{ Copyright (c) 1998-2002 by Florian Klaempfl, Daniel Mantione Does the parsing and codegeneration at subroutine level This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. **************************************************************************** } unit psub; {$i fpcdefs.inc} interface uses cclasses,globals, node,nbas, symdef,procinfo,optdfa; type tcgprocinfo = class(tprocinfo) private procedure maybe_add_constructor_wrapper(var tocode: tnode; withexceptblock: boolean); procedure add_entry_exit_code; public { code for the subroutine as tree } code : tnode; { positions in the tree for init/final } entry_asmnode, loadpara_asmnode, exitlabel_asmnode, stackcheck_asmnode, init_asmnode, final_asmnode : tasmnode; dfabuilder : TDFABuilder; destructor destroy;override; procedure printproc(pass:string); procedure generate_code; procedure resetprocdef; procedure add_to_symtablestack; procedure remove_from_symtablestack; procedure parse_body; function has_assembler_child : boolean; end; procedure printnode_reset; { reads the declaration blocks } procedure read_declarations(islibrary : boolean); { reads declarations in the interface part of a unit } procedure read_interface_declarations; procedure generate_specialization_procs; implementation uses sysutils, { common } cutils, { global } globtype,tokens,verbose,comphook,constexp, systems, { aasm } cpuinfo,cpubase,aasmbase,aasmtai,aasmdata, { symtable } symconst,symbase,symsym,symtype,symtable,defutil, paramgr, ppu,fmodule, { pass 1 } nutils,nld,ncal,ncon,nflw,nadd,ncnv,nmem, pass_1, {$ifdef state_tracking} nstate, {$endif state_tracking} { pass 2 } {$ifndef NOPASS2} pass_2, {$endif} { parser } scanner,import,gendef, pbase,pstatmnt,pdecl,pdecsub,pexports, { codegen } tgobj,cgbase,cgobj,cgcpu,dbgbase, ncgutil,regvars, optbase, opttail, optcse,optloop, optutils {$if defined(arm) or defined(powerpc) or defined(powerpc64) or defined(avr)} ,aasmcpu {$endif arm} {$ifndef NOOPT} {$ifdef i386} ,aopt386 {$else i386} ,aopt {$endif i386} {$endif} ; {**************************************************************************** PROCEDURE/FUNCTION BODY PARSING ****************************************************************************} procedure initializevars(p:TObject;arg:pointer); var b : tblocknode; begin if not (tsym(p).typ in [localvarsym,staticvarsym]) then exit; with tabstractnormalvarsym(p) do begin if assigned(defaultconstsym) then begin b:=tblocknode(arg); b.left:=cstatementnode.create( cassignmentnode.create( cloadnode.create(tsym(p),tsym(p).owner), cloadnode.create(defaultconstsym,defaultconstsym.owner)), b.left); end; end; end; procedure check_finalize_paras(p:TObject;arg:pointer); begin if (tsym(p).typ=paravarsym) and (tparavarsym(p).varspez=vs_value) and is_managed_type(tparavarsym(p).vardef) then include(current_procinfo.flags,pi_needs_implicit_finally); end; procedure check_finalize_locals(p:TObject;arg:pointer); begin { include the result: it needs to be finalized in case an exception } { occurs } if (tsym(p).typ=localvarsym) and (tlocalvarsym(p).refs>0) and is_managed_type(tlocalvarsym(p).vardef) then include(current_procinfo.flags,pi_needs_implicit_finally); end; function block(islibrary : boolean) : tnode; var oldfilepos: tfileposinfo; begin { parse const,types and vars } read_declarations(islibrary); { do we have an assembler block without the po_assembler? we should allow this for Delphi compatibility (PFV) } if (token=_ASM) and (m_delphi in current_settings.modeswitches) then include(current_procinfo.procdef.procoptions,po_assembler); { Handle assembler block different } if (po_assembler in current_procinfo.procdef.procoptions) then begin block:=assembler_block; exit; end; {Unit initialization?.} if ( assigned(current_procinfo.procdef.localst) and (current_procinfo.procdef.localst.symtablelevel=main_program_level) and (current_module.is_unit or islibrary) ) then begin if (token=_END) then begin consume(_END); { We need at least a node, else the entry/exit code is not generated and thus no PASCALMAIN symbol which we need (PFV) } if islibrary then block:=cnothingnode.create else block:=nil; end else begin if token=_INITIALIZATION then begin { The library init code is already called and does not need to be in the initfinal table (PFV) } block:=statement_block(_INITIALIZATION); { optimize empty initialization block away } if (block.nodetype=blockn) and (tblocknode(block).left=nil) then FreeAndNil(block) else if not islibrary then current_module.flags:=current_module.flags or uf_init; end else if token=_FINALIZATION then begin { when a unit has only a finalization section, we can come to this point when we try to read the nonh existing initalization section so we've to check if we are really try to parse the finalization } if current_procinfo.procdef.proctypeoption=potype_unitfinalize then begin block:=statement_block(_FINALIZATION); { optimize empty finalization block away } if (block.nodetype=blockn) and (tblocknode(block).left=nil) then FreeAndNil(block) else current_module.flags:=current_module.flags or uf_finalize; end else block:=nil; end else begin { The library init code is already called and does not need to be in the initfinal table (PFV) } if not islibrary then current_module.flags:=current_module.flags or uf_init; block:=statement_block(_BEGIN); end; end; end else begin block:=statement_block(_BEGIN); if current_procinfo.procdef.localst.symtabletype=localsymtable then begin { initialization of local variables with their initial values: part of function entry } oldfilepos:=current_filepos; current_filepos:=current_procinfo.entrypos; current_procinfo.procdef.localst.SymList.ForEachCall(@initializevars,block); current_filepos:=oldfilepos; end; end; end; {**************************************************************************** PROCEDURE/FUNCTION COMPILING ****************************************************************************} procedure printnode_reset; begin assign(printnodefile,treelogfilename); {$push}{$I-} rewrite(printnodefile); {$pop} if ioresult<>0 then begin Comment(V_Error,'Error creating '+treelogfilename); exit; end; close(printnodefile); end; procedure add_label_init(p:TObject;arg:pointer); begin if tstoredsym(p).typ=labelsym then begin addstatement(tstatementnode(arg^), cifnode.create(caddnode.create(equaln, ccallnode.createintern('fpc_setjmp', ccallparanode.create(cloadnode.create(tlabelsym(p).jumpbuf,tlabelsym(p).jumpbuf.owner),nil)), cordconstnode.create(1,sinttype,true)) ,cgotonode.create(tlabelsym(p)),nil) ); end; end; function generate_bodyentry_block:tnode; var srsym : tsym; para : tcallparanode; newstatement : tstatementnode; begin result:=internalstatements(newstatement); if assigned(current_structdef) then begin { a constructor needs a help procedure } if (current_procinfo.procdef.proctypeoption=potype_constructor) then begin if is_class(current_structdef) then begin include(current_procinfo.flags,pi_needs_implicit_finally); srsym:=search_struct_member(current_structdef,'NEWINSTANCE'); if assigned(srsym) and (srsym.typ=procsym) then begin { if vmt>1 then newinstance } addstatement(newstatement,cifnode.create( caddnode.create(gtn, ctypeconvnode.create_internal( load_vmt_pointer_node, voidpointertype), cpointerconstnode.create(1,voidpointertype)), cassignmentnode.create( ctypeconvnode.create_internal( load_self_pointer_node, voidpointertype), ccallnode.create(nil,tprocsym(srsym),srsym.owner,load_vmt_pointer_node,[])), nil)); end