{
Copyright (c) 1998-2002 by Florian Klaempfl
Helper routines for all code generators
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 ncgutil;
{$i fpcdefs.inc}
interface
uses
node,cpuinfo,
globtype,
cpubase,cgbase,parabase,cgutils,
aasmbase,aasmtai,aasmdata,aasmcpu,
symconst,symbase,symdef,symsym,symtype,symtable
{$ifndef cpu64bit}
,cg64f32
{$endif cpu64bit}
;
type
tloadregvars = (lr_dont_load_regvars, lr_load_regvars);
pusedregvars = ^tusedregvars;
tusedregvars = record
intregvars, fpuregvars, mmregvars: Tsuperregisterworklist;
end;
{
Not used currently, implemented because I thought we had to
synchronise around if/then/else as well, but not needed. May
still be useful for SSA once we get around to implementing
that (JM)
pusedregvarscommon = ^tusedregvarscommon;
tusedregvarscommon = record
allregvars, commonregvars, myregvars: tusedregvars;
end;
}
procedure firstcomplex(p : tbinarynode);
procedure maketojumpbool(list:TAsmList; p : tnode; loadregvars: tloadregvars);
// procedure remove_non_regvars_from_loc(const t: tlocation; var regs:Tsuperregisterset);
procedure location_force_reg(list:TAsmList;var l:tlocation;dst_size:TCGSize;maybeconst:boolean);
procedure location_force_fpureg(list:TAsmList;var l: tlocation;maybeconst:boolean);
procedure location_force_mem(list:TAsmList;var l:tlocation);
procedure location_force_mmregscalar(list:TAsmList;var l: tlocation;maybeconst:boolean);
procedure location_force_mmreg(list:TAsmList;var l: tlocation;maybeconst:boolean);
{ Retrieve the location of the data pointed to in location l, when the location is
a register it is expected to contain the address of the data }
procedure location_get_data_ref(list:TAsmList;const l:tlocation;var ref:treference;loadref:boolean);
function maybe_pushfpu(list:TAsmList;needed : byte;var l:tlocation) : boolean;
function has_alias_name(pd:tprocdef;const s:string):boolean;
procedure alloc_proc_symbol(pd: tprocdef);
procedure gen_proc_symbol(list:TAsmList);
procedure gen_proc_symbol_end(list:TAsmList);
procedure gen_proc_entry_code(list:TAsmList);
procedure gen_proc_exit_code(list:TAsmList);
procedure gen_stack_check_size_para(list:TAsmList);
procedure gen_stack_check_call(list:TAsmList);
procedure gen_save_used_regs(list:TAsmList);
procedure gen_restore_used_regs(list:TAsmList);
procedure gen_initialize_code(list:TAsmList);
procedure gen_finalize_code(list:TAsmList);
procedure gen_entry_code(list:TAsmList);
procedure gen_exit_code(list:TAsmList);
procedure gen_load_para_value(list:TAsmList);
procedure gen_load_return_value(list:TAsmList);
procedure gen_external_stub(list:TAsmList;pd:tprocdef;const externalname:string);
procedure gen_intf_wrappers(list:TAsmList;st:TSymtable);
procedure gen_load_vmt_register(list:TAsmList;objdef:tobjectdef;selfloc:tlocation;var vmtreg:tregister);
procedure get_used_regvars(n: tnode; var rv: tusedregvars);
{ adds the regvars used in n and its children to rv.allregvars,
those which were already in rv.allregvars to rv.commonregvars and
uses rv.myregvars as scratch (so that two uses of the same regvar
in a single tree to make it appear in commonregvars). Useful to
find out which regvars are used in two different node trees
(e.g. in the "else" and "then" path, or in various case blocks }
// procedure get_used_regvars_common(n: tnode; var rv: tusedregvarscommon);
procedure gen_sync_regvars(list:TAsmList; var rv: tusedregvars);
{ if the result of n is a LOC_C(..)REGISTER, try to find the corresponding }
{ loadn and change its location to a new register (= SSA). In case reload }
{ is true, transfer the old to the new register }
procedure maybechangeloadnodereg(list: TAsmList; var n: tnode; reload: boolean);
{#
Allocate the buffers for exception management and setjmp environment.
Return a pointer to these buffers, send them to the utility routine
so they are registered, and then call setjmp.
Then compare the result of setjmp with 0, and if not equal
to zero, then jump to exceptlabel.
Also store the result of setjmp to a temporary space by calling g_save_exception_reason
It is to note that this routine may be called *after* the stackframe of a
routine has been called, therefore on machines where the stack cannot
be modified, all temps should be allocated on the heap instead of the
stack.
}
const
EXCEPT_BUF_SIZE = 3*sizeof(aint);
type
texceptiontemps=record
jmpbuf,
envbuf,
reasonbuf : treference;
end;
procedure get_exception_temps(list:TAsmList;var t:texceptiontemps);
procedure unget_exception_temps(list:TAsmList;const t:texceptiontemps);
procedure new_exception(list:TAsmList;const t:texceptiontemps;exceptlabel:tasmlabel);
procedure free_exception(list:TAsmList;const t:texceptiontemps;a:aint;endexceptlabel:tasmlabel;onlyfree:boolean);
procedure insertbssdata(sym : tstaticvarsym);
procedure gen_alloc_symtable(list:TAsmList;st:TSymtable);
procedure gen_free_symtable(list:TAsmList;st:TSymtable);
procedure location_free(list: TAsmList; const location : TLocation);
function getprocalign : shortint;
procedure gen_pic_helpers(list : TAsmList);
procedure gen_got_load(list : TAsmList);
implementation
uses
version,
cutils,cclasses,
globals,systems,verbose,
ppu,defutil,
procinfo,paramgr,fmodule,
regvars,dbgbase,
pass_1,pass_2,
nbas,ncon,nld,nmem,nutils,
tgobj,cgobj
{$ifdef powerpc}
, cpupi
{$endif}
{$ifdef powerpc64}
, cpupi
{$endif}
{$ifdef SUPPORT_MMX}
, cgx86
{$endif SUPPORT_MMX}
;
{*****************************************************************************
Misc Helpers
*****************************************************************************}
procedure location_free(list: TAsmList; const location : TLocation);
begin
case location.loc of
LOC_VOID:
;
LOC_REGISTER,
LOC_CREGISTER:
begin
if getsupreg(location.register)<first_int_imreg then
cg.ungetcpuregister(list,location.register);
end;
LOC_FPUREGISTER,
LOC_CFPUREGISTER:
begin
if getsupreg(location.register)<first_fpu_imreg then
cg.ungetcpuregister(list,location.register);
end;
LOC_MMREGISTER,
LOC_CMMREGISTER :
begin
if getsupreg(location.register)<first_mm_imreg then
cg.ungetcpuregister(list,location.register);
end;
LOC_REFERENCE,
LOC_CREFERENCE :
begin
if use_fixed_stack then
location_freetemp(list,location);
end;
else
internalerror(2004110211);
end;
end;
{ DO NOT RELY on the fact that the tnode is not yet swaped
because of inlining code PM }
procedure firstcomplex(p : tbinarynode);
var
hp : tnode;
begin
{ always calculate boolean AND and OR from left to right }
if (p.nodetype in [orn,andn]) and
is_boolean(p.left.resultdef) then
begin
if nf_swapped in p.flags then
internalerror(234234);
end
else
if (
(p.expectloc=LOC_FPUREGISTER) and
(p.right.registersfpu > p.left.registersfpu)
) or
(
(
(
((p.left.registersfpu = 0) and (p.right.registersfpu = 0)) or
(p.expectloc<>LOC_FPUREGISTER)
) and
(p.left.registersint<p.right.registersint)
)
) then
begin
hp:=p.left;
p.left:=p.right;
p.right:=hp;
if nf_swapped in p.flags then
exclude(p.flags,nf_swapped)
else
include(p.flags,nf_swapped);
end;
end;
procedure maketojumpbool(list:TAsmList; p : tnode; loadregvars: tloadregvars);
{
produces jumps to true respectively false labels using boolean expressions
depending on whether the loading of regvars is currently being
synchronized manually (such as in an if-node) or automatically (most of
the other cases where this procedure is called), loadregvars can be
"lr_load_regvars" or "lr_dont_load_regvars"
}
var
opsize : tcgsize;
storepos : tfileposinfo;
tmpreg : tregister;
begin
if nf_error in p.flags then
exit;
storepos:=current_filepos;
current_filepos:=p.fileinfo;
if is_boolean(p.resultdef) then
begin
{$ifdef OLDREGVARS}
if loadregvars = lr_load_regvars then
load_all_regvars(list);
{$endif OLDREGVARS}
if is_constboolnode(p) then
begin
if tordconstnode(p).value<>0 then
cg.a_jmp_always(list,current_procinfo.CurrTrueLabel)
else
cg.a_jmp_always(list,current_procinfo.CurrFalseLabel)
end
else
begin
opsize:=def_cgsize(p.resultdef);
case p.location.loc of
LOC_SUBSETREG,LOC_CSUBSETREG,
LOC_SUBSETREF,LOC_CSUBSETREF:
begin
tmpreg := cg.getintregister(list,OS_INT);
cg.a_load_loc_reg(list,OS_INT,p.location,tmpreg);
cg.a_cmp_const_reg_label(list,OS_INT,OC_NE,0,tmpreg,current_procinfo.CurrTrueLabel);
cg.a_jmp_always(list,current_procinfo.CurrFalseLabel);
end;
LOC_CREGISTER,LOC_REGISTER,LOC_CREFERENCE,LOC_REFERENCE :
begin
cg.a_cmp_const_loc_label(list,opsize,OC_NE,0,p.location,current_procinfo.CurrTrueLabel);
cg.a_jmp_always(list,current_procinfo.CurrFalseLabel);
end;
LOC_JUMP:
;
{$ifdef cpuflags}
LOC_FLAGS :
begin
cg.a_jmp_flags(list,p.location.resflags,current_procinfo.CurrTrueLabel);
cg.a_jmp_always(list,current_procinfo.CurrFalseLabel);
end;
{$endif cpuflags}
else
begin
printnode(output,p);
internalerror(200308241);
end;
end;
end;
end
else
internalerror(200112305);
current_filepos:=storepos;
end;
(*
This code needs fixing. It is not safe to use rgint; on the m68000 it
would be rgaddr.
