/usr/share/fpcsrc/2.6.2/compiler/regvars.pas is in fpc-source-2.6.2 2.6.2-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Copyright (c) 1998-2002 by Florian Klaempfl and Jonas Maebe
This unit handles register variable allocation
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 regvars;
{$i fpcdefs.inc}
interface
uses
aasmbase,aasmtai,aasmdata,aasmcpu,
node,
symsym,
cpubase, cgbase, tgobj;
{$ifdef OLDREGVARS}
procedure assign_regvars(p: tnode);
procedure load_regvars(asml: TAsmList; p: tnode);
procedure cleanup_regvars(asml: TAsmList);
procedure store_regvar(asml: TAsmList; reg: tregister);
procedure load_regvar(asml: TAsmList; vsym: tvarsym);
procedure load_regvar_reg(asml: TAsmList; reg: tregister);
procedure load_all_regvars(asml: TAsmList);
procedure free_regvars(list: TAsmList);
{ procedure translate_regvars(list: TAsmList); }
{$endif OLDREGVARS}
{$ifdef i386}
(*
procedure sync_regvars_other(list1, list2: TAsmList; const regvarsloaded1,
regvarsloaded2: regvarother_booleanarray);
procedure sync_regvars_int(list1, list2: TAsmList; const regvarsloaded1,
regvarsloaded2: Tsuperregisterset);
*)
{$endif i386}
implementation
uses
globtype,systems,comphook,
cutils,cclasses,verbose,globals,
psub,
symconst,symbase,symtype,symdef,paramgr,defutil,
cpuinfo,cgobj,procinfo;
{$ifdef OLDREGVARS}
procedure searchregvars(p : tnamedindexitem;arg:pointer);
var
i,j,k : longint;
parasym : boolean;
begin
parasym:=pboolean(arg)^;
if (tsym(p).typ=varsym) and ((tvarsym(p).varregable <> vr_none) or
((tvarsym(p).varspez in [vs_var,vs_const,vs_out,vs_constref]) and
paramanager.push_addr_param(tvarsym(p).varspez,tvarsym(p).vardef,current_procinfo.procdef.proccalloption))) and
not tvarsym(p).vardef.needs_inittable then
begin
j:=tvarsym(p).refs;
{ walk through all momentary register variables }
for i:=1 to maxvarregs do
begin
with pregvarinfo(current_procinfo.procdef.regvarinfo)^ do
if ((regvars[i]=nil) or (j>regvars_refs[i])) and (j>0) then
begin
for k:=maxvarregs-1 downto i do
begin
regvars[k+1]:=regvars[k];
regvars_para[k+1]:=regvars_para[k];
regvars_refs[k+1]:=regvars_refs[k];
end;
{ calc the new refs
tvarsym(p).refs:=j; }
regvars[i]:=tsym(p);
regvars_para[i]:=parasym;
regvars_refs[i]:=j;
break;
end;
end;
end;
end;
procedure searchfpuregvars(p : tnamedindexitem;arg:pointer);
var
i,j,k : longint;
parasym : boolean;
begin
parasym:=pboolean(arg)^;
if (tsym(p).typ=varsym) and (tvarsym(p).varregable <> vr_none) then
begin
j:=tvarsym(p).refs;
{ parameter get a less value }
{ walk through all momentary register variables }
for i:=1 to maxfpuvarregs do
begin
with pregvarinfo(current_procinfo.procdef.regvarinfo)^ do
if ((fpuregvars[i]=nil) or (j>fpuregvars_refs[i])) and (j>0) then
begin
for k:=maxfpuvarregs-1 downto i do
begin
fpuregvars[k+1]:=fpuregvars[k];
fpuregvars_para[k+1]:=fpuregvars_para[k];
fpuregvars_refs[k+1]:=fpuregvars_refs[k];
end;
{ calc the new refs
tvarsym(p).refs:=j; }
fpuregvars[i]:=tsym(p);
fpuregvars_para[i]:=parasym;
fpuregvars_refs[i]:=j;
break;
end;
end;
end;
end;
procedure assign_regvars(p: tnode);
{ register variables }
var
{$ifndef i386}
hp: tparaitem;
{$endif i386}
regvarinfo: pregvarinfo;
i: longint;
parasym : boolean;
siz : tcgsize;
begin
{ max. optimizations }
{ only if no asm is used }
{ and no try statement }
if (cs_opt_regvar in current_settings.optimizerswitches) and
{ we have to store regvars back to memory in this case (the nested }
{ procedures can access the variables of the parent) }
