lldb/bindings/python/lldb-python

#!/usr/bin/env python3

import subprocess
import os
import sys
import json

lldb = os.path.join(os.path.dirname(__file__), 'lldb')

info_json = subprocess.run([lldb, "-l", "python", "-print-script-interpreter-info"],
    check=True, stdout=subprocess.PIPE, encoding='utf8').stdout
info = json.loads(info_json)

os.environ["PYTHONPATH"] = (
    info["lldb-pythonpath"] + os.path.pathsep + os.environ.get("PYTHONPATH", ""))

os.execl(info["executable"], info["executable"], *sys.argv[1:])
[lldb] make it easier to find LLDB's python It is surprisingly difficult to write a simple python script that can reliably `import lldb` without failing, or crashing. I'm currently resorting to convolutions like this: def find_lldb(may_reexec=False): if prefix := os.environ.get('LLDB_PYTHON_PREFIX'): if os.path.realpath(prefix) != os.path.realpath(sys.prefix): raise Exception("cannot import lldb.\n" f" sys.prefix should be: {prefix}\n" f" but it is: {sys.prefix}") else: line1, line2 = subprocess.run( ['lldb', '-x', '-b', '-o', 'script print(sys.prefix)'], encoding='utf8', stdout=subprocess.PIPE, check=True).stdout.strip().splitlines() assert line1.strip() == '(lldb) script print(sys.prefix)' prefix = line2.strip() os.environ['LLDB_PYTHON_PREFIX'] = prefix if sys.prefix != prefix: if not may_reexec: raise Exception( "cannot import lldb.\n" + f" This python, at {sys.prefix}\n" f" does not math LLDB's python at {prefix}") os.environ['LLDB_PYTHON_PREFIX'] = prefix python_exe = os.path.join(prefix, 'bin', 'python3') os.execl(python_exe, python_exe, sys.argv) lldb_path = subprocess.run(['lldb', '-P'], check=True, stdout=subprocess.PIPE, encoding='utf8').stdout.strip() sys.path = [lldb_path] + sys.path This patch aims to replace all that with: #!/usr/bin/env lldb-python import lldb ... ... by adding the following features: new command line option: --print-script-interpreter-info. This prints language-specific information about the script interpreter in JSON format. * new tool (unix only): lldb-python which finds python and exec's it. Reviewed By: JDevlieghere Differential Revision: https://reviews.llvm.org/D112973 2021-11-10 10:33:33 -08:00			`#!/usr/bin/env python3`

			`import subprocess`
			`import os`
			`import sys`
			`import json`

			`lldb = os.path.join(os.path.dirname(__file__), 'lldb')`

			`info_json = subprocess.run([lldb, "-l", "python", "-print-script-interpreter-info"],`
			`check=True, stdout=subprocess.PIPE, encoding='utf8').stdout`
			`info = json.loads(info_json)`

			`os.environ["PYTHONPATH"] = (`
			`info["lldb-pythonpath"] + os.path.pathsep + os.environ.get("PYTHONPATH", ""))`

			`os.execl(info["executable"], info["executable"], *sys.argv[1:])`