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edb3124ae8
fpc/compiler/ncgutil.pas
Jonas Maebe edb3124ae8 * copy arrays passed by value to cdecl routines on the callee side even on 
platforms that normally must copy value parameters on the caller side,
    because
   o if we copy them on the caller side, then the behaviour will be different
     compared to other platforms if the called routine is implemented in C
     (since they are passed by reference, changes to the array contents will
      be visible on other platforms, while they wouldn't be visible if the
      copy is made on the caller side)
   o if we don't copy them on the caller nor on the callee side, then behaviour
     will be different compared to other platforms if the called routine is
     implemented in Pascal and modifies the array (since then changes won't be
     visible on the caller side, except on platforms that normally perform
     the copy on the caller side)

git-svn-id: trunk@29873 -
2015-02-23 22:50:29 +00:00

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{
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 cpu64bitalu}
,cg64f32
{$endif not cpu64bitalu}
;
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_mmreg(list:TAsmList;var l: tlocation;maybeconst:boolean);
procedure location_allocate_register(list:TAsmList;out l: tlocation;def: tdef;constant: boolean);
{ loads a cgpara into a tlocation; assumes that loc.loc is already
initialised }
procedure gen_load_cgpara_loc(list: TAsmList; vardef: tdef; const para: TCGPara; var destloc: tlocation; reusepara: boolean);
{ allocate registers for a tlocation; assumes that loc.loc is already
set to LOC_CREGISTER/LOC_CFPUREGISTER/... }
procedure gen_alloc_regloc(list:TAsmList;var loc: tlocation);
procedure register_maybe_adjust_setbase(list: TAsmList; var l: tlocation; setbase: aint);
function has_alias_name(pd:tprocdef;const s:string):boolean;
procedure alloc_proc_symbol(pd: tprocdef);
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_load_para_value(list:TAsmList);
procedure gen_external_stub(list:TAsmList;pd:tprocdef;const externalname:string);
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);
{ 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. }
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 gen_alloc_symtable(list:TAsmList;pd:tprocdef;st:TSymtable);
procedure gen_free_symtable(list:TAsmList;st:TSymtable);
procedure location_free(list: TAsmList; const location : TLocation);
function getprocalign : shortint;
procedure gen_fpc_dummy(list : TAsmList);
procedure gen_load_frame_for_exceptfilter(list : TAsmList);
implementation
uses
version,
cutils,cclasses,
globals,systems,verbose,export,
ppu,defutil,
procinfo,paramgr,fmodule,
regvars,dbgbase,
pass_1,pass_2,
nbas,ncon,nld,nmem,nutils,ngenutil,
tgobj,cgobj,cgcpu,hlcgobj,hlcgcpu
{$ifdef powerpc}
, cpupi
{$endif}
{$ifdef powerpc64}
, cpupi
{$endif}
{$ifdef SUPPORT_MMX}
, cgx86
{$endif SUPPORT_MMX}
;
{*****************************************************************************
Misc Helpers
*****************************************************************************}
{$if first_mm_imreg = 0}
{$WARN 4044 OFF} { Comparison might be always false ... }
{$endif}
procedure location_free(list: TAsmList; const location : TLocation);
begin
case location.loc of
LOC_VOID:
;
LOC_REGISTER,
LOC_CREGISTER:
begin
{$ifdef cpu64bitalu}
{ x86-64 system v abi:
structs with up to 16 bytes are returned in registers }
if location.size in [OS_128,OS_S128] then
begin
if getsupreg(location.register)<first_int_imreg then
cg.ungetcpuregister(list,location.register);
if getsupreg(location.registerhi)<first_int_imreg then
cg.ungetcpuregister(list,location.registerhi);
end
{$else cpu64bitalu}
if location.size in [OS_64,OS_S64] then
begin
if getsupreg(location.register64.reglo)<first_int_imreg then
cg.ungetcpuregister(list,location.register64.reglo);
if getsupreg(location.register64.reghi)<first_int_imreg then
cg.ungetcpuregister(list,location.register64.reghi);
end
{$endif cpu64bitalu}
else
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 paramanager.use_fixed_stack then
location_freetemp(list,location);
end;
else
internalerror(2004110211);
end;
end;
procedure firstcomplex(p : tbinarynode);
var
fcl, fcr: longint;
ncl, ncr: longint;
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(200709253);
end
else
begin
fcl:=node_resources_fpu(p.left);
fcr:=node_resources_fpu(p.right);
ncl:=node_complexity(p.left);
ncr:=node_complexity(p.right);
{ We swap left and right if
a) right needs more floating point registers than left, and
left needs more than 0 floating point registers (if it
doesn't need any, swapping won't change the floating
point register pressure)
b) both left and right need an equal amount of floating
point registers or right needs no floating point registers,
and in addition right has a higher complexity than left
(+- needs more integer registers, but not necessarily)
}
if ((fcr>fcl) and
(fcl>0)) or
(((fcr=fcl) or
(fcr=0)) and
(ncr>ncl)) then
p.swapleftright
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);
{$endif OLDREGVARS}
if is_constboolnode(p) then
begin
if Tordconstnode(p).value.uvalue<>0 then
cg.a_jmp_always(list,current_procinfo.CurrTrueLabel)
else
cg.a_jmp_always(list,current_procinfo.CurrFalseLabel)
end
else
begin
opsize:=def_cgsize(p.resultdef);
