LTTng » Babeltrace

Using Babeltrace 1.2.0, it looks like the parser does not allow something else than an identifier to be used as a variant tag.

Metadata that passes:

/* CTF 1.8 */

trace {
    major = 1;
    minor = 8;
    byte_order = le;
};

event {
    name = "file";
    fields := struct {
        enum : integer { size = 8; } {
            TEN = 10,
        } choice;

        variant <choice> {
            integer {
                size = 32;
            } TEN;
        } var;
    };
};

Stream:

abc

Metadata that fails, but should pass:

/* CTF 1.8 */

trace {
    major = 1;
    minor = 8;
    byte_order = le;
};

event {
    name = "file";
    fields := struct {
        enum : integer { size = 8; } {
            TEN = 10,
        } choice;

        variant <event.fields.choice> {
            integer {
                size = 32;
            } TEN;
        } var;
    };
};

Babeltrace output:

[error] at line 16: token "event": syntax error, unexpected EVENT, expecting IDENTIFIER or ID_TYPE

[error] Error creating AST
[warning] Unable to open trace metadata for path ".".
[warning] [Context] Cannot open_trace of format ctf at path ..
[warning] [Context] cannot open trace "." from . for reading.
[error] Cannot open any trace for reading.

[error] opening trace "." for reading.

[error] none of the specified trace paths could be opened.

Other metadata that fails, but should pass:

/* CTF 1.8 */

trace {
    major = 1;
    minor = 8;
    byte_order = le;
};

event {
    name = "file";
    fields := struct {
        struct {
            enum : integer { size = 8; } {
                TEN = 10,
            } choice;
        } structure;

        variant <structure.choice> {
            integer {
                size = 32;
            } TEN;
        } var;
    };
};

Babeltrace output (error is different):

[error] at line 18: token ".": syntax error, unexpected DOT, expecting GT

[error] Error creating AST
[warning] Unable to open trace metadata for path ".".
[warning] [Context] Cannot open_trace of format ctf at path ..
[warning] [Context] cannot open trace "." from . for reading.
[error] Cannot open any trace for reading.

[error] opening trace "." for reading.

[error] none of the specified trace paths could be opened.