procedure remove_non_regvars_from_loc(const t: tlocation; var regs:Tsuperregisterset);
begin
case t.loc of
LOC_REGISTER:
begin
{ can't be a regvar, since it would be LOC_CREGISTER then }
exclude(regs,getsupreg(t.register));
if t.register64.reghi<>NR_NO then
exclude(regs,getsupreg(t.register64.reghi));
end;
LOC_CREFERENCE,LOC_REFERENCE:
begin
if not(cs_opt_regvar in current_settings.optimizerswitches) or
(getsupreg(t.reference.base) in cg.rgint.usableregs) then
exclude(regs,getsupreg(t.reference.base));
if not(cs_opt_regvar in current_settings.optimizerswitches) or
(getsupreg(t.reference.index) in cg.rgint.usableregs) then
exclude(regs,getsupreg(t.reference.index));
end;
end;
end;
*)
{*****************************************************************************
EXCEPTION MANAGEMENT
*****************************************************************************}
procedure get_exception_temps(list:TAsmList;var t:texceptiontemps);
var
srsym : ttypesym;
begin
if jmp_buf_size=-1 then
begin
srsym:=search_system_type('JMP_BUF');
jmp_buf_size:=srsym.typedef.size;
end;
tg.GetTemp(list,EXCEPT_BUF_SIZE,tt_persistent,t.envbuf);
tg.GetTemp(list,jmp_buf_size,tt_persistent,t.jmpbuf);
tg.GetTemp(list,sizeof(aint),tt_persistent,t.reasonbuf);
end;
procedure unget_exception_temps(list:TAsmList;const t:texceptiontemps);
begin
tg.Ungettemp(list,t.jmpbuf);
tg.ungettemp(list,t.envbuf);
tg.ungettemp(list,t.reasonbuf);
end;
procedure new_exception(list:TAsmList;const t:texceptiontemps;exceptlabel:tasmlabel);
var
paraloc1,paraloc2,paraloc3 : tcgpara;
begin
paraloc1.init;
paraloc2.init;
paraloc3.init;
paramanager.getintparaloc(pocall_default,1,paraloc1);
paramanager.getintparaloc(pocall_default,2,paraloc2);
paramanager.getintparaloc(pocall_default,3,paraloc3);
paramanager.allocparaloc(list,paraloc3);
cg.a_paramaddr_ref(list,t.envbuf,paraloc3);
paramanager.allocparaloc(list,paraloc2);
cg.a_paramaddr_ref(list,t.jmpbuf,paraloc2);
{ push type of exceptionframe }
paramanager.allocparaloc(list,paraloc1);
cg.a_param_const(list,OS_S32,1,paraloc1);
paramanager.freeparaloc(list,paraloc3);
paramanager.freeparaloc(list,paraloc2);
paramanager.freeparaloc(list,paraloc1);
cg.allocallcpuregisters(list);
cg.a_call_name(list,'FPC_PUSHEXCEPTADDR');
cg.deallocallcpuregisters(list);
paramanager.getintparaloc(pocall_default,1,paraloc1);
paramanager.allocparaloc(list,paraloc1);
cg.a_param_reg(list,OS_ADDR,NR_FUNCTION_RESULT_REG,paraloc1);
paramanager.freeparaloc(list,paraloc1);
cg.allocallcpuregisters(list);
cg.a_call_name(list,'FPC_SETJMP');
cg.deallocallcpuregisters(list);
cg.alloccpuregisters(list,R_INTREGISTER,[RS_FUNCTION_RESULT_REG]);
cg.g_exception_reason_save(list, t.reasonbuf);
cg.a_cmp_const_reg_label(list,OS_S32,OC_NE,0,cg.makeregsize(list,NR_FUNCTION_RESULT_REG,OS_S32),exceptlabel);
cg.dealloccpuregisters(list,R_INTREGISTER,[RS_FUNCTION_RESULT_REG]);
paraloc1.done;
paraloc2.done;
paraloc3.done;
end;
procedure free_exception(list:TAsmList;const t:texceptiontemps;a:aint;endexceptlabel:tasmlabel;onlyfree:boolean);
begin
cg.allocallcpuregisters(list);
cg.a_call_name(list,'FPC_POPADDRSTACK');
cg.deallocallcpuregisters(list);
if not onlyfree then
begin
cg.alloccpuregisters(list,R_INTREGISTER,[RS_FUNCTION_RESULT_REG]);
cg.g_exception_reason_load(list, t.reasonbuf);
cg.a_cmp_const_reg_label(list,OS_INT,OC_EQ,a,NR_FUNCTION_RESULT_REG,endexceptlabel);
cg.dealloccpuregisters(list,R_INTREGISTER,[RS_FUNCTION_RESULT_REG]);
end;
end;
{*****************************************************************************
TLocation
*****************************************************************************}
{$ifndef cpu64bit}
{ 32-bit version }
procedure location_force_reg(list:TAsmList;var l:tlocation;dst_size:TCGSize;maybeconst:boolean);
var
hregister,
hregisterhi : tregister;
hreg64 : tregister64;
hl : tasmlabel;
oldloc : tlocation;
const_location: boolean;
begin
oldloc:=l;
if dst_size=OS_NO then
internalerror(200309144);
{ handle transformations to 64bit separate }
if dst_size in [OS_64,OS_S64] then
begin
if not (l.size in [OS_64,OS_S64]) then
begin
{ load a smaller size to OS_64 }
if l.loc=LOC_REGISTER then
begin
hregister:=cg.makeregsize(list,l.register64.reglo,OS_32);
cg.a_load_reg_reg(list,l.size,OS_32,l.register64.reglo,hregister);
end
else
hregister:=cg.getintregister(list,OS_INT);
{ load value in low register }
case l.loc of
LOC_FLAGS :
cg.g_flags2reg(list,OS_INT,l.resflags,hregister);
LOC_JUMP :
begin
cg.a_label(list,current_procinfo.CurrTrueLabel);
cg.a_load_const_reg(list,OS_INT,1,hregister);
current_asmdata.getjumplabel(hl);
cg.a_jmp_always(list,hl);
cg.a_label(list,current_procinfo.CurrFalseLabel);
cg.a_load_const_reg(list,OS_INT,0,hregister);
cg.a_label(list,hl);
end;
else
cg.a_load_loc_reg(list,OS_INT,l,hregister);
end;
{ reset hi part, take care of the signed bit of the current value }
hregisterhi:=cg.getintregister(list,OS_INT);
if (l.size in [OS_S8,OS_S16,OS_S32]) then
begin
if l.loc=LOC_CONSTANT then
begin
if (longint(l.value)<0) then
cg.a_load_const_reg(list,OS_32,aint($ffffffff),hregisterhi)
else
cg.a_load_const_reg(list,OS_32,0,hregisterhi);
end
else
begin
cg.a_op_const_reg_reg(list,OP_SAR,OS_32,31,hregister,
hregisterhi);
end;
end
else
cg.a_load_const_reg(list,OS_32,0,hregisterhi);
location_reset(l,LOC_REGISTER,dst_size);
l.register64.reglo:=hregister;
l.register64.reghi:=hregisterhi;
end
else
begin
{ 64bit to 64bit }
if ((l.loc=LOC_CREGISTER) and maybeconst) then
begin
hregister:=l.register64.reglo;
hregisterhi:=l.register64.reghi;
const_location := true;
end
else
begin
hregister:=cg.getintregister(list,OS_INT);
hregisterhi:=cg.getintregister(list,OS_INT);
const_location := false;
end;
hreg64.reglo:=hregister;
hreg64.reghi:=hregisterhi;
{ load value in new register }
cg64.a_load64_loc_reg(list,l,hreg64);
if not const_location then
location_reset(l,LOC_REGISTER,dst_size)
else
location_reset(l,LOC_CREGISTER,dst_size);
l.register64.reglo:=hregister;
l.register64.reghi:=hregisterhi;
end;
end
else
begin
{Do not bother to recycle the existing register. The register
allocator eliminates unnecessary moves, so it's not needed
and trying to recycle registers can cause problems because
the registers changes size and may need aditional constraints.
Not if it's about LOC_CREGISTER's (JM)
}
const_location :=
(maybeconst) and
(l.loc = LOC_CREGISTER) and
(TCGSize2Size[l.size] = TCGSize2Size[dst_size]) and
((l.size = dst_size) or
(TCGSize2Size[l.size] = TCGSize2Size[OS_INT]));
if not const_location then
hregister:=cg.getintregister(list,dst_size)
else
hregister := l.register;
{ load value in new register }
case l.loc of
LOC_FLAGS :
cg.g_flags2reg(list,dst_size,l.resflags,hregister);
LOC_JUMP :
begin
cg.a_label(list,current_procinfo.CurrTrueLabel);
cg.a_load_const_reg(list,dst_size,1,hregister);
current_asmdata.getjumplabel(hl);
cg.a_jmp_always(list,hl);
cg.a_label(list,current_procinfo.CurrFalseLabel);
cg.a_load_const_reg(list,dst_size,0,hregister);
cg.a_label(list,hl);
end;
else
begin
{ load_loc_reg can only handle size >= l.size, when the
new size is smaller then we need to adjust the size
of the orignal and maybe recalculate l.register for i386 }
if (TCGSize2Size[dst_size]<TCGSize2Size[l.size]) then
begin
if (l.loc in [LOC_REGISTER,LOC_CREGISTER]) then
l.register:=cg.makeregsize(list,l.register,dst_size);
{ for big endian systems, the reference's offset must }
{ be increased in this case, since they have the }
{ MSB first in memory and e.g. byte(word_var) should }
{ return the second byte in this case (JM) }
if (target_info.endian = ENDIAN_BIG) and
(l.loc in [LOC_REFERENCE,LOC_CREFERENCE,LOC_SUBSETREF,LOC_CSUBSETREF]) then
inc(l.reference.offset,TCGSize2Size[l.size]-TCGSize2Size[dst_size]);
{$ifdef x86}
if not (l.loc in [LOC_SUBSETREG,LOC_CSUBSETREG]) then
l.size:=dst_size;
{$endif x86}
end;
cg.a_load_loc_reg(list,dst_size,l,hregister);
if (TCGSize2Size[dst_size]<TCGSize2Size[l.size])
{$ifdef x86}
and (l.loc in [LOC_SUBSETREG,LOC_CSUBSETREG])
{$endif x86}
then
l.size:=dst_size;
end;
end;
if not const_location then
location_reset(l,LOC_REGISTER,dst_size)
else
location_reset(l,LOC_CREGISTER,dst_size);
l.register:=hregister;
end;
{ Release temp when it was a reference }
if oldloc.loc=LOC_REFERENCE then
location_freetemp(list,oldloc);
end;
{$else cpu64bit}
{ 64-bit version }
procedure location_force_reg(list:TAsmList;var l:tlocation;dst_size:TCGSize;maybeconst:boolean);
var
hregister : tregister;
hl : tasmlabel;
oldloc : tlocation;
begin
oldloc:=l;
hregister:=cg.getintregister(list,dst_size);
{ load value in new register }
case l.loc of
LOC_FLAGS :
cg.g_flags2reg(list,dst_size,l.resflags,hregister);
LOC_JUMP :
begin
cg.a_label(list,current_procinfo.CurrTrueLabel);
cg.a_load_const_reg(list,dst_size,1,hregister);
current_asmdata.getjumplabel(hl);
cg.a_jmp_always(list,hl);
cg.a_label(list,current_procinfo.CurrFalseLabel);
cg.a_load_const_reg(list,dst_size,0,hregister);
cg.a_label(list,hl);
end;
else
begin
{ load_loc_reg can only handle size >= l.size, when the
new size is smaller then we need to adjust the size
of the orignal and maybe recalculate l.register for i386 }
if (TCGSize2Size[dst_size]<TCGSize2Size[l.size]) then
begin
if (l.loc in [LOC_REGISTER,LOC_CREGISTER]) then
l.register:=cg.makeregsize(list,l.register,dst_size);
{ for big endian systems, the reference's offset must }
{ be increased in this case, since they have the }
{ MSB first in memory and e.g. byte(word_var) should }
{ return the second byte in this case (JM) }
if (target_info.endian = ENDIAN_BIG) and
(l.loc in [LOC_REFERENCE,LOC_CREFERENCE]) then
inc(l.reference.offset,TCGSize2Size[l.size]-TCGSize2Size[dst_size]);
{$ifdef x86}
l.size:=dst_size;
{$endif x86}
end;
cg.a_load_loc_reg(list,dst_size,l,hregister);
{$ifndef x86}
if (TCGSize2Size[dst_size]<TCGSize2Size[l.size]) then
l.size:=dst_size;
{$endif not x86}
end;
end;
if (l.loc <> LOC_CREGISTER) or
not maybeconst then
location_reset(l,LOC_REGISTER,dst_size)
else
location_reset(l,LOC_CREGISTER,dst_size);
l.register:=hregister;