case p.location.loc of
LOC_SUBSETREG,LOC_CSUBSETREG,
LOC_SUBSETREF,LOC_CSUBSETREF:
begin
tmpreg := cg.getintregister(list,OS_INT);
hlcg.a_load_loc_reg(list,p.resultdef,osuinttype,p.location,tmpreg);
cg.a_cmp_const_reg_label(list,OS_INT,OC_NE,0,tmpreg,current_procinfo.CurrTrueLabel);
cg.a_jmp_always(list,current_procinfo.CurrFalseLabel);
end;
LOC_CREGISTER,LOC_REGISTER,LOC_CREFERENCE,LOC_REFERENCE :
begin
{$ifdef cpu64bitalu}
if opsize in [OS_128,OS_S128] then
begin
hlcg.location_force_reg(list,p.location,p.resultdef,cgsize_orddef(opsize),true);
tmpreg:=cg.getintregister(list,OS_64);
cg.a_op_reg_reg_reg(list,OP_OR,OS_64,p.location.register128.reglo,p.location.register128.reghi,tmpreg);
location_reset(p.location,LOC_REGISTER,OS_64);
p.location.register:=tmpreg;
opsize:=OS_64;
end;
{$else cpu64bitalu}
if opsize in [OS_64,OS_S64] then
begin
hlcg.location_force_reg(list,p.location,p.resultdef,cgsize_orddef(opsize),true);
tmpreg:=cg.getintregister(list,OS_32);
cg.a_op_reg_reg_reg(list,OP_OR,OS_32,p.location.register64.reglo,p.location.register64.reghi,tmpreg);
location_reset(p.location,LOC_REGISTER,OS_32);
p.location.register:=tmpreg;
opsize:=OS_32;
end;
{$endif cpu64bitalu}
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:
;
{$ifdef cpuflags}
LOC_FLAGS :
begin
cg.a_jmp_flags(list,p.location.resflags,current_procinfo.CurrTrueLabel);
cg.a_reg_dealloc(list,NR_DEFAULTFLAGS);
cg.a_jmp_always(list,current_procinfo.CurrFalseLabel);
end;
{$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
except_buf_size: longint;
begin
{ todo: is there a way to retrieve the except_buf_size from the size of
the TExceptAddr record from the system unit (like we do for jmp_buf_size),
without moving TExceptAddr to the interface part? }
except_buf_size:=voidpointertype.size*2+sizeof(pint);
get_jumpbuf_size;
tg.GetTemp(list,except_buf_size,sizeof(pint),tt_persistent,t.envbuf);
tg.GetTemp(list,jmp_buf_size,jmp_buf_align,tt_persistent,t.jmpbuf);
tg.GetTemp(list,sizeof(pint),sizeof(pint),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);
const
{$ifdef cpu16bitaddr}
pushexceptaddr_frametype_cgsize = OS_S16;
setjmp_result_cgsize = OS_S16;
{$else cpu16bitaddr}
pushexceptaddr_frametype_cgsize = OS_S32;
setjmp_result_cgsize = OS_S32;
{$endif cpu16bitaddr}
var
paraloc1,paraloc2,paraloc3 : tcgpara;
pd: tprocdef;
{$ifdef i8086}
tmpreg: TRegister;
{$endif i8086}
begin
pd:=search_system_proc('fpc_pushexceptaddr');
paraloc1.init;
paraloc2.init;
paraloc3.init;
paramanager.getintparaloc(pd,1,paraloc1);
paramanager.getintparaloc(pd,2,paraloc2);
paramanager.getintparaloc(pd,3,paraloc3);
if pd.is_pushleftright then
begin
{ push type of exceptionframe }
cg.a_load_const_cgpara(list,pushexceptaddr_frametype_cgsize,1,paraloc1);
cg.a_loadaddr_ref_cgpara(list,t.jmpbuf,paraloc2);
cg.a_loadaddr_ref_cgpara(list,t.envbuf,paraloc3);
end
else
begin
cg.a_loadaddr_ref_cgpara(list,t.envbuf,paraloc3);
cg.a_loadaddr_ref_cgpara(list,t.jmpbuf,paraloc2);
{ push type of exceptionframe }
cg.a_load_const_cgpara(list,pushexceptaddr_frametype_cgsize,1,paraloc1);
end;
paramanager.freecgpara(list,paraloc3);
paramanager.freecgpara(list,paraloc2);
paramanager.freecgpara(list,paraloc1);
cg.allocallcpuregisters(list);
cg.a_call_name(list,'FPC_PUSHEXCEPTADDR',false);
cg.deallocallcpuregisters(list);
pd:=search_system_proc('fpc_setjmp');
paramanager.getintparaloc(pd,1,paraloc1);
{$ifdef i8086}
if current_settings.x86memorymodel in x86_far_data_models then
begin
tmpreg:=cg.getintregister(list,OS_32);
cg.a_load_reg_reg(list,OS_16,OS_16,NR_FUNCTION_RESULT32_LOW_REG,tmpreg);
cg.a_load_reg_reg(list,OS_16,OS_16,NR_FUNCTION_RESULT32_HIGH_REG,GetNextReg(tmpreg));
cg.a_load_reg_cgpara(list,OS_32,tmpreg,paraloc1);
end
else
{$endif i8086}
cg.a_load_reg_cgpara(list,OS_ADDR,NR_FUNCTION_RESULT_REG,paraloc1);
paramanager.freecgpara(list,paraloc1);
cg.allocallcpuregisters(list);
cg.a_call_name(list,'FPC_SETJMP',false);
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,setjmp_result_cgsize,OC_NE,0,cg.makeregsize(list,NR_FUNCTION_RESULT_REG,setjmp_result_cgsize),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',false);
cg.deallocallcpuregisters(list);
if not onlyfree then
begin
{ g_exception_reason_load already allocates NR_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.a_reg_dealloc(list,NR_FUNCTION_RESULT_REG);
end;
end;
{*****************************************************************************
TLocation
*****************************************************************************}
procedure register_maybe_adjust_setbase(list: TAsmList; var l: tlocation; setbase: aint);
var
tmpreg: tregister;
begin
if (setbase<>0) then
begin
if not(l.loc in [LOC_REGISTER,LOC_CREGISTER]) then
internalerror(2007091502);
{ subtract the setbase }
case l.loc of
LOC_CREGISTER:
begin
tmpreg := cg.getintregister(list,l.size);
cg.a_op_const_reg_reg(list,OP_SUB,l.size,setbase,l.register,tmpreg);
l.loc:=LOC_REGISTER;
l.register:=tmpreg;
end;
LOC_REGISTER:
begin
cg.a_op_const_reg(list,OP_SUB,l.size,setbase,l.register);
end;
end;
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_allocate_register(list: TAsmList;out l: tlocation;def: tdef;constant: boolean);
begin
l.size:=def_cgsize(def);
if (def.typ=floatdef) and
not(cs_fp_emulation in current_settings.moduleswitches) then
begin
if use_vectorfpu(def) then
begin
if constant then