(not current_procinfo.has_nestedprocs) and
not(pi_has_assembler_block in current_procinfo.flags) and
not(pi_uses_exceptions in current_procinfo.flags) then
begin
new(regvarinfo);
fillchar(regvarinfo^,sizeof(regvarinfo^),0);
current_procinfo.procdef.regvarinfo := regvarinfo;
if (p.registersint<maxvarregs) then
begin
parasym:=false;
symtablestack.foreach_static(searchregvars,@parasym);
{ copy parameter into a register ? }
parasym:=true;
symtablestack.next.foreach_static(searchregvars,@parasym);
{ hold needed registers free }
for i:=maxvarregs downto maxvarregs-p.registersint+1 do
begin
regvarinfo^.regvars[i]:=nil;
regvarinfo^.regvars_para[i] := false;
end;
{ now assign register }
for i:=1 to maxvarregs-p.registersint do
begin
if assigned(regvarinfo^.regvars[i]) and
{ currently we assume we can use registers for all }
{ regvars if procedure does no call }
(not(pi_do_call in current_procinfo.flags) or
{ otherwise, demand some (arbitrary) minimum usage }
(tvarsym(regvarinfo^.regvars[i]).refs > 100)) then
begin
{ register is no longer available for }
{ expressions }
{ search the register which is the most }
{ unused }
{ call by reference/const ? }
if paramanager.push_addr_param(tvarsym(regvarinfo^.regvars[i]).varspez,tvarsym(regvarinfo^.regvars[i]).vardef,current_procinfo.procdef.proccalloption) then
siz:=OS_32
else
if (tvarsym(regvarinfo^.regvars[i]).vardef.typ in [orddef,enumdef]) and
(tvarsym(regvarinfo^.regvars[i]).vardef.size=1) then
siz:=OS_8
else
if (tvarsym(regvarinfo^.regvars[i]).vardef.typ in [orddef,enumdef]) and
(tvarsym(regvarinfo^.regvars[i]).vardef.size=2) then
siz:=OS_16
else
siz:=OS_32;
{ allocate a register for this regvar }
tvarsym(regvarinfo^.regvars[i]).localloc.register:=cg.getintregister(current_asmdata.CurrAsmList,siz);
tvarsym(regvarinfo^.regvars[i]).localloc.loc:=LOC_REGISTER;
{ and make sure it can't be freed }
{ rg.makeregvarint(getsupreg(regvarinfo^.regvars[i].localloc.register));}
end
else
begin
regvarinfo^.regvars[i] := nil;
regvarinfo^.regvars_para[i] := false;
end;
end;
end;
if ((p.registersfpu+1)<maxfpuvarregs) then
begin
parasym:=false;
symtablestack.foreach_static(searchfpuregvars,@parasym);
{$ifndef i386}
{ this code should be never enabled because }
{ 1. the caller loads parameters into registers }
{ 2. (later) the CSE loads a parameter into a }
{ register, if necessary }
{ (FK) }
{ copy parameter into a register ? }
parasym:=true;
symtablestack.next.foreach_static(searchregvars,@parasym);
{$endif i386}
{ hold needed registers free }
{ in non leaf procedures we must be very careful }
{ with assigning registers }
{$ifdef i386}
if current_settings.maxfpuregisters=-1 then
begin
if (pi_do_call in current_procinfo.flags) then
begin
for i:=maxfpuvarregs downto 2 do
regvarinfo^.fpuregvars[i]:=nil;
end
else
{$endif i386}
begin
for i:=maxfpuvarregs downto maxfpuvarregs-p.registersfpu do
regvarinfo^.fpuregvars[i]:=nil;
end;
{$ifdef i386}
end
else
begin
for i:=current_settings.maxfpuregisters+1 to maxfpuvarregs do
regvarinfo^.fpuregvars[i]:=nil;
end;
{$endif i386}
{ now assign register }
for i:=1 to maxfpuvarregs do
begin
if assigned(regvarinfo^.fpuregvars[i]) then
begin
{$ifdef i386}
{ reserve place on the FPU stack }
{$error fixme x86 fpuregvars}
{ regvarinfo^.fpuregvars[i].localloc.register:=trgcpu(rg).correct_fpuregister(NR_ST0,i);}
{$else i386}
{$ifdef x86_64}
{$endif x86_64}
begin
tvarsym(regvarinfo^.fpuregvars[i]).localloc.register:=cg.getfpuregister(current_asmdata.CurrAsmList,OS_F64);
