{ Copyright (c) 1998-2002 by Florian Klaempfl Generate assembler for call nodes 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 ncgcal; {$i fpcdefs.inc} interface uses cpubase, globtype, parabase,cgutils, aasmdata,cgbase, symdef,node,ncal; type tcgcallparanode = class(tcallparanode) protected function push_zero_sized_value_para: boolean; virtual; procedure push_addr_para; procedure push_value_para;virtual; procedure push_formal_para;virtual; procedure push_copyout_para;virtual;abstract; public tempcgpara : tcgpara; constructor create(expr,next : tnode);override; destructor destroy;override; procedure secondcallparan;override; end; { tcgcallnode } tcgcallnode = class(tcallnode) private procedure handle_return_value; procedure release_unused_return_value; procedure copy_back_paras; procedure release_para_temps; procedure reorder_parameters; procedure freeparas; protected retloc: tcgpara; paralocs: array of pcgpara; framepointer_paraloc : tcgpara; {# This routine is used to push the current frame pointer on the stack. This is used in nested routines where the value of the frame pointer is always pushed as an extra parameter. The default handling is the standard handling used on most stack based machines, where the frame pointer is the first invisible parameter. } procedure pop_parasize(pop_size:longint);virtual; procedure extra_interrupt_code;virtual; procedure extra_pre_call_code;virtual; procedure extra_call_code;virtual; procedure extra_post_call_code;virtual; function get_syscall_libbase_paraloc: pcgparalocation;virtual; procedure get_syscall_call_ref(out tmpref: treference; reg: tregister);virtual; procedure do_syscall;virtual;abstract; { The function result is returned in a tcgpara. This tcgpara has to be translated into a tlocation so the rest of the code generator can work with it. This routine decides what the most appropriate tlocation is and sets self.location based on that. } procedure set_result_location(realresdef: tstoreddef);virtual; { if an unused return value is in another location than a LOC_REFERENCE, this method will be called to perform the necessary cleanups. By default it does not do anything } procedure do_release_unused_return_value;virtual; { Override the following three methods to support calls to address in 'ref' without loading it into register (only x86 targets probably). If can_call_ref returns true, it should do required simplification on ref. } function can_call_ref(var ref: treference):boolean;virtual; procedure extra_call_ref_code(var ref: treference);virtual; function do_call_ref(ref: treference): tcgpara;virtual; { store all the parameters in the temporary paralocs in their final location, and create the paralocs array that will be passed to hlcg.a_call_* } procedure pushparas;virtual; { loads the code pointer of a complex procvar (one with a self/ parentfp/... and a procedure address) into a register and returns it } procedure load_complex_procvar_codeptr(out reg: tregister; out callprocdef: tabstractprocdef); virtual; { loads the procvar code pointer into a register with type def } procedure load_procvar_codeptr(out reg: tregister; out callprocdef: tabstractprocdef); procedure load_block_invoke(out toreg: tregister; out callprocdef: tabstractprocdef); function get_call_reg(list: TAsmList): tregister; virtual; procedure unget_call_reg(list: TAsmList; reg: tregister); virtual; public procedure pass_generate_code;override; destructor destroy;override; end; implementation uses systems, verbose,globals, symconst,symtable,symtype,symsym,defutil,paramgr, pass_2, nld,ncnv, ncgutil,blockutl, cgobj,tgobj,hlcgobj, procinfo, wpobase; {***************************************************************************** TCGCALLPARANODE *****************************************************************************} constructor tcgcallparanode.create(expr,next : tnode); begin inherited create(expr,next); tempcgpara.init; end; destructor tcgcallparanode.destroy; begin tempcgpara.done; inherited destroy; end; function tcgcallparanode.push_zero_sized_value_para: boolean; begin { nothing to push by default } result:=false; end; procedure tcgcallparanode.push_addr_para; var valuedef: tdef; begin if not(left.location.loc in [LOC_CREFERENCE,LOC_REFERENCE]) then internalerror(200304235); { see the call to keep_para_array_range in ncal: if that call returned true, we overwrite the resultdef of left with its original resultdef (to keep track of the range of the original array); we inserted a type conversion to parasym.vardef, so that is the type this value actually has } if is_dynamic_array(left.resultdef) and is_open_array(parasym.vardef) then valuedef:=parasym.vardef else valuedef:=left.resultdef; hlcg.a_loadaddr_ref_cgpara(current_asmdata.CurrAsmList,valuedef,left.location.reference,tempcgpara); end; procedure tcgcallnode.reorder_parameters; var hpcurr,hpprev,hpnext,hpreversestart : tcgcallparanode; begin { All parameters are now in temporary locations. If we move them to their regular locations in the same order, then we get the following pattern for register parameters: mov para1, tempreg1 mov para2, tempreg2 mov para3, tempreg3 mov tempreg1, parareg1 mov tempreg2, parareg2 mov tempreg3, parareg3 The result is that all tempregs conflict with all pararegs. A better solution is to use: mov para1, tempreg1 mov para2, tempreg2 mov para3, tempreg3 mov tempreg3, parareg3 mov tempreg2, parareg2 mov tempreg1, parareg1 This way, tempreg2 can be the same as parareg1 etc. To achieve this, we invert the order of all LOC_XREGISTER paras (JM). } hpcurr:=tcgcallparanode(left); { assume all LOC_REFERENCE parameters come first (see tcallnode.order_parameters) } hpreversestart:=nil; while assigned(hpcurr) do begin if not(hpcurr.parasym.paraloc[callerside].location^.loc in [LOC_REFERENCE,LOC_CREFERENCE]) then hpreversestart:=hpcurr; hpcurr:=tcgcallparanode(hpcurr.right); end; { since all register tempparalocs have basically a complexity of 1, (unless there are large stack offsets that require a temp register on some architectures, but that's minor), we don't have to care about the internal relative order of different register type parameters } hpprev:=nil; hpcurr:=tcgcallparanode(left); while (hpcurr<>hpreversestart) do begin hpnext:=tcgcallparanode(hpcurr.right); if not(hpcurr.parasym.paraloc[callerside].location^.loc in [LOC_REFERENCE,LOC_CREFERENCE]) then begin { remove hpcurr from chain } if assigned(hpprev) then hpprev.right:=hpnext else left:=hpnext; { insert right after hpreversestart, so every element will be inserted right before the previously moved one -> reverse order; hpreversestart itself is the last register parameter } hpcurr.right:=hpreversestart.right; hpreversestart.right:=hpcurr; end else hpprev:=hpcurr; hpcurr:=hpnext; end; end; procedure tcgcallparanode.push_value_para; begin { we've nothing to push when the size of the parameter is 0 -- except on platforms where the parameters are part of the signature and checked by the runtime/backend compiler (e.g. JVM, LLVM) } if (left.resultdef.size=0) and not push_zero_sized_value_para then exit; { Move flags and jump in register to make it less complex } if left.location.loc in [LOC_FLAGS,LOC_JUMP,LOC_SUBSETREG,LOC_CSUBSETREG,LOC_SUBSETREF,LOC_CSUBSETREF] then hlcg.location_force_reg(current_asmdata.CurrAsmList,left.location,left.resultdef,left.resultdef,false); { load the parameter's tlocation into its cgpara } hlcg.gen_load_loc_cgpara(current_asmdata.CurrAsmList,left.resultdef,left.location,tempcgpara) end; procedure tcgcallparanode.push_formal_para; begin { allow passing of a constant to a const formaldef } if (parasym.varspez=vs_const) and (left.location.loc in [LOC_CONSTANT,LOC_REGISTER]) then hlcg.location_force_mem(current_asmdata.CurrAsmList,left.location,left.resultdef); push_addr_para; end; procedure tcgcallparanode.secondcallparan; var pushaddr: boolean; begin if not(assigned(parasym)) then internalerror(200304242); { Skip nothingn nodes which are used after disabling a parameter } if (left.nodetype<>nothingn) then begin if assigned(fparainit) then secondpass(fparainit); secondpass(left); hlcg.maybe_change_load_node_reg(current_asmdata.CurrAsmList,left,true); paramanager.createtempparaloc(current_asmdata.CurrAsmList,aktcallnode.procdefinition.proccalloption,parasym,not followed_by_stack_tainting_call_cached,tempcgpara); { handle varargs first, because parasym is not valid } if (cpf_varargs_para in callparaflags) then begin if paramanager.push_addr_param(vs_value,left.resultdef, aktcallnode.procdefinition.proccalloption) then push_addr_para else push_value_para; end { hidden parameters } else if (vo_is_hidden_para in parasym.varoptions) then begin { don't push a node that already generated a pointer type by address for implicit hidden parameters } pushaddr:=(vo_is_funcret in parasym.varoptions) or { pass "this" in C++ classes explicitly as pointer because push_addr_param might not be true for them } (is_cppclass(parasym.vardef) and (vo_is_self in parasym.varoptions)) or ( ( not(left.resultdef.typ in [pointerdef,classrefdef]) or ( { allow pointerdefs (as self) to be passed as addr param if the method is part of a type helper which extends a pointer type } (vo_is_self in parasym.varoptions) and (aktcallnode.procdefinition.owner.symtabletype=objectsymtable) and (is_objectpascal_helper(tdef(aktcallnode.procdefinition.owner.defowner))) and (tobjectdef(aktcallnode.procdefinition.owner.defowner).extendeddef.typ=pointerdef) ) ) and paramanager.push_addr_param(parasym.varspez,parasym.vardef, aktcallnode.procdefinition.proccalloption)); if pushaddr then begin { objects or advanced records could be located in registers if they are the result of a type case, see e.g. webtbs\tw26075.pp } if not(left.location.loc in [LOC_CREFERENCE,LOC_REFERENCE]) then hlcg.location_force_mem(current_asmdata.CurrAsmList,left.location,left.resultdef); push_addr_para end else push_value_para; end { formal def } else if (parasym.vardef.typ=formaldef) then push_formal_para { Normal parameter } else if paramanager.push_copyout_param(parasym.varspez,parasym.vardef, aktcallnode.procdefinition.proccalloption) then push_copyout_para else begin { don't push a node that already generated a pointer type by address for implicit hidden parameters } if (not( (vo_is_hidden_para in parasym.varoptions) and (left.resultdef.typ in [pointerdef,classrefdef]) ) and paramanager.push_addr_param(parasym.varspez,parasym.vardef, aktcallnode.procdefinition.proccalloption)) and { dyn. arrays passed to an array of const must be passed by value, see tests/webtbs/tw4219.pp } not( is_array_of_const(parasym.vardef) and is_dynamic_array(left.resultdef) ) then begin { Passing a var parameter to a var parameter, we can just push the address transparently } if (left.nodetype=loadn) and (tloadnode(left).is_addr_param_load) then begin if (left.location.reference.index<>NR_NO) or (left.location.reference.offset<>0) then internalerror(200410107); hlcg.a_load_reg_cgpara(current_asmdata.CurrAsmList,cpointerdef.getreusable(left.resultdef),left.location.reference.base,tempcgpara) end else begin { Force to be in memory } if not(left.location.loc in [LOC_CREFERENCE,LOC_REFERENCE]) then hlcg.location_force_mem(current_asmdata.CurrAsmList,left.location,left.resultdef); push_addr_para; end; end else push_value_para; end; { update return location in callnode when this is the function result } if assigned(parasym) and ( { for type helper/record constructor check that it is self parameter } ( (vo_is_self in parasym.varoptions) and (aktcallnode.procdefinition.proctypeoption=potype_constructor) and (parasym.vardef.typ<>objectdef) ) or (vo_is_funcret in parasym.varoptions) ) then location_copy(aktcallnode.location,left.location); end; { next parameter } if assigned(right) then tcallparanode(right).secondcallparan; end; {***************************************************************************** TCGCALLNODE *****************************************************************************} {$if first_mm_imreg = 0} {$WARN 4044 OFF} { Comparison might be always false ... } {$endif} procedure tcgcallnode.extra_interrupt_code; begin end; procedure tcgcallnode.extra_pre_call_code; begin end; procedure tcgcallnode.extra_call_code; begin end; procedure tcgcallnode.extra_post_call_code; begin end; function tcgcallnode.get_syscall_libbase_paraloc: pcgparalocation; var hsym: tsym; begin hsym:=tsym(procdefinition.parast.Find('syscalllib')); if not assigned(hsym) then internalerror(2016110605); result:=tparavarsym(hsym).paraloc[callerside].location; if not assigned(result) then internalerror(2016110604); end; procedure tcgcallnode.get_syscall_call_ref(out tmpref: treference; reg: tregister); var libparaloc: pcgparalocation; begin libparaloc:=get_syscall_libbase_paraloc; case libparaloc^.loc of LOC_REGISTER: reference_reset_base(tmpref,libparaloc^.register,-tprocdef(procdefinition).extnumber,ctempposinvalid,sizeof(pint),[]); LOC_REFERENCE: begin reference_reset_base(tmpref,libparaloc^.reference.index,libparaloc^.reference.offset,ctempposinvalid,sizeof(pint),[]); cg.a_load_ref_reg(current_asmdata.CurrAsmList,OS_ADDR,OS_ADDR,tmpref,reg); reference_reset_base(tmpref,reg,-tprocdef(procdefinition).extnumber,ctempposinvalid,sizeof(pint),[]); end; else begin reference_reset(tmpref,0,[]); internalerror(2016090202); end; end; end; function tcgcallnode.can_call_ref(var ref: treference): boolean; begin result:=false; end; procedure tcgcallnode.extra_call_ref_code(var ref: treference); begin { no action by default } end; function tcgcallnode.do_call_ref(ref: treference): tcgpara; begin InternalError(2014012901); { silence warning } result.init; end; procedure tcgcallnode.load_block_invoke(out toreg: tregister; out callprocdef: tabstractprocdef); var href: treference; literaldef: trecorddef; begin literaldef:=get_block_literal_type_for_proc(tabstractprocdef(right.resultdef)); hlcg.location_force_reg(current_asmdata.CurrAsmList,right.location,right.resultdef,cpointerdef.getreusable(literaldef),true); { load the invoke pointer } hlcg.reference_reset_base(href,right.resultdef,right.location.register,0,ctempposinvalid,right.resultdef.alignment,[]); callprocdef:=cprocvardef.getreusableprocaddr(procdefinition); toreg:=hlcg.getaddressregister(current_asmdata.CurrAsmList,callprocdef); hlcg.g_load_field_reg_by_name(current_asmdata.CurrAsmList,literaldef,callprocdef,'INVOKE',href,toreg); end; function tcgcallnode.get_call_reg(list: TAsmList): tregister; begin result:=hlcg.getaddressregister(current_asmdata.CurrAsmList,procdefinition.address_type); end; procedure tcgcallnode.unget_call_reg(list: TAsmList; reg: tregister); begin { nothing to do by default } end; procedure tcgcallnode.set_result_location(realresdef: tstoreddef); begin if realresdef.is_intregable or realresdef.is_fpuregable or { avoid temporarily storing pointer-sized entities that can't be regvars, such as reference-counted pointers, to memory -- no exception can occur right now (except in case of existing memory corruption), and we'd store them to a regular temp anyway and that is not safer than keeping them in a register } ((realresdef.size=sizeof(aint)) and (retloc.location^.loc=LOC_REGISTER) and not assigned(retloc.location^.next)) then location_allocate_register(current_asmdata.CurrAsmList,location,realresdef,false) else begin location_reset_ref(location,LOC_REFERENCE,def_cgsize(realresdef),0,[]); tg.gethltemp(current_asmdata.CurrAsmList,realresdef,retloc.intsize,tt_normal,location.reference); end; end; procedure tcgcallnode.do_release_unused_return_value; begin case location.loc of LOC_REFERENCE : begin if is_managed_type(resultdef) then hlcg.g_finalize(current_asmdata.CurrAsmList,resultdef,location.reference); tg.ungetiftemp(current_asmdata.CurrAsmList,location.reference); end; end; end; procedure tcgcallnode.pop_parasize(pop_size:longint); begin end; procedure tcgcallnode.handle_return_value; var realresdef: tstoreddef; begin { Check that the return location is set when the result is passed in a parameter } if paramanager.ret_in_param(resultdef,procdefinition) then begin { self.location is set near the end of secondcallparan so it refers to the implicit result parameter } if location.loc<>LOC_REFERENCE then internalerror(200304241); exit; end; if not assigned(typedef) then realresdef:=tstoreddef(resultdef) else realresdef:=tstoreddef(typedef); { get a tlocation that can hold the return value that's currently in the return value's tcgpara } set_result_location(realresdef); { Do not move the physical register to a virtual one in case the return value is not used, because if the virtual one is then mapped to the same register as the physical one, we will end up with two deallocs of this register (one inserted here, one inserted by the register allocator), which unbalances the register allocation information. The return register(s) will be freed by location_free() in release_unused_return_value (mantis #13536). } if (cnf_return_value_used in callnodeflags) or assigned(funcretnode) then hlcg.gen_load_cgpara_loc(current_asmdata.CurrAsmList,realresdef,retloc,location,false); { copy value to the final location if this was already provided to the callnode. This must be done after the call node, because the location can also be used as parameter and may not be finalized yet } if assigned(funcretnode) then begin funcretnode.pass_generate_code; { Decrease refcount for refcounted types, this can be skipped when we have used a temp, because then it is already done from tempcreatenode. Also no finalize is needed, because there is no risk of exceptions from the function since this is code is only executed after the function call has returned } if is_managed_type(funcretnode.resultdef) and (funcretnode.nodetype<>temprefn) then hlcg.g_finalize(current_asmdata.CurrAsmList,funcretnode.resultdef,funcretnode.location.reference); case location.loc of LOC_REGISTER : begin {$ifndef cpu64bitalu} if location.size in [OS_64,OS_S64] then cg64.a_load64_reg_loc(current_asmdata.CurrAsmList,location.register64,funcretnode.location) else {$endif} hlcg.a_load_reg_loc(current_asmdata.CurrAsmList,resultdef,resultdef,location.register,funcretnode.location); location_free(current_asmdata.CurrAsmList,location); end; LOC_REFERENCE: begin case funcretnode.location.loc of LOC_REGISTER: hlcg.a_load_ref_reg(current_asmdata.CurrAsmList,resultdef,resultdef,location.reference,funcretnode.location.register); LOC_REFERENCE: hlcg.g_concatcopy(current_asmdata.CurrAsmList,resultdef,location.reference,funcretnode.location.reference); else internalerror(200802121); end; location_freetemp(current_asmdata.CurrAsmList,location); end; else internalerror(200709085); end; location := funcretnode.location; end; end; procedure tcgcallnode.release_unused_return_value; begin { When the result is not used we need to finalize the result and can release the temp. This need to be after the callcleanupblock tree is generated, because that converts the temp from persistent to normal } if not(cnf_return_value_used in callnodeflags) then begin do_release_unused_return_value; if (retloc.intsize<>0) then paramanager.freecgpara(current_asmdata.CurrAsmList,retloc); location_reset(location,LOC_VOID,OS_NO); end; end; procedure tcgcallnode.copy_back_paras; var ppn : tcallparanode; begin ppn:=tcallparanode(left); while assigned(ppn) do begin if assigned(ppn.paracopyback) then secondpass(ppn.paracopyback); ppn:=tcallparanode(ppn.right); end; end; procedure tcgcallnode.release_para_temps; var hp, hp2 : tnode; ppn : tcallparanode; begin { Release temps from parameters } ppn:=tcallparanode(left); while assigned(ppn) do begin if assigned(ppn.left) then begin { don't release the funcret temp } if not(assigned(ppn.parasym)) or not( (vo_is_funcret in ppn.parasym.varoptions) or ( (vo_is_self in ppn.parasym.varoptions) and (procdefinition.proctypeoption=potype_constructor) and (ppn.parasym.vardef.typ<>objectdef) ) )then location_freetemp(current_asmdata.CurrAsmList,ppn.left.location); { process also all nodes of an array of const } hp:=ppn.left; while (hp.nodetype=typeconvn) do hp:=ttypeconvnode(hp).left; if (hp.nodetype=arrayconstructorn) and assigned(tarrayconstructornode(hp).left) then begin while assigned(hp) do begin hp2:=tarrayconstructornode(hp).left; { ignore typeconvs and addrn inserted by arrayconstructn for passing a shortstring } if (hp2.nodetype=typeconvn) and (tunarynode(hp2).left.nodetype=addrn) then hp2:=tunarynode(tunarynode(hp2).left).left else if hp2.nodetype=addrn then hp2:=tunarynode(hp2).left; location_freetemp(current_asmdata.CurrAsmList,hp2.location); hp:=tarrayconstructornode(hp).right; end; end; end; ppn:=tcallparanode(ppn.right); end; setlength(paralocs,0); end; procedure tcgcallnode.pushparas; var ppn : tcgcallparanode; callerparaloc, tmpparaloc : pcgparalocation; sizeleft: aint; htempref, href : treference; calleralignment, tmpalignment, i: longint; skipiffinalloc: boolean; begin { copy all resources to the allocated registers } ppn:=tcgcallparanode(left); while assigned(ppn) do begin if (ppn.left.nodetype<>nothingn) then begin { better check for the real location of the parameter here, when stack passed parameters are saved temporary in registers, checking for the tmpparaloc.loc is wrong } paramanager.freecgpara(current_asmdata.CurrAsmList,ppn.tempcgpara); tmpparaloc:=ppn.tempcgpara.location; sizeleft:=ppn.tempcgpara.intsize; calleralignment:=ppn.parasym.paraloc[callerside].alignment; tmpalignment:=ppn.tempcgpara.alignment; if (tmpalignment=0) or (calleralignment=0) then internalerror(2009020701); callerparaloc:=ppn.parasym.paraloc[callerside].location; skipiffinalloc:= not paramanager.use_fixed_stack or not(ppn.followed_by_stack_tainting_call_cached); while assigned(callerparaloc) do begin { Every paraloc must have a matching tmpparaloc } if not assigned(tmpparaloc) then internalerror(200408224); if callerparaloc^.size<>tmpparaloc^.size then internalerror(200408225); case callerparaloc^.loc of LOC_REGISTER: begin if tmpparaloc^.loc<>LOC_REGISTER then internalerror(200408221); if getsupreg(callerparaloc^.register)LOC_FPUREGISTER then internalerror(200408222); if getsupreg(callerparaloc^.register)LOC_MMREGISTER then internalerror(200408223); if getsupreg(callerparaloc^.register)LOC_REFERENCE) or assigned(tmpparaloc^.next)) then internalerror(200501281); reference_reset_base(href,callerparaloc^.reference.index,callerparaloc^.reference.offset,ctempposinvalid,calleralignment,[]); { copy parameters in case they were moved to a temp. location because we've a fixed stack } case tmpparaloc^.loc of LOC_REFERENCE: begin reference_reset_base(htempref,tmpparaloc^.reference.index,tmpparaloc^.reference.offset,ctempposinvalid,tmpalignment,[]); { use concatcopy, because it can also be a float which fails when load_ref_ref is used } if (ppn.tempcgpara.size <> OS_NO) then cg.g_concatcopy(current_asmdata.CurrAsmList,htempref,href,tcgsize2size[tmpparaloc^.size]) else cg.g_concatcopy(current_asmdata.CurrAsmList,htempref,href,sizeleft) end; LOC_REGISTER: cg.a_load_reg_ref(current_asmdata.CurrAsmList,tmpparaloc^.size,tmpparaloc^.size,tmpparaloc^.register,href); LOC_FPUREGISTER: cg.a_loadfpu_reg_ref(current_asmdata.CurrAsmList,tmpparaloc^.size,tmpparaloc^.size,tmpparaloc^.register,href); LOC_MMREGISTER: cg.a_loadmm_reg_ref(current_asmdata.CurrAsmList,tmpparaloc^.size,tmpparaloc^.size,tmpparaloc^.register,href,mms_movescalar); else internalerror(200402081); end; end; end; end; dec(sizeleft,tcgsize2size[tmpparaloc^.size]); callerparaloc:=callerparaloc^.next; tmpparaloc:=tmpparaloc^.next; end; end; ppn:=tcgcallparanode(ppn.right); end; setlength(paralocs,procdefinition.paras.count); for i:=0 to procdefinition.paras.count-1 do paralocs[i]:=@tparavarsym(procdefinition.paras[i]).paraloc[callerside]; end; procedure tcgcallnode.load_complex_procvar_codeptr(out reg: tregister; out callprocdef: tabstractprocdef); var srcreg: tregister; begin { this is safe even on i8086, because procvardef code pointers are always far there (so the current state of far calls vs the state of far calls where the procvardef was defined does not matter, even though the procvardef constructor called by getcopyas looks at it) } callprocdef:=cprocvardef.getreusableprocaddr(procdefinition); reg:=hlcg.getaddressregister(current_asmdata.CurrAsmList,callprocdef); { in case we have a method pointer on a big endian target in registers, the