location_reset(l,LOC_CMMREGISTER,l.size)
else
location_reset(l,LOC_MMREGISTER,l.size);
l.register:=cg.getmmregister(list,l.size);
end
else
begin
if constant then
location_reset(l,LOC_CFPUREGISTER,l.size)
else
location_reset(l,LOC_FPUREGISTER,l.size);
l.register:=cg.getfpuregister(list,l.size);
end;
end
else
begin
if constant then
location_reset(l,LOC_CREGISTER,l.size)
else
location_reset(l,LOC_REGISTER,l.size);
{$ifdef cpu64bitalu}
if l.size in [OS_128,OS_S128,OS_F128] then
begin
l.register128.reglo:=cg.getintregister(list,OS_64);
l.register128.reghi:=cg.getintregister(list,OS_64);
end
else
{$else cpu64bitalu}
if l.size in [OS_64,OS_S64,OS_F64] then
begin
l.register64.reglo:=cg.getintregister(list,OS_32);
l.register64.reghi:=cg.getintregister(list,OS_32);
end
else
{$endif cpu64bitalu}
{ Note: for widths of records (and maybe objects, classes, etc.) an
address register could be set here, but that is later
changed to an intregister neverthless when in the
tcgassignmentnode thlcgobj.maybe_change_load_node_reg is
called for the temporary node; so the workaround for now is
to fix the symptoms... }
l.register:=cg.getintregister(list,l.size);
end;
end;
{****************************************************************************
Init/Finalize Code
****************************************************************************}
{ generates the code for incrementing the reference count of parameters and
initialize out parameters }
procedure init_paras(p:TObject;arg:pointer);
var
href : treference;
hsym : tparavarsym;
eldef : tdef;
list : TAsmList;
needs_inittable : boolean;
begin
list:=TAsmList(arg);
if (tsym(p).typ=paravarsym) then
begin
needs_inittable:=is_managed_type(tparavarsym(p).vardef);
if not needs_inittable then
exit;
case tparavarsym(p).varspez of
vs_value :
begin
{ variants are already handled by the call to fpc_variant_copy_overwrite if
they are passed by reference }
if not((tparavarsym(p).vardef.typ=variantdef) and
paramanager.push_addr_param(tparavarsym(p).varspez,tparavarsym(p).vardef,current_procinfo.procdef.proccalloption)) then
begin
hlcg.location_get_data_ref(list,tparavarsym(p).vardef,tparavarsym(p).initialloc,href,
is_open_array(tparavarsym(p).vardef) or
((target_info.system in systems_caller_copy_addr_value_para) and
paramanager.push_addr_param(vs_value,tparavarsym(p).vardef,current_procinfo.procdef.proccalloption)),
sizeof(pint));
if is_open_array(tparavarsym(p).vardef) then
begin
{ open arrays do not contain correct element count in their rtti,
the actual count must be passed separately. }
hsym:=tparavarsym(get_high_value_sym(tparavarsym(p)));
eldef:=tarraydef(tparavarsym(p).vardef).elementdef;
if not assigned(hsym) then
internalerror(201003031);
hlcg.g_array_rtti_helper(list,eldef,href,hsym.initialloc,'fpc_addref_array');
end
else
hlcg.g_incrrefcount(list,tparavarsym(p).vardef,href);
end;
end;
vs_out :
begin
{ we have no idea about the alignment at the callee side,
and the user also cannot specify "unaligned" here, so
assume worst case }
hlcg.location_get_data_ref(list,tparavarsym(p).vardef,tparavarsym(p).initialloc,href,true,1);
if is_open_array(tparavarsym(p).vardef) then
begin
hsym:=tparavarsym(get_high_value_sym(tparavarsym(p)));
eldef:=tarraydef(tparavarsym(p).vardef).elementdef;
if not assigned(hsym) then
internalerror(201103033);
hlcg.g_array_rtti_helper(list,eldef,href,hsym.initialloc,'fpc_initialize_array');
end
else
hlcg.g_initialize(list,tparavarsym(p).vardef,href);
end;
end;
end;
end;
procedure gen_alloc_regloc(list:TAsmList;var loc: tlocation);
begin
case loc.loc of
LOC_CREGISTER:
begin
{$ifdef cpu64bitalu}
if loc.size in [OS_128,OS_S128] then
begin
loc.register128.reglo:=cg.getintregister(list,OS_64);
loc.register128.reghi:=cg.getintregister(list,OS_64);
end
else
{$else cpu64bitalu}
if loc.size in [OS_64,OS_S64] then
begin
loc.register64.reglo:=cg.getintregister(list,OS_32);
loc.register64.reghi:=cg.getintregister(list,OS_32);
end
else
{$endif cpu64bitalu}
loc.register:=cg.getintregister(list,loc.size);
end;
LOC_CFPUREGISTER:
begin
loc.register:=cg.getfpuregister(list,loc.size);
end;
LOC_CMMREGISTER:
begin
loc.register:=cg.getmmregister(list,loc.size);
end;
end;
end;
procedure gen_alloc_regvar(list:TAsmList;sym: tabstractnormalvarsym; allocreg: boolean);
begin
if allocreg then
gen_alloc_regloc(list,sym.initialloc);
if (pi_has_label in current_procinfo.flags) then
begin
{ Allocate register already, to prevent first allocation to be
inside a loop }
{$if defined(cpu64bitalu)}
if sym.initialloc.size in [OS_128,OS_S128] then
begin
cg.a_reg_sync(list,sym.initialloc.register128.reglo);
cg.a_reg_sync(list,sym.initialloc.register128.reghi);
end
else
{$elseif defined(cpu32bitalu)}
if sym.initialloc.size in [OS_64,OS_S64] then
begin
cg.a_reg_sync(list,sym.initialloc.register64.reglo);
cg.a_reg_sync(list,sym.initialloc.register64.reghi);
end
else
{$elseif defined(cpu16bitalu)}
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,GetNextReg(sym.initialloc.register64.reglo));
cg.a_reg_sync(list,sym.initialloc.register64.reghi);
cg.a_reg_sync(list,GetNextReg(sym.initialloc.register64.reghi));
end
else
if sym.initialloc.size in [OS_32,OS_S32] then
begin
cg.a_reg_sync(list,sym.initialloc.register);
cg.a_reg_sync(list,GetNextReg(sym.initialloc.register));
end
else
{$elseif defined(cpu8bitalu)}
if sym.initialloc.size in [OS_64,OS_S64] then
begin
