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2.6 KiB

# Copyright 2017 the V8 project authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import lldb
import re
def jst(debugger, *args):
"""Print the current JavaScript stack trace"""
target = debugger.GetSelectedTarget()
process = target.GetProcess()
thread = process.GetSelectedThread()
frame = thread.GetSelectedFrame()
frame.EvaluateExpression("_v8_internal_Print_StackTrace();")
print("")
def jss(debugger, *args):
"""Skip the jitted stack on x64 to where we entered JS last"""
target = debugger.GetSelectedTarget()
process = target.GetProcess()
thread = process.GetSelectedThread()
frame = thread.GetSelectedFrame()
js_entry_sp = frame.EvaluateExpression(
"v8::internal::Isolate::Current()->thread_local_top()->js_entry_sp_;") \
.GetValue()
sizeof_void = frame.EvaluateExpression("sizeof(void*)").GetValue()
rbp = frame.FindRegister("rbp")
rsp = frame.FindRegister("rsp")
pc = frame.FindRegister("pc")
rbp = js_entry_sp
rsp = js_entry_sp + 2 *sizeof_void
pc.value = js_entry_sp + sizeof_void
def bta(debugger, *args):
"""Print stack trace with assertion scopes"""
func_name_re = re.compile("([^(<]+)(?:\(.+\))?")
assert_re = re.compile(
"^v8::internal::Per\w+AssertType::(\w+)_ASSERT, (false|true)>")
target = debugger.GetSelectedTarget()
process = target.GetProcess()
thread = process.GetSelectedThread()
frame = thread.GetSelectedFrame()
for frame in thread:
functionSignature = frame.GetDisplayFunctionName()
if functionSignature is None:
continue
functionName = func_name_re.match(functionSignature)
line = frame.GetLineEntry().GetLine()
sourceFile = frame.GetLineEntry().GetFileSpec().GetFilename()
if line:
sourceFile = sourceFile + ":" + str(line)
if sourceFile is None:
sourceFile = ""
print("[%-2s] %-60s %-40s" % (frame.GetFrameID(),
functionName.group(1),
sourceFile))
match = assert_re.match(str(functionSignature))
if match:
if match.group(3) == "false":
prefix = "Disallow"
color = "\033[91m"
else:
prefix = "Allow"
color = "\033[92m"
print("%s -> %s %s (%s)\033[0m" % (
color, prefix, match.group(2), match.group(1)))
def __lldb_init_module (debugger, dict):
debugger.HandleCommand('command script add -f lldb_commands.jst jst')
debugger.HandleCommand('command script add -f lldb_commands.jss jss')
debugger.HandleCommand('command script add -f lldb_commands.bta bta')