mirror of
https://gitlab.com/freepascal.org/fpc/source.git
synced 2025-10-31 13:11:27 +01:00
bd09b88a5b
o blocks are implemented as a variation of procedure variables
o declaration of a block variable: "test: procedure(c: char) is block;"
(C equivalent: (void)(^test)(char c) )
o the compiler automatically converts procedures/functions whose address
is passed to a block parameter or assigned to a block variable into
a "block". This consists of
1) generating a block descriptor (containing the size of the "block
literal" (see below) and the signature of the invocation function
encoded as an Objective-C selector)
2) generating a wrapper function around the original funcion (with C
calling convention), that has an extra first hidden parameter
(marked as vo_is_parentfp in the compiler) whose type is a pointer
to the describing "block literal"
3) generating the "block literal", which contains a pointer to an
external variable indicating whether this block captures context or
not, some flags (see compiler/blockutl.get_block_literal_flags for
info), a pointer to the wrapper function and a pointer to the
descriptor. In the future, it will also contain captured variables.
o right now, only global procedures/functions can be converted to blocks
(because they don't require state capturing). The next steps are (Object
Pascal) methods (not Objective-C methods, because Objective-C method
procvars don't exist) and finally nested functions
o on Mac OS X, the functionality will only work on Mac OS X 10.7 and later,
because we have to use the so-called "ABI.2010.3.16" to ensure that
our blocks aren't called as variadic functions by the runtime (which
came out after the Mac OS X 10.6 release)
o while the currently implemented functionality does not require any
library support at all, there's no use enabling it on other platforms
because unless it has been confirmed to work with a blocks runtime,
there's no point in using blocks (they're just somewhat bulky procvars
right now). Enabling it on other platforms (in combination with the
GNUStep Objective-C run time), should simply be a matter of adding
the right {$linklib xxx} statement to rtl/inc/blockrtl.pp file, adding
that file to Makefile.fpc for that platform and adding that platform
to the compiler/systems.systems_blocks_supported set
git-svn-id: branches/blocks@28232 -
657 lines
25 KiB
ObjectPascal
657 lines
25 KiB
ObjectPascal
{
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Copyright (c) 2010 by Jonas Maebe
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This unit implements some Objective-C type helper routines (minimal
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unit dependencies, usable in symdef).
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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****************************************************************************
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}
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{$i fpcdefs.inc}
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unit objcdef;
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interface
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uses
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node,
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symtype;
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{ The internals of Objective-C's @encode() functionality: encode a
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type into the internal format used by the run time. Returns false
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if a type is not representable by the Objective-C run time, and in
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that case also the failing definition. }
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function objctryencodetype(def: tdef; out encodedtype: ansistring; out founderror: tdef): boolean;
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{ Check whether a type can be used in an Objective-C method
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signature or field declaration. }
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function objcchecktype(def: tdef; out founderror: tdef): boolean;
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{ add type info for def at the end of encodedstr. recordinfostate influences
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whether a record-style type will be fully encoded, or just using its
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type name. bpacked indicates whether a record/array is bitpacked.
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On error, founderror contains the type that triggered the error. }
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type
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trecordinfostate = (ris_initial, ris_afterpointer, ris_dontprint);
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function objcaddencodedtype(def: tdef; recordinfostate: trecordinfostate; bpacked: boolean; var encodedstr: ansistring; out founderror: tdef): boolean;
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implementation
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uses
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globtype,
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cutils,cclasses,
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verbose,systems,
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symtable,symconst,symsym,symdef,
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defutil,paramgr;
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{******************************************************************
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Type encoding
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*******************************************************************}
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function encoderecst(const recname: ansistring; recst: tabstractrecordsymtable; var encodedstr: ansistring; out founderror: tdef): boolean;
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var
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variantstarts: tfplist;
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i, varindex: longint;
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field,
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firstfield: tfieldvarsym;
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firstfieldvariant,
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bpacked: boolean;
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begin
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result:=false;
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bpacked:=recst.fieldalignment=bit_alignment;
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{ Is the first field already the start of a variant? }
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firstfield:=nil;
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firstfieldvariant:=false;
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for i:=0 to recst.symlist.count-1 do
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begin
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if (tsym(recst.symlist[i]).typ<>fieldvarsym) then
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continue;
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field:=tfieldvarsym(recst.symlist[i]);
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if not assigned(firstfield) then
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firstfield:=field
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else if (vo_is_first_field in field.varoptions) then
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begin
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if (field.fieldoffset=firstfield.fieldoffset) then
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firstfieldvariant:=true;
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end;
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end;
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variantstarts:=tfplist.create;
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encodedstr:=encodedstr+'{'+recname+'=';
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for i:=0 to recst.symlist.count-1 do
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begin
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if (tsym(recst.symlist[i]).typ<>fieldvarsym) then
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continue;
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field:=tfieldvarsym(recst.symlist[i]);
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{ start of a variant part? }
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if ((field=firstfield) and
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firstfieldvariant) or
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((field<>firstfield) and
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(vo_is_first_field in field.varoptions)) then
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begin
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varindex:=variantstarts.count-1;
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if (varindex=-1) or
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(tfieldvarsym(variantstarts[varindex]).fieldoffset<field.fieldoffset) then
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begin
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{ new, more deeply nested variant }
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encodedstr:=encodedstr+'(?={?=';
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variantstarts.add(field);
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end
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else