tvarsym(regvarinfo^.fpuregvars[i]).localloc.loc:=LOC_FPUREGISTER;
{ rg.makeregvarother(regvarinfo^.fpuregvars[i].localloc.register);}
end;
{$endif i386}
end;
end;
end;
end;
end;
procedure store_regvar(asml: TAsmList; reg: tregister);
var
i: longint;
cgsize : tcgsize;
r : tregister;
hr: treference;
regvarinfo: pregvarinfo;
vsym: tvarsym;
regidx : tregisterindex;
supreg : tsuperregister;
begin
{$ifdef i386}
regvarinfo := pregvarinfo(current_procinfo.procdef.regvarinfo);
if not assigned(regvarinfo) then
exit;
if getregtype(reg)=R_INTREGISTER then
begin
supreg:=getsupreg(reg);
for i := 1 to maxvarregs do
if assigned(regvarinfo^.regvars[i]) and
(getsupreg(tvarsym(regvarinfo^.regvars[i]).localloc.register)=supreg) then
begin
{ TODO: fixme regvar_loaded_int}
(* if supreg in rg.regvar_loaded_int then
begin
vsym := tvarsym(regvarinfo^.regvars[i]);
{ we only have to store the regvar back to memory if it's }
{ possible that it's been modified (JM) }
if not(vsym.varspez in [vs_const,vs_var,vs_out]) then
begin
{ TODO: FIXME Check vsym.localloc for regvars}
// reference_reset_base(hr,current_procinfo.framepointer,vsym.adjusted_address);
cgsize:=def_cgsize(vsym.vardef);
cg.a_load_reg_ref(asml,cgsize,cgsize,vsym.localloc.register,hr);
end;
asml.concat(tai_regalloc.dealloc(vsym.localloc.register));
exclude(rg.regvar_loaded_int,supreg);
end;
*)
break;
end;
end
else
begin
for i := 1 to maxvarregs do
if assigned(regvarinfo^.regvars[i]) then
begin
{ TODO: fixme regvars}
(*
r:=rg.makeregsize(regvarinfo^.regvars[i].localloc.register,OS_INT);
if (r = reg) then
begin
regidx:=findreg_by_number(r);
if rg.regvar_loaded_other[regidx] then
begin
vsym := tvarsym(regvarinfo^.regvars[i]);
{ we only have to store the regvar back to memory if it's }
{ possible that it's been modified (JM) }
if not(vsym.varspez in [vs_const,vs_var,vs_out]) then
begin
{ TODO: FIXME Check vsym.localloc for regvars}
// reference_reset_base(hr,current_procinfo.framepointer,vsym.adjusted_address);
cgsize:=def_cgsize(vsym.vardef);
cg.a_load_reg_ref(asml,cgsize,cgsize,vsym.localloc.register,hr);
end;
asml.concat(tai_regalloc.dealloc(vsym.localloc.register));
rg.regvar_loaded_other[regidx] := false;
end;
break;
end;
*)
end;
end;
{$endif i386}
end;
procedure load_regvar(asml: TAsmList; vsym: tvarsym);
var
hr: treference;
opsize: tcgsize;
r,
reg : tregister;
regidx : tregisterindex;
begin
{$ifndef i386}
exit;
{$endif i386}
reg:=vsym.localloc.register;
{ TODO: fixme regvars}
(*
if getregtype(reg)=R_INTREGISTER then
begin
if not(getsupreg(reg) in rg.regvar_loaded_int) then
begin
asml.concat(tai_regalloc.alloc(reg));
{ TODO: FIXME Check vsym.localloc for regvars}
// reference_reset_base(hr,current_procinfo.framepointer,vsym.adjusted_address);
if paramanager.push_addr_param(vsym.varspez,vsym.vardef,current_procinfo.procdef.proccalloption) then
opsize := OS_ADDR
else
opsize := def_cgsize(vsym.vardef);
cg.a_load_ref_reg(asml,opsize,opsize,hr,reg);
include(rg.regvar_loaded_int,getsupreg(reg));
end;
end
else
begin
r:=rg.makeregsize(reg,OS_INT);
regidx:=findreg_by_number(r);
if not rg.regvar_loaded_other[regidx] then
begin
asml.concat(tai_regalloc.alloc(reg));
{ TODO: FIXME Check vsym.localloc for regvars}
// reference_reset_base(hr,current_procinfo.framepointer,vsym.adjusted_address);
if paramanager.push_addr_param(vsym.varspez,vsym.vardef,current_procinfo.procdef.proccalloption) then
opsize := OS_ADDR
else
opsize := def_cgsize(vsym.vardef);
cg.a_load_ref_reg(asml,opsize,opsize,hr,reg);