else internalerror(200305108); end else if is_object(current_structdef) then begin { parameter 3 : vmt_offset } { parameter 2 : address of pointer to vmt, this is required to allow setting the vmt to -1 to indicate that memory was allocated } { parameter 1 : self pointer } para:=ccallparanode.create( cordconstnode.create(tobjectdef(current_structdef).vmt_offset,s32inttype,false), ccallparanode.create( ctypeconvnode.create_internal( load_vmt_pointer_node, voidpointertype), ccallparanode.create( ctypeconvnode.create_internal( load_self_pointer_node, voidpointertype), nil))); addstatement(newstatement,cassignmentnode.create( ctypeconvnode.create_internal( load_self_pointer_node, voidpointertype), ccallnode.createintern('fpc_help_constructor',para))); end else if not is_record(current_structdef) then internalerror(200305103); { if self=nil then exit calling fail instead of exit is useless because there is nothing to dispose (PFV) } if is_class_or_object(current_structdef) then addstatement(newstatement,cifnode.create( caddnode.create(equaln, load_self_pointer_node, cnilnode.create), cexitnode.create(nil), nil)); end; { maybe call BeforeDestruction for classes } if (current_procinfo.procdef.proctypeoption=potype_destructor) and is_class(current_structdef) then begin srsym:=search_struct_member(current_structdef,'BEFOREDESTRUCTION'); if assigned(srsym) and (srsym.typ=procsym) then begin { if vmt>0 then beforedestruction } addstatement(newstatement,cifnode.create( caddnode.create(gtn, ctypeconvnode.create_internal( load_vmt_pointer_node,ptrsinttype), ctypeconvnode.create_internal( cnilnode.create,ptrsinttype)), ccallnode.create(nil,tprocsym(srsym),srsym.owner,load_self_node,[]), nil)); end else internalerror(200305104); end; end; if m_non_local_goto in current_settings.modeswitches then tsymtable(current_procinfo.procdef.localst).SymList.ForEachCall(@add_label_init,@newstatement); end; function generate_bodyexit_block:tnode; var srsym : tsym; para : tcallparanode; newstatement : tstatementnode; oldlocalswitches: tlocalswitches; begin result:=internalstatements(newstatement); if assigned(current_structdef) then begin { Don't test self and the vmt here. The reason is that } { a constructor already checks whether these are valid } { before. Further, in case of TThread the thread may } { free the class instance right after AfterConstruction } { has been called, so it may no longer be valid (JM) } oldlocalswitches:=current_settings.localswitches; current_settings.localswitches:=oldlocalswitches-[cs_check_object,cs_check_range]; { a destructor needs a help procedure } if (current_procinfo.procdef.proctypeoption=potype_destructor) then begin if is_class(current_structdef) then begin srsym:=search_struct_member(current_structdef,'FREEINSTANCE'); if assigned(srsym) and (srsym.typ=procsym) then begin { if self<>0 and vmt<>0 then freeinstance } addstatement(newstatement,cifnode.create( caddnode.create(andn, caddnode.create(unequaln, load_self_pointer_node, cnilnode.create), caddnode.create(unequaln, ctypeconvnode.create( load_vmt_pointer_node, voidpointertype), cpointerconstnode.create(0,voidpointertype))), ccallnode.create(nil,tprocsym(srsym),srsym.owner,load_self_node,[]), nil)); end else internalerror(200305108); end else if is_object(current_structdef) then begin { finalize object data, but only if not in inherited call } if is_managed_type(current_structdef) then begin addstatement(newstatement,cifnode.create( caddnode.create(unequaln, ctypeconvnode.create_internal(load_vmt_pointer_node,voidpointertype), cnilnode.create), finalize_data_node(load_self_node), nil)); end; { parameter 3 : vmt_offset } { parameter 2 : pointer to vmt } { parameter 1 : self pointer } para:=ccallparanode.create( cordconstnode.create(tobjectdef(current_structdef).vmt_offset,s32inttype,false), ccallparanode.create( ctypeconvnode.create_internal( load_vmt_pointer_node, voidpointertype), ccallparanode.create( ctypeconvnode.create_internal( load_self_pointer_node, voidpointertype), nil))); addstatement(newstatement, ccallnode.createintern('fpc_help_destructor',para)); end else internalerror(200305105); end; current_settings.localswitches:=oldlocalswitches; end; end; function generate_except_block:tnode; var newstatement : tstatementnode; { safecall handling } exceptobjnode,exceptaddrnode: ttempcreatenode; sym,exceptsym: tsym; begin generate_except_block:=internalstatements(newstatement); { a constructor needs call destructor (if available) when it is not inherited } if not assigned(current_structdef) or (current_procinfo.procdef.proctypeoption<>potype_constructor) then begin { no constructor } { must be the return value finalized before reraising the exception? } if (not is_void(current_procinfo.procdef.returndef)) and is_managed_type(current_procinfo.procdef.returndef) and (not paramanager.ret_in_param(current_procinfo.procdef.returndef, current_procinfo.procdef.proccalloption)) and (not is_class(current_procinfo.procdef.returndef)) then addstatement(newstatement,finalize_data_node(load_result_node)); {$if defined(x86) or defined(arm)} { safecall handling } if (tf_safecall_exceptions in target_info.flags) and (current_procinfo.procdef.proccalloption=pocall_safecall) then begin { create a local hidden variable "safe_result" } { it will be used in ncgflw unit } { to set "real" result value for safecall routine } sym:=tlocalvarsym.create('$safe_result',vs_value,hresultdef,[]); include(sym.symoptions,sp_internal); current_procinfo.procdef.localst.insert(sym); { if safecall is used for a class method we need to call } { SafecallException virtual method } { In other case we return E_UNEXPECTED error value } if is_class(current_procinfo.procdef.struct) then begin { temp variable to store exception address } exceptaddrnode:=ctempcreatenode.create(voidpointertype,voidpointertype.size, tt_persistent,true); addstatement(newstatement,exceptaddrnode); addstatement(newstatement, cassignmentnode.create( ctemprefnode.create(exceptaddrnode), ccallnode.createintern('fpc_getexceptionaddr',nil))); { temp variable to store popped up exception } exceptobjnode:=ctempcreatenode.create(class_tobject,class_tobject.size, tt_persistent,true); addstatement(newstatement,exceptobjnode); addstatement(newstatement, cassignmentnode.create( ctemprefnode.create(exceptobjnode), ccallnode.createintern('fpc_popobjectstack', nil))); exceptsym:=search_struct_member(tobjectdef(current_procinfo.procdef.struct),'SAFECALLEXCEPTION'); addstatement(newstatement, cassignmentnode.create( cloadnode.create(sym,sym.Owner), ccallnode.create( ccallparanode.create(ctemprefnode.create(exceptaddrnode), ccallparanode.create(ctemprefnode.create(exceptobjnode),nil)), tprocsym(exceptsym), tprocsym(exceptsym).owner,load_self_node,[]))); addstatement(newstatement,ccallnode.createintern('fpc_destroyexception', ccallparanode.create(ctemprefnode.create(exceptobjnode),nil))); addstatement(newstatement,ctempdeletenode.create(exceptobjnode)); addstatement(newstatement,ctempdeletenode.create(exceptaddrnode)); end else begin { pop up and destroy an exception } addstatement(newstatement,ccallnode.createintern('fpc_destroyexception', ccallparanode.create(ccallnode.createintern('fpc_popobjectstack', nil),nil))); addstatement(newstatement, cassignmentnode.create( cloadnode.create(sym,sym.Owner), genintconstnode(HResult($8000FFFF)))); end; end; {$endif} end; end; {**************************************************************************** TCGProcInfo ****************************************************************************} destructor tcgprocinfo.destroy; begin if assigned(code) then code.free; inherited destroy; end; procedure tcgprocinfo.printproc(pass:string); begin assign(printnodefile,treelogfilename); {$push}{$I-} append(printnodefile); if ioresult<>0 then rewrite(printnodefile); {$pop} if ioresult<>0 then begin Comment(V_Error,'Error creating '+treelogfilename); exit; end; writeln(printnodefile); writeln(printnodefile,'*******************************************************************************'); writeln(printnodefile, pass); writeln(printnodefile,procdef.fullprocname(false)); writeln(printnodefile,'*******************************************************************************'); printnode(printnodefile,code); close(printnodefile); end; procedure tcgprocinfo.maybe_add_constructor_wrapper(var tocode: tnode; withexceptblock: boolean); var oldlocalswitches: tlocalswitches; srsym: tsym; afterconstructionblock, exceptblock, newblock: tblocknode; newstatement: tstatementnode; pd: tprocdef; begin if assigned(current_structdef) and (current_procinfo.procdef.proctypeoption=potype_constructor) then begin { Don't test self and the vmt here. See generate_bodyexit_block } { why (JM) } oldlocalswitches:=current_settings.localswitches; current_settings.localswitches:=oldlocalswitches-[cs_check_object,cs_check_range]; { call AfterConstruction for classes } if is_class(current_structdef) then begin srsym:=search_struct_member(current_structdef,'AFTERCONSTRUCTION'); if assigned(srsym) and (srsym.typ=procsym) then begin current_filepos:=exitpos; afterconstructionblock:=internalstatements(newstatement); { first execute all constructor code. If no exception occurred then we will execute afterconstruction, otherwise we won't (the exception will jump over us) } addstatement(newstatement,tocode); { Self can be nil when fail is called } { if self<>nil and vmt<>nil then afterconstruction } addstatement(newstatement,cifnode.create( caddnode.create(andn, caddnode.create(unequaln, load_self_node, cnilnode.create), caddnode.create(unequaln, load_vmt_pointer_node, cnilnode.create)), ccallnode.create(nil,tprocsym(srsym),srsym.owner,load_self_node,[]), nil)); tocode:=afterconstructionblock; end else internalerror(200305106); end; if withexceptblock and (current_structdef.typ=objectdef) then begin { Generate the implicit "fail" code for a constructor (destroy in case an exception happened) } pd:=tobjectdef(current_structdef).find_destructor; { this will always be the case for classes, since tobject has a destructor } if assigned(pd) then begin current_filepos:=exitpos; exceptblock:=internalstatements(newstatement); { first free the instance if non-nil } { if vmt<>0 then call destructor } addstatement(newstatement,cifnode.create( caddnode.create(unequaln, load_vmt_pointer_node, cnilnode.create), { cnf_create_failed -> don't call BeforeDestruction } ccallnode.create(nil,tprocsym(pd.procsym),pd.procsym.owner,load_self_node,[cnf_create_failed]), nil)); { then re-raise the exception } addstatement(newstatement,craisenode.create(nil,nil,nil)); current_filepos:=entrypos; newblock:=internalstatements(newstatement); { try tocode except exceptblock end } addstatement(newstatement,ctryexceptnode.create( tocode, nil, exceptblock)); tocode:=newblock; end; end; current_settings.localswitches:=oldlocalswitches; end; end; procedure tcgprocinfo.add_entry_exit_code; var finalcode, bodyentrycode, bodyexitcode, exceptcode, wrappedbody: tnode; newblock : tblocknode; codestatement, newstatement : tstatementnode; oldfilepos : tfileposinfo; begin oldfilepos:=current_filepos; { Generate code/locations used at start of proc } current_filepos:=entrypos; entry_asmnode:=casmnode.create_get_position; loadpara_asmnode:=casmnode.create_get_position; stackcheck_asmnode:=casmnode.create_get_position; init_asmnode:=casmnode.create_get_position; bodyentrycode:=generate_bodyentry_block; { Generate code/locations used at end of proc } current_filepos:=exitpos; exitlabel_asmnode:=casmnode.create_get_position; final_asmnode:=casmnode.create_get_position; bodyexitcode:=generate_bodyexit_block; { Generate procedure by combining init+body+final, depending on the implicit finally we need to add an try...finally...end wrapper } newblock:=internalstatements(newstatement); if (cs_implicit_exceptions in current_settings.moduleswitches) and (pi_needs_implicit_finally in flags) and { but it's useless in init/final code of units } not(procdef.proctypeoption in [potype_unitfinalize,potype_unitinit]) then begin { Generate special exception block only needed when implicit finaly is used } current_filepos:=exitpos; exceptcode:=generate_except_block; { Generate code that will be in the try...finally } finalcode:=internalstatements(codestatement); addstatement(codestatement,final_asmnode); { Initialize before try...finally...end frame } addstatement(newstatement,loadpara_asmnode); addstatement(newstatement,stackcheck_asmnode); addstatement(newstatement,entry_asmnode); addstatement(newstatement,init_asmnode); addstatement(newstatement,bodyentrycode); current_filepos:=entrypos; wrappedbody:=ctryfinallynode.create_implicit( code, finalcode, exceptcode); { afterconstruction must be called after final_asmnode, because it has to execute after the temps have been finalised in case of a refcounted class (afterconstruction decreases the refcount without freeing the instance if the count becomes nil, while the finalising of the temps can free the instance) } maybe_add_constructor_wrapper(wrappedbody,true); addstatement(newstatement,wrappedbody); addstatement(newstatement,exitlabel_asmnode); addstatement(newstatement,bodyexitcode); { set flag the implicit finally has been generated } include(flags,pi_has_implicit_finally); end else begin maybe_add_constructor_wrapper(code,false); addstatement(newstatement,loadpara_asmnode); addstatement(newstatement,stackcheck_asmnode); addstatement(newstatement,entry_asmnode); addstatement(newstatement,init_asmnode); addstatement(newstatement,bodyentrycode); addstatement(newstatement,code); addstatement(newstatement,exitlabel_asmnode); addstatement(newstatement,bodyexitcode); addstatement(newstatement,final_asmnode); end; do_firstpass(tnode(newblock)); code:=newblock; current_filepos:=oldfilepos; end; procedure clearrefs(p:TObject;arg:pointer); begin if (tsym(p).typ in [localvarsym,paravarsym,staticvarsym]) then if tabstractvarsym(p).refs>1 then tabstractvarsym(p).refs:=1; end; procedure translate_registers(p:TObject;list:pointer); begin if (tsym(p).typ in [localvarsym,paravarsym,staticvarsym]) and (tabstractnormalvarsym(p).localloc.loc in [LOC_REGISTER,LOC_CREGISTER,LOC_MMREGISTER, LOC_CMMREGISTER,LOC_FPUREGISTER,LOC_CFPUREGISTER]) then begin if not(cs_no_regalloc in current_settings.globalswitches) then cg.translate_register(tabstractnormalvarsym(p).localloc.register); if cs_asm_source in current_settings.globalswitches then TAsmList(list).concat(Tai_comment.Create(strpnew('Var '+tabstractnormalvarsym(p).realname+' located in register '+ std_regname(tabstractnormalvarsym(p).localloc.register)))) end; end; function tcgprocinfo.has_assembler_child : boolean; var hp : tprocinfo; begin