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begin
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{ close existing nested variants if any }
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while (varindex>=0) and
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(tfieldvarsym(variantstarts[varindex]).fieldoffset>field.fieldoffset) do
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begin
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{ close more deeply nested variants }
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encodedstr:=encodedstr+'})';
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dec(varindex);
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end;
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if (varindex<0) then
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internalerror(2009081805);
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if (tfieldvarsym(variantstarts[varindex]).fieldoffset<>field.fieldoffset) then
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internalerror(2009081804);
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{ variant at the same level as a previous one }
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variantstarts.count:=varindex+1;
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{ No need to add this field, it has the same offset as the
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previous one at this position. }
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if tfieldvarsym(variantstarts[varindex]).fieldoffset<>field.fieldoffset then
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internalerror(2009081601);
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{ close previous variant sub-part and start new one }
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encodedstr:=encodedstr+'}{?=';
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end
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end;
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if not objcaddencodedtype(field.vardef,ris_afterpointer,bpacked,encodedstr,founderror) then
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exit;
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end;
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for i:=0 to variantstarts.count-1 do
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encodedstr:=encodedstr+'})';
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variantstarts.free;
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encodedstr:=encodedstr+'}';
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result:=true
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end;
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function objcaddencodedtype(def: tdef; recordinfostate: trecordinfostate; bpacked: boolean; var encodedstr: ansistring; out founderror: tdef): boolean;
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var
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recname: ansistring;
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recdef: trecorddef;
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objdef: tobjectdef;
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len: aint;
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c: char;
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newstate: trecordinfostate;
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addrpara: boolean;
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begin
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result:=true;
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case def.typ of
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stringdef :
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begin
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case tstringdef(def).stringtype of
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st_shortstring:
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{ include length byte }
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encodedstr:=encodedstr+'['+tostr(tstringdef(def).len+1)+'C]';
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else
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{ While we could handle refcounted Pascal strings correctly
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when such methods are called from Pascal code, things would
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completely break down if they were called from Objective-C
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code/reflection since the necessary refcount helper calls
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would be missing on the caller side (unless we'd
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automatically generate wrappers). }
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result:=false;
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end;
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end;
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enumdef,
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orddef :
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begin
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if bpacked and
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not is_void(def) then
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encodedstr:=encodedstr+'b'+tostr(def.packedbitsize)
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else
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begin
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if is_void(def) then
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c:='v'
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{ in gcc, sizeof(_Bool) = sizeof(char) }
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else if is_boolean(def) and
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(def.size=1) then
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c:='B'
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else
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begin
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case def.size of
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1:
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c:='c';
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2:
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c:='s';
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4:
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c:='i';
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8:
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c:='q';
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else
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internalerror(2009081502);
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end;
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if not is_signed(def) then
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c:=upcase(c);
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end;
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encodedstr:=encodedstr+c;
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end;
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end;
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pointerdef :
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begin
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if is_pchar(def) then
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encodedstr:=encodedstr+'*'
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else if (def=objc_idtype) then
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encodedstr:=encodedstr+'@'
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else if (def=objc_seltype) then
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encodedstr:=encodedstr+':'
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else if (def=objc_metaclasstype) then
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encodedstr:=encodedstr+'#'
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else
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begin
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encodedstr:=encodedstr+'^';
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newstate:=recordinfostate;
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if (recordinfostate<ris_dontprint) then
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newstate:=succ(newstate);
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if not objcaddencodedtype(tpointerdef(def).pointeddef,newstate,false,encodedstr,founderror) then
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begin
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result:=false;
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{ report the exact (nested) error defintion }
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exit;
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end;
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end;
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end;
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floatdef :
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begin
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case tfloatdef(def).floattype of
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s32real:
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c:='f';
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s64real:
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c:='d';
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else
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begin
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c:='!';
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result:=false;
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end;
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end;
