#!/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)) ]) 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: 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 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.rbp 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("{\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", 133: "FOREIGN_TYPE", 134: "BYTE_ARRAY_TYPE", 135: "EXTERNAL_BYTE_ARRAY_TYPE", 136: "EXTERNAL_UNSIGNED_BYTE_ARRAY_TYPE", 137: "EXTERNAL_SHORT_ARRAY_TYPE", 138: "EXTERNAL_UNSIGNED_SHORT_ARRAY_TYPE", 139: "EXTERNAL_INT_ARRAY_TYPE", 140: "EXTERNAL_UNSIGNED_INT_ARRAY_TYPE", 141: "EXTERNAL_FLOAT_ARRAY_TYPE", 143: "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", 156: "POLYMORPHIC_CODE_CACHE_TYPE", 159: "FIXED_ARRAY_TYPE", 160: "SHARED_FUNCTION_INFO_TYPE", 161: "JS_MESSAGE_OBJECT_TYPE", 162: "JS_VALUE_TYPE", 163: "JS_OBJECT_TYPE", 164: "JS_CONTEXT_EXTENSION_OBJECT_TYPE", 165: "JS_GLOBAL_OBJECT_TYPE", 166: "JS_BUILTINS_OBJECT_TYPE", 167: "JS_GLOBAL_PROXY_TYPE", 168: "JS_ARRAY_TYPE", 169: "JS_PROXY_TYPE", 170: "JS_WEAK_MAP_TYPE", 171: "JS_REGEXP_TYPE", 172: "JS_FUNCTION_TYPE", 173: "JS_FUNCTION_PROXY_TYPE", 157: "DEBUG_INFO_TYPE", 158: "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(%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(): 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): return self.left.GetChars() + self.right.GetChars() class Oddball(HeapObject): def ToStringOffset(self): return self.heap.PointerSize() def __init__(self, heap, map, address): HeapObject.__init__(self, heap, map, address) self.to_string = self.ObjectField(self.ToStringOffset()) def Print(self, p): p.Print(str(self)) def __str__(self): return "<%s>" % self.to_string.GetChars() 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 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): 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 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_ALIGNMENT_MASK) & ~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, "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.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.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 def PointerSize(self): return self.reader.PointerSize() EIP_PROXIMITY = 64 CONTEXT_FOR_ARCH = { MD_CPU_ARCHITECTURE_AMD64: ['rax', 'rbx', 'rcx', 'rdx', 'rdi', 'rsi', 'rbp', 'rsp', 'rip'], MD_CPU_ARCHITECTURE_X86: ['eax', 'ebx', 'ecx', 'edx', 'edi', 'esi', 'ebp', 'esp', 'eip'] } 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:" 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:" start = reader.ExceptionIP() - 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(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) options, args = parser.parse_args() if len(args) != 1: parser.print_help() sys.exit(1) AnalyzeMinidump(options, args[0])