436 lines
18 KiB
Python
Executable File
436 lines
18 KiB
Python
Executable File
#!/usr/bin/env python3
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"""Drives the C++ and Rust debug builds under gdb, and the Python build
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under debugpy, to their equivalent breakpoint (right after the 30/20/10
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list is built), evaluates the JSON-producing debug-graph helper exactly as
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VS Code's "Debug Visualizer" extension would (via -data-evaluate-expression
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for gdb, an `evaluate` DAP request for debugpy), and replays the
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extension's own parseEvaluationResultFromGenericDebugAdapter algorithm on
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the raw result -- so we can tell, without going through the VS Code UI,
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whether our JSON will actually be recognized or whether the extension will
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fall back to its generic byte-walk visualization.
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The parsing port below mirrors:
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external/vscode-debug-visualizer/extension/src/VisualizationBackend/
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parseEvaluationResultFromGenericDebugAdapter.ts
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Keep it in sync if that file changes upstream.
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Writes debug_cpp.json / debug_rust.json / debug_python.json into the
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output directory (default ~/lg, matching the style of the extension's own
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captured dumps): either the resolved data object on success, or a
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{"PARSE_ERROR": ..., "raw": ...} diagnostic on failure.
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For the C++ build specifically, the breakpoint sits inside
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`if (const int* top = list.peek_front())`, so `top` is a live local pointing
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at the head node's `data` field (the node's first member, so its address
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equals the node's own address, but its *static type* is just `const int*` --
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gdb has no way to know it's secretly interior to a `Node<int>`). VS Code's
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"debugVisualizer.debugAdapterConfigurations" expressionTemplate wraps
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whatever you type in the Watch box as $debug_graph(${expr}), so typing
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plain `top` evaluates $debug_graph(top) -- not $debug_graph(list, ...): we
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replay that exact call and verify it still delves into the full list. This
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relies on gdb/debug_graph.py's auto-discovery of sibling locals (here,
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`list`, a struct type it *can* walk) merging into the same node graph as
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`top`'s address, rather than requiring `top` to be passed as an explicit
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watched root.
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The Python build has no pointers -- `top` there is just a plain int, not a
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value interior to any struct -- but python/debug_graph.py's own
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auto-discovery of sibling locals (here `lst`) means evaluating
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debug_graph(top) still delves into the whole list for the same underlying
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reason: verify_top_delves_into_list_py exercises that.
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"""
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import ast
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import json
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import os
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import re
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import shutil
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import socket
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import subprocess
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import sys
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import time
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from pathlib import Path
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REPO = Path(__file__).resolve().parent.parent
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def run_gdb(gdb_bin, binary, break_file, break_line, expr="$debug_graph(list)"):
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commands = [
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"-gdb-set print elements 0",
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"-gdb-set print characters 0",
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"source %s" % (REPO / "gdb" / "debug_graph.py"),
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"-break-insert %s:%d" % (break_file, break_line),
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"-exec-run",
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'-data-evaluate-expression "%s"' % expr.replace('"', '\\"'),
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]
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proc = subprocess.run(
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[gdb_bin, "--interpreter=mi", binary],
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input="\n".join(commands).encode(),
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT,
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timeout=15,
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cwd=str(REPO),
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)
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out = proc.stdout.decode(errors="replace")
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matches = re.findall(r'\^done,value="(.*)"\s*$', out, re.M)
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errors = re.findall(r'\^error,msg="(.*)"\s*$', out, re.M)
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if not matches:
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raise RuntimeError("no ^done,value=... in gdb output; errors=%r\n---\n%s" % (errors, out))
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return matches[-1]
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def is_enclosed_with(s, ch):
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return s.startswith(ch) and s.endswith(ch) and len(s) >= 2
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def parse_like_extension(mi_escaped_value):
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"""Port of parseEvaluationResultFromGenericDebugAdapter, applied to the
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raw MI `value="..."` payload (itself one layer of MI's own
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string-escaping around whatever gdb's evaluate actually reported)."""
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result_text = json.loads('"' + mi_escaped_value + '"') # undo MI's escaping
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json_data = result_text.strip()
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try:
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try:
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if is_enclosed_with(json_data, '"') or is_enclosed_with(json_data, "'"):
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json_data2 = json_data[1:-1]
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else:
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json_data2 = json_data
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result_obj = json.loads(json_data2)
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except Exception:
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# "in case of C++": the whole thing is itself a JSON string
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# literal; unwrap it once, then parse *that* as JSON.