result:=false; hp:=get_first_nestedproc; while assigned(hp) do begin if (hp.flags*[pi_has_assembler_block,pi_is_assembler])<>[] then begin result:=true; exit; end; hp:=tprocinfo(hp.next); end; end; procedure tcgprocinfo.generate_code; var old_current_procinfo : tprocinfo; oldmaxfpuregisters : longint; oldfilepos : tfileposinfo; old_current_structdef : tabstractrecorddef; templist : TAsmList; headertai : tai; i : integer; varsym : tabstractnormalvarsym; {RedoDFA : boolean;} begin { the initialization procedure can be empty, then we don't need to generate anything. When it was an empty procedure there would be at least a blocknode } if not assigned(code) then exit; { We need valid code } if Errorcount<>0 then exit; { No code can be generated for generic template } if (df_generic in procdef.defoptions) then internalerror(200511152); { The RA and Tempgen shall not be available yet } if assigned(tg) then internalerror(200309201); old_current_procinfo:=current_procinfo; oldfilepos:=current_filepos; old_current_structdef:=current_structdef; oldmaxfpuregisters:=current_settings.maxfpuregisters; current_procinfo:=self; current_filepos:=entrypos; current_structdef:=procdef.struct; templist:=TAsmList.create; { add parast/localst to symtablestack } add_to_symtablestack; { clear register count } procdef.localst.SymList.ForEachCall(@clearrefs,nil); procdef.parast.SymList.ForEachCall(@clearrefs,nil); { there's always a call to FPC_INITIALIZEUNITS/FPC_DO_EXIT in the main program } if (procdef.localst.symtablelevel=main_program_level) and (not current_module.is_unit) then include(flags,pi_do_call); { set implicit_finally flag when there are locals/paras to be finalized } procdef.parast.SymList.ForEachCall(@check_finalize_paras,nil); procdef.localst.SymList.ForEachCall(@check_finalize_locals,nil); {$if defined(x86) or defined(arm)} { set implicit_finally flag for if procedure is safecall } if (tf_safecall_exceptions in target_info.flags) and (procdef.proccalloption=pocall_safecall) then include(flags, pi_needs_implicit_finally); {$endif} { firstpass everything } flowcontrol:=[]; do_firstpass(code); {$ifdef i386} procdef.fpu_used:=node_resources_fpu(code); if procdef.fpu_used>0 then include(flags,pi_uses_fpu); {$endif i386} { Print the node to tree.log } if paraprintnodetree=1 then printproc( 'after the firstpass'); { do this before adding the entry code else the tail recursion recognition won't work, if this causes troubles, it must be if'ed } if (cs_opt_tailrecursion in current_settings.optimizerswitches) and (pi_is_recursive in flags) then do_opttail(code,procdef); if (cs_opt_nodedfa in current_settings.optimizerswitches) and { creating dfa is not always possible } ((flags*[pi_has_assembler_block,pi_uses_exceptions,pi_is_assembler, pi_needs_implicit_finally,pi_has_implicit_finally])=[]) then begin dfabuilder:=TDFABuilder.Create; dfabuilder.createdfainfo(code); { when life info is available, we can give more sophisticated warning about unintialized variables } { iterate through life info of the first node } for i:=0 to dfabuilder.nodemap.count-1 do begin if DFASetIn(code.optinfo^.life,i) then case tnode(dfabuilder.nodemap[i]).nodetype of loadn: begin varsym:=tabstractnormalvarsym(tloadnode(dfabuilder.nodemap[i]).symtableentry); { Give warning/note for living locals } if assigned(varsym.owner) and not(vo_is_external in varsym.varoptions) then begin if (vo_is_funcret in varsym.varoptions) then CGMessage(sym_w_function_result_uninitialized) else begin if (varsym.owner=procdef.localst) and not (vo_is_typed_const in varsym.varoptions) then CGMessage1(sym_w_uninitialized_local_variable,varsym.realname); end; end; end; end; end; include(flags,pi_dfaavailable); end; if (cs_opt_loopstrength in current_settings.optimizerswitches) { our induction variable strength reduction doesn't like for loops with more than one entry } and not(pi_has_label in current_procinfo.flags) then begin {RedoDFA:=}OptimizeInductionVariables(code); end; if cs_opt_nodecse in current_settings.optimizerswitches then do_optcse(code); { add implicit entry and exit code } add_entry_exit_code; { only do secondpass if there are no errors } if (ErrorCount=0) then begin create_codegen; { set the start offset to the start of the temp area in the stack } tg:=ttgobj.create; {$if defined(x86) or defined(arm)} { try to strip the stack frame } { set the framepointer to esp if: - no assembler directive, those are handled in assembler_block in pstatment.pas (for cases not caught by the Delphi exception below) - no exceptions are used - no pushes are used/esp modifications, could be: * outgoing parameters on the stack * incoming parameters on the stack * open arrays - no inline assembler or - Delphi mode - assembler directive - no pushes are used/esp modifications, could be: * outgoing parameters on the stack * incoming parameters on the stack * open arrays - no local variables } if ((po_assembler in procdef.procoptions) and (m_delphi in current_settings.modeswitches) and { localst at main_program_level is a staticsymtable } (procdef.localst.symtablelevel<>main_program_level) and (tabstractlocalsymtable(procdef.localst).count_locals = 0)) or ((cs_opt_stackframe in current_settings.optimizerswitches) and not(cs_generate_stackframes in current_settings.localswitches) and not(po_assembler in procdef.procoptions) and ((flags*[pi_has_assembler_block,pi_uses_exceptions,pi_is_assembler, pi_needs_implicit_finally,pi_has_implicit_finally,pi_has_stackparameter, pi_needs_stackframe])=[]) ) then begin { we need the parameter info here to determine if the procedure gets parameters on the stack calling generate_parameter_info doesn't hurt but it costs time (necessary to init para_stack_size) } generate_parameter_info; if not(procdef.stack_tainting_parameter(calleeside)) and not(has_assembler_child) and (para_stack_size=0) then begin { Only need to set the framepointer } framepointer:=NR_STACK_POINTER_REG; tg.direction:=1; end; end; {$endif} { Create register allocator } cg.init_register_allocators; set_first_temp_offset; generate_parameter_info; { allocate got register if needed } current_procinfo.allocate_got_register(aktproccode); { Allocate space in temp/registers for parast and localst } current_filepos:=entrypos; gen_alloc_symtable(aktproccode,procdef.parast); gen_alloc_symtable(aktproccode,procdef.localst); { Store temp offset for information about 'real' temps } tempstart:=tg.lasttemp; { Generate code to load register parameters in temps and insert local copies for values parameters. This must be done before the code for the body is generated because the localloc is updated. Note: The generated code will be inserted after the code generation of the body is finished, because only then the position is known } {$ifdef oldregvars} assign_regvars(code); {$endif oldreg} current_filepos:=entrypos; gen_load_para_value(templist); { caller paraloc info is also necessary in the stackframe_entry code of the ppc (and possibly other processors) } procdef.init_paraloc_info(callerside); { generate code for the node tree } do_secondpass(code); aktproccode.concatlist(current_asmdata.CurrAsmList); { The position of the loadpara_asmnode is now known } aktproccode.insertlistafter(loadpara_asmnode.currenttai,templist); { first generate entry and initialize code with the correct position and switches } current_filepos:=entrypos; current_settings.localswitches:=entryswitches; cg.set_regalloc_live_range_direction(rad_backwards); gen_entry_code(templist); aktproccode.insertlistafter(entry_asmnode.currenttai,templist); gen_initialize_code(templist); aktproccode.insertlistafter(init_asmnode.currenttai,templist); { now generate finalize and exit code with the correct position and switches } current_filepos:=exitpos; current_settings.localswitches:=exitswitches; cg.set_regalloc_live_range_direction(rad_forward); gen_finalize_code(templist); { the finalcode must be concated if there was no position available, using insertlistafter will result in an insert at the start when currentai=nil } if assigned(final_asmnode.currenttai) then aktproccode.insertlistafter(final_asmnode.currenttai,templist) else aktproccode.concatlist(templist); { insert exit label at the correct position } cg.a_label(templist,CurrExitLabel); if assigned(exitlabel_asmnode.currenttai) then aktproccode.insertlistafter(exitlabel_asmnode.currenttai,templist) else aktproccode.concatlist(templist); { exit code } gen_exit_code(templist); aktproccode.concatlist(templist); {$ifdef OLDREGVARS} { note: this must be done only after as much code as possible has } { been generated. The result is that when you ungetregister() a } { regvar, it will actually free the regvar (and alse free the } { the regvars at the same time). Doing this too early will } { confuse the register allocator, as the regvars will still be } { used. It should be done before loading the result regs (so } { they don't conflict with the regvars) and before } { gen_entry_code (that one has to be able to allocate the } { regvars again) (JM) } free_regvars(aktproccode); {$endif OLDREGVARS} { generate symbol and save end of header position } current_filepos:=entrypos; gen_proc_symbol(templist); headertai:=tai(templist.last); { insert symbol } aktproccode.insertlist(templist); { Free space in temp/registers for parast and localst, must be done after gen_entry_code } current_filepos:=exitpos; { make sure the got/pic register doesn't get freed in the } { middle of a loop } if (cs_create_pic in current_settings.moduleswitches) and (pi_needs_got in current_procinfo.flags) and (current_procinfo.got<>NR_NO) then cg.a_reg_sync(aktproccode,current_procinfo.got); gen_free_symtable(aktproccode,procdef.localst); gen_free_symtable(aktproccode,procdef.parast); { add code that will load the return value, this is not done for assembler routines when they didn't reference the result variable } gen_load_return_value(templist); aktproccode.concatlist(templist); { Already reserve all registers for stack checking code and generate the call to the helper function } if not(tf_no_generic_stackcheck in target_info.flags) and (cs_check_stack in entryswitches) and not(po_assembler in procdef.procoptions) and (procdef.proctypeoption<>potype_proginit) then begin current_filepos:=entrypos; gen_stack_check_call(templist); aktproccode.insertlistafter(stackcheck_asmnode.currenttai,templist) end; { this code (got loading) comes before everything which has } { already been generated, so reset the info about already } { backwards extended registers (so their live range can be } { extended backwards even further if needed) } { This code must be } { a) generated after do_secondpass has been called } { (because pi_needs_got may be set there) } { b) generated before register allocation, because the } { got/pic register can be a virtual one } { c) inserted before the entry code, because the entry } { code may need global symbols such as init rtti } { d) inserted after the stackframe allocation, because } { this register may have to be spilled } cg.set_regalloc_live_range_direction(rad_backwards_reinit); current_filepos:=entrypos; { load got if necessary } cg.g_maybe_got_init(templist); aktproccode.insertlistafter(headertai,templist); { re-enable if more code at the end is ever generated here cg.set_regalloc_live_range_direction(rad_forward); } { The procedure body is finished, we can now allocate the registers } cg.do_register_allocation(aktproccode,headertai); { translate imag. register to their real counter parts this is necessary for debuginfo and verbose assembler output when SSA will be implented, this will be more complicated because we've to maintain location lists } current_procinfo.procdef.parast.SymList.ForEachCall(@translate_registers,templist); current_procinfo.procdef.localst.SymList.ForEachCall(@translate_registers,templist); if (cs_create_pic in current_settings.moduleswitches) and (pi_needs_got in current_procinfo.flags) and not(cs_no_regalloc in current_settings.globalswitches) and (current_procinfo.got<>NR_NO) then cg.translate_register(current_procinfo.got); { Add save and restore of used registers } current_filepos:=entrypos; gen_save_used_regs(templist); { Remember the last instruction of register saving block (may be =nil for e.g. assembler procedures) } current_procinfo.endprologue_ai:=templist.last; aktproccode.insertlistafter(headertai,templist); current_filepos:=exitpos; gen_restore_used_regs(aktproccode); { We know the size of the stack, now we can generate the parameter that is passed to the stack checking code } if not(tf_no_generic_stackcheck in target_info.flags) and (cs_check_stack in entryswitches) and not(po_assembler in procdef.procoptions) and (procdef.proctypeoption<>potype_proginit) then begin current_filepos:=entrypos; gen_stack_check_size_para(templist); aktproccode.insertlistafter(stackcheck_asmnode.currenttai,templist) end; { Add entry code (stack allocation) after header } current_filepos:=entrypos; gen_proc_entry_code(templist); aktproccode.insertlistafter(headertai,templist); {$if defined(x86) or defined(arm)} { Set return value of safecall procedure if implicit try/finally blocks are disabled } if not (cs_implicit_exceptions in current_settings.moduleswitches) and (tf_safecall_exceptions in target_info.flags) and (procdef.proccalloption=pocall_safecall) then cg.a_load_const_reg(aktproccode,OS_ADDR,0,NR_FUNCTION_RETURN_REG); {$endif} { Add exit code at the end } current_filepos:=exitpos; gen_proc_exit_code(templist); aktproccode.concatlist(templist); { check if the implicit finally has been generated. The flag should already be set in pass1 } if (cs_implicit_exceptions in current_settings.moduleswitches) and not(procdef.proctypeoption in [potype_unitfinalize,potype_unitinit]) and (pi_needs_implicit_finally in flags) and not(pi_has_implicit_finally in flags) then internalerror(200405231); {$ifndef NoOpt} if not(cs_no_regalloc in current_settings.globalswitches) then begin if (cs_opt_level1 in current_settings.optimizerswitches) and { do not optimize pure assembler procedures } not(pi_is_assembler in flags) then optimize(aktproccode); end; {$endif NoOpt} {$ifdef ARM} { because of the limited constant size of the arm, all data access is done pc relative } finalizearmcode(aktproccode,aktlocaldata); {$endif ARM} {$ifdef AVR} { because of the limited branch distance of cond. branches, they must be replaced somtimes by normal jmps and an inverse branch } finalizeavrcode(aktproccode); {$endif AVR} { Add end symbol and debug info } { this must be done after the pcrelativedata is appended else the distance calculation of insertpcrelativedata will be wrong, further the pc indirect data is part of the procedure so it should be inserted before the end symbol (FK) } current_filepos:=exitpos; gen_proc_symbol_end(templist); aktproccode.concatlist(templist); {$if