#!/usr/bin/env python # # Copyright 2012 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 cmd import ctypes import mmap import optparse import os import disasm import sys import types import codecs import re import struct USAGE="""usage: %prog [OPTIONS] [DUMP-FILE] 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 (e.g. 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 def FullDump(reader, heap): """Dump all available memory regions.""" def dump_region(reader, start, size, location): print while start & 3 != 0: start += 1 size -= 1 location += 1 is_executable = reader.IsProbableExecutableRegion(location, size) is_ascii = reader.IsProbableASCIIRegion(location, size) if is_executable is not False: lines = reader.GetDisasmLines(start, size) for line in lines: print FormatDisasmLine(start, heap, line) print if is_ascii is not False: # Output in the same format as the Unix hd command addr = start for slot in xrange(location, location + size, 16): hex_line = "" asc_line = "" for i in xrange(0, 16): if slot + i < location + size: byte = ctypes.c_uint8.from_buffer(reader.minidump, slot + i).value if byte >= 0x20 and byte < 0x7f: asc_line += chr(byte) else: asc_line += "." hex_line += " %02x" % (byte) else: hex_line += " " if i == 7: hex_line += " " print "%s %s |%s|" % (reader.FormatIntPtr(addr), hex_line, asc_line) addr += 16 if is_executable is not True and is_ascii is not True: print "%s - %s" % (reader.FormatIntPtr(start), reader.FormatIntPtr(start + size)) for slot in xrange(start, start + size, reader.PointerSize()): maybe_address = reader.ReadUIntPtr(slot) heap_object = heap.FindObject(maybe_address) print "%s: %s" % (reader.FormatIntPtr(slot), reader.FormatIntPtr(maybe_address)) if heap_object: heap_object.Print(Printer()) print reader.ForEachMemoryRegion(dump_region) # 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)) ]) MD_CONTEXT_AMD64 = 0x00100000 MD_CONTEXT_AMD64_CONTROL = (MD_CONTEXT_AMD64 | 0x00000001) MD_CONTEXT_AMD64_INTEGER = (MD_CONTEXT_AMD64 | 0x00000002) MD_CONTEXT_AMD64_SEGMENTS = (MD_CONTEXT_AMD64 | 0x00000004) MD_CONTEXT_AMD64_FLOATING_POINT = (MD_CONTEXT_AMD64 | 0x00000008) MD_CONTEXT_AMD64_DEBUG_REGISTERS = (MD_CONTEXT_AMD64 | 0x00000010) MINIDUMP_CONTEXT_AMD64 = Descriptor([ ("p1_home", ctypes.c_uint64), ("p2_home", ctypes.c_uint64), ("p3_home", ctypes.c_uint64), ("p4_home", ctypes.c_uint64), ("p5_home", ctypes.c_uint64), ("p6_home", ctypes.c_uint64), ("context_flags", ctypes.c_uint32), ("mx_csr", ctypes.c_uint32), # MD_CONTEXT_AMD64_CONTROL. ("cs", EnableOnFlag(ctypes.c_uint16, MD_CONTEXT_AMD64_CONTROL)), # MD_CONTEXT_AMD64_SEGMENTS ("ds", EnableOnFlag(ctypes.c_uint16, MD_CONTEXT_AMD64_SEGMENTS)), ("es", EnableOnFlag(ctypes.c_uint16, MD_CONTEXT_AMD64_SEGMENTS)), ("fs", EnableOnFlag(ctypes.c_uint16, MD_CONTEXT_AMD64_SEGMENTS)), ("gs", EnableOnFlag(ctypes.c_uint16, MD_CONTEXT_AMD64_SEGMENTS)), # MD_CONTEXT_AMD64_CONTROL. ("ss", EnableOnFlag(ctypes.c_uint16, MD_CONTEXT_AMD64_CONTROL)), ("eflags", EnableOnFlag(ctypes.c_uint32, MD_CONTEXT_AMD64_CONTROL)), # MD_CONTEXT_AMD64_DEBUG_REGISTERS. ("dr0", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_DEBUG_REGISTERS)), ("dr1", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_DEBUG_REGISTERS)), ("dr2", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_DEBUG_REGISTERS)), ("dr3", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_DEBUG_REGISTERS)), ("dr6", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_DEBUG_REGISTERS)), ("dr7", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_DEBUG_REGISTERS)), # MD_CONTEXT_AMD64_INTEGER. ("rax", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_INTEGER)), ("rcx", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_INTEGER)), ("rdx", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_INTEGER)), ("rbx", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_INTEGER)), # MD_CONTEXT_AMD64_CONTROL. ("rsp", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_CONTROL)), # MD_CONTEXT_AMD64_INTEGER. ("rbp", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_INTEGER)), ("rsi", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_INTEGER)), ("rdi", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_INTEGER)), ("r8", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_INTEGER)), ("r9", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_INTEGER)), ("r10", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_INTEGER)), ("r11", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_INTEGER)), ("r12", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_INTEGER)), ("r13", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_INTEGER)), ("r14", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_INTEGER)), ("r15", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_INTEGER)), # MD_CONTEXT_AMD64_CONTROL. ("rip", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_CONTROL)), # MD_CONTEXT_AMD64_FLOATING_POINT ("sse_registers", EnableOnFlag(ctypes.c_uint8 * (16 * 26), MD_CONTEXT_AMD64_FLOATING_POINT)), ("vector_registers", EnableOnFlag(ctypes.c_uint8 * (16 * 26), MD_CONTEXT_AMD64_FLOATING_POINT)), ("vector_control", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_FLOATING_POINT)), # MD_CONTEXT_AMD64_DEBUG_REGISTERS. ("debug_control", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_DEBUG_REGISTERS)), ("last_branch_to_rip", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_DEBUG_REGISTERS)), ("last_branch_from_rip", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_DEBUG_REGISTERS)), ("last_exception_to_rip", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_DEBUG_REGISTERS)), ("last_exception_from_rip", EnableOnFlag(ctypes.c_uint64, MD_CONTEXT_AMD64_DEBUG_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) ]) MINIDUMP_RAW_SYSTEM_INFO = Descriptor([ ("processor_architecture", ctypes.c_uint16) ]) MD_CPU_ARCHITECTURE_X86 = 0 MD_CPU_ARCHITECTURE_AMD64 = 9 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.arch = None self.exception = None self.exception_context = None self.memory_list = None self.memory_list64 = None self.thread_map = {} # Find MDRawSystemInfo stream and determine arch. for d in directories: if d.stream_type == MD_SYSTEM_INFO_STREAM: system_info = MINIDUMP_RAW_SYSTEM_INFO.Read( self.minidump, d.location.rva) self.arch = system_info.processor_architecture assert self.arch in [MD_CPU_ARCHITECTURE_AMD64, MD_CPU_ARCHITECTURE_X86] assert not self.arch is None for d in directories: DebugPrint(d) if d.stream_type == MD_EXCEPTION_STREAM: self.exception = MINIDUMP_EXCEPTION_STREAM.Read( self.minidump, d.location.rva) DebugPrint(self.exception) if self.arch == MD_CPU_ARCHITECTURE_X86: self.exception_context = MINIDUMP_CONTEXT_X86.Read( self.minidump, self.exception.thread_context.rva) elif self.arch == MD_CPU_ARCHITECTURE_AMD64: self.exception_context = MINIDUMP_CONTEXT_AMD64.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: This is not a full minidump!" assert self.memory_list is None self.memory_list = MINIDUMP_MEMORY_LIST.Read( self.minidump, d.location.rva) assert ctypes.sizeof(self.memory_list) == d.location.data_size DebugPrint(self.memory_list) elif d.stream_type == MD_MEMORY_64_LIST_STREAM: assert self.memory_list64 is None self.memory_list64 = MINIDUMP_MEMORY_LIST64.Read( self.minidump, d.location.rva) assert ctypes.sizeof(self.memory_list64) == d.location.data_size DebugPrint(self.memory_list64) 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 ReadU64(self, address): location = self.FindLocation(address) return ctypes.c_uint64.from_buffer(self.minidump, location).value def ReadUIntPtr(self, address): if self.arch == MD_CPU_ARCHITECTURE_AMD64: return self.ReadU64(address) elif self.arch == MD_CPU_ARCHITECTURE_X86: return self.ReadU32(address) def ReadBytes(self, address, size): location = self.FindLocation(address) return self.minidump[location:location + size] def _ReadWord(self, location): if self.arch == MD_CPU_ARCHITECTURE_AMD64: return ctypes.c_uint64.from_buffer(self.minidump, location).value elif self.arch == MD_CPU_ARCHITECTURE_X86: return ctypes.c_uint32.from_buffer(self.minidump, location).value def IsProbableASCIIRegion(self, location, length): ascii_bytes = 0 non_ascii_bytes = 0 for loc in xrange(location, location + length): byte = ctypes.c_uint8.from_buffer(self.minidump, loc).value if byte >= 0x7f: non_ascii_bytes += 1 if byte < 0x20 and byte != 0: non_ascii_bytes += 1 if byte < 0x7f and byte >= 0x20: ascii_bytes += 1 if byte == 0xa: # newline ascii_bytes += 1 if ascii_bytes * 10 <= length: return False if length > 0 and ascii_bytes > non_ascii_bytes * 7: return True if ascii_bytes > non_ascii_bytes * 3: return None # Maybe return False def IsProbableExecutableRegion(self, location, length): opcode_bytes = 0 sixty_four = self.arch == MD_CPU_ARCHITECTURE_AMD64 for loc in xrange(location, location + length): byte = ctypes.c_uint8.from_buffer(self.minidump, loc).value if (byte == 0x8b or # mov byte == 0x89 or # mov reg-reg (byte & 0xf0) == 0x50 or # push/pop (sixty_four and (byte & 0xf0) == 0x40) or # rex prefix byte == 0xc3 or # return byte == 0x74 or # jeq byte == 0x84 or # jeq far byte == 0x75 or # jne byte == 0x85 or # jne far byte == 0xe8 or # call byte == 0xe9 or # jmp far byte == 0xeb): # jmp near opcode_bytes += 1 opcode_percent = (opcode_bytes * 100) / length threshold = 20 if opcode_percent > threshold + 2: return True if opcode_percent > threshold - 2: return None # Maybe return False def FindRegion(self, addr): answer = [-1, -1] def is_in(reader, start, size, location): if addr >= start and addr < start + size: answer[0] = start answer[1] = size self.ForEachMemoryRegion(is_in) if