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fpc/compiler/mips/cpupara.pas
Jonas Maebe 57bd6d2685 + merged nestedprocvars branch 
+ support for nested procedural variables:
    o activate using {$modeswitch nestedprocvars} (compatible with all
      regular syntax modes, enabled by default for MacPas mode)
    o activating this mode switch changes the way the frame pointer is
      passed to nested routines into the same way that Delphi uses (always
      passed via the stack, and if necessary removed from the stack by
      the caller) -- Todo: possibly also allow using this parameter
      passing convention without enabling nested procvars, maybe even
      by default in Delphi mode, see mantis #9432
    o both global and nested routines can be passed to/assigned to a
      nested procvar (and called via them). Note that converting global
      *procvars* to nested procvars is intentionally not supported, so
      that this functionality can also be implemented via compile-time
      generated trampolines if necessary (e.g. for LLVM or CIL backends
      as long as they don't support the aforementioned parameter passing
      convention)
    o a nested procvar can both be declared using a Mac/ISO Pascal style
      "inline" type declaration as a parameter type, or as a stand-alone
      type (in the latter case, add "is nested" at the end in analogy to
      "of object" for method pointers -- note that using variables of
      such a type is dangerous, because if you call them once the enclosing
      stack frame no longer exists on the stack, the results are
      undefined; this is however allowed for Metaware Pascal compatibility)

git-svn-id: trunk@15694 -
2010-08-02 22:20:36 +00:00

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{
Copyright (c) 1998-2002 by Florian Klaempfl and David Zhang
Calling conventions for the MIPSEL
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 cpupara;
{$i fpcdefs.inc}
interface
uses
globtype,
cclasses,
aasmtai,
cpubase,cpuinfo,
symconst,symbase,symsym,symtype,symdef,paramgr,parabase,cgbase;
type
TMIPSELParaManager=class(TParaManager)
function push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;override;
function get_volatile_registers_int(calloption : tproccalloption):TCpuRegisterSet;override;
function get_volatile_registers_fpu(calloption : tproccalloption):TCpuRegisterSet;override;
{Returns a structure giving the information on the storage of the parameter
(which must be an integer parameter)
@param(nr Parameter number of routine, starting from 1)}
procedure getintparaloc(calloption : tproccalloption; nr : longint;var cgpara : TCGPara);override;
function create_paraloc_info(p : TAbstractProcDef; side: tcallercallee):longint;override;
function create_varargs_paraloc_info(p : TAbstractProcDef; varargspara:tvarargsparalist):longint;override;
function get_funcretloc(p : tabstractprocdef; side: tcallercallee; def: tdef): tcgpara;override;
private
procedure create_funcretloc_info(p : tabstractprocdef; side: tcallercallee);
procedure create_paraloc_info_intern(p : tabstractprocdef; side: tcallercallee; paras: tparalist;
var intparareg,parasize:longint);
end;
implementation
uses
cutils,verbose,systems,
defutil,
cgutils,cgobj;
type
tparasupregs = array[0..5] of tsuperregister;
pparasupregs = ^tparasupregs;
const
paraoutsupregs : tparasupregs = (RS_R4, RS_R5, RS_R6, RS_R7, RS_R8, RS_R9);
parainsupregs : tparasupregs = (RS_R4, RS_R5, RS_R6, RS_R7, RS_R8, RS_R9);
function TMIPSELParaManager.get_volatile_registers_int(calloption : tproccalloption):TCpuRegisterSet;
begin
result:=[RS_R16..RS_R23];
end;
function tMIPSELparamanager.get_volatile_registers_fpu(calloption : tproccalloption):TCpuRegisterSet;
begin