rg.regvar_loaded_other[regidx] := true;
end;
end;
*)
end;
procedure load_regvar_reg(asml: TAsmList; reg: tregister);
var
i: longint;
regvarinfo: pregvarinfo;
reg_spare : tregister;
supreg : tsuperregister;
begin
{
regvarinfo := pregvarinfo(current_procinfo.procdef.regvarinfo);
if not assigned(regvarinfo) then
exit;
if getregtype(reg)=R_INTREGISTER then
begin
supreg:=getsupreg(reg);
for i := 1 to maxvarregs do
if assigned(regvarinfo^.regvars[i]) and
(getsupreg(regvarinfo^.regvars[i].localloc.register) = supreg) then
load_regvar(asml,tvarsym(regvarinfo^.regvars[i]))
end
else
begin
reg_spare := cg.makeregsize(reg,OS_INT);
for i := 1 to maxvarregs do
if assigned(regvarinfo^.regvars[i]) and
(cg.makeregsize(regvarinfo^.regvars[i].localloc.register,OS_INT) = reg_spare) then
load_regvar(asml,tvarsym(regvarinfo^.regvars[i]))
end;
}
end;
procedure load_all_regvars(asml: TAsmList);
{
var
i: longint;
regvarinfo: pregvarinfo;
}
begin
{
regvarinfo := pregvarinfo(current_procinfo.procdef.regvarinfo);
if not assigned(regvarinfo) then
exit;
for i := 1 to maxvarregs do
if assigned(regvarinfo^.regvars[i]) then
load_regvar(asml,tvarsym(regvarinfo^.regvars[i]))
}
end;
procedure load_regvars(asml: TAsmList; p: tnode);
var
i: longint;
regvarinfo: pregvarinfo;
begin
if (cs_opt_regvar in current_settings.optimizerswitches) and
not(pi_has_assembler_block in current_procinfo.flags) and
not(pi_uses_exceptions in current_procinfo.flags) then
begin
regvarinfo := pregvarinfo(current_procinfo.procdef.regvarinfo);
{ can happen when inlining assembler procedures (JM) }
if not assigned(regvarinfo) then
exit;
for i:=1 to maxfpuvarregs do
begin
if assigned(regvarinfo^.fpuregvars[i]) then
begin
{$ifdef i386}
{ reserve place on the FPU stack }
{ TODO: fixme fpustack}
(*
regvarinfo^.fpuregvars[i].localloc.register:=trgcpu(rg).correct_fpuregister(NR_ST0,i-1);
*)
asml.concat(Taicpu.op_none(A_FLDZ,S_NO));
{$endif i386}
end;
end;
{$ifdef i386}
if assigned(p) then
if cs_asm_source in current_settings.globalswitches then
asml.insert(tai_comment.Create(strpnew(tostr(p.registersfpu)+
' registers on FPU stack used by temp. expressions')));
{$endif i386}
{
for i:=1 to maxfpuvarregs do
begin
if assigned(regvarinfo^.fpuregvars[i]) then
begin
if cs_asm_source in current_settings.globalswitches then
asml.insert(tai_comment.Create(strpnew(regvarinfo^.fpuregvars[i].name+
' with weight '+tostr(regvarinfo^.fpuregvars[i].refs)+' assigned to register '+
std_regname(regvarinfo^.fpuregvars[i].localloc.register))));
if (status.verbosity and v_debug)=v_debug then
Message3(cg_d_register_weight,std_regname(regvarinfo^.fpuregvars[i].localloc.register),
tostr(regvarinfo^.fpuregvars[i].refs),regvarinfo^.fpuregvars[i].name);
end;
end;
if cs_asm_source in current_settings.globalswitches then
asml.insert(tai_comment.Create(strpnew('Register variable assignment:')));
}
end;
end;
{$ifdef i386}
(*
procedure sync_regvars_other(list1, list2: TAsmList; const regvarsloaded1,
regvarsloaded2: regvarother_booleanarray);
var
counter: tregisterindex;
begin
for counter := low(rg.regvar_loaded_other) to high(rg.regvar_loaded_other) do
begin
rg.regvar_loaded_other[counter] := regvarsloaded1[counter] and
regvarsloaded2[counter];
if regvarsloaded1[counter] xor regvarsloaded2[counter] then
if regvarsloaded1[counter] then
load_regvar_reg(list2,counter)
else
load_regvar_reg(list1,counter);
end;
end;
procedure sync_regvars_int(list1, list2: TAsmList; const regvarsloaded1,
regvarsloaded2: Tsuperregisterset);
var
i : longint;
