# Copyright 2011 the V8 project authors. All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided
# with the distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import re
import tempfile
import os
import subprocess
import time
kSmiTag = 0
kSmiTagSize = 1
kSmiTagMask = (1 << kSmiTagSize) - 1
kHeapObjectTag = 1
kHeapObjectTagSize = 2
kHeapObjectTagMask = (1 << kHeapObjectTagSize) - 1
kFailureTag = 3
kFailureTagSize = 2
kFailureTagMask = (1 << kFailureTagSize) - 1
kSmiShiftSize32 = 0
kSmiValueSize32 = 31
kSmiShiftBits32 = kSmiTagSize + kSmiShiftSize32
kSmiShiftSize64 = 31
kSmiValueSize64 = 32
kSmiShiftBits64 = kSmiTagSize + kSmiShiftSize64
kAllBits = 0xFFFFFFFF
kTopBit32 = 0x80000000
kTopBit64 = 0x8000000000000000
t_u32 = gdb.lookup_type('unsigned int')
t_u64 = gdb.lookup_type('unsigned long long')
def has_smi_tag(v):
return v & kSmiTagMask == kSmiTag
def has_failure_tag(v):
return v & kFailureTagMask == kFailureTag
def has_heap_object_tag(v):
return v & kHeapObjectTagMask == kHeapObjectTag
def raw_heap_object(v):
return v - kHeapObjectTag
def smi_to_int_32(v):
v = v & kAllBits
if (v & kTopBit32) == kTopBit32:
return ((v & kAllBits) >> kSmiShiftBits32) - 2147483648
else:
return (v & kAllBits) >> kSmiShiftBits32
def smi_to_int_64(v):
return (v >> kSmiShiftBits64)
def decode_v8_value(v, bitness):
base_str = 'v8[%x]' % v
if has_smi_tag(v):
if bitness == 32:
return base_str + (" SMI(%d)" % smi_to_int_32(v))
else:
return base_str + (" SMI(%d)" % smi_to_int_64(v))
elif has_failure_tag(v):
return base_str + " (failure)"
elif has_heap_object_tag(v):
return base_str + (" H(0x%x)" % raw_heap_object(v))
else:
return base_str
class V8ValuePrinter(object):
"Print a v8value."
def __init__(self, val):
self.val = val
def to_string(self):
if self.val.type.sizeof == 4:
v_u32 = self.val.cast(t_u32)
return decode_v8_value(int(v_u32), 32)
elif self.val.type.sizeof == 8:
v_u64 = self.val.cast(t_u64)
return decode_v8_value(int(v_u64), 64)
else:
return 'v8value?'
def display_hint(self):
return 'v8value'
def v8_pretty_printers(val):
lookup_tag = val.type.tag
if lookup_tag == None:
return None
elif lookup_tag == 'v8value':
return V8ValuePrinter(val)
return None
gdb.pretty_printers.append(v8_pretty_printers)
def v8_to_int(v):
if v.type.sizeof == 4:
return int(v.cast(t_u32))
elif v.type.sizeof == 8:
return int(v.cast(t_u64))
else:
return '?'
def v8_get_value(vstring):
v = gdb.parse_and_eval(vstring)
return v8_to_int(v)
class V8PrintObject (gdb.Command):
"""Prints a v8 object."""
def __init__ (self):
super (V8PrintObject, self).__init__ ("v8print", gdb.COMMAND_DATA)
def invoke (self, arg, from_tty):
v = v8_get_value(arg)
gdb.execute('call __gdb_print_v8_object(%d)' % v)
V8PrintObject()
class FindAnywhere (gdb.Command):
"""Search memory for the given pattern."""
MAPPING_RE = re.compile(r"^\s*\[\d+\]\s+0x([0-9A-Fa-f]+)->0x([0-9A-Fa-f]+)")
LIVE_MAPPING_RE = re.compile(r"^\s+0x([0-9A-Fa-f]+)\s+0x([0-9A-Fa-f]+)")
def __init__ (self):
super (FindAnywhere, self).__init__ ("find-anywhere", gdb.COMMAND_DATA)
def find (self, startAddr, endAddr, value):
try:
result = gdb.execute(
"find 0x%s, 0x%s, %s" % (startAddr, endAddr, value),
to_string = True)
if result.find("not found") == -1:
print(result)
except:
pass
def invoke (self, value, from_tty):
for l in gdb.execute("maint info sections", to_string = True).split('\n'):
m = FindAnywhere.MAPPING_RE.match(l)
if m is None:
continue
self.find(m.group(1), m.group(2), value)
for l in gdb.execute("info proc mappings", to_string = True).split('\n'):
m = FindAnywhere.LIVE_MAPPING_RE.match(l)
if m is None:
continue
self.find(m.group(1), m.group(2), value)
FindAnywhere()
class Redirect(gdb.Command):
"""Redirect the subcommand's stdout to a temporary file.
Usage: redirect subcommand...
Example:
redirect job 0x123456789
redirect x/1024xg 0x12345678
If provided, the generated temporary file is directly openend with the
GDB_EXTERNAL_EDITOR environment variable.
"""
def __init__(self):
super(Redirect, self).__init__("redirect", gdb.COMMAND_USER)
def invoke(self, subcommand, from_tty):
old_stdout = gdb.execute("p dup(1)", to_string=True).split("=")[-1].strip()
try:
time_suffix = time.strftime("%Y%m%d-%H%M%S")
fd, file = tempfile.mkstemp(suffix="-%s.gdbout" % time_suffix)
try:
# Temporaily redirect stdout to the created tmp file for the
# duration of the subcommand.
gdb.execute('p dup2(open("%s", 1), 1)' % file, to_string=True)
# Execute subcommand non interactively.
result = gdb.execute(subcommand, from_tty=False, to_string=True)
# Write returned string results to the temporary file as well.
with open(file, 'a') as f:
f.write(result)
# Open generated result.
if 'GDB_EXTERNAL_EDITOR' in os.environ:
open_cmd = os.environ['GDB_EXTERNAL_EDITOR']
print("Opening '%s' with %s" % (file, open_cmd))
subprocess.call([open_cmd, file])
else:
print("Open output:\n %s '%s'" % (os.environ['EDITOR'], file))
finally:
# Restore original stdout.
gdb.execute("p dup2(%s, 1)" % old_stdout, to_string=True)
# Close the temporary file.
os.close(fd)
finally:
# Close the originally duplicated stdout descriptor.
gdb.execute("p close(%s)" % old_stdout, to_string=True)
Redirect()