result:=[RS_F0..RS_F31];
end;
procedure TMIPSELParaManager.GetIntParaLoc(calloption : tproccalloption; nr : longint;var cgpara : tcgpara);
var
paraloc : pcgparalocation;
begin
if nr<1 then
InternalError(2002100806);
cgpara.reset;
cgpara.size:=OS_INT;
cgpara.intsize:=tcgsize2size[OS_INT];
cgpara.alignment:=std_param_align;
paraloc:=cgpara.add_location;
with paraloc^ do
begin
{ The six first parameters are passed into registers } {MIPS first four}
dec(nr);
if nr<6 then //MIPSEL nr<6
begin
loc:=LOC_REGISTER;
register:=newreg(R_INTREGISTER,(RS_R4+nr),R_SUBWHOLE);
end
else
begin
{ The other parameters are passed on the stack }
loc:=LOC_REFERENCE;
reference.index:=NR_STACK_POINTER_REG;
reference.offset:=92+(nr-6)*4;
end;
size:=OS_INT;
end;
end;
{ true if a parameter is too large to copy and only the address is pushed }
function tMIPSELparamanager.push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;
begin
result:=false;
{ var,out always require address }
if varspez in [vs_var,vs_out] then
begin
result:=true;
exit;
end;
case def.typ of
recorddef,
arraydef,
variantdef,
formaldef :
push_addr_param:=true;
objectdef :
result:=is_object(def);
stringdef :
result:=(tstringdef(def).stringtype in [st_shortstring,st_longstring]);
procvardef :
result:=not tprocvardef(def).is_addressonly;
setdef :
result:=not(is_smallset(def));
end;
end;
procedure tMIPSELparamanager.create_funcretloc_info(p : tabstractprocdef; side: tcallercallee);
begin
p.funcretloc[side]:=get_funcretloc(p,side,p.returndef);
end;
function tMIPSELparamanager.get_funcretloc(p : tabstractprocdef; side: tcallercallee; def: tdef): tcgpara;
var
paraloc : pcgparalocation;
retcgsize : tcgsize;
begin
result.init;
result.alignment:=get_para_align(p.proccalloption);
{ void has no location }
if is_void(def) then
begin
paraloc:=result.add_location;
result.size:=OS_NO;
result.intsize:=0;
paraloc^.size:=OS_NO;
paraloc^.loc:=LOC_VOID;
exit;
end;
{ Constructors return self instead of a boolean }
if (p.proctypeoption=potype_constructor) then
begin
retcgsize:=OS_ADDR;
result.intsize:=sizeof(pint);
end
else
begin
retcgsize:=def_cgsize(def);
result.intsize:=def.size;
end;
result.size:=retcgsize;
{ Return is passed as var parameter }
if ret_in_param(def,p.proccalloption) then
begin
paraloc:=result.add_location;
paraloc^.loc:=LOC_REFERENCE;
paraloc^.size:=retcgsize;
exit;
end;
paraloc:=result.add_location;
{ Return in FPU register? }
if p.returndef.typ=floatdef then
begin
paraloc^.loc:=LOC_FPUREGISTER;
paraloc^.register:=NR_FPU_RESULT_REG;
if retcgsize=OS_F64 then
setsubreg(paraloc^.register,R_SUBFD);
paraloc^.size:=retcgsize;
end
else
{ Return in register }
begin
{$ifndef cpu64bit}
if retcgsize in [OS_64,OS_S64] then
begin
{ high }
paraloc^.loc:=LOC_REGISTER;
if side=callerside then
paraloc^.register:=NR_FUNCTION_RESULT64_HIGH_REG
else
paraloc^.register:=NR_FUNCTION_RETURN64_HIGH_REG;
paraloc^.size:=OS_32;
{ low }
paraloc:=result.add_location;
paraloc^.loc:=LOC_REGISTER;
if side=callerside then
paraloc^.register:=NR_FUNCTION_RESULT64_LOW_REG
else
paraloc^.register:=NR_FUNCTION_RETURN64_LOW_REG;
paraloc^.size:=OS_32;
end
else
{$endif cpu64bit}
begin
paraloc^.loc:=LOC_REGISTER;
paraloc^.size:=retcgsize;
if side=callerside then
paraloc^.register:=newreg(R_INTREGISTER,RS_FUNCTION_RESULT_REG,cgsize2subreg(R_INTREGISTER,retcgsize))
else
paraloc^.register:=newreg(R_INTREGISTER,RS_FUNCTION_RETURN_REG,cgsize2subreg(R_INTREGISTER,retcgsize));
end;
end
end;
var
param_offset:array[0..20] of ^Aint;
procedure tMIPSELparamanager.create_paraloc_info_intern(p : tabstractprocdef; side: tcallercallee;paras:tparalist;
var intparareg,parasize:longint);
var
paraloc : pcgparalocation;
i : integer;
hp : tparavarsym;
paracgsize : tcgsize;
hparasupregs : pparasupregs;