{ Release temp when it was a reference }
if oldloc.loc=LOC_REFERENCE then
location_freetemp(list,oldloc);
end;
{$endif cpu64bit}
procedure location_force_fpureg(list:TAsmList;var l: tlocation;maybeconst:boolean);
var
reg : tregister;
href : treference;
begin
if (l.loc<>LOC_FPUREGISTER) and
((l.loc<>LOC_CFPUREGISTER) or (not maybeconst)) then
begin
{ if it's in an mm register, store to memory first }
if (l.loc in [LOC_MMREGISTER,LOC_CMMREGISTER]) then
begin
tg.GetTemp(list,tcgsize2size[l.size],tt_normal,href);
cg.a_loadmm_reg_ref(list,l.size,l.size,l.register,href,mms_movescalar);
location_reset(l,LOC_REFERENCE,l.size);
l.reference:=href;
end;
reg:=cg.getfpuregister(list,l.size);
cg.a_loadfpu_loc_reg(list,l.size,l,reg);
location_freetemp(list,l);
location_reset(l,LOC_FPUREGISTER,l.size);
l.register:=reg;
end;
end;
procedure location_force_mmregscalar(list:TAsmList;var l: tlocation;maybeconst:boolean);
var
reg : tregister;
href : treference;
begin
if (l.loc<>LOC_MMREGISTER) and
((l.loc<>LOC_CMMREGISTER) or (not maybeconst)) then
begin
{ if it's in an fpu register, store to memory first }
if (l.loc in [LOC_FPUREGISTER,LOC_CFPUREGISTER]) then
begin
tg.GetTemp(list,tcgsize2size[l.size],tt_normal,href);
cg.a_loadfpu_reg_ref(list,l.size,l.size,l.register,href);
location_reset(l,LOC_REFERENCE,l.size);
l.reference:=href;
end;
reg:=cg.getmmregister(list,l.size);
cg.a_loadmm_loc_reg(list,l.size,l,reg,mms_movescalar);
location_freetemp(list,l);
location_reset(l,LOC_MMREGISTER,l.size);
l.register:=reg;
end;
end;
procedure location_force_mmreg(list:TAsmList;var l: tlocation;maybeconst:boolean);
var
reg : tregister;
begin
if (l.loc<>LOC_MMREGISTER) and
((l.loc<>LOC_CMMREGISTER) or (not maybeconst)) then
begin
reg:=cg.getmmregister(list,OS_VECTOR);
cg.a_loadmm_loc_reg(list,OS_VECTOR,l,reg,nil);
location_freetemp(list,l);
location_reset(l,LOC_MMREGISTER,OS_VECTOR);
l.register:=reg;
end;
end;
procedure location_force_mem(list:TAsmList;var l:tlocation);
var
r : treference;
begin
case l.loc of
LOC_FPUREGISTER,
LOC_CFPUREGISTER :
begin
tg.GetTemp(list,TCGSize2Size[l.size],tt_normal,r);
cg.a_loadfpu_reg_ref(list,l.size,l.size,l.register,r);
location_reset(l,LOC_REFERENCE,l.size);
l.reference:=r;
end;
LOC_MMREGISTER,
LOC_CMMREGISTER:
begin
tg.GetTemp(list,TCGSize2Size[l.size],tt_normal,r);
cg.a_loadmm_reg_ref(list,l.size,l.size,l.register,r,mms_movescalar);
location_reset(l,LOC_REFERENCE,l.size);
l.reference:=r;
end;
LOC_CONSTANT,
LOC_REGISTER,
LOC_CREGISTER :
begin
tg.GetTemp(list,TCGSize2Size[l.size],tt_normal,r);
{$ifndef cpu64bit}
if l.size in [OS_64,OS_S64] then
cg64.a_load64_loc_ref(list,l,r)
else
{$endif cpu64bit}
cg.a_load_loc_ref(list,l.size,l,r);
location_reset(l,LOC_REFERENCE,l.size);
l.reference:=r;
end;
LOC_SUBSETREG,
LOC_CSUBSETREG,
LOC_SUBSETREF,
LOC_CSUBSETREF:
begin
tg.GetTemp(list,TCGSize2Size[l.size],tt_normal,r);
cg.a_load_loc_ref(list,l.size,l,r);
location_reset(l,LOC_REFERENCE,l.size);
l.reference:=r;
end;
LOC_CREFERENCE,
LOC_REFERENCE : ;
else
internalerror(200203219);
end;
end;
procedure location_get_data_ref(list:TAsmList;const l:tlocation;var ref:treference;loadref:boolean);
begin
case l.loc of
LOC_REGISTER,
LOC_CREGISTER :
begin
if not loadref then
internalerror(200410231);
reference_reset_base(ref,l.register,0);
end;
LOC_REFERENCE,
LOC_CREFERENCE :
begin
if loadref then
begin
reference_reset_base(ref,cg.getaddressregister(list),0);
cg.a_load_ref_reg(list,OS_ADDR,OS_ADDR,l.reference,ref.base);
end
else
ref:=l.reference;
end;
else
internalerror(200309181);
end;
end;
{*****************************************************************************
Maybe_Save
*****************************************************************************}
function maybe_pushfpu(list:TAsmList;needed : byte;var l:tlocation) : boolean;
begin
{$ifdef i386}
if (needed>=maxfpuregs) and
(l.loc = LOC_FPUREGISTER) then
begin
location_force_mem(list,l);
maybe_pushfpu:=true;
end
else
maybe_pushfpu:=false;
{$else i386}
maybe_pushfpu:=false;
{$endif i386}
end;
{****************************************************************************
Init/Finalize Code
****************************************************************************}
procedure copyvalueparas(p:TObject;arg:pointer);
var
href : treference;
hreg : tregister;
list : TAsmList;
hsym : tparavarsym;
l : longint;
localcopyloc : tlocation;
begin
list:=TAsmList(arg);
if (tsym(p).typ=paravarsym) and
(tparavarsym(p).varspez=vs_value) and
(paramanager.push_addr_param(tparavarsym(p).varspez,tparavarsym(p).vardef,current_procinfo.procdef.proccalloption)) then
begin
location_get_data_ref(list,tparavarsym(p).initialloc,href,true);
if is_open_array(tparavarsym(p).vardef) or
is_array_of_const(tparavarsym(p).vardef) then
begin
{ cdecl functions don't have a high pointer so it is not possible to generate
a local copy }
if not(current_procinfo.procdef.proccalloption in [pocall_cdecl,pocall_cppdecl]) then
begin
hsym:=tparavarsym(tsym(p).owner.Find('high'+tsym(p).name));
if not assigned(hsym) then
internalerror(200306061);
hreg:=cg.getaddressregister(list);
if not is_packed_array(tparavarsym(p).vardef) then
cg.g_copyvaluepara_openarray(list,href,hsym.initialloc,tarraydef(tparavarsym(p).vardef).elesize,hreg)
else
internalerror(2006080401);
// cg.g_copyvaluepara_packedopenarray(list,href,hsym.intialloc,tarraydef(tparavarsym(p).vardef).elepackedbitsize,hreg);
cg.a_load_reg_loc(list,OS_ADDR,hreg,tparavarsym(p).initialloc);
end;
end
else
begin
{ Allocate space for the local copy }
l:=tparavarsym(p).getsize;
localcopyloc.loc:=LOC_REFERENCE;
localcopyloc.size:=int_cgsize(l);
tg.GetLocal(list,l,tparavarsym(p).vardef,localcopyloc.reference);
{ Copy data }
if is_shortstring(tparavarsym(p).vardef) then
begin
{ this code is only executed before the code for the body and the entry/exit code is generated
so we're allowed to include pi_do_call here; after pass1 is run, this isn't allowed anymore
}
include(current_procinfo.flags,pi_do_call);
cg.g_copyshortstring(list,href,localcopyloc.reference,tstringdef(tparavarsym(p).vardef).len)
end
else if tparavarsym(p).vardef.typ = variantdef then
begin
{ this code is only executed before the code for the body and the entry/exit code is generated
so we're allowed to include pi_do_call here; after pass1 is run, this isn't allowed anymore
}
include(current_procinfo.flags,pi_do_call);
cg.g_copyvariant(list,href,localcopyloc.reference)
end
else
begin
{ pass proper alignment info }
localcopyloc.reference.alignment:=tparavarsym(p).vardef.alignment;
cg.g_concatcopy(list,href,localcopyloc.reference,tparavarsym(p).vardef.size);
end;
{ update localloc of varsym }
tg.Ungetlocal(list,tparavarsym(p).localloc.reference);
tparavarsym(p).localloc:=localcopyloc;
tparavarsym(p).initialloc:=localcopyloc;
end;
end;
end;
const
{$ifdef cpu64bit}
trashintvalues: array[0..nroftrashvalues-1] of aint = ($5555555555555555,aint($AAAAAAAAAAAAAAAA),aint($EFEFEFEFEFEFEFEF),0);
{$else cpu64bit}
trashintvalues: array[0..nroftrashvalues-1] of aint = ($55555555,aint($AAAAAAAA),aint($EFEFEFEF),0);
{$endif cpu64bit}
procedure trash_reference(list: TAsmList; const ref: treference; size: aint);
var
countreg, valuereg: tregister;
hl: tasmlabel;
trashintval: aint;
tmpref: treference;
begin
trashintval := trashintvalues[localvartrashing];
case size of
0: ; { empty record }
1: cg.a_load_const_ref(list,OS_8,byte(trashintval),ref);
2: cg.a_load_const_ref(list,OS_16,word(trashintval),ref);
4: cg.a_load_const_ref(list,OS_32,longint(trashintval),ref);
{$ifdef cpu64bit}
8: cg.a_load_const_ref(list,OS_64,int64(trashintval),ref);
{$endif cpu64bit}
else
begin
countreg := cg.getintregister(list,OS_ADDR);
valuereg := cg.getintregister(list,OS_8);
cg.a_load_const_reg(list,OS_INT,size,countreg);
cg.a_load_const_reg(list,OS_8,byte(trashintval),valuereg);
current_asmdata.getjumplabel(hl);
tmpref := ref;
if (tmpref.index <> NR_NO) then
internalerror(200607201);
tmpref.index := countreg;
dec(tmpref.offset);
cg.a_label(list,hl);
cg.a_load_reg_ref(list,OS_8,OS_8,valuereg,tmpref);
cg.a_op_const_reg(list,OP_SUB,OS_INT,1,countreg);
cg.a_cmp_const_reg_label(list,OS_INT,OC_NE,0,countreg,hl);
cg.a_reg_sync(list,tmpref.base);
cg.a_reg_sync(list,valuereg);
end;
end;
end;
{ trash contents of local variables or parameters (function result) }
procedure trash_variable(p:TObject;arg:pointer);
var
trashintval: aint;
list: TAsmList absolute arg;
begin
if ((tsym(p).typ=localvarsym) or
((tsym(p).typ=paravarsym) and
(vo_is_funcret in tparavarsym(p).varoptions))) and
not(tabstractnormalvarsym(p).vardef.needs_inittable) and
not(assigned(tabstractnormalvarsym(p).defaultconstsym)) then
begin
trashintval := trashintvalues[localvartrashing];
case tabstractnormalvarsym(p).initialloc.loc of
LOC_CREGISTER :
{$ifopt q+}
{$define overflowon}
{$q-}
{$endif}
cg.a_load_const_reg(list,reg_cgsize(tabstractnormalvarsym(p).initialloc.register),
trashintval and (aword(1) shl (tcgsize2size[reg_cgsize(tabstractnormalvarsym(p).initialloc.register)] * 8) - 1),
tabstractnormalvarsym(p).initialloc.register);
{$ifdef overflowon}
{$undef overflowon}
{$q+}
{$endif}
LOC_REFERENCE :
begin
if ((tsym(p).typ=localvarsym) and
not(vo_is_funcret in tabstractvarsym(p).varoptions)) or
not is_shortstring(tabstractnormalvarsym(p).vardef) then
trash_reference(list,tabstractnormalvarsym(p).initialloc.reference,
tlocalvarsym(p).getsize)
else
{ may be an open string, even if is_open_string() returns }
{ false for some helpers in the system unit }
{ an open string has at least size 2 }
trash_reference(list,tabstractnormalvarsym(p).initialloc.reference,
2);
end;
LOC_CMMREGISTER :
;
LOC_CFPUREGISTER :
;
else
internalerror(200410124);
end;
end;
end;
{ initializes the regvars from staticsymtable with 0 }
procedure initialize_regvars(p:TObject;arg:pointer);
var
href : treference;
begin
if (tsym(p).typ=staticvarsym) then
begin
{ Static variables can have the initialloc only set to LOC_CxREGISTER
or LOC_INVALID, for explaination see gen_alloc_symtable (PFV) }
case tstaticvarsym(p).initialloc.loc of
