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perf expr: Move expr lexer to flex 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
tools/perf/util/Build
View File

@ -121,6 +121,7 @@ perf-y += mem-events.o
perf-y += vsprintf.o
perf-y += units.o
perf-y += time-utils.o
perf-y += expr-flex.o
perf-y += expr-bison.o
perf-y += expr.o
perf-y += branch.o
@ -190,9 +191,13 @@ $(OUTPUT)util/parse-events-bison.c: util/parse-events.y
$(call rule_mkdir)
$(Q)$(call echo-cmd,bison)$(BISON) -v util/parse-events.y -d $(PARSER_DEBUG_BISON) -o $@ -p parse_events_
$(OUTPUT)util/expr-flex.c: util/expr.l $(OUTPUT)util/expr-bison.c
$(call rule_mkdir)
$(Q)$(call echo-cmd,flex)$(FLEX) -o $@ --header-file=$(OUTPUT)util/expr-flex.h $(PARSER_DEBUG_FLEX) util/expr.l
$(OUTPUT)util/expr-bison.c: util/expr.y
$(call rule_mkdir)
$(Q)$(call echo-cmd,bison)$(BISON) -v util/expr.y -d $(PARSER_DEBUG_BISON) -o $@ -p expr__
$(Q)$(call echo-cmd,bison)$(BISON) -v util/expr.y -d $(PARSER_DEBUG_BISON) -o $@ -p expr_
$(OUTPUT)util/pmu-flex.c: util/pmu.l $(OUTPUT)util/pmu-bison.c
$(call rule_mkdir)
@ -204,12 +209,14 @@ $(OUTPUT)util/pmu-bison.c: util/pmu.y
CFLAGS_parse-events-flex.o += -w
CFLAGS_pmu-flex.o += -w
CFLAGS_expr-flex.o += -w
CFLAGS_parse-events-bison.o += -DYYENABLE_NLS=0 -w
CFLAGS_pmu-bison.o += -DYYENABLE_NLS=0 -DYYLTYPE_IS_TRIVIAL=0 -w
CFLAGS_expr-bison.o += -DYYENABLE_NLS=0 -DYYLTYPE_IS_TRIVIAL=0 -w
$(OUTPUT)util/parse-events.o: $(OUTPUT)util/parse-events-flex.c $(OUTPUT)util/parse-events-bison.c
$(OUTPUT)util/pmu.o: $(OUTPUT)util/pmu-flex.c $(OUTPUT)util/pmu-bison.c
$(OUTPUT)util/expr.o: $(OUTPUT)util/expr-flex.c $(OUTPUT)util/expr-bison.c
CFLAGS_bitmap.o += -Wno-unused-parameter -DETC_PERFCONFIG="BUILD_STR($(ETC_PERFCONFIG_SQ))"
CFLAGS_find_bit.o += -Wno-unused-parameter -DETC_PERFCONFIG="BUILD_STR($(ETC_PERFCONFIG_SQ))"
@ -217,6 +224,7 @@ CFLAGS_rbtree.o += -Wno-unused-parameter -DETC_PERFCONFIG="BUILD_STR($(ET
CFLAGS_libstring.o += -Wno-unused-parameter -DETC_PERFCONFIG="BUILD_STR($(ETC_PERFCONFIG_SQ))"
CFLAGS_hweight.o += -Wno-unused-parameter -DETC_PERFCONFIG="BUILD_STR($(ETC_PERFCONFIG_SQ))"
CFLAGS_parse-events.o += -Wno-redundant-decls
CFLAGS_expr.o += -Wno-redundant-decls
CFLAGS_header.o += -include $(OUTPUT)PERF-VERSION-FILE
$(OUTPUT)util/kallsyms.o: ../lib/symbol/kallsyms.c FORCE

