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#!/usr/bin/env python3
# vim:sw=4:ts=4:et:
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
# This script uses `fix-stacks` to post-process the entries produced by
# MozFormatCodeAddress().
import atexit
import os
import platform
import re
import sys
from subprocess import PIPE, Popen
# Matches lines produced by MozFormatCodeAddress(), e.g.
# `#01: ???[tests/example +0x43a0]`.
line_re = re.compile(r"#\d+: .+\[.+ \+0x[0-9A-Fa-f]+\]")
fix_stacks = None
def autobootstrap():
import buildconfig
from mozbuild.configure import ConfigureSandbox
sandbox = ConfigureSandbox(
{},
argv=[
"configure",
"--help",
"--host={}".format(buildconfig.substs["HOST_ALIAS"]),
],
)
moz_configure = os.path.join(buildconfig.topsrcdir, "build", "moz.configure")
sandbox.include_file(os.path.join(moz_configure, "init.configure"))
sandbox.include_file(os.path.join(moz_configure, "bootstrap.configure"))
# Expand the `bootstrap_path` template for "fix-stacks", and execute the
# expanded function via `_value_for`, which will trigger autobootstrap.
sandbox._value_for(sandbox["bootstrap_path"]("fix-stacks"))
def initFixStacks(jsonMode, slowWarning, breakpadSymsDir, hide_errors):
# Look in MOZ_FETCHES_DIR (for automation), then in MOZBUILD_STATE_PATH
# (for a local build where the user has that set), then in ~/.mozbuild
# (for a local build with default settings).
base = os.environ.get(
"MOZ_FETCHES_DIR",
os.environ.get("MOZBUILD_STATE_PATH", os.path.expanduser("~/.mozbuild")),
)
fix_stacks_exe = base + "/fix-stacks/fix-stacks"
if platform.system() == "Windows":
fix_stacks_exe = fix_stacks_exe + ".exe"
if not (os.path.isfile(fix_stacks_exe) and os.access(fix_stacks_exe, os.X_OK)):
try:
autobootstrap()
except ImportError:
# We're out-of-tree (e.g. tests tasks on CI) and can't autobootstrap
# (we shouldn't anyways).
pass
if not (os.path.isfile(fix_stacks_exe) and os.access(fix_stacks_exe, os.X_OK)):
raise Exception("cannot find `fix-stacks`; please run `./mach bootstrap`")
args = [fix_stacks_exe]
if jsonMode:
args.append("-j")
if breakpadSymsDir:
args.append("-b")
args.append(breakpadSymsDir)
# Sometimes we need to prevent errors from going to stderr.
stderr = open(os.devnull) if hide_errors else None
global fix_stacks
fix_stacks = Popen(
args, stdin=PIPE, stdout=PIPE, stderr=stderr, universal_newlines=True
)
# Shut down the fix_stacks process on exit. We use `terminate()`
# because it is more forceful than `wait()`, and the Python docs warn
# about possible deadlocks with `wait()`.
def cleanup(fix_stacks):
for fn in [fix_stacks.stdin.close, fix_stacks.terminate]:
try:
fn()
except OSError:
pass
atexit.register(cleanup, fix_stacks)
if slowWarning:
print(
"Initializing stack-fixing for the first stack frame, this may take a while..."
)
def fixSymbols(
line, jsonMode=False, slowWarning=False, breakpadSymsDir=None, hide_errors=False
):
is_bytes = isinstance(line, bytes)
line_str = line.decode("utf-8") if is_bytes else line
if line_re.search(line_str) is None:
return line
if not fix_stacks:
initFixStacks(jsonMode, slowWarning, breakpadSymsDir, hide_errors)
# Sometimes `line` is lacking a trailing newline. If we pass such a `line`
# to `fix-stacks` it will wait until it receives a newline, causing this
# script to hang. So we add a newline if one is missing and then remove it
# from the output.
is_missing_newline = not line_str.endswith("\n")
if is_missing_newline:
line_str = line_str + "\n"
fix_stacks.stdin.write(line_str)
fix_stacks.stdin.flush()
out = fix_stacks.stdout.readline()
if is_missing_newline:
out = out[:-1]
if is_bytes and not isinstance(out, bytes):
out = out.encode("utf-8")
return out
if __name__ == "__main__":
bpsyms = os.environ.get("BREAKPAD_SYMBOLS_PATH", None)
for line in sys.stdin:
sys.stdout.write(fixSymbols(line, breakpadSymsDir=bpsyms))
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