method address is stored in registerhi (it's the first field in the tmethod record) } if (right.location.loc in [LOC_REGISTER,LOC_CREGISTER]) then begin if not(right.location.size in [OS_PAIR,OS_SPAIR]) then internalerror(2014081401); if (target_info.endian=endian_big) then srcreg:=right.location.registerhi else srcreg:=right.location.register; hlcg.a_load_reg_reg(current_asmdata.CurrAsmList,callprocdef,callprocdef,srcreg,reg) end else begin hlcg.location_force_mem(current_asmdata.CurrAsmList,right.location,procdefinition); hlcg.g_ptrtypecast_ref(current_asmdata.CurrAsmList,cpointerdef.getreusable(procdefinition),cpointerdef.getreusable(callprocdef),right.location.reference); hlcg.a_load_ref_reg(current_asmdata.CurrAsmList,callprocdef,callprocdef,right.location.reference,reg); end; end; procedure tcgcallnode.load_procvar_codeptr(out reg: tregister; out callprocdef: tabstractprocdef); begin if po_is_block in procdefinition.procoptions then load_block_invoke(reg,callprocdef) else if not(procdefinition.is_addressonly) then load_complex_procvar_codeptr(reg,callprocdef) else begin reg:=hlcg.getaddressregister(current_asmdata.CurrAsmList,procdefinition); hlcg.a_load_loc_reg(current_asmdata.CurrAsmList,procdefinition,procdefinition,right.location,reg); callprocdef:=procdefinition; end; callprocdef.init_paraloc_info(callerside); end; procedure tcgcallnode.freeparas; var ppn : tcgcallparanode; begin { free the resources allocated for the parameters } ppn:=tcgcallparanode(left); while assigned(ppn) do begin if (ppn.left.nodetype<>nothingn) then begin if (ppn.parasym.paraloc[callerside].location^.loc <> LOC_REFERENCE) then paramanager.freecgpara(current_asmdata.CurrAsmList,ppn.parasym.paraloc[callerside]); end; ppn:=tcgcallparanode(ppn.right); end; end; procedure tcgcallnode.pass_generate_code; var name_to_call: TSymStr; regs_to_save_int, regs_to_save_address, regs_to_save_fpu, regs_to_save_mm : Tcpuregisterset; href : treference; pop_size : longint; pvreg : tregister; oldaktcallnode : tcallnode; retlocitem: pcgparalocation; callpvdef: tabstractprocdef; pd : tprocdef; callref: boolean; {$ifdef vtentry} sym : tasmsymbol; vmtoffset : aint; {$endif vtentry} {$ifdef SUPPORT_SAFECALL} cgpara : tcgpara; {$endif} begin if not assigned(procdefinition) or not(procdefinition.has_paraloc_info in [callerside,callbothsides]) then internalerror(200305264); extra_pre_call_code; if assigned(callinitblock) then secondpass(tnode(callinitblock)); regs_to_save_int:=paramanager.get_volatile_registers_int(procdefinition.proccalloption); regs_to_save_address:=paramanager.get_volatile_registers_address(procdefinition.proccalloption); regs_to_save_fpu:=paramanager.get_volatile_registers_fpu(procdefinition.proccalloption); regs_to_save_mm:=paramanager.get_volatile_registers_mm(procdefinition.proccalloption); { Include Function result registers } if (not is_void(resultdef)) then begin { The forced returntype may have a different size than the one declared for the procdef } retloc:=hlcg.get_call_result_cgpara(procdefinition,typedef); retlocitem:=retloc.location; while assigned(retlocitem) do begin case retlocitem^.loc of LOC_REGISTER: case getregtype(retlocitem^.register) of R_INTREGISTER: include(regs_to_save_int,getsupreg(retlocitem^.register)); R_ADDRESSREGISTER: include(regs_to_save_address,getsupreg(retlocitem^.register)); R_TEMPREGISTER: ; else internalerror(2014020102); end; LOC_FPUREGISTER: include(regs_to_save_fpu,getsupreg(retlocitem^.register)); LOC_MMREGISTER: include(regs_to_save_mm,getsupreg(retlocitem^.register)); LOC_REFERENCE, LOC_VOID: ; else internalerror(2004110213); end; retlocitem:=retlocitem^.next; end; end; { Process parameters, register parameters will be loaded in imaginary registers. The actual load to the correct register is done just before the call } oldaktcallnode:=aktcallnode; aktcallnode:=self; if assigned(left) then tcallparanode(left).secondcallparan; aktcallnode:=oldaktcallnode; { procedure variable or normal function call ? } if (right=nil) then begin { register call for WPO (must be done before wpo test below, otherwise optimised called methods are no longer registered) } if (po_virtualmethod in procdefinition.procoptions) and not is_objectpascal_helper(tprocdef(procdefinition).struct) and assigned(methodpointer) and (methodpointer.nodetype<>typen) and (not assigned(current_procinfo) or wpoinfomanager.symbol_live(current_procinfo.procdef.mangledname)) then tobjectdef(tprocdef(procdefinition).struct).register_vmt_call(tprocdef(procdefinition).extnumber); {$ifdef vtentry} if not is_interface(tprocdef(procdefinition)._class) then begin inc(current_asmdata.NextVTEntryNr); current_asmdata.CurrAsmList.Concat(tai_symbol.CreateName('VTREF'+tostr(current_asmdata.NextVTEntryNr)+'_'+tprocdef(procdefinition).struct.vmt_mangledname+'$$'+tostr(vmtoffset div sizeof(pint)),AT_FUNCTION,0,voidpointerdef)); end; {$endif