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v8/tools/grokdump.py
vitalyr@chromium.org ca7200da20 grokdump: Update the list of instance types. 
Review URL: http://codereview.chromium.org/7058008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7990 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-05-23 11:41:28 +00:00

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#!/usr/bin/env python
#
# 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 ctypes
import mmap
import optparse
import os
import disasm
import sys
import types
import codecs
import re
USAGE="""usage: %prog [OPTION]...
Minidump analyzer.
Shows the processor state at the point of exception including the
stack of the active thread and the referenced objects in the V8
heap. Code objects are disassembled and the addresses linked from the
stack (pushed return addresses) are marked with "=>".
Examples:
$ %prog 12345678-1234-1234-1234-123456789abcd-full.dmp
"""
DEBUG=False
def DebugPrint(s):
if not DEBUG: return
print s
class Descriptor(object):
"""Descriptor of a structure in a memory."""
def __init__(self, fields):
self.fields = fields
self.is_flexible = False
for _, type_or_func in fields:
if isinstance(type_or_func, types.FunctionType):
self.is_flexible = True
break
if not self.is_flexible:
self.ctype = Descriptor._GetCtype(fields)
self.size = ctypes.sizeof(self.ctype)
def Read(self, memory, offset):
if self.is_flexible:
fields_copy = self.fields[:]
last = 0
for name, type_or_func in fields_copy:
if isinstance(type_or_func, types.FunctionType):
partial_ctype = Descriptor._GetCtype(fields_copy[:last])
partial_object = partial_ctype.from_buffer(memory, offset)
type = type_or_func(partial_object)
if type is not None:
fields_copy[last] = (name, type)
last += 1
else:
last += 1
complete_ctype = Descriptor._GetCtype(fields_copy[:last])
else:
complete_ctype = self.ctype
return complete_ctype.from_buffer(memory, offset)
@staticmethod
def _GetCtype(fields):
class Raw(ctypes.Structure):
_fields_ = fields
_pack_ = 1
def __str__(self):
return "{" + ", ".join("%s: %s" % (field, self.__getattribute__(field))
for field, _ in Raw._fields_) + "}"
return Raw
# Set of structures and constants that describe the layout of minidump
# files. Based on MSDN and Google Breakpad.
MINIDUMP_HEADER = Descriptor([
("signature", ctypes.c_uint32),
("version", ctypes.c_uint32),
("stream_count", ctypes.c_uint32),
("stream_directories_rva", ctypes.c_uint32),
("checksum", ctypes.c_uint32),
("time_date_stampt", ctypes.c_uint32),
("flags", ctypes.c_uint64)
])
MINIDUMP_LOCATION_DESCRIPTOR = Descriptor([
("data_size", ctypes.c_uint32),
("rva", ctypes.c_uint32)
])
MINIDUMP_DIRECTORY = Descriptor([
("stream_type", ctypes.c_uint32),
("location", MINIDUMP_LOCATION_DESCRIPTOR.ctype)
])
MD_EXCEPTION_MAXIMUM_PARAMETERS = 15
MINIDUMP_EXCEPTION = Descriptor([
("code", ctypes.c_uint32),
("flags", ctypes.c_uint32),
("record", ctypes.c_uint64),
("address", ctypes.c_uint64),
("parameter_count", ctypes.c_uint32),
("unused_alignment", ctypes.c_uint32),
("information", ctypes.c_uint64 * MD_EXCEPTION_MAXIMUM_PARAMETERS)
])
MINIDUMP_EXCEPTION_STREAM = Descriptor([
("thread_id", ctypes.c_uint32),
("unused_alignment", ctypes.c_uint32),
("exception", MINIDUMP_EXCEPTION.ctype),
("thread_context", MINIDUMP_LOCATION_DESCRIPTOR.ctype)
])
