* harbour/include/hbclass.ch
+ added validation for class data names. As additional preprocessor
rule to not use <!marker!>
* harbour/include/hboo.ch
* harbour/source/rtl/tclass.prg
* harbour/source/vm/classes.c
+ added delegate messages
* harbour/include/hbstack.h
* harbour/source/vm/arrays.c
* harbour/source/vm/estack.c
* harbour/source/vm/hvm.c
* harbour/source/vm/proc.c
+ added startup symbol to hb_stack. It gives very good stop
condition for all procedures which trace stack calls and
resolves the problem with hb_stack.pBase which was never
pointing to valid function/procedure symbol when no symbol
was put on HVM stack. Now after hb_stackInit() the first
item is allocated for "hb_stackInit()" symbol so hb_stack.pBase
is always a pointer to valid function/procedure symbol.
* changed the guard condition for buggy code in hb_stackPop()
and similar code from:
hb_stack.pPos < hb_stack.pItems
to:
hb_stack.pPos <= hb_stack.pBase
The old condition was generating usable error message only in the
startup function. In deeply called functions it was only waste of
CPU time on one of the most often call functions. Before it was
activated internal stack structures were corrupted.
If we were leaving for many years without really working stack
underflow protection then maybe we should think about disabling
it at when HB_STACK_MACROS are used and keep it only in real
stack functions for HVM developers. Single protection in
hb_stackOldFrame() I've just added is enough for basic C code
validation.
I created the second version of stack macros without it in
hbstack.h but I would like to hear other developers opinion.
* harbour/include/hbexprc.c
* Temporary disabled optimization with references to object variables
until we will not have extended reference items in our HVM.
It can be enabled by compiling with HB_USE_OBJMSG_REF
* harbour/include/hbclass.h
* restored previous CLASSDATA behavior which ignores SHARED clause
and always create shared class variables
* harbour/include/hbexprc.c
* translate HB_P_INC / HB_P_DEC in (pre|post)(inc|dec)rementation
to HB_P_[PLUS|MINUS]EQ
* harbour/source/vm/hvm.c
- removed not necessary now hb_itemUnRef() in hb_vmInc()/hb_vmDec()
* harbour/include/hbclass.ch
* most of the rules rewritten
! fixed some wrong rules and general cleanup
+ added additional code validation
! fixed compilation of more then one class in single file.
Now it's even possible to declare all classes at beginning of
single file and then implementing their methods in any order
! fixed using static classes and classes
! fixed compilation without <ClassName>_ prefix in method names
+ added support for HB_CLS_NO_DECORATION macro which disable
adding <ClassName>_ prefix to method names - this macro is
set by default when HB_SHORTNAMES is set.
+ added support for declared parameters validation - it can be
disabled with HB_CLS_NO_PARAMS_ERR and I had to disable it
by default due to problems with our preprocessor.
Ryszard seems that our PP has serious problems with decoding
directives when there is no space between symbol and some other
non symbol character. I had to add some workarounds and even
introduce buggy rules to make it working. Please look at it.
You can remove #define HB_CLS_NO_PARAMS_ERR from hbclass.ch
and try to rebuild Harbour core code to see the problem.
* harbour/include/hboo.ch
* harbour/source/vm/classes.c
+ added support for new primitive message: HB_OO_MSG_PERFORM
* harbour/source/rtl/tclass.prg
- removed <lPersistent> parameter from HBClass messages and
internals data. Persistent is supported as scope bit and
separate variable was redundant.
- removed stripping of () from message names. Here is not a place
to fix wrong preprocessor rules.
* harbour/utils/hbtest/rt_class.prg
* use: METHOD PROCEDURE ... CALSS ...
instead of: PROCEDURE ... CALSS ...
The first version is preferable syntax.
* harbour/source/debug/dbgtmenu.prg
* harbour/source/rtl/checkbox.prg
! fixed some parameters in method declaration - global cleanup
will have to wait for preprocessor fixes
Hi all,
Please make test with current hbclass.ch code.
I hope that I haven't broken too much things ;-) but I rewrite
from scratch most rules and it's possible that I missed sth or
made some stupid typos. Current version is much shorter and should
be easier to updated. For sure I've intentionally changed one thing.
