[PATCH] perf tools: Allow expressions in __print_symbolic() fields

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The __print_symbolic() function takes a sequence of key-value pairs for
pretty-printing a constant.  The new kvm:kvm_exit print fmt uses the

  __print_symbolic(..., { 0x040 + 1, "DB excp" }, ...)

Currently only atoms are supported and this print fmt fails to parse.
This patch adds support for expressions instead of just atoms so that
0x040 + 1 is parsed successfully.  Also add arg_num_eval() support for
the '+' operator.

Signed-off-by: Stefan Hajnoczi <stefanha@xxxxxxxxxxxxxxxxxx>
The kvm:kvm_exit event was not recording enough information to format it.  I
recently fixed this by introducing a __print_symbolic(), this commit has not
yet hit linux.git but I think it will soon.  In order to correctly format the
new kvm:kvm_exit, this patch to extend event parsing is required.

 tools/perf/util/trace-event-parse.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
index 0a7ed5b..d0a4548 100644
--- a/tools/perf/util/trace-event-parse.c
+++ b/tools/perf/util/trace-event-parse.c
@@ -1425,6 +1425,11 @@ static long long arg_num_eval(struct print_arg *arg)
 				die("unknown op '%s'", arg->op.op);
+		case '+':
+			left = arg_num_eval(arg->op.left);
+			right = arg_num_eval(arg->op.right);
+			val = left + right;
+			break;
 			die("unknown op '%s'", arg->op.op);
@@ -1485,6 +1490,13 @@ process_fields(struct event *event, struct print_flag_sym **list, char **tok)
 		type = process_arg(event, arg, &token);
+		if (type == EVENT_OP)
+			type = process_op(event, arg, &token);
+		if (type == EVENT_ERROR)
+			goto out_free;
 		if (test_type_token(type, token, EVENT_DELIM, ","))
 			goto out_free;

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