# Stream types.
MD_UNUSED_STREAM = 0
MD_RESERVED_STREAM_0 = 1
MD_RESERVED_STREAM_1 = 2
MD_THREAD_LIST_STREAM = 3
MD_MODULE_LIST_STREAM = 4
MD_MEMORY_LIST_STREAM = 5
MD_EXCEPTION_STREAM = 6
MD_SYSTEM_INFO_STREAM = 7
MD_THREAD_EX_LIST_STREAM = 8
MD_MEMORY_64_LIST_STREAM = 9
MD_COMMENT_STREAM_A = 10
MD_COMMENT_STREAM_W = 11
MD_HANDLE_DATA_STREAM = 12
MD_FUNCTION_TABLE_STREAM = 13
MD_UNLOADED_MODULE_LIST_STREAM = 14
MD_MISC_INFO_STREAM = 15
MD_MEMORY_INFO_LIST_STREAM = 16
MD_THREAD_INFO_LIST_STREAM = 17
MD_HANDLE_OPERATION_LIST_STREAM = 18
MD_FLOATINGSAVEAREA_X86_REGISTERAREA_SIZE = 80
MINIDUMP_FLOATING_SAVE_AREA_X86 = Descriptor([
("control_word", ctypes.c_uint32),
("status_word", ctypes.c_uint32),
("tag_word", ctypes.c_uint32),
("error_offset", ctypes.c_uint32),
("error_selector", ctypes.c_uint32),
("data_offset", ctypes.c_uint32),
("data_selector", ctypes.c_uint32),
("register_area", ctypes.c_uint8 * MD_FLOATINGSAVEAREA_X86_REGISTERAREA_SIZE),
("cr0_npx_state", ctypes.c_uint32)
])
MD_CONTEXT_X86_EXTENDED_REGISTERS_SIZE = 512
# Context flags.
MD_CONTEXT_X86 = 0x00010000
MD_CONTEXT_X86_CONTROL = (MD_CONTEXT_X86 | 0x00000001)
MD_CONTEXT_X86_INTEGER = (MD_CONTEXT_X86 | 0x00000002)
MD_CONTEXT_X86_SEGMENTS = (MD_CONTEXT_X86 | 0x00000004)
MD_CONTEXT_X86_FLOATING_POINT = (MD_CONTEXT_X86 | 0x00000008)
MD_CONTEXT_X86_DEBUG_REGISTERS = (MD_CONTEXT_X86 | 0x00000010)
MD_CONTEXT_X86_EXTENDED_REGISTERS = (MD_CONTEXT_X86 | 0x00000020)
def EnableOnFlag(type, flag):
return lambda o: [None, type][int((o.context_flags & flag) != 0)]