defined(POWERPC) or defined(POWERPC64)} fixup_jmps(aktproccode); {$endif} { insert line debuginfo } if (cs_debuginfo in current_settings.moduleswitches) or (cs_use_lineinfo in current_settings.globalswitches) then current_debuginfo.insertlineinfo(aktproccode); { add the procedure to the al_procedures } maybe_new_object_file(current_asmdata.asmlists[al_procedures]); new_section(current_asmdata.asmlists[al_procedures],sec_code,lower(procdef.mangledname),getprocalign); current_asmdata.asmlists[al_procedures].concatlist(aktproccode); { save local data (casetable) also in the same file } if assigned(aktlocaldata) and (not aktlocaldata.empty) then current_asmdata.asmlists[al_procedures].concatlist(aktlocaldata); { only now we can remove the temps } tg.resettempgen; { stop tempgen and ra } tg.free; cg.done_register_allocators; destroy_codegen; tg:=nil; end; dfabuilder.free; { restore symtablestack } remove_from_symtablestack; { restore } templist.free; current_settings.maxfpuregisters:=oldmaxfpuregisters; current_filepos:=oldfilepos; current_structdef:=old_current_structdef; current_procinfo:=old_current_procinfo; end; procedure tcgprocinfo.add_to_symtablestack; begin { insert symtables for the class, but only if it is no nested function } if assigned(procdef.struct) and not(assigned(parent) and assigned(parent.procdef) and assigned(parent.procdef.struct)) then push_nested_hierarchy(procdef.struct); { insert parasymtable in symtablestack when parsing a function } if procdef.parast.symtablelevel>=normal_function_level then symtablestack.push(procdef.parast); { insert localsymtable, except for the main procedure (in that case the localst is the unit's static symtable, which is already on the stack) } if procdef.localst.symtablelevel>=normal_function_level then symtablestack.push(procdef.localst); end; procedure tcgprocinfo.remove_from_symtablestack; begin { remove localsymtable } if procdef.localst.symtablelevel>=normal_function_level then symtablestack.pop(procdef.localst); { remove parasymtable } if procdef.parast.symtablelevel>=normal_function_level then symtablestack.pop(procdef.parast); { remove symtables for the class, but only if it is no nested function } if assigned(procdef.struct) and not(assigned(parent) and assigned(parent.procdef) and assigned(parent.procdef.struct)) then pop_nested_hierarchy(procdef.struct); end; procedure tcgprocinfo.resetprocdef; begin { remove code tree, if not inline procedure } if assigned(code) then begin { the inline procedure has already got a copy of the tree stored in procdef.inlininginfo } code.free; code:=nil; end; end; function checknodeinlining(procdef: tprocdef): boolean; var i : integer; currpara : tparavarsym; begin result := false; if (pi_has_assembler_block in current_procinfo.flags) then begin Message1(parser_w_not_supported_for_inline,'assembler'); Message(parser_w_inlining_disabled); exit; end; for i:=0 to procdef.paras.count-1 do begin currpara:=tparavarsym(procdef.paras[i]); case currpara.vardef.typ of formaldef : begin if (currpara.varspez in [vs_out,vs_var,vs_const,vs_constref]) then begin Message1(parser_w_not_supported_for_inline,'formal parameter'); Message(parser_w_inlining_disabled); exit; end; end; arraydef : begin if is_array_of_const(currpara.vardef) or is_variant_array(currpara.vardef) then begin Message1(parser_w_not_supported_for_inline,'array of const'); Message(parser_w_inlining_disabled); exit; end; { open arrays might need re-basing of the index, i.e. if you pass an array[1..10] as open array, you have to add 1 to all index operations if you directly inline it } if is_open_array(currpara.vardef) then begin Message1(parser_w_not_supported_for_inline,'open array'); Message(parser_w_inlining_disabled); exit; end; end; end; end; result:=true; end; procedure tcgprocinfo.parse_body; var old_current_procinfo : tprocinfo; old_block_type : tblock_type; st : TSymtable; old_current_structdef: tabstractrecorddef; old_current_genericdef, old_current_specializedef: tstoreddef; begin old_current_procinfo:=current_procinfo; old_block_type:=block_type; old_current_structdef:=current_structdef; old_current_genericdef:=current_genericdef; old_current_specializedef:=current_specializedef; current_procinfo:=self; current_structdef:=procdef.struct; if assigned(current_structdef) and (df_generic in current_structdef.defoptions) then current_genericdef:=current_structdef; if assigned(current_structdef) and (df_specialization in current_structdef.defoptions) then current_specializedef:=current_structdef; { calculate the lexical level } if procdef.parast.symtablelevel>maxnesting then Message(parser_e_too_much_lexlevel); block_type:=bt_body; {$ifdef state_tracking} { aktstate:=Tstate_storage.create;} {$endif state_tracking} { allocate the symbol for this procedure } alloc_proc_symbol(procdef); { add parast/localst to symtablestack } add_to_symtablestack; { save entry info } entrypos:=current_filepos; entryswitches:=current_settings.localswitches; if (df_generic in procdef.defoptions) then begin { start token recorder for generic template } procdef.initgeneric; current_scanner.startrecordtokens(procdef.generictokenbuf); end; { parse the code ... } code:=block(current_module.islibrary); if (df_generic in procdef.defoptions) then begin { stop token recorder for generic template } current_scanner.stoprecordtokens; { Give an error for accesses in the static symtable that aren't visible outside the current unit } st:=procdef.owner; while (st.symtabletype=ObjectSymtable) do st:=st.defowner.owner; if (pi_uses_static_symtable in flags) and (st.symtabletype<>staticsymtable) then Comment(V_Error,'Global Generic template references static symtable'); end; { save exit info } exitswitches:=current_settings.localswitches; exitpos:=last_endtoken_filepos; { the procedure is now defined } procdef.forwarddef:=false; if assigned(code) then begin { get a better entry point } entrypos:=code.fileinfo; { Finish type checking pass } do_typecheckpass(code); end; { Check for unused labels, forwards, symbols for procedures. Static symtable is checked in pmodules. The check must be done after the typecheckpass } if (Errorcount=0) and (tstoredsymtable(procdef.localst).symtabletype<>staticsymtable) then begin { check if forwards are resolved } tstoredsymtable(procdef.localst).check_forwards; { check if all labels are used } tstoredsymtable(procdef.localst).checklabels; { check for unused symbols, but only if there is no asm block } if not(pi_has_assembler_block in flags) then begin tstoredsymtable(procdef.localst).allsymbolsused; tstoredsymtable(procdef.parast).allsymbolsused; end; end; if (po_inline in procdef.procoptions) then begin { Can we inline this procedure? } if checknodeinlining(procdef) then begin new(procdef.inlininginfo); include(procdef.procoptions,po_has_inlininginfo); procdef.inlininginfo^.code:=code.getcopy; procdef.inlininginfo^.flags:=current_procinfo.flags; { The blocknode needs to set an exit label } if procdef.inlininginfo^.code.nodetype=blockn then include(procdef.inlininginfo^.code.flags,nf_block_with_exit); end; end; { Print the node to tree.log } if paraprintnodetree=1 then printproc( 'after parsing'); { ... remove symbol tables } remove_from_symtablestack; {$ifdef state_tracking} { aktstate.destroy;} {$endif