linux/tools/perf/util/expr.h

#ifndef PARSE_CTX_H
#define PARSE_CTX_H 1

#define EXPR_MAX_OTHER 15
#define MAX_PARSE_ID EXPR_MAX_OTHER

struct parse_id {
	const char *name;
	double val;
};

struct parse_ctx {
	int num_ids;
	struct parse_id ids[MAX_PARSE_ID];
};

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);

#endif
perf tools: Add a simple expression parser for JSON Add a simple expression parser good enough to parse JSON relation expressions. The parser is implemented using bison. This is just intended as an simple parser for internal usage in the event lists, not the beginning of a "perf scripting language" v2: Use expr__ prefix instead of expr_ Support multiple free variables for parser Committer note: The v2 patch had: %define api.pure full In expr.y, that is a feature introduced in bison 2.7, to have reentrant parsers, not using global variables, which would make tools/perf stop building with the bison version shipped in older distros, so Andi realised that the other parsers (e.g. parse-events.y) were using: %pure-parser Which is present in older versions of bison and fits the bill. I added: CFLAGS_expr-bison.o += -DYYENABLE_NLS=0 -DYYLTYPE_IS_TRIVIAL=0 -w To finally make it build, copying what was there for pmu-bison.o, another parser. Signed-off-by: Andi Kleen <ak@linux.intel.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Link: http://lkml.kernel.org/r/20170320201711.14142-8-andi@firstfloor.org [ stdlib.h is needed in tests/expr.c for free() fixing build in systems such as ubuntu:16.04-x-s390 ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> 2017-03-20 20:17:05 +00:00			`#ifndef PARSE_CTX_H`
			`#define PARSE_CTX_H 1`

perf tools: Increase maximum number of events in expressions Some of the upcoming metrics need more than 8 events. Increase the maximum number the parser supports. Signed-off-by: Andi Kleen <ak@linux.intel.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Link: http://lkml.kernel.org/r/20170811232634.30465-9-andi@firstfloor.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> 2017-08-11 23:26:24 +00:00			`#define EXPR_MAX_OTHER 15`
perf tools: Add a simple expression parser for JSON Add a simple expression parser good enough to parse JSON relation expressions. The parser is implemented using bison. This is just intended as an simple parser for internal usage in the event lists, not the beginning of a "perf scripting language" v2: Use expr__ prefix instead of expr_ Support multiple free variables for parser Committer note: The v2 patch had: %define api.pure full In expr.y, that is a feature introduced in bison 2.7, to have reentrant parsers, not using global variables, which would make tools/perf stop building with the bison version shipped in older distros, so Andi realised that the other parsers (e.g. parse-events.y) were using: %pure-parser Which is present in older versions of bison and fits the bill. I added: CFLAGS_expr-bison.o += -DYYENABLE_NLS=0 -DYYLTYPE_IS_TRIVIAL=0 -w To finally make it build, copying what was there for pmu-bison.o, another parser. Signed-off-by: Andi Kleen <ak@linux.intel.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Link: http://lkml.kernel.org/r/20170320201711.14142-8-andi@firstfloor.org [ stdlib.h is needed in tests/expr.c for free() fixing build in systems such as ubuntu:16.04-x-s390 ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> 2017-03-20 20:17:05 +00:00			`#define MAX_PARSE_ID EXPR_MAX_OTHER`

			`struct parse_id {`
			`const char *name;`
			`double val;`
			`};`

			`struct parse_ctx {`
			`int num_ids;`
			`struct parse_id ids[MAX_PARSE_ID];`
			`};`

			`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);`

			`#endif`