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encodedstr:=encodedstr+c;
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end;
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filedef :
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result:=false;
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recorddef :
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begin
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if assigned(def.typesym) then
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recname:=def.typename
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else
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recname:='?';
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if (recordinfostate<>ris_dontprint) then
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begin
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if not encoderecst(recname,tabstractrecordsymtable(trecorddef(def).symtable),encodedstr,founderror) then
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begin
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result:=false;
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{ report the exact (nested) error defintion }
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exit;
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end
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end
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else
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encodedstr:=encodedstr+'{'+recname+'}'
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end;
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variantdef :
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begin
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recdef:=trecorddef(search_system_type('TVARDATA').typedef);
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if (recordinfostate<>ris_dontprint) then
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begin
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if not encoderecst(recdef.typename,tabstractrecordsymtable(recdef.symtable),encodedstr,founderror) then
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begin
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result:=false;
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{ report the exact (nested) error defintion }
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exit;
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end
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end
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else
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encodedstr:=encodedstr+'{'+recdef.typename+'}';
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end;
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classrefdef :
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begin
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encodedstr:=encodedstr+'^';
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newstate:=recordinfostate;
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if (recordinfostate<>ris_dontprint) then
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newstate:=succ(newstate);
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if is_objcclassref(def) then
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begin
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objdef:=tobjectdef(tclassrefdef(def).pointeddef);
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if (newstate<>ris_dontprint) then
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{ anonymous (objc)class definitions do not exist }
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begin
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if not encoderecst(objdef.objextname^,tabstractrecordsymtable(objdef.symtable),encodedstr,founderror) then
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{ The fields of an Objective-C class should always be
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encodeable. }
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internalerror(2009081702);
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end
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else
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encodedstr:=encodedstr+'{'+objdef.objextname^+'}'
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end
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{ Object Pascal classrefdefs point to a vmt, not really useful
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to completely write those here. I'm not even sure what the
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Objective-C run time uses this information for, since in C you
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can have forward struct definitions so not all structs passed
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to functions can be written out here either -> treat
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classrefdefs the same as such forward-defined structs. }
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else
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begin
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if assigned(def.typesym) then
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recname:=def.typename
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else
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recname:='?';
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encodedstr:=encodedstr+'{'+recname;
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if (newstate<>ris_dontprint) then
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encodedstr:=encodedstr+'=';
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encodedstr:=encodedstr+'}'
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end;
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end;
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setdef :
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begin
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addrpara:=paramanager.push_addr_param(vs_value,def,pocall_cdecl);
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if not addrpara then
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{ encode as an record, they are always passed by value in C. }
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encodedstr:=encodedstr+'{?=';
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{ Encode the set itself as an array. Without an encompassing
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record, these are always passed by reference in C. }
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encodedstr:=encodedstr+'['+tostr(def.size)+'C]';
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if not addrpara then
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encodedstr:=encodedstr+'}';
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end;
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formaldef :
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begin
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encodedstr:=encodedstr+'^v';
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end;
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arraydef :
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begin
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if is_array_of_const(def) then
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{ do nothing, varargs are ignored in signatures }
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else if is_special_array(def) then
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result:=false
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else
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begin
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len:=tarraydef(def).highrange-tarraydef(def).lowrange+1;
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if is_packed_array(def) then
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begin
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{ convert from bits to bytes for bitpacked arrays }
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len:=(len+7) div 8;
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{ and encode as plain array of bytes }
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encodedstr:=encodedstr+'['+tostr(len)+'C]';
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end
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else
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begin
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encodedstr:=encodedstr+'['+tostr(len);
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{ Embedded structured types in the array are printed
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in full regardless of the current recordinfostate. }
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if not objcaddencodedtype(tarraydef(def).elementdef,ris_initial,false,encodedstr,founderror) then
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begin
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result:=false;
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{ report the exact (nested) error defintion }
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exit;
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end;
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encodedstr:=encodedstr+']';
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end;
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end;
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end;
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procvardef :
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if not(po_is_block in tprocvardef(def).procoptions) then
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encodedstr:=encodedstr+'^?'
