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X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Fam Zheng , Paolo Bonzini , Jason Wang , Stefan Hajnoczi , qemu-block@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 9/13/19 5:00 PM, Philippe Mathieu-Daud=C3=A9 wrote: > On 9/13/19 10:01 PM, John Snow wrote: >> On 9/13/19 6:52 AM, Philippe Mathieu-Daud=C3=A9 wrote: >>> Event format ending with newlines confuse the trace reports. >>> Forbid them. >>> >>> Add a check to refuse new format added with trailing newline: >>> >>> $ make >>> [...] >>> GEN hw/misc/trace.h >>> Traceback (most recent call last): >>> File "scripts/tracetool.py", line 152, in >>> main(sys.argv) >>> File "scripts/tracetool.py", line 143, in main >>> events.extend(tracetool.read_events(fh, arg)) >>> File "scripts/tracetool/__init__.py", line 367, in read_events >>> event =3D Event.build(line) >>> File "scripts/tracetool/__init__.py", line 281, in build >>> raise ValueError("Event format can not end with a newline chara= cter") >>> ValueError: Error at hw/misc/trace-events:121: Event format can not= end with a newline character >>> >>> Signed-off-by: Philippe Mathieu-Daud=C3=A9 >>> --- >>> docs/devel/tracing.txt | 2 ++ >>> scripts/tracetool/__init__.py | 3 +++ >>> 2 files changed, 5 insertions(+) >>> >>> diff --git a/docs/devel/tracing.txt b/docs/devel/tracing.txt >>> index 76e492a489..8231bbf5d1 100644 >>> --- a/docs/devel/tracing.txt >>> +++ b/docs/devel/tracing.txt >>> @@ -112,6 +112,8 @@ Trace events should use types as follows: >>> Format strings should reflect the types defined in the trace event. = Take >>> special care to use PRId64 and PRIu64 for int64_t and uint64_t types= , >>> respectively. This ensures portability between 32- and 64-bit platf= orms. >>> +Format strings must not end with a newline character. It is the res= ponsibility >>> +of backends to adapt line ending for proper logging. >>> =20 >>> Each event declaration will start with the event name, then its argu= ments, >>> finally a format string for pretty-printing. For example: >>> diff --git a/scripts/tracetool/__init__.py b/scripts/tracetool/__init= __.py >>> index 6fca674936..57df74e67c 100644 >>> --- a/scripts/tracetool/__init__.py >>> +++ b/scripts/tracetool/__init__.py >>> @@ -277,6 +277,9 @@ class Event(object): >>> if fmt.find("%m") !=3D -1 or fmt_trans.find("%m") !=3D -1: >>> raise ValueError("Event format '%m' is forbidden, pass t= he error " >>> "as an explicit trace argument") >>> + if fmt.endswith("\\n\""): >>> + raise ValueError("Event format must not end with a newli= ne " >> >> It's barely worth mentioning, but you can use r"\n" for cases like thi= s, >> if it makes it easier to read. >=20 > TIL Python r"" :) >=20 > This would be r"\n\"", right? We need to match the trailing '"'. > Same length, not sure which string is easier to review =3D) >=20 Ah, wow, I did misread this. It's confusing! In this case, you can use r'\n"' to get the job done. (My r-b stands, anyway.) --js