source: vbox/trunk/src/libs/xpcom18a4/xpcom/tests/SizeTest02.cpp@ 4837

// Test02.cpp

#include "nsIDOMNode.h"
#include "nsCOMPtr.h"
#include "nsString.h"

#ifdef __MWERKS__
        #pragma exceptions off
#endif

NS_DEF_PTR(nsIDOMNode);

        /*
                This test file compares the generated code size of similar functions between raw
                COM interface pointers (|AddRef|ing and |Release|ing by hand) and |nsCOMPtr|s.

                Function size results were determined by examining dissassembly of the generated code.
                mXXX is the size of the generated code on the Macintosh.  wXXX is the size on Windows.
                For these tests, all reasonable optimizations were enabled and exceptions were
                disabled (just as we build for release).

                The tests in this file explore more complicated functionality: assigning a pointer
                to be reference counted into a [raw, nsCOMPtr] object using |QueryInterface|;
                ensuring that it is |AddRef|ed and |Release|d appropriately; calling through the pointer
                to a function supplied by the underlying COM interface.  The tests in this file expand
                on the tests in "Test01.cpp" by adding |QueryInterface|.

                Windows:
                        raw01                                                                    52
                        nsCOMPtr                                                         63
                        raw                                                                              66
                        nsCOMPtr*                                                        68

                Macintosh:
                        nsCOMPtr                                                        120     (1.0000)
                        Raw01                                                                   128             (1.1429)        i.e., 14.29% bigger than nsCOMPtr
                        Raw00                                                                   144             (1.2000)
        */


void // nsresult
Test02_Raw00( nsISupports* aDOMNode, nsString* aResult )
                // m144, w66
        {
// -- the following code is assumed, but is commented out so we compare only
//               the relevent generated code

//              if ( !aDOMNode )
//                      return NS_ERROR_NULL_POINTER;

                nsIDOMNode* node = 0;
                nsresult status = aDOMNode->QueryInterface(NS_GET_IID(nsIDOMNode), (void**)&node);
                if ( NS_SUCCEEDED(status) )
                        {
                                node->GetNodeName(*aResult);
                        }

                NS_IF_RELEASE(node);

//              return status;
        }

void // nsresult
Test02_Raw01( nsISupports* aDOMNode, nsString* aResult )
                // m128, w52
        {
//              if ( !aDOMNode )
//                      return NS_ERROR_NULL_POINTER;

                nsIDOMNode* node;
                nsresult status = aDOMNode->QueryInterface(NS_GET_IID(nsIDOMNode), (void**)&node);
                if ( NS_SUCCEEDED(status) )
                        {
                                node->GetNodeName(*aResult);
                                NS_RELEASE(node);
                        }

//              return status;
        }

void // nsresult
Test02_nsCOMPtr( nsISupports* aDOMNode, nsString* aResult )
                // m120, w63/68
        {
                nsresult status;
                nsCOMPtr<nsIDOMNode> node = do_QueryInterface(aDOMNode, &status);
                
                if ( node )
                        node->GetNodeName(*aResult);

//              return status;
        }