trace: [tcg] Generate TCG tracing routines

Generate header "trace/generated-tcg-tracers.h" with the necessary routines for
tracing events in guest code:

* trace_${event}_tcg

  Convenience wrapper that calls the translation-time tracer
  'trace_${event}_trans', and calls 'gen_helper_trace_${event}_exec to
  generate the TCG code to later trace the event at execution time.
Signed-off-by: NLluís Vilanova <vilanova@ac.upc.edu>
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>

.gitignore

@@ -14,6 +14,7 @@
 /trace/generated-helpers-wrappers.h
 /trace/generated-helpers.h
 /trace/generated-helpers.c
+/trace/generated-tcg-tracers.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-tcg-tracers.h
+
 GENERATED_HEADERS += trace/generated-helpers-wrappers.h
 GENERATED_HEADERS += trace/generated-helpers.h
 GENERATED_SOURCES += trace/generated-helpers.c

include/trace-tcg.h

+#ifndef TRACE_TCG_H
+#define TRACE_TCG_H
+
+#include "trace/generated-tcg-tracers.h"
+#include "trace/generated-events.h"
+
+#endif  /* TRACE_TCG_H */

scripts/tracetool/format/tcg_h.py

+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Generate .h file for TCG code generation.
+"""
+
+__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
+
+
+def generate(events, backend):
+    out('/* This file is autogenerated by tracetool, do not edit. */',
+        '/* You must include this file after the inclusion of helper.h */',
+        '',
+        '#ifndef TRACE__GENERATED_TCG_TRACERS_H',
+        '#define TRACE__GENERATED_TCG_TRACERS_H',
+        '',
+        '#include <stdint.h>',
+        '',
+        '#include "trace.h"',
+        '#include "exec/helper-proto.h"',
+        '',
+        )
+
+    for e in events:
+        # just keep one of them
+        if "tcg-trans" not in e.properties:
+            continue
+
+        # get the original event definition
+        e = e.original.original
+
+        out('static inline void %(name_tcg)s(%(args)s)',
+            '{',
+            name_tcg=e.api(e.QEMU_TRACE_TCG),
+            args=e.args)
+
+        if "disable" not in e.properties:
+            out('    %(name_trans)s(%(argnames_trans)s);',
+                '    gen_helper_%(name_exec)s(%(argnames_exec)s);',
+                name_trans=e.event_trans.api(e.QEMU_TRACE),
+                name_exec=e.event_exec.api(e.QEMU_TRACE),
+                argnames_trans=", ".join(e.event_trans.args.names()),
+                argnames_exec=", ".join(e.event_exec.args.names()))
+
+        out('}')
+
+    out('',
+        '#endif /* TRACE__GENERATED_TCG_TRACERS_H */')

trace/Makefile.objs

@@ -128,6 +128,15 @@ $(obj)/generated-helpers.o: $(obj)/generated-helpers.c
 target-obj-y += generated-helpers.o
 
 
+$(obj)/generated-tcg-tracers.h: $(obj)/generated-tcg-tracers.h-timestamp
+$(obj)/generated-tcg-tracers.h-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak
+	$(call quiet-command,$(TRACETOOL) \
+		--format=tcg-h \
+		--backend=$(TRACE_BACKENDS) \
+		< $< > $@,"  GEN   $(patsubst %-timestamp,%,$@)")
+	@cmp -s $@ $(patsubst %-timestamp,%,$@) || cp $@ $(patsubst %-timestamp,%,$@)
+
+
 ######################################################################
 # Backend code