linux-kernel - Re: [PATCH v2 5/7] tools/perf: fix Python string escapes

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Message-ID: <592b8fd2-bfe3-0f8d-2814-d8340bbc75ee@intel.com>
Date:   Wed, 13 Sep 2023 08:53:26 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Benjamin Gray <bgray@...ux.ibm.com>, linux-ia64@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        llvm@...ts.linux.dev, linux-pm@...r.kernel.org,
        bpf@...r.kernel.org, linux-kselftest@...r.kernel.org
Cc:     Jonathan Corbet <corbet@....net>, Ian Abbott <abbotti@....co.uk>,
        H Hartley Sweeten <hsweeten@...ionengravers.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, Jan Kiszka <jan.kiszka@...mens.com>,
        Kieran Bingham <kbingham@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        linux-perf-users@...r.kernel.org,
        Todd E Brandt <todd.e.brandt@...ux.intel.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH v2 5/7] tools/perf: fix Python string escapes

On 13/09/23 03:26, Benjamin Gray wrote:
> On 12/9/23 8:56 pm, Adrian Hunter wrote:
>> On 12/09/23 09:07, Benjamin Gray wrote:
>>> diff --git a/tools/perf/pmu-events/jevents.py b/tools/perf/pmu-events/jevents.py
>>> index a7e88332276d..980f080a5a2c 100755
>>> --- a/tools/perf/pmu-events/jevents.py
>>> +++ b/tools/perf/pmu-events/jevents.py
>>> @@ -83,7 +83,7 @@ def c_len(s: str) -> int:
>>>     """Return the length of s a C string
>>>       This doesn't handle all escape characters properly. It first assumes
>>> -  all \ are for escaping, it then adjusts as it will have over counted
>>> +  all \\ are for escaping, it then adjusts as it will have over counted
>>
>> It looks like the whole string should be a raw string
>>
> ...
>>> -                s = value.replace("%", "\%")
>>> -                s = s.replace("_", "\_")
>>> +                s = value.replace("%", "\\%")
>>> +                s = s.replace("_", "\\_")
>>
>> Raw strings seem more readable, so could be
>> used here too
> 
> Yeah, sounds good. I normally use r strings only for regex, but there shouldn't be any ambiguity here (it might have been misleading if the search argument to replace looked like a regex).
> 
> Having the docstring be an r string is a good catch. There's probably a few like that in the kernel, but finding them is a little more complicated because they might be 'valid' syntax (e.g., the '\000' just becomes a null byte. This series is focused on the syntax errors though, so I'll just leave it be.
> 
> How is the following?
> ---
> Subject: [PATCH] tools/perf: fix Python string escapes
> 
> Python 3.6 introduced a DeprecationWarning for invalid escape sequences.
> This is upgraded to a SyntaxWarning in Python 3.12, and will eventually
> be a syntax error.
> 
> Fix these now to get ahead of it before it's an error.
> 
> Signed-off-by: Benjamin Gray <bgray@...ux.ibm.com>

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
>  tools/perf/pmu-events/jevents.py                 | 2 +-
>  tools/perf/scripts/python/arm-cs-trace-disasm.py | 4 ++--
>  tools/perf/scripts/python/compaction-times.py    | 2 +-
>  tools/perf/scripts/python/exported-sql-viewer.py | 4 ++--
>  4 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/tools/perf/pmu-events/jevents.py b/tools/perf/pmu-events/jevents.py
> index a7e88332276d..1b4519333a28 100755
> --- a/tools/perf/pmu-events/jevents.py
> +++ b/tools/perf/pmu-events/jevents.py
> @@ -80,7 +80,7 @@ def file_name_to_table_name(prefix: str, parents: Sequence[str],
> 
> 
>  def c_len(s: str) -> int:
> -  """Return the length of s a C string
> +  r"""Return the length of s a C string
> 
>    This doesn't handle all escape characters properly. It first assumes
>    all \ are for escaping, it then adjusts as it will have over counted
> diff --git a/tools/perf/scripts/python/arm-cs-trace-disasm.py b/tools/perf/scripts/python/arm-cs-trace-disasm.py
> index d59ff53f1d94..de58991c78bb 100755
> --- a/tools/perf/scripts/python/arm-cs-trace-disasm.py
> +++ b/tools/perf/scripts/python/arm-cs-trace-disasm.py
> @@ -45,8 +45,8 @@ parser = OptionParser(option_list=option_list)
>  # Initialize global dicts and regular expression
>  disasm_cache = dict()
>  cpu_data = dict()
> -disasm_re = re.compile("^\s*([0-9a-fA-F]+):")
> -disasm_func_re = re.compile("^\s*([0-9a-fA-F]+)\s.*:")
> +disasm_re = re.compile(r"^\s*([0-9a-fA-F]+):")
> +disasm_func_re = re.compile(r"^\s*([0-9a-fA-F]+)\s.*:")
>  cache_size = 64*1024
> 
>  glb_source_file_name    = None
> diff --git a/tools/perf/scripts/python/compaction-times.py b/tools/perf/scripts/python/compaction-times.py
> index 2560a042dc6f..9401f7c14747 100644
> --- a/tools/perf/scripts/python/compaction-times.py
> +++ b/tools/perf/scripts/python/compaction-times.py
> @@ -260,7 +260,7 @@ def pr_help():
> 
>  comm_re = None
>  pid_re = None
> -pid_regex = "^(\d*)-(\d*)$|^(\d*)$"
> +pid_regex = r"^(\d*)-(\d*)$|^(\d*)$"
> 
>  opt_proc = popt.DISP_DFL
>  opt_disp = topt.DISP_ALL
> diff --git a/tools/perf/scripts/python/exported-sql-viewer.py b/tools/perf/scripts/python/exported-sql-viewer.py
> index 13f2d8a81610..78763531fe5a 100755
> --- a/tools/perf/scripts/python/exported-sql-viewer.py
> +++ b/tools/perf/scripts/python/exported-sql-viewer.py
> @@ -677,8 +677,8 @@ class CallGraphModelBase(TreeModel):
>              #   sqlite supports GLOB (text only) which uses * and ? and is case sensitive
>              if not self.glb.dbref.is_sqlite3:
>                  # Escape % and _
> -                s = value.replace("%", "\%")
> -                s = s.replace("_", "\_")
> +                s = value.replace("%", r"\%")
> +                s = s.replace("_", r"\_")
>                  # Translate * and ? into SQL LIKE pattern characters % and _
>                  trans = string.maketrans("*?", "%_")
>                  match = " LIKE '" + str(s).translate(trans) + "'"