#!/usr/bin/env python
# ----------------------------------------------------------------------
# Be sure to add the python path that points to the LLDB shared library.
#
# # To use this in the embedded python interpreter using "lldb" just
# import it with the full path using the "command script import"
# command
# (lldb) command script import /path/to/clandiag.py
# ----------------------------------------------------------------------
from __future__ import absolute_import, division, print_function
import lldb
import argparse
import shlex
import os
import re
import subprocess
class MyParser(argparse.ArgumentParser):
def format_help(self):
return """ Commands for managing clang diagnostic breakpoints
Syntax: clangdiag enable [<warning>|<diag-name>]
clangdiag disable
clangdiag diagtool [<path>|reset]
The following subcommands are supported:
enable -- Enable clang diagnostic breakpoints.
disable -- Disable all clang diagnostic breakpoints.
diagtool -- Return, set, or reset diagtool path.
This command sets breakpoints in clang, and clang based tools, that
emit diagnostics. When a diagnostic is emitted, and clangdiag is
enabled, it will use the appropriate diagtool application to determine
the name of the DiagID, and set breakpoints in all locations that
'diag::name' appears in the source. Since the new breakpoints are set
after they are encountered, users will need to launch the executable a
second time in order to hit the new breakpoints.
For in-tree builds, the diagtool application, used to map DiagID's to
names, is found automatically in the same directory as the target
executable. However, out-or-tree builds must use the 'diagtool'
subcommand to set the appropriate path for diagtool in the clang debug
bin directory. Since this mapping is created at build-time, it's
important for users to use the same version that was generated when
clang was compiled, or else the id's won't match.
Notes:
- Substrings can be passed for both <warning> and <diag-name>.
- If <warning> is passed, only enable the DiagID(s) for that warning.
- If <diag-name> is passed, only enable that DiagID.
- Rerunning enable clears existing breakpoints.
- diagtool is used in breakpoint callbacks, so it can be changed
without the need to rerun enable.
- Adding this to your ~.lldbinit file makes clangdiag available at startup:
"command script import /path/to/clangdiag.py"
"""
def create_diag_options():
parser = MyParser(prog="clangdiag")
subparsers = parser.add_subparsers(
title="subcommands", dest="subcommands", metavar=""
)
disable_parser = subparsers.add_parser("disable")
enable_parser = subparsers.add_parser("enable")
enable_parser.add_argument("id", nargs="?")
diagtool_parser = subparsers.add_parser("diagtool")
diagtool_parser.add_argument("path", nargs="?")
return parser
def getDiagtool(target, diagtool=None):
id = target.GetProcess().GetProcessID()
if "diagtool" not in getDiagtool.__dict__:
getDiagtool.diagtool = {}
if diagtool:
if diagtool == "reset":
getDiagtool.diagtool[id] = None
elif os.path.exists(diagtool):
getDiagtool.diagtool[id] = diagtool
else:
print("clangdiag: %s not found." % diagtool)
if not id in getDiagtool.diagtool or not getDiagtool.diagtool[id]:
getDiagtool.diagtool[id] = None
exe = target.GetExecutable()
if not exe.Exists():
print("clangdiag: Target (%s) not set." % exe.GetFilename())
else:
diagtool = os.path.join(exe.GetDirectory(), "diagtool")
if os.path.exists(diagtool):
getDiagtool.diagtool[id] = diagtool
else:
print("clangdiag: diagtool not found along side %s" % exe)
return getDiagtool.diagtool[id]
def setDiagBreakpoint(frame, bp_loc, dict):
id = frame.FindVariable("DiagID").GetValue()
if id is None:
print("clangdiag: id is None")
return False
# Don't need to test this time, since we did that in enable.
target = frame.GetThread().GetProcess().GetTarget()
diagtool = getDiagtool(target)
name = subprocess.check_output([diagtool, "find-diagnostic-id", id]).rstrip()
# Make sure we only consider errors, warnings, and extensions.
# FIXME: Make this configurable?
prefixes = ["err_", "warn_", "exp_"]
if len([prefix for prefix in prefixes + [""] if name.startswith(prefix)][0]):
bp = target.BreakpointCreateBySourceRegex(name, lldb.SBFileSpec())
bp.AddName("clang::Diagnostic")
return False
def enable(exe_ctx, args):
# Always disable existing breakpoints
disable(exe_ctx)
target = exe_ctx.GetTarget()
numOfBreakpoints = target.GetNumBreakpoints()
if args.id:
# Make sure we only consider errors, warnings, and extensions.
# FIXME: Make this configurable?
prefixes = ["err_", "warn_", "exp_"]
if len([prefix for prefix in prefixes + [""] if args.id.startswith(prefix)][0]):
bp = target.BreakpointCreateBySourceRegex(args.id, lldb.SBFileSpec())
bp.AddName("clang::Diagnostic")
else:
diagtool = getDiagtool(target)
list = subprocess.check_output([diagtool, "list-warnings"]).rstrip()
for line in list.splitlines(True):
m = re.search(r" *(.*) .*\[\-W" + re.escape(args.id) + r".*].*", line)
# Make sure we only consider warnings.
if m and m.group(1).startswith("warn_"):
bp = target.BreakpointCreateBySourceRegex(
m.group(1), lldb.SBFileSpec()
)
bp.AddName("clang::Diagnostic")
else:
print("Adding callbacks.")
bp = target.BreakpointCreateByName("DiagnosticsEngine::Report")
bp.SetScriptCallbackFunction("clangdiag.setDiagBreakpoint")
bp.AddName("clang::Diagnostic")
count = target.GetNumBreakpoints() - numOfBreakpoints
print("%i breakpoint%s added." % (count, "s"[count == 1 :]))
return
def disable(exe_ctx):
target = exe_ctx.GetTarget()
# Remove all diag breakpoints.
bkpts = lldb.SBBreakpointList(target)
target.FindBreakpointsByName("clang::Diagnostic", bkpts)
for i in range(bkpts.GetSize()):
target.BreakpointDelete(bkpts.GetBreakpointAtIndex(i).GetID())
return
def the_diag_command(debugger, command, exe_ctx, result, dict):
# Use the Shell Lexer to properly parse up command options just like a
# shell would
command_args = shlex.split(command)
parser = create_diag_options()
try:
args = parser.parse_args(command_args)
except:
return
if args.subcommands == "enable":
enable(exe_ctx, args)
elif args.subcommands == "disable":
disable(exe_ctx)
else:
diagtool = getDiagtool(exe_ctx.GetTarget(), args.path)
print("diagtool = %s" % diagtool)
return
def __lldb_init_module(debugger, dict):
# This initializer is being run from LLDB in the embedded command interpreter
# Make the options so we can generate the help text for the new LLDB
# command line command prior to registering it with LLDB below
parser = create_diag_options()
the_diag_command.__doc__ = parser.format_help()
# Add any commands contained in this module to LLDB
debugger.HandleCommand("command script add -f clangdiag.the_diag_command clangdiag")
print(
'The "clangdiag" command has been installed, type "help clangdiag" or "clangdiag --help" for detailed help.'
)
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