state_tracking} current_structdef:=old_current_structdef; current_genericdef:=old_current_genericdef; current_specializedef:=old_current_specializedef; current_procinfo:=old_current_procinfo; { Restore old state } block_type:=old_block_type; end; {**************************************************************************** PROCEDURE/FUNCTION PARSING ****************************************************************************} procedure check_init_paras(p:TObject;arg:pointer); begin if tsym(p).typ<>paravarsym then exit; with tparavarsym(p) do if is_managed_type(vardef) and (varspez in [vs_value,vs_out]) then include(current_procinfo.flags,pi_do_call); end; procedure read_proc_body(old_current_procinfo:tprocinfo;pd:tprocdef); { Parses the procedure directives, then parses the procedure body, then generates the code for it } procedure do_generate_code(pi:tcgprocinfo); var hpi : tcgprocinfo; begin { generate code for this procedure } pi.generate_code; { process nested procs } hpi:=tcgprocinfo(pi.get_first_nestedproc); while assigned(hpi) do begin do_generate_code(hpi); hpi:=tcgprocinfo(hpi.next); end; pi.resetprocdef; end; var oldfailtokenmode : tmodeswitch; isnestedproc : boolean; begin Message1(parser_d_procedure_start,pd.fullprocname(false)); { create a new procedure } current_procinfo:=cprocinfo.create(old_current_procinfo); current_module.procinfo:=current_procinfo; current_procinfo.procdef:=pd; isnestedproc:=(current_procinfo.procdef.parast.symtablelevel>normal_function_level); { Insert mangledname } pd.aliasnames.insert(pd.mangledname); { Handle Export of this procedure } if (po_exports in pd.procoptions) and (target_info.system in [system_i386_os2,system_i386_emx]) then begin pd.aliasnames.insert(pd.procsym.realname); if cs_link_deffile in current_settings.globalswitches then deffile.AddExport(pd.mangledname); end; { Insert result variables in the localst } insert_funcret_local(pd); { check if there are para's which require initing -> set } { pi_do_call (if not yet set) } if not(pi_do_call in current_procinfo.flags) then pd.parast.SymList.ForEachCall(@check_init_paras,nil); { set _FAIL as keyword if constructor } if (pd.proctypeoption=potype_constructor) then begin oldfailtokenmode:=tokeninfo^[_FAIL].keyword; tokeninfo^[_FAIL].keyword:=m_all; end; tcgprocinfo(current_procinfo).parse_body; { We can't support inlining for procedures that have nested procedures because the nested procedures use a fixed offset for accessing locals in the parent procedure (PFV) } if current_procinfo.has_nestedprocs then begin if (df_generic in current_procinfo.procdef.defoptions) then Comment(V_Error,'Generic methods cannot have nested procedures') else if (po_inline in current_procinfo.procdef.procoptions) then begin Message1(parser_w_not_supported_for_inline,'nested procedures'); Message(parser_w_inlining_disabled); exclude(current_procinfo.procdef.procoptions,po_inline); end; end; { When it's a nested procedure then defer the code generation, when back at normal function level then generate the code for all defered nested procedures and the current procedure } if not isnestedproc then begin if not(df_generic in current_procinfo.procdef.defoptions) then do_generate_code(tcgprocinfo(current_procinfo)); end; { reset _FAIL as _SELF normal } if (pd.proctypeoption=potype_constructor) then tokeninfo^[_FAIL].keyword:=oldfailtokenmode; { release procinfo } if tprocinfo(current_module.procinfo)<>current_procinfo then internalerror(200304274); current_module.procinfo:=current_procinfo.parent; { For specialization we didn't record the last semicolon. Moving this parsing into the parse_body routine is not done because of having better file position information available } if not(df_specialization in current_procinfo.procdef.defoptions) then consume(_SEMICOLON); if not isnestedproc then { current_procinfo is checked for nil later on } freeandnil(current_procinfo); end; procedure read_proc(isclassmethod:boolean); { Parses the procedure directives, then parses the procedure body, then generates the code for it } var old_current_procinfo : tprocinfo; old_current_structdef: tabstractrecorddef; old_current_genericdef, old_current_specializedef: tstoreddef; pdflags : tpdflags; pd,firstpd : tprocdef; s : string; begin { save old state } old_current_procinfo:=current_procinfo; old_current_structdef:=current_structdef; old_current_genericdef:=current_genericdef; old_current_specializedef:=current_specializedef; { reset current_procinfo.procdef to nil to be sure that nothing is writing to another procdef } current_procinfo:=nil; current_structdef:=nil; current_genericdef:=nil; current_specializedef:=nil; { parse procedure declaration } pd:=parse_proc_dec(isclassmethod,old_current_structdef); { set the default function options } if parse_only then begin pd.forwarddef:=true; { set also the interface flag, for better error message when the implementation doesn't much this header } pd.interfacedef:=true; include(pd.procoptions,po_global); pdflags:=[pd_interface]; end else begin pdflags:=[pd_body]; if (not current_module.in_interface) then include(pdflags,pd_implemen); if (not current_module.is_unit) or create_smartlink or { taking addresses of static procedures goes wrong if they aren't global when pic is used (FK) } (cs_create_pic in current_settings.moduleswitches) then include(pd.procoptions,po_global); pd.forwarddef:=false; end; { parse the directives that may follow } parse_proc_directives(pd,pdflags); { hint directives, these can be separated by semicolons here, that needs to be handled here with a loop (PFV) } while try_consume_hintdirective(pd.symoptions,pd.deprecatedmsg) do Consume(_SEMICOLON); { Set calling convention } handle_calling_convention(pd); { search for forward declarations } if not proc_add_definition(pd) then begin { A method must be forward defined (in the object declaration) } if assigned(pd.struct) and (not assigned(old_current_structdef)) then begin MessagePos1(pd.fileinfo,parser_e_header_dont_match_any_member,pd.fullprocname(false)); tprocsym(pd.procsym).write_parameter_lists(pd); end else begin { Give a better error if there is a forward def in the interface and only a single implementation } firstpd:=tprocdef(tprocsym(pd.procsym).ProcdefList[0]); if (not pd.forwarddef) and (not pd.interfacedef) and (tprocsym(pd.procsym).ProcdefList.Count>1) and firstpd.forwarddef and firstpd.interfacedef and not(tprocsym(pd.procsym).ProcdefList.Count>2) and { don't give an error if it may be an overload } not(m_fpc in current_settings.modeswitches) and (not(po_overload in pd.procoptions) or not(po_overload in firstpd.procoptions)) then begin MessagePos1(pd.fileinfo,parser_e_header_dont_match_forward,pd.fullprocname(false)); tprocsym(pd.procsym).write_parameter_lists(pd); end; end; end; { Set mangled name } proc_set_mangledname(pd); { compile procedure when a body is needed } if (pd_body in pdflags) then begin read_proc_body(old_current_procinfo,pd); end else begin { Handle imports } if (po_external in pd.procoptions) then begin { External declared in implementation, and there was already a forward (or interface) declaration then we need to generate a stub that calls the external routine } if (not pd.forwarddef) and (pd.hasforward) { it is unclear to me what's the use of the following condition, so commented out, see also issue #18371 (FK) and not( assigned(pd.import_dll) and (target_info.system in [system_i386_wdosx, system_arm_wince,system_i386_wince]) ) } then