| Message ID | 20200717093517.73397-2-r.bolshakov@yadro.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add dtrace support on macOS | expand |
On 7/17/20 11:35 AM, Roman Bolshakov wrote: > dtrace USDT is fully supported since OS X 10.6. There are a few > peculiarities compared to other dtrace flavors. > > 1. It doesn't accept empty files. > 2. It doesn't recognize bool type but accepts C99 _Bool. > 3. It converts int8_t * in probe points to char * in > header files and introduces [-Wpointer-sign] warning. > > Cc: Cameron Esfahani <dirty@apple.com> > Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com> > --- > scripts/tracetool/format/d.py | 15 ++++++++++++++- > 1 file changed, 14 insertions(+), 1 deletion(-) > > diff --git a/scripts/tracetool/format/d.py b/scripts/tracetool/format/d.py > index 0afb5f3f47..353722f89c 100644 > --- a/scripts/tracetool/format/d.py > +++ b/scripts/tracetool/format/d.py > @@ -13,6 +13,7 @@ __email__ = "stefanha@redhat.com" > > > from tracetool import out > +from sys import platform > > > # Reserved keywords from > @@ -34,7 +35,8 @@ def generate(events, backend, group): > > # SystemTap's dtrace(1) warns about empty "provider qemu {}" but is happy > # with an empty file. Avoid the warning. > - if not events: > + # But dtrace on macOS can't deal with empty files. > + if not events and platform != "darwin": or? > return > > out('/* This file is autogenerated by tracetool, do not edit. */' > @@ -44,6 +46,17 @@ def generate(events, backend, group): > for e in events: > args = [] > for type_, name in e.args: > + if platform == "darwin": > + # macOS dtrace accepts only C99 _Bool Why not do that for all platforms? > + if type_ == 'bool': > + type_ = '_Bool' > + if type_ == 'bool *': > + type_ = '_Bool *' > + # It converts int8_t * in probe points to char * in header > + # files and introduces [-Wpointer-sign] warning. > + # Avoid it by changing probe type to signed char * beforehand. > + if type_ == 'int8_t *': > + type_ = 'signed char *' > if name in RESERVED_WORDS: > name += '_' > args.append(type_ + ' ' + name) >
On Sun, Jul 19, 2020 at 03:52:08PM +0200, Philippe Mathieu-Daudé wrote: > On 7/17/20 11:35 AM, Roman Bolshakov wrote: > > dtrace USDT is fully supported since OS X 10.6. There are a few > > peculiarities compared to other dtrace flavors. > > > > 1. It doesn't accept empty files. > > 2. It doesn't recognize bool type but accepts C99 _Bool. > > 3. It converts int8_t * in probe points to char * in > > header files and introduces [-Wpointer-sign] warning. > > > > Cc: Cameron Esfahani <dirty@apple.com> > > Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com> > > --- > > scripts/tracetool/format/d.py | 15 ++++++++++++++- > > 1 file changed, 14 insertions(+), 1 deletion(-) > > > > diff --git a/scripts/tracetool/format/d.py b/scripts/tracetool/format/d.py > > index 0afb5f3f47..353722f89c 100644 > > --- a/scripts/tracetool/format/d.py > > +++ b/scripts/tracetool/format/d.py > > @@ -13,6 +13,7 @@ __email__ = "stefanha@redhat.com" > > > > > > from tracetool import out > > +from sys import platform > > > > > > # Reserved keywords from > > @@ -34,7 +35,8 @@ def generate(events, backend, group): > > > > # SystemTap's dtrace(1) warns about empty "provider qemu {}" but is happy > > # with an empty file. Avoid the warning. > > - if not events: > > + # But dtrace on macOS can't deal with empty files. > > + if not events and platform != "darwin": > > or? no, the event list is empty for some files where all events are disabled (e.g. hppa/trace-events), so it should have an "and" here. This limits early exit only on macOS. The precendence looks correct: https://docs.python.org/3/reference/expressions.html#operator-precedence > > > return > > > > out('/* This file is autogenerated by tracetool, do not edit. */' > > @@ -44,6 +46,17 @@ def generate(events, backend, group): > > for e in events: > > args = [] > > for type_, name in e.args: > > + if platform == "darwin": > > + # macOS dtrace accepts only C99 _Bool > > Why not do that for all platforms? > Because I can only test the changes on darwin :) I don't know how other dtrace flavors behave and whether it is an issue for dtrace on Linux/Solaris/FreeBSD/etc. Thanks, Roman > > + if type_ == 'bool': > > + type_ = '_Bool' > > + if type_ == 'bool *': > > + type_ = '_Bool *' > > + # It converts int8_t * in probe points to char * in header > > + # files and introduces [-Wpointer-sign] warning. > > + # Avoid it by changing probe type to signed char * beforehand. > > + if type_ == 'int8_t *': > > + type_ = 'signed char *' > > if name in RESERVED_WORDS: > > name += '_' > > args.append(type_ + ' ' + name) > > >