CLASSDATA was ignoring SHARED attribute and always created shared
class variables. Seems that it was long existing typo but the fix
may interact with already existing code which needs SHARED class
variables but does not use SHARED clause in CLASSDATA declaration.
In such case please update it and add missing SHARED.
Also in the end of CLASS declaration we have:
[ ; #translate Super( <SuperClassN> ): => ::<SuperClassN>: ] ;
[ ; #translate Super( <SuperClass1> ): => ::<SuperClass1>: ] ;
[ ; #translate Super(): => ::<SuperClass1>: ] ;
[ ; #translate Super: => ::<SuperClass1>: ] ;
[ ; #translate ::Super : => ::<SuperClass1>: ]
These rules introduce very serious bug - they are breaking supercasting
in code which makes sth like:
::super:super:super:msg
or in any other code which sends SUPER message to some other class
objects. I will have to remove them. At least the last three ones.
There were some other things I wanted to write about but it's too late
and I'm to tired - sorry. If you will have any question please ask. if
you will notice some problems with current rules please inform me.
* harbour/source/vm/classes.c
* allow to access object variables using assign messages without
parameter. I do not want to add symmetric behavior for access messages
though it's technically possible but such things should be controlled
by programmer because access messages can have less restricted scoping
then assign ones (READONLY) so I'll add new rule for it in hbclass.ch
* harbour/source/vm/hvm.c
* fixed warning message when object variable reference is
generated using macro compiler without '_' as prefix.
* harbour/contrib/rdd_ads/ads1.c
* harbour/contrib/rdd_ads/adsfunc.c
* synced with Brian fixes in xHarbour
* harbour/source/rdd/workarea.c
* minor modification
* harbour/source/rdd/dbfcdx/dbfcdx1.c
* minor Clipper compatibility update
eg:
o:&send()
o:&send.end()
o:&(expr)()
o:&var++
o:&var := 0
o:&(expr)++
WITH OBJECT obj
++:&var
:&var += :&(var2+"oo")
END
NOTICE:
For simple assigments (=,:=), compound assignments (+=,-=,*=,/=)
and for pre/post increment operators( ++,--) the macro should
evaluate to a symbol that starts with underscore '_'.
To access a variable the macro should evaluate to a symbol
with no '_' char.
* harbour/include/common.ch
- removed ISSYMBOL()
* harbour/source/rtl/tclass.prg
* use valtype() instead of IS*()
* some minor modifications
* harbour/source/vm/hvm.c
* minor modification
* harbour/include/hbclass.ch
* updated some not enabled by default rules to use function pointers
instead of function names which I forgot to update in previous
commit
* harbour/include/common.ch
+ added ISSYMBOL()
* harbour/include/hbextern.ch
- removed __CLS_PARAM()
* harbour/include/hbclass.ch
* harbour/source/rtl/tclass.prg
* harbour/source/vm/classes.c
* replaced __CLS_PAR00() and __CLS_PARAM() functions by preprocessor
rules. These functions are not longer necessary though I left them
in classes.c for backward binary compatibility. Probably they will
be removed in the future.
! use function pointers (@<funcname>()) instead of function names
with REQUEST for super classes ID. It fixes using STATIC class
functions.
* harbour/make_rpm.sh
* check for rpmbuild also when BUGGY_RPM is set
* harbour/make_tgz.sh
* removed rebuild hbpptest with shared libraries
* harbour/include/hbapicls.h
+ added definitions for hb_clsCreate(), hb_clsAdd(), hb_clsAssociate()
* harbour/include/hbapierr.h
* harbour/source/rtl/errorapi.c
+ added hb_errFuncName - pseudo function name which can be used as
operation description in new error object. It should help to simplify
some code and fix function names when RT error is generated from C
function which can be executed from different .prg functions.
* harbour/include/hbclass.ch
+ added some missing Classy(y) compatible object variable type
descriptions: Int, Integer, Block
* harbour/source/rdd/dbfcdx/dbfcdx1.c
! disabled early retrieving from the cache key position and key count
* harbour/include/hbvm.h
* harbour/source/vm/hvm.c
+ added: void hb_vmPushEvalSym( void ) for the code which do not
want to access any [P]HB_SYMB structures
* changed symbol name in hb_symEval from __EVAL to EVAL and modified
hb_symEval registration method to not register hb_vmDoBlock as global
function. Having PHB_DYNS address for "EVAL" in hb_symEval.pDynSym
allows to eliminate some strcmp() when we are looking for EVAL public
symbol.