answer[0] == -1: return None return answer def ForEachMemoryRegion(self, cb): if self.memory_list64 is not None: for r in self.memory_list64.ranges: location = self.memory_list64.base_rva + offset cb(self, r.start, r.size, location) offset += r.size if self.memory_list is not None: for r in self.memory_list.ranges: cb(self, r.start, r.memory.data_size, r.memory.rva) def FindWord(self, word, alignment=0): def search_inside_region(reader, start, size, location): location = (location + alignment) & ~alignment for loc in xrange(location, location + size - self.PointerSize()): if reader._ReadWord(loc) == word: slot = start + (loc - location) print "%s: %s" % (reader.FormatIntPtr(slot), reader.FormatIntPtr(word)) self.ForEachMemoryRegion(search_inside_region) def FindLocation(self, address): offset = 0 if self.memory_list64 is not None: for r in self.memory_list64.ranges: if r.start <= address < r.start + r.size: return self.memory_list64.base_rva + offset + address - r.start offset += r.size if self.memory_list is not None: for r in self.memory_list.ranges: if r.start <= address < r.start + r.memory.data_size: return r.memory.rva + address - r.start return None def GetDisasmLines(self, address, size): location = self.FindLocation(address) if location is None: return [] arch = None if self.arch == MD_CPU_ARCHITECTURE_X86: arch = "ia32" elif self.arch == MD_CPU_ARCHITECTURE_AMD64: arch = "x64" return disasm.GetDisasmLines(self.minidump_name, location, size, arch, False) def Dispose(self): self.minidump.close() self.minidump_file.close() def ExceptionIP(self): if self.arch == MD_CPU_ARCHITECTURE_AMD64: return self.exception_context.rip elif self.arch == MD_CPU_ARCHITECTURE_X86: return self.exception_context.eip def ExceptionSP(self): if self.arch == MD_CPU_ARCHITECTURE_AMD64: return self.exception_context.rsp elif self.arch == MD_CPU_ARCHITECTURE_X86: return self.exception_context.esp def FormatIntPtr(self, value): if self.arch == MD_CPU_ARCHITECTURE_AMD64: return "%016x" % value elif self.arch == MD_CPU_ARCHITECTURE_X86: return "%08x" % value def PointerSize(self): if self.arch == MD_CPU_ARCHITECTURE_AMD64: return 8 elif self.arch == MD_CPU_ARCHITECTURE_X86: return 4 def Register(self, name): return self.exception_context.__getattribute__(name) # 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("INSTANCE_TYPES = {\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", 82: "SHORT_EXTERNAL_SYMBOL_TYPE", 90: "SHORT_EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE", 86: "SHORT_EXTERNAL_ASCII_SYMBOL_TYPE", 0: "STRING_TYPE", 4: "ASCII_STRING_TYPE", 1: "CONS_STRING_TYPE", 5: "CONS_ASCII_STRING_TYPE", 3: "SLICED_STRING_TYPE", 2: "EXTERNAL_STRING_TYPE", 10: "EXTERNAL_STRING_WITH_ASCII_DATA_TYPE", 6: "EXTERNAL_ASCII_STRING_TYPE", 18: "SHORT_EXTERNAL_STRING_TYPE", 26: "SHORT_EXTERNAL_STRING_WITH_ASCII_DATA_TYPE", 22: "SHORT_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", 133: "FOREIGN_TYPE", 134: "BYTE_ARRAY_TYPE", 135: "FREE_SPACE_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", 146: "FILLER_TYPE", 147: "ACCESSOR_INFO_TYPE", 148: "ACCESSOR_PAIR_TYPE", 149: "ACCESS_CHECK_INFO_TYPE", 150: "INTERCEPTOR_INFO_TYPE", 151: "CALL_HANDLER_INFO_TYPE", 152: "FUNCTION_TEMPLATE_INFO_TYPE", 153: "OBJECT_TEMPLATE_INFO_TYPE", 154: "SIGNATURE_INFO_TYPE", 155: "TYPE_SWITCH_INFO_TYPE", 156: "SCRIPT_TYPE", 157: "CODE_CACHE_TYPE", 158: "POLYMORPHIC_CODE_CACHE_TYPE", 159: "TYPE_FEEDBACK_INFO_TYPE", 160: "ALIASED_ARGUMENTS_ENTRY_TYPE", 163: "FIXED_ARRAY_TYPE", 145: "FIXED_DOUBLE_ARRAY_TYPE", 164: "SHARED_FUNCTION_INFO_TYPE", 165: "JS_MESSAGE_OBJECT_TYPE", 168: "JS_VALUE_TYPE", 169: "JS_DATE_TYPE", 170: "JS_OBJECT_TYPE", 171: "JS_CONTEXT_EXTENSION_OBJECT_TYPE", 172: "JS_MODULE_TYPE", 173: "JS_GLOBAL_OBJECT_TYPE", 174: "JS_BUILTINS_OBJECT_TYPE", 175: "JS_GLOBAL_PROXY_TYPE", 176: "JS_ARRAY_TYPE", 167: "JS_PROXY_TYPE", 179: "JS_WEAK_MAP_TYPE", 180: "JS_REGEXP_TYPE", 181: "JS_FUNCTION_TYPE", 166: "JS_FUNCTION_PROXY_TYPE", 161: "DEBUG_INFO_TYPE", 162: "BREAK_POINT_INFO_TYPE", } # List of known V8 maps. Used to determine the instance type and name # for maps that are part of the root-set and hence on the first page of # the map-space. Obtained by adding the code below to an IA32 release # build with enabled snapshots to the end of the Isolate::Init method. # # #define ROOT_LIST_CASE(type, name, camel_name) \ # if (o == heap_.name()) n = #camel_name; # #define STRUCT_LIST_CASE(upper_name, camel_name, name) \ # if (o == heap_.name##_map()) n = #camel_name "Map"; # HeapObjectIterator it(heap_.map_space()); # printf("KNOWN_MAPS = {\n"); # for (Object* o = it.Next(); o != NULL; o = it.Next()) { # Map* m = Map::cast(o); # const char* n = ""; # intptr_t p = reinterpret_cast(m) & 0xfffff; # int t = m->instance_type(); # ROOT_LIST(ROOT_LIST_CASE) # STRUCT_LIST(STRUCT_LIST_CASE) # printf(" 