cg.a_reg_sync(list,sym.initialloc.register64.reglo);
cg.a_reg_sync(list,GetNextReg(sym.initialloc.register64.reglo));
cg.a_reg_sync(list,GetNextReg(GetNextReg(sym.initialloc.register64.reglo)));
cg.a_reg_sync(list,GetNextReg(GetNextReg(GetNextReg(sym.initialloc.register64.reglo))));
cg.a_reg_sync(list,sym.initialloc.register64.reghi);
cg.a_reg_sync(list,GetNextReg(sym.initialloc.register64.reghi));
cg.a_reg_sync(list,GetNextReg(GetNextReg(sym.initialloc.register64.reghi)));
cg.a_reg_sync(list,GetNextReg(GetNextReg(GetNextReg(sym.initialloc.register64.reghi))));
end
else
if sym.initialloc.size in [OS_32,OS_S32] then
begin
cg.a_reg_sync(list,sym.initialloc.register);
cg.a_reg_sync(list,GetNextReg(sym.initialloc.register));
cg.a_reg_sync(list,GetNextReg(GetNextReg(sym.initialloc.register)));
cg.a_reg_sync(list,GetNextReg(GetNextReg(GetNextReg(sym.initialloc.register))));
end
else
if sym.initialloc.size in [OS_16,OS_S16] then
begin
cg.a_reg_sync(list,sym.initialloc.register);
cg.a_reg_sync(list,GetNextReg(sym.initialloc.register));
end
else
{$endif}
cg.a_reg_sync(list,sym.initialloc.register);
end;
sym.localloc:=sym.initialloc;
end;
procedure gen_load_cgpara_loc(list: TAsmList; vardef: tdef; const para: TCGPara; var destloc: tlocation; reusepara: boolean);
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;
var
paraloc : pcgparalocation;
href : treference;
sizeleft : aint;
alignment : longint;
tempref : treference;
{$ifdef mips}
tmpreg : tregister;
{$endif mips}
{$ifndef cpu64bitalu}
tempreg : tregister;
reg64 : tregister64;
{$endif not cpu64bitalu}
begin
paraloc:=para.location;
if not assigned(paraloc) then
internalerror(200408203);
{ skip e.g. empty records }
if (paraloc^.loc = LOC_VOID) then
exit;
case destloc.loc of
LOC_REFERENCE :
begin
{ If the parameter location is reused we don't need to copy
anything }
if not reusepara then
begin
href:=destloc.reference;
sizeleft:=para.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);
cg.a_load_cgparaloc_ref(list,paraloc^,href,sizeleft,destloc.reference.alignment);
inc(href.offset,sizeleft);
sizeleft:=0;
end
else
begin
cg.a_load_cgparaloc_ref(list,paraloc^,href,tcgsize2size[paraloc^.size],destloc.reference.alignment);
inc(href.offset,TCGSize2Size[paraloc^.size]);
dec(sizeleft,TCGSize2Size[paraloc^.size]);
end;
unget_para(paraloc^);
paraloc:=paraloc^.next;
end;
end;
end;
LOC_REGISTER,
LOC_CREGISTER :
begin
{$ifdef cpu64bitalu}
if (para.size in [OS_128,OS_S128,OS_F128]) and
({ in case of fpu emulation, or abi's that pass fpu values
via integer registers }
(vardef.typ=floatdef) or
is_methodpointer(vardef) or
is_record(vardef)) then
begin
case paraloc^.loc of
LOC_REGISTER:
begin
if not assigned(paraloc^.next) then
internalerror(200410104);
if (target_info.endian=ENDIAN_BIG) then
begin
{ paraloc^ -> high
paraloc^.next -> low }
unget_para(paraloc^);
gen_alloc_regloc(list,destloc);
{ reg->reg, alignment is irrelevant }
cg.a_load_cgparaloc_anyreg(list,OS_64,paraloc^,destloc.register128.reghi,8);
unget_para(paraloc^.next^);
cg.a_load_cgparaloc_anyreg(list,OS_64,paraloc^.next^,destloc.register128.reglo,8);
end
else
begin
{ paraloc^ -> low
paraloc^.next -> high }
unget_para(paraloc^);
gen_alloc_regloc(list,destloc);
cg.a_load_cgparaloc_anyreg(list,OS_64,paraloc^,destloc.register128.reglo,8);
unget_para(paraloc^.next^);
cg.a_load_cgparaloc_anyreg(list,OS_64,paraloc^.next^,destloc.register128.reghi,8);
end;
end;
LOC_REFERENCE:
begin
gen_alloc_regloc(list,destloc);
reference_reset_base(href,paraloc^.reference.index,paraloc^.reference.offset,para.alignment);
cg128.a_load128_ref_reg(list,href,destloc.register128);
unget_para(paraloc^);
end;
else
internalerror(2012090607);
end
end
else
{$else cpu64bitalu}
if (para.size in [OS_64,OS_S64,OS_F64]) and
(is_64bit(vardef) or
{ in case of fpu emulation, or abi's that pass fpu values
via integer registers }
(vardef.typ=floatdef) or
is_methodpointer(vardef) or
is_record(vardef)) then
begin
case paraloc^.loc of
LOC_REGISTER:
begin
case para.locations_count of
{$if defined(cpu16bitalu) or defined(cpu8bitalu)}
{ 4 paralocs? }
4:
if (target_info.endian=ENDIAN_BIG) then
begin
{ paraloc^ -> high
paraloc^.next^.next -> low }
unget_para(paraloc^);
gen_alloc_regloc(list,destloc);
{ reg->reg, alignment is irrelevant }
cg.a_load_cgparaloc_anyreg(list,OS_16,paraloc^,GetNextReg(destloc.register64.reghi),2);
unget_para(paraloc^.next^);
cg.a_load_cgparaloc_anyreg(list,OS_16,paraloc^.next^,destloc.register64.reghi,2);
unget_para(paraloc^.next^.next^);
cg.a_load_cgparaloc_anyreg(list,OS_16,paraloc^.next^.next^,GetNextReg(destloc.register64.reglo),2);
unget_para(paraloc^.next^.next^.next^);
cg.a_load_cgparaloc_anyreg(list,OS_16,paraloc^.next^.next^.next^,destloc.register64.reglo,2);
end
else
begin
{ paraloc^ -> low
paraloc^.next^.next -> high }
unget_para(paraloc^);
gen_alloc_regloc(list,destloc);
cg.a_load_cgparaloc_anyreg(list,OS_16,paraloc^,destloc.register64.reglo,2);
unget_para(paraloc^.next^);
cg.a_load_cgparaloc_anyreg(list,OS_16,paraloc^.next^,GetNextReg(destloc.register64.reglo),2);
unget_para(paraloc^.next^.next^);
cg.a_load_cgparaloc_anyreg(list,OS_16,paraloc^.next^.next^,destloc.register64.reghi,2);
unget_para(paraloc^.next^.next^.next^);
cg.a_load_cgparaloc_anyreg(list,OS_16,paraloc^.next^.next^.next^,GetNextReg(destloc.register64.reghi),2);
end;
{$endif defined(cpu16bitalu) or defined(cpu8bitalu)}