! fixed symbol table updating in PCODE functions for future multi module
.hrb files
* harbour/source/vm/proc.c
* use hb_symEval.pDynSym instead of strcmp()
* harbour/source/vm/arrays.c
* harbour/source/vm/debug.c
* minor code cleanup
* harbour/source/rtl/tclass.prg
* harbour/source/vm/classes.c
% separate message hash table from methods table - it will cause farther
reduction of allocated memory - many thanks to all people who send
me statistics about number of used classes and symbols from their code.
% use hb_symEval.pDynSym
+ added support for object variable type scope checking like in Class(y).
! fixed typo in pushing object class variables by reference
% s_pClasses is now indexed directly by class handle
% some other optimiztions
! make hidden and non virtual invisible in child classes if it overloaded
some other non hidden method. In such case the overloaded method is used
and can be accessed.
! make friend functions real method class oriented not (super)object for
hidden messages
* include/hbexprb.c
* source/compiler/exproptb.c
* source/compiler/harbour.y
*added support for passing the reference to object's variable
e.g.
foo( @obj:var )
* harbour/source/vm/itemapi.c
* minor modification in function order to group together the ones
which can operate on reference counters
+ added additional stop condition in hb_itemUnRef() - we will have
to make some modifications for the code which execute hb_itemUnRef()
to resolve some possible conflicts with operators overloading and
compiler optimizations
* harbour/source/vm/classes.c
* do not inherit friends - seems that our classes code was too
friendly ;-)
It also effectively resolves logical problem with accessing
overloaded non virtual methods from friends.
+ added __clsLock( <hClass> ) - it locks any farther class
modifications and can be used if programmer wants to be sure
that no one will try to hack his class definition. It's very
important when programmers work in a team on bigger project.
Please do not add to CVS any __clsUnLock() functions - if someone
needs it then he can create his own custom HVM build.
* code cleanup
* harbour/source/vm/eval.c
+ added hb_execFromArray() - idea and syntax borrowed from xHarbour's
HB_ExecFromArray() by Giancarlo Niccolai though it's independent
implementation. Now when we have support for functions with variable
number of parameters then we need sth like this function to fully
benefit from new feature. The following syntax is supported:
hb_execFromArray( <cFuncName> [, <aParams> ] )
hb_execFromArray( @<funcName>() [, <aParams> ] )
hb_execFromArray( <bCodeBlock> [, <aParams> ] )
hb_execFromArray( <oObject> , <cMethodName> [, <aParams> ] )
hb_execFromArray( <oObject> , @<msgName>() [, <aParams> ] )
or:
hb_execFromArray( <aExecArray> )
where <aExecArray> is in one of the following format:
{ <cFuncName> [, <params,...>] }
{ @<funcName>() [, <params,...>] }
{ <bCodeBlock> [, <params,...>] }
{ <oObject> , <cMethodName> [, <params,...>] }
{ <oObject> , @<msgName>() [, <params,...>] }
* harbour/source/rtl/symbol.prg
* removed C code inside #pragma BEGINDUMP/ENDDUMP
now it's only .prg code which uses variable parameters function
and hb_execFromArray()
* harbour/include/hbclass.ch
* harbour/include/hbvm.h
* harbour/source/rtl/tclass.prg
* harbour/source/vm/classes.c
* harbour/source/vm/hvm.c
! fixed bug in real codeblock scoping which was exploited by
dictionary resizing
* changed ACCESS messages to ASSIGN ones when object item
reference is created for proper READONLY scope checking.
The reference to object variable can be created only when
caller has sufficient ASSIGN privileges.
+ added FRIEND CLASS and FRIEND FUNCTION support.
It's enough to add class definition:
FRIEND CLASS <classFunc1> [, <classFuncN> ]
and/or:
FRIEND FUNCTION <FuncName1> [, <FuncNameN> ]
and all methods of given class or given function will be able
to access private variables.
Warning!!! Friends cannot access overloaded non virtual methods.
This feature is available _ONLY_ for real class members.