93
tools/perf/util/expr.c
View File

@ -1,6 +1,14 @@
// SPDX-License-Identifier: GPL-2.0
#include <stdbool.h>
#include <assert.h>
#include "expr.h"
#include "expr-bison.h"
#define YY_EXTRA_TYPE int
#include "expr-flex.h"
#ifdef PARSER_DEBUG
extern int expr_debug;
#endif
/* Caller must make sure id is allocated */
void expr__add_id(struct parse_ctx *ctx, const char *name, double val)
@ -17,3 +25,88 @@ void expr__ctx_init(struct parse_ctx *ctx)
{
ctx->num_ids = 0;
}
static int
__expr__parse(double *val, struct parse_ctx *ctx, const char *expr,
int start)
{
YY_BUFFER_STATE buffer;
void *scanner;
int ret;
ret = expr_lex_init_extra(start, &scanner);
if (ret)
return ret;
buffer = expr__scan_string(expr, scanner);
#ifdef PARSER_DEBUG
expr_debug = 1;
#endif
ret = expr_parse(val, ctx, scanner);
expr__flush_buffer(buffer, scanner);
expr__delete_buffer(buffer, scanner);
expr_lex_destroy(scanner);
return ret;
}
int expr__parse(double *final_val, struct parse_ctx *ctx, const char **pp)
{
return __expr__parse(final_val, ctx, *pp, EXPR_PARSE);
}
static bool
already_seen(const char *val, const char *one, const char **other,
int num_other)
{
int i;
if (one && !strcasecmp(one, val))
return true;
for (i = 0; i < num_other; i++)
if (!strcasecmp(other[i], val))
return true;
return false;
}
int expr__find_other(const char *p, 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);
if (err)
return -1;
*other = malloc((ctx.num_ids + 1) * sizeof(char *));
if (!*other)
return -ENOMEM;
for (i = 0, j = 0; i < ctx.num_ids; i++) {
const char *str = ctx.ids[i].name;
if (already_seen(str, one, *other, j))
continue;
str = strdup(str);
if (!str)
goto out;
(*other)[j++] = str;
}
(*other)[j] = NULL;
out:
if (i != ctx.num_ids) {
while (--j)
free((char *) (*other)[i]);
free(*other);
err = -1;
}
*num_other = j;
return err;
}

2
tools/perf/util/expr.h
View File

@ -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);

114
tools/perf/util/expr.l Normal file
View File

@ -0,0 +1,114 @@
%option prefix="expr_"
%option reentrant
%option bison-bridge
%{
#include <linux/compiler.h>
#include "expr.h"
#include "expr-bison.h"
char *expr_get_text(yyscan_t yyscanner);
YYSTYPE *expr_get_lval(yyscan_t yyscanner);
static int __value(YYSTYPE *yylval, char *str, int base, int token)
{
u64 num;
errno = 0;
num = strtoull(str, NULL, base);
if (errno)
return EXPR_ERROR;
yylval->num = num;
return token;
}
static int value(yyscan_t scanner, int base)
{
YYSTYPE *yylval = expr_get_lval(scanner);
char *text = expr_get_text(scanner);
return __value(yylval, text, base, NUMBER);
}
/*
* Allow @ instead of / to be able to specify pmu/event/ without
* conflicts with normal division.
*/
static char *normalize(char *str)
{
char *ret = str;
char *dst = str;
while (*str) {
if (*str == '@')
*dst++ = '/';
else if (*str == '\\')
*dst++ = *++str;
else
*dst++ = *str;
str++;
}
*dst = 0x0;
return ret;
}
static int str(yyscan_t scanner, int token)
{
YYSTYPE *yylval = expr_get_lval(scanner);
char *text = expr_get_text(scanner);
yylval->str = normalize(strdup(text));
if (!yylval->str)
return EXPR_ERROR;
yylval->str = normalize(yylval->str);
return token;
}
%}
number [0-9]+
sch [-,=]
spec \\{sch}
sym [0-9a-zA-Z_\.:@]+
symbol {spec}*{sym}*{spec}*{sym}*
%%
{
int start_token;
start_token = parse_events_get_extra(yyscanner);
if (start_token) {
parse_events_set_extra(NULL, yyscanner);
return start_token;
}
}
max { return MAX; }
min { return MIN; }
if { return IF; }
else { return ELSE; }
#smt_on { return SMT_ON; }
{number} { return value(yyscanner, 10); }
{symbol} { return str(yyscanner, ID); }
"|" { return '|'; }
"^" { return '^'; }
"&" { return '&'; }
"-" { return '-'; }
"+" { return '+'; }
"*" { return '*'; }
"/" { return '/'; }
"%" { return '%'; }
"(" { return '('; }
")" { return ')'; }
"," { return ','; }
. { }
%%
int expr_wrap(void *scanner __maybe_unused)
{
return 1;
}