2:
if (target_info.endian=ENDIAN_BIG) then
begin
{ paraloc^ -> high
paraloc^.next -> low }
unget_para(paraloc^);
gen_alloc_regloc(list,destloc);
{ reg->reg, alignment is irrelevant }
cg.a_load_cgparaloc_anyreg(list,OS_32,paraloc^,destloc.register64.reghi,4);
unget_para(paraloc^.next^);
cg.a_load_cgparaloc_anyreg(list,OS_32,paraloc^.next^,destloc.register64.reglo,4);
end
else
begin
{ paraloc^ -> low
paraloc^.next -> high }
unget_para(paraloc^);
gen_alloc_regloc(list,destloc);
cg.a_load_cgparaloc_anyreg(list,OS_32,paraloc^,destloc.register64.reglo,4);
unget_para(paraloc^.next^);
cg.a_load_cgparaloc_anyreg(list,OS_32,paraloc^.next^,destloc.register64.reghi,4);
end;
else
{ unexpected number of paralocs }
internalerror(200410104);
end;
end;
LOC_REFERENCE:
begin
gen_alloc_regloc(list,destloc);
reference_reset_base(href,paraloc^.reference.index,paraloc^.reference.offset,para.alignment);
cg64.a_load64_ref_reg(list,href,destloc.register64);
unget_para(paraloc^);
end;
else
internalerror(2005101501);
end
end
else
{$endif cpu64bitalu}
begin
if assigned(paraloc^.next) then
begin
if (destloc.size in [OS_PAIR,OS_SPAIR]) and
(para.Size in [OS_PAIR,OS_SPAIR]) then
begin
unget_para(paraloc^);
gen_alloc_regloc(list,destloc);
cg.a_load_cgparaloc_anyreg(list,OS_INT,paraloc^,destloc.register,sizeof(aint));
unget_para(paraloc^.Next^);
{$if defined(cpu16bitalu) or defined(cpu8bitalu)}
cg.a_load_cgparaloc_anyreg(list,OS_INT,paraloc^.Next^,GetNextReg(destloc.register),sizeof(aint));
{$else}
cg.a_load_cgparaloc_anyreg(list,OS_INT,paraloc^.Next^,destloc.registerhi,sizeof(aint));
{$endif}
end
{$if defined(cpu8bitalu)}
else if (destloc.size in [OS_32,OS_S32]) and
(para.Size in [OS_32,OS_S32]) then
begin
unget_para(paraloc^);
gen_alloc_regloc(list,destloc);
cg.a_load_cgparaloc_anyreg(list,OS_8,paraloc^,destloc.register,sizeof(aint));
unget_para(paraloc^.Next^);
cg.a_load_cgparaloc_anyreg(list,OS_8,paraloc^.Next^,GetNextReg(destloc.register),sizeof(aint));
unget_para(paraloc^.Next^.Next^);
cg.a_load_cgparaloc_anyreg(list,OS_8,paraloc^.Next^.Next^,GetNextReg(GetNextReg(destloc.register)),sizeof(aint));
unget_para(paraloc^.Next^.Next^.Next^);
cg.a_load_cgparaloc_anyreg(list,OS_8,paraloc^.Next^.Next^.Next^,GetNextReg(GetNextReg(GetNextReg(destloc.register))),sizeof(aint));
end
{$endif defined(cpu8bitalu)}
else
begin
{ this can happen if a parameter is spread over
multiple paralocs, e.g. if a record with two single
fields must be passed in two single precision
registers }
{ does it fit in the register of destloc? }
sizeleft:=para.intsize;
if sizeleft<>vardef.size then
internalerror(2014122806);
if sizeleft<>tcgsize2size[destloc.size] then
internalerror(200410105);
{ store everything first to memory, then load it in
destloc }
tg.gettemp(list,sizeleft,sizeleft,tt_persistent,tempref);
gen_alloc_regloc(list,destloc);
while sizeleft>0 do
begin
if not assigned(paraloc) then
internalerror(2014122807);
unget_para(paraloc^);
cg.a_load_cgparaloc_ref(list,paraloc^,tempref,sizeleft,newalignment(para.alignment,para.intsize-sizeleft));
if (paraloc^.size=OS_NO) and
assigned(paraloc^.next) then
internalerror(2014122805);
inc(tempref.offset,tcgsize2size[paraloc^.size]);
dec(sizeleft,tcgsize2size[paraloc^.size]);
paraloc:=paraloc^.next;
end;
dec(tempref.offset,para.intsize);
cg.a_load_ref_reg(list,para.size,para.size,tempref,destloc.register);
tg.ungettemp(list,tempref);
end;
end
else
begin
unget_para(paraloc^);
gen_alloc_regloc(list,destloc);
cg.a_load_cgparaloc_anyreg(list,destloc.size,paraloc^,destloc.register,sizeof(aint));
end;
end;
end;
LOC_FPUREGISTER,
LOC_CFPUREGISTER :
begin
{$ifdef mips}
if (destloc.size = paraloc^.Size) and
(paraloc^.Loc in [LOC_FPUREGISTER,LOC_CFPUREGISTER,LOC_REFERENCE,LOC_CREFERENCE]) then
begin
unget_para(paraloc^);
gen_alloc_regloc(list,destloc);
cg.a_load_cgparaloc_anyreg(list,destloc.size,paraloc^,destloc.register,para.alignment);
end
else if (destloc.size = OS_F32) and
(paraloc^.Loc in [LOC_REGISTER,LOC_CREGISTER]) then
begin
gen_alloc_regloc(list,destloc);
unget_para(paraloc^);
list.Concat(taicpu.op_reg_reg(A_MTC1,paraloc^.register,destloc.register));
end
{ TODO: Produces invalid code, needs fixing together with regalloc setup. }
{
else if (destloc.size = OS_F64) and
(paraloc^.Loc in [LOC_REGISTER,LOC_CREGISTER]) and
(paraloc^.next^.Loc in [LOC_REGISTER,LOC_CREGISTER]) then
begin
gen_alloc_regloc(list,destloc);
tmpreg:=destloc.register;
unget_para(paraloc^);
list.Concat(taicpu.op_reg_reg(A_MTC1,paraloc^.register,tmpreg));
setsupreg(tmpreg,getsupreg(tmpreg)+1);
unget_para(paraloc^.next^);
list.Concat(taicpu.op_reg_reg(A_MTC1,paraloc^.Next^.register,tmpreg));
end
}
else
begin
sizeleft := TCGSize2Size[destloc.size];
tg.GetTemp(list,sizeleft,sizeleft,tt_normal,tempref);
href:=tempref;
while assigned(paraloc) do
begin
unget_para(paraloc^);
cg.a_load_cgparaloc_ref(list,paraloc^,href,sizeleft,destloc.reference.alignment);
inc(href.offset,TCGSize2Size[paraloc^.size]);
dec(sizeleft,TCGSize2Size[paraloc^.size]);
paraloc:=paraloc^.next;
end;
gen_alloc_regloc(list,destloc);
cg.a_loadfpu_ref_reg(list,destloc.size,destloc.size,tempref,destloc.register);
tg.UnGetTemp(list,tempref);
end;
{$else mips}
{$if defined(sparc) or defined(arm)}
{ Arm and Sparc passes floats in int registers, when loading to fpu register
we need a temp }
sizeleft := TCGSize2Size[destloc.size];