+ added MODULE FRIENDLY to class definition. It causes that all other
functions and classes defined in the same .prg module will have
friend privileges. In such way works xHarbour and there is now way
to disable this "feature" what is IMHO bug. In Harbour programmer
has to explicitly enable it (until he will not change / add new
preprocessor rule and set it as default ;-)). Syntax:
CREATE CLASS .... MODULE FRIENDLY
...
END CLASS
* harbour/source/vm/proc.c
* harbour/source/vm/runner.c
* updated function symbols processing
* harbour/source/compiler/harbour.c
* added note in hb_compOptimizeFrames() about exceeding maximum number
of local variables (255). We should add new pcode(s) HB_P_LARGE[V]FRAME
or generate compile time error.
* harbour/source/vm/macro.c
% minor optimizations
* harbour/contrib/rdd_ads/ads1.c
! fixed casting for C++ compilation
* harbour/source/compiler/harbour.c
! fixed removing locals frame - bSkipFrame was not initialized
* harbour/include/hbapi.h
* harbour/source/vm/estack.c
* harbour/source/vm/hvm.c
* harbour/source/vm/itemapi.c
* harbour/source/vm/proc.c
* moved current line number information from hb_struSymbol
to current stack state to keep 16 bytes size for HB_ITEM
on 32bit systems with 4 bytes alignment
* harbour/contrib/rdd_ads/ads1.c
* synced with recent xHarbour fixes
* harbour/include/hbdefs.h
* indenting
* harbour/include/hbexprb.c
* harbour/include/hbexprop.h
* harbour/source/common/expropt2.c
+ added compile time optimization for STOD(cConstDateString)
covered by -kh compiler extension (default)
It allows to keep the same source code for Clipper and
Harbour and benefits from data constants without using
0dYYYYMMDD values
* harbour/source/vm/classes.c
* restored the original 3-rd parameter in hb_clsAdd to void(void) -
PHB_FUNC - and added translation for PHB_SYMB to not force using
[P]HB_SYMB in 3-rd party code
* harbour/source/vm/estack.c
* added protection against possible GPF after executing
hb_stackBaseProcOffset() when first item on the stack
was not HB_IT_SYMBOL - it can happen in some seldom
cases. Probably some more general solution like leaving
first dummy item on HVM stack for breaking stack scan
loops will be better. I'll think about it.
* harbour/source/vm/itemapi.c
! fixed clearing enumerators
* include/hbpcode.h
+ added new pcode HB_P_VFRAME
* include/hbapi.h
+ added USHORT paramdeclcnt to asSymbol structure
* include/hbstack.h
* source/vm/estack.c
+ added hb_stackLocalVariable() to acces local variables
* source/compiler/genc.c
* source/compiler/gencc.c
* source/compiler/harbour.c
* source/compiler/harbour.l
* source/compiler/harbour.y
* source/compiler/hbdead.c
* source/compiler/hbfix.c
* source/compiler/hblbl.c
* source/compiler/hbpcode.c
* source/compiler/hbstripl.c
* source/vm/hvm.c
+ added support for variable number of parameters in
functions/procedures
+ tests/varparam.prg
* example usage of new syntax for variable number of
parameters
* source/vm/arrayshb.c
* changed HB_APARAMS() to use current stack frame if no
arguments are passed ( HB_APARAMS() == HB_APARAMS(0) )
SYNTAX for variable number of parameters
1) [FUNCTION|PROCEDURE] name( ... )
or
2) [FUNCTION|PROCEDURE] name( var1, var2, varN, ... )
To access passed parameters use the following:
PCOUNT() - returns number of passed parameters
HB_PVALUE( iParamNum ) - returns <iParamNum> parameter
HB_APARAMS() - returns array with all passed parameters
or usual name of parameter variable in case of syntax 2)
* harbour/include/hbexprb.c
* harbour/source/vm/hvm.c
+ added support to compiler for sending messages with multi
parameters resolved by macro operator: s:="1,2,3"; o:msg(&s)
It works just like for functions and it also needs XBASE extension
support enabled during compilation, -kx switch in compiler, it's
enabled by default.
* harbour/source/rdd/usrrdd/usrrdd.c
! added missing DBOI_* index in parameters passed to user ORDINFO()
method.
