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#**************************************************************************
#* *
#* OCaml *
#* *
#* Stephen Dolan, University of Cambridge *
#* *
#* Copyright 2016 Stephen Dolan. *
#* *
#* All rights reserved. This file is distributed under the terms of *
#* the GNU Lesser General Public License version 2.1, with the *
#* special exception on linking described in the file LICENSE. *
#* *
#**************************************************************************
import gdb
TAGS = {
246: 'Lazy_tag',
247: 'Closure_tag',
248: 'Object_tag',
249: 'Infix_tag',
250: 'Forward_tag',
251: 'Abstract_tag',
252: 'String_tag',
253: 'Double_tag',
254: 'Double_array_tag',
255: 'Custom_tag'
}
No_scan_tag = 251
debug_tags = {
0x00: 'Debug_free_minor',
0x01: 'Debug_free_major',
0x03: 'Debug_free_shrink',
0x04: 'Debug_free_truncat',
0x10: 'Debug_uninit_minor',
0x11: 'Debug_uninit_major',
0x15: 'Debug_uninit_align',
0x85: 'Debug_filler_align'
}
class DoublePrinter:
def __init__(self, tag, length, p):
assert tag in ['Double_tag', 'Double_array_tag']
self.tag = tag
self.length = length
self.p = p
def children(self):
pass
def to_string(self):
return '%s[%d]' % (self.tag, self.length)
class ConstPrinter:
def __init__(self, rep):
self.rep = rep
def to_string(self):
return self.rep
class BlockPrinter:
def __init__(self, val):
if val & 1 == 1:
self.tag = 1000
self.tagname = 'I'
self.val = val
else:
self.p = val.cast(val.type.pointer())
header = (self.p - 1).dereference()
self.length = int(header >> 10)
self.gc = int(header & (3 << 8))
self.tag = int(header & 255)
self.tagname = TAGS.get(self.tag, 'Block')
def children(self):
# if self.tag < No_scan_tag:
# fields = self.p.cast(gdb.lookup_type('value').pointer())
# for i in range(self.length):
# yield '[%d]' % i, (fields + i).dereference()
# elif self.tagname == 'Double_array_tag':
# words_per_double = \
# gdb.lookup_type('double').sizeof / gdb.lookup_type('value').sizeof
# fields = self.p.cast(gdb.lookup_type('double').pointer())
# for i in range(int(self.length / words_per_double)):
# yield '[%d]' % i, (fields + i).dereference()
#
return []
def to_string(self):
if self.tag == 1000:
# it's an immediate value
if gdb.lookup_type('value').sizeof == 8:
debug_mask = 0xff00ffffff00ffff
debug_val = 0xD700D7D7D700D6D7
else:
debug_mask = 0xff00ffff
debug_val = 0xD700D6D7
n = self.val
if (n & debug_mask) == debug_val:
tag = int((n >> 16) & 0xff)
return debug_tags.get(tag,
"Debug_tag(0x%x)" % int(tag))
else:
return "I(%d)" % int(n >> 1)
# otherwise, it's a block
if self.tagname == 'Double_tag':
d = self.p.cast(gdb.lookup_type('double').pointer()).dereference()
s = '%f, wosize=1' % d
elif self.tagname == 'String_tag':
char = gdb.lookup_type('unsigned char')
val_size = gdb.lookup_type('value').sizeof
lastbyte = ((self.p + self.length - 1).cast(char.pointer()) + val_size - 1).dereference()
length_bytes = self.length * val_size - (lastbyte + 1)
string = (self.p.cast(char.array(length_bytes).pointer()).dereference())
s = str(string).strip()
elif self.tagname == 'Infix_tag':
s = 'offset=%d' % (-self.length)
elif self.tagname == 'Custom_tag':
ops = self.p.dereference().cast(gdb.lookup_type('struct custom_operations').pointer())
s = '%s, wosize=%d' % (str(ops), self.length)
elif self.tagname == 'Block':
s = '%d, wosize=%d' % (self.tag,self.length)
else:
s = 'wosize=%d' % self.length
markbits = gdb.lookup_symbol("global")[0].value()
gc = {
int(markbits['MARKED']): 'MARKED',
int(markbits['UNMARKED']): 'UNMARKED',
int(markbits['GARBAGE']): 'GARBAGE',
(3 << 8): 'NOT_MARKABLE'
}
return '%s(%s, %s)' % (self.tagname, s, gc[self.gc])
def display_hint (self):
return 'array'
class Fields(gdb.Function):
def __init__ (self):
super (Fields, self).__init__ ("F")
def invoke (self, val):
assert str(val.type) == 'value'
p = val.cast(val.type.pointer())
header = (p - 1).dereference()
length = int(header >> 10)
return p.cast(val.type.array(length - 1).pointer()).dereference()
Fields()
def value_printer(val):
if str(val.type) != 'value':
return None
return BlockPrinter(val)
gdb.pretty_printers = [value_printer]
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