src/mac/classic/morefile/Optimization.h

   1 /*
   2         File:           Optimization.h
   3
   4         Contains:       Defines that let you make MoreFiles code more efficient.
   5
   6         Version:        MoreFiles
   7
   8         Copyright:      © 1992-2001 by Apple Computer, Inc., all rights reserved.
   9
  10         You may incorporate this sample code into your applications without
  11         restriction, though the sample code has been provided "AS IS" and the
  12         responsibility for its operation is 100% yours.  However, what you are
  13         not permitted to do is to redistribute the source as "DSC Sample Code"
  14         after having made changes. If you're going to re-distribute the source,
  15         we require that you make it clear in the source that the code was
  16         descended from Apple Sample Code, but that you've made changes.
  17
  18         File Ownership:
  19
  20                 DRI:                            Apple Macintosh Developer Technical Support
  21
  22                 Other Contact:          Apple Macintosh Developer Technical Support
  23                                                         <http://developer.apple.com/bugreporter/>
  24
  25                 Technology:                     DTS Sample Code
  26
  27         Writers:
  28
  29                 (JL)    Jim Luther
  30
  31         Change History (most recent first):
  32
  33                  <1>      2/7/01        JL              first checked in
  34 */
  35
  36 /*
  37         The Optimization changes to MoreFiles source and header files, along with
  38         this file and OptimizationEnd.h, let you optimize the code produced
  39         by MoreFiles in several ways.
  40
  41         1 -- MoreFiles contains extra code so that many routines can run under
  42         Mac OS systems back to System 6. If your program requires a specific
  43         version of Mac OS and your program checks for that version before
  44         calling MoreFiles routines, then you can remove a lot of compatibility
  45         code by defining one of the following to 1:
  46
  47                 __MACOSSEVENFIVEONEORLATER      // assume Mac OS 7.5.1 or later
  48                 __MACOSSEVENFIVEORLATER         // assume Mac OS 7.5 or later
  49                 __MACOSSEVENORLATER                     // assume Mac OS 7.0 or later
  50
  51         If you're compiling 68K code, the default is to include all compatibility code.
  52         If you're compiling PowerPC code (TARGET_RT_MAC_CFM), the default is __MACOSSEVENORLATER
  53         If you're compiling for Carbon code (TARGET_API_MAC_CARBON), the default is __MACOSSEVENFIVEONEORLATER
  54
  55         2 -- You may disable Pascal calling conventions in all MoreFiles routines
  56         except for system callbacks that require Pascal calling conventions.
  57         This will make 68K C programs both smaller and faster.
  58         (PowerPC compilers ignore pascal calling conventions.)
  59         Just define __WANTPASCALELIMINATION to be 1 to turn this optimization on
  60         when building MoreFiles for use from C programs (you'll need to keep
  61         Pascal calling conventions when linking MoreFiles routines with Pascal
  62         programs).
  63
  64         3 -- If Metrowerks compiler is used, "#pragma internal on" may help produce
  65         better code. However, this option can also cause problems if you're
  66         trying to build MoreFiles as a shared library, so it is by default not used.
  67         Just define __USEPRAGMAINTERNAL to be 1 to turn this optimization on.
  68
  69         Original changes supplied by Fabrizio Oddone
  70 */
  71
  72 #include <ConditionalMacros.h>
  73
  74 // if we're compiling for Carbon, then we're running on Mac OS 8.1 or later
  75 #ifndef __MACOSSEVENFIVEONEORLATER
  76         #define __MACOSSEVENFIVEONEORLATER TARGET_API_MAC_CARBON
  77 #endif
  78
  79 #ifndef __MACOSSEVENFIVEORLATER
  80         #define __MACOSSEVENFIVEORLATER __MACOSSEVENFIVEONEORLATER
  81 #endif
  82
  83 #ifndef __MACOSSEVENORLATER
  84         #if TARGET_RT_MAC_CFM
  85                 #define __MACOSSEVENORLATER 1
  86         #else
  87                 #define __MACOSSEVENORLATER __MACOSSEVENFIVEORLATER
  88         #endif
  89 #endif
  90
  91
  92 #ifndef __WANTPASCALELIMINATION
  93         #define __WANTPASCALELIMINATION 0
  94 #endif
  95
  96 #if     __WANTPASCALELIMINATION
  97         #define pascal
  98 #endif
  99
 100
 101 #ifndef __USEPRAGMAINTERNAL
 102         #define __USEPRAGMAINTERNAL     0
 103 #endif
 104
 105 #if     __USEPRAGMAINTERNAL
 106         #if defined(__MWERKS__)
 107                 #pragma internal on
 108         #endif
 109 #endif