If a numeric value is encountered between < >, it represents the integer type
size used to hold the enumeration, in bits.
-enum <integer_type OR size> name {
+enum name <integer_type OR size> {
string = start_value1 ... end_value1,
"other string" = start_value2 ... end_value2,
yet_another_string, /* will be assigned to end_value2 + 1 */
If the values are omitted, the enumeration starts at 0 and increment of 1 for
each entry:
-enum <32> name {
+enum name <32> {
ZERO,
ONE,
TWO,
uint8_t stream_packet_count_bits; /* Significant counter bits */
uint8_t compression_scheme;
uint8_t encryption_scheme;
- uint8_t checksum;
+ uint8_t checksum_scheme;
};
6.1 Lexical Scope
-The lexical scope of each structure (stream packet context, header, stream event
-context, event context and payload) is extended in the following way: lower
-levels (e.g. 3) can refer to fields defined in prior levels (e.g. 2 and 1). The
-field in the closest level has priority in case of field name conflict.
+For variant tag definition only, the lexical scope of each structure (stream
+packet context, header, stream event context, event context and payload) is
+extended in the following way: lower levels (e.g. 3) can refer to fields defined
+in prior levels (e.g. 2 and 1). The field in the closest level has priority in
+case of field name conflict.
This allows, for instance, the event context to define a variant refering to the
"id" field of the event header as selector.
well as within "//" and end of line, are treated as comments. Boolean values can
be represented as true, TRUE, or 1 for true, and false, FALSE, or 0 for false.
+Each of "trace", "stream", "event", "struct" and "variant" have their own
+nestable declaration scope, within which types can be declared using "typedef"
+and "typealias". An innermost declaration scope can refer to type declared
+within its container lexical scope prior to the innermost declaration scope.
+
The grammar representing the CTF metadata is presented in
Appendix C. CTF Metadata Grammar.
...
};
-enum <integer_type or size> name {
+enum name <integer_type or size> {
...
};
string
struct
trace
+typealias
typedef
unsigned
variant
unary-operator: one of
+ -
-assignment-expression:
- unary-expression assignment-operator unary-expression
-
assignment-operator:
=
2.2) Declarations:
declaration:
- declaration-specifiers declarator-list-opt ;
+ declaration-specifiers ;
+ declaration-specifiers storage-class-specifier declaration-specifiers declarator-list ;
ctf-specifier ;
declaration-specifiers:
- storage-class-specifier declaration-specifiers-opt
type-specifier declaration-specifiers-opt
type-qualifier declaration-specifiers-opt
declarator
declarator-list , declarator
+abstract-declarator-list:
+ abstract-declarator
+ abstract-declarator-list , abstract-declarator
+
storage-class-specifier:
typedef
unsigned
_Bool
_Complex
- struct-or-variant-specifier
+ struct-specifier
+ variant-specifier
enum-specifier
typedef-name
ctf-type-specifier
struct-specifier:
- struct identifier-opt { struct-or-variant-declaration-list }
+ struct identifier-opt { struct-or-variant-declaration-list-opt }
struct identifier
struct-or-variant-declaration-list:
struct-or-variant-declaration:
specifier-qualifier-list struct-or-variant-declarator-list ;
+ declaration-specifiers storage-class-specifier declaration-specifiers declarator-list ;
+ typealias declaration-specifiers abstract-declarator-list : declaration-specifiers abstract-declarator-list ;
+ typealias declaration-specifiers abstract-declarator-list : declarator-list ;
specifier-qualifier-list:
type-specifier specifier-qualifier-list-opt
direct-declarator [ type-specifier ]
direct-declarator [ constant-expression ]
+abstract-declarator:
+ pointer-opt direct-abstract-declarator
+
+direct-abstract-declarator:
+ identifier-opt
+ ( abstract-declarator )
+ direct-abstract-declarator [ type-specifier ]
+ direct-abstract-declarator [ constant-expression ]
+ direct-abstract-declarator [ ]
+
pointer:
- type-qualifier-list-opt
- type-qualifier-list-opt pointer
+ * type-qualifier-list-opt
+ * type-qualifier-list-opt pointer
type-qualifier-list:
type-qualifier
type-qualifier-list type-qualifier
-identifier-list:
- identifier
- identifier-list , identifier
-
typedef-name:
identifier
event { ctf-assignment-expression-list-opt }
stream { ctf-assignment-expression-list-opt }
trace { ctf-assignment-expression-list-opt }
+ typealias declaration-specifiers abstract-declarator-list : declaration-specifiers abstract-declarator-list ;
+ typealias declaration-specifiers abstract-declarator-list : declarator-list ;
ctf-type-specifier:
floating_point { ctf-assignment-expression-list-opt }
ctf-assignment-expression:
unary-expression assignment-operator unary-expression
unary-expression type-assignment-operator type-specifier
+ declaration-specifiers storage-class-specifier declaration-specifiers declarator-list
+ typealias declaration-specifiers abstract-declarator-list : declaration-specifiers abstract-declarator-list
+ typealias declaration-specifiers abstract-declarator-list : declarator-list