trace: move setting of group name into Makefiles

Having tracetool.py figure out the right group name from just
the input filename is not practical when considering the
different build vs src path combinations. Instead simply take
the group name as a command line arg from the Makefile, which
can trivially provide the right name.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-id: 20170125161417.31949-6-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

Makefile.target

@@ -50,6 +50,7 @@ endif
 
 $(QEMU_PROG).stp-installed: $(BUILD_DIR)/trace-events-all
 	$(call quiet-command,$(TRACETOOL) \
+		--group=all \
 		--format=stap \
 		--backends=$(TRACE_BACKENDS) \
 		--binary=$(bindir)/$(QEMU_PROG) \
@@ -59,6 +60,7 @@ $(QEMU_PROG).stp-installed: $(BUILD_DIR)/trace-events-all
 
 $(QEMU_PROG).stp: $(BUILD_DIR)/trace-events-all
 	$(call quiet-command,$(TRACETOOL) \
+		--group=all \
 		--format=stap \
 		--backends=$(TRACE_BACKENDS) \
 		--binary=$(realpath .)/$(QEMU_PROG) \
@@ -68,6 +70,7 @@ $(QEMU_PROG).stp: $(BUILD_DIR)/trace-events-all
 
 $(QEMU_PROG)-simpletrace.stp: $(BUILD_DIR)/trace-events-all
 	$(call quiet-command,$(TRACETOOL) \
+		--group=all \
 		--format=simpletrace-stap \
 		--backends=$(TRACE_BACKENDS) \
 		--probe-prefix=qemu.$(TARGET_TYPE).$(TARGET_NAME) \

scripts/tracetool.py

@@ -49,6 +49,7 @@ def error_opt(msg = None):
     --binary <path>          Full path to QEMU binary.
     --target-type <type>     QEMU emulator target type ('system' or 'user').
     --target-name <name>     QEMU emulator target name.
+    --group <name>           Name of the event group
     --probe-prefix <prefix>  Prefix for dtrace probe names
                              (default: qemu-<target-type>-<target-name>).\
 """ % {
@@ -62,22 +63,12 @@ def error_opt(msg = None):
     else:
         sys.exit(1)
 
-def make_group_name(filename):
-    dirname = os.path.realpath(os.path.dirname(filename))
-    basedir = os.path.join(os.path.dirname(__file__), os.pardir)
-    basedir = os.path.realpath(os.path.abspath(basedir))
-    dirname = dirname[len(basedir) + 1:]
-
-    if dirname == "":
-        return "common"
-    return "_" + re.sub(r"[^A-Za-z0-9]", "_", dirname)
-
 def main(args):
     global _SCRIPT
     _SCRIPT = args[0]
 
     long_opts = ["backends=", "format=", "help", "list-backends",
-                 "check-backends"]
+                 "check-backends", "group="]
     long_opts += ["binary=", "target-type=", "target-name=", "probe-prefix="]
 
     try:
@@ -88,6 +79,7 @@ def main(args):
     check_backends = False
     arg_backends = []
     arg_format = ""
+    arg_group = None
     binary = None
     target_type = None
     target_name = None
@@ -98,6 +90,8 @@ def main(args):
 
         elif opt == "--backends":
             arg_backends = arg.split(",")
+        elif opt == "--group":
+            arg_group = arg
         elif opt == "--format":
             arg_format = arg
 
@@ -129,6 +123,9 @@ def main(args):
                 sys.exit(1)
         sys.exit(0)
 
+    if arg_group is None:
+        error_opt("group name is required")
+
     if arg_format == "stap":
         if binary is None:
             error_opt("--binary is required for SystemTAP tapset generator")
@@ -145,10 +142,8 @@ def main(args):
     with open(args[0], "r") as fh:
         events = tracetool.read_events(fh)
 
-    group = make_group_name(args[0])
-
     try:
-        tracetool.generate(events, group, arg_format, arg_backends,
+        tracetool.generate(events, arg_group, arg_format, arg_backends,
                            binary=binary, probe_prefix=probe_prefix)
     except tracetool.TracetoolError as e:
         error_opt(str(e))

