diff options
Diffstat (limited to 'examples/customization/bin-utils')
| -rw-r--r-- | examples/customization/bin-utils/.lldbinit | 5 | ||||
| -rw-r--r-- | examples/customization/bin-utils/README | 36 | ||||
| -rw-r--r-- | examples/customization/bin-utils/binutils.py | 122 |
3 files changed, 163 insertions, 0 deletions
diff --git a/examples/customization/bin-utils/.lldbinit b/examples/customization/bin-utils/.lldbinit new file mode 100644 index 000000000000..5a2f6feb94df --- /dev/null +++ b/examples/customization/bin-utils/.lldbinit @@ -0,0 +1,5 @@ +# So that ~/binutils.py takes precedence. +script sys.path[:0] = [os.path.expanduser('~')] +script import binutils +command script add -f binutils.itob itob +command script add -f binutils.utob utob diff --git a/examples/customization/bin-utils/README b/examples/customization/bin-utils/README new file mode 100644 index 000000000000..1352d93b2787 --- /dev/null +++ b/examples/customization/bin-utils/README @@ -0,0 +1,36 @@ +Files in this directory: + +o .lldbinit: + +An example lldb init file that imports the binutils.py module and adds the +following commands: 'itob' and 'utob'. + +o binutils.py: + +Python module which provides implementation for the 'itob' and 'utob' commands. + +o README: + +The file you are reading now. + +================================================================================ +The following terminal output shows an interaction with lldb using the .lldbinit +and the binutils.py files which are located in my HOME directory. The lldb init +file imports the utils Python module and adds the 'itob' and 'utob' commands. + +$ /Volumes/data/lldb/svn/trunk/build/Debug/lldb +(lldb) help itob +Convert the integer to print its two's complement representation. + args[0] (mandatory) is the integer to be converted + args[1] (mandatory) is the bit width of the two's complement representation + args[2] (optional) if specified, turns on verbose printing +Syntax: itob +(lldb) itob -5 4 + [1, 0, 1, 1] +(lldb) itob -5 32 v + 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 + [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1] +(lldb) utob 0xABCD 32 v + 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 + [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1] +(lldb) diff --git a/examples/customization/bin-utils/binutils.py b/examples/customization/bin-utils/binutils.py new file mode 100644 index 000000000000..313a354ec3a5 --- /dev/null +++ b/examples/customization/bin-utils/binutils.py @@ -0,0 +1,122 @@ +"Collection of tools for displaying bit representation of numbers.""" + +import StringIO + +def binary(n, width=None): + """ + Return a list of (0|1)'s for the binary representation of n where n >= 0. + If you specify a width, it must be > 0, otherwise it is ignored. The list + could be padded with 0 bits if width is specified. + """ + l = [] + if width and width <= 0: + width = None + while n > 0: + l.append(1 if n&1 else 0) + n = n >> 1 + + if width: + for i in range(width - len(l)): + l.append(0) + + l.reverse() + return l + +def twos_complement(n, width): + """ + Return a list of (0|1)'s for the binary representation of a width-bit two's + complement numeral system of an integer n which may be negative. + """ + val = 2**(width-1) + if n >= 0: + if n > (val-1): + return None + # It is safe to represent n with width-bits. + return binary(n, width) + + if n < 0: + if abs(n) > val: + return None + # It is safe to represent n (a negative int) with width-bits. + return binary(val*2 - abs(n)) + +# print binary(0xABCD) +# [1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1] +# print binary(0x1F, 8) +# [0, 0, 0, 1, 1, 1, 1, 1] +# print twos_complement(-5, 4) +# [1, 0, 1, 1] +# print twos_complement(7, 4) +# [0, 1, 1, 1] +# print binary(7) +# [1, 1, 1] +# print twos_complement(-5, 64) +# [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1] + +def positions(width): + """Helper function returning a list describing the bit positions. + Bit positions greater than 99 are truncated to 2 digits, for example, + 100 -> 00 and 127 -> 27.""" + return ['{0:2}'.format(i)[-2:] for i in reversed(range(width))] + + +def utob(debugger, command_line, result, dict): + """Convert the unsigned integer to print its binary representation. + args[0] (mandatory) is the unsigned integer to be converted + args[1] (optional) is the bit width of the binary representation + args[2] (optional) if specified, turns on verbose printing""" + args = command_line.split() + try: + n = int(args[0], 0) + width = None + if len(args) > 1: + width = int(args[1], 0) + if width < 0: + width = 0 + except: + print utob.__doc__ + return + + if len(args) > 2: + verbose = True + else: + verbose = False + + bits = binary(n, width) + if not bits: + print "insufficient width value: %d" % width + return + if verbose and width > 0: + pos = positions(width) + print ' '+' '.join(pos) + print ' %s' % str(bits) + +def itob(debugger, command_line, result, dict): + """Convert the integer to print its two's complement representation. + args[0] (mandatory) is the integer to be converted + args[1] (mandatory) is the bit width of the two's complement representation + args[2] (optional) if specified, turns on verbose printing""" + args = command_line.split() + try: + n = int(args[0], 0) + width = int(args[1], 0) + if width < 0: + width = 0 + except: + print itob.__doc__ + return + + if len(args) > 2: + verbose = True + else: + verbose = False + + bits = twos_complement(n, width) + if not bits: + print "insufficient width value: %d" % width + return + if verbose and width > 0: + pos = positions(width) + print ' '+' '.join(pos) + print ' %s' % str(bits) + |