linux-kernel - [PATCH v2 08/21] libtracefs: Make parser unique to libtracefs

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Date:   Tue,  3 Aug 2021 00:23:34 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-trace-devel@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Tom Zanussi <zanussi@...nel.org>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Clark Williams <williams@...hat.com>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>
Subject: [PATCH v2 08/21] libtracefs: Make parser unique to libtracefs

From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>

Add %define api.prefix and defines to have the parser global variables use
tracefs_* instead of yy*, as without this, if a tool that links to this
library, and tries to use the synth sql parsing, it may end up using its
own yyparse() and friends functions.

Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
---
 src/sqlhist.y         | 10 ++++++++++
 src/tracefs-sqlhist.c |  2 +-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/sqlhist.y b/src/sqlhist.y
index ce9cb58fb3a9..9d03a457ae84 100644
--- a/src/sqlhist.y
+++ b/src/sqlhist.y
@@ -30,6 +30,16 @@ extern void yyerror(struct sqlhist_bison *, char *fmt, ...);
 %}
 
 %define api.pure
+
+/* Change the globals to use tracefs_ prefix */
+%define api.prefix{tracefs_}
+%code provides
+{
+  #define YYSTYPE TRACEFS_STYPE
+  #define yylex tracefs_lex
+  #define yyerror tracefs_error
+}
+
 %lex-param {void *scanner}
 %parse-param {struct sqlhist_bison *sb}
 
diff --git a/src/tracefs-sqlhist.c b/src/tracefs-sqlhist.c
index e8f77d60659f..933b3609733b 100644
--- a/src/tracefs-sqlhist.c
+++ b/src/tracefs-sqlhist.c
@@ -1021,7 +1021,7 @@ struct tracefs_synth *tracefs_sql(struct tep_handle *tep, const char *name,
 		return NULL;
 	}
 
-	ret = yyparse(&sb);
+	ret = tracefs_parse(&sb);
 	yylex_destroy(sb.scanner);
 
 	if (ret)
-- 
2.30.2