0x%05x: (%d, \"%s\"),\n", p, t, n); # } # printf("}\n"); KNOWN_MAPS = { 0x08081: (134, "ByteArrayMap"), 0x080a1: (128, "MetaMap"), 0x080c1: (130, "OddballMap"), 0x080e1: (163, "FixedArrayMap"), 0x08101: (68, "AsciiSymbolMap"), 0x08121: (132, "HeapNumberMap"), 0x08141: (135, "FreeSpaceMap"), 0x08161: (146, "OnePointerFillerMap"), 0x08181: (146, "TwoPointerFillerMap"), 0x081a1: (131, "GlobalPropertyCellMap"), 0x081c1: (164, "SharedFunctionInfoMap"), 0x081e1: (4, "AsciiStringMap"), 0x08201: (163, "GlobalContextMap"), 0x08221: (129, "CodeMap"), 0x08241: (163, "ScopeInfoMap"), 0x08261: (163, "FixedCOWArrayMap"), 0x08281: (145, "FixedDoubleArrayMap"), 0x082a1: (163, "HashTableMap"), 0x082c1: (0, "StringMap"), 0x082e1: (64, "SymbolMap"), 0x08301: (1, "ConsStringMap"), 0x08321: (5, "ConsAsciiStringMap"), 0x08341: (3, "SlicedStringMap"), 0x08361: (7, "SlicedAsciiStringMap"), 0x08381: (65, "ConsSymbolMap"), 0x083a1: (69, "ConsAsciiSymbolMap"), 0x083c1: (66, "ExternalSymbolMap"), 0x083e1: (74, "ExternalSymbolWithAsciiDataMap"), 0x08401: (70, "ExternalAsciiSymbolMap"), 0x08421: (2, "ExternalStringMap"), 0x08441: (10, "ExternalStringWithAsciiDataMap"), 0x08461: (6, "ExternalAsciiStringMap"), 0x08481: (82, "ShortExternalSymbolMap"), 0x084a1: (90, "ShortExternalSymbolWithAsciiDataMap"), 0x084c1: (86, "ShortExternalAsciiSymbolMap"), 0x084e1: (18, "ShortExternalStringMap"), 0x08501: (26, "ShortExternalStringWithAsciiDataMap"), 0x08521: (22, "ShortExternalAsciiStringMap"), 0x08541: (0, "UndetectableStringMap"), 0x08561: (4, "UndetectableAsciiStringMap"), 0x08581: (144, "ExternalPixelArrayMap"), 0x085a1: (136, "ExternalByteArrayMap"), 0x085c1: (137, "ExternalUnsignedByteArrayMap"), 0x085e1: (138, "ExternalShortArrayMap"), 0x08601: (139, "ExternalUnsignedShortArrayMap"), 0x08621: (140, "ExternalIntArrayMap"), 0x08641: (141, "ExternalUnsignedIntArrayMap"), 0x08661: (142, "ExternalFloatArrayMap"), 0x08681: (143, "ExternalDoubleArrayMap"), 0x086a1: (163, "NonStrictArgumentsElementsMap"), 0x086c1: (163, "FunctionContextMap"), 0x086e1: (163, "CatchContextMap"), 0x08701: (163, "WithContextMap"), 0x08721: (163, "BlockContextMap"), 0x08741: (163, "ModuleContextMap"), 0x08761: (165, "JSMessageObjectMap"), 0x08781: (133, "ForeignMap"), 0x087a1: (170, "NeanderMap"), 0x087c1: (158, "PolymorphicCodeCacheMap"), 0x087e1: (156, "ScriptMap"), 0x08801: (147, "AccessorInfoMap"), 0x08821: (148, "AccessorPairMap"), 0x08841: (149, "AccessCheckInfoMap"), 0x08861: (150, "InterceptorInfoMap"), 0x08881: (151, "CallHandlerInfoMap"), 0x088a1: (152, "FunctionTemplateInfoMap"), 0x088c1: (153, "ObjectTemplateInfoMap"), 0x088e1: (154, "SignatureInfoMap"), 0x08901: (155, "TypeSwitchInfoMap"), 0x08921: (157, "CodeCacheMap"), 0x08941: (159, "TypeFeedbackInfoMap"), 0x08961: (160, "AliasedArgumentsEntryMap"), 0x08981: (161, "DebugInfoMap"), 0x089a1: (162, "BreakPointInfoMap"), } # List of known V8 objects. Used to determine name for objects that are # part of the root-set and hence on the first page of various old-space # paged. Obtained by adding the code below to an IA32 release build with # enabled snapshots to the end of the Isolate::Init method. # # #define ROOT_LIST_CASE(type, name, camel_name) \ # if (o == heap_.name()) n = #camel_name; # OldSpaces spit; # printf("KNOWN_OBJECTS = {\n"); # for (PagedSpace* s = spit.next(); s != NULL; s = spit.next()) { # HeapObjectIterator it(s); # const char* sname = AllocationSpaceName(s->identity()); # for (Object* o = it.Next(); o != NULL; o = it.Next()) { # const char* n = NULL; # intptr_t p = reinterpret_cast(o) & 0xfffff; # ROOT_LIST(ROOT_LIST_CASE) # if (n != NULL) { # printf(" (\"%s\", 0x%05x): \"%s\",\n", sname, p, n); # } # } # } # printf("}\n"); KNOWN_OBJECTS = { ("OLD_POINTER_SPACE", 0x08081): "NullValue", ("OLD_POINTER_SPACE", 0x08091): "UndefinedValue", ("OLD_POINTER_SPACE", 0x080a1): "InstanceofCacheMap", ("OLD_POINTER_SPACE", 0x080b1): "TrueValue", ("OLD_POINTER_SPACE", 0x080c1): "FalseValue", ("OLD_POINTER_SPACE", 0x080d1): "NoInterceptorResultSentinel", ("OLD_POINTER_SPACE", 0x080e1): "ArgumentsMarker", ("OLD_POINTER_SPACE", 0x080f1): "NumberStringCache", ("OLD_POINTER_SPACE", 0x088f9): "SingleCharacterStringCache", ("OLD_POINTER_SPACE", 0x08b01): "StringSplitCache", ("OLD_POINTER_SPACE", 0x08f09): "TerminationException", ("OLD_POINTER_SPACE", 0x08f19): "MessageListeners", ("OLD_POINTER_SPACE", 0x08f35): "CodeStubs", ("OLD_POINTER_SPACE", 0x09b61): "NonMonomorphicCache", ("OLD_POINTER_SPACE", 0x0a175): "PolymorphicCodeCache", ("OLD_POINTER_SPACE", 0x0a17d): "NativesSourceCache", ("OLD_POINTER_SPACE", 0x0a1bd): "EmptyScript", ("OLD_POINTER_SPACE", 0x0a1f9): "IntrinsicFunctionNames", ("OLD_POINTER_SPACE", 0x24a49): "SymbolTable", ("OLD_DATA_SPACE", 0x08081): "EmptyFixedArray", ("OLD_DATA_SPACE", 