MINIDUMP_CONTEXT_X86 = Descriptor([
("context_flags", ctypes.c_uint32),
# MD_CONTEXT_X86_DEBUG_REGISTERS.
("dr0", EnableOnFlag(ctypes.c_uint32, MD_CONTEXT_X86_DEBUG_REGISTERS)),
("dr1", EnableOnFlag(ctypes.c_uint32, MD_CONTEXT_X86_DEBUG_REGISTERS)),
("dr2", EnableOnFlag(ctypes.c_uint32, MD_CONTEXT_X86_DEBUG_REGISTERS)),
("dr3", EnableOnFlag(ctypes.c_uint32, MD_CONTEXT_X86_DEBUG_REGISTERS)),
("dr6", EnableOnFlag(ctypes.c_uint32, MD_CONTEXT_X86_DEBUG_REGISTERS)),
("dr7", EnableOnFlag(ctypes.c_uint32, MD_CONTEXT_X86_DEBUG_REGISTERS)),
# MD_CONTEXT_X86_FLOATING_POINT.
("float_save", EnableOnFlag(MINIDUMP_FLOATING_SAVE_AREA_X86.ctype,
MD_CONTEXT_X86_FLOATING_POINT)),
# MD_CONTEXT_X86_SEGMENTS.
("gs", EnableOnFlag(ctypes.c_uint32, MD_CONTEXT_X86_SEGMENTS)),
("fs", EnableOnFlag(ctypes.c_uint32, MD_CONTEXT_X86_SEGMENTS)),
("es", EnableOnFlag(ctypes.c_uint32, MD_CONTEXT_X86_SEGMENTS)),
("ds", EnableOnFlag(ctypes.c_uint32, MD_CONTEXT_X86_SEGMENTS)),
# MD_CONTEXT_X86_INTEGER.
("edi", EnableOnFlag(ctypes.c_uint32, MD_CONTEXT_X86_INTEGER)),
("esi", EnableOnFlag(ctypes.c_uint32, MD_CONTEXT_X86_INTEGER)),
("ebx", EnableOnFlag(ctypes.c_uint32, MD_CONTEXT_X86_INTEGER)),
("edx", EnableOnFlag(ctypes.c_uint32, MD_CONTEXT_X86_INTEGER)),
("ecx", EnableOnFlag(ctypes.c_uint32, MD_CONTEXT_X86_INTEGER)),
("eax", EnableOnFlag(ctypes.c_uint32, MD_CONTEXT_X86_INTEGER)),
# MD_CONTEXT_X86_CONTROL.
("ebp", EnableOnFlag(ctypes.c_uint32, MD_CONTEXT_X86_CONTROL)),
("eip", EnableOnFlag(ctypes.c_uint32, MD_CONTEXT_X86_CONTROL)),
("cs", EnableOnFlag(ctypes.c_uint32, MD_CONTEXT_X86_CONTROL)),
("eflags", EnableOnFlag(ctypes.c_uint32, MD_CONTEXT_X86_CONTROL)),
("esp", EnableOnFlag(ctypes.c_uint32, MD_CONTEXT_X86_CONTROL)),
("ss", EnableOnFlag(ctypes.c_uint32, MD_CONTEXT_X86_CONTROL)),
# MD_CONTEXT_X86_EXTENDED_REGISTERS.
("extended_registers",
EnableOnFlag(ctypes.c_uint8 * MD_CONTEXT_X86_EXTENDED_REGISTERS_SIZE,
MD_CONTEXT_X86_EXTENDED_REGISTERS))
])
MINIDUMP_MEMORY_DESCRIPTOR = Descriptor([
("start", ctypes.c_uint64),
("memory", MINIDUMP_LOCATION_DESCRIPTOR.ctype)
])
MINIDUMP_MEMORY_DESCRIPTOR64 = Descriptor([
("start", ctypes.c_uint64),
("size", ctypes.c_uint64)
])
MINIDUMP_MEMORY_LIST = Descriptor([
("range_count", ctypes.c_uint32),
("ranges", lambda m: MINIDUMP_MEMORY_DESCRIPTOR.ctype * m.range_count)
])
MINIDUMP_MEMORY_LIST64 = Descriptor([
("range_count", ctypes.c_uint64),
("base_rva", ctypes.c_uint64),
("ranges", lambda m: MINIDUMP_MEMORY_DESCRIPTOR64.ctype * m.range_count)
])
MINIDUMP_THREAD = Descriptor([
("id", ctypes.c_uint32),
("suspend_count", ctypes.c_uint32),
("priority_class", ctypes.c_uint32),
("priority", ctypes.c_uint32),
("ted", ctypes.c_uint64),
("stack", MINIDUMP_MEMORY_DESCRIPTOR.ctype),
("context", MINIDUMP_LOCATION_DESCRIPTOR.ctype)
])
MINIDUMP_THREAD_LIST = Descriptor([
("thread_count", ctypes.c_uint32),
("threads", lambda t: MINIDUMP_THREAD.ctype * t.thread_count)
])
class MinidumpReader(object):
"""Minidump (.dmp) reader."""