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s = json.loads(json_data)
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result_obj = json.loads(s)
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return {"ok": True, "data": result_obj}
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except Exception as e:
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return {"ok": False, "error": str(e), "raw": result_text}
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def find_debugpy_python():
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"""Locates a Python interpreter with `debugpy` importable: the debugpy
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analog of picking `gdb`/`rust-gdb` off the PATH above. Checked in order:
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an explicit override, the interpreter running this script, then a
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couple of common places a dev might have installed it, since debugpy
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isn't always on the system Python (this repo's system python3 is on a
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version too new for the Debian-packaged debugpy, so it typically lives
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in a venv)."""
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candidates = []
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override = os.environ.get("DUMP_DEBUG_GRAPH_PYTHON")
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if override:
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candidates.append(override)
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candidates.append(sys.executable)
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candidates.append(str(Path.home() / "py314" / "bin" / "python3"))
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which = shutil.which("python3")
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if which:
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candidates.append(which)
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for candidate in candidates:
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if not candidate:
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continue
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try:
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subprocess.run(
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[candidate, "-c", "import debugpy"],
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check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL, timeout=10,
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)
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except Exception:
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continue
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return candidate
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raise RuntimeError(
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"no python interpreter with debugpy found; set DUMP_DEBUG_GRAPH_PYTHON=/path/to/python"
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)
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class _DapClient:
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"""Minimal Debug Adapter Protocol client: just enough of the wire
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protocol (Content-Length-framed JSON over a TCP socket) to drive
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debugpy the same way -interpreter=mi drives gdb above -- no IDE, no
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`debugpy` package needed on this side, since debugpy itself only needs
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to be importable by the *debuggee* interpreter."""
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def __init__(self, sock):
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self._sock = sock
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self._buf = b""
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self._seq = 0
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def send(self, command, arguments=None):
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self._seq += 1
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msg = {"seq": self._seq, "type": "request", "command": command}
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if arguments is not None:
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msg["arguments"] = arguments
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body = json.dumps(msg).encode("utf-8")
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self._sock.sendall(("Content-Length: %d\r\n\r\n" % len(body)).encode("ascii") + body)
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return self._seq
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def _read_message(self):
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while b"\r\n\r\n" not in self._buf:
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chunk = self._sock.recv(4096)
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if not chunk:
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raise EOFError("debugpy closed the connection")
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self._buf += chunk
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header, _, rest = self._buf.partition(b"\r\n\r\n")
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length = int(header.split(b":")[1].strip())
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while len(rest) < length:
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chunk = self._sock.recv(4096)
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if not chunk:
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raise EOFError("debugpy closed the connection")
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rest += chunk
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body, self._buf = rest[:length], rest[length:]
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return json.loads(body.decode("utf-8"))
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def wait_for(self, predicate, timeout=15):
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deadline = time.time() + timeout
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while time.time() < deadline:
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msg = self._read_message()
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if predicate(msg):
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return msg
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raise TimeoutError("timed out waiting for a matching DAP message")
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def run_debugpy(python_bin, script_path, break_line, expr):
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"""Launches `script_path` under debugpy (paused via --wait-for-client),
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connects a plain DAP client, sets one breakpoint, waits for it to hit,
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and evaluates `expr` in that frame -- the debugpy equivalent of
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run_gdb()'s -data-evaluate-expression. `context: "watch"` mirrors what
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VS Code sends for a Watch-panel entry (rather than "repl"), matching
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how the Debug Visualizer extension's expressionTemplate is actually
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invoked. Returns the raw `result` string from the evaluate response
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(debugpy's repr() of whatever the expression returned)."""
