"

 COPYRIGHT (c) 1989 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

ArrayedCollection variableSubclass:#Array

	 instanceVariableNames:''

	 classVariableNames:''

	 poolDictionaries:''

	 category:'Collections-Arrayed'

!

!Array class methodsFor:'documentation'!

documentation

"

    Instances of Array store general objects; the arrays size is fixed, 

    therefore add:/remove: are not allowed. 

    (actually, #add: is implemented for compatibility with smalltalks which 

     provide it, but it outputs an annoying warning message ...)

    Access to the individual elements is via an integer index. 

    Since Arrays are used very often in the system, some methods have been tuned by

    reimplementing them as primitives.

    Notice that Array is a built-in class (i.e. the VM knows about its

    representation). Therefore it is NOT possible to add named instance 

    variables or change its inheritance. Subclassing is allowed - of course.

    Literal arrays (i.e. array-constants) are entered in source as:

	#( element1 element2 ... element-n)

    where each element must be itself a constant. In addition, true, false and nil

    are also allowed as array-literal.

    Examples:

	#(1 2 3)               

	#('foo' 2 (1 2) 4)     

	#('foo' #(1 2))        

	#('foo' nil true #true)

	#('one' two [3 3 3] (4 4 4))

"

!

copyright

"

 COPYRIGHT (c) 1989 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

!

version

! !

!Array class methodsFor:'instance creation'!

basicNew:anInteger

    "return an instance of myself with anInteger indexed variables.

     Since Array-creation is so common (all other collections use them),

     it seems worth to have a specially tuned version here."

%{  /* NOCONTEXT */

    OBJ newobj;

    unsigned INT instsize, nInstVars;

    INT nindexedinstvars;

    REGISTER OBJ *op;

    if (__isSmallInteger(anInteger)) {

	nindexedinstvars = _intVal(anInteger);

	if (nindexedinstvars >= 0) {

	    nInstVars = _intVal(_ClassInstPtr(self)->c_ninstvars);

	    nInstVars += nindexedinstvars;

	    instsize = OHDR_SIZE + __OBJS2BYTES__(nInstVars);

	    if (_CanDoQuickAlignedNew(instsize)) {

		/*

		 * the most common case

		 */

		_qCheckedAlignedNew(newobj, instsize);

	ok: ;

		_InstPtr(newobj)->o_class = self;

		__qSTORE(newobj, self);

#if defined(FAST_ARRAY_MEMSET4)

		memset4(_InstPtr(newobj)->i_instvars, nil, nInstVars);

#else

# if !defined(NEGATIVE_ADDRESSES)

		/*

		 * knowing that nil is 0

		 */

#ifdef XXmips

# undef FAST_ARRAY_MEMSET_DOUBLES_UNROLLED

# undef FAST_ARRAY_MEMSET_LONGLONG_UNROLLED

/* seems to be slightly faster */

# define FAST_ARRAY_MEMSET

#endif

#ifdef sparc

# define FAST_ARRAY_MEMSET_DOUBLES_UNROLLED

#endif

#  if defined(FAST_ARRAY_MEMSET_DOUBLES_UNROLLED)

		op = _InstPtr(newobj)->i_instvars;

		if (nInstVars > 8) {

		    *op++ = nil;    /* for alignment */

		    nInstVars--;

		    while (nInstVars >= 8) {

			*(double *)op = 0.0;

			((double *)op)[1] = 0.0;

			((double *)op)[2] = 0.0;

			((double *)op)[3] = 0.0;

			op += 8;

			nInstVars -= 8;

		    }

		}

		while (nInstVars) {

		    *op++ = 0;

		    nInstVars--;

		}

#  else

#   if defined(FAST_ARRAY_MEMSET_LONGLONG_UNROLLED)

		op = _InstPtr(newobj)->i_instvars;

		if (nInstVars > 8) {

		    *op++ = nil;    /* for alignment */

		    nInstVars--;

		    while (nInstVars >= 8) {

			*(long long *)op = 0;

			((long long *)op)[1] = 0;

			((long long *)op)[2] = 0;

			((long long *)op)[3] = 0;

			op += 8;

			nInstVars -= 8;