_HEADER_MAGIC = 0x504d444d
def __init__(self, options, minidump_name):
self.minidump_name = minidump_name
self.minidump_file = open(minidump_name, "r")
self.minidump = mmap.mmap(self.minidump_file.fileno(), 0, mmap.MAP_PRIVATE)
self.header = MINIDUMP_HEADER.Read(self.minidump, 0)
if self.header.signature != MinidumpReader._HEADER_MAGIC:
print >>sys.stderr, "Warning: unsupported minidump header magic"
DebugPrint(self.header)
directories = []
offset = self.header.stream_directories_rva
for _ in xrange(self.header.stream_count):
directories.append(MINIDUMP_DIRECTORY.Read(self.minidump, offset))
offset += MINIDUMP_DIRECTORY.size
self.exception = None
self.exception_context = None
self.memory_list = None
self.thread_map = {}
for d in directories:
DebugPrint(d)
# TODO(vitalyr): extract system info including CPU features.
if d.stream_type == MD_EXCEPTION_STREAM:
self.exception = MINIDUMP_EXCEPTION_STREAM.Read(
self.minidump, d.location.rva)
DebugPrint(self.exception)
self.exception_context = MINIDUMP_CONTEXT_X86.Read(
self.minidump, self.exception.thread_context.rva)
DebugPrint(self.exception_context)
elif d.stream_type == MD_THREAD_LIST_STREAM:
thread_list = MINIDUMP_THREAD_LIST.Read(self.minidump, d.location.rva)
assert ctypes.sizeof(thread_list) == d.location.data_size
DebugPrint(thread_list)
for thread in thread_list.threads:
DebugPrint(thread)
self.thread_map[thread.id] = thread
elif d.stream_type == MD_MEMORY_LIST_STREAM:
print >>sys.stderr, "Warning: not a full minidump"
ml = MINIDUMP_MEMORY_LIST.Read(self.minidump, d.location.rva)
DebugPrint(ml)
for m in ml.ranges:
DebugPrint(m)
elif d.stream_type == MD_MEMORY_64_LIST_STREAM:
assert self.memory_list is None
self.memory_list = MINIDUMP_MEMORY_LIST64.Read(
self.minidump, d.location.rva)
assert ctypes.sizeof(self.memory_list) == d.location.data_size
DebugPrint(self.memory_list)
def IsValidAddress(self, address):
return self.FindLocation(address) is not None
def ReadU8(self, address):
location = self.FindLocation(address)
return ctypes.c_uint8.from_buffer(self.minidump, location).value
def ReadU32(self, address):
location = self.FindLocation(address)
return ctypes.c_uint32.from_buffer(self.minidump, location).value
def ReadBytes(self, address, size):
location = self.FindLocation(address)
return self.minidump[location:location + size]
def FindLocation(self, address):
# TODO(vitalyr): only works for full minidumps (...64 structure variants).
offset = 0
for r in self.memory_list.ranges:
if r.start <= address < r.start + r.size:
return self.memory_list.base_rva + offset + address - r.start
offset += r.size
return None
def GetDisasmLines(self, address, size):
location = self.FindLocation(address)
if location is None: return []
return disasm.GetDisasmLines(self.minidump_name,
location,
size,
"ia32",
False)
def Dispose(self):
self.minidump.close()
self.minidump_file.close()
# List of V8 instance types. Obtained by adding the code below to any .cc file.
#
# #define DUMP_TYPE(T) printf("%d: \"%s\",\n", T, #T);
# struct P {
# P() {
# printf("{\n");
# INSTANCE_TYPE_LIST(DUMP_TYPE)
# printf("}\n");
# }
# };
# static P p;
INSTANCE_TYPES = {
64: "SYMBOL_TYPE",
68: "ASCII_SYMBOL_TYPE",
65: "CONS_SYMBOL_TYPE",
69: "CONS_ASCII_SYMBOL_TYPE",
66: "EXTERNAL_SYMBOL_TYPE",
74: "EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE",
70: "EXTERNAL_ASCII_SYMBOL_TYPE",
0: "STRING_TYPE",
4: "ASCII_STRING_TYPE",