paralen : longint;
begin
if side=callerside then
hparasupregs:=@paraoutsupregs
else
hparasupregs:=@parainsupregs;
for i:=0 to paras.count-1 do
begin
param_offset[i] := Nil;
hp:=tparavarsym(paras[i]);
{ currently only support C-style array of const,
there should be no location assigned to the vararg array itself }
if (p.proccalloption in [pocall_cdecl,pocall_cppdecl]) and
is_array_of_const(hp.vardef) then
begin
paraloc:=hp.paraloc[side].add_location;
{ hack: the paraloc must be valid, but is not actually used }
paraloc^.loc:=LOC_REGISTER;
paraloc^.register:=NR_R0;
paraloc^.size:=OS_ADDR;
break;
end;
if push_addr_param(hp.varspez,hp.vardef,p.proccalloption) then
paracgsize:=OS_ADDR
else
begin
paracgsize:=def_cgSize(hp.vardef);
if paracgsize=OS_NO then
paracgsize:=OS_ADDR;
end;
hp.paraloc[side].reset;
hp.paraloc[side].size:=paracgsize;
hp.paraloc[side].Alignment:=std_param_align;
paralen:=tcgsize2size[paracgsize];
hp.paraloc[side].intsize:=paralen;
while paralen>0 do
begin
paraloc:=hp.paraloc[side].add_location;
{ Floats are passed in int registers,
We can allocate at maximum 32 bits per register }
if paracgsize in [OS_64,OS_S64,OS_F32,OS_F64] then
paraloc^.size:=OS_32
else
paraloc^.size:=paracgsize;
{ ret in param? }
if vo_is_funcret in hp.varoptions then
begin
paraloc^.loc:=LOC_REFERENCE;
if side=callerside then
begin
paraloc^.reference.index := NR_STACK_POINTER_REG;
paraloc^.reference.offset:=target_info.first_parm_offset{1000}-12 - parasize;
end
else
begin
paraloc^.reference.index := NR_FRAME_POINTER_REG;
paraloc^.reference.offset:=target_info.first_parm_offset{1000}-4 - parasize;
param_offset[i] := @paraloc^.reference.offset;
end;
inc(parasize,align(tcgsize2size[paraloc^.size],sizeof(aint)));
end
{ In case of po_delphi_nested_cc, the parent frame pointer
is always passed on the stack. }
else if (intparareg<=high(tparasupregs)) and
(not(vo_is_parentfp in hp.varoptions) or
not(po_delphi_nested_cc in p.procoptions)) then
begin
paraloc^.loc:=LOC_REGISTER;
paraloc^.register:=newreg(R_INTREGISTER,hparasupregs^[intparareg],R_SUBWHOLE);
inc(intparareg);
end
else
begin
paraloc^.loc:=LOC_REFERENCE;
if side=callerside then
begin
paraloc^.reference.index := {NR_R17;//}NR_STACK_POINTER_REG;
paraloc^.reference.offset:=target_info.first_parm_offset{1000}-12 - parasize;
end
else
begin
paraloc^.reference.index := {NR_R18;//}NR_FRAME_POINTER_REG;
paraloc^.reference.offset:=target_info.first_parm_offset{1000}-4 - parasize;
param_offset[i] := @paraloc^.reference.offset;
end;
{ Parameters are aligned at 4 bytes }
inc(parasize,align(tcgsize2size[paraloc^.size],sizeof(aint)));
end;
dec(paralen,tcgsize2size[paraloc^.size]);
end;
end;
for i:=0 to paras.count-1 do
begin
if (side = calleeside) and (param_offset[i] <> nil) then
param_offset[i]^ := param_offset[i]^ + parasize - 8;
end;
end;
function TMIPSELParaManager.create_varargs_paraloc_info(p : tabstractprocdef; varargspara:tvarargsparalist):longint;
var
intparareg,
parasize : longint;
begin
intparareg:=0;
parasize:=0;
{ calculate the registers for the normal parameters }
create_paraloc_info_intern(p,callerside,p.paras,intparareg,parasize);
{ append the varargs }
create_paraloc_info_intern(p,callerside,varargspara,intparareg,parasize);
result:=parasize;
end;
function tMIPSELparamanager.create_paraloc_info(p : tabstractprocdef; side: tcallercallee):longint;
var
intparareg,
parasize : longint;
begin
intparareg:=0;
parasize:=0;
create_paraloc_info_intern(p,side,p.paras,intparareg,parasize);
{ Create Function result paraloc }
create_funcretloc_info(p,side);
{ We need to return the size allocated on the stack }
result:=parasize;
end;
begin
ParaManager:=TMIPSELParaManager.create;
end.
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