* harbour/include/hbapi.h
* harbour/include/hbapicls.h
* harbour/include/hbpcode.h
* harbour/include/hbxvm.h
* harbour/source/compiler/genc.c
* harbour/source/compiler/gencc.c
* harbour/source/compiler/hbdead.c
* harbour/source/compiler/hbfix.c
* harbour/source/compiler/hblbl.c
* harbour/source/compiler/hbpcode.c
* harbour/source/compiler/hbstripl.c
* harbour/source/vm/arrays.c
* harbour/source/vm/classes.c
* harbour/source/vm/codebloc.c
* harbour/source/vm/hvm.c
* harbour/source/vm/itemapi.c
+ added three new PCODEs:
HB_P_MACROSEND - to use for: s:=1,2,3"; o:=send(&s)
HB_P_PUSHOVARREF - to create references to object variables: @o:var
HB_P_ARRAYPUSHREF - to create references to array items, it can be used
in some optimization, f.e.: a[ <exp1> ] += <exp2>
or directly by: func( @a[ <exp> ] )
if we add passing array elements by reference
Implemented in HVM and PCODE generation, the compiler has to be
modified yet to use them.
* changed last parameter in hb_codeblockGetRef() - I'd like to have
all variables in hb_struRefer structure in one place: hb_itemUnRefOnce()
for easier modifications in the future.
* replaced in hb_struRefer 'itemsbase' with 'array'.
+ added hb_arrayGetItemRef() to create references to array elements.
Such reference updates array reference counters.
* changed STATICs passed by reference to use new array item references.
! block destructor execution after classy releasing on HVM exit
* harbour/source/vm/classes.c
+ added hb_clsRealMethodName() function which I'm using in some
test code
* harbour/tests/clsscast.prg
* updated to use __CLS_CNTSHRDATA() instead of __CLS_CNTCLSDATA()
* harbour/utils/hbtest/rt_class.prg
+ added tests for class and shared class variables/allocating
* xharbour/include/hbvm.h
* xharbour/source/vm/hvm.c
+ added hb_vmPushDynSym( PHB_DYNS )
It should allow most applications to not use [P]HB_SYMB at all.
Removing PHB_SYMB from 3-rd party .c code may allow us to add
freeing unused symbol tables from HVM in the future.
* harbour/source/vm/classes.c
* temporary restored hb_objGetpMethod()
+ added __ClsCntClasses()
! allocated real methods for OnError and Destructor to keep
the same behavior in these methods as in any others, f.e.
scoping checking or debugging.
* harbour/common.mak
* harbour/utils/hbtest/Makefile
* harbour/utils/hbtest/hbtest.prg
+ harbour/utils/hbtest/rt_class.prg
+ added tests for our classy code. Now destructors and instance
area allocating/casting. Some other in the future.
* harbour/contrib/rdd_ads/ads1.c
* synced with recent Brian fixes in xHarbour
* harbour/include/hbapi.h
+ added 'method' member to hb_struBlock structure
* harbour/source/vm/hvm.c
* initialize 'method' member in hb_struBlock structure
* harbour/source/vm/proc.c
* changed the name of last parameter of hb_procname() from
bSkipBlock to fMethodName and modified to use information
about the class of executed codeblock from new hb_struBlock
members
* harbour/source/vm/classes.c
* removed hb_objGetpMethod() - I hope it's not longer used
* added real codeblock scoping.
In Clipper there is no information where the codeblock where
created and what priviladges/scopes it should has.
Class(y) to resovle this problem when codeblock is executed scans
the HVM stack for the nearest method call and takes scopes defined
for this method. It's a workaround which allow to break standard
access rights though seems reasonable when it's not possible to
store information where the block is created. I've added to block
item structure information about class and method where code block
was created so we can use the exact method priviladges.
Now Harbour classy code can work exactly like Class(y) when compiled
with -DHB_CLASSY_BLOCK_SCOPE and with real code block scoping when
compiled with -DHB_REAL_BLOCK_SCOPE. I set the second (real code
block scopes) as default. If you think we should be strict Class(y)
compatible here then please inform me and I'll change default setting.
+ tests/clsscope.prg
+ added demonstration/test code for class method scoping
* harbour/source/vm/arrays.c
* harbour/source/vm/classes.c
! fixed multiple use of supercasted object I broke in last commit
* removed some unused code and moved some scoping checking to
class creation code
* harbour/include/hbvm.h
* harbour/source/vm/classes.c
* harbour/source/vm/hvm.c
+ added hb_vmRequestReenter() and hb_vmRequestRestore()
+ added executing destructors when some exception is active
I forgot about it in previous commit.