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else
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encodedstr:=encodedstr+'@?';
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objectdef :
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case tobjectdef(def).objecttype of
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odt_helper,
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odt_class,
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odt_object,
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odt_cppclass:
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begin
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newstate:=recordinfostate;
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{ implicit pointer for classes }
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if (tobjectdef(def).objecttype in [odt_class,odt_helper]) then
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begin
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encodedstr:=encodedstr+'^';
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{ make all classes opaque, so even if they contain a
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reference-counted field there is no problem. Since a
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"dereferenced class" object does not exist, this should
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not cause problems }
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newstate:=ris_dontprint;
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end;
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if newstate<>ris_dontprint then
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begin
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if not encoderecst(def.typename,tabstractrecordsymtable(tobjectdef(def).symtable),encodedstr,founderror) then
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begin
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result:=false;
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{ report the exact (nested) error defintion }
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exit;
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end
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end
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else
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encodedstr:=encodedstr+'{'+def.typename+'}'
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end;
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odt_interfacecom,
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odt_interfacecom_property,
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odt_interfacecom_function,
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odt_dispinterface:
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result:=false;
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odt_interfacecorba:
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encodedstr:=encodedstr+'^{'+def.typename+'=}';
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{ In Objective-C, the actual types of class instances are
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NSObject* etc, and those are encoded as "@". In FPC, to keep
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the similarity with Delphi-style Object Pascal, the type is
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NSObject and the pointer is implicit. Objective-C's "NSObject"
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has "class of NSObject" as equivalent here. }
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odt_objcclass,
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odt_objcprotocol:
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encodedstr:=encodedstr+'@';
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else
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internalerror(2009081509);
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end;
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undefineddef,
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errordef :
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result:=false;
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procdef :
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{ must be done via objcencodemethod() }
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internalerror(2009081511);
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else
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internalerror(2009150812);
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end;
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if not result then
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founderror:=def;
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end;
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function objctryencodetype(def: tdef; out encodedtype: ansistring; out founderror: tdef): boolean;
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begin
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result:=objcaddencodedtype(def,ris_initial,false,encodedtype,founderror);
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end;
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{******************************************************************
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ObjC type validity checking
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*******************************************************************}
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|
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function objcdochecktype(def: tdef; recordinfostate: trecordinfostate; out founderror: tdef): boolean; forward;
|
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|
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function checkrecsttype(recst: tabstractrecordsymtable; recordinfostate: trecordinfostate; out founderror: tdef): boolean;
|
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var
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i: longint;
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field: tfieldvarsym;
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newstate: trecordinfostate;
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begin