LOC_CREGISTER :
begin
{$ifndef cpu64bit}
if (tstaticvarsym(p).initialloc.size in [OS_64,OS_S64]) then
cg64.a_load64_const_reg(TAsmList(arg),0,tstaticvarsym(p).initialloc.register64)
else
{$endif not cpu64bit}
cg.a_load_const_reg(TAsmList(arg),reg_cgsize(tstaticvarsym(p).initialloc.register),0,
tstaticvarsym(p).initialloc.register);
end;
LOC_CMMREGISTER :
{ clear the whole register }
cg.a_opmm_reg_reg(TAsmList(arg),OP_XOR,reg_cgsize(tstaticvarsym(p).initialloc.register),
tstaticvarsym(p).initialloc.register,
tstaticvarsym(p).initialloc.register,
nil);
LOC_CFPUREGISTER :
begin
{ initialize fpu regvar by loading from memory }
reference_reset_symbol(href,
current_asmdata.RefAsmSymbol(tstaticvarsym(p).mangledname), 0);
cg.a_loadfpu_ref_reg(TAsmList(arg), tstaticvarsym(p).initialloc.size,
tstaticvarsym(p).initialloc.size, href, tstaticvarsym(p).initialloc.register);
end;
LOC_INVALID :
;
else
internalerror(200410124);
end;
end;
end;
{ generates the code for initialisation of local data }
procedure initialize_data(p:TObject;arg:pointer);
var
OldAsmList : TAsmList;
hp : tnode;
begin
if (tsym(p).typ in [staticvarsym,localvarsym]) and
(tabstractvarsym(p).refs>0) and
not(vo_is_typed_const in tabstractvarsym(p).varoptions) and
not(vo_is_external in tabstractvarsym(p).varoptions) and
not(is_class(tabstractvarsym(p).vardef)) and
tabstractvarsym(p).vardef.needs_inittable then
begin
OldAsmList:=current_asmdata.CurrAsmList;
current_asmdata.CurrAsmList:=TAsmList(arg);
hp:=initialize_data_node(cloadnode.create(tsym(p),tsym(p).owner));
firstpass(hp);
secondpass(hp);
hp.free;
current_asmdata.CurrAsmList:=OldAsmList;
end;
end;
procedure finalize_sym(asmlist:TAsmList;sym:tsym);
var
hp : tnode;
OldAsmList : TAsmList;
begin
include(current_procinfo.flags,pi_needs_implicit_finally);
OldAsmList:=current_asmdata.CurrAsmList;
current_asmdata.CurrAsmList:=asmlist;
hp:=finalize_data_node(cloadnode.create(sym,sym.owner));
firstpass(hp);
secondpass(hp);
hp.free;
current_asmdata.CurrAsmList:=OldAsmList;
end;
{ generates the code for finalisation of local variables }
procedure finalize_local_vars(p:TObject;arg:pointer);
begin
if (tsym(p).typ=localvarsym) and
(tlocalvarsym(p).refs>0) and
not(vo_is_external in tlocalvarsym(p).varoptions) and
not(vo_is_funcret in tlocalvarsym(p).varoptions) and
not(is_class(tlocalvarsym(p).vardef)) and
tlocalvarsym(p).vardef.needs_inittable then
finalize_sym(TAsmList(arg),tsym(p));
end;
{ generates the code for finalization of static symtable and
all local (static) typed consts }
procedure finalize_static_data(p:TObject;arg:pointer);
var
i : longint;
pd : tprocdef;
begin
case tsym(p).typ of
staticvarsym :
begin
if (tstaticvarsym(p).refs>0) and
(tstaticvarsym(p).varspez<>vs_const) and
not(vo_is_funcret in tstaticvarsym(p).varoptions) and
not(vo_is_external in tstaticvarsym(p).varoptions) and
not(is_class(tstaticvarsym(p).vardef)) and
tstaticvarsym(p).vardef.needs_inittable then
finalize_sym(TAsmList(arg),tsym(p));
end;
procsym :
begin
for i:=0 to tprocsym(p).ProcdefList.Count-1 do
begin
pd:=tprocdef(tprocsym(p).ProcdefList[i]);
if assigned(pd.localst) and
(pd.procsym=tprocsym(p)) and
(pd.localst.symtabletype<>staticsymtable) then
pd.localst.SymList.ForEachCall(@finalize_static_data,arg);
end;
end;
end;
end;
{ generates the code for incrementing the reference count of parameters and
initialize out parameters }
procedure init_paras(p:TObject;arg:pointer);
var
href : treference;
tmpreg : tregister;
list : TAsmList;
needs_inittable,
do_trashing : boolean;
begin
list:=TAsmList(arg);
if (tsym(p).typ=paravarsym) then
begin
needs_inittable :=
not is_class_or_interface(tparavarsym(p).vardef) and
tparavarsym(p).vardef.needs_inittable;
do_trashing :=
(localvartrashing <> -1) and
(not assigned(tparavarsym(p).defaultconstsym)) and
(not tparavarsym(p).vardef.needs_inittable or
is_class(tparavarsym(p).vardef));
case tparavarsym(p).varspez of
vs_value :
if needs_inittable then
begin
{ variants are already handled by the call to fpc_variant_copy_overwrite }
if tparavarsym(p).vardef.typ <> variantdef then begin
location_get_data_ref(list,tparavarsym(p).initialloc,href,is_open_array(tparavarsym(p).vardef));
cg.g_incrrefcount(list,tparavarsym(p).vardef,href);
end;
end;
vs_out :
begin
if needs_inittable or
do_trashing then
begin
tmpreg:=cg.getaddressregister(list);
cg.a_load_loc_reg(list,OS_ADDR,tparavarsym(p).initialloc,tmpreg);
reference_reset_base(href,tmpreg,0);
if do_trashing and
{ needs separate implementation to trash open arrays }
{ since their size is only known at run time }
not is_special_array(tparavarsym(p).vardef) then
trash_reference(list,href,tparavarsym(p).vardef.size);
if needs_inittable then
cg.g_initialize(list,tparavarsym(p).vardef,href);
end;
end;
else if do_trashing and
([vo_is_funcret,vo_is_hidden_para] * tparavarsym(p).varoptions = [vo_is_funcret,vo_is_hidden_para]) then
begin
tmpreg:=cg.getaddressregister(list);
cg.a_load_loc_reg(list,OS_ADDR,tparavarsym(p).initialloc,tmpreg);
reference_reset_base(href,tmpreg,0);
{ may be an open string, even if is_open_string() returns }
{ false for some helpers in the system unit }
if not is_shortstring(tparavarsym(p).vardef) then
trash_reference(list,href,tparavarsym(p).vardef.size)
else
{ an open string has at least size 2 }
trash_reference(list,href,2);
end
end;
end;
end;
{ generates the code for decrementing the reference count of parameters }
procedure final_paras(p:TObject;arg:pointer);
var
list : TAsmList;
href : treference;
begin
if not(tsym(p).typ=paravarsym) then
exit;
list:=TAsmList(arg);
if not is_class_or_interface(tparavarsym(p).vardef) and
tparavarsym(p).vardef.needs_inittable then
begin
if (tparavarsym(p).varspez=vs_value) then
begin
include(current_procinfo.flags,pi_needs_implicit_finally);
location_get_data_ref(list,tparavarsym(p).localloc,href,is_open_array(tparavarsym(p).vardef));
cg.g_decrrefcount(list,tparavarsym(p).vardef,href);
end;
end;
{ open arrays can contain elements requiring init/final code, so the else has been removed here }
if (tparavarsym(p).varspez=vs_value) and
(is_open_array(tparavarsym(p).vardef) or
is_array_of_const(tparavarsym(p).vardef)) then
begin
{ cdecl functions don't have a high pointer so it is not possible to generate
a local copy }
if not(current_procinfo.procdef.proccalloption in [pocall_cdecl,pocall_cppdecl]) then
cg.g_releasevaluepara_openarray(list,tparavarsym(p).localloc);
end;
end;
{ Initialize temp ansi/widestrings,interfaces }
procedure inittempvariables(list:TAsmList);
var
hp : ptemprecord;
href : treference;
begin
hp:=tg.templist;
while assigned(hp) do
begin
if assigned(hp^.def) and
hp^.def.needs_inittable then
begin
reference_reset_base(href,current_procinfo.framepointer,hp^.pos);
cg.g_initialize(list,hp^.def,href);
end;
hp:=hp^.next;
end;
end;
procedure finalizetempvariables(list:TAsmList);
var
hp : ptemprecord;
href : treference;
begin
hp:=tg.templist;
while assigned(hp) do
begin
if assigned(hp^.def) and
hp^.def.needs_inittable then
begin
include(current_procinfo.flags,pi_needs_implicit_finally);
reference_reset_base(href,current_procinfo.framepointer,hp^.pos);
cg.g_finalize(list,hp^.def,href);
end;
hp:=hp^.next;
end;
end;
procedure gen_load_return_value(list:TAsmList);
var
{$ifndef cpu64bit}
href : treference;
{$endif cpu64bit}
ressym : tabstractnormalvarsym;
resloc,
restmploc : tlocation;
hreg : tregister;
funcretloc : tlocation;
begin
{ Is the loading needed? }
if (current_procinfo.procdef.funcretloc[calleeside].loc=LOC_VOID) or
(
(po_assembler in current_procinfo.procdef.procoptions) and
(not(assigned(current_procinfo.procdef.funcretsym)) or
(tabstractvarsym(current_procinfo.procdef.funcretsym).refs=0))
) then
exit;
funcretloc:=current_procinfo.procdef.funcretloc[calleeside];
{ constructors return self }
if (current_procinfo.procdef.proctypeoption=potype_constructor) then
ressym:=tabstractnormalvarsym(current_procinfo.procdef.parast.Find('self'))
else
ressym:=tabstractnormalvarsym(current_procinfo.procdef.funcretsym);
if (ressym.refs>0) then
begin
{$ifdef OLDREGVARS}
case ressym.localloc.loc of
LOC_CFPUREGISTER,
LOC_FPUREGISTER:
begin
location_reset(restmploc,LOC_CFPUREGISTER,funcretloc^.size);
restmploc.register:=ressym.localloc.register;
end;
LOC_CREGISTER,
LOC_REGISTER:
begin
location_reset(restmploc,LOC_CREGISTER,funcretloc^.size);
restmploc.register:=ressym.localloc.register;
end;
LOC_MMREGISTER:
begin
location_reset(restmploc,LOC_CMMREGISTER,funcretloc^.size);
restmploc.register:=ressym.localloc.register;
end;
LOC_REFERENCE:
begin
location_reset(restmploc,LOC_REFERENCE,funcretloc^.size);
restmploc.reference:=ressym.localloc.reference;
end;
else
internalerror(200309184);
end;
{$else}
restmploc:=ressym.localloc;
{$endif}
{ Here, we return the function result. In most architectures, the value is
passed into the FUNCTION_RETURN_REG, but in a windowed architecure like sparc a
function returns in a register and the caller receives it in an other one }
case funcretloc.loc of
LOC_REGISTER:
begin
{$ifndef cpu64bit}
if current_procinfo.procdef.funcretloc[calleeside].size in [OS_64,OS_S64] then
begin
resloc:=current_procinfo.procdef.funcretloc[calleeside];
if resloc.loc<>LOC_REGISTER then
internalerror(200409141);
{ Load low and high register separate to generate better register
allocation info }
if getsupreg(resloc.register64.reglo)<first_int_imreg then
begin
cg.getcpuregister(list,resloc.register64.reglo);
end;
case restmploc.loc of
LOC_REFERENCE :
begin
href:=restmploc.reference;
if target_info.endian=ENDIAN_BIG then
inc(href.offset,4);
cg.a_load_ref_reg(list,OS_32,OS_32,href,resloc.register64.reglo);
end;
LOC_CREGISTER :
cg.a_load_reg_reg(list,OS_32,OS_32,restmploc.register64.reglo,resloc.register64.reglo);
else
internalerror(200409203);
end;
if getsupreg(resloc.register64.reghi)<first_int_imreg then
begin
cg.getcpuregister(list,resloc.register64.reghi);
end;
case restmploc.loc of
LOC_REFERENCE :
begin
href:=restmploc.reference;
if target_info.endian=ENDIAN_LITTLE then
