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trace: [tcg] Define TCG tracing helper routines

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Generates file "trace/generated-helpers.c" with TCG helper definitions to trace
events in guest code at execution time.

The helpers ('helper_trace_${event}_exec_proxy') cast the TCG-compatible native
argument types to their original types (as defined in "trace-events") and call
the tracing routine ('trace_${event}_exec').

Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Lluís Vilanova 2014-05-30 14:11:56 +02:00 committed by Stefan Hajnoczi
parent 707c8a98e4
commit 341ea69185
6 changed files with 75 additions and 1 deletions
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1
.gitignore vendored
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@ -12,6 +12,7 @@
/trace/generated-events.h
/trace/generated-events.c
/trace/generated-helpers.h
/trace/generated-helpers.c
/trace/generated-ust-provider.h
/trace/generated-ust.c
/libcacard/trace/generated-tracers.c

1
Makefile
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@ -58,6 +58,7 @@ endif
GENERATED_SOURCES += trace/generated-tracers.c
GENERATED_HEADERS += trace/generated-helpers.h
GENERATED_SOURCES += trace/generated-helpers.c
ifeq ($(findstring ust,$(TRACE_BACKENDS)),ust)
GENERATED_HEADERS += trace/generated-ust-provider.h

7
Makefile.objs
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@ -1,7 +1,7 @@
#######################################################################
# Common libraries for tools and emulators
stub-obj-y = stubs/
util-obj-y = util/ qobject/ qapi/ trace/
util-obj-y = util/ qobject/ qapi/
#######################################################################
# block-obj-y is code used by both qemu system emulation and qemu-img
@ -106,6 +106,11 @@ common-obj-y += disas/
version-obj-$(CONFIG_WIN32) += $(BUILD_DIR)/version.o
version-lobj-$(CONFIG_WIN32) += $(BUILD_DIR)/version.lo
######################################################################
# tracing
util-obj-y += trace/
target-obj-y += trace/
######################################################################
# guest agent

5
Makefile.target
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@ -159,15 +159,20 @@ endif # CONFIG_SOFTMMU
dummy := $(call unnest-vars,,obj-y)
all-obj-y := $(obj-y)
target-obj-y :=
block-obj-y :=
common-obj-y :=
include $(SRC_PATH)/Makefile.objs
dummy := $(call unnest-vars,,target-obj-y)
target-obj-y-save := $(target-obj-y)
dummy := $(call unnest-vars,.., \
block-obj-y \
block-obj-m \
common-obj-y \
common-obj-m)
target-obj-y := $(target-obj-y-save)
all-obj-y += $(common-obj-y)
all-obj-y += $(target-obj-y)
all-obj-$(CONFIG_SOFTMMU) += $(block-obj-y)
# build either PROG or PROGW

50
scripts/tracetool/format/tcg_helper_c.py Normal file
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@ -0,0 +1,50 @@
#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Generate trace/generated-helpers.c.
"""
__author__ = "Lluís Vilanova <vilanova@ac.upc.edu>"
__copyright__ = "Copyright 2012-2014, Lluís Vilanova <vilanova@ac.upc.edu>"
__license__ = "GPL version 2 or (at your option) any later version"
__maintainer__ = "Stefan Hajnoczi"
__email__ = "stefanha@linux.vnet.ibm.com"
from tracetool import out
from tracetool.transform import *
def generate(events, backend):
events = [e for e in events
if "disable" not in e.properties]
out('/* This file is autogenerated by tracetool, do not edit. */',
'',
'#include "qemu-common.h"',
'#include "trace.h"',
'#include "exec/helper-proto.h"',
'',
)
for e in events:
if "tcg-exec" not in e.properties:
continue
# tracetool.generate always transforms types to host
e_args = e.original.args
values = ["(%s)%s" % (t, n)
for t, n in e.args.transform(TCG_2_TCG_HELPER_DEF)]
out('void %(name_tcg)s(%(args)s)',
'{',
' %(name)s(%(values)s);',
'}',
name_tcg="helper_%s_proxy" % e.api(),
name=e.api(),
args=e_args.transform(HOST_2_TCG_COMPAT, TCG_2_TCG_HELPER_DEF),
values=", ".join(values),
)

12
trace/Makefile.objs
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@ -107,6 +107,18 @@ $(obj)/generated-helpers.h-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/conf
< $< > $@," GEN $(patsubst %-timestamp,%,$@)")
@cmp -s $@ $(patsubst %-timestamp,%,$@) || cp $@ $(patsubst %-timestamp,%,$@)
$(obj)/generated-helpers.c: $(obj)/generated-helpers.c-timestamp
$(obj)/generated-helpers.c-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak
$(call quiet-command,$(TRACETOOL) \
--format=tcg-helper-c \
--backend=$(TRACE_BACKENDS) \
< $< > $@," GEN $(patsubst %-timestamp,%,$@)")
@cmp -s $@ $(patsubst %-timestamp,%,$@) || cp $@ $(patsubst %-timestamp,%,$@)
$(obj)/generated-helpers.o: $(obj)/generated-helpers.c
target-obj-y += generated-helpers.o
######################################################################
# Backend code