scripts/symbol.py - platform/development - Git at Google

 #!/usr/bin/python
 #
 # Copyright 2006 Google Inc. All Rights Reserved.

 """Module for looking up symbolic debugging information.

 The information can include symbol names, offsets, and source locations.
 """

 import os
 import re
 import subprocess

 ANDROID_BUILD_TOP = os.environ["ANDROID_BUILD_TOP"]
 if not ANDROID_BUILD_TOP:
   ANDROID_BUILD_TOP = "."

 def FindSymbolsDir():
   saveddir = os.getcwd()
   os.chdir(ANDROID_BUILD_TOP)
   try:
     cmd = ("CALLED_FROM_SETUP=true BUILD_SYSTEM=build/core "
            "SRC_TARGET_DIR=build/target make -f build/core/config.mk "
            "dumpvar-abs-TARGET_OUT_UNSTRIPPED")
     stream = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=True).stdout
     return os.path.join(ANDROID_BUILD_TOP, stream.read().strip())
   finally:
     os.chdir(saveddir)

 SYMBOLS_DIR = FindSymbolsDir()

 def Uname():
   """'uname' for constructing prebuilt/<...> and out/host/<...> paths."""
   uname = os.uname()[0]
   if uname == "Darwin":
     proc = os.uname()[-1]
     if proc == "i386" or proc == "x86_64":
       return "darwin-x86"
     return "darwin-ppc"
   if uname == "Linux":
     return "linux-x86"
   return uname

 def ToolPath(tool, toolchain_info=None):
   """Return a full qualified path to the specified tool"""
   if not toolchain_info:
     toolchain_info = TOOLCHAIN_INFO
   (label, target) = toolchain_info
   return os.path.join(ANDROID_BUILD_TOP, "prebuilts", "gcc", Uname(), "arm", label, "bin",
                      target + "-" + tool)

 def FindToolchain():
   """Look for the latest available toolchain

   Args:
     None

   Returns:
     A pair of strings containing toolchain label and target prefix.
   """

   ## Known toolchains, newer ones in the front.
   known_toolchains = [
     ("arm-eabi-4.6", "arm-eabi"),
     ("arm-linux-androideabi-4.4.x", "arm-linux-androideabi"),
     ("arm-eabi-4.4.3", "arm-eabi"),
     ("arm-eabi-4.4.0", "arm-eabi"),
     ("arm-eabi-4.3.1", "arm-eabi"),
     ("arm-eabi-4.2.1", "arm-eabi")
   ]

   # Look for addr2line to check for valid toolchain path.
   for (label, target) in known_toolchains:
     toolchain_info = (label, target);
     if os.path.exists(ToolPath("addr2line", toolchain_info)):
       return toolchain_info

   raise Exception("Could not find tool chain")

 TOOLCHAIN_INFO = FindToolchain()

 def SymbolInformation(lib, addr):
   """Look up symbol information about an address.

   Args:
     lib: library (or executable) pathname containing symbols
     addr: string hexidecimal address

   Returns:
     For a given library and address, return tuple of: (source_symbol,
     source_location, object_symbol_with_offset) the values may be None
     if the information was unavailable.

     source_symbol may not be a prefix of object_symbol_with_offset if
     the source function was inlined in the object code of another
     function.

     usually you want to display the object_symbol_with_offset and
     source_location, the source_symbol is only useful to show if the
     address was from an inlined function.
   """
   info = SymbolInformationForSet(lib, set([addr]))
   return (info and info.get(addr)) or (None, None, None)


 def SymbolInformationForSet(lib, unique_addrs):
   """Look up symbol information for a set of addresses from the given library.

   Args:
     lib: library (or executable) pathname containing symbols
     unique_addrs: set of hexidecimal addresses

   Returns:
     For a given library and set of addresses, returns a dictionary of the form
     {addr: (source_symbol, source_location, object_symbol_with_offset)}. The
     values may be None if the information was unavailable.

     For a given address, source_symbol may not be a prefix of
     object_symbol_with_offset if the source function was inlined in the
     object code of another function.

     Usually you want to display the object_symbol_with_offset and
     source_location; the source_symbol is only useful to show if the
     address was from an inlined function.
   """
   if not lib:
     return None

   addr_to_line = CallAddr2LineForSet(lib, unique_addrs)
   if not addr_to_line:
     return None

   addr_to_objdump = CallObjdumpForSet(lib, unique_addrs)
   if not addr_to_objdump:
     return None

   result = {}
   for addr in unique_addrs:
     (source_symbol, source_location) = addr_to_line.get(addr, (None, None))
     if addr in addr_to_objdump:
       (object_symbol, object_offset) = addr_to_objdump.get(addr)
       object_symbol_with_offset = FormatSymbolWithOffset(object_symbol,
                                                          object_offset)
     else:
       object_symbol_with_offset = None
     result[addr] = (source_symbol, source_location, object_symbol_with_offset)

   return result


 def CallAddr2LineForSet(lib, unique_addrs):
   """Look up line and symbol information for a set of addresses.