inc(href.offset,4);
cg.a_load_ref_reg(list,OS_32,OS_32,href,resloc.register64.reghi);
end;
LOC_CREGISTER :
cg.a_load_reg_reg(list,OS_32,OS_32,restmploc.register64.reghi,resloc.register64.reghi);
else
internalerror(200409204);
end;
end
else
{$endif cpu64bit}
begin
hreg:=cg.makeregsize(list,funcretloc.register,funcretloc.size);
if getsupreg(funcretloc.register)<first_int_imreg then
begin
cg.getcpuregister(list,funcretloc.register);
end;
{ it could be that a structure is passed in memory but the function is expected to
return a pointer to this memory }
if paramanager.ret_in_param(current_procinfo.procdef.returndef,current_procinfo.procdef.proccalloption) then
cg.a_load_loc_reg(list,OS_ADDR,restmploc,hreg)
else
cg.a_load_loc_reg(list,restmploc.size,restmploc,hreg);
end;
end;
LOC_FPUREGISTER:
begin
if getsupreg(funcretloc.register)<first_fpu_imreg then
begin
cg.getcpuregister(list,funcretloc.register);
end;
{ we can't do direct moves between fpu and mm registers }
if restmploc.loc in [LOC_MMREGISTER,LOC_CMMREGISTER] then
location_force_fpureg(list,restmploc,false);
cg.a_loadfpu_loc_reg(list,funcretloc.size,restmploc,funcretloc.register);
end;
LOC_MMREGISTER:
begin
if getsupreg(funcretloc.register)<first_mm_imreg then
begin
cg.getcpuregister(list,funcretloc.register);
end;
cg.a_loadmm_loc_reg(list,restmploc.size,restmploc,funcretloc.register,mms_movescalar);
end;
LOC_INVALID,
LOC_REFERENCE:
;
else
internalerror(200405025);
end;
end
{$ifdef x86}
else
begin
{ the caller will pop a value off the cpu stack }
if (funcretloc.loc = LOC_FPUREGISTER) then
list.concat(taicpu.op_none(A_FLDZ));
end;
{$endif x86}
end;
procedure gen_alloc_regvar(list:TAsmList;sym: tabstractnormalvarsym);
begin
case sym.initialloc.loc of
LOC_CREGISTER:
begin
{$ifndef cpu64bit}
if sym.initialloc.size in [OS_64,OS_S64] then
begin
sym.initialloc.register64.reglo:=cg.getintregister(list,OS_32);
sym.initialloc.register64.reghi:=cg.getintregister(list,OS_32);
end
else
{$endif cpu64bit}
sym.initialloc.register:=cg.getintregister(list,sym.initialloc.size);
end;
LOC_CFPUREGISTER:
begin
sym.initialloc.register:=cg.getfpuregister(list,sym.initialloc.size);
end;
LOC_CMMREGISTER:
begin
sym.initialloc.register:=cg.getmmregister(list,sym.initialloc.size);
end;
end;
if (pi_has_goto in current_procinfo.flags) then
begin
{ Allocate register already, to prevent first allocation to be
inside a loop }
{$ifndef cpu64bit}
if sym.initialloc.size in [OS_64,OS_S64] then
begin
cg.a_reg_sync(list,sym.initialloc.register64.reglo);
cg.a_reg_sync(list,sym.initialloc.register64.reghi);
end
else
{$endif cpu64bit}
cg.a_reg_sync(list,sym.initialloc.register);
end;
sym.localloc:=sym.initialloc;
end;
procedure gen_load_para_value(list:TAsmList);
procedure get_para(const paraloc:TCGParaLocation);
begin
case paraloc.loc of
LOC_REGISTER :
begin
if getsupreg(paraloc.register)<first_int_imreg then
cg.getcpuregister(list,paraloc.register);
end;
LOC_MMREGISTER :
begin
if getsupreg(paraloc.register)<first_mm_imreg then
cg.getcpuregister(list,paraloc.register);
end;
LOC_FPUREGISTER :
begin
if getsupreg(paraloc.register)<first_fpu_imreg then
cg.getcpuregister(list,paraloc.register);
end;
end;
end;
procedure unget_para(const paraloc:TCGParaLocation);
begin
case paraloc.loc of
LOC_REGISTER :
begin
if getsupreg(paraloc.register)<first_int_imreg then
cg.ungetcpuregister(list,paraloc.register);
end;
LOC_MMREGISTER :
begin
if getsupreg(paraloc.register)<first_mm_imreg then
cg.ungetcpuregister(list,paraloc.register);
end;
LOC_FPUREGISTER :
begin
if getsupreg(paraloc.register)<first_fpu_imreg then
cg.ungetcpuregister(list,paraloc.register);
end;
end;
end;
procedure gen_load_ref(const paraloc:TCGParaLocation;const ref:treference;sizeleft:aint);
var
href : treference;
begin
case paraloc.loc of
LOC_REGISTER :
begin
{$IFDEF POWERPC64}
if (paraloc.shiftval <> 0) then
cg.a_op_const_reg_reg(list, OP_SHL, OS_INT, paraloc.shiftval, paraloc.register, paraloc.register);
{$ENDIF POWERPC64}
cg.a_load_reg_ref(list,paraloc.size,paraloc.size,paraloc.register,ref);
end;
LOC_MMREGISTER :
cg.a_loadmm_reg_ref(list,paraloc.size,paraloc.size,paraloc.register,ref,mms_movescalar);
LOC_FPUREGISTER :
cg.a_loadfpu_reg_ref(list,paraloc.size,paraloc.size,paraloc.register,ref);
LOC_REFERENCE :
begin
reference_reset_base(href,paraloc.reference.index,paraloc.reference.offset);
{ use concatcopy, because it can also be a float which fails when
load_ref_ref is used. Don't copy data when the references are equal }
if not((href.base=ref.base) and (href.offset=ref.offset)) then
cg.g_concatcopy(list,href,ref,sizeleft);
end;
else
internalerror(2002081302);
end;
end;
procedure gen_load_reg(const paraloc:TCGParaLocation;reg:tregister);
var
href : treference;
begin
case paraloc.loc of
LOC_REGISTER :
cg.a_load_reg_reg(list,paraloc.size,paraloc.size,paraloc.register,reg);
LOC_MMREGISTER :
cg.a_loadmm_reg_reg(list,paraloc.size,paraloc.size,paraloc.register,reg,mms_movescalar);
LOC_FPUREGISTER :
cg.a_loadfpu_reg_reg(list,paraloc.size,paraloc.size,paraloc.register,reg);
LOC_REFERENCE :
begin
reference_reset_base(href,paraloc.reference.index,paraloc.reference.offset);
case getregtype(reg) of
R_INTREGISTER :
cg.a_load_ref_reg(list,paraloc.size,paraloc.size,href,reg);
R_FPUREGISTER :
cg.a_loadfpu_ref_reg(list,paraloc.size,paraloc.size,href,reg);
R_MMREGISTER :
cg.a_loadmm_ref_reg(list,paraloc.size,paraloc.size,href,reg,mms_movescalar);
else
internalerror(2004101012);
end;
end;
else
internalerror(2002081302);
end;
end;
var
i : longint;
currpara : tparavarsym;
paraloc : pcgparalocation;
href : treference;
sizeleft : aint;
{$if defined(sparc) or defined(arm)}
tempref : treference;
{$endif sparc}
begin
if (po_assembler in current_procinfo.procdef.procoptions) then
exit;
{ Allocate registers used by parameters }
for i:=0 to current_procinfo.procdef.paras.count-1 do
begin
currpara:=tparavarsym(current_procinfo.procdef.paras[i]);
paraloc:=currpara.paraloc[calleeside].location;
while assigned(paraloc) do
begin
if paraloc^.loc in [LOC_REGISTER,LOC_FPUREGISTER,LOC_MMREGISTER] then
get_para(paraloc^);
paraloc:=paraloc^.next;
end;
end;
{ Copy parameters to local references/registers }
for i:=0 to current_procinfo.procdef.paras.count-1 do
begin
currpara:=tparavarsym(current_procinfo.procdef.paras[i]);
paraloc:=currpara.paraloc[calleeside].location;
{ skip e.g. empty records }
if not assigned(paraloc) then
internalerror(200408203);
if (paraloc^.loc = LOC_VOID) then
continue;
case currpara.initialloc.loc of
LOC_REFERENCE :
begin
{ If the parameter location is reused we don't need to copy
anything }
if not paramanager.param_use_paraloc(currpara.paraloc[calleeside]) then
begin
href:=currpara.initialloc.reference;
sizeleft:=currpara.paraloc[calleeside].intsize;
while assigned(paraloc) do
begin
if (paraloc^.size=OS_NO) then
begin
{ Can only be a reference that contains the rest
of the parameter }
if (paraloc^.loc<>LOC_REFERENCE) or
assigned(paraloc^.next) then
internalerror(2005013010);
gen_load_ref(paraloc^,href,sizeleft);
inc(href.offset,sizeleft);
sizeleft:=0;
end
else
begin
gen_load_ref(paraloc^,href,tcgsize2size[paraloc^.size]);
inc(href.offset,TCGSize2Size[paraloc^.size]);
dec(sizeleft,TCGSize2Size[paraloc^.size]);
end;
unget_para(paraloc^);
paraloc:=paraloc^.next;
end;
end;
end;
LOC_CREGISTER :
begin
{$ifndef cpu64bit}
if (currpara.paraloc[calleeside].size in [OS_64,OS_S64]) and
is_64bit(currpara.vardef) then
begin
case paraloc^.loc of
LOC_REGISTER:
begin
if not assigned(paraloc^.next) then
internalerror(200410104);
if (target_info.endian=ENDIAN_BIG) then
begin
{ paraloc^ -> high
paraloc^.next -> low }
unget_para(paraloc^);
gen_alloc_regvar(list,currpara);
gen_load_reg(paraloc^,currpara.initialloc.register64.reghi);
unget_para(paraloc^.next^);
gen_load_reg(paraloc^.next^,currpara.initialloc.register64.reglo);
end
else
begin
{ paraloc^ -> low
paraloc^.next -> high }
unget_para(paraloc^);
gen_alloc_regvar(list,currpara);
gen_load_reg(paraloc^,currpara.initialloc.register64.reglo);
unget_para(paraloc^.next^);
gen_load_reg(paraloc^.next^,currpara.initialloc.register64.reghi);
end;
end;
LOC_REFERENCE:
begin
gen_alloc_regvar(list,currpara);
reference_reset_base(href,paraloc^.reference.index,paraloc^.reference.offset);
cg64.a_load64_ref_reg(list,href,currpara.initialloc.register64);
unget_para(paraloc^);
end;
else
internalerror(2005101501);
end
end
else
{$endif cpu64bit}
begin
if assigned(paraloc^.next) then
internalerror(200410105);
unget_para(paraloc^);
gen_alloc_regvar(list,currpara);
gen_load_reg(paraloc^,currpara.initialloc.register);
end;
end;
LOC_CFPUREGISTER :
begin
{$if defined(sparc) or defined(arm)}
{ Arm and Sparc passes floats in int registers, when loading to fpu register
we need a temp }
sizeleft := TCGSize2Size[currpara.initialloc.size];
tg.GetTemp(list,sizeleft,tt_normal,tempref);
href:=tempref;
while assigned(paraloc) do
begin
unget_para(paraloc^);
gen_load_ref(paraloc^,href,sizeleft);
inc(href.offset,TCGSize2Size[paraloc^.size]);
dec(sizeleft,TCGSize2Size[paraloc^.size]);
paraloc:=paraloc^.next;
end;
gen_alloc_regvar(list,currpara);
cg.a_loadfpu_ref_reg(list,currpara.initialloc.size,currpara.initialloc.size,tempref,currpara.initialloc.register);
tg.UnGetTemp(list,tempref);
{$else sparc}
unget_para(paraloc^);
gen_alloc_regvar(list,currpara);
gen_load_reg(paraloc^,currpara.initialloc.register);
if assigned(paraloc^.next) then
internalerror(200410109);
{$endif sparc}
end;
LOC_CMMREGISTER :
begin
unget_para(paraloc^);
gen_alloc_regvar(list,currpara);
gen_load_reg(paraloc^,currpara.initialloc.register);
{ data could come in two memory locations, for now
we simply ignore the sanity check (FK)
if assigned(paraloc^.next) then
internalerror(200410108);
}
end;
end;
end;
{ generate copies of call by value parameters, must be done before
the initialization and body is parsed because the refcounts are
incremented using the local copies }
current_procinfo.procdef.parast.SymList.ForEachCall(@copyvalueparas,list);
{$ifdef powerpc}
