Commit 320fba2a authored by Fabien Chouteau's avatar Fabien Chouteau Committed by Blue Swirl
Browse files

New trace-event backend: stderr



This backend sends trace events to standard error output during the emulation.

Also add a "--list-backends" option to tracetool, so configure script can
display the list of available backends.

Signed-off-by: default avatarFabien Chouteau <chouteau@adacore.com>
Acked-by: default avatarStefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: default avatarBlue Swirl <blauwirbel@gmail.com>
parent 491e2a33
......@@ -907,7 +907,8 @@ echo " --enable-docs enable documentation build"
echo " --disable-docs disable documentation build"
echo " --disable-vhost-net disable vhost-net acceleration support"
echo " --enable-vhost-net enable vhost-net acceleration support"
echo " --enable-trace-backend=B Trace backend nop simple ust dtrace"
echo " --enable-trace-backend=B Set trace backend"
echo " Available backends:" $("$source_path"/scripts/tracetool --list-backends)
echo " --with-trace-file=NAME Full PATH,NAME of file to store traces"
echo " Default:trace-<pid>"
echo " --disable-spice disable spice"
......
......@@ -133,6 +133,11 @@ source tree. It may not be as powerful as platform-specific or third-party
trace backends but it is portable. This is the recommended trace backend
unless you have specific needs for more advanced backends.
=== Stderr ===
The "stderr" backend sends trace events directly to standard error output
during emulation.
==== Monitor commands ====
* info trace
......
......@@ -13,12 +13,13 @@ set -f
usage()
{
cat >&2 <<EOF
usage: $0 [--nop | --simple | --ust] [-h | -c]
usage: $0 [--nop | --simple | --stderr | --ust | --dtrace] [-h | -c]
Generate tracing code for a file on stdin.
Backends:
--nop Tracing disabled
--simple Simple built-in backend
--stderr Stderr built-in backend
--ust LTTng User Space Tracing backend
--dtrace DTrace/SystemTAP backend
......@@ -236,6 +237,56 @@ linetoc_end_simple()
EOF
}
#STDERR
linetoh_begin_stderr()
{
cat <<EOF
#include <stdio.h>
EOF
}
linetoh_stderr()
{
local name args argnames argc fmt
name=$(get_name "$1")
args=$(get_args "$1")
argnames=$(get_argnames "$1" ",")
argc=$(get_argc "$1")
fmt=$(get_fmt "$1")
if [ "$argc" -gt 0 ]; then
argnames=", $argnames"
fi
cat <<EOF
static inline void trace_$name($args)
{
fprintf(stderr, "$name $fmt\n" $argnames);
}
EOF
}
linetoh_end_stderr()
{
return
}
linetoc_begin_stderr()
{
return
}
linetoc_stderr()
{
return
}
linetoc_end_stderr()
{
return
}
#END OF STDERR
# Clean up after UST headers which pollute the namespace
ust_clean_namespace() {
cat <<EOF
......@@ -546,7 +597,7 @@ targetarch=
until [ -z "$1" ]
do
case "$1" in
"--nop" | "--simple" | "--ust" | "--dtrace") backend="${1#--}" ;;
"--nop" | "--simple" | "--stderr" | "--ust" | "--dtrace") backend="${1#--}" ;;
"--binary") shift ; binary="$1" ;;
"--target-arch") shift ; targetarch="$1" ;;
......@@ -557,6 +608,11 @@ do
"--check-backend") exit 0 ;; # used by ./configure to test for backend
"--list-backends") # used by ./configure to list available backends
echo "nop simple stderr ust dtrace"
exit 0
;;
*)
usage;;
esac
......
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