   Args:
     lib: library (or executable) pathname containing symbols
     unique_addrs: set of string hexidecimal addresses look up.

   Returns:
     A dictionary of the form {addr: (symbol, file:line)}. The values may
     be (None, None) if the address could not be looked up.
   """
   if not lib:
     return None


   symbols = SYMBOLS_DIR + lib
   if not os.path.exists(symbols):
     return None

   (label, target) = TOOLCHAIN_INFO
   cmd = [ToolPath("addr2line"), "--functions", "--demangle", "--exe=" + symbols]
   child = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE)

   result = {}
   addrs = sorted(unique_addrs)
   for addr in addrs:
     child.stdin.write("0x%s\n" % addr)
     child.stdin.flush()
     symbol = child.stdout.readline().strip()
     if symbol == "??":
       symbol = None
     location = child.stdout.readline().strip()
     if location == "??:0":
       location = None
     result[addr] = (symbol, location)
   child.stdin.close()
   child.stdout.close()
   return result


 def CallObjdumpForSet(lib, unique_addrs):
   """Use objdump to find out the names of the containing functions.

   Args:
     lib: library (or executable) pathname containing symbols
     unique_addrs: set of string hexidecimal addresses to find the functions for.

   Returns:
     A dictionary of the form {addr: (string symbol, offset)}.
   """
   if not lib:
     return None

   symbols = SYMBOLS_DIR + lib
   if not os.path.exists(symbols):
     return None

   symbols = SYMBOLS_DIR + lib
   if not os.path.exists(symbols):
     return None

   addrs = sorted(unique_addrs)
   start_addr_hex = addrs[0]
   stop_addr_dec = str(int(addrs[-1], 16) + 8)
   cmd = [ToolPath("objdump"),
          "--section=.text",
          "--demangle",
          "--disassemble",
          "--start-address=0x" + start_addr_hex,
          "--stop-address=" + stop_addr_dec,
          symbols]

   # Function lines look like:
   #   000177b0 <android::IBinder::~IBinder()+0x2c>:
   # We pull out the address and function first. Then we check for an optional
   # offset. This is tricky due to functions that look like "operator+(..)+0x2c"
   func_regexp = re.compile("(^[a-f0-9]*) \<(.*)\>:$")
   offset_regexp = re.compile("(.*)\+0x([a-f0-9]*)")

   # A disassembly line looks like:
   #   177b2:	b510      	push	{r4, lr}
   asm_regexp = re.compile("(^[ a-f0-9]*):[ a-f0-0]*.*$")

   current_symbol = None    # The current function symbol in the disassembly.
   current_symbol_addr = 0  # The address of the current function.
   addr_index = 0  # The address that we are currently looking for.

   stream = subprocess.Popen(cmd, stdout=subprocess.PIPE).stdout
   result = {}
   for line in stream:
     # Is it a function line like:
     #   000177b0 <android::IBinder::~IBinder()>:
     components = func_regexp.match(line)
     if components:
       # This is a new function, so record the current function and its address.
       current_symbol_addr = int(components.group(1), 16)
       current_symbol = components.group(2)

       # Does it have an optional offset like: "foo(..)+0x2c"?
       components = offset_regexp.match(current_symbol)
       if components:
         current_symbol = components.group(1)
         offset = components.group(2)
         if offset:
           current_symbol_addr -= int(offset, 16)

     # Is it an disassembly line like:
     #   177b2:	b510      	push	{r4, lr}
     components = asm_regexp.match(line)
     if components:
       addr = components.group(1)
       target_addr = addrs[addr_index]
       i_addr = int(addr, 16)
       i_target = int(target_addr, 16)
       if i_addr == i_target:
         result[target_addr] = (current_symbol, i_target - current_symbol_addr)
         addr_index += 1
         if addr_index >= len(addrs):
           break
   stream.close()

   return result


 def CallCppFilt(mangled_symbol):
   cmd = [ToolPath("c++filt")]
   process = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
   process.stdin.write(mangled_symbol)
   process.stdin.write("\n")
   process.stdin.close()
   demangled_symbol = process.stdout.readline().strip()
   process.stdout.close()
   return demangled_symbol

 def FormatSymbolWithOffset(symbol, offset):
   if offset == 0:
     return symbol
   return "%s+%d" % (symbol, offset)
	#!/usr/bin/python
	#
	# Copyright 2006 Google Inc. All Rights Reserved.