+ harbour/tests/destruct.prg
+ added example/test code for object destructors
+ harbour/doc/destruct.txt
+ added description for object destructors in Harbour
* harbour/include/error.ch
+ added new error code EG_DESTRUCTOR
* harbour/source/lang/msgpl852.c
* harbour/source/lang/msgpliso.c
* harbour/source/lang/msgplmaz.c
* harbour/source/lang/msgplwin.c
* harbour/source/rtl/langapi.c
+ added desription for new error code - other language modules
have to be updated
* harbour/include/hbapi.h
+ added hb_gcRefCheck() and cover some hb_gc* functions by
_HB_API_INTERNAL_ macro
* harbour/source/vm/itemapi.c
! fixed possible RT error generation when some exception is active
* harbour/include/hbapicls.h
* harbour/include/hbclass.ch
* harbour/include/hboo.ch
* harbour/source/rtl/tclass.prg
* harbour/source/vm/arrays.c
* harbour/source/vm/classes.c
+ added support for object destructors
* harbour/source/vm/garbage.c
+ added support for object destructors
+ added logic to detect buggu .prg code which uses destructors
see doc/destruct.txt for more info.
It's also possible that this code will exploit some bugs
in other code which uses GC allocated memory blocks.
* harbour/source/vm/garbage.c
* minor cleanup
* harbour/source/rtl/cdpapi.c
* harbour/include/hbextern.ch
+ added HB_CDPLIST() - it returns array with all registered CODEPAGEs
* harbour/source/rtl/set.c
! fixed typo in _SET_DEFEXTENSIONS
* harbour/tests/testrpt.prg
! fixed syntax
! use lower name in report name to work properly on case sensitive
file systems
* harbour/include/hbvm.h
* harbour/source/vm/hvm.c
* harbour/source/vm/itemapi.c
+ added __enumStop() message for "FOR EACH" overloading
It's guarantied that it will be sent to base item if it is an
object with such message when FOR EACH ... NEXT will finish its job
even if it will be interrupted by EXIT or RETURN to allow base object
clear resources allocated for FOR EACH enumerator. The BREAK exception
is not supported now. This is sth what I'd like to discuss soon when
I'll add destructors. Please think now if we should allow to execute
destructors and other cleanup user code when we are returning to
nearest expection trap (BEGIN SEQUENCE / [ RECOVER /] END) cleaning
the HVM stack.
* harbour/source/compiler/genc.c
* harbour/source/compiler/gencli.c
* harbour/source/compiler/harbour.c
! fixed number of compiled functions shown in compilation status
! added workaround for GPF in empty #pragma begindump/enddump
statement
* harbour/source/vm/classes.c
* keep class shared data in separate array
+ added __CLS_CNTSHRDATA( hClass ) -> nSharedDatas
% some minor optimizations
* harbour/tests/clsscast.prg
+ added test code for shared class data allocating and casting
* harbour/include/hbapicls.h
* harbour/source/vm/hvm.c
* harbour/source/vm/itemapi.c
+ added support for FOR EACH overloading - it's work in progress
do not create any code which may use current solution - it may
change in the nearest future
* harbour/include/hbapicls.ch
* added HB_EXPORT to public functions and some internal covered by
_HB_API_INTERNAL_ macro
* harbour/include/hboo.ch
+ added HB_OO_CLSTP_NONVIRTUAL and HB_OO_CLSTP_OVERLOADED
* harbour/source/rtl/tclass.prg
! do not add supercast class messages - now it's done automatically
by __clsNew() function with proper instance area offset updating
! enumerate instance class datas in __clsAddMsg() from 1 - inherited
instance variables are managed internally by classy code with
proper instance area offset updating
! use __CLS_CNTCLSDATA() as start offset for class data. Do not
try to calculate it yourself - some of super classes can be ignored
when they are appear in the inheritance tree more then once so it's
not possible to calculate class data or instance data start offset
using simple sum of class or instance variables in super classes.
* harbour/source/vm/classes.c
! fixed instance area casting
! fixed class variables casting
! fixed multi-inheritance when the same class can apear more then
once in super classes tree.