{ unget the register that contains the stack pointer before the procedure entry, }
{ which is used to access the parameters in their original callee-side location }
if (tppcprocinfo(current_procinfo).needs_frame_pointer) then
cg.a_reg_dealloc(list,NR_R12);
{$endif powerpc}
{$ifdef powerpc64}
{ unget the register that contains the stack pointer before the procedure entry, }
{ which is used to access the parameters in their original callee-side location }
if (tppcprocinfo(current_procinfo).needs_frame_pointer) then
cg.a_reg_dealloc(list, NR_OLD_STACK_POINTER_REG);
{$endif powerpc64}
end;
procedure gen_initialize_code(list:TAsmList);
begin
{ initialize local data like ansistrings }
case current_procinfo.procdef.proctypeoption of
potype_unitinit:
begin
{ this is also used for initialization of variables in a
program which does not have a globalsymtable }
if assigned(current_module.globalsymtable) then
TSymtable(current_module.globalsymtable).SymList.ForEachCall(@initialize_data,list);
TSymtable(current_module.localsymtable).SymList.ForEachCall(@initialize_data,list);
TSymtable(current_module.localsymtable).SymList.ForEachCall(@initialize_regvars,list);
end;
{ units have seperate code for initilization and finalization }
potype_unitfinalize: ;
{ program init/final is generated in separate procedure }
potype_proginit:
begin
TSymtable(current_module.localsymtable).SymList.ForEachCall(@initialize_regvars,list);
end;
else
begin
if (localvartrashing <> -1) and
not(po_assembler in current_procinfo.procdef.procoptions) then
current_procinfo.procdef.localst.SymList.ForEachCall(@trash_variable,list);
current_procinfo.procdef.localst.SymList.ForEachCall(@initialize_data,list);
end;
end;
{ initialisizes temp. ansi/wide string data }
inittempvariables(list);
{ initialize ansi/widesstring para's }
if not(po_assembler in current_procinfo.procdef.procoptions) then
current_procinfo.procdef.parast.SymList.ForEachCall(@init_paras,list);
{$ifdef OLDREGVARS}
load_regvars(list,nil);
{$endif OLDREGVARS}
end;
procedure gen_finalize_code(list:TAsmList);
begin
{$ifdef OLDREGVARS}
cleanup_regvars(list);
{$endif OLDREGVARS}
{ finalize temporary data }
finalizetempvariables(list);
{ finalize local data like ansistrings}
case current_procinfo.procdef.proctypeoption of
potype_unitfinalize:
begin
{ this is also used for initialization of variables in a
program which does not have a globalsymtable }
if assigned(current_module.globalsymtable) then
TSymtable(current_module.globalsymtable).SymList.ForEachCall(@finalize_static_data,list);
TSymtable(current_module.localsymtable).SymList.ForEachCall(@finalize_static_data,list);
end;
{ units/progs have separate code for initialization and finalization }
potype_unitinit: ;
{ program init/final is generated in separate procedure }
potype_proginit: ;
else
current_procinfo.procdef.localst.SymList.ForEachCall(@finalize_local_vars,list);
end;
{ finalize paras data }
if assigned(current_procinfo.procdef.parast) and
not(po_assembler in current_procinfo.procdef.procoptions) then
current_procinfo.procdef.parast.SymList.ForEachCall(@final_paras,list);
end;
procedure gen_entry_code(list:TAsmList);
var
paraloc1,
paraloc2 : tcgpara;
begin
paraloc1.init;
paraloc2.init;
{ the actual profile code can clobber some registers,
therefore if the context must be saved, do it before
the actual call to the profile code
}
if (cs_profile in current_settings.moduleswitches) and
not(po_assembler in current_procinfo.procdef.procoptions) then
begin
{ non-win32 can call mcout even in main }
if not (target_info.system in [system_i386_win32,system_i386_wdosx]) or
not (current_procinfo.procdef.proctypeoption=potype_proginit) then
begin
cg.g_profilecode(list);
end;
end;
{ call startup helpers from main program }
if (current_procinfo.procdef.proctypeoption=potype_proginit) then
begin
{ initialize units }
cg.allocallcpuregisters(list);
cg.a_call_name(list,'FPC_INITIALIZEUNITS');
cg.deallocallcpuregisters(list);
end;
list.concat(Tai_force_line.Create);
{$ifdef OLDREGVARS}
load_regvars(list,nil);
{$endif OLDREGVARS}
paraloc1.done;
paraloc2.done;
end;
procedure gen_exit_code(list:TAsmList);
begin
{ call __EXIT for main program }
if (not DLLsource) and
(current_procinfo.procdef.proctypeoption=potype_proginit) then
cg.a_call_name(list,'FPC_DO_EXIT');
end;
{****************************************************************************
Entry/Exit
****************************************************************************}
function has_alias_name(pd:tprocdef;const s:string):boolean;
var
item : TCmdStrListItem;
begin
result:=true;
if pd.mangledname=s then
exit;
item := TCmdStrListItem(pd.aliasnames.first);
while assigned(item) do
begin
if item.str=s then
exit;
item := TCmdStrListItem(item.next);
end;
result:=false;
end;
procedure alloc_proc_symbol(pd: tprocdef);
var
item : TCmdStrListItem;
begin
item := TCmdStrListItem(pd.aliasnames.first);
while assigned(item) do
begin
current_asmdata.DefineAsmSymbol(item.str,AB_GLOBAL,AT_FUNCTION);
item := TCmdStrListItem(item.next);
end;
end;
procedure gen_proc_symbol(list:TAsmList);
var
item : TCmdStrListItem;
begin
item := TCmdStrListItem(current_procinfo.procdef.aliasnames.first);
while assigned(item) do
begin
if (cs_profile in current_settings.moduleswitches) or
(po_global in current_procinfo.procdef.procoptions) then
list.concat(Tai_symbol.createname_global(item.str,AT_FUNCTION,0))
else
list.concat(Tai_symbol.createname(item.str,AT_FUNCTION,0));
if tf_use_function_relative_addresses in target_info.flags then
list.concat(Tai_function_name.create(item.str));
item := TCmdStrListItem(item.next);
end;
current_procinfo.procdef.procstarttai:=tai(list.last);
end;
procedure gen_proc_symbol_end(list:TAsmList);
begin
list.concat(Tai_symbol_end.Createname(current_procinfo.procdef.mangledname));
current_procinfo.procdef.procendtai:=tai(list.last);
{ finalisation marker for Mac OS X }
if (target_info.system in [system_powerpc_darwin,system_i386_darwin]) and
(current_module.islibrary) and
(((current_module.flags and uf_finalize)<>0) or
(current_procinfo.procdef.proctypeoption = potype_proginit)) then
begin
if (current_procinfo.procdef.proctypeoption = potype_proginit) then
list.concat(tai_directive.create(asd_mod_init_func,''))
else
list.concat(tai_directive.create(asd_mod_term_func,''));
list.concat(tai_align.create(4));
list.concat(Tai_const.Createname(current_procinfo.procdef.mangledname,0));
end;
if (current_procinfo.procdef.proctypeoption=potype_proginit) then
begin
if (target_info.system in [system_powerpc_darwin,system_i386_darwin,system_powerpc_macos]) and
not(current_module.islibrary) then
begin
list.concat(tai_section.create(sec_code,'',4));
list.concat(tai_symbol.createname_global(
target_info.cprefix+mainaliasname,AT_FUNCTION,0));
{ keep argc, argv and envp properly on the stack }
cg.a_jmp_name(list,target_info.cprefix+'FPC_SYSTEMMAIN');
end;
end;
end;
procedure gen_proc_entry_code(list:TAsmList);
var
hitemp,
lotemp : longint;
begin
{ generate call frame marker for dwarf call frame info }
current_asmdata.asmcfi.start_frame(list);
{ All temps are know, write offsets used for information }
if (cs_asm_source in current_settings.globalswitches) then
begin
if tg.direction>0 then
begin
lotemp:=current_procinfo.tempstart;
hitemp:=tg.lasttemp;
end
else
begin
lotemp:=tg.lasttemp;
hitemp:=current_procinfo.tempstart;
end;
list.concat(Tai_comment.Create(strpnew('Temps allocated between '+std_regname(current_procinfo.framepointer)+
tostr_with_plus(lotemp)+' and '+std_regname(current_procinfo.framepointer)+tostr_with_plus(hitemp))));
end;
{ generate target specific proc entry code }
cg.g_proc_entry(list,current_procinfo.calc_stackframe_size,(po_nostackframe in current_procinfo.procdef.procoptions));
end;
procedure gen_proc_exit_code(list:TAsmList);
var
parasize : longint;
begin
{ c style clearstack does not need to remove parameters from the stack, only the
return value when it was pushed by arguments }
if current_procinfo.procdef.proccalloption in clearstack_pocalls then
begin
parasize:=0;
if paramanager.ret_in_param(current_procinfo.procdef.returndef,current_procinfo.procdef.proccalloption) then
inc(parasize,sizeof(aint));
end
else
parasize:=current_procinfo.para_stack_size;
{ generate target specific proc exit code }
cg.g_proc_exit(list,parasize,(po_nostackframe in current_procinfo.procdef.procoptions));
{ release return registers, needed for optimizer }
if not is_void(current_procinfo.procdef.returndef) then
location_free(list,current_procinfo.procdef.funcretloc[calleeside]);
{ end of frame marker for call frame info }
current_asmdata.asmcfi.end_frame(list);
end;
procedure gen_stack_check_size_para(list:TAsmList);
var
paraloc1 : tcgpara;
begin
paraloc1.init;
paramanager.getintparaloc(pocall_default,1,paraloc1);
paramanager.allocparaloc(list,paraloc1);
cg.a_param_const(list,OS_INT,current_procinfo.calc_stackframe_size,paraloc1);
paramanager.freeparaloc(list,paraloc1);
paraloc1.done;
end;
procedure gen_stack_check_call(list:TAsmList);
var
paraloc1 : tcgpara;
begin
paraloc1.init;
{ Also alloc the register needed for the parameter }
paramanager.getintparaloc(pocall_default,1,paraloc1);
paramanager.allocparaloc(list,paraloc1);
paramanager.freeparaloc(list,paraloc1);
{ Call the helper }
cg.allocallcpuregisters(list);
cg.a_call_name(list,'FPC_STACKCHECK');
cg.deallocallcpuregisters(list);
paraloc1.done;
end;
procedure gen_save_used_regs(list:TAsmList);
begin
{ Pure assembler routines need to save the registers themselves }
if (po_assembler in current_procinfo.procdef.procoptions) then
exit;
{ oldfpccall expects all registers to be destroyed }
if current_procinfo.procdef.proccalloption<>pocall_oldfpccall then
cg.g_save_standard_registers(list);
end;
procedure gen_restore_used_regs(list:TAsmList);
begin
{ Pure assembler routines need to save the registers themselves }
if (po_assembler in current_procinfo.procdef.procoptions) then
exit;
{ oldfpccall expects all registers to be destroyed }