	"""Module for looking up symbolic debugging information.

	The information can include symbol names, offsets, and source locations.
	"""

	import os
	import re
	import subprocess

	ANDROID_BUILD_TOP = os.environ["ANDROID_BUILD_TOP"]
	if not ANDROID_BUILD_TOP:
	ANDROID_BUILD_TOP = "."

	def FindSymbolsDir():
	saveddir = os.getcwd()
	os.chdir(ANDROID_BUILD_TOP)
	try:
	cmd = ("CALLED_FROM_SETUP=true BUILD_SYSTEM=build/core "
	"SRC_TARGET_DIR=build/target make -f build/core/config.mk "
	"dumpvar-abs-TARGET_OUT_UNSTRIPPED")
	stream = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=True).stdout
	return os.path.join(ANDROID_BUILD_TOP, stream.read().strip())
	finally:
	os.chdir(saveddir)

	SYMBOLS_DIR = FindSymbolsDir()

	def Uname():
	"""'uname' for constructing prebuilt/<...> and out/host/<...> paths."""
	uname = os.uname()[0]
	if uname == "Darwin":
	proc = os.uname()[-1]
	if proc == "i386" or proc == "x86_64":
	return "darwin-x86"
	return "darwin-ppc"
	if uname == "Linux":
	return "linux-x86"
	return uname

	def ToolPath(tool, toolchain_info=None):
	"""Return a full qualified path to the specified tool"""
	if not toolchain_info:
	toolchain_info = TOOLCHAIN_INFO
	(label, target) = toolchain_info
	return os.path.join(ANDROID_BUILD_TOP, "prebuilts", "gcc", Uname(), "arm", label, "bin",
	target + "-" + tool)

	def FindToolchain():
	"""Look for the latest available toolchain

	Args:
	None

	Returns:
	A pair of strings containing toolchain label and target prefix.
	"""

	## Known toolchains, newer ones in the front.
	known_toolchains = [
	("arm-eabi-4.6", "arm-eabi"),
	("arm-linux-androideabi-4.4.x", "arm-linux-androideabi"),
	("arm-eabi-4.4.3", "arm-eabi"),
	("arm-eabi-4.4.0", "arm-eabi"),
	("arm-eabi-4.3.1", "arm-eabi"),
	("arm-eabi-4.2.1", "arm-eabi")
	]

	# Look for addr2line to check for valid toolchain path.
	for (label, target) in known_toolchains:
	toolchain_info = (label, target);
	if os.path.exists(ToolPath("addr2line", toolchain_info)):
	return toolchain_info

	raise Exception("Could not find tool chain")

	TOOLCHAIN_INFO = FindToolchain()

	def SymbolInformation(lib, addr):
	"""Look up symbol information about an address.

	Args:
	lib: library (or executable) pathname containing symbols
	addr: string hexidecimal address

	Returns:
	For a given library and address, return tuple of: (source_symbol,
	source_location, object_symbol_with_offset) the values may be None
	if the information was unavailable.

	source_symbol may not be a prefix of object_symbol_with_offset if
	the source function was inlined in the object code of another
	function.

	usually you want to display the object_symbol_with_offset and
	source_location, the source_symbol is only useful to show if the
	address was from an inlined function.
	"""
	info = SymbolInformationForSet(lib, set([addr]))
	return (info and info.get(addr)) or (None, None, None)


	def SymbolInformationForSet(lib, unique_addrs):
	"""Look up symbol information for a set of addresses from the given library.

	Args:
	lib: library (or executable) pathname containing symbols
	unique_addrs: set of hexidecimal addresses

	Returns:
	For a given library and set of addresses, returns a dictionary of the form
	{addr: (source_symbol, source_location, object_symbol_with_offset)}. The
	values may be None if the information was unavailable.

	For a given address, source_symbol may not be a prefix of
	object_symbol_with_offset if the source function was inlined in the
	object code of another function.

	Usually you want to display the object_symbol_with_offset and
	source_location; the source_symbol is only useful to show if the
	address was from an inlined function.
	"""
	if not lib:
	return None

	addr_to_line = CallAddr2LineForSet(lib, unique_addrs)
	if not addr_to_line:
	return None

	addr_to_objdump = CallObjdumpForSet(lib, unique_addrs)
	if not addr_to_objdump:
	return None

	result = {}
	for addr in unique_addrs:
	(source_symbol, source_location) = addr_to_line.get(addr, (None, None))
	if addr in addr_to_objdump:
	(object_symbol, object_offset) = addr_to_objdump.get(addr)
	object_symbol_with_offset = FormatSymbolWithOffset(object_symbol,
	object_offset)
	else:
	object_symbol_with_offset = None
	result[addr] = (source_symbol, source_location, object_symbol_with_offset)

	return result


	def CallAddr2LineForSet(lib, unique_addrs):
	"""Look up line and symbol information for a set of addresses.

