1]
  28     if thread_id >= 0:
  29         gdb.execute("thread %d\n" % thread_id, to_string=True)
  30     return int(gdb.parse_and_eval("&" + symbol_name))
  31
  32
  33 """ Read string from the target and copy it into the provided buffer.
  34 """
  35
  36
  37 def _read_string(*args):
  38     # args is a tuple with just the source address
  39     addr = args[0]
  40     try:
  41         buf = gdb.parse_and_eval("(unsigned char*)%li" % addr).string()
  42     except:
  43         traceback.print_exc()
  44     return buf
  45
  46
  47 """ Read memory from the target and copy it into the provided buffer.
  48 """
  49
  50
  51 def _read(*args):
  52     # args is a tuple consisting of address and number of bytes to be read
  53     addr = args[0]
  54     nbytes = args[1]
  55     #   print("_read(%i,%i)"%(addr, nbytes))
  56     ret_buf = bytearray()
  57     #   try:
  58     buf = gdb.parse_and_eval("(unsigned char*)%li" % addr)
  59     for i in range(nbytes):
  60         ret_buf.append(int(buf[i]))
  61     #   except:
  62     #           traceback.print_exc()
  63     return ret_buf
  64
  65
  66 """ Get thread-specific context.
  67 Return -1 if no match is found.
  68 """
  69
  70
  71 def _thread_context(*args):
  72     # args is a tuple consisting of thread_id and the thread kind
  73     thread_id = args[1]
  74     pthread = False
  75     lwp = False
  76     if args[0] == 0:
  77         pthread = True
  78     else:
  79         lwp = True
  80     info = gdb.execute("info threads", to_string=True).splitlines()
  81
  82     for line in info:
  83         if pthread:
  84             m = re.search(r"(0x[a-fA-F0-9]+)", line)
  85         elif lwp:
  86             m = re.search(r"\([^)]*?(\d+)[^)]*?\)", line)
  87         if m == None:
  88             continue
  89         pid = int(m.group(1), 0)
  90         if pid == thread_id:
  91             return int(line[2:6], 0)
  92     return -1
  93
  94
  95 """ Test info threads / list threads / how to split output to get thread id
  96 and its size.
  97 """
  98
  99
 100 def _test_threads(*args):
 101     info = gdb.execute("info threads", to_string=True).splitlines()
 102     for line in info[1:]:
 103         content = line.split()
 104         thread_id = None
 105         # fetch pointer to id
 106         if content[0].startswith("*"):
 107             thread_id = content[3]
 108         else:
 109             thread_id = content[2]
 110         sizeof_tid = sys.getsizeof(thread_id)
 111         print(sizeof_tid)
 112     print(info)