tg.GetTemp(list,sizeleft,sizeleft,tt_normal,tempref);
href:=tempref;
while assigned(paraloc) do
begin
unget_para(paraloc^);
cg.a_load_cgparaloc_ref(list,paraloc^,href,sizeleft,destloc.reference.alignment);
inc(href.offset,TCGSize2Size[paraloc^.size]);
dec(sizeleft,TCGSize2Size[paraloc^.size]);
paraloc:=paraloc^.next;
end;
gen_alloc_regloc(list,destloc);
cg.a_loadfpu_ref_reg(list,destloc.size,destloc.size,tempref,destloc.register);
tg.UnGetTemp(list,tempref);
{$else defined(sparc) or defined(arm)}
unget_para(paraloc^);
gen_alloc_regloc(list,destloc);
{ from register to register -> alignment is irrelevant }
cg.a_load_cgparaloc_anyreg(list,destloc.size,paraloc^,destloc.register,0);
if assigned(paraloc^.next) then
internalerror(200410109);
{$endif defined(sparc) or defined(arm)}
{$endif mips}
end;
LOC_MMREGISTER,
LOC_CMMREGISTER :
begin
{$ifndef cpu64bitalu}
{ ARM vfp floats are passed in integer registers }
if (para.size=OS_F64) and
(paraloc^.size in [OS_32,OS_S32]) and
use_vectorfpu(vardef) then
begin
{ we need 2x32bit reg }
if not assigned(paraloc^.next) or
assigned(paraloc^.next^.next) then
internalerror(2009112421);
unget_para(paraloc^.next^);
case paraloc^.next^.loc of
LOC_REGISTER:
tempreg:=paraloc^.next^.register;
LOC_REFERENCE:
begin
tempreg:=cg.getintregister(list,OS_32);
cg.a_load_cgparaloc_anyreg(list,OS_32,paraloc^.next^,tempreg,4);
end;
else
internalerror(2012051301);
end;
{ don't free before the above, because then the getintregister
could reallocate this register and overwrite it }
unget_para(paraloc^);
gen_alloc_regloc(list,destloc);
if (target_info.endian=endian_big) then
{ paraloc^ -> high
paraloc^.next -> low }
reg64:=joinreg64(tempreg,paraloc^.register)
else
reg64:=joinreg64(paraloc^.register,tempreg);
cg64.a_loadmm_intreg64_reg(list,OS_F64,reg64,destloc.register);
end
else
{$endif not cpu64bitalu}
begin
if not assigned(paraloc^.next) then
begin
unget_para(paraloc^);
gen_alloc_regloc(list,destloc);
{ from register to register -> alignment is irrelevant }
cg.a_load_cgparaloc_anyreg(list,destloc.size,paraloc^,destloc.register,0);
end
else
begin
internalerror(200410108);
end;
{ 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;
else
internalerror(2010052903);
end;
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;
var
i : longint;
currpara : tparavarsym;
paraloc : pcgparalocation;
begin
if (po_assembler in current_procinfo.procdef.procoptions) or
{ exceptfilters have a single hidden 'parentfp' parameter, which
is handled by tcg.g_proc_entry. }
(current_procinfo.procdef.proctypeoption=potype_exceptfilter) 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]);
gen_load_cgpara_loc(list,currpara.vardef,currpara.paraloc[calleeside],currpara.initialloc,paramanager.param_use_paraloc(currpara.paraloc[calleeside]));
{ gen_load_cgpara_loc() already allocated the initialloc
-> don't allocate again }
if currpara.initialloc.loc in [LOC_CREGISTER,LOC_CFPUREGISTER,LOC_CMMREGISTER] then
gen_alloc_regvar(list,currpara,false);
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(@hlcg.g_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}
if not(po_assembler in current_procinfo.procdef.procoptions) then
begin
{ initialize refcounted paras, and trash others. Needed here
instead of in gen_initialize_code, because when a reference is
intialised or trashed while the pointer to that reference is kept
in a regvar, we add a register move and that one again has to
come after the parameter loading code as far as the register
allocator is concerned }
current_procinfo.procdef.parast.SymList.ForEachCall(@init_paras,list);
end;
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
{ The condition to use global or local symbol must match
the code written in hlcg.gen_proc_symbol to
avoid change from AB_LOCAL to AB_GLOBAL, which generates
erroneous code (at least for targets using GOT) }
if (cs_profile in current_settings.moduleswitches) or
(po_global in current_procinfo.procdef.procoptions) then
current_asmdata.DefineAsmSymbol(item.str,AB_GLOBAL,AT_FUNCTION)
else
current_asmdata.DefineAsmSymbol(item.str,AB_LOCAL,AT_FUNCTION);
item := TCmdStrListItem(item.next);
end;
end;
procedure gen_proc_entry_code(list:TAsmList);
var
hitemp,
lotemp, stack_frame_size : 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) and
(current_procinfo.tempstart<>tg.lasttemp) 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 }
stack_frame_size := current_procinfo.calc_stackframe_size;
if (stack_frame_size <> 0) and
(po_nostackframe in current_procinfo.procdef.procoptions) then
message1(parser_e_nostackframe_with_locals,tostr(stack_frame_size));
hlcg.g_proc_entry(list,stack_frame_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) then
inc(parasize,sizeof(pint));
end
else
begin
parasize:=current_procinfo.para_stack_size;
{ the parent frame pointer para has to be removed by the caller in
case of Delphi-style parent frame pointer passing }
if not paramanager.use_fixed_stack and
(po_delphi_nested_cc in current_procinfo.procdef.procoptions) then
dec(parasize,sizeof(pint));
end;
{ generate target specific proc exit code }
hlcg.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
paramanager.freecgpara(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;
pd : tprocdef;
begin
pd:=search_system_proc('fpc_stackcheck');
paraloc1.init;
paramanager.getintparaloc(pd,1,paraloc1);