		    }

		}

		while (nInstVars) {

		    *op++ = 0;

		    nInstVars--;

		}

#   else

#    if defined(FAST_ARRAY_MEMSET)

		memset(_InstPtr(newobj)->i_instvars, 0, instsize - OHDR_SIZE);

#    else

		op = _InstPtr(newobj)->i_instvars;

		while (nInstVars--)

		    *op++ = nil;

#    endif

#   endif

#  endif

# else

		op = _InstPtr(newobj)->i_instvars;

		while (nInstVars--)

		    *op++ = nil;

# endif

#endif

		RETURN ( newobj );

	    } else {

		/*

		 * a GC will happen ...

		 * have to protect all context stuff

		 * (especially for self, but also for backtrace in case of

		 *  allocation failure)

		 */

		PROTECT_CONTEXT

		_qAlignedNew(newobj, instsize, SENDER);

		UNPROTECT_CONTEXT

		if (newobj != nil) {

		    goto ok;

		}

	    }

	}

    }

%}.

    "

     arrive here if something went wrong ...

     figure out what it was

    "

    (anInteger isMemberOf:SmallInteger) ifFalse:[

	"

	 the argument is either not an integer,

	 or a LargeInteger (which means that its definitely too big)

	"

	self error:'argument to new: must be Integer'.

	^ nil

    ].

    (anInteger < 0) ifTrue:[

	"

	 the argument is negative,

	"

	self error:'bad (negative) argument to new:'.

	^ nil

    ].

    "

     memory allocation failed.

     When we arrive here, there was no memory, even after

     a garbage collect. 

     This means, that the VM wanted to get some more memory from the 

     Operatingsystem, which was not kind enough to give it.

     Bad luck - you should increase the swap space on your machine.

    "

    ^ ObjectMemory allocationFailureSignal raise.

! !

!Array class methodsFor:'queries'!

isBuiltInClass

    "this class is known by the run-time-system"

    ^ self == Array

! !

!Array methodsFor:'accessing'!

size

    "return the number of indexed elements in the receiver.

     Reimplemented here to avoid the additional size->basicSize send

     (which we can do here, since size is obviously not redefined in a subclass).

     This method is the same as basicSize."

%{  /* NOCONTEXT */

    RETURN ( __MKSMALLINT(_arraySize(self) - _intVal(_ClassInstPtr(__qClass(self))->c_ninstvars) ));

%}

!

at:index

    "return the indexed instance variable with index, anInteger.

     Reimplemented here to avoid the additional at:->basicAt: send

     (which we can do here, since at: is obviously not redefined in a subclass).

     This method is the same as at:."

%{  /* NOCONTEXT */

    REGISTER int indx;

    REGISTER unsigned int nIndex;

    OBJ cls;

    if (__isSmallInteger(index)) {

	indx = _intVal(index) - 1;

	if (indx >= 0) {

	    nIndex = __BYTES2OBJS__(__qSize(self) - OHDR_SIZE);

	    if ((cls = __qClass(self)) != Array)

		indx += _intVal(_ClassInstPtr(cls)->c_ninstvars);

	    if (indx < nIndex) {

		RETURN ( _InstPtr(self)->i_instvars[indx] );

	    }

	}

    }

%}.

    ^ super at:index

!

basicAt:index put:anObject

    "store the 2nd arg, anObject as indexed instvar with index, anInteger.

     - added here for speed"

%{  /* NOCONTEXT */

    REGISTER int indx;

    REGISTER unsigned int nIndex;

    OBJ cls;

    if (__isSmallInteger(index)) {

	indx = _intVal(index) - 1;

	if (indx >= 0) {

	    nIndex = __BYTES2OBJS__(__qSize(self) - OHDR_SIZE);

	    if ((cls = __qClass(self)) != Array)

		indx += _intVal(_ClassInstPtr(cls)->c_ninstvars);

	    if (indx < nIndex) {

		_InstPtr(self)->i_instvars[indx] = anObject;

		__STORE(self, anObject);

		RETURN ( anObject );

	    }

	}

    }

%}

.

    ^ super basicAt:index put:anObject

! !