1: "CONS_STRING_TYPE",
5: "CONS_ASCII_STRING_TYPE",
2: "EXTERNAL_STRING_TYPE",
10: "EXTERNAL_STRING_WITH_ASCII_DATA_TYPE",
6: "EXTERNAL_ASCII_STRING_TYPE",
6: "PRIVATE_EXTERNAL_ASCII_STRING_TYPE",
128: "MAP_TYPE",
129: "CODE_TYPE",
130: "ODDBALL_TYPE",
131: "JS_GLOBAL_PROPERTY_CELL_TYPE",
132: "HEAP_NUMBER_TYPE",
134: "JS_PROXY_TYPE",
133: "FOREIGN_TYPE",
135: "BYTE_ARRAY_TYPE",
136: "EXTERNAL_BYTE_ARRAY_TYPE",
137: "EXTERNAL_UNSIGNED_BYTE_ARRAY_TYPE",
138: "EXTERNAL_SHORT_ARRAY_TYPE",
139: "EXTERNAL_UNSIGNED_SHORT_ARRAY_TYPE",
140: "EXTERNAL_INT_ARRAY_TYPE",
141: "EXTERNAL_UNSIGNED_INT_ARRAY_TYPE",
142: "EXTERNAL_FLOAT_ARRAY_TYPE",
144: "EXTERNAL_PIXEL_ARRAY_TYPE",
145: "FILLER_TYPE",
146: "ACCESSOR_INFO_TYPE",
147: "ACCESS_CHECK_INFO_TYPE",
148: "INTERCEPTOR_INFO_TYPE",
149: "CALL_HANDLER_INFO_TYPE",
150: "FUNCTION_TEMPLATE_INFO_TYPE",
151: "OBJECT_TEMPLATE_INFO_TYPE",
152: "SIGNATURE_INFO_TYPE",
153: "TYPE_SWITCH_INFO_TYPE",
154: "SCRIPT_TYPE",
155: "CODE_CACHE_TYPE",
158: "FIXED_ARRAY_TYPE",
159: "SHARED_FUNCTION_INFO_TYPE",
160: "JS_MESSAGE_OBJECT_TYPE",
161: "JS_VALUE_TYPE",
162: "JS_OBJECT_TYPE",
163: "JS_CONTEXT_EXTENSION_OBJECT_TYPE",
164: "JS_GLOBAL_OBJECT_TYPE",
165: "JS_BUILTINS_OBJECT_TYPE",
166: "JS_GLOBAL_PROXY_TYPE",
167: "JS_ARRAY_TYPE",
168: "JS_REGEXP_TYPE",
169: "JS_FUNCTION_TYPE",
156: "DEBUG_INFO_TYPE",
157: "BREAK_POINT_INFO_TYPE",
}
class Printer(object):
"""Printer with indentation support."""
def __init__(self):
self.indent = 0
def Indent(self):
self.indent += 2
def Dedent(self):
self.indent -= 2
def Print(self, string):
print "%s%s" % (self._IndentString(), string)
def PrintLines(self, lines):
indent = self._IndentString()
print "\n".join("%s%s" % (indent, line) for line in lines)
def _IndentString(self):
return self.indent * " "
ADDRESS_RE = re.compile(r"0x[0-9a-fA-F]+")
def FormatDisasmLine(start, heap, line):
line_address = start + line[0]
stack_slot = heap.stack_map.get(line_address)
marker = " "
if stack_slot:
marker = "=>"
code = AnnotateAddresses(heap, line[1])
return "%s%08x %08x: %s" % (marker, line_address, line[0], code)
def AnnotateAddresses(heap, line):
extra = []
for m in ADDRESS_RE.finditer(line):
maybe_address = int(m.group(0), 16)
object = heap.FindObject(maybe_address)
if not object: continue
extra.append(str(object))
if len(extra) == 0: return line
return "%s ;; %s" % (line, ", ".join(extra))
class HeapObject(object):
def __init__(self, heap, map, address):
self.heap = heap
self.map = map
self.address = address
def Is(self, cls):
return isinstance(self, cls)
def Print(self, p):
p.Print(str(self))
def __str__(self):
return "HeapObject(%08x, %s)" % (self.address,
INSTANCE_TYPES[self.map.instance_type])
def ObjectField(self, offset):
field_value = self.heap.reader.ReadU32(self.address + offset)
return self.heap.FindObjectOrSmi(field_value)
def SmiField(self, offset):
field_value = self.heap.reader.ReadU32(self.address + offset)
assert (field_value & 1) == 0
return field_value / 2
class Map(HeapObject):
INSTANCE_TYPE_OFFSET = 8
def __init__(self, heap, map, address):
HeapObject.__init__(self, heap, map, address)
self.instance_type = \
heap.reader.ReadU8(self.address + Map.INSTANCE_TYPE_OFFSET)
class String(HeapObject):
LENGTH_OFFSET = 4
def __init__(self, heap, map, address):
HeapObject.__init__(self, heap, map, address)
self.length = self.SmiField(String.LENGTH_OFFSET)
def GetChars(self):
return "?string?"