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result:=false;
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newstate:=recordinfostate;
|
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{ Although we never have to print the type info for nested
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records, check them anyway in case we're not after a pointer
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since if such records contain refcounted types then they
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can cause just as much trouble as if they were a simple
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refcounted field. }
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if (newstate=ris_afterpointer) then
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newstate:=ris_dontprint;
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||
for i:=0 to recst.symlist.count-1 do
|
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begin
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if (tsym(recst.symlist[i]).typ<>fieldvarsym) then
|
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continue;
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field:=tfieldvarsym(recst.symlist[i]);
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if not objcdochecktype(field.vardef,newstate,founderror) then
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exit;
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end;
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result:=true
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end;
|
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|
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|
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function objcdochecktype(def: tdef; recordinfostate: trecordinfostate; out founderror: tdef): boolean;
|
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var
|
||
recdef: trecorddef;
|
||
objdef: tobjectdef;
|
||
newstate: trecordinfostate;
|
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begin
|
||
result:=true;
|
||
case def.typ of
|
||
stringdef :
|
||
begin
|
||
case tstringdef(def).stringtype of
|
||
st_shortstring:
|
||
;
|
||
else
|
||
{ While we could handle refcounted Pascal strings correctly
|
||
when such methods are called from Pascal code, things would
|
||
completely break down if they were called from Objective-C
|
||
code/reflection since the necessary refcount helper calls
|
||
would be missing on the caller side (unless we'd
|
||
automatically generate wrappers). }
|
||
result:=false;
|
||
end;
|
||
end;
|
||
enumdef,
|
||
orddef :
|
||
;
|
||
pointerdef :
|
||
begin
|
||
newstate:=recordinfostate;
|
||
if (recordinfostate<ris_dontprint) then
|
||
newstate:=succ(newstate);
|
||
if not objcdochecktype(tpointerdef(def).pointeddef,newstate,founderror) then
|
||
begin
|
||
result:=false;
|
||
{ report the exact (nested) error defintion }
|
||
exit;
|
||
end;
|
||
end;
|
||
floatdef :
|
||
begin
|
||
case tfloatdef(def).floattype of
|
||
s32real,
|
||
s64real:
|
||
;
|
||
else
|
||
result:=false;
|
||
end;
|
||
end;
|
||
filedef :
|
||
result:=false;
|
||
recorddef :
|
||
begin
|
||
if (recordinfostate<>ris_dontprint) then
|
||
begin
|
||
if not checkrecsttype(tabstractrecordsymtable(trecorddef(def).symtable),recordinfostate,founderror) then
|
||
begin
|
||
result:=false;
|
||
{ report the exact (nested) error defintion }
|
||
exit;
|
||
end
|
||
end
|
||
end;
|
||
variantdef :
|
||
begin
|
||
recdef:=trecorddef(search_system_type('TVARDATA').typedef);
|
||
if (recordinfostate<>ris_dontprint) then
|
||
begin
|
||
if not checkrecsttype(tabstractrecordsymtable(recdef.symtable),recordinfostate,founderror) then
|
||
begin
|
||
result:=false;
|
||
{ report the exact (nested) error defintion }
|
||
exit;
|
||
end
|
||
end;
|
||
end;
|
||
classrefdef:
|
||
begin
|
||
if is_objcclassref(def) then
|
||
begin
|
||
objdef:=tobjectdef(tclassrefdef(def).pointeddef);
|
||
newstate:=recordinfostate;
|
||
if (recordinfostate<ris_dontprint) then
|
||
newstate:=succ(newstate);
|
||
if (newstate<>ris_dontprint) then
|
||
begin
|
||
if not checkrecsttype(tabstractrecordsymtable(objdef.symtable),recordinfostate,founderror) then
|
||
begin
|
||
result:=false;
|
||
{ report the exact (nested) error defintion }
|
||
exit;
|
||
end
|
||
end
|
||
end
|
||
end;
|
||
setdef,
|
||
formaldef :
|
||
;
|
||
arraydef :
|
||
begin
|
||
if is_array_of_const(def) then
|
||
{ ok, varargs are ignored in signatures }
|
||
else if is_special_array(def) then
|
||
result:=false
|
||
else
|
||
begin
|
||
if not is_packed_array(def) then
|
||
begin
|
||
if not objcdochecktype(tarraydef(def).elementdef,ris_initial,founderror) then
|
||
begin
|
||
result:=false;
|
||
{ report the exact (nested) error defintion }
|
||
exit;
|
||
end;
|
||
end;
|
||
end;
|
||
end;
|
||
procvardef :
|
||
;
|
||
objectdef :
|
||
case tobjectdef(def).objecttype of
|
||
odt_helper,
|
||
odt_class,
|
||
odt_object,
|
||
odt_cppclass:
|
||
begin
|
||
newstate:=recordinfostate;
|
||
{ implicit pointer for classes }
|
||
if (tobjectdef(def).objecttype in [odt_class,odt_helper]) then
|
||
begin
|
||
{ make all classes opaque, so even if they contain a
|
||
reference-counted field there is no problem. Since a
|
||
"dereferenced class" object does not exist, this should
|
||
not cause problems }
|
||
newstate:=ris_dontprint;
|
||
end;
|
||
if newstate<>ris_dontprint then
|
||
begin
|
||
if not checkrecsttype(tabstractrecordsymtable(tobjectdef(def).symtable),newstate,founderror) then
|
||
begin
|
||
result:=false;
|
||
{ report the exact (nested) error defintion }
|
||
exit;
|
||
end
|
||
end
|
||
end;
|
||
odt_interfacecom,
|
||
odt_interfacecom_property,
|
||
odt_interfacecom_function,
|
||
odt_dispinterface:
|
||
result:=false;
|
||
odt_interfacecorba,
|
||
odt_objcclass,
|
||
odt_objcprotocol:
|
||
;
|
||
else
|
||
internalerror(2009081709);
|
||
end;
|
||
undefineddef,
|
||
errordef :
|
||
result:=false;
|
||
procdef :
|
||
result:=false;
|
||
else
|
||
internalerror(2009170812);
|
||
end;
|
||
if not result then
|
||
founderror:=def;
|
||
end;
|
||
|
||
|
||
function objcchecktype(def: tdef; out founderror: tdef): boolean;
|
||
begin
|
||
result:=objcdochecktype(def,ris_initial,founderror);
|
||
end;
|
||
|
||
|
||
end.
|