C++ (Cpp) fun_block Examples

Example #1

File: function.cpp Project: Artorios/rootkit.com

void FunctionContext::initialize()
{
 Function *fn = function();
 fn->attach_context(this);
 
 FBlock *fb = fun_block();
 if (fb->pstart) delete fb->pstart;  // may be previously defined!
 fb->pstart = 0;
 fb->nargs = 0;                      // crucial to clear this!

// and switch to the function compile context!
 Parser::set_function_code(true);

 // *change 1.2.9 This is now retired; this is called explicitly before main()
 // *fix 1.2.5 Ensure that any library initializations occur before a program is run!
 //if (fn->name()=="main") {
 //  Parser::code().compile(Expressions::function_call("_init_lib",NULL),DROP_VALUE);
 //}
}

Example #2

File: function.cpp Project: doniexun/UnderC

void FunctionContext::finalize()
{
    UCContext& code = Parser::code();
// if the last instruction was a trival RETURN jump, ignore it!
    int op = code.last_pi()->opcode;
    Label *ret_lbl = Parser::state.return_label();
    // cerr << "ret fun " << ret_lbl << std::endl;
    if (op == JMP && code.last_pi()->data == code.ip_offset()) {
        // cerr << "removing ret " << std::endl;
        ret_lbl->remove(code.last_pi());  // take out this JMP
        code.backspace();                 // skip back
        ret_lbl->here();                  // repatch all other instances of return jump
    } else if (ret_lbl && op == UNWIND) ret_lbl->here(-1);

    LocalContext::finalize();

// *fix 1.1.0 Finalizing the context often generates an UNWIND;
// ensure that all returns jump to it first!
    if (ret_lbl && code.last_pi()->opcode == UNWIND) ret_lbl->here(-1);

// appropriate RETx instruction
    code.emit_return(m_function->return_type());

    fun_block()->finalize(size());

    // and switch to back to the static compile context...
    Parser::set_function_code(false);

// update the module structure with our line number range
    int lstart, lend;
    function()->line_nos()->lookup_range(lstart,lend);
    if (lstart < 0 || lend < 0)
        lstart = 0;
    Module *pm = Module::current();
    if(pm) {
        pm->add_function(function(),lstart,lend);
        function()->line_nos()->module(pm->id());
    } else function()->line_nos()->module(0);
}