0x080a1): "NanValue", ("OLD_DATA_SPACE", 0x0811d): "EmptyByteArray", ("OLD_DATA_SPACE", 0x08125): "EmptyString", ("OLD_DATA_SPACE", 0x08131): "EmptyDescriptorArray", ("OLD_DATA_SPACE", 0x08259): "InfinityValue", ("OLD_DATA_SPACE", 0x08265): "MinusZeroValue", ("OLD_DATA_SPACE", 0x08271): "PrototypeAccessors", ("CODE_SPACE", 0x12b81): "JsEntryCode", ("CODE_SPACE", 0x12c61): "JsConstructEntryCode", } 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(%s, %s)" % (self.heap.reader.FormatIntPtr(self.address), INSTANCE_TYPES[self.map.instance_type]) def ObjectField(self, offset): field_value = self.heap.reader.ReadUIntPtr(self.address + offset) return self.heap.FindObjectOrSmi(field_value) def SmiField(self, offset): field_value = self.heap.reader.ReadUIntPtr(self.address + offset) assert (field_value & 1) == 0 return field_value / 2 class Map(HeapObject): def InstanceTypeOffset(self): return self.heap.PointerSize() + self.heap.IntSize() def __init__(self, heap, map, address): HeapObject.__init__(self, heap, map, address) self.instance_type = \ heap.reader.ReadU8(self.address + self.InstanceTypeOffset()) class String(HeapObject): def LengthOffset(self): return self.heap.PointerSize() def __init__(self, heap, map, address): HeapObject.__init__(self, heap, map, address) self.length = self.SmiField(self.LengthOffset()) def GetChars(self): return "?string?" def Print(self, p): p.Print(str(self)) def __str__(self): return "\"%s\"" % self.GetChars() class SeqString(String): def CharsOffset(self): return self.heap.PointerSize() * 3 def __init__(self, heap, map, address): String.__init__(self, heap, map, address) self.chars = heap.reader.ReadBytes(self.address + self.CharsOffset(), self.length) def GetChars(self): return self.chars class ExternalString(String): # TODO(vegorov) fix ExternalString for X64 architecture 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): def LeftOffset(self): return self.heap.PointerSize() * 3 def RightOffset(self): return self.heap.PointerSize() * 4 def __init__(self, heap, map, address): String.__init__(self, heap, map, address) self.left = self.ObjectField(self.LeftOffset()) self.right = self.ObjectField(self.RightOffset()) def GetChars(self): try: return self.left.GetChars() + self.right.GetChars() except: return "***CAUGHT EXCEPTION IN GROKDUMP***" class Oddball(HeapObject): # Should match declarations in objects.h KINDS = [ "False", "True", "TheHole", "Null", "ArgumentMarker", "Undefined", "Other" ] def ToStringOffset(self): return self.heap.PointerSize() def ToNumberOffset(self): return self.ToStringOffset() + self.heap.PointerSize() def KindOffset(self): return self.ToNumberOffset() + self.heap.PointerSize() def __init__(self, heap, map, address): HeapObject.__init__(self, heap, map, address) self.to_string = self.ObjectField(self.ToStringOffset()) self.kind = self.SmiField(self.KindOffset()) def Print(self, p): p.Print(str(self)) def __str__(self): if self.to_string: return "Oddball(%08x, <%s>)" % (self.address, self.to_string.GetChars()) else: kind = "???" if 0 <= self.kind < len(Oddball.KINDS): kind = Oddball.KINDS[self.kind] return "Oddball(%08x, kind=%s)" % (self.address, kind) class FixedArray(HeapObject): def LengthOffset(self): return self.heap.PointerSize() def ElementsOffset(self): return self.heap.PointerSize() * 2 def __init__(self, heap, map, address): HeapObject.__init__(self, heap, map, address) self.length = self.SmiField(self.LengthOffset()) def Print(self, p): p.Print("FixedArray(%s) {" % self.heap.reader.FormatIntPtr(self.address)) p.Indent() p.Print("length: %d" % self.length) base_offset = self.ElementsOffset() for i in xrange(self.length): offset = base_offset + 4 * i try: p.Print("[%08d] = %s" % (i, self.ObjectField(offset))) except TypeError: p.Dedent() p.Print("...") p.Print("}") return p.Dedent() p.Print("}") def __str__(self): return "FixedArray(%08x, length=%d)" % (self.address, self.length) class JSFunction(HeapObject): def CodeEntryOffset(self): return 3 * self.heap.PointerSize() def SharedOffset(self): return 5 * self.heap.PointerSize() def __init__(self, heap, map, address): HeapObject.__init__(self, heap, map, address) code_entry = \ heap.reader.ReadU32(self.address + self.CodeEntryOffset()) self.code = heap.FindObject(code_entry - Code.HeaderSize(heap) + 1) self.shared = self.ObjectField(self.SharedOffset()) def Print(self, p): source = "\n".join(" %s" % line for line in self._GetSource().split("\n")) p.Print("JSFunction(%s) {" % self.heap.reader.FormatIntPtr(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(%s, %s)" % \ (self.heap.reader.FormatIntPtr(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): def CodeOffset(self): return 2 * self.heap.PointerSize() def ScriptOffset(self): return 7 * self.heap.PointerSize() def InferredNameOffset(self): return 9 * self.heap.PointerSize() def EndPositionOffset(self): return 12 * self.heap.PointerSize() + 4 * self.heap.IntSize() def StartPositionAndTypeOffset(self): return 12 * self.heap.PointerSize() + 5 * self.heap.IntSize() def __init__(self, heap, map, address): HeapObject.