trace/Makefile.objs

@@ -20,6 +20,7 @@ $(obj)/generated-ust-provider.h: $(obj)/generated-ust-provider.h-timestamp
 	@cmp $< $@ >/dev/null 2>&1 || cp $< $@
 $(obj)/generated-ust-provider.h-timestamp: $(BUILD_DIR)/trace-events-all $(tracetool-y)
 	$(call quiet-command,$(TRACETOOL) \
+		--group=all \
 		--format=ust-events-h \
 		--backends=$(TRACE_BACKENDS) \
 		$< > $@,"GEN","$(patsubst %-timestamp,%,$@)")
@@ -28,6 +29,7 @@ $(obj)/generated-ust.c: $(obj)/generated-ust.c-timestamp $(BUILD_DIR)/config-hos
 	@cmp $< $@ >/dev/null 2>&1 || cp $< $@
 $(obj)/generated-ust.c-timestamp: $(BUILD_DIR)/trace-events-all $(tracetool-y)
 	$(call quiet-command,$(TRACETOOL) \
+		--group=all \
 		--format=ust-events-c \
 		--backends=$(TRACE_BACKENDS) \
 		$< > $@,"GEN","$(patsubst %-timestamp,%,$@)")
@@ -48,6 +50,7 @@ $(obj)/generated-tracers.h: $(obj)/generated-tracers.h-timestamp
 	@cmp -s $< $@ || cp $< $@
 $(obj)/generated-tracers.h-timestamp: $(BUILD_DIR)/trace-events-all $(BUILD_DIR)/config-host.mak $(tracetool-y)
 	$(call quiet-command,$(TRACETOOL) \
+		--group=all \
 		--format=h \
 		--backends=$(TRACE_BACKENDS) \
 		$< > $@,"GEN","$(patsubst %-timestamp,%,$@)")
@@ -59,6 +62,7 @@ $(obj)/generated-tracers.c: $(obj)/generated-tracers.c-timestamp
 	@cmp -s $< $@ || cp $< $@
 $(obj)/generated-tracers.c-timestamp: $(BUILD_DIR)/trace-events-all $(BUILD_DIR)/config-host.mak $(tracetool-y)
 	$(call quiet-command,$(TRACETOOL) \
+		--group=all \
 		--format=c \
 		--backends=$(TRACE_BACKENDS) \
 		$< > $@,"GEN","$(patsubst %-timestamp,%,$@)")
@@ -77,6 +81,7 @@ $(obj)/generated-tracers-dtrace.dtrace: $(obj)/generated-tracers-dtrace.dtrace-t
 	@cmp $< $@ >/dev/null 2>&1 || cp $< $@
 $(obj)/generated-tracers-dtrace.dtrace-timestamp: $(BUILD_DIR)/trace-events-all $(BUILD_DIR)/config-host.mak $(tracetool-y)
 	$(call quiet-command,$(TRACETOOL) \
+		--group=all \
 		--format=d \
 		--backends=$(TRACE_BACKENDS) \
 		$< > $@,"GEN","$(patsubst %-timestamp,%,$@)")
@@ -96,6 +101,7 @@ $(obj)/generated-helpers-wrappers.h: $(obj)/generated-helpers-wrappers.h-timesta
 	@cmp $< $@ >/dev/null 2>&1 || cp $< $@
 $(obj)/generated-helpers-wrappers.h-timestamp: $(BUILD_DIR)/trace-events-all $(BUILD_DIR)/config-host.mak $(tracetool-y)
 	$(call quiet-command,$(TRACETOOL) \
+		--group=all \
 		--format=tcg-helper-wrapper-h \
 		--backend=$(TRACE_BACKENDS) \
 		$< > $@,"GEN","$(patsubst %-timestamp,%,$@)")
@@ -104,6 +110,7 @@ $(obj)/generated-helpers.h: $(obj)/generated-helpers.h-timestamp
 	@cmp $< $@ >/dev/null 2>&1 || cp $< $@
 $(obj)/generated-helpers.h-timestamp: $(BUILD_DIR)/trace-events-all $(BUILD_DIR)/config-host.mak $(tracetool-y)
 	$(call quiet-command,$(TRACETOOL) \
+		--group=all \
 		--format=tcg-helper-h \
 		--backend=$(TRACE_BACKENDS) \
 		$< > $@,"GEN","$(patsubst %-timestamp,%,$@)")
@@ -112,6 +119,7 @@ $(obj)/generated-helpers.c: $(obj)/generated-helpers.c-timestamp
 	@cmp $< $@ >/dev/null 2>&1 || cp $< $@
 $(obj)/generated-helpers.c-timestamp: $(BUILD_DIR)/trace-events-all $(BUILD_DIR)/config-host.mak $(tracetool-y)
 	$(call quiet-command,$(TRACETOOL) \
+		--group=all \
 		--format=tcg-helper-c \
 		--backend=$(TRACE_BACKENDS) \
 		$< > $@,"GEN","$(patsubst %-timestamp,%,$@)")
@@ -125,6 +133,7 @@ $(obj)/generated-tcg-tracers.h: $(obj)/generated-tcg-tracers.h-timestamp
 	@cmp $< $@ >/dev/null 2>&1 || cp $< $@
 $(obj)/generated-tcg-tracers.h-timestamp: $(BUILD_DIR)/trace-events-all $(BUILD_DIR)/config-host.mak $(tracetool-y)
 	$(call quiet-command,$(TRACETOOL) \
+		--group=all \
 		--format=tcg-h \
 		--backend=$(TRACE_BACKENDS) \
 		$< > $@,"GEN","$(patsubst %-timestamp,%,$@)")