perf trace: Add interface to access perf data from Perl handlers

The Perl scripting support for perf trace allows most of a trace
event's data to be accessed directly as handler arguments, but
not all of it e.g. the less common fields aren't passed in.  To
give scripts access to the other fields and/or any other data or
metadata in the main perf executable that might be useful, a way
to access the C data in perf from Perl is needed; this patch
uses the Perl XS facility to do it for the common_xxx event
fields not passed to handler functions.

Context.pm exports three functions to Perl scripts that access
fields for the current event by calling back into perf:
common_pc(), common_flags() and common_lock_depth().  Support
for common_flags() field values was added to Core.pm and a
script used to sanity check these and other basic scripting
features, check-perf-trace.pl, was also added.

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Cc: fweisbec@gmail.com
Cc: rostedt@goodmis.org
Cc: anton@samba.org
Cc: hch@infradead.org
LKML-Reference: <1259133352-23685-6-git-send-email-tzanussi@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

13 files changed, 474 insertions, 13 deletions

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index efbc0e864212..8ad57b51d648 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -497,6 +497,7 @@ ifneq ($(shell sh -c "(echo '\#include <EXTERN.h>'; echo '\#include <perl.h>'; e
         BASIC_CFLAGS += -DNO_LIBPERL
 else
         ALL_LDFLAGS += $(PERL_EMBED_LDOPTS)
+        LIB_OBJS += scripts/perl/Perf-Trace-Util/Context.o
 endif
 
 ifdef NO_DEMANGLE
@@ -873,6 +874,9 @@ util/find_next_bit.o: ../../lib/find_next_bit.c PERF-CFLAGS
 util/trace-event-perl.o: util/trace-event-perl.c PERF-CFLAGS
         $(QUIET_CC)$(CC) -o util/trace-event-perl.o -c $(ALL_CFLAGS) $(PERL_EMBED_CCOPTS) -Wno-redundant-decls -Wno-strict-prototypes  -Wno-unused-parameter $<
 
+scripts/perl/Perf-Trace-Util/Context.o: scripts/perl/Perf-Trace-Util/Context.c PERF-CFLAGS
+        $(QUIET_CC)$(CC) -o scripts/perl/Perf-Trace-Util/Context.o -c $(ALL_CFLAGS) $(PERL_EMBED_CCOPTS) -Wno-redundant-decls -Wno-strict-prototypes -Wno-unused-parameter -Wno-nested-externs $<
+
 perf-%$X: %.o $(PERFLIBS)
         $(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS)
 
@@ -1072,7 +1076,7 @@ distclean: clean
 #       $(RM) configure
 
 clean:
-        $(RM) *.o */*.o $(LIB_FILE)
+        $(RM) *.o */*.o */*/*.o */*/*/*.o $(LIB_FILE)
         $(RM) $(ALL_PROGRAMS) $(BUILT_INS) perf$X
         $(RM) $(TEST_PROGRAMS)
         $(RM) *.spec *.pyc *.pyo */*.pyc */*.pyo common-cmds.h TAGS tags cscope*
diff --git a/tools/perf/scripts/perl/Perf-Trace-Util/Context.c b/tools/perf/scripts/perl/Perf-Trace-Util/Context.c
new file mode 100644
index 000000000000..3ba3ffc54164
--- /dev/null
+++ b/tools/perf/scripts/perl/Perf-Trace-Util/Context.c
@@ -0,0 +1,134 @@
+/*
+ * This file was generated automatically by ExtUtils::ParseXS version 2.18_02 from the
+ * contents of Context.xs. Do not edit this file, edit Context.xs instead.
+ *
+ *      ANY CHANGES MADE HERE WILL BE LOST! 
+ *
+ */
+
+#line 1 "Context.xs"
+/*
+ * Context.xs.  XS interfaces for perf trace.
+ *
+ * Copyright (C) 2009 Tom Zanussi <tzanussi@gmail.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include "EXTERN.h"
+#include "perl.h"
+#include "XSUB.h"
+#include "../../../util/trace-event-perl.h"
+
+#ifndef PERL_UNUSED_VAR
+#  define PERL_UNUSED_VAR(var) if (0) var = var
+#endif
+
+#line 41 "Context.c"
+
+XS(XS_Perf__Trace__Context_get_common_pc); /* prototype to pass -Wmissing-prototypes */
+XS(XS_Perf__Trace__Context_get_common_pc)
+{
+#ifdef dVAR
+    dVAR; dXSARGS;
+#else
+    dXSARGS;
+#endif
+    if (items != 1)
+       Perl_croak(aTHX_ "Usage: %s(%s)", "Perf::Trace::Context::get_common_pc", "context");
+    PERL_UNUSED_VAR(cv); /* -W */
+    {
+        struct scripting_context *      context = INT2PTR(struct scripting_context *,SvIV(ST(0)));
+        int     RETVAL;
+        dXSTARG;
+
+        RETVAL = get_common_pc(context);
+        XSprePUSH; PUSHi((IV)RETVAL);
+    }
+    XSRETURN(1);
+}
+
+
+XS(XS_Perf__Trace__Context_get_common_flags); /* prototype to pass -Wmissing-prototypes */
+XS(XS_Perf__Trace__Context_get_common_flags)
+{
+#ifdef dVAR
+    dVAR; dXSARGS;
+#else
+    dXSARGS;
+#endif
+    if (items != 1)
+       Perl_croak(aTHX_ "Usage: %s(%s)", "Perf::Trace::Context::get_common_flags", "context");
+    PERL_UNUSED_VAR(cv); /* -W */
+    {
+        struct scripting_context *      context = INT2PTR(struct scripting_context *,SvIV(ST(0)));
+        int     RETVAL;
+        dXSTARG;
+
+        RETVAL = get_common_flags(context);
+        XSprePUSH; PUSHi((IV)RETVAL);
+    }
+    XSRETURN(1);
+}
+
+
+XS(XS_Perf__Trace__Context_get_common_lock_depth); /* prototype to pass -Wmissing-prototypes */
+XS(XS_Perf__Trace__Context_get_common_lock_depth)
+{
+#ifdef dVAR
+    dVAR; dXSARGS;
+#else
+    dXSARGS;
+#endif
+    if (items != 1)
+       Perl_croak(aTHX_ "Usage: %s(%s)", "Perf::Trace::Context::get_common_lock_depth", "context");
+    PERL_UNUSED_VAR(cv); /* -W */
+    {
+        struct scripting_context *      context = INT2PTR(struct scripting_context *,SvIV(ST(0)));
+        int     RETVAL;
+        dXSTARG;
+
+        RETVAL = get_common_lock_depth(context);
+        XSprePUSH; PUSHi((IV)RETVAL);
+    }
+    XSRETURN(1);
+}
+
+#ifdef __cplusplus
+extern "C"
+#endif
+XS(boot_Perf__Trace__Context); /* prototype to pass -Wmissing-prototypes */
+XS(boot_Perf__Trace__Context)
+{
+#ifdef dVAR
+    dVAR; dXSARGS;
+#else
+    dXSARGS;
+#endif
+    const char* file = __FILE__;
+
+    PERL_UNUSED_VAR(cv); /* -W */
+    PERL_UNUSED_VAR(items); /* -W */
+    XS_VERSION_BOOTCHECK ;
+