if current_procinfo.procdef.proccalloption<>pocall_oldfpccall then
cg.g_restore_standard_registers(list);
end;
procedure gen_got_load(list : TAsmList);
begin
{ if loading got is necessary for more cpus, it can be moved
to the cg }
{$ifdef i386}
{ allocate PIC register }
if (cs_create_pic in current_settings.moduleswitches) and
(tf_pic_uses_got in target_info.flags) and
(pi_needs_got in current_procinfo.flags) and
not(po_kylixlocal in current_procinfo.procdef.procoptions) then
begin
current_module.requires_ebx_pic_helper:=true;
cg.a_call_name_static(list,'fpc_geteipasebx');
list.concat(taicpu.op_sym_ofs_reg(A_ADD,S_L,current_asmdata.RefAsmSymbol('_GLOBAL_OFFSET_TABLE_'),0,NR_PIC_OFFSET_REG));
list.concat(tai_regalloc.alloc(NR_PIC_OFFSET_REG,nil));
{ ecx could be used in leave procedures }
current_procinfo.got:=NR_EBX;
end;
{$endif i386}
end;
{****************************************************************************
External handling
****************************************************************************}
procedure gen_external_stub(list:TAsmList;pd:tprocdef;const externalname:string);
var
ref : treference;
sym : tasmsymbol;
begin
{ add the procedure to the al_procedures }
maybe_new_object_file(list);
new_section(list,sec_code,lower(pd.mangledname),current_settings.alignment.procalign);
list.concat(Tai_align.create(current_settings.alignment.procalign));
if (po_global in pd.procoptions) then
list.concat(Tai_symbol.createname_global(pd.mangledname,AT_FUNCTION,0))
else
list.concat(Tai_symbol.createname(pd.mangledname,AT_FUNCTION,0));
{$ifdef x86}
{ fix this for other CPUs as well }
sym:=current_asmdata.RefAsmSymbol(externalname);
reference_reset_symbol(ref,sym,0);
{ create pic'ed? }
if cs_create_pic in current_settings.moduleswitches then
begin
{ it could be that we're called from a procedure not having the
got loaded
}
gen_got_load(list);
ref.refaddr:=addr_pic;
end
else
ref.refaddr:=addr_full;
list.concat(taicpu.op_ref(A_JMP,S_NO,ref));
{$else x86}
cg.a_jmp_name(list,externalname);
{$endif x86}
end;
{****************************************************************************
Const Data
****************************************************************************}
procedure insertbssdata(sym : tstaticvarsym);
var
l : aint;
varalign : shortint;
storefilepos : tfileposinfo;
list : TAsmList;
sectype : TAsmSectiontype;
begin
storefilepos:=current_filepos;
current_filepos:=sym.fileinfo;
l:=sym.getsize;
if tf_section_threadvars in target_info.flags then
begin
if (vo_is_thread_var in sym.varoptions) then
begin
list:=current_asmdata.asmlists[al_threadvars];
sectype:=sec_threadvar;
end
else
begin
list:=current_asmdata.asmlists[al_globals];
sectype:=sec_bss;
end;
end
else
begin
if (vo_is_thread_var in sym.varoptions) then
inc(l,sizeof(aint));
list:=current_asmdata.asmlists[al_globals];
sectype:=sec_bss;
end;
varalign:=var_align(size_2_align(l));
maybe_new_object_file(list);
new_section(list,sectype,lower(sym.mangledname),varalign);
if (sym.owner.symtabletype=globalsymtable) or
maybe_smartlink_symbol or
DLLSource or
(assigned(current_procinfo) and
(po_inline in current_procinfo.procdef.procoptions)) or
(vo_is_public in sym.varoptions) then
list.concat(Tai_datablock.create_global(sym.mangledname,l))
else
list.concat(Tai_datablock.create(sym.mangledname,l));
current_filepos:=storefilepos;
end;
procedure gen_alloc_symtable(list:TAsmList;st:TSymtable);
procedure setlocalloc(vs:tabstractnormalvarsym);
begin
if cs_asm_source in current_settings.globalswitches then
begin
case vs.initialloc.loc of
LOC_REFERENCE :
begin
if not assigned(vs.initialloc.reference.symbol) then
list.concat(Tai_comment.Create(strpnew('Var '+vs.realname+' located at '+
std_regname(vs.initialloc.reference.base)+tostr_with_plus(vs.initialloc.reference.offset))));
end;
end;
end;
vs.localloc:=vs.initialloc;
end;
var
i : longint;
sym : tsym;
vs : tabstractnormalvarsym;
isaddr : boolean;
begin
for i:=0 to st.SymList.Count-1 do
begin
sym:=tsym(st.SymList[i]);
case sym.typ of
staticvarsym :
begin
vs:=tabstractnormalvarsym(sym);
{ The code in laodnode.pass_generatecode will create the
LOC_REFERENCE instead for all none register variables. This is
required because we can't store an asmsymbol in the localloc because
the asmsymbol is invalid after an unit is compiled. This gives
problems when this procedure is inlined in an other unit (PFV) }
if vs.is_regvar(false) then
begin
vs.initialloc.loc:=tvarregable2tcgloc[vs.varregable];
vs.initialloc.size:=def_cgsize(vs.vardef);
gen_alloc_regvar(list,vs);
setlocalloc(vs);
end;
end;
paravarsym :
begin
vs:=tabstractnormalvarsym(sym);
{ Parameters passed to assembler procedures need to be kept
in the original location }
if (po_assembler in current_procinfo.procdef.procoptions) then
tparavarsym(vs).paraloc[calleeside].get_location(vs.initialloc)
else
begin
isaddr:=paramanager.push_addr_param(vs.varspez,vs.vardef,current_procinfo.procdef.proccalloption);
if isaddr then
vs.initialloc.size:=OS_ADDR
else
vs.initialloc.size:=def_cgsize(vs.vardef);
if vs.is_regvar(isaddr) then
vs.initialloc.loc:=tvarregable2tcgloc[vs.varregable]
else
begin
vs.initialloc.loc:=LOC_REFERENCE;
{ Reuse the parameter location for values to are at a single location on the stack }
if paramanager.param_use_paraloc(tparavarsym(sym).paraloc[calleeside]) then
begin
reference_reset_base(vs.initialloc.reference,tparavarsym(sym).paraloc[calleeside].location^.reference.index,
tparavarsym(sym).paraloc[calleeside].location^.reference.offset);
end
else
begin
if isaddr then
tg.GetLocal(list,sizeof(aint),voidpointertype,vs.initialloc.reference)
else
tg.GetLocal(list,vs.getsize,tparavarsym(sym).paraloc[calleeside].alignment,vs.vardef,vs.initialloc.reference);
end;
end;
end;
setlocalloc(vs);
end;
localvarsym :
begin
vs:=tabstractnormalvarsym(sym);
vs.initialloc.size:=def_cgsize(vs.vardef);
if (m_delphi in current_settings.modeswitches) and
(po_assembler in current_procinfo.procdef.procoptions) and
(vo_is_funcret in vs.varoptions) and
(vs.refs=0) then
begin
{ not referenced, so don't allocate. Use dummy to }
{ avoid ie's later on because of LOC_INVALID }
vs.initialloc.loc:=LOC_REGISTER;
vs.initialloc.size:=OS_INT;
vs.initialloc.register:=NR_FUNCTION_RESULT_REG;
end
else if vs.is_regvar(false) then
begin
vs.initialloc.loc:=tvarregable2tcgloc[vs.varregable];
gen_alloc_regvar(list,vs);
end
else
begin
vs.initialloc.loc:=LOC_REFERENCE;
tg.GetLocal(list,vs.getsize,vs.vardef,vs.initialloc.reference);
end;
setlocalloc(vs);
end;
end;
end;
end;
procedure add_regvars(var rv: tusedregvars; const location: tlocation);
begin
case location.loc of
LOC_CREGISTER:
{$ifndef cpu64bit}
if location.size in [OS_64,OS_S64] then
begin
rv.intregvars.addnodup(getsupreg(location.register64.reglo));
rv.intregvars.addnodup(getsupreg(location.register64.reghi));
end
else
{$endif cpu64bit}
rv.intregvars.addnodup(getsupreg(location.register));
LOC_CFPUREGISTER:
rv.fpuregvars.addnodup(getsupreg(location.register));
LOC_CMMREGISTER:
rv.mmregvars.addnodup(getsupreg(location.register));
end;
end;
function do_get_used_regvars(var n: tnode; arg: pointer): foreachnoderesult;
var
rv: pusedregvars absolute arg;
begin
case (n.nodetype) of
temprefn:
{ We only have to synchronise a tempnode before a loop if it is }
{ not created inside the loop, and only synchronise after the }
{ loop if it's not destroyed inside the loop. If it's created }
{ before the loop and not yet destroyed, then before the loop }
{ is secondpassed tempinfo^.valid will be true, and we get the }
{ correct registers. If it's not destroyed inside the loop, }
{ then after the loop has been secondpassed tempinfo^.valid }
{ be true and we also get the right registers. In other cases, }
{ tempinfo^.valid will be false and so we do not add }
{ unnecessary registers. This way, we don't have to look at }
{ tempcreate and tempdestroy nodes to get this info (JM) }
if (ttemprefnode(n).tempinfo^.valid) then
add_regvars(rv^,ttemprefnode(n).tempinfo^.location);
loadn:
if (tloadnode(n).symtableentry.typ in [staticvarsym,localvarsym,paravarsym]) then
add_regvars(rv^,tabstractnormalvarsym(tloadnode(n).symtableentry).localloc);
vecn:
{ range checks sometimes need the high parameter }
if (cs_check_range in current_settings.localswitches) and
(is_open_array(tvecnode(n).left.resultdef) or
is_array_of_const(tvecnode(n).left.resultdef)) and
not(current_procinfo.procdef.proccalloption in [pocall_cdecl,pocall_cppdecl]) then
add_regvars(rv^,tabstractnormalvarsym(get_high_value_sym(tparavarsym(tloadnode(tvecnode(n).left).symtableentry))).localloc)
end;
result := fen_true;
end;
procedure get_used_regvars(n: tnode; var rv: tusedregvars);
begin
foreachnodestatic(n,@do_get_used_regvars,@rv);
end;
(*
See comments at declaration of pusedregvarscommon
function do_get_used_regvars_common(var n: tnode; arg: pointer): foreachnoderesult;
var
rv: pusedregvarscommon absolute arg;
begin
if (n.nodetype = loadn) and
(tloadnode(n).symtableentry.typ in [staticvarsym,localvarsym,paravarsym]) then
with tabstractnormalvarsym(tloadnode(n).symtableentry).localloc do
case loc of
LOC_CREGISTER:
{ if not yet encountered in this node tree }
if (rv^.myregvars.intregvars.addnodup(getsupreg(register))) and
{ but nevertheless already encountered somewhere }
not(rv^.allregvars.intregvars.addnodup(getsupreg(register))) then
{ then it's a regvar used in two or more node trees }
rv^.commonregvars.intregvars.addnodup(getsupreg(register));
LOC_CFPUREGISTER:
if (rv^.myregvars.intregvars.addnodup(getsupreg(register))) and
not(rv^.allregvars.intregvars.addnodup(getsupreg(register))) then
rv^.commonregvars.intregvars.addnodup(getsupreg(register));
LOC_CMMREGISTER:
if (rv^.myregvars.intregvars.addnodup(getsupreg(register))) and
not(rv^.allregvars.intregvars.addnodup(getsupreg(register))) then
rv^.commonregvars.intregvars.addnodup(getsupreg(register));
end;
result := fen_true;
end;
procedure get_used_regvars_common(n: tnode; var rv: tusedregvarscommon);
begin
rv.myregvars.intregvars.clear;
rv.myregvars.fpuregvars.clear;
