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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
import gdb.printing
# This is deprecated in 3.9, but required in older versions.
from typing import Optional
from .frames import select_frame
from .server import capability, request, client_bool_capability
from .startup import send_gdb_with_response, in_gdb_thread
from .varref import find_variable, VariableReference
class EvaluateResult(VariableReference):
def __init__(self, value):
super().__init__(None, value, "result")
# Helper function to evaluate an expression in a certain frame.
@in_gdb_thread
def _evaluate(expr, frame_id):
global_context = True
if frame_id is not None:
select_frame(frame_id)
global_context = False
val = gdb.parse_and_eval(expr, global_context=global_context)
ref = EvaluateResult(val)
return ref.to_object()
# Like _evaluate but ensure that the expression cannot cause side
# effects.
@in_gdb_thread
def _eval_for_hover(expr, frame_id):
with gdb.with_parameter("may-write-registers", "off"):
with gdb.with_parameter("may-write-memory", "off"):
with gdb.with_parameter("may-call-functions", "off"):
return _evaluate(expr, frame_id)
class _SetResult(VariableReference):
def __init__(self, value):
super().__init__(None, value, "value")
def to_object(self):
result = super().to_object()
# This is not specified in the setExpression result.
if "memoryReference" in result:
del result["memoryReference"]
return result
# Helper function to perform an assignment.
@in_gdb_thread
def _set_expression(expression, value, frame_id):
global_context = True
if frame_id is not None:
select_frame(frame_id)
global_context = False
lhs = gdb.parse_and_eval(expression, global_context=global_context)
rhs = gdb.parse_and_eval(value, global_context=global_context)
lhs.assign(rhs)
return _SetResult(lhs).to_object()
# Helper function to evaluate a gdb command in a certain frame.
@in_gdb_thread
def _repl(command, frame_id):
if frame_id is not None:
select_frame(frame_id)
val = gdb.execute(command, from_tty=True, to_string=True)
return {
"result": val,
"variablesReference": 0,
}
@request("evaluate")
@capability("supportsEvaluateForHovers")
def eval_request(
*,
expression: str,
frameId: Optional[int] = None,
context: str = "variables",
**args,
):
if context in ("watch", "variables"):
# These seem to be expression-like.
return send_gdb_with_response(lambda: _evaluate(expression, frameId))
elif context == "hover":
return send_gdb_with_response(lambda: _eval_for_hover(expression, frameId))
elif context == "repl":
return send_gdb_with_response(lambda: _repl(expression, frameId))
else:
raise Exception('unknown evaluate context "' + context + '"')
@in_gdb_thread
def _variables(ref, start, count):
var = find_variable(ref)
children = var.fetch_children(start, count)
return [x.to_object() for x in children]
@request("variables")
# Note that we ignore the 'filter' field. That seems to be
# specific to javascript.
def variables(*, variablesReference: int, start: int = 0, count: int = 0, **args):
# This behavior was clarified here:
# https://github.com/microsoft/debug-adapter-protocol/pull/394
if not client_bool_capability("supportsVariablePaging"):
start = 0
count = 0
result = send_gdb_with_response(
lambda: _variables(variablesReference, start, count)
)
return {"variables": result}
@capability("supportsSetExpression")
@request("setExpression")
def set_expression(
*, expression: str, value: str, frameId: Optional[int] = None, **args
):
return send_gdb_with_response(lambda: _set_expression(expression, value, frameId))
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