def Print(self, p):
p.Print(str(self))
def __str__(self):
return "\"%s\"" % self.GetChars()
class SeqString(String):
CHARS_OFFSET = 12
def __init__(self, heap, map, address):
String.__init__(self, heap, map, address)
self.chars = heap.reader.ReadBytes(self.address + SeqString.CHARS_OFFSET,
self.length)
def GetChars(self):
return self.chars
class ExternalString(String):
RESOURCE_OFFSET = 12
WEBKIT_RESOUCE_STRING_IMPL_OFFSET = 4
WEBKIT_STRING_IMPL_CHARS_OFFSET = 8
def __init__(self, heap, map, address):
String.__init__(self, heap, map, address)
reader = heap.reader
self.resource = \
reader.ReadU32(self.address + ExternalString.RESOURCE_OFFSET)
self.chars = "?external string?"
if not reader.IsValidAddress(self.resource): return
string_impl_address = self.resource + \
ExternalString.WEBKIT_RESOUCE_STRING_IMPL_OFFSET
if not reader.IsValidAddress(string_impl_address): return
string_impl = reader.ReadU32(string_impl_address)
chars_ptr_address = string_impl + \
ExternalString.WEBKIT_STRING_IMPL_CHARS_OFFSET
if not reader.IsValidAddress(chars_ptr_address): return
chars_ptr = reader.ReadU32(chars_ptr_address)
if not reader.IsValidAddress(chars_ptr): return
raw_chars = reader.ReadBytes(chars_ptr, 2 * self.length)
self.chars = codecs.getdecoder("utf16")(raw_chars)[0]
def GetChars(self):
return self.chars
class ConsString(String):
LEFT_OFFSET = 12
RIGHT_OFFSET = 16
def __init__(self, heap, map, address):
String.__init__(self, heap, map, address)
self.left = self.ObjectField(ConsString.LEFT_OFFSET)
self.right = self.ObjectField(ConsString.RIGHT_OFFSET)
def GetChars(self):
return self.left.GetChars() + self.right.GetChars()
class Oddball(HeapObject):
TO_STRING_OFFSET = 4
def __init__(self, heap, map, address):
HeapObject.__init__(self, heap, map, address)
self.to_string = self.ObjectField(Oddball.TO_STRING_OFFSET)
def Print(self, p):
p.Print(str(self))
def __str__(self):
return "<%s>" % self.to_string.GetChars()
class FixedArray(HeapObject):
LENGTH_OFFSET = 4
ELEMENTS_OFFSET = 8
def __init__(self, heap, map, address):
HeapObject.__init__(self, heap, map, address)
self.length = self.SmiField(FixedArray.LENGTH_OFFSET)
def Print(self, p):
p.Print("FixedArray(%08x) {" % self.address)
p.Indent()
p.Print("length: %d" % self.length)
for i in xrange(self.length):
offset = FixedArray.ELEMENTS_OFFSET + 4 * i
p.Print("[%08d] = %s" % (i, self.ObjectField(offset)))
p.Dedent()
p.Print("}")
def __str__(self):
return "FixedArray(%08x, length=%d)" % (self.address, self.length)
class JSFunction(HeapObject):
CODE_ENTRY_OFFSET = 12
SHARED_OFFSET = 20
def __init__(self, heap, map, address):
HeapObject.__init__(self, heap, map, address)
code_entry = \
heap.reader.ReadU32(self.address + JSFunction.CODE_ENTRY_OFFSET)
self.code = heap.FindObject(code_entry - Code.ENTRY_OFFSET + 1)
self.shared = self.ObjectField(JSFunction.SHARED_OFFSET)
def Print(self, p):
source = "\n".join(" %s" % line for line in self._GetSource().split("\n"))
p.Print("JSFunction(%08x) {" % self.address)
p.Indent()
p.Print("inferred name: %s" % self.shared.inferred_name)
if self.shared.script.Is(Script) and self.shared.script.name.Is(String):
p.Print("script name: %s" % self.shared.script.name)
p.Print("source:")
p.PrintLines(self._GetSource().split("\n"))
p.Print("code:")
self.code.Print(p)
if self.code != self.shared.code:
p.Print("unoptimized code:")
self.shared.code.Print(p)
p.Dedent()
p.Print("}")
def __str__(self):
inferred_name = ""
if self.shared.Is(SharedFunctionInfo):
inferred_name = self.shared.inferred_name
return "JSFunction(%08x, %s)" % (self.address, inferred_name)
def _GetSource(self):
source = "?source?"