rv.myregvars.mmregvars.clear;
foreachnodestatic(n,@do_get_used_regvars_common,@rv);
end;
*)
procedure gen_sync_regvars(list:TAsmList; var rv: tusedregvars);
var
count: longint;
begin
for count := 1 to rv.intregvars.length do
cg.a_reg_sync(list,newreg(R_INTREGISTER,rv.intregvars.readidx(count-1),R_SUBWHOLE));
for count := 1 to rv.fpuregvars.length do
cg.a_reg_sync(list,newreg(R_FPUREGISTER,rv.fpuregvars.readidx(count-1),R_SUBWHOLE));
for count := 1 to rv.mmregvars.length do
cg.a_reg_sync(list,newreg(R_MMREGISTER,rv.mmregvars.readidx(count-1),R_SUBWHOLE));
end;
{*****************************************************************************
SSA support
*****************************************************************************}
type
preplaceregrec = ^treplaceregrec;
treplaceregrec = record
old, new: tregister;
{$ifndef cpu64bit}
oldhi, newhi: tregister;
{$endif cpu64bit}
ressym: tsym;
end;
function doreplace(var n: tnode; para: pointer): foreachnoderesult;
var
rr: preplaceregrec absolute para;
begin
result := fen_false;
case n.nodetype of
loadn:
begin
if (tabstractvarsym(tloadnode(n).symtableentry).varoptions * [vo_is_dll_var, vo_is_thread_var] = []) and
not assigned(tloadnode(n).left) and
(((tloadnode(n).symtableentry <> rr^.ressym) and
not(vo_is_funcret in tabstractvarsym(tloadnode(n).symtableentry).varoptions)) or
not(fc_exit in flowcontrol)) and
(tabstractnormalvarsym(tloadnode(n).symtableentry).localloc.loc in [LOC_CREGISTER,LOC_CFPUREGISTER,LOC_CMMXREGISTER,LOC_CMMREGISTER]) and
(tabstractnormalvarsym(tloadnode(n).symtableentry).localloc.register = rr^.old) then
begin
{$ifndef cpu64bit}
{ it's possible a 64 bit location was shifted and/xor typecasted }
{ in a 32 bit value, so only 1 register was left in the location }
if (tabstractnormalvarsym(tloadnode(n).symtableentry).localloc.size in [OS_64,OS_S64]) then
if (tabstractnormalvarsym(tloadnode(n).symtableentry).localloc.register64.reghi = rr^.oldhi) then
tabstractnormalvarsym(tloadnode(n).symtableentry).localloc.register64.reghi := rr^.newhi
else
exit;
{$endif cpu64bit}
tabstractnormalvarsym(tloadnode(n).symtableentry).localloc.register := rr^.new;
result := fen_norecurse_true;
end;
end;
temprefn:
begin
if (ttemprefnode(n).tempinfo^.valid) and
(ttemprefnode(n).tempinfo^.location.loc in [LOC_CREGISTER,LOC_CFPUREGISTER,LOC_CMMXREGISTER,LOC_CMMREGISTER]) and
(ttemprefnode(n).tempinfo^.location.register = rr^.old) then
begin
{$ifndef cpu64bit}
{ it's possible a 64 bit location was shifted and/xor typecasted }
{ in a 32 bit value, so only 1 register was left in the location }
if (ttemprefnode(n).tempinfo^.location.size in [OS_64,OS_S64]) then
if (ttemprefnode(n).tempinfo^.location.register64.reghi = rr^.oldhi) then
ttemprefnode(n).tempinfo^.location.register64.reghi := rr^.newhi
else
exit;
{$endif cpu64bit}
ttemprefnode(n).tempinfo^.location.register := rr^.new;
result := fen_norecurse_true;
end;
end;
{ optimize the searching a bit }
derefn,addrn,
calln,inlinen,casen,
addn,subn,muln,
andn,orn,xorn,
ltn,lten,gtn,gten,equaln,unequaln,
slashn,divn,shrn,shln,notn,
inn,
asn,isn:
result := fen_norecurse_false;
end;
end;
procedure maybechangeloadnodereg(list: TAsmList; var n: tnode; reload: boolean);
var
rr: treplaceregrec;
begin
if not (n.location.loc in [LOC_CREGISTER,LOC_CFPUREGISTER,LOC_CMMXREGISTER,LOC_CMMREGISTER]) or
([fc_inflowcontrol,fc_gotolabel] * flowcontrol <> []) then
exit;
rr.old := n.location.register;
rr.ressym := nil;
{$ifndef cpu64bit}
rr.oldhi := NR_NO;
{$endif cpu64bit}
case n.location.loc of
LOC_CREGISTER:
begin
{$ifndef cpu64bit}
if (n.location.size in [OS_64,OS_S64]) then
begin
rr.oldhi := n.location.register64.reghi;
rr.new := cg.getintregister(current_asmdata.CurrAsmList,OS_INT);
rr.newhi := cg.getintregister(current_asmdata.CurrAsmList,OS_INT);
end
else
{$endif cpu64bit}
rr.new := cg.getintregister(current_asmdata.CurrAsmList,n.location.size);
end;
LOC_CFPUREGISTER:
rr.new := cg.getfpuregister(current_asmdata.CurrAsmList,n.location.size);
{$ifdef SUPPORT_MMX}
LOC_CMMXREGISTER:
rr.new := tcgx86(cg).getmmxregister(current_asmdata.CurrAsmList);
{$endif SUPPORT_MMX}
LOC_CMMREGISTER:
rr.new := cg.getmmregister(current_asmdata.CurrAsmList,n.location.size);
else
exit;
end;
if (current_procinfo.procdef.funcretloc[calleeside].loc<>LOC_VOID) and
assigned(current_procinfo.procdef.funcretsym) and
(tabstractvarsym(current_procinfo.procdef.funcretsym).refs <> 0) then
if (current_procinfo.procdef.proctypeoption=potype_constructor) then
rr.ressym:=tsym(current_procinfo.procdef.parast.Find('self'))
else
rr.ressym:=current_procinfo.procdef.funcretsym;
if not foreachnodestatic(n,@doreplace,@rr) then
exit;
if reload then
case n.location.loc of
LOC_CREGISTER:
begin
{$ifndef cpu64bit}
if (n.location.size in [OS_64,OS_S64]) then
cg64.a_load64_reg_reg(list,n.location.register64,joinreg64(rr.new,rr.newhi))
else
{$endif cpu64bit}
cg.a_load_reg_reg(list,n.location.size,n.location.size,n.location.register,rr.new);
end;
LOC_CFPUREGISTER:
cg.a_loadfpu_reg_reg(list,n.location.size,n.location.size,n.location.register,rr.new);
{$ifdef SUPPORT_MMX}
LOC_CMMXREGISTER:
cg.a_loadmm_reg_reg(list,OS_M64,OS_M64,n.location.register,rr.new,nil);
{$endif SUPPORT_MMX}
LOC_CMMREGISTER:
cg.a_loadmm_reg_reg(list,n.location.size,n.location.size,n.location.register,rr.new,nil);
else
internalerror(2006090920);
end;
{ now that we've change the loadn/temp, also change the node result location }
{$ifndef cpu64bit}
if (n.location.size in [OS_64,OS_S64]) then
begin
n.location.register64.reglo := rr.new;
n.location.register64.reghi := rr.newhi;
end
else
{$endif cpu64bit}
n.location.register := rr.new;
end;
procedure gen_free_symtable(list:TAsmList;st:TSymtable);
var
i : longint;
sym : tsym;
begin
for i:=0 to st.SymList.Count-1 do
begin
sym:=tsym(st.SymList[i]);
if (sym.typ in [staticvarsym,localvarsym,paravarsym]) then
begin
with tabstractnormalvarsym(sym) do
begin
{ Note: We need to keep the data available in memory
for the sub procedures that can access local data
in the parent procedures }
case localloc.loc of
LOC_CREGISTER :
{$ifndef cpu64bit}
if (pi_has_goto in current_procinfo.flags) then
if def_cgsize(vardef) in [OS_64,OS_S64] then
begin
cg.a_reg_sync(list,localloc.register64.reglo);
cg.a_reg_sync(list,localloc.register64.reghi);
end
else
{$endif cpu64bit}
cg.a_reg_sync(list,localloc.register);
LOC_CFPUREGISTER,
LOC_CMMREGISTER:
if (pi_has_goto in current_procinfo.flags) then
cg.a_reg_sync(list,localloc.register);
LOC_REFERENCE :
begin
if typ in [localvarsym,paravarsym] then
tg.Ungetlocal(list,localloc.reference);
end;
end;
end;
end;
end;
end;
procedure gen_intf_wrapper(list:TAsmList;_class:tobjectdef);
var
i,j : longint;
tmps : string;
pd : TProcdef;
ImplIntf : TImplementedInterface;
begin
for i:=0 to _class.ImplementedInterfaces.count-1 do
begin
ImplIntf:=TImplementedInterface(_class.ImplementedInterfaces[i]);
if (ImplIntf=ImplIntf.VtblImplIntf) and
assigned(ImplIntf.ProcDefs) then
begin
for j:=0 to ImplIntf.ProcDefs.Count-1 do
begin
pd:=TProcdef(ImplIntf.ProcDefs[j]);
tmps:=make_mangledname('WRPR',_class.owner,_class.objname^+'_$_'+
ImplIntf.IntfDef.objname^+'_$_'+tostr(j)+'_$_'+pd.mangledname);
{ create wrapper code }
new_section(list,sec_code,tmps,0);
cg.init_register_allocators;
cg.g_intf_wrapper(list,pd,tmps,ImplIntf.ioffset);
cg.done_register_allocators;
end;
end;
end;
end;
procedure gen_intf_wrappers(list:TAsmList;st:TSymtable);
var
i : longint;
def : tdef;
begin
for i:=0 to st.DefList.Count-1 do
begin
def:=tdef(st.DefList[i]);
if is_class(def) then
gen_intf_wrapper(list,tobjectdef(def));
end;
end;
procedure gen_load_vmt_register(list:TAsmList;objdef:tobjectdef;selfloc:tlocation;var vmtreg:tregister);
var
href : treference;
begin
if is_object(objdef) then
begin
case selfloc.loc of
LOC_CREFERENCE,
LOC_REFERENCE:
begin
reference_reset_base(href,cg.getaddressregister(list),objdef.vmt_offset);
cg.a_loadaddr_ref_reg(list,selfloc.reference,href.base);
end;
else
internalerror(200305056);
end;
end
else
begin
case selfloc.loc of
LOC_REGISTER:
begin
{$ifdef cpu_uses_separate_address_registers}
if getregtype(left.location.register)<>R_ADDRESSREGISTER then
begin
reference_reset_base(href,cg.getaddressregister(list),objdef.vmt_offset);
cg.a_load_reg_reg(list,OS_ADDR,OS_ADDR,selfloc.register,href.base);
end
else
{$endif cpu_uses_separate_address_registers}
reference_reset_base(href,selfloc.register,objdef.vmt_offset);
end;
LOC_CREGISTER,
LOC_CREFERENCE,
LOC_REFERENCE:
begin
reference_reset_base(href,cg.getaddressregister(list),objdef.vmt_offset);
cg.a_load_loc_reg(list,OS_ADDR,selfloc,href.base);
end;
else
internalerror(200305057);
end;
end;
vmtreg:=cg.getaddressregister(list);
cg.g_maybe_testself(list,href.base);
cg.a_load_ref_reg(list,OS_ADDR,OS_ADDR,href,vmtreg);
{ test validity of VMT }
if not(is_interface(objdef)) and
not(is_cppclass(objdef)) then
cg.g_maybe_testvmt(list,vmtreg,objdef);
end;
function getprocalign : shortint;
begin
{ gprof uses 16 byte granularity }
if (cs_profile in current_settings.moduleswitches) then
result:=16
else
result:=current_settings.alignment.procalign;
end;
procedure gen_pic_helpers(list : TAsmList);
var
href : treference;
begin
{ if other cpus require such helpers as well, it can be solved more cleaner }
{$ifdef i386}
if current_module.requires_ebx_pic_helper then
begin
new_section(list,sec_code,'fpc_geteipasebx',0);
list.concat(tai_symbol.Createname('fpc_geteipasebx',AT_FUNCTION,getprocalign));
reference_reset(href);
href.base:=NR_ESP;
list.concat(taicpu.op_ref_reg(A_MOV,S_L,href,NR_EBX));
list.concat(taicpu.op_none(A_RET,S_NO));
end;
if current_module.requires_ecx_pic_helper then
begin
new_section(list,sec_code,'fpc_geteipasecx',0);
list.concat(tai_symbol.Createname('fpc_geteipasecx',AT_FUNCTION,getprocalign));
reference_reset(href);
href.base:=NR_ESP;
list.concat(taicpu.op_ref_reg(A_MOV,S_L,href,NR_ECX));
list.concat(taicpu.op_none(A_RET,S_NO));
end;
{$endif i386}
end;
end.
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