begin s:=proc_get_importname(pd); if s<>'' then gen_external_stub(current_asmdata.asmlists[al_procedures],pd,s); end; { Import DLL specified? } if assigned(pd.import_dll) then begin if assigned (pd.import_name) then current_module.AddExternalImport(pd.import_dll^, pd.import_name^,proc_get_importname(pd), pd.import_nr,false,false) else current_module.AddExternalImport(pd.import_dll^, proc_get_importname(pd),proc_get_importname(pd), pd.import_nr,false,true); end else begin { add import name to external list for DLL scanning } if tf_has_dllscanner in target_info.flags then current_module.dllscannerinputlist.Add(proc_get_importname(pd),pd); end; end; end; { make sure that references to forward-declared functions are not } { treated as references to external symbols, needed for darwin. } { make sure we don't change the binding of real external symbols } if not(po_external in pd.procoptions) then begin if (po_global in pd.procoptions) or (cs_profile in current_settings.moduleswitches) then current_asmdata.DefineAsmSymbol(pd.mangledname,AB_GLOBAL,AT_FUNCTION) else current_asmdata.DefineAsmSymbol(pd.mangledname,AB_LOCAL,AT_FUNCTION); end; current_structdef:=old_current_structdef; current_genericdef:=old_current_genericdef; current_specializedef:=old_current_specializedef; current_procinfo:=old_current_procinfo; end; {**************************************************************************** DECLARATION PARSING ****************************************************************************} { search in symtablestack for not complete classes } procedure check_forward_class(p:TObject;arg:pointer); begin if (tsym(p).typ=typesym) and (ttypesym(p).typedef.typ=objectdef) and (oo_is_forward in tobjectdef(ttypesym(p).typedef).objectoptions) then MessagePos1(tsym(p).fileinfo,sym_e_forward_type_not_resolved,tsym(p).realname); end; procedure read_declarations(islibrary : boolean); var is_classdef:boolean; begin is_classdef:=false; repeat if not assigned(current_procinfo) then internalerror(200304251); case token of _LABEL: label_dec; _CONST: const_dec; _TYPE: type_dec; _VAR: var_dec; _THREADVAR: threadvar_dec; _CLASS: begin is_classdef:=false; if try_to_consume(_CLASS) then begin { class modifier is only allowed for procedures, functions, } { constructors, destructors, fields and properties } if not(token in [_FUNCTION,_PROCEDURE,_PROPERTY,_VAR,_CONSTRUCTOR,_DESTRUCTOR,_OPERATOR]) and not((token=_ID) and (idtoken=_OPERATOR)) then Message(parser_e_procedure_or_function_expected); if is_interface(current_structdef) then Message(parser_e_no_static_method_in_interfaces) else { class methods are also allowed for Objective-C protocols } is_classdef:=true; end; end; _CONSTRUCTOR, _DESTRUCTOR, _FUNCTION, _PROCEDURE, _OPERATOR: begin read_proc(is_classdef); is_classdef:=false; end; _EXPORTS: begin if (current_procinfo.procdef.localst.symtablelevel>main_program_level) then begin Message(parser_e_syntax_error); consume_all_until(_SEMICOLON); end else if islibrary or (target_info.system in systems_unit_program_exports) then read_exports else begin Message(parser_w_unsupported_feature); consume(_BEGIN); end; end else begin case idtoken of _RESOURCESTRING: begin { m_class is needed, because the resourcestring loading is in the ObjPas unit } { if (m_class in current_settings.modeswitches) then} resourcestring_dec { else break;} end; _OPERATOR: begin if is_classdef then begin read_proc(is_classdef); is_classdef:=false; end else break; end; _PROPERTY: begin if (m_fpc in current_settings.modeswitches) then begin property_dec(is_classdef); is_classdef:=false; end else break; end; else break; end; end; end; until false; { check for incomplete class definitions, this is only required for fpc modes } if (m_fpc in current_settings.modeswitches) then current_procinfo.procdef.localst.SymList.ForEachCall(@check_forward_class,nil); end; procedure read_interface_declarations; begin repeat case token of _CONST : const_dec; _TYPE : type_dec; _VAR : var_dec; _THREADVAR : threadvar_dec; _FUNCTION, _PROCEDURE, _OPERATOR : read_proc(false); else begin case idtoken of _RESOURCESTRING : resourcestring_dec; _PROPERTY: begin if (m_fpc in current_settings.modeswitches) then property_dec(false) else break; end; else break; end; end; end; until false; { check for incomplete class definitions, this is only required for fpc modes } if (m_fpc in current_settings.modeswitches) then symtablestack.top.SymList.ForEachCall(@check_forward_class,nil); end; {**************************************************************************** SPECIALIZATION BODY GENERATION ****************************************************************************} procedure specialize_objectdefs(p:TObject;arg:pointer); var i : longint; hp : tdef; oldcurrent_filepos : tfileposinfo; oldsymtablestack : tsymtablestack; oldextendeddefs : TFPHashObjectList; pu : tused_unit; hmodule : tmodule; specobj : tabstractrecorddef; begin if not((tsym(p).typ=typesym) and (ttypesym(p).typedef.typesym=tsym(p)) and (ttypesym(p).typedef.typ in [objectdef,recorddef]) and (df_specialization in ttypesym(p).typedef.defoptions) ) then exit; { Setup symtablestack a definition time } specobj:=tabstractrecorddef(ttypesym(p).typedef); if not (is_class_or_object(specobj) or is_record(specobj)) then exit; oldsymtablestack:=symtablestack; oldextendeddefs:=current_module.extendeddefs; current_module.extendeddefs:=TFPHashObjectList.create(true); symtablestack:=tdefawaresymtablestack.create; if not assigned(specobj.genericdef) then internalerror(200705151); hmodule:=find_module_from_symtable(specobj.genericdef.owner); if hmodule=nil then internalerror(200705152); pu:=tused_unit(hmodule.used_units.first); while assigned(pu) do begin if not assigned(pu.u.globalsymtable) then internalerror(200705153); symtablestack.push(pu.u.globalsymtable); pu:=tused_unit(pu.next); end; if assigned(hmodule.globalsymtable) then symtablestack.push(hmodule.globalsymtable); if assigned(hmodule.localsymtable) then symtablestack.push(hmodule.localsymtable); { procedure definitions for classes or objects } for i:=0 to specobj.symtable.DefList.Count-1 do begin hp:=tdef(specobj.symtable.DefList[i]); if hp.typ=procdef then begin if assigned(tprocdef(hp).genericdef) and (tprocdef(hp).genericdef.typ=procdef) and assigned(tprocdef(tprocdef(hp).genericdef).generictokenbuf) then begin oldcurrent_filepos:=current_filepos; current_filepos:=tprocdef(tprocdef(hp).genericdef).fileinfo; { use the index the module got from the current compilation process } current_filepos.moduleindex:=hmodule.unit_index; current_tokenpos:=current_filepos; current_scanner.startreplaytokens(tprocdef(tprocdef(hp).genericdef).generictokenbuf, tprocdef(tprocdef(hp).genericdef).change_endian); read_proc_body(nil,tprocdef(hp)); current_filepos:=oldcurrent_filepos; end else MessagePos1(tprocdef(hp).fileinfo,sym_e_forward_not_resolved,tprocdef(hp).fullprocname(false)); end; end; { Restore symtablestack } current_module.extendeddefs.free; current_module.extendeddefs:=oldextendeddefs; symtablestack.free; symtablestack:=oldsymtablestack; end; procedure generate_specialization_procs; begin if assigned(current_module.globalsymtable) then current_module.globalsymtable.SymList.ForEachCall(@specialize_objectdefs,nil); if assigned(current_module.localsymtable) then current_module.localsymtable.SymList.ForEachCall(@specialize_objectdefs,nil); end; end.