169
tools/perf/util/expr.y
View File

@ -1,5 +1,7 @@
/* Simple expression parser */
%{
#define YYDEBUG 1
#include <stdio.h>
#include "util.h"
#include "util/debug.h"
#include <stdlib.h> // strtod()
@ -8,23 +10,23 @@
#include "smt.h"
#include <string.h>
#define MAXIDLEN 256
%}
%define api.pure full
%parse-param { double *final_val }
%parse-param { struct parse_ctx *ctx }
%parse-param { const char **pp }
%lex-param { const char **pp }
%parse-param {void *scanner}
%lex-param {void* scanner}
%union {
double num;
char id[MAXIDLEN+1];
double num;
char *str;
}
%token EXPR_PARSE EXPR_OTHER EXPR_ERROR
%token <num> NUMBER
%token <id> ID
%token <str> ID
%token MIN MAX IF ELSE SMT_ON
%left MIN MAX IF
%left '|'
@ -36,11 +38,9 @@
%type <num> expr if_expr
%{
static int expr__lex(YYSTYPE *res, const char **pp);
static void expr__error(double *final_val __maybe_unused,
static void expr_error(double *final_val __maybe_unused,
struct parse_ctx *ctx __maybe_unused,
const char **pp __maybe_unused,
void *scanner,
const char *s)
{
pr_debug("%s\n", s);
@ -62,6 +62,27 @@ static int lookup_id(struct parse_ctx *ctx, char *id, double *val)
%}
%%
start:
EXPR_PARSE all_expr
|
EXPR_OTHER all_other
all_other: all_other other
|
other: ID
{
if (ctx->num_ids + 1 >= EXPR_MAX_OTHER) {
pr_err("failed: way too many variables");
YYABORT;
}
ctx->ids[ctx->num_ids++].name = $1;
}
|
MIN | MAX | IF | ELSE | SMT_ON | NUMBER | '|' | '^' | '&' | '-' | '+' | '*' | '/' | '%' | '(' | ')'
all_expr: if_expr { *final_val = $1; }
;
@ -92,131 +113,3 @@ expr: NUMBER
;
%%
static int expr__symbol(YYSTYPE *res, const char *p, const char **pp)
{
char *dst = res->id;
const char *s = p;
if (*p == '#')
*dst++ = *p++;
while (isalnum(*p) || *p == '_' || *p == '.' || *p == ':' || *p == '@' || *p == '\\') {
if (p - s >= MAXIDLEN)
return -1;
/*
* Allow @ instead of / to be able to specify pmu/event/ without
* conflicts with normal division.
*/
if (*p == '@')
*dst++ = '/';
else if (*p == '\\')
*dst++ = *++p;
else
*dst++ = *p;
p++;
}
*dst = 0;
*pp = p;
dst = res->id;
switch (dst[0]) {
case 'm':
if (!strcmp(dst, "min"))
return MIN;
if (!strcmp(dst, "max"))
return MAX;
break;
case 'i':
if (!strcmp(dst, "if"))
return IF;
break;
case 'e':
if (!strcmp(dst, "else"))
return ELSE;
break;
case '#':
if (!strcasecmp(dst, "#smt_on"))
return SMT_ON;
break;
}
return ID;
}
static int expr__lex(YYSTYPE *res, const char **pp)
{
int tok;
const char *s;
const char *p = *pp;
while (isspace(*p))
p++;
s = p;
switch (*p++) {
case '#':
case 'a' ... 'z':
case 'A' ... 'Z':
return expr__symbol(res, p - 1, pp);
case '0' ... '9': case '.':
res->num = strtod(s, (char **)&p);
tok = NUMBER;
break;
default:
tok = *s;
break;
}
*pp = p;
return tok;
}
static bool already_seen(const char *val, const char *one, const char **other,
int num_other)
{
int i;
if (one && !strcasecmp(one, val))
return true;
for (i = 0; i < num_other; i++)
if (!strcasecmp(other[i], val))
return true;
return false;
}
int expr__find_other(const char *p, const char *one, const char ***other,
int *num_otherp)
{
const char *orig = p;
int err = -1;
int num_other;
*other = malloc((EXPR_MAX_OTHER + 1) * sizeof(char *));
if (!*other)
return -1;
num_other = 0;
for (;;) {
YYSTYPE val;
int tok = expr__lex(&val, &p);
if (tok == 0) {
err = 0;
break;
}
if (tok == ID && !already_seen(val.id, one, *other, num_other)) {
if (num_other >= EXPR_MAX_OTHER - 1) {
pr_debug("Too many extra events in %s\n", orig);
break;
}
(*other)[num_other] = strdup(val.id);
if (!(*other)[num_other])
return -1;
num_other++;
}
}
(*other)[num_other] = NULL;
*num_otherp = num_other;
if (err) {
*num_otherp = 0;
free(*other);
*other = NULL;
}
return err;
}