xpcom/tests/SizeTest02.cpp

   1 // Test02.cpp
   2
   3 #include "nsIDOMNode.h"
   4 #include "nsCOMPtr.h"
   5 #include "nsString.h"
   6
   7 NS_DEF_PTR(nsIDOMNode);
   8
   9         /*
  10                 This test file compares the generated code size of similar functions between raw
  11                 COM interface pointers (|AddRef|ing and |Release|ing by hand) and |nsCOMPtr|s.
  12
  13                 Function size results were determined by examining dissassembly of the generated code.
  14                 mXXX is the size of the generated code on the Macintosh.  wXXX is the size on Windows.
  15                 For these tests, all reasonable optimizations were enabled and exceptions were
  16                 disabled (just as we build for release).
  17
  18                 The tests in this file explore more complicated functionality: assigning a pointer
  19                 to be reference counted into a [raw, nsCOMPtr] object using |QueryInterface|;
  20                 ensuring that it is |AddRef|ed and |Release|d appropriately; calling through the pointer
  21                 to a function supplied by the underlying COM interface.  The tests in this file expand
  22                 on the tests in "Test01.cpp" by adding |QueryInterface|.
  23
  24                 Windows:
  25                         raw01                                                                    52
  26                         nsCOMPtr                                                         63
  27                         raw                                                                              66
  28                         nsCOMPtr*                                                        68
  29
  30                 Macintosh:
  31                         nsCOMPtr                                                        120     (1.0000)
  32                         Raw01                                                                   128             (1.1429)        i.e., 14.29% bigger than nsCOMPtr
  33                         Raw00                                                                   144             (1.2000)
  34         */
  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                 nsIDOMNode* node = 0;
  48                 nsresult status = aDOMNode->QueryInterface(NS_GET_IID(nsIDOMNode), (void**)&node);
  49                 if ( NS_SUCCEEDED(status) )
  50                         {
  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                 nsIDOMNode* node;
  67                 nsresult status = aDOMNode->QueryInterface(NS_GET_IID(nsIDOMNode), (void**)&node);
  68                 if ( NS_SUCCEEDED(status) )
  69                         {
  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<nsIDOMNode> node = do_QueryInterface(aDOMNode, &status);
  83
  84                 if ( node )
  85                         node->GetNodeName(*aResult);
  86
  87 //              return status;
  88         }
  89