cg.a_load_const_cgpara(list,OS_INT,current_procinfo.calc_stackframe_size,paraloc1);
paramanager.freecgpara(list,paraloc1);
paraloc1.done;
end;
procedure gen_stack_check_call(list:TAsmList);
var
paraloc1 : tcgpara;
pd : tprocdef;
begin
pd:=search_system_proc('fpc_stackcheck');
paraloc1.init;
{ Also alloc the register needed for the parameter }
paramanager.getintparaloc(pd,1,paraloc1);
paramanager.freecgpara(list,paraloc1);
{ Call the helper }
cg.allocallcpuregisters(list);
cg.a_call_name(list,'FPC_STACKCHECK',false);
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_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_registers(list);
end;
{****************************************************************************
External handling
****************************************************************************}
procedure gen_external_stub(list:TAsmList;pd:tprocdef;const externalname:string);
begin
create_hlcodegen;
{ add the procedure to the al_procedures }
maybe_new_object_file(list);
new_section(list,sec_code,lower(pd.mangledname),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));
cg.g_external_wrapper(list,pd,externalname);
destroy_hlcodegen;
end;
{****************************************************************************
Const Data
****************************************************************************}
procedure gen_alloc_symtable(list:TAsmList;pd:tprocdef;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)+
', size='+tcgsize2str(vs.initialloc.size))));
end;
end;
end;
vs.localloc:=vs.initialloc;
FillChar(vs.currentregloc,sizeof(vs.currentregloc),0);
end;
var
i : longint;
highsym,
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 loadnode.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 another 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,true);
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 pd.procoptions) then
tparavarsym(vs).paraloc[calleeside].get_location(vs.initialloc)
{ exception filters receive their frame pointer as a parameter }
else if (pd.proctypeoption=potype_exceptfilter) and
(vo_is_parentfp in vs.varoptions) then
begin
location_reset(vs.initialloc,LOC_REGISTER,OS_ADDR);
vs.initialloc.register:=NR_FRAME_POINTER_REG;
end
else
begin
{ if an open array is used, also its high parameter is used,
since the hidden high parameters are inserted after the corresponding symbols,
we can increase the ref. count here }
if is_open_array(vs.vardef) or is_array_of_const(vs.vardef) then
begin
highsym:=get_high_value_sym(tparavarsym(vs));
if assigned(highsym) then
inc(highsym.refs);
end;
isaddr:=paramanager.push_addr_param(vs.varspez,vs.vardef,pd.proccalloption);
if isaddr then
vs.initialloc.size:=def_cgsize(voidpointertype)
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,tparavarsym(sym).paraloc[calleeside].alignment);
end
else
begin
if isaddr then
tg.GetLocal(list,voidpointertype.size,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 ([po_assembler,po_nostackframe] * pd.procoptions = [po_assembler,po_nostackframe]) and
(vo_is_funcret in vs.varoptions) then
begin
paramanager.create_funcretloc_info(pd,calleeside);
if assigned(pd.funcretloc[calleeside].location^.next) then
begin
{ can't replace references to "result" with a complex
location expression inside assembler code }
location_reset(vs.initialloc,LOC_INVALID,OS_NO);
end
else
pd.funcretloc[calleeside].get_location(vs.initialloc);
end
else if (m_delphi in current_settings.modeswitches) and
(po_assembler in pd.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,true);
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:
{$if defined(cpu64bitalu)}
if location.size in [OS_128,OS_S128] then
begin
rv.intregvars.addnodup(getsupreg(location.register128.reglo));
rv.intregvars.addnodup(getsupreg(location.register128.reghi));
end
else
{$elseif defined(cpu32bitalu)}
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
{$elseif defined(cpu16bitalu)}
if location.size in [OS_64,OS_S64] then
begin
rv.intregvars.addnodup(getsupreg(location.register64.reglo));
rv.intregvars.addnodup(getsupreg(GetNextReg(location.register64.reglo)));
rv.intregvars.addnodup(getsupreg(location.register64.reghi));
rv.intregvars.addnodup(getsupreg(GetNextReg(location.register64.reghi)));
end
else
if location.size in [OS_32,OS_S32] then
begin
rv.intregvars.addnodup(getsupreg(location.register));
rv.intregvars.addnodup(getsupreg(GetNextReg(location.register)));
end
else
{$elseif defined(cpu8bitalu)}
if location.size in [OS_64,OS_S64] then
begin
rv.intregvars.addnodup(getsupreg(location.register64.reglo));
rv.intregvars.addnodup(getsupreg(GetNextReg(location.register64.reglo)));
rv.intregvars.addnodup(getsupreg(GetNextReg(GetNextReg(location.register64.reglo))));
rv.intregvars.addnodup(getsupreg(GetNextReg(GetNextReg(GetNextReg(location.register64.reglo)))));
rv.intregvars.addnodup(getsupreg(location.register64.reghi));
rv.intregvars.addnodup(getsupreg(GetNextReg(location.register64.reghi)));
rv.intregvars.addnodup(getsupreg(GetNextReg(GetNextReg(location.register64.reghi))));
rv.intregvars.addnodup(getsupreg(GetNextReg(GetNextReg(GetNextReg(location.register64.reghi)))));
end
else
if location.size in [OS_32,OS_S32] then
begin
rv.intregvars.addnodup(getsupreg(location.register));
rv.intregvars.addnodup(getsupreg(GetNextReg(location.register)));