start = self.shared.start_position
end = self.shared.end_position
if not self.shared.script.Is(Script): return source
script_source = self.shared.script.source
if not script_source.Is(String): return source
return script_source.GetChars()[start:end]
class SharedFunctionInfo(HeapObject):
CODE_OFFSET = 2 * 4
SCRIPT_OFFSET = 7 * 4
INFERRED_NAME_OFFSET = 9 * 4
START_POSITION_AND_TYPE_OFFSET = 17 * 4
END_POSITION_OFFSET = 18 * 4
def __init__(self, heap, map, address):
HeapObject.__init__(self, heap, map, address)
self.code = self.ObjectField(SharedFunctionInfo.CODE_OFFSET)
self.script = self.ObjectField(SharedFunctionInfo.SCRIPT_OFFSET)
self.inferred_name = \
self.ObjectField(SharedFunctionInfo.INFERRED_NAME_OFFSET)
start_position_and_type = \
self.SmiField(SharedFunctionInfo.START_POSITION_AND_TYPE_OFFSET)
self.start_position = start_position_and_type >> 2
self.end_position = self.SmiField(SharedFunctionInfo.END_POSITION_OFFSET)
class Script(HeapObject):
SOURCE_OFFSET = 4
NAME_OFFSET = 8
def __init__(self, heap, map, address):
HeapObject.__init__(self, heap, map, address)
self.source = self.ObjectField(Script.SOURCE_OFFSET)
self.name = self.ObjectField(Script.NAME_OFFSET)
class Code(HeapObject):
INSTRUCTION_SIZE_OFFSET = 4
ENTRY_OFFSET = 32
def __init__(self, heap, map, address):
HeapObject.__init__(self, heap, map, address)
self.entry = self.address + Code.ENTRY_OFFSET
self.instruction_size = \
heap.reader.ReadU32(self.address + Code.INSTRUCTION_SIZE_OFFSET)
def Print(self, p):
lines = self.heap.reader.GetDisasmLines(self.entry, self.instruction_size)
p.Print("Code(%08x) {" % self.address)
p.Indent()
p.Print("instruction_size: %d" % self.instruction_size)
p.PrintLines(self._FormatLine(line) for line in lines)
p.Dedent()
p.Print("}")
def _FormatLine(self, line):
return FormatDisasmLine(self.entry, self.heap, line)
class V8Heap(object):
CLASS_MAP = {
"SYMBOL_TYPE": SeqString,
"ASCII_SYMBOL_TYPE": SeqString,
"CONS_SYMBOL_TYPE": ConsString,
"CONS_ASCII_SYMBOL_TYPE": ConsString,
"EXTERNAL_SYMBOL_TYPE": ExternalString,
"EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE": ExternalString,
"EXTERNAL_ASCII_SYMBOL_TYPE": ExternalString,
"STRING_TYPE": SeqString,
"ASCII_STRING_TYPE": SeqString,
"CONS_STRING_TYPE": ConsString,
"CONS_ASCII_STRING_TYPE": ConsString,
"EXTERNAL_STRING_TYPE": ExternalString,
"EXTERNAL_STRING_WITH_ASCII_DATA_TYPE": ExternalString,
"EXTERNAL_ASCII_STRING_TYPE": ExternalString,
"MAP_TYPE": Map,
"ODDBALL_TYPE": Oddball,
"FIXED_ARRAY_TYPE": FixedArray,
"JS_FUNCTION_TYPE": JSFunction,
"SHARED_FUNCTION_INFO_TYPE": SharedFunctionInfo,
"SCRIPT_TYPE": Script,
"CODE_TYPE": Code
}
def __init__(self, reader, stack_map):
self.reader = reader
self.stack_map = stack_map
self.objects = {}
def FindObjectOrSmi(self, tagged_address):
if (tagged_address & 1) == 0: return tagged_address / 2
return self.FindObject(tagged_address)
def FindObject(self, tagged_address):
if tagged_address in self.objects:
return self.objects[tagged_address]
if (tagged_address & 1) != 1: return None
address = tagged_address - 1
if not self.reader.IsValidAddress(address): return None
map_tagged_address = self.reader.ReadU32(address)
if tagged_address == map_tagged_address:
# Meta map?
meta_map = Map(self, None, address)
instance_type_name = INSTANCE_TYPES.get(meta_map.instance_type)
if instance_type_name != "MAP_TYPE": return None
meta_map.map = meta_map
object = meta_map
else:
map = self.FindObject(map_tagged_address)
if map is None: return None
instance_type_name = INSTANCE_TYPES.get(map.instance_type)
if instance_type_name is None: return None
cls = V8Heap.CLASS_MAP.get(instance_type_name, HeapObject)
object = cls(self, map, address)
self.objects[tagged_address] = object
return object
EIP_PROXIMITY = 64
def AnalyzeMinidump(options, minidump_name):
reader = MinidumpReader(options, minidump_name)
DebugPrint("========================================")
if reader.exception is None:
print "Minidump has no exception info"
return
print "Exception info:"
exception_thread = reader.thread_map[reader.exception.thread_id]
print " thread id: %d" % exception_thread.id
print " code: %08X" % reader.exception.exception.code
print " context:"
print " eax: %08x" % reader.exception_context.eax
print " ebx: %08x" % reader.exception_context.ebx
print " ecx: %08x" % reader.exception_context.ecx
print " edx: %08x" % reader.exception_context.edx
print " edi: %08x" % reader.exception_context.edi
print " esi: %08x" % reader.exception_context.esi
print " ebp: %08x" % reader.exception_context.ebp
print " esp: %08x" % reader.exception_context.esp
print " eip: %08x" % reader.exception_context.eip
# TODO(vitalyr): decode eflags.
print " eflags: %s" % bin(reader.exception_context.eflags)[2:]
print
stack_bottom = exception_thread.stack.start + \
exception_thread.stack.memory.data_size
stack_map = {reader.exception_context.eip: -1}
for slot in xrange(reader.exception_context.esp, stack_bottom, 4):
maybe_address = reader.ReadU32(slot)
if not maybe_address in stack_map:
stack_map[maybe_address] = slot
heap = V8Heap(reader, stack_map)
print "Disassembly around exception.eip:"
start = reader.exception_context.eip - EIP_PROXIMITY
lines = reader.GetDisasmLines(start, 2 * EIP_PROXIMITY)
for line in lines:
print FormatDisasmLine(start, heap, line)
print
print "Annotated stack (from exception.esp to bottom):"
for slot in xrange(reader.exception_context.esp, stack_bottom, 4):
maybe_address = reader.ReadU32(slot)
heap_object = heap.FindObject(maybe_address)
print "%08x: %08x" % (slot, maybe_address)
if heap_object:
heap_object.Print(Printer())
print
reader.Dispose()
if __name__ == "__main__":
parser = optparse.OptionParser(USAGE)
options, args = parser.parse_args()
if len(args) != 1:
parser.print_help()
sys.exit(1)
AnalyzeMinidump(options, args[0])
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