VM Maker: MemoryAccess-dtl.5.mcz

 
David T. Lewis uploaded a new version of MemoryAccess to project VM Maker:
http://source.squeak.org/VMMaker/MemoryAccess-dtl.5.mcz

==================== Summary ====================

Name: MemoryAccess-dtl.5
Author: dtl
Time: 22 March 2013, 7:19:08.002 pm
UUID: 95c752da-f58d-43df-a9cc-9ebe7b2efd92
Ancestors: MemoryAccess-dtl.4

Move MemoryAccess under VMClass rather than object because it needs requiredMethodNames.

=============== Diff against MemoryAccess-dtl.4 ===============

Item was changed:
+ VMClass subclass: #MemoryAccess
- Object subclass: #MemoryAccess
  instanceVariableNames: ''
  classVariableNames: 'Enabled'
  poolDictionaries: ''
  category: 'MemoryAccess'!
 
+ !MemoryAccess commentStamp: 'dtl 3/21/2013 23:50' prior: 0!
+ MemoryAccess defines the low level mapping of object memory addresses to the underlying machine address space. When implemented as Smalltalk methods, the generated C code is available for debugging and profiling. The Squeak code generator inlines the methods such that the resulting VM will have performance very similar to that obtained with traditional C preprocessor macros or inlined static functions.
- !MemoryAccess commentStamp: 'dtl 4/5/2009 14:38' prior: 0!
- MemoryAccess defines the low level mapping of object memory addresses to the underlying machine address space. When implemented as Smalltalk methods, the generated C code
- is available for debugging and profiling. The Squeak code generator inlines the methods
- such that the resulting VM will have performance very similar to that obtained with
- traditional C preprocessor macros or inlined static functions.
 
+ Methods are categorized and commented in order to clarify the type casting and memory address translation.
- Methods are categorized and commented in order to clarify the type casting and memory
- address translation.
 
  MemoryAccess replaces the traditional external definitions in sqMemoryAccess.h:
 
  #ifdef USE_INLINE_MEMORY_ACCESSORS
    /* Use static inline functions when the compiler produces efficient code for small accessors.
       These are preferred because static type checking will prevent inadvertent confusion of pointers and oops. */
    static inline sqInt byteAtPointer(char *ptr) { return (sqInt)(*((unsigned char *)ptr)); }
    static inline sqInt byteAtPointerput(char *ptr, int val) { return (sqInt)(*((unsigned char *)ptr)= (unsigned char)val); }
    static inline sqInt shortAtPointer(char *ptr) { return (sqInt)(*((short *)ptr)); }
    static inline sqInt shortAtPointerput(char *ptr, int val) { return (sqInt)(*((short *)ptr)= (short)val); }
    static inline sqInt intAtPointer(char *ptr) { return (sqInt)(*((unsigned int *)ptr)); }
    static inline sqInt intAtPointerput(char *ptr, int val) { return (sqInt)(*((unsigned int *)ptr)= (int)val); }
    static inline sqInt longAtPointer(char *ptr) { return (sqInt)(*((sqInt *)ptr)); }
    static inline sqInt longAtPointerput(char *ptr, sqInt val) { return (sqInt)(*((sqInt *)ptr)= (sqInt)val); }
    static inline sqInt oopAtPointer(char *ptr) { return (sqInt)(*((sqInt *)ptr)); }
    static inline sqInt oopAtPointerput(char *ptr, sqInt val) { return (sqInt)(*((sqInt *)ptr)= (sqInt)val); }
    static inline char *pointerForOop(usqInt oop) { return sqMemoryBase + oop; }
    static inline sqInt oopForPointer(char *ptr) { return (sqInt)(ptr - sqMemoryBase); }
    static inline sqInt byteAt(sqInt oop) { return byteAtPointer(pointerForOop(oop)); }
    static inline sqInt byteAtput(sqInt oop, int val) { return byteAtPointerput(pointerForOop(oop), val); }
    static inline sqInt shortAt(sqInt oop) { return shortAtPointer(pointerForOop(oop)); }
    static inline sqInt shortAtput(sqInt oop, int val) { return shortAtPointerput(pointerForOop(oop), val); }
    static inline sqInt intAt(sqInt oop) { return intAtPointer(pointerForOop(oop)); }
    static inline sqInt intAtput(sqInt oop, int val) { return intAtPointerput(pointerForOop(oop), val); }
    static inline sqInt longAt(sqInt oop) { return longAtPointer(pointerForOop(oop)); }
    static inline sqInt longAtput(sqInt oop, sqInt val) { return longAtPointerput(pointerForOop(oop), val); }
    static inline sqInt oopAt(sqInt oop) { return oopAtPointer(pointerForOop(oop)); }
    static inline sqInt oopAtput(sqInt oop, sqInt val) { return oopAtPointerput(pointerForOop(oop), val); }
  #else
    /* Use macros when static inline functions aren't efficient. */
  # define byteAtPointer(ptr) ((sqInt)(*((unsigned char *)(ptr))))
  # define byteAtPointerput(ptr, val) ((sqInt)(*((unsigned char *)(ptr))= (unsigned char)(val)))
  # define shortAtPointer(ptr) ((sqInt)(*((short *)(ptr))))
  # define shortAtPointerput(ptr, val) ((sqInt)(*((short *)(ptr))= (short)(val)))
  # define intAtPointer(ptr) ((sqInt)(*((unsigned int *)(ptr))))
  # define intAtPointerput(ptr, val) ((sqInt)(*((unsigned int *)(ptr))= (int)(val)))
  # define longAtPointer(ptr) ((sqInt)(*((sqInt *)(ptr))))
  # define longAtPointerput(ptr, val) ((sqInt)(*((sqInt *)(ptr))= (sqInt)(val)))
  # define oopAtPointer(ptr) (sqInt)(*((sqInt *)ptr))
  # define oopAtPointerput(ptr, val) (sqInt)(*((sqInt *)ptr)= (sqInt)val)
  # define pointerForOop(oop) ((char *)(sqMemoryBase + ((usqInt)(oop))))
  # define oopForPointer(ptr) ((sqInt)(((char *)(ptr)) - (sqMemoryBase)))
  # define byteAt(oop) byteAtPointer(pointerForOop(oop))
  # define byteAtput(oop, val) byteAtPointerput(pointerForOop(oop), (val))
  # define shortAt(oop) shortAtPointer(pointerForOop(oop))
  # define shortAtput(oop, val) shortAtPointerput(pointerForOop(oop), (val))
  # define longAt(oop) longAtPointer(pointerForOop(oop))
  # define longAtput(oop, val) longAtPointerput(pointerForOop(oop), (val))
  # define intAt(oop) intAtPointer(pointerForOop(oop))
  # define intAtput(oop, val) intAtPointerput(pointerForOop(oop), (val))
  # define oopAt(oop) oopAtPointer(pointerForOop(oop))
  # define oopAtput(oop, val) oopAtPointerput(pointerForOop(oop), (val))
  #endif
 
  !