r : tregister;
begin
for i:=1 to maxvarregs do
begin
r:=newreg(R_INTREGISTER,varregs[i],R_SUBWHOLE);
if (varregs[i] in regvarsloaded1) and
not(varregs[i] in regvarsloaded2) then
load_regvar_reg(list2,r)
else
if (varregs[i] in regvarsloaded2) and
not(varregs[i] in regvarsloaded1) then
load_regvar_reg(list1,r);
end;
end;
*)
{$endif i386}
procedure cleanup_regvars(asml: TAsmList);
var
i: longint;
reg : tregister;
regidx : tregisterindex;
begin
{ can happen when inlining assembler procedures (JM) }
if not assigned(current_procinfo.procdef.regvarinfo) then
exit;
if (cs_opt_regvar in current_settings.optimizerswitches) and
not(pi_has_assembler_block in current_procinfo.flags) and
not(pi_uses_exceptions in current_procinfo.flags) then
with pregvarinfo(current_procinfo.procdef.regvarinfo)^ do
begin
{$ifdef i386}
for i:=1 to maxfpuvarregs do
if assigned(fpuregvars[i]) then
{ ... and clean it up }
asml.concat(Taicpu.op_reg(A_FSTP,S_NO,NR_ST0));
{$endif i386}
(*
for i := 1 to maxvarregs do
begin
if assigned(regvars[i]) then
begin
reg:=regvars[i].localloc.register;
if getregtype(reg)=R_INTREGISTER then
begin
end
else
begin
reg:=cg.makeregsize(reg,OS_INT);
regidx:=findreg_by_number(reg);
{ TODO: fixme regvar dealloc}
{
if (rg.regvar_loaded_other[regidx]) then
asml.concat(tai_regalloc.dealloc(reg));
}
end;
end;
end;
*)
end;
end;
{
Note: this one can't really be "fixed": register colouring happens after
stabs generation. It could still be useful to generate the "var X is
assigned to register Y with weight ZZZ" messages though
procedure translate_regvars(list: TAsmList);
var
i: longint;
r: tregister;
begin
if not assigned(current_procinfo.procdef.regvarinfo) then
exit;
with pregvarinfo(current_procinfo.procdef.regvarinfo)^ do
begin
for i := 1 to maxvarregs do
if assigned(regvars[i]) then
begin
cg.rg[R_INTREGISTER].translate_register(tvarsym(regvars[i]).localloc.register);
r:=tvarsym(regvars[i]).localloc.register;
if cs_asm_source in current_settings.globalswitches then
list.insert(tai_comment.Create(strpnew(tvarsym(regvars[i]).name+
' with weight '+tostr(tvarsym(regvars[i]).refs)+' assigned to register '+
std_regname(r))));
Message3(cg_d_register_weight,std_regname(r),
tostr(tvarsym(regvars[i]).refs),tvarsym(regvars[i]).name);
end;
for i := 1 to maxfpuvarregs do
if assigned(fpuregvars[i]) then
begin
cg.rg[R_FPUREGISTER].translate_register(tvarsym(regvars[i]).localloc.register);
r:=tvarsym(fpuregvars[i]).localloc.register;
if cs_asm_source in current_settings.globalswitches then
list.insert(tai_comment.Create(strpnew(tvarsym(fpuregvars[i]).name+
' with weight '+tostr(tvarsym(fpuregvars[i]).refs)+' assigned to register '+
std_regname(r))));
Message3(cg_d_register_weight,std_regname(r),
tostr(tvarsym(fpuregvars[i]).refs),tvarsym(fpuregvars[i]).name);
end;
end;
end;
}
procedure free_regvars(list: TAsmList);
var
i: longint;
reg: tregister;
size: tcgsize;
begin
if not assigned(current_procinfo.procdef.regvarinfo) then
exit;
with pregvarinfo(current_procinfo.procdef.regvarinfo)^ do
begin
for i := 1 to maxvarregs do
if assigned(regvars[i]) then
begin
reg:=cg.makeregsize(list,tvarsym(regvars[i]).localloc.register,OS_INT);
cg.a_load_reg_reg(list,OS_INT,OS_INT,reg,reg);
end;
for i := 1 to maxfpuvarregs do
if assigned(fpuregvars[i]) then
begin
reg:=tvarsym(fpuregvars[i]).localloc.register;
size:=reg_cgsize(reg);
cg.a_loadfpu_reg_reg(list,size,reg,reg);
end;
end;
end;
{$endif OLDREGVARS}
end.
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