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perf expr: Move expr lexer to flex

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Adding expr flex code instead of the manual parser code. So it's easily
extensible in upcoming changes.

The new flex code is in flex.l object and gets compiled like all the
other flexers we use.  It's defined as flex reentrant parser.

It's used by both expr__parse and expr__find_other interfaces by
separating the starting point.

There's no intended change of functionality ;-) the test expr is
passing.

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/20200228093616.67125-3-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2020-02-28 10:36:13 +01:00 • committed by Arnaldo Carvalho de Melo
parent 576a65b697
commit 26226a9772
5 changed files with 247 additions and 141 deletions
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2
tools/perf/util/expr.h
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@ -17,9 +17,7 @@ struct parse_ctx {
void expr__ctx_init(struct parse_ctx *ctx);
void expr__add_id(struct parse_ctx *ctx, const char *id, double val);
#ifndef IN_EXPR_Y
int expr__parse(double *final_val, struct parse_ctx *ctx, const char **pp);
#endif
int expr__find_other(const char *p, const char *one, const char ***other,
int *num_other);