perf expr: Straighten expr__parse()/expr__find_other() interface

Now that we have a flex parser we don't need to update the parsed string
pointer, so the interface can just be passed the pointer to the
expression instead of a pointer to pointer.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: John Garry <john.garry@huawei.com>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Link: http://lore.kernel.org/lkml/20200228093616.67125-5-jolsa@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/expr.c

@@ -10,7 +10,7 @@ static int test(struct parse_ctx *ctx, const char *e, double val2)
 {
 	double val;
 
-	if (expr__parse(&val, ctx, &e))
+	if (expr__parse(&val, ctx, e))
 		TEST_ASSERT_VAL("parse test failed", 0);
 	TEST_ASSERT_VAL("unexpected value", val == val2);
 	return 0;
@@ -44,11 +44,11 @@ int test__expr(struct test *t __maybe_unused, int subtest __maybe_unused)
 		return ret;
 
 	p = "FOO/0";
-	ret = expr__parse(&val, &ctx, &p);
+	ret = expr__parse(&val, &ctx, p);
 	TEST_ASSERT_VAL("division by zero", ret == 1);
 
 	p = "BAR/";
-	ret = expr__parse(&val, &ctx, &p);
+	ret = expr__parse(&val, &ctx, p);
 	TEST_ASSERT_VAL("missing operand", ret == 1);
 
 	TEST_ASSERT_VAL("find other",

tools/perf/util/expr.c

@@ -52,9 +52,9 @@ __expr__parse(double *val, struct parse_ctx *ctx, const char *expr,
 	return ret;
 }
 
-int expr__parse(double *final_val, struct parse_ctx *ctx, const char **pp)
+int expr__parse(double *final_val, struct parse_ctx *ctx, const char *expr)
 {
-	return __expr__parse(final_val, ctx, *pp, EXPR_PARSE);
+	return __expr__parse(final_val, ctx, expr, EXPR_PARSE);
 }
 
 static bool
@@ -71,14 +71,14 @@ already_seen(const char *val, const char *one, const char **other,
 	return false;
 }
 
-int expr__find_other(const char *p, const char *one, const char ***other,
+int expr__find_other(const char *expr, const char *one, const char ***other,
 		     int *num_other)
 {
 	int err, i = 0, j = 0;
 	struct parse_ctx ctx;
 
 	expr__ctx_init(&ctx);
-	err = __expr__parse(NULL, &ctx, p, EXPR_OTHER);
+	err = __expr__parse(NULL, &ctx, expr, EXPR_OTHER);
 	if (err)
 		return -1;
 

tools/perf/util/expr.h

@@ -17,8 +17,8 @@ struct parse_ctx {
 
 void expr__ctx_init(struct parse_ctx *ctx);
 void expr__add_id(struct parse_ctx *ctx, const char *id, double val);
-int expr__parse(double *final_val, struct parse_ctx *ctx, const char **pp);
-int expr__find_other(const char *p, const char *one, const char ***other,
+int expr__parse(double *final_val, struct parse_ctx *ctx, const char *expr);
+int expr__find_other(const char *expr, const char *one, const char ***other,
 		int *num_other);
 
 #endif

tools/perf/util/stat-shadow.c

@@ -777,9 +777,7 @@ static void generic_metric(struct perf_stat_config *config,
 	}
 
 	if (!metric_events[i]) {
-		const char *p = metric_expr;
-
-		if (expr__parse(&ratio, &pctx, &p) == 0) {
+		if (expr__parse(&ratio, &pctx, metric_expr) == 0) {
 			char *unit;
 			char metric_bf[64];