	Args:
	lib: library (or executable) pathname containing symbols
	unique_addrs: set of string hexidecimal addresses look up.

	Returns:
	A dictionary of the form {addr: (symbol, file:line)}. The values may
	be (None, None) if the address could not be looked up.
	"""
	if not lib:
	return None


	symbols = SYMBOLS_DIR + lib
	if not os.path.exists(symbols):
	return None

	(label, target) = TOOLCHAIN_INFO
	cmd = [ToolPath("addr2line"), "--functions", "--demangle", "--exe=" + symbols]
	child = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE)

	result = {}
	addrs = sorted(unique_addrs)
	for addr in addrs:
	child.stdin.write("0x%s\n" % addr)
	child.stdin.flush()
	symbol = child.stdout.readline().strip()
	if symbol == "??":
	symbol = None
	location = child.stdout.readline().strip()
	if location == "??:0":
	location = None
	result[addr] = (symbol, location)
	child.stdin.close()
	child.stdout.close()
	return result


	def CallObjdumpForSet(lib, unique_addrs):
	"""Use objdump to find out the names of the containing functions.

	Args:
	lib: library (or executable) pathname containing symbols
	unique_addrs: set of string hexidecimal addresses to find the functions for.

	Returns:
	A dictionary of the form {addr: (string symbol, offset)}.
	"""
	if not lib:
	return None

	symbols = SYMBOLS_DIR + lib
	if not os.path.exists(symbols):
	return None

	symbols = SYMBOLS_DIR + lib
	if not os.path.exists(symbols):
	return None

	addrs = sorted(unique_addrs)
	start_addr_hex = addrs[0]
	stop_addr_dec = str(int(addrs[-1], 16) + 8)
	cmd = [ToolPath("objdump"),
	"--section=.text",
	"--demangle",
	"--disassemble",
	"--start-address=0x" + start_addr_hex,
	"--stop-address=" + stop_addr_dec,
	symbols]

	# Function lines look like:
	# 000177b0 <android::IBinder::~IBinder()+0x2c>:
	# We pull out the address and function first. Then we check for an optional
	# offset. This is tricky due to functions that look like "operator+(..)+0x2c"
	func_regexp = re.compile("(^[a-f0-9]) \<(.)\>:$")
	offset_regexp = re.compile("(.)\+0x([a-f0-9])")

	# A disassembly line looks like:
	# 177b2: b510 push {r4, lr}
	asm_regexp = re.compile("(^[ a-f0-9]):[ a-f0-0].*$")

	current_symbol = None # The current function symbol in the disassembly.
	current_symbol_addr = 0 # The address of the current function.
	addr_index = 0 # The address that we are currently looking for.

	stream = subprocess.Popen(cmd, stdout=subprocess.PIPE).stdout
	result = {}
	for line in stream:
	# Is it a function line like:
	# 000177b0 <android::IBinder::~IBinder()>:
	components = func_regexp.match(line)
	if components:
	# This is a new function, so record the current function and its address.
	current_symbol_addr = int(components.group(1), 16)
	current_symbol = components.group(2)

	# Does it have an optional offset like: "foo(..)+0x2c"?
	components = offset_regexp.match(current_symbol)
	if components:
	current_symbol = components.group(1)
	offset = components.group(2)
	if offset:
	current_symbol_addr -= int(offset, 16)

	# Is it an disassembly line like:
	# 177b2: b510 push {r4, lr}
	components = asm_regexp.match(line)
	if components:
	addr = components.group(1)
	target_addr = addrs[addr_index]
	i_addr = int(addr, 16)
	i_target = int(target_addr, 16)
	if i_addr == i_target:
	result[target_addr] = (current_symbol, i_target - current_symbol_addr)
	addr_index += 1
	if addr_index >= len(addrs):
	break
	stream.close()

	return result


	def CallCppFilt(mangled_symbol):
	cmd = [ToolPath("c++filt")]
	process = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
	process.stdin.write(mangled_symbol)
	process.stdin.write("\n")
	process.stdin.close()
	demangled_symbol = process.stdout.readline().strip()
	process.stdout.close()
	return demangled_symbol

	def FormatSymbolWithOffset(symbol, offset):
	if offset == 0:
	return symbol
	return "%s+%d" % (symbol, offset)