We need a way to add custom types before start parsing

[mingodad]

Trying to parse sqlite3.c (after preprocessing it) I'm getting this erro:

./xocfe.exe sqlite3.pp.c -dump sqlite3.c.dump


error(11):meet '__builtin_va_list', illegal qualifier of declaration
error(11):meet '__gnuc_va_list', expected ';' after declaration

sqlite3.pp.c - (2) error(s), (0) warnging(s)

Other parsers usually have a function to add custom types before start parsing (see https://github.com/afborchert/astl-c/blob/27e8ed50fdd0336e3d9bd9cd58b50959723ab2bd/astl-c/run.cpp#L73, https://github.com/edubart/lpegrex/blob/89dc4fe918048eb881c5784ddedd22527cbff144/parsers/c11.lua#L622, https://github.com/pmer/pcc/blob/bfb7db646de6b28524b86d492c32f37970e9374e/cc/cxxcom/main.c#L290) this way it's possible to at least parse the C source file.

[stevenknown]

Yes, the feature should be added.

[mingodad]

I just tested it again and can parse sqlite3.c (after preprocessing it), I've been looking through the code and it seems that we need to use Decl * Scope::addToUserTypeList(Decl * decl) to create __builtin_va_list as user defined type but I'm not sure how to proceed.
Maybe create a high level method like Decl * Scope::addToUserType(const char* utype_name).

[stevenknown]

I was a little late with my reply ;)

Scope::addToUserTypeList(Decl * decl) is used to add C language user's typedef type, such as
typedef struct { ... } UserStruct;

If you are going to add some builtin functions, just like '__builtin_va_list', it is actually can be treated as keyword,
and the keyword can be recognized and recorded by FrontEnd's parser, in order to avoid parser complaining error
when parser can not find any of its definition and declaration.

After parsing, the AST generated, then tree2ir.cpp will build an XOC call ir to corresponding to the builtin function '__builtin_va_list'.

And after all XOC passes finished, __builtin_va_list will be transformed to pointer arith operation, you can search the macro 'VARIADIC_PARAMETER_ACCESS' 
in XOC project to check the detail of how to process 'va_list' series functions.

I am looking forward to your help to improve the feature.