Adding a global static instance of a class and having the constructor invoked on initialization

[Stephan Friedl]

I am writing a GCC plugin and am trying to add a global variable which is a class instance.  The class I am trying to create a global static variable from is:

class CTestClass
{
public :
    CTestClass()

    {
        std::cout << "Test Class Initialized." << std::endl;
    }
};



The key code snippet looks like this (with the appropriate type in declType):


tree globalDeclaration = build_decl( UNKNOWN_LOCATION, VAR_DECL, get_identifier( globalDecl.name().c_str() ), declType );

/* allocate static storage for this variable */
TREE_STATIC( globalDeclaration ) = 1;

/* static: internal linkage */
TREE_PUBLIC( globalDeclaration ) = 1;

DECL_EXTERNAL( globalDeclaration ) = 0;


layout_decl( globalDeclaration, false );
rest_of_decl_compilation( globalDeclaration, 1, 0 );


I have tried inserting this into a number of passes and though there do not appear to be any errors, I have not been able to get the constructor for the global to appear in the __static_initialization_and_destruction_0() function dumped using the -fdump-tree-gimple command line option.

What I am wondering is how the variables to be initialized in the  __static_initialization_and_destruction_0() function are identified and if it is possible to insert a global instance of a class such that it will automatically get initialized in the  __static_initialization_and_destruction_0() function -or- if I have to modify the  __static_initialization_and_destruction_0() function's gimple representation and inject the call to the constructor there.  I have poked through the source code for the cpp parser and nothing has leapt out at me as a possible code segment to follow as an example.

Any suggestions or pointers would be most appreciated.

Thanks,

Stephan