vtentry} name_to_call:=forcedprocname; { When methodpointer is typen we don't need (and can't) load a pointer. We can directly call the correct procdef (PFV) } if (name_to_call='') and (po_virtualmethod in procdefinition.procoptions) and not is_objectpascal_helper(tprocdef(procdefinition).struct) and assigned(methodpointer) and (methodpointer.nodetype<>typen) and not wpoinfomanager.can_be_devirtualized(methodpointer.resultdef,procdefinition,name_to_call) then begin { virtual methods require an index } if tprocdef(procdefinition).extnumber=$ffff then internalerror(200304021); { load the VMT entry (address of the virtual method) } secondpass(vmt_entry); { register call for WPO } if (not assigned(current_procinfo) or wpoinfomanager.symbol_live(current_procinfo.procdef.mangledname)) then tobjectdef(tprocdef(procdefinition).struct).register_vmt_call(tprocdef(procdefinition).extnumber); if not(vmt_entry.location.loc in [LOC_REFERENCE,LOC_CREFERENCE]) then internalerror(2015052502); href:=vmt_entry.location.reference; pvreg:=NR_NO; callref:=can_call_ref(href); if not callref then begin pvreg:=get_call_reg(current_asmdata.CurrAsmList); hlcg.a_load_ref_reg(current_asmdata.CurrAsmList, vmt_entry.resultdef,vmt_entry.resultdef, href,pvreg); end; { Load parameters that are in temporary registers in the correct parameter register } if assigned(left) then begin reorder_parameters; pushparas; { free the resources allocated for the parameters } freeparas; end; if callref then extra_call_ref_code(href); cg.alloccpuregisters(current_asmdata.CurrAsmList,R_INTREGISTER,regs_to_save_int); if cg.uses_registers(R_ADDRESSREGISTER) then cg.alloccpuregisters(current_asmdata.CurrAsmList,R_ADDRESSREGISTER,regs_to_save_address); if cg.uses_registers(R_FPUREGISTER) then cg.alloccpuregisters(current_asmdata.CurrAsmList,R_FPUREGISTER,regs_to_save_fpu); if cg.uses_registers(R_MMREGISTER) then cg.alloccpuregisters(current_asmdata.CurrAsmList,R_MMREGISTER,regs_to_save_mm); { call method } extra_call_code; retloc.resetiftemp; if callref then retloc:=do_call_ref(href) else begin hlcg.g_ptrtypecast_reg(current_asmdata.CurrAsmList,vmt_entry.resultdef,cpointerdef.getreusable(procdefinition),pvreg); retloc:=hlcg.a_call_reg(current_asmdata.CurrAsmList,tabstractprocdef(procdefinition),pvreg,paralocs); unget_call_reg(current_asmdata.CurrAsmList,pvreg); end; extra_post_call_code; end else begin { Load parameters that are in temporary registers in the correct parameter register } if assigned(left) then begin reorder_parameters; pushparas; { free the resources allocated for the parameters } freeparas; end; cg.alloccpuregisters(current_asmdata.CurrAsmList,R_INTREGISTER,regs_to_save_int); if cg.uses_registers(R_ADDRESSREGISTER) then cg.alloccpuregisters(current_asmdata.CurrAsmList,R_ADDRESSREGISTER,regs_to_save_address); if cg.uses_registers(R_FPUREGISTER) then cg.alloccpuregisters(current_asmdata.CurrAsmList,R_FPUREGISTER,regs_to_save_fpu); if cg.uses_registers(R_MMREGISTER) then cg.alloccpuregisters(current_asmdata.CurrAsmList,R_MMREGISTER,regs_to_save_mm); if procdefinition.proccalloption=pocall_syscall then do_syscall else begin { Calling interrupt from the same code requires some extra code } if (po_interrupt in procdefinition.procoptions) then extra_interrupt_code; extra_call_code; retloc.resetiftemp; if (name_to_call='') then name_to_call:=tprocdef(procdefinition).mangledname; if cnf_inherited in callnodeflags then retloc:=hlcg.a_call_name_inherited(current_asmdata.CurrAsmList,tprocdef(procdefinition),name_to_call,paralocs) else retloc:=hlcg.a_call_name(current_asmdata.CurrAsmList,tprocdef(procdefinition),name_to_call,paralocs,typedef,po_weakexternal in procdefinition.procoptions); extra_post_call_code; end; end; end else { now procedure variable case } begin secondpass(right); { can we directly call the procvar in a memory location? } callref:=false; if not(po_is_block in procdefinition.procoptions) and (right.location.loc in [LOC_REFERENCE,LOC_CREFERENCE]) then begin href:=right.location.reference; callref:=can_call_ref(href); end; if not callref then load_procvar_codeptr(pvreg,callpvdef) else begin pvreg:=NR_INVALID; callpvdef:=nil; end; location_freetemp(current_asmdata.CurrAsmList,right.location); { Load parameters that are in temporary registers in the correct parameter register } if assigned(left) then begin reorder_parameters; pushparas; { free the resources allocated for the parameters } freeparas; end; if callref then extra_call_ref_code(href); cg.alloccpuregisters(current_asmdata.CurrAsmList,R_INTREGISTER,regs_to_save_int); if cg.uses_registers(R_ADDRESSREGISTER) then cg.alloccpuregisters(current_asmdata.CurrAsmList,R_ADDRESSREGISTER,regs_to_save_address); if cg.uses_registers(R_FPUREGISTER) then cg.alloccpuregisters(current_asmdata.CurrAsmList,R_FPUREGISTER,regs_to_save_fpu); if cg.uses_registers(R_MMREGISTER) then