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with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as probe:
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probe.bind(("127.0.0.1", 0))
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port = probe.getsockname()[1]
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proc = subprocess.Popen(
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[python_bin, "-m", "debugpy", "--listen", "127.0.0.1:%d" % port, "--wait-for-client", str(script_path)],
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cwd=str(Path(script_path).parent),
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stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL,
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)
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try:
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sock = None
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for _ in range(50):
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try:
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sock = socket.create_connection(("127.0.0.1", port), timeout=1)
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break
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except OSError:
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time.sleep(0.2)
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if sock is None:
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raise RuntimeError("debugpy never opened its listen socket")
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with sock:
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client = _DapClient(sock)
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client.send("initialize", {
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"clientID": "dump-debug-graph", "adapterID": "debugpy", "pathFormat": "path",
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"linesStartAt1": True, "columnsStartAt1": True,
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})
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client.wait_for(lambda m: m.get("type") == "response" and m.get("command") == "initialize")
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client.send("attach", {"justMyCode": False})
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client.wait_for(lambda m: m.get("type") == "event" and m.get("event") == "initialized")
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client.send("setBreakpoints", {
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"source": {"path": str(script_path)},
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"breakpoints": [{"line": break_line}],
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})
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client.wait_for(lambda m: m.get("type") == "response" and m.get("command") == "setBreakpoints")
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client.send("configurationDone")
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client.wait_for(lambda m: m.get("type") == "response" and m.get("command") == "configurationDone")
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client.wait_for(lambda m: m.get("type") == "response" and m.get("command") == "attach")
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stopped = client.wait_for(lambda m: m.get("type") == "event" and m.get("event") == "stopped")
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thread_id = stopped["body"]["threadId"]
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st_seq = client.send("stackTrace", {"threadId": thread_id})
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frames = client.wait_for(lambda m: m.get("type") == "response" and m.get("request_seq") == st_seq)
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frame_id = frames["body"]["stackFrames"][0]["id"]
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ev_seq = client.send("evaluate", {"expression": expr, "frameId": frame_id, "context": "watch"})
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evaluated = client.wait_for(lambda m: m.get("type") == "response" and m.get("request_seq") == ev_seq)
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if not evaluated.get("success"):
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raise RuntimeError("evaluate failed: %r" % (evaluated.get("message"),))
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result = evaluated["body"]["result"]
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client.send("continue", {"threadId": thread_id})
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return result
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finally:
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try:
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proc.wait(timeout=10)
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except subprocess.TimeoutExpired:
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proc.kill()
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proc.wait(timeout=10)
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def parse_python_result(raw_result):
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"""debugpy's evaluate response reports a string return value as
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Python's own repr() of it (e.g. `'{"kind": ...}'`), not raw text --
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ast.literal_eval() is the exact inverse of that repr(), so it recovers
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our debug_graph()-produced JSON string before the normal json.loads()."""
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try:
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json_text = ast.literal_eval(raw_result)
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result_obj = json.loads(json_text)
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return {"ok": True, "data": result_obj}
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except Exception as e:
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return {"ok": False, "error": str(e), "raw": raw_result}
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def verify_top_delves_into_list_py(data):
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"""Python analog of verify_top_delves_into_list: checks that evaluating
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bare `top` (a plain int with no reference graph of its own) still shows
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the whole 30/20/10 list because `lst`, a sibling local at the same
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breakpoint, gets auto-discovered and walked too."""
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nodes = data.get("nodes", [])
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edges = data.get("edges", [])
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roots_by_name = {r.get("name"): r for r in data.get("roots", [])}
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node_shaped = [
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n for n in nodes
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if [f.get("name") for f in n.get("fields", [])] == ["data", "next"]
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]
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if not node_shaped:
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print(" VERIFY FAIL: debug_graph(top) produced no data+next Node-shaped node -- "
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"nodes=%r" % [n.get("id") for n in nodes])
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return False
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next_edges = [e for e in edges if e.get("label") == "next"]
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if len(next_edges) < 2:
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print(" VERIFY FAIL: expected 2 'next' edges chaining the 30/20/10 nodes, found %d "
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"(edges=%r)" % (len(next_edges), edges))
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return False
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if "lst" not in roots_by_name:
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print(" VERIFY FAIL: 'lst' was not auto-discovered as a sibling local alongside "
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"top (roots=%r)" % data.get("roots"))
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return False
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print(" VERIFY OK: debug_graph(top) delves into the full list -- %d nodes, %d 'next' "
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"edges, 'lst' auto-discovered as a %r root"
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% (len(nodes), len(next_edges), roots_by_name["lst"].get("kind")))
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return True
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def verify_top_delves_into_list(data):
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"""Checks that evaluating bare `top` -- i.e. $debug_graph(top), exactly
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what VS Code's expressionTemplate produces for a Watch box containing
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just "top" -- still shows the whole 30/20/10 list rather than stopping
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at a lone scalar leaf. Returns True/False and prints why."""
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nodes = data.get("nodes", [])
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edges = data.get("edges", [])
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roots_by_name = {r.get("name"): r for r in data.get("roots", [])}
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# Other auto-discovered locals (e.g. a `char*` local) can legitimately
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# produce their own bare scalar-leaf nodes -- only care whether *some*
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# node looks like a real Node<int> (data+next), i.e. top's address got
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# upgraded into the full struct rather than stopping at a lone int.