! Do not add unnecessary instance variables for the same class when
it's inherited more then once.
! Do not add unnecessary class variables for the same class when
it's inherited more then once.
! Do not add unnecessary initialization class and instance variables
+ added support for non virtual messages
+ added support for static and casted scoping
+ super cast messages added automatically. They are used to dynamic
recalculation of instance are offsets and to avoid multiple inheritance
of the same class so please do not overload them or you will have as
result something what we have before recent modifications in the
instance and class data area. Just simply run tests/clsccast.prg
and tests/clsicast.prg compiled with current CVS code and last
release code or with xHarbour and compare the results.
Also Class(y) does not pass these tests and I do not know if any
other dynamic OOP model in xbase languages can properly address it.
BTW maybe I should add RT error when .prg code will try to delete
or overwrite class cast message. For me it seems to be reasonable
and what's your opinion?
* make hidden class members non virtual by default. It can be disabled
by compiling classes.c with -DHB_VIRTUAL_HIDDEN but IMHO keeping
HIDDEN members as virtual causes that they are not really HIDDEN
because subclasses can simply overwrite them. It also means that
it's not possible to create class with some private data and
methods which will never interact with any subclass code created
by other programmers where name conflict can appear. So one of
the most important OOP features is missing in such case.
See tests/clsnv.prg as an example for non virtual hidden members.
+ tests/clsicast.prg
+ added test code for proper instance area allocating and casting
+ tests/clsccast.prg
+ added test code for proper class data allocating and casting
+ tests/clsnv.prg
+ added test code for non virtual hidden class members
Now we should be able to create and class model even replicate the
static one like in C++ using current class engine which still fully
supports dynamic bindings. It consumes less memory and due to much
more efficient hashing it should be faster then it was though some
other minor optimization can be add and I'll plan to make them in
some spare time.
The item type verification in assignment is still missing. I'll add
it when I'll collect some statistic informantion I'd like to ask
[x]Harbour users. I need these information to tune some internal
structures where I can balance between speed and memory allocation
to statistically optimal form.
Marek asked me to add passing object datas by reference and I'll do
that but I'd like to ask Ryszard to add support for:
@<oVar>:<message>
to compiler. I'll implement all other HVM modifications. If you can
please also add support for:
<oVar>:&<cMsgName>[(...)]
For this we do not need any HVM modifications or new PCODEs.
We are supporting xBase++ macro list compilation in:
cList:="1,2,3"
x := aVar[ &cList ]
aVar:={ &cList }
func( &cList )
But we do not support:
<oVar>:<message>( &cList )
IMHO it looks ugly. If we have this syntax for function call then we
should also support it in message sending.
Ryszard can you make necessary compiler modifications?
I'm also thinking about adding support for variable parameters
func myfunc(...)
[...]
return xVar
In few cases it will help to encode some function much more efficient
then now.
I'll add Class(y) compatible functions used in class(y) header files
so it will be possible to use original class(y) .ch files in Harbour
though it will not be the most efficient because we have @func() operator
which gives better performance then using codeblocks. Anyhow classy
create separate meta class for each class with CLASS members and
<clasName>() function always return such meta class object so for full
Class(y) compatibility we need to generate differ .prg code.
But all such modifications now can be done on preprocessor and
.prg level and they will not need .c code modification.
We should make them to give user interface for our new OOP features.
Now I'm waiting for reports about any problems with current classy
code.
* harbour/include/hbapi.h
* harbour/source/vm/hvm.c
* harbour/source/vm/codebloc.c
* harbour/source/vm/arrays.c
* moved static base offset from hb_struBlock structure
to HB_CODEBLOCK structure
+ added hclass member to hb_struBlock - it will be used in
the future for checking codeblock scope in classy so we will
real scope checking also for messages sent from codeblocks.
- removed supercast and superoffset members from hb_struArray
structure.
* harbour/include/hbclass.ch
* added class(y) like
@:<MessageName>([<MsgParams,...>])
send operator. It's not exactly the same as in class(y) where
this operator is hardcoded to executing function directly,
needs method name instead of message name and is linked statically.
In Harbour this operator uses message name so can be used also for
instance variables and make dynamic casting to the class from which
current method is inherited. In short words sending messages to @:
instead of :: causes that they work like non-virtual messages in
C++ mode.
