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# Copyright 2022-2023 Free Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import gdb
from .frames import frame_for_id
from .startup import send_gdb_with_response, in_gdb_thread
from .server import request
from .varref import BaseReference
# Helper function to return a frame's block without error.
@in_gdb_thread
def _safe_block(frame):
try:
return frame.block()
except gdb.error:
return None
# Helper function to return two lists of variables of block, up to the
# enclosing function. The result is of the form (ARGS, LOCALS), where
# each element is itself a list.
@in_gdb_thread
def _block_vars(block):
args = []
locs = []
while True:
for var in block:
if var.is_argument:
args.append(var)
elif var.is_variable or var.is_constant:
locs.append(var)
if block.function is not None:
break
block = block.superblock
return (args, locs)
class ScopeReference(BaseReference):
def __init__(self, name, frame, var_list):
super().__init__(name)
self.frame = frame
self.func = frame.function()
self.var_list = var_list
def to_object(self):
result = super().to_object()
# How would we know?
result["expensive"] = False
result["namedVariables"] = len(self.var_list)
if self.func is not None:
result["line"] = self.func.line
# FIXME construct a Source object
return result
def child_count(self):
return len(self.var_list)
@in_gdb_thread
def fetch_one_child(self, idx):
sym = self.var_list[idx]
if sym.needs_frame:
val = sym.value(self.frame)
else:
val = sym.value()
return (sym.print_name, val)
# Helper function to create a DAP scopes for a given frame ID.
@in_gdb_thread
def _get_scope(id):
frame = frame_for_id(id)
block = _safe_block(frame)
scopes = []
if block is not None:
(args, locs) = _block_vars(block)
if args:
scopes.append(ScopeReference("Arguments", frame, args))
if locs:
scopes.append(ScopeReference("Locals", frame, locs))
return [x.to_object() for x in scopes]
@request("scopes")
def scopes(*, frameId, **extra):
scopes = send_gdb_with_response(lambda: _get_scope(frameId))
return {"scopes": scopes}
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