cg.alloccpuregisters(current_asmdata.CurrAsmList,R_MMREGISTER,regs_to_save_mm); { Calling interrupt from the same code requires some extra code } if (po_interrupt in procdefinition.procoptions) then extra_interrupt_code; extra_call_code; retloc.resetiftemp; if callref then retloc:=do_call_ref(href) else retloc:=hlcg.a_call_reg(current_asmdata.CurrAsmList,callpvdef,pvreg,paralocs); extra_post_call_code; end; { Need to remove the parameters from the stack? } if procdefinition.proccalloption in clearstack_pocalls then begin pop_size:=pushedparasize; { for Cdecl functions we don't need to pop the funcret when it was pushed by para. Except for safecall functions with safecall-exceptions enabled. In that case the funcret is always returned as a para which is considered a normal para on the c-side, so the funcret has to be pop'ed normally. } if not ((procdefinition.proccalloption=pocall_safecall) and (tf_safecall_exceptions in target_info.flags)) and paramanager.ret_in_param(procdefinition.returndef,procdefinition) then dec(pop_size,sizeof(pint)); { Remove parameters/alignment from the stack } pop_parasize(pop_size); end { in case we use a fixed stack, we did not push anything, if the stack is really adjusted because a ret xxx was done, depends on pop_parasize which uses pushedparasize to determine this This does not apply to interrupt procedures, their ret statment never clears any stack parameters } else if paramanager.use_fixed_stack and not(po_interrupt in procdefinition.procoptions) and (target_info.abi=abi_i386_dynalignedstack) then begin { however, a delphi style frame pointer for a nested subroutine is not cleared by the callee, so we have to compensate for this by passing 4 as pushedparasize does include it } if po_delphi_nested_cc in procdefinition.procoptions then pop_parasize(sizeof(pint)) else pop_parasize(0); end { frame pointer parameter is popped by the caller when it's passed the Delphi way } else if (po_delphi_nested_cc in procdefinition.procoptions) and not paramanager.use_fixed_stack then pop_parasize(sizeof(pint)); { Release registers, but not the registers that contain the function result } if (not is_void(resultdef)) then begin retlocitem:=retloc.location; while assigned(retlocitem) do begin case retlocitem^.loc of LOC_REGISTER: case getregtype(retlocitem^.register) of R_INTREGISTER: exclude(regs_to_save_int,getsupreg(retlocitem^.register)); R_ADDRESSREGISTER: exclude(regs_to_save_address,getsupreg(retlocitem^.register)); R_TEMPREGISTER: ; else internalerror(2014020103); end; LOC_FPUREGISTER: exclude(regs_to_save_fpu,getsupreg(retlocitem^.register)); LOC_MMREGISTER: exclude(regs_to_save_mm,getsupreg(retlocitem^.register)); LOC_REFERENCE, LOC_VOID: ; else internalerror(2004110214); end; retlocitem:=retlocitem^.next; end; end; if cg.uses_registers(R_MMREGISTER) then cg.dealloccpuregisters(current_asmdata.CurrAsmList,R_MMREGISTER,regs_to_save_mm); if cg.uses_registers(R_FPUREGISTER) then cg.dealloccpuregisters(current_asmdata.CurrAsmList,R_FPUREGISTER,regs_to_save_fpu); if cg.uses_registers(R_ADDRESSREGISTER) then cg.dealloccpuregisters(current_asmdata.CurrAsmList,R_ADDRESSREGISTER,regs_to_save_address); cg.dealloccpuregisters(current_asmdata.CurrAsmList,R_INTREGISTER,regs_to_save_int); {$ifdef SUPPORT_SAFECALL} if (procdefinition.proccalloption=pocall_safecall) and (tf_safecall_exceptions in target_info.flags) then begin pd:=search_system_proc('fpc_safecallcheck'); cgpara.init; paramanager.getintparaloc(current_asmdata.CurrAsmList,pd,1,cgpara); cg.a_load_reg_cgpara(current_asmdata.CurrAsmList,OS_INT,NR_FUNCTION_RESULT_REG,cgpara); paramanager.freecgpara(current_asmdata.CurrAsmList,cgpara); cg.g_call(current_asmdata.CurrAsmList,'FPC_SAFECALLCHECK'); cgpara.done; end; {$endif} { handle function results } if (not is_void(resultdef)) then handle_return_value else location_reset(location,LOC_VOID,OS_NO); { convert persistent temps for parameters and function result to normal temps } if assigned(callcleanupblock) then secondpass(tnode(callcleanupblock)); { copy back copy-out parameters if any } copy_back_paras; { release temps and finalize unused return values, must be after the callcleanupblock because that converts temps from persistent to normal } release_unused_return_value; { release temps of paras } release_para_temps; { perhaps i/o check ? } if (cs_check_io in current_settings.localswitches) and (po_iocheck in procdefinition.procoptions) and not(po_iocheck in current_procinfo.procdef.procoptions) and { no IO check for methods and procedure variables } (right=nil) and not(po_virtualmethod in procdefinition.procoptions) then begin hlcg.g_call_system_proc(current_asmdata.CurrAsmList,'fpc_iocheck',[],nil).resetiftemp; end; end; destructor tcgcallnode.destroy; begin retloc.resetiftemp; inherited destroy; end; begin ccallparanode:=tcgcallparanode; ccallnode:=tcgcallnode; end.