__init__(self, heap, map, address) self.code = self.ObjectField(self.CodeOffset()) self.script = self.ObjectField(self.ScriptOffset()) self.inferred_name = self.ObjectField(self.InferredNameOffset()) if heap.PointerSize() == 8: start_position_and_type = \ heap.reader.ReadU32(self.StartPositionAndTypeOffset()) self.start_position = start_position_and_type >> 2 pseudo_smi_end_position = \ heap.reader.ReadU32(self.EndPositionOffset()) self.end_position = pseudo_smi_end_position >> 2 else: start_position_and_type = \ self.SmiField(self.StartPositionAndTypeOffset()) self.start_position = start_position_and_type >> 2 self.end_position = \ self.SmiField(self.EndPositionOffset()) class Script(HeapObject): def SourceOffset(self): return self.heap.PointerSize() def NameOffset(self): return self.SourceOffset() + self.heap.PointerSize() def __init__(self, heap, map, address): HeapObject.__init__(self, heap, map, address) self.source = self.ObjectField(self.SourceOffset()) self.name = self.ObjectField(self.NameOffset()) class CodeCache(HeapObject): def DefaultCacheOffset(self): return self.heap.PointerSize() def NormalTypeCacheOffset(self): return self.DefaultCacheOffset() + self.heap.PointerSize() def __init__(self, heap, map, address): HeapObject.__init__(self, heap, map, address) self.default_cache = self.ObjectField(self.DefaultCacheOffset()) self.normal_type_cache = self.ObjectField(self.NormalTypeCacheOffset()) def Print(self, p): p.Print("CodeCache(%s) {" % self.heap.reader.FormatIntPtr(self.address)) p.Indent() p.Print("default cache: %s" % self.default_cache) p.Print("normal type cache: %s" % self.normal_type_cache) p.Dedent() p.Print("}") class Code(HeapObject): CODE_ALIGNMENT_MASK = (1 << 5) - 1 def InstructionSizeOffset(self): return self.heap.PointerSize() @staticmethod def HeaderSize(heap): return (heap.PointerSize() + heap.IntSize() + \ 4 * heap.PointerSize() + 3 * heap.IntSize() + \ Code.CODE_ALIGNMENT_MASK) & ~Code.CODE_ALIGNMENT_MASK def __init__(self, heap, map, address): HeapObject.__init__(self, heap, map, address) self.entry = self.address + Code.HeaderSize(heap) self.instruction_size = \ heap.reader.ReadU32(self.address + self.InstructionSizeOffset()) def Print(self, p): lines = self.heap.reader.GetDisasmLines(self.entry, self.instruction_size) p.Print("Code(%s) {" % self.heap.reader.FormatIntPtr(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, "SHORT_EXTERNAL_SYMBOL_TYPE": ExternalString, "SHORT_EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE": ExternalString, "SHORT_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_CACHE_TYPE": CodeCache, "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 & self.ObjectAlignmentMask()) != 1: return None address = tagged_address - 1 if not self.reader.IsValidAddress(address): return None map_tagged_address = self.reader.ReadUIntPtr(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.FindMap(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 def FindMap(self, tagged_address): if (tagged_address & self.MapAlignmentMask()) != 1: return None address = tagged_address - 1 if not self.reader.IsValidAddress(address): return None object = Map(self, None, address) return object def IntSize(self): return 4 def PointerSize(self): return self.reader.PointerSize() def ObjectAlignmentMask(self): return self.PointerSize() - 1 def MapAlignmentMask(self): if self.reader.arch == MD_CPU_ARCHITECTURE_AMD64: return (1 << 4) - 1 elif self.reader.arch == MD_CPU_ARCHITECTURE_X86: return (1 << 5) - 1 def PageAlignmentMask(self): return (1 << 20) - 1 class KnownObject(HeapObject): def __init__(self, heap, known_name): HeapObject.__init__(self, heap, None, None) self.known_name = known_name def __str__(self): return "<%s>" % self.known_name class KnownMap(HeapObject): def __init__(self, heap, known_name, instance_type): HeapObject.__init__(self, heap, None, None) self.instance_type = instance_type self.known_name = known_name def __str__(self): return "<%s>" % self.known_name class InspectionPadawan(object): """The padawan can improve annotations by sensing well-known objects.""" def __init__(self, reader, heap): self.reader = reader self.heap = heap self.known_first_map_page = 0 self.known_first_data_page = 0 self.known_first_pointer_page = 0 def __getattr__(self, name): """An InspectionPadawan can be used instead of V8Heap, even though it does not inherit from V8Heap (aka. mixin).""" return getattr(self.heap, name) def GetPageOffset(self, tagged_address): return tagged_address & self.heap.PageAlignmentMask() def IsInKnownMapSpace(self, tagged_address): page_address = tagged_address & ~self.heap.PageAlignmentMask() return page_address == self.known_first_map_page def IsInKnownOldSpace(self, tagged_address): page_address = tagged_address & ~self.heap.PageAlignmentMask() return page_address in [self.known_first_data_page, self.known_first_pointer_page] def ContainingKnownOldSpaceName(self, tagged_address): page_address = tagged_address & ~self.heap.PageAlignmentMask() if page_address == self.known_first_data_page: return "OLD_DATA_SPACE" if page_address == self.known_first_pointer_page: return "OLD_POINTER_SPACE" return None def SenseObject(self, tagged_address): if self.IsInKnownOldSpace(tagged_address): offset = self.GetPageOffset(tagged_address) lookup_key = (self.ContainingKnownOldSpaceName(tagged_address), offset) known_obj_name = KNOWN_OBJECTS.get(lookup_key) if known_obj_name: return KnownObject(self, known_obj_name) if self.IsInKnownMapSpace(tagged_address): known_map = self.SenseMap(tagged_address) if known_map: return known_map found_obj = self.heap.FindObject(tagged_address) if found_obj: return found_obj address = tagged_address - 1 if self.reader.IsValidAddress(address): map_tagged_address = self.reader.ReadUIntPtr(address) map = self.SenseMap(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) return cls(self, map, address) return None def SenseMap(self, tagged_address): if self.IsInKnownMapSpace(tagged_address): offset = self.GetPageOffset(tagged_address) known_map_info = KNOWN_MAPS.get(offset) if known_map_info: known_map_type, known_map_name = known_map_info return KnownMap(self, known_map_name, known_map_type) found_map = self.heap.FindMap(tagged_address) if found_map: return found_map return None def FindObjectOrSmi(self, tagged_address): """When used as a mixin in place of V8Heap.""" found_obj = self.SenseObject(tagged_address) if found_obj: return found_obj if (tagged_address & 1) == 0: return "Smi(%d)" % (tagged_address / 2) else: return "Unknown(%s)" % self.reader.FormatIntPtr(tagged_address) def FindObject(self, tagged_address): """When used as a mixin in place of V8Heap.""" raise NotImplementedError def FindMap(self, tagged_address): """When used as a mixin in place of V8Heap.""" raise NotImplementedError def PrintKnowledge(self): print " known_first_map_page = %s\n"\ " known_first_data_page = %s\n"\ " known_first_pointer_page = %s" % ( self.reader.FormatIntPtr(self.known_first_map_page), self.reader.FormatIntPtr(self.known_first_data_page), self.reader.FormatIntPtr(self.known_first_pointer_page)) class InspectionShell(cmd.Cmd): def __init__(self, reader, heap): cmd.Cmd.__init__(self) self.reader = reader self.heap = heap self.padawan = InspectionPadawan(reader, heap) self.prompt = "(grok) " def do_da(self, address): """ Print ASCII string starting at specified address. """ address = int(address, 16) string = "" while self.reader.IsValidAddress(address): code = self.reader.ReadU8(address) if code < 128: string += chr(code) else: break address += 1 if string == "": print "Not an ASCII string at %s" % self.reader.FormatIntPtr(address) else: print "%s\n" % string def do_dd(self, address): """ Interpret memory at the given address (if available) as a sequence of words. Automatic alignment is not performed. """ start = int(address, 16) if (start & self.heap.ObjectAlignmentMask()) != 0: print "Warning: Dumping un-aligned memory, is this what you had in mind?" for slot in xrange(start, start + self.reader.PointerSize() * 10, self.reader.PointerSize()): if not self.reader.IsValidAddress(slot): print "Address is not contained within the minidump!" return maybe_address = self.reader.ReadUIntPtr(slot) heap_object = self.padawan.SenseObject(maybe_address) print "%s: %s %s" % (self.reader.FormatIntPtr(slot), self.reader.FormatIntPtr(maybe_address), heap_object or '') def do_do(self, address): """ Interpret memory at the given address as a V8 object. Automatic alignment makes sure that you can pass tagged as well as un-tagged addresses. """ address = int(address, 16) if (address & self.heap.ObjectAlignmentMask()) == 0: address = address + 1 elif (address & self.heap.ObjectAlignmentMask()) != 1: print "Address doesn't look like a valid pointer!" return heap_object = self.padawan.SenseObject(address) if heap_object: heap_object.Print(Printer()) else: print "Address cannot be interpreted as object!" def do_dp(self, address): """ Interpret memory at the given address as being on a V8 heap page and print information about the page header (if available). """ address = int(address, 16) page_address = address & ~self.heap.PageAlignmentMask() if self.reader.IsValidAddress(page_address): raise NotImplementedError else: print "Page header is not available!" def do_k(self, arguments): """ Teach V8 heap layout information to the inspector. This increases the amount of annotations the inspector