!Array methodsFor:'converting'!

asArray

    "return the receiver as an array"

    "could be an instance of a subclass..."

    self class == Array ifTrue:[

	^ self

    ].

    ^ super asArray

! !

!Array methodsFor:'copying'!

copyWith:something

    "return a new collection containing the receivers elements

     and the single new element, newElement. 

     This is different from concatentation, which expects another collection

     as argument, but equivalent to copy-and-addLast.

     Reimplemented for speed if receiver is an Array.

     (since the inherited copyWith uses replaceFromTo:, which is also

      tuned, it is questionable, if we need this)"

%{  /* NOCONTEXT */

    OBJ nObj, element;

    unsigned int sz;

    unsigned int nIndex;

    REGISTER OBJ *srcP, *dstP;

    REGISTER int spc;

    if (__qClass(self) == Array) {

	sz = __qSize(self) + sizeof(OBJ);

	PROTECT(something);

	PROTECT(self);

	_qAlignedNew(nObj, sz, __context);

	UNPROTECT(self);

	UNPROTECT(something);

	if (nObj) {

	    _InstPtr(nObj)->o_class = Array;

	    nIndex = __BYTES2OBJS__(sz - OHDR_SIZE - sizeof(OBJ));

	    /* 

	     * sorry: 

	     * cannot use bcopy, since we must take care of stores ... 

	     * could check for: notRemembered + inOld + notLifoRem

	     *                  + not incrGCRunning

	     * but copyWith: is not heavily used by real programmers ...

	     */

	    spc = __qSpace(nObj);

	    srcP = _ArrayInstPtr(self)->a_element;

	    dstP = _ArrayInstPtr(nObj)->a_element;

#ifdef UNROLL_LOOPS

	    while (nIndex >= 4) {

		element = srcP[0];

		dstP[0] = element;

		__STORE_SPC(nObj, element, spc);

		element = srcP[1];

		dstP[1] = element;

		__STORE_SPC(nObj, element, spc);

		element = srcP[2];

		dstP[2] = element;

		__STORE_SPC(nObj, element, spc);

		element = srcP[3];

		dstP[3] = element;

		__STORE_SPC(nObj, element, spc);

		srcP += 4;

		dstP += 4;

		nIndex -= 4;

	    }

#endif

	    while (nIndex--) {

		element = *srcP++;

		*dstP++ = element;

		__STORE_SPC(nObj, element, spc);

	    }

	    *dstP = something;

	    __STORE_SPC(nObj, something, spc);

	    RETURN ( nObj );

	}

    }

%}

.

    ^ super copyWith:something

! !

!Array methodsFor:'enumerating'!

from:start to:stop do:aBlock

    "evaluate the argument, aBlock for the elements starting at index start

     up to (and including) stop in the collection.

     - reimplemented for speed"

    |home|

%{

    REGISTER OBJFUNC codeVal;

    REGISTER int index;

    REGISTER OBJ rHome;

    int nIndex, nInsts;

    extern OBJ Block;

    static struct inlineCache val = _ILC1;

    int indexLow, indexHigh;

    if (__bothSmallInteger(start, stop)) {

	indexLow = _intVal(start);

	if (indexLow > 0) {

	    indexHigh = _intVal(stop);

	    if (__qClass(self) != Array) {

		nInsts = _intVal(_ClassInstPtr(__qClass(self))->c_ninstvars);

		indexLow += nInsts;

		indexHigh += nInsts;

	    }

	    nIndex = __BYTES2OBJS__(__qSize(self) - OHDR_SIZE);

	    if (indexHigh <= nIndex) {

		indexLow--;

		indexHigh--;

		if (__isBlockLike(aBlock)

		 && ((codeVal = _BlockInstPtr(aBlock)->b_code) != (OBJFUNC)nil)

		 && (_BlockInstPtr(aBlock)->b_nargs == __MKSMALLINT(1))) {

#ifdef NEW_BLOCK_CALL

		    for (index=indexLow; index <= indexHigh; index++) {

			if (InterruptPending != nil) __interruptL(@line COMMA_CON);

			(*codeVal)(aBlock, CON_COMMA  _InstPtr(self)->i_instvars[index]);

		    } 

#else