If you do not use the same method body in different classes
then you can also use explicitly self casting:
::<myclass>:<msgname>[(...)]
and it will be a little bit faster
* harbour/include/hboo.ch
+ added: HB_OO_MSG_ASSIGN, HB_OO_MSG_ACCESS,
HB_OO_MSG_CLSASSIGN, HB_OO_MSG_CLSACCESS
They should be used insted of HB_OO_MSG_DATA and HB_OO_MSG_CLSDATA
This resolves problems with name conflicts when we were detecting
type of message (ACCESS/ASSIGN) by checking the first character
in message name. F.e. now it's possible to create exported instance
variable called __WithObject and it will be used in all WITH OBJECT
statement instead of the base object value. It's simple and effective
WITH OBJECT overloading.
I kept backward compatibility for HB_OO_MSG_DATA and HB_OO_MSG_CLSDATA
but I strongly suggest to update code to use new constants.
+ added HB_OO_MSG_REALCLASS
* harbour/source/rtl/objfunc.prg
* harbour/source/rtl/tobject.prg
* harbour/source/rtl/tclass.prg
* use HB_OO_MSG_[CLS]{ASSIGN,ACCESS} instead of HB_OO_MSG_[CLS]DATA
* harbour/source/rtl/tclass.prg
+ added REALCLASS message to creted classes - it's used for @: operator
* harbour/source/vm/classes.c
* updated for above modifications
* calculate instance area offset in supercasting dynamically - it
will allow to eliminate multiple instance area allocating when
in the inheritance tree the same class exists more then once and
also quite easy add support for non-virtual messages.
! fixed GPF in __CLSINSTSUPER() class function generate HVM exception
% do not inherit unaccessible inline blocks
* some other minor optimization, fixes and code cleanups
* harbour/source/rdd/usrrdd/usrrdd.c
! fixed HB_TRACE message
* harbour/source/rtl/errorapi.c
! generate internal error if ErrorNew() function does not return an object
* harbour/include/hbset.h
* harbour/include/set.ch
* harbour/source/pp/pptable.c
* harbour/source/rtl/set.c
+ Added Set( _SET_DEFEXTENSIONS, <logical: .T./.F.> )
Default value is .T. (CA-Cl*pper compatible). If set to .F.,
Harbour runtime/RDD code will never attempt to add a
default extension to the filename arguments. Commands/functions
where this setting makes a difference are:
- SET ALTERNATE TO / Set( _SET_ALTFILE_, ... )
- SET PRINTER TO / Set( _SET_PRINTFILE_, ... )
- Set( _SET_EXTRAFILE, ... )
- SAVE TO / __mvSave()
- RESTORE FROM / __mvRestore()
- LABEL FORM
- REPORT FORM
- COPY TO ... DELIMITED
- COPY TO ... SDF
- LIST / __dbList()
- USE / dbUseArea()
- dbCreate()
- SET INDEX TO / ordListAdd() (not yet implemented)
- __HRBLOAD(), __HRBRUN()
; Notes:
- From now on, it possible to create/load files using the
above functions/commands which have no extension. This
might be desirable in a few platform and/or situations.
For example on Win32, it's possible to directly print
to a shared Windows printer queue, using these commands:
lOldValue := Set( _SET_DEFEXTENSIONS, .F. )
SET PRINTER TO \\myserver\myprinter
Set( _SET_DEFEXTENSIONS, lOldValue )
Or, it is possible to open a dbf file which has no extension:
dbUseArea(.T., NIL, "dbf_filename_with_no_extension", "w_DATA", .F., .F.)
- Compiler is (of course) not affected by this setting.
- Preprocessor (PP) lib flavour is not affected by this setting.
- Support is not full in the RDD code yet.
* harbour/source/rdd/dbf1.c
* harbour/source/rdd/dblist.prg
* harbour/source/rdd/delim1.c
* harbour/source/rdd/sdf1.c
* harbour/source/rtl/tlabel.prg
* harbour/source/rtl/treport.prg
* harbour/source/rtl/set.c
* harbour/source/vm/memvars.c
* harbour/source/vm/runner.c
+ Honoring _SET_DEFEXTENSIONS setting all over the code.