can produce while dumping data. The first page of each heap space is of particular interest because it contains known objects that do not move. """ self.padawan.PrintKnowledge() def do_kd(self, address): """ Teach V8 heap layout information to the inspector. Set the first data-space page by passing any pointer into that page. """ address = int(address, 16) page_address = address & ~self.heap.PageAlignmentMask() self.padawan.known_first_data_page = page_address def do_km(self, address): """ Teach V8 heap layout information to the inspector. Set the first map-space page by passing any pointer into that page. """ address = int(address, 16) page_address = address & ~self.heap.PageAlignmentMask() self.padawan.known_first_map_page = page_address def do_kp(self, address): """ Teach V8 heap layout information to the inspector. Set the first pointer-space page by passing any pointer into that page. """ address = int(address, 16) page_address = address & ~self.heap.PageAlignmentMask() self.padawan.known_first_pointer_page = page_address def do_list(self, smth): """ List all available memory regions. """ def print_region(reader, start, size, location): print " %s - %s (%d bytes)" % (reader.FormatIntPtr(start), reader.FormatIntPtr(start + size), size) print "Available memory regions:" self.reader.ForEachMemoryRegion(print_region) def do_s(self, word): """ Search for a given word in available memory regions. The given word is expanded to full pointer size and searched at aligned as well as un-aligned memory locations. Use 'sa' to search aligned locations only. """ try: word = int(word, 0) except ValueError: print "Malformed word, prefix with '0x' to use hexadecimal format." return print "Searching for word %d/0x%s:" % (word, self.reader.FormatIntPtr(word)) self.reader.FindWord(word) def do_sh(self, none): """ Search for the V8 Heap object in all available memory regions. You might get lucky and find this rare treasure full of invaluable information. """ raise NotImplementedError def do_u(self, args): """ u 0x
0x Unassemble memory in the region [address, address + size) """ args = args.split(' ') start = int(args[0], 16) size = int(args[1], 16) lines = self.reader.GetDisasmLines(start, size) for line in lines: print FormatDisasmLine(start, self.heap, line) print EIP_PROXIMITY = 64 CONTEXT_FOR_ARCH = { MD_CPU_ARCHITECTURE_AMD64: ['rax', 'rbx', 'rcx', 'rdx', 'rdi', 'rsi', 'rbp', 'rsp', 'rip', 'r8', 'r9', 'r10', 'r11', 'r12', 'r13', 'r14', 'r15'], MD_CPU_ARCHITECTURE_X86: ['eax', 'ebx', 'ecx', 'edx', 'edi', 'esi', 'ebp', 'esp', 'eip'] } def AnalyzeMinidump(options, minidump_name): reader = MinidumpReader(options, minidump_name) heap = None DebugPrint("========================================") if reader.exception is None: print "Minidump has no exception info" else: 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:" for r in CONTEXT_FOR_ARCH[reader.arch]: print " %s: %s" % (r, reader.FormatIntPtr(reader.Register(r))) # TODO(vitalyr): decode eflags. print " eflags: %s" % bin(reader.exception_context.eflags)[2:] print stack_top = reader.ExceptionSP() stack_bottom = exception_thread.stack.start + \ exception_thread.stack.memory.data_size stack_map = {reader.ExceptionIP(): -1} for slot in xrange(stack_top, stack_bottom, reader.PointerSize()): maybe_address = reader.ReadUIntPtr(slot) if not maybe_address in stack_map: stack_map[maybe_address] = slot heap = V8Heap(reader, stack_map) print "Disassembly around exception.eip:" disasm_start = reader.ExceptionIP() - EIP_PROXIMITY disasm_bytes = 2 * EIP_PROXIMITY if (options.full): full_range = reader.FindRegion(reader.ExceptionIP()) if full_range is not None: disasm_start = full_range[0] disasm_bytes = full_range[1] lines = reader.GetDisasmLines(disasm_start, disasm_bytes) for line in lines: print FormatDisasmLine(disasm_start, heap, line) print if heap is None: heap = V8Heap(reader, None) if options.full: FullDump(reader, heap) if options.shell: InspectionShell(reader, heap).cmdloop("type help to get help") else: if reader.exception is not None: print "Annotated stack (from exception.esp to bottom):" for slot in xrange(stack_top, stack_bottom, reader.PointerSize()): maybe_address = reader.ReadUIntPtr(slot) heap_object = heap.FindObject(maybe_address) print "%s: %s" % (reader.FormatIntPtr(slot), reader.FormatIntPtr(maybe_address)) if heap_object: heap_object.Print(Printer()) print reader.Dispose() if __name__ == "__main__": parser = optparse.OptionParser(USAGE) parser.add_option("-s", "--shell", dest="shell", action="store_true", help="start an interactive inspector shell") parser.add_option("-f", "--full", dest="full", action="store_true", help="dump all information contained in the minidump") options, args = parser.parse_args() if len(args) != 1: parser.print_help() sys.exit(1) AnalyzeMinidump(options, args[0])