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node_shaped = [
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n for n in nodes
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if [f.get("name") for f in n.get("fields", [])] == ["data", "next"]
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]
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if not node_shaped:
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print(" VERIFY FAIL: $debug_graph(top) produced no data+next Node-shaped node -- "
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"top's address was never upgraded to the full Node it coincides with "
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"(nodes=%r)" % [n.get("id") for n in nodes])
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return False
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next_edges = [e for e in edges if e.get("label") == "next"]
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if len(next_edges) < 2:
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print(" VERIFY FAIL: expected 2 'next' edges chaining the 30/20/10 nodes, found %d "
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"(edges=%r)" % (len(next_edges), edges))
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return False
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if "list" not in roots_by_name:
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print(" VERIFY FAIL: 'list' was not auto-discovered as a sibling local alongside "
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"top (roots=%r)" % data.get("roots"))
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return False
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print(" VERIFY OK: $debug_graph(top) delves into the full list -- %d nodes, %d 'next' "
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"edges, 'list' auto-discovered as a %r root"
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% (len(nodes), len(next_edges), roots_by_name["list"].get("kind")))
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return True
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def _write_dump(label, out_dir, result):
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out_path = out_dir / ("debug_%s.json" % label)
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out_path.write_text(json.dumps(result, indent=4))
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print("Wrote %s (%s)" % (out_path, "OK" if "PARSE_ERROR" not in result else "PARSE_ERROR"))
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def dump(label, gdb_bin, binary, break_file, break_line, out_dir, expr="$debug_graph(list)", verify=None):
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ok = True
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try:
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raw_value = run_gdb(gdb_bin, binary, break_file, break_line, expr)
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except Exception as e:
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result = {"PARSE_ERROR": "gdb invocation failed", "detail": str(e)}
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ok = False
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else:
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parsed = parse_like_extension(raw_value)
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if parsed["ok"]:
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result = parsed["data"]
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if verify is not None:
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ok = verify(result)
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else:
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result = {
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"PARSE_ERROR": parsed["error"],
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"raw": parsed["raw"],
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"note": "This is what the Debug Visualizer extension would fail to parse, "
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"triggering its generic byte-walk fallback (constructGraphFromVariablesReference).",
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}
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ok = False
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_write_dump(label, out_dir, result)
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return ok
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def dump_python(label, python_bin, script_path, break_line, out_dir,
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expr="__import__('debug_graph').debug_graph(lst)", verify=None):
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ok = True
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try:
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raw_result = run_debugpy(python_bin, script_path, break_line, expr)
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except Exception as e:
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result = {"PARSE_ERROR": "debugpy invocation failed", "detail": str(e)}
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ok = False
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else:
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parsed = parse_python_result(raw_result)
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if parsed["ok"]:
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result = parsed["data"]
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if verify is not None:
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ok = verify(result)
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else:
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result = {
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"PARSE_ERROR": parsed["error"],
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"raw": parsed["raw"],
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"note": "This is what the Debug Visualizer extension would fail to parse, "
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"triggering its generic byte-walk fallback (constructGraphFromVariablesReference).",
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}
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ok = False
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_write_dump(label, out_dir, result)
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return ok
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def main():
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out_dir = Path(sys.argv[1]) if len(sys.argv) > 1 else Path.home() / "lg"
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out_dir.mkdir(parents=True, exist_ok=True)
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ok_cpp = dump("cpp", "gdb", str(REPO / "cpp" / "list_example_cpp"), "cpp/main.cpp", 70, out_dir)
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ok_cpp_top = dump(
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"cpp_top", "gdb", str(REPO / "cpp" / "list_example_cpp"), "cpp/main.cpp", 70, out_dir,
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expr="$debug_graph(top)",
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verify=verify_top_delves_into_list,
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)
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ok_rust = dump("rust", "rust-gdb", str(REPO / "target" / "debug" / "list_example"), "src/main.rs", 51, out_dir)
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python_bin = find_debugpy_python()
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python_script = REPO / "python" / "main.py"
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ok_python = dump_python("python", python_bin, python_script, 54, out_dir)
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ok_python_top = dump_python(
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"python_top", python_bin, python_script, 54, out_dir,
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expr="__import__('debug_graph').debug_graph(top)",
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verify=verify_top_delves_into_list_py,
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)
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if not (ok_cpp and ok_cpp_top and ok_rust and ok_python and ok_python_top):
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sys.exit(1)
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if __name__ == "__main__":
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main()
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