StaticEXIOptions

[Anonymous]

There are a lot of static variables declared in StaticEXIOptions which are placed in RAM when compiling the code for an embedded system. Since RAM is limited in such systems, it would be a good idea to convert them to static constant variables, so that they are placed in ROM instead of RAM. I have already tried this, and saved about 8.5 kB of RAM.
Wahab

[Rumen Kyusakov]

Hi Wahab,

Thanks for your suggestion and feedback! StaticEXIOptions is the grammar describing the EXI header and making it constant is good idea in almost all scenarios.

Did you use the #define CONST macro i.e.,

#define CONST const

?

Please share if there were more tweaks required. I will then add it as a feature request in the tracker.

Best regards,
Rumen

[Anonymous]

I did use this macro first, but I received some errors during compilation. Two types of errors were encountered:
1. The first type of errors occured when trying to initialize non-constant members of structures with constants. Let's take EXIPSchema structure:

const struct EXIPSchema
{
    AllocList memList;
    UriTable uriTable;
    EXIGrammar docGrammar;
    SimpleTypeTable simpleTypeTable;
    SchemaGrammarTable grammarTable;
    Index staticGrCount;
    EnumTable enumTable;
};

As you can see its members are non-constant. And when I tried to initialize them with constant data types, I got errors. I solved these errors by casting consts to non-consts as follows:

EXIPSchema ops_schema =
{
    {NULL, NULL},
    {{sizeof(UriEntry), 5, 5}, (UriEntry*)ops_uriEntry, 5},
    {(GrammarRule*)ops_docGrammarRule, 100663296, 2},
    {{sizeof(SimpleType), 67, 67}, (SimpleType*)ops_simpleTypes,67},
    {{sizeof(EXIGrammar), 75, 75}, (EXIGrammar*)ops_grammarTable, 75},
    75,
    {{sizeof(EnumDefinition), 0, 0}, NULL, 0}
};

1. The second type of error occured, when the values of these constant variables were modified in some places in the code. After some hit-and-trial, I managed to remove those errors by declaring ops_schema, and ops_uri_entry as non-constant, and all other variables as constant.

[Rumen Kyusakov]

Great thanks for the detailed instructions!

This approach can be used for the auto-generated grammars when in schema-mode processing as well so very useful indeed,

I filed a feature request for that here:
http://sourceforge.net/p/exip/feature-requests/12/

Regards,
Rumen