xpcom/tests/SizeTest02.cpp

   1 // Test02.cpp
   2
   3 #include "nsINode.h"
   4 #include "nsCOMPtr.h"
   5 #include "nsString.h"
   6
   7 NS_DEF_PTR(nsINode);
   8
   9 /*
  10         This test file compares the generated code size of similar functions
  11    between raw COM interface pointers (|AddRef|ing and |Release|ing by hand) and
  12    |nsCOMPtr|s.
  13
  14         Function size results were determined by examining dissassembly of the
  15    generated code. mXXX is the size of the generated code on the Macintosh. wXXX
  16    is the size on Windows. For these tests, all reasonable optimizations were
  17    enabled and exceptions were disabled (just as we build for release).
  18
  19         The tests in this file explore more complicated functionality: assigning
  20    a pointer to be reference counted into a [raw, nsCOMPtr] object using
  21    |QueryInterface|; ensuring that it is |AddRef|ed and |Release|d
  22    appropriately; calling through the pointer to a function supplied by the
  23    underlying COM interface.  The tests in this file expand on the tests in
  24    "Test01.cpp" by adding |QueryInterface|.
  25
  26         Windows:
  27                 raw01
  28    52 nsCOMPtr                                                   63 raw
  29    66 nsCOMPtr*                                                  68
  30
  31         Macintosh:
  32                 nsCOMPtr 120    (1.0000) Raw01
  33    128          (1.1429)        i.e., 14.29% bigger than nsCOMPtr Raw00
  34    144          (1.2000)
  35 */
  36
  37 void  // nsresult
  38 Test02_Raw00(nsISupports* aDOMNode, nsString* aResult)
  39 // m144, w66
  40 {
  41   // -- the following code is assumed, but is commented out so we compare only
  42   //             the relevent generated code
  43
  44   //            if ( !aDOMNode )
  45   //                    return NS_ERROR_NULL_POINTER;
  46
  47   nsINode* node = 0;
  48   nsresult status =
  49       aDOMNode->QueryInterface(NS_GET_IID(nsINode), (void**)&node);
  50   if (NS_SUCCEEDED(status)) {
  51     node->GetNodeName(*aResult);
  52   }
  53
  54   NS_IF_RELEASE(node);
  55
  56   //            return status;
  57 }
  58
  59 void  // nsresult
  60 Test02_Raw01(nsISupports* aDOMNode, nsString* aResult)
  61 // m128, w52
  62 {
  63   //            if ( !aDOMNode )
  64   //                    return NS_ERROR_NULL_POINTER;
  65
  66   nsINode* node;
  67   nsresult status =
  68       aDOMNode->QueryInterface(NS_GET_IID(nsINode), (void**)&node);
  69   if (NS_SUCCEEDED(status)) {
  70     node->GetNodeName(*aResult);
  71     NS_RELEASE(node);
  72   }
  73
  74   //            return status;
  75 }
  76
  77 void  // nsresult
  78 Test02_nsCOMPtr(nsISupports* aDOMNode, nsString* aResult)
  79 // m120, w63/68
  80 {
  81   nsresult status;
  82   nsCOMPtr<nsINode> node = do_QueryInterface(aDOMNode, &status);
  83
  84   if (node) node->GetNodeName(*aResult);
  85
  86   //            return status;
  87 }