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fbchisellldbbase.py
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fbchisellldbbase.py
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#!/usr/bin/python
# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.
import json
import shlex
import lldb
class FBCommandArgument: # noqa B903
def __init__(
self, short="", long="", arg="", type="", help="", default="", boolean=False
):
self.shortName = short
self.longName = long
self.argName = arg
self.argType = type
self.help = help
self.default = default
self.boolean = boolean
class FBCommand:
def name(self):
return None
def options(self):
return []
def args(self):
return []
def description(self):
return ""
def lex(self, commandLine):
return shlex.split(commandLine)
def run(self, arguments, option):
pass
def isSuccess(error):
# When evaluating a `void` expression, the returned value will indicate an
# error. This error is named: kNoResult. This error value does *not* mean
# there was a problem. This logic follows what the builtin `expression`
# command does. See: https://git.io/vwpjl (UserExpression.h)
kNoResult = 0x1001
return error.success or error.value == kNoResult
def importModule(frame, module):
options = lldb.SBExpressionOptions()
options.SetLanguage(lldb.eLanguageTypeObjC)
value = frame.EvaluateExpression("@import " + module, options)
return isSuccess(value.error)
# evaluates expression in Objective-C++ context, so it will work even for
# Swift projects
def evaluateExpressionValue(
expression,
printErrors=True,
language=lldb.eLanguageTypeObjC_plus_plus,
tryAllThreads=False,
):
frame = (
lldb.debugger.GetSelectedTarget()
.GetProcess()
.GetSelectedThread()
.GetSelectedFrame()
)
options = lldb.SBExpressionOptions()
options.SetLanguage(language)
# Allow evaluation that contains a @throw/@catch.
# By default, ObjC @throw will cause evaluation to be aborted. At the time
# of a @throw, it's not known if the exception will be handled by a @catch.
# An exception that's caught, should not cause evaluation to fail.
options.SetTrapExceptions(False)
# Give evaluation more time.
options.SetTimeoutInMicroSeconds(5000000) # 5s
# Most Chisel commands are not multithreaded.
options.SetTryAllThreads(tryAllThreads)
value = frame.EvaluateExpression(expression, options)
error = value.GetError()
# Retry if the error could be resolved by first importing UIKit.
if (
error.type == lldb.eErrorTypeExpression
and error.value == lldb.eExpressionParseError
and importModule(frame, "UIKit")
):
value = frame.EvaluateExpression(expression, options)
error = value.GetError()
if printErrors and not isSuccess(error):
print(error)
return value
def evaluateInputExpression(expression, printErrors=True):
# HACK
if expression.startswith("(id)"):
return evaluateExpressionValue(expression, printErrors=printErrors).GetValue()
frame = (
lldb.debugger.GetSelectedTarget()
.GetProcess()
.GetSelectedThread()
.GetSelectedFrame()
)
options = lldb.SBExpressionOptions()
options.SetTrapExceptions(False)
value = frame.EvaluateExpression(expression, options)
error = value.GetError()
if printErrors and error.Fail():
print(error)
return value.GetValue()
def evaluateIntegerExpression(expression, printErrors=True):
output = evaluateExpression("(int)(" + expression + ")", printErrors).replace(
"'", ""
)
if output.startswith("\\x"): # Booleans may display as \x01 (Hex)
output = output[2:]
elif output.startswith("\\"): # Or as \0 (Dec)
output = output[1:]
return int(output, 0)
def evaluateBooleanExpression(expression, printErrors=True):
return (
int(evaluateIntegerExpression("(BOOL)(" + expression + ")", printErrors)) != 0
)
def evaluateExpression(expression, printErrors=True):
return evaluateExpressionValue(expression, printErrors=printErrors).GetValue()
def describeObject(expression, printErrors=True):
return evaluateExpressionValue(
"(id)(" + expression + ")", printErrors
).GetObjectDescription()
def evaluateEffect(expression, printErrors=True):
evaluateExpressionValue("(void)(" + expression + ")", printErrors=printErrors)
def evaluateObjectExpression(expression, printErrors=True):
return evaluateExpression("(id)(" + expression + ")", printErrors)
def evaluateCStringExpression(expression, printErrors=True):
ret = evaluateExpression(expression, printErrors)
process = lldb.debugger.GetSelectedTarget().GetProcess()
error = lldb.SBError()
ret = process.ReadCStringFromMemory(int(ret, 16), 256, error)
if error.Success():
return ret
else:
if printErrors:
print(error)
return None
RETURN_MACRO = """
#define IS_JSON_OBJ(obj)\
(obj != nil && ((bool)[NSJSONSerialization isValidJSONObject:obj] ||\
(bool)[obj isKindOfClass:[NSString class]] ||\
(bool)[obj isKindOfClass:[NSNumber class]]))
#define RETURN(ret) ({\
if (!IS_JSON_OBJ(ret)) {\
(void)[NSException raise:@"Invalid RETURN argument" format:@""];\
}\
NSDictionary *__dict = @{@"return":ret};\
NSData *__data = (id)[NSJSONSerialization dataWithJSONObject:__dict options:0 error:NULL];\
NSString *__str = (id)[[NSString alloc] initWithData:__data encoding:4];\
(char *)[__str UTF8String];})
#define RETURNCString(ret)\
({NSString *___cstring_ret = [NSString stringWithUTF8String:ret];\
RETURN(___cstring_ret);})
"""
def check_expr(expr):
return expr.strip().split(";")[-2].find("RETURN") != -1
# evaluate a batch of Objective-C expressions, the last expression
# must contain a RETURN marco and it will automatic transform the
# Objective-C object to Python object
# Example:
# >>> fbchisellldbbase.evaluate('NSString *str = @"hello world"; RETURN(@{@"key": str});')
# {u'key': u'hello world'}
def evaluate(expr):
if not check_expr(expr):
raise Exception(
"Invalid Expression, the last expression not include a RETURN family marco"
)
command = "({" + RETURN_MACRO + "\n" + expr + "})"
ret = evaluateExpressionValue(command, printErrors=True)
if not ret.GetError().Success():
print(ret.GetError())
return None
else:
process = lldb.debugger.GetSelectedTarget().GetProcess()
error = lldb.SBError()
ret = process.ReadCStringFromMemory(int(ret.GetValue(), 16), 2**20, error)
if not error.Success():
print(error)
return None
else:
ret = json.loads(ret)
return ret["return"]
def currentLanguage():
return (
lldb.debugger.GetSelectedTarget()
.GetProcess()
.GetSelectedThread()
.GetSelectedFrame()
.GetCompileUnit()
.GetLanguage()
)