Add `lttng_bytecode_interpret_format_output()` for top of stack extraction

[deliverable/lttng-ust.git] / liblttng-ust / lttng-filter.h

diff --git a/liblttng-ust/lttng-filter.h b/liblttng-ust/lttng-filter.h
index bf553cea22427b373dac9264c0ab525ee3f4e04f..61bc213bf29472093eb89090d54e3f3586463ac0 100644 (file)
--- a/liblttng-ust/lttng-filter.h
+++ b/liblttng-ust/lttng-filter.h
@@ -128,6 +128,13 @@ struct filter_get_index_data {
        uint64_t offset;        /* in bytes */
        size_t ctx_index;
        size_t array_len;
+       /*
+        * Field is only populated for LOAD_ROOT_CONTEXT, LOAD_ROOT_APP_CONTEXT
+        * and LOAD_ROOT_PAYLOAD. Left NULL for LOAD_OBJECT, considering that the
+        * interpreter needs to find it from the event fields and types to
+        * support variants.
+        */
+       const struct lttng_event_field *field;
        struct {
                size_t len;
                enum object_type type;
@@ -208,6 +215,7 @@ struct load_ptr {
        enum load_type type;
        enum object_type object_type;
        const void *ptr;
+       size_t nr_elem;
        bool rev_bo;
        /* Temporary place-holders for contexts. */
        union {
@@ -215,10 +223,6 @@ struct load_ptr {
                uint64_t u64;
                double d;
        } u;
-       /*
-        * "field" is only needed when nested under a variant, in which
-        * case we cannot specialize the nested operations.
-        */
        const struct lttng_event_field *field;
 };
 
@@ -289,13 +293,49 @@ struct estack {
                (top)--;                                        \
        } while (0)
 
+enum lttng_interpreter_type {
+       LTTNG_INTERPRETER_TYPE_S64,
+       LTTNG_INTERPRETER_TYPE_U64,
+       LTTNG_INTERPRETER_TYPE_SIGNED_ENUM,
+       LTTNG_INTERPRETER_TYPE_UNSIGNED_ENUM,
+       LTTNG_INTERPRETER_TYPE_DOUBLE,
+       LTTNG_INTERPRETER_TYPE_STRING,
+       LTTNG_INTERPRETER_TYPE_SEQUENCE,
+};
+
+/*
+ * Represents the output parameter of the lttng interpreter.
+ * Currently capturable field classes are integer, double, string and sequence
+ * of integer.
+ */
+struct lttng_interpreter_output {
+       enum lttng_interpreter_type type;
+       union {
+               int64_t s;
+               uint64_t u;
+               double d;
+
+               struct {
+                       const char *str;
+                       size_t len;
+               } str;
+               struct {
+                       const void *ptr;
+                       size_t nr_elem;
+
+                       /* Inner type. */
+                       const struct lttng_type *nested_type;
+               } sequence;
+       } u;
+};
+
 const char *print_op(enum filter_op op);
 
 int lttng_filter_validate_bytecode(struct bytecode_runtime *bytecode);
 int lttng_filter_specialize_bytecode(const struct lttng_event_desc *event_desc,
                struct bytecode_runtime *bytecode);
 
-uint64_t lttng_filter_false(void *filter_data,
+uint64_t lttng_filter_interpret_bytecode_false(void *filter_data,
                const char *filter_stack_data);
 uint64_t lttng_filter_interpret_bytecode(void *filter_data,
                const char *filter_stack_data);