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#!/usr/bin/env python3
""" rr-gdb-script-host.py <user-gdb-script> <primary binary name>"""
# Performs a limited emulation of the runtime environment of gdb scripts so that
# we can run them for `rr sources` to locate debug information.
from typing import Optional, List, Callable, Type
import logging
import os
import signal
import sys
def strip_prefix(s: str, needle: str) -> Optional[str]:
if s.startswith(needle):
return s[len(needle):]
return None
def print_wrapper(*args, **kwargs):
# Don't allow the script to print to stdout and interfere
# with our communication with the rr process.
f = kwargs.get("file")
if f is None or f == sys.stdout:
kwargs["file"] = sys.stderr
print(*args, **kwargs)
GdbNewObjfileEventCallback = Callable[[object], None]
class DebuggerExtensionCommand:
def __init__(self, *args, **kwargs):
logging.debug("DebuggerExtensionCommand(%s, %s)" % (args, kwargs))
class GdbScriptHost:
""" The filename of the main symbol file """
_filename: str = ""
""" The current value of the gdb dir """
_dir: str = ""
""" The current value of debug-file-directory """
debug_file_directory: str = "/usr/lib/debug"
new_objfile_events: List[GdbNewObjfileEventCallback] = []
def __init__(self, *args, **kwargs):
self._filename = args[0]
def show(self, cmd: str) -> Optional[str]:
cmd.rstrip()
if cmd == "debug-file-directory":
return self.debug_file_directory
if cmd == "dir":
return "Source directories searched: %s:$cdir:$cwd"%self._dir
return None
def set(self, cmd: str) -> str:
dfd = strip_prefix(cmd, "debug-file-directory ")
if dfd:
self.debug_file_directory = dfd
# Prints nothing upon success.
return ""
# This seems to be the default error message.
return "No symbol table is loaded. Use the \"file\" command."
def execute_script(self, script: str):
gdb_api: GdbApiRoot = GdbApiRoot(self)
exec(script, {'gdb': gdb_api, "print": print_wrapper})
def new_objfile(self, f: str):
new_objfile: GdbNewObjfile = GdbNewObjfile(self, f)
new_objfile_event: GdbNewObjfileEvent = GdbNewObjfileEvent(self, new_objfile)
for callback in self.new_objfile_events:
callback(new_objfile_event)
class GdbApiObject(object):
def __init__(self, *args, **kwargs):
self.gdb = args[0]
def __getattr__(self, attr):
logging.warning("Accessing unsupported GDB api %s.%s" % (self.__class__.__name__, attr))
class GdbProgspace(GdbApiObject):
filename: str
def __init__(self, *args, **kwargs):
GdbApiObject.__init__(self, *args, **kwargs)
self.filename = self.gdb._filename
class GdbNewObjfile(GdbApiObject):
filename: str
def __init__(self, *args, **kwargs):
GdbApiObject.__init__(self, *args, **kwargs)
self.filename = args[1]
class GdbNewObjfileEvent(GdbApiObject):
new_objfile: GdbNewObjfile
def __init__(self, *args, **kwargs):
GdbApiObject.__init__(self, *args, **kwargs)
self.new_objfile = args[1]
class GdbNewObjfileEvents(GdbApiObject):
def connect(self, c: GdbNewObjfileEventCallback):
logging.debug("EventRegistry.connect")
self.gdb.new_objfile_events.append(c)
class GdbApiEvents(GdbApiObject):
_new_objfile: Optional[GdbNewObjfileEvents] = None
@property
def new_objfile(self) -> GdbNewObjfileEvents:
logging.debug("gdb.events.new_objfile")
if self._new_objfile is None:
self._new_objfile = GdbNewObjfileEvents(self.gdb)
return self._new_objfile
class GdbApiRoot(GdbApiObject):
_events: Optional[GdbApiEvents] = None
_current_progspace: Optional[GdbProgspace] = None
def execute(self, command: str, from_tty: bool = False, to_string: bool = False) -> Optional[str]:
logging.debug("gdb.execute(\"%s\", from_tty=%s, to_string=%s)" % (command, str(from_tty), str(to_string)))
if from_tty:
logging.warning("Unsupported gdb.execute with from_tty == True")
return None
remainder = strip_prefix(command, "show ")
if remainder:
r = self.gdb.show(remainder)
if to_string:
return r
else:
print(r, file=sys.stderr)
return None
remainder = strip_prefix(command, "set ")
if remainder:
r = self.gdb.set(remainder)
if to_string:
return r
else:
print(r, file=sys.stderr)
return None
remainder = strip_prefix(command, "dir ")
if remainder:
self.gdb._dir = remainder
s = "Source directories searched: %s:$cdir:$cwd"%remainder
if to_string:
return s
else:
print(s, file=sys.stderr)
return None
logging.warning("Unsupported gdb.execute \"%s\""%command)
return None
def lookup_global_symbol(self, s: str) -> Optional[object]:
#logging.debug("gdb.lookup_global_symbol(\"%s\")"%s)
logging.warning("gdb.lookup_global_symbol(\"%s\") is not yet implemented, pretending we found something"%s)
return object()
def current_progspace(self) -> GdbProgspace:
logging.debug("gdb.current_progspace()")
if self._current_progspace is None:
self._current_progspace = GdbProgspace(self.gdb)
return self._current_progspace
@property
def events(self) -> GdbApiEvents:
logging.debug("gdb.events")
if self._events is None:
self._events = GdbApiEvents(self.gdb)
return self._events
@property
def COMMAND_USER(self) -> int:
return 13
@property
def Command(self) -> Type[DebuggerExtensionCommand]:
return DebuggerExtensionCommand
if __name__ == '__main__':
with open(sys.argv[1], 'r') as user_script_file:
user_script = user_script_file.read()
host = GdbScriptHost(sys.argv[2])
try:
host.execute_script(user_script)
except NameError as e:
if getattr(e, "name", None) == "python" or e == "NameError: name 'python' is not defined":
# This might be a gdb script that wraps a python script.
start = user_script.find("python") + len("python")
end = user_script.find("end")
if end == -1:
raise(e)
user_script = user_script[start:end]
try:
host.execute_script(user_script)
except:
raise(e)
print("%s\n%s" % (host.debug_file_directory, host._dir), flush=True)
for line in sys.stdin:
line = line.rstrip()
logging.debug("Processing %s"%line)
host.new_objfile(line)
print("%s\n%s" % (host.debug_file_directory, host._dir), flush=True)
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