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{
Copyright (c) 1998-2010 by Florian Klaempfl, Jonas Maebe
Calling conventions for the JVM
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,aasmdata,
cpubase,cpuinfo,
symconst,symbase,symsym,symtype,symdef,paramgr,parabase,cgbase,cgutils;
type
{ TJVMParaManager }
TJVMParaManager=class(TParaManager)
function push_high_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;override;
function push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;override;
function push_copyout_param(varspez: tvarspez; def: tdef; calloption: tproccalloption): boolean; override;
function push_size(varspez: tvarspez; def: tdef; calloption: tproccalloption): longint;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 get_funcretloc(p : tabstractprocdef; side: tcallercallee; def: tdef): tcgpara;override;
function param_use_paraloc(const cgpara: tcgpara): boolean; override;
function ret_in_param(def: tdef; calloption: tproccalloption): boolean; override;
function is_stack_paraloc(paraloc: pcgparalocation): boolean;override;
private
procedure create_funcretloc_info(p : tabstractprocdef; side: tcallercallee);
procedure create_paraloc_info_intern(p : tabstractprocdef; side: tcallercallee; paras: tparalist;
var parasize:longint);
end;
implementation
uses
cutils,verbose,systems,
defutil,jvmdef,
aasmcpu,
hlcgobj;
procedure TJVMParaManager.GetIntParaLoc(calloption : tproccalloption; nr : longint;var cgpara : tcgpara);
begin
{ don't know whether it's an actual integer or a pointer (necessary for cgpara.def) }
internalerror(2010121001);
end;
function TJVMParaManager.push_high_param(varspez: tvarspez; def: tdef; calloption: tproccalloption): boolean;
begin
{ we don't need a separate high parameter, since all arrays in Java
have an implicit associated length }
if not is_open_array(def) then
result:=inherited
else
result:=false;
end;
{ true if a parameter is too large to copy and only the address is pushed }
function TJVMParaManager.push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;
begin
result:=
jvmimplicitpointertype(def) or
((def.typ=formaldef) and
not(varspez in [vs_var,vs_out]));
end;
function TJVMParaManager.push_copyout_param(varspez: tvarspez; def: tdef; calloption: tproccalloption): boolean;
begin
{ in principle also for vs_constref, but since we can't have real
references, that won't make a difference }
result:=
(varspez in [vs_var,vs_out,vs_constref]) and
not jvmimplicitpointertype(def);
end;
function TJVMParaManager.push_size(varspez: tvarspez; def: tdef; calloption: tproccalloption): longint;
begin
{ all aggregate types are emulated using indirect pointer types }
if def.typ in [arraydef,recorddef,setdef,stringdef] then
result:=4
else
result:=inherited;
end;
procedure TJVMParaManager.create_funcretloc_info(p : tabstractprocdef; side: tcallercallee);
begin
p.funcretloc[side]:=get_funcretloc(p,side,p.returndef);
end;
function TJVMParaManager.get_funcretloc(p : tabstractprocdef; side: tcallercallee; def: tdef): tcgpara;
var
paraloc : pcgparalocation;
retcgsize : tcgsize;
begin
def:=get_para_push_size(def);
result.init;
result.alignment:=get_para_align(p.proccalloption);
result.def:=def;
{ 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_INT;
result.intsize:=sizeof(pint);
end
else
begin
retcgsize:=def_cgsize(def);
result.intsize:=def.size;
end;
result.size:=retcgsize;
paraloc:=result.add_location;
{ all values are returned on the evaluation stack }
paraloc^.loc:=LOC_REFERENCE;
paraloc^.reference.index:=NR_EVAL_STACK_BASE;
paraloc^.reference.offset:=0;
end;
function TJVMParaManager.param_use_paraloc(const cgpara: tcgpara): boolean;
begin
{ all parameters are copied by the VM to local variable locations }
result:=true;
end;
function TJVMParaManager.ret_in_param(def: tdef; calloption: tproccalloption): boolean;
begin
{ not as efficient as returning in param for jvmimplicitpointertypes,
but in the latter case the routines are harder to use from Java
(especially for arrays), because the caller then manually has to
allocate the instance/array of the right size }
Result:=false;
end;
function TJVMParaManager.is_stack_paraloc(paraloc: pcgparalocation): boolean;
begin
{ all parameters are passed on the evaluation stack }
result:=true;
end;
procedure TJVMParaManager.create_paraloc_info_intern(p : tabstractprocdef; side: tcallercallee;paras:tparalist;
var parasize:longint);
var
paraloc : pcgparalocation;
i : integer;
hp : tparavarsym;
paracgsize : tcgsize;
paraofs : longint;
paradef : tdef;
begin
paraofs:=0;
for i:=0 to paras.count-1 do
begin
hp:=tparavarsym(paras[i]);
if push_copyout_param(hp.varspez,hp.vardef,p.proccalloption) then
begin
{ passed via array reference (instead of creating a new array
type for every single parameter, use java_jlobject) }
paracgsize:=OS_ADDR;
paradef:=java_jlobject;
end
else
begin
paracgsize:=def_cgsize(hp.vardef);
if paracgsize=OS_NO then
paracgsize:=OS_ADDR;
paradef:=hp.vardef;
end;
paradef:=get_para_push_size(paradef);
hp.paraloc[side].reset;
hp.paraloc[side].size:=paracgsize;
hp.paraloc[side].def:=paradef;
hp.paraloc[side].alignment:=std_param_align;
hp.paraloc[side].intsize:=tcgsize2size[paracgsize];
paraloc:=hp.paraloc[side].add_location;
{ All parameters are passed on the evaluation stack, pushed from
left to right (including self, if applicable). At the callee side,
they're available as local variables 0..n-1 (with 64 bit values
taking up two slots) }
paraloc^.loc:=LOC_REFERENCE;;
paraloc^.reference.offset:=paraofs;
case side of
callerside:
begin
paraloc^.loc:=LOC_REFERENCE;
{ we use a fake loc_reference to indicate the stack location;
the offset (set above) will be used by ncal to order the
parameters so they will be pushed in the right order }
paraloc^.reference.index:=NR_EVAL_STACK_BASE;
end;
calleeside:
begin
paraloc^.loc:=LOC_REFERENCE;
paraloc^.reference.index:=NR_STACK_POINTER_REG;
end;
end;
{ 2 slots for 64 bit integers and floats, 1 slot for the rest }
if not(is_64bit(paradef) or
((paradef.typ=floatdef) and
(tfloatdef(paradef).floattype=s64real))) then
inc(paraofs)
else
inc(paraofs,2);
end;
parasize:=paraofs;
end;
function TJVMParaManager.create_paraloc_info(p : tabstractprocdef; side: tcallercallee):longint;
var
parasize : longint;
begin
parasize:=0;
create_paraloc_info_intern(p,side,p.paras,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:=TJVMParaManager.create;
end.
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