On 7/20/20 12:50 PM, Roman Bolshakov wrote: > On Sun, Jul 19, 2020 at 03:52:08PM +0200, Philippe Mathieu-Daudé wrote: >> On 7/17/20 11:35 AM, Roman Bolshakov wrote: >>> dtrace USDT is fully supported since OS X 10.6. There are a few >>> peculiarities compared to other dtrace flavors. >>> >>> 1. It doesn't accept empty files. >>> 2. It doesn't recognize bool type but accepts C99 _Bool. >>> 3. It converts int8_t * in probe points to char * in >>> header files and introduces [-Wpointer-sign] warning. >>> >>> Cc: Cameron Esfahani <dirty@apple.com> >>> Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com> >>> --- >>> scripts/tracetool/format/d.py | 15 ++++++++++++++- >>> 1 file changed, 14 insertions(+), 1 deletion(-) >>> >>> diff --git a/scripts/tracetool/format/d.py b/scripts/tracetool/format/d.py >>> index 0afb5f3f47..353722f89c 100644 >>> --- a/scripts/tracetool/format/d.py >>> +++ b/scripts/tracetool/format/d.py >>> @@ -13,6 +13,7 @@ __email__ = "stefanha@redhat.com" >>> >>> >>> from tracetool import out >>> +from sys import platform >>> >>> >>> # Reserved keywords from >>> @@ -34,7 +35,8 @@ def generate(events, backend, group): >>> >>> # SystemTap's dtrace(1) warns about empty "provider qemu {}" but is happy >>> # with an empty file. Avoid the warning. >>> - if not events: >>> + # But dtrace on macOS can't deal with empty files. >>> + if not events and platform != "darwin": >> >> or? > > no, the event list is empty for some files where all events are > disabled (e.g. hppa/trace-events), so it should have an "and" here. This > limits early exit only on macOS. Ah yes you are right, I misread it. > The precendence looks correct: > > https://docs.python.org/3/reference/expressions.html#operator-precedence > >> >>> return >>> >>> out('/* This file is autogenerated by tracetool, do not edit. */' >>> @@ -44,6 +46,17 @@ def generate(events, backend, group): >>> for e in events: >>> args = [] >>> for type_, name in e.args: >>> + if platform == "darwin": >>> + # macOS dtrace accepts only C99 _Bool >> >> Why not do that for all platforms? >> > > Because I can only test the changes on darwin :) > I don't know how other dtrace flavors behave and whether it is an issue > for dtrace on Linux/Solaris/FreeBSD/etc. > > Thanks, > Roman > >>> + if type_ == 'bool': >>> + type_ = '_Bool' >>> + if type_ == 'bool *': >>> + type_ = '_Bool *' >>> + # It converts int8_t * in probe points to char * in header >>> + # files and introduces [-Wpointer-sign] warning. >>> + # Avoid it by changing probe type to signed char * beforehand. >>> + if type_ == 'int8_t *': >>> + type_ = 'signed char *' >>> if name in RESERVED_WORDS: >>> name += '_' >>> args.append(type_ + ' ' + name) >>> >> >
On Fri, Jul 17, 2020 at 12:35:14PM +0300, Roman Bolshakov wrote: > dtrace USDT is fully supported since OS X 10.6. There are a few > peculiarities compared to other dtrace flavors. > > 1. It doesn't accept empty files. > 2. It doesn't recognize bool type but accepts C99 _Bool. > 3. It converts int8_t * in probe points to char * in > header files and introduces [-Wpointer-sign] warning. > > Cc: Cameron Esfahani <dirty@apple.com> > Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com> > --- > scripts/tracetool/format/d.py | 15 ++++++++++++++- > 1 file changed, 14 insertions(+), 1 deletion(-) Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
diff --git a/scripts/tracetool/format/d.py b/scripts/tracetool/format/d.py index 0afb5f3f47..353722f89c 100644 --- a/scripts/tracetool/format/d.py +++ b/scripts/tracetool/format/d.py @@ -13,6 +13,7 @@ __email__ = "stefanha@redhat.com" from tracetool import out +from sys import platform # Reserved keywords from @@ -34,7 +35,8 @@ def generate(events, backend, group): # SystemTap's dtrace(1) warns about empty "provider qemu {}" but is happy # with an empty file. Avoid the warning. - if not events: + # But dtrace on macOS can't deal with empty files. + if not events and platform != "darwin": return out('/* This file is autogenerated by tracetool, do not edit. */' @@ -44,6 +46,17 @@ def generate(events, backend, group): for e in events: args = [] for type_, name in e.args: + if platform == "darwin": + # macOS dtrace accepts only C99 _Bool + if type_ == 'bool': + type_ = '_Bool' + if type_ == 'bool *': + type_ = '_Bool *' + # It converts int8_t * in probe points to char * in header + # files and introduces [-Wpointer-sign] warning. + # Avoid it by changing probe type to signed char * beforehand. + if type_ == 'int8_t *': + type_ = 'signed char *' if name in RESERVED_WORDS: name += '_' args.append(type_ + ' ' + name)
dtrace USDT is fully supported since OS X 10.6. There are a few peculiarities compared to other dtrace flavors. 1. It doesn't accept empty files. 2. It doesn't recognize bool type but accepts C99 _Bool. 3. It converts int8_t * in probe points to char * in header files and introduces [-Wpointer-sign] warning. Cc: Cameron Esfahani <dirty@apple.com> Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com> --- scripts/tracetool/format/d.py | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-)