rv.intregvars.addnodup(getsupreg(GetNextReg(GetNextReg(location.register))));
rv.intregvars.addnodup(getsupreg(GetNextReg(GetNextReg(GetNextReg(location.register)))));
end
else
if location.size in [OS_16,OS_S16] then
begin
rv.intregvars.addnodup(getsupreg(location.register));
rv.intregvars.addnodup(getsupreg(GetNextReg(location.register)));
end
else
{$endif}
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 (ti_valid in ttemprefnode(n).tempinfo^.flags) 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 cdecl_pocalls) 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;
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 :
if (pi_has_label in current_procinfo.flags) then
{$if defined(cpu64bitalu)}
if def_cgsize(vardef) in [OS_128,OS_S128] then
begin
cg.a_reg_sync(list,localloc.register128.reglo);
cg.a_reg_sync(list,localloc.register128.reghi);
end
else
{$elseif defined(cpu32bitalu)}
if def_cgsize(vardef) in [OS_64,OS_S64] then
begin
cg.a_reg_sync(list,localloc.register64.reglo);
cg.a_reg_sync(list,localloc.register64.reghi);
end
else
{$elseif defined(cpu16bitalu)}
if def_cgsize(vardef) in [OS_64,OS_S64] then
begin
cg.a_reg_sync(list,localloc.register64.reglo);
cg.a_reg_sync(list,GetNextReg(localloc.register64.reglo));
cg.a_reg_sync(list,localloc.register64.reghi);
cg.a_reg_sync(list,GetNextReg(localloc.register64.reghi));
end
else
if def_cgsize(vardef) in [OS_32,OS_S32] then
begin
cg.a_reg_sync(list,localloc.register);
cg.a_reg_sync(list,GetNextReg(localloc.register));
end
else
{$elseif defined(cpu8bitalu)}
if def_cgsize(vardef) in [OS_64,OS_S64] then
begin
cg.a_reg_sync(list,localloc.register64.reglo);
cg.a_reg_sync(list,GetNextReg(localloc.register64.reglo));
cg.a_reg_sync(list,GetNextReg(GetNextReg(localloc.register64.reglo)));
cg.a_reg_sync(list,GetNextReg(GetNextReg(GetNextReg(localloc.register64.reglo))));
cg.a_reg_sync(list,localloc.register64.reghi);
cg.a_reg_sync(list,GetNextReg(localloc.register64.reghi));
cg.a_reg_sync(list,GetNextReg(GetNextReg(localloc.register64.reghi)));
cg.a_reg_sync(list,GetNextReg(GetNextReg(GetNextReg(localloc.register64.reghi))));
end
else
if def_cgsize(vardef) in [OS_32,OS_S32] then
begin
cg.a_reg_sync(list,localloc.register);
cg.a_reg_sync(list,GetNextReg(localloc.register));
cg.a_reg_sync(list,GetNextReg(GetNextReg(localloc.register)));
cg.a_reg_sync(list,GetNextReg(GetNextReg(GetNextReg(localloc.register))));
end
else
if def_cgsize(vardef) in [OS_16,OS_S16] then
begin
cg.a_reg_sync(list,localloc.register);
cg.a_reg_sync(list,GetNextReg(localloc.register));
end
else
{$endif}
cg.a_reg_sync(list,localloc.register);
LOC_CFPUREGISTER,
LOC_CMMREGISTER:
if (pi_has_label 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_load_vmt_register(list:TAsmList;objdef:tobjectdef;selfloc:tlocation;var vmtreg:tregister);
var
href : treference;
selfdef: tdef;
begin
if is_object(objdef) then
begin
case selfloc.loc of
LOC_CREFERENCE,
LOC_REFERENCE:
begin
hlcg.reference_reset_base(href,voidpointertype,hlcg.getaddressregister(list,voidpointertype),objdef.vmt_offset,voidpointertype.size);
hlcg.a_loadaddr_ref_reg(list,voidpointertype,voidpointertype,selfloc.reference,href.base);
selfdef:=getpointerdef(objdef);
end;
else
internalerror(200305056);
end;
end
else
{ This is also valid for Objective-C classes: vmt_offset is 0 there,
and the first "field" of an Objective-C class instance is a pointer
to its "meta-class". }
begin
selfdef:=objdef;
case selfloc.loc of
LOC_REGISTER:
begin
{$ifdef cpu_uses_separate_address_registers}
if getregtype(left.location.register)<>R_ADDRESSREGISTER then
begin
reference_reset_base(href,cg.getaddressregister(list),objdef.vmt_offset,sizeof(pint));
cg.a_load_reg_reg(list,OS_ADDR,OS_ADDR,selfloc.register,href.base);
end
else
{$endif cpu_uses_separate_address_registers}
hlcg.reference_reset_base(href,voidpointertype,selfloc.register,objdef.vmt_offset,voidpointertype.size);
end;
LOC_CONSTANT,
LOC_CREGISTER,
LOC_CREFERENCE,
LOC_REFERENCE,
LOC_CSUBSETREG,
LOC_SUBSETREG,
LOC_CSUBSETREF,
LOC_SUBSETREF:
begin
hlcg.reference_reset_base(href,voidpointertype,hlcg.getaddressregister(list,voidpointertype),objdef.vmt_offset,voidpointertype.size);
{ todo: pass actual vmt pointer type to hlcg }
hlcg.a_load_loc_reg(list,voidpointertype,voidpointertype,selfloc,href.base);
end;
else
internalerror(200305057);
end;
end;
vmtreg:=hlcg.getaddressregister(list,voidpointertype);
hlcg.g_maybe_testself(list,selfdef,href.base);
hlcg.a_load_ref_reg(list,voidpointertype,voidpointertype,href,vmtreg);
{ test validity of VMT }
if not(is_interface(objdef)) and
not(is_cppclass(objdef)) and
not(is_objc_class_or_protocol(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_fpc_dummy(list : TAsmList);
begin
{$ifdef i386}
{ fix me! }
list.concat(Taicpu.Op_const_reg(A_MOV,S_L,1,NR_EAX));
list.concat(Taicpu.Op_const(A_RET,S_W,12));
{$endif i386}
end;
procedure gen_load_frame_for_exceptfilter(list : TAsmList);
var
para: tparavarsym;
begin
para:=tparavarsym(current_procinfo.procdef.paras[0]);
if not (vo_is_parentfp in para.varoptions) then
InternalError(201201142);
if (para.paraloc[calleeside].location^.loc<>LOC_REGISTER) or
(para.paraloc[calleeside].location^.next<>nil) then
InternalError(201201143);
cg.a_load_reg_reg(list,OS_ADDR,OS_ADDR,para.paraloc[calleeside].location^.register,
NR_FRAME_POINTER_REG);
end;
end.
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