trace: [tcg] Declare TCG tracing helper routines

Generates file "trace/generated-helpers.h" with TCG helper declarations to trace
events in guest code at execution time ('trace_${event}_exec_proxy').

Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

.gitignore

@@ -11,6 +11,7 @@
 /trace/generated-tracers.dtrace
 /trace/generated-events.h
 /trace/generated-events.c
+/trace/generated-helpers.h
 /trace/generated-ust-provider.h
 /trace/generated-ust.c
 /libcacard/trace/generated-tracers.c

Makefile

@@ -57,6 +57,8 @@ GENERATED_HEADERS += trace/generated-tracers-dtrace.h
 endif
 GENERATED_SOURCES += trace/generated-tracers.c
 
+GENERATED_HEADERS += trace/generated-helpers.h
+
 ifeq ($(findstring ust,$(TRACE_BACKENDS)),ust)
 GENERATED_HEADERS += trace/generated-ust-provider.h
 GENERATED_SOURCES += trace/generated-ust.c

scripts/tracetool/__init__.py

@@ -227,6 +227,7 @@ class Event(object):
                                           fmt)
 
     QEMU_TRACE               = "trace_%(name)s"
+    QEMU_TRACE_TCG           = QEMU_TRACE + "_tcg"
 
     def api(self, fmt=None):
         if fmt is None:

scripts/tracetool/format/tcg_helper_h.py

@@ -0,0 +1,50 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Generate trace/generated-helpers.h.
+"""
+
+__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. */',
+        '',
+        )
+
+    for e in events:
+        if "tcg-exec" not in e.properties:
+            continue
+
+        # tracetool.generate always transforms types to host
+        e_args = e.original.args
+
+        # TCG helper proxy declaration
+        fmt = "DEF_HELPER_FLAGS_%(argc)d(%(name)s, %(flags)svoid%(types)s)"
+        args = e_args.transform(HOST_2_TCG_COMPAT, HOST_2_TCG,
+                                TCG_2_TCG_HELPER_DECL)
+        types = ", ".join(args.types())
+        if types != "":
+            types = ", " + types
+
+        flags = "TCG_CALL_NO_RWG, "
+
+        out(fmt,
+            flags=flags,
+            argc=len(args),
+            name=e.api() + "_proxy",
+            types=types,
+            )

trace/Makefile.objs

@@ -49,6 +49,9 @@ util-obj-y += generated-events.o
 ######################################################################
 # Auto-generated tracing routines
 
+##################################################
+# Execution level
+
 $(obj)/generated-tracers.h: $(obj)/generated-tracers.h-timestamp
 	@cmp -s $< $@ || cp $< $@
 $(obj)/generated-tracers.h-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak
@@ -57,8 +60,8 @@ $(obj)/generated-tracers.h-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/conf
 		--backends=$(TRACE_BACKENDS) \
 		< $< > $@,"  GEN   $(patsubst %-timestamp,%,$@)")
 
-######################################################################
+##############################
-# Auto-generated tracing routines (non-DTrace)
+# non-DTrace
 
 $(obj)/generated-tracers.c: $(obj)/generated-tracers.c-timestamp
 	@cmp -s $< $@ || cp $< $@
@@ -70,9 +73,8 @@ $(obj)/generated-tracers.c-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/conf
 
 $(obj)/generated-tracers.o: $(obj)/generated-tracers.c $(obj)/generated-tracers.h
 
-
+##############################
-######################################################################
+# DTrace
-# Auto-generated DTrace code
 
 # Normal practice is to name DTrace probe file with a '.d' extension
 # but that gets picked up by QEMU's Makefile as an external dependency
@@ -94,6 +96,18 @@ $(obj)/generated-tracers-dtrace.o: $(obj)/generated-tracers-dtrace.dtrace
 util-obj-y += generated-tracers-dtrace.o
 endif
 
+##################################################
+# Translation level
+
+$(obj)/generated-helpers.h: $(obj)/generated-helpers.h-timestamp
+$(obj)/generated-helpers.h-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak
+	$(call quiet-command,$(TRACETOOL) \
+		--format=tcg-helper-h \
+		--backend=$(TRACE_BACKENDS) \
+		< $< > $@,"  GEN   $(patsubst %-timestamp,%,$@)")
+	@cmp -s $@ $(patsubst %-timestamp,%,$@) || cp $@ $(patsubst %-timestamp,%,$@)
+
+
 ######################################################################
 # Backend code