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{
Copyright (c) 2011 by Jonas Maebe
Generate JVM assembler for nodes that handle loads and assignments
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 njvmld;
{$I fpcdefs.inc}
interface
uses
globtype,
aasmdata,
symtype,
cgutils,
node, ncgld, ncgnstld;
type
tjvmloadnode = class(tcgnestloadnode)
protected
function is_copyout_addr_param_load: boolean;
function handle_threadvar_access: tnode; override;
function keep_param_address_in_nested_struct: boolean; override;
public
function is_addr_param_load: boolean; override;
procedure pass_generate_code; override;
end;
tjvmassignmentnode = class(tcgassignmentnode)
protected
function direct_shortstring_assignment: boolean; override;
function maybechangetemp(list: TAsmList; var n: tnode; const newref: treference): boolean;override;
public
function pass_1: tnode; override;
end;
tjvmarrayconstructornode = class(tcgarrayconstructornode)
protected
procedure makearrayref(var ref: treference; eledef: tdef); override;
procedure advancearrayoffset(var ref: treference; elesize: asizeint); override;
procedure wrapmanagedvarrec(var n: tnode);override;
end;
implementation
uses
verbose,globals,
nbas,nld,ncal,ncon,ninl,nmem,ncnv,
symconst,symsym,symdef,symtable,defutil,jvmdef,
paramgr,
pass_1,
cgbase,hlcgobj,cpuinfo;
{ tjvmassignmentnode }
function tjvmassignmentnode.direct_shortstring_assignment: boolean;
begin
if maybe_find_real_class_definition(right.resultdef,false)=java_jlstring then
inserttypeconv_explicit(right,cunicodestringtype);
result:=right.resultdef.typ=stringdef;
end;
function tjvmassignmentnode.maybechangetemp(list: TAsmList; var n: tnode; const newref: treference): boolean;
begin
{ don't do this when compiling for Dalvik, because it can invalidate the
debug information (which Dalvik uses as extra type information) }
if current_settings.cputype<>cpu_dalvik then
result:=inherited
else
result:=false;
end;
function tjvmassignmentnode.pass_1: tnode;
var
block: tblocknode;
tempn: ttempcreatenode;
stat: tstatementnode;
target: tnode;
psym: tsym;
begin
{ intercept writes to string elements, because Java strings are immutable
-> detour via StringBuilder
}
target:=left.actualtargetnode;
if (target.nodetype=vecn) and
(is_wide_or_unicode_string(tvecnode(target).left.resultdef) or
is_ansistring(tvecnode(target).left.resultdef)) then
begin
{ prevent errors in case of an expression such as
word(str[x]):=1234;
}
inserttypeconv_explicit(right,cwidechartype);
result:=ccallnode.createintern('fpc_'+tstringdef(tvecnode(target).left.resultdef).stringtypname+'_setchar',
ccallparanode.create(right,
ccallparanode.create(tvecnode(target).right,
ccallparanode.create(tvecnode(target).left.getcopy,nil))));
result:=cassignmentnode.create(tvecnode(target).left,result);
right:=nil;
tvecnode(target).left:=nil;
tvecnode(target).right:=nil;
exit;
end
else if (target.nodetype=vecn) and
is_shortstring(tvecnode(target).left.resultdef) then
begin
{ prevent errors in case of an expression such as
byte(str[x]):=12;
}
inserttypeconv_explicit(right,cansichartype);
{ call ShortstringClass(@shortstring).setChar(index,char) }
tvecnode(target).left:=caddrnode.create_internal(tvecnode(target).left);
{ avoid useless typecheck when casting to shortstringclass }
include(tvecnode(target).left.flags,nf_typedaddr);
inserttypeconv_explicit(tvecnode(target).left,java_shortstring);
psym:=search_struct_member(tabstractrecorddef(java_shortstring),'SETCHAR');
if not assigned(psym) or
(psym.typ<>procsym) then
internalerror(2011052408);
result:=
ccallnode.create(
ccallparanode.create(right,
ccallparanode.create(tvecnode(target).right,nil)),
tprocsym(psym),psym.owner,tvecnode(target).left,[]);
right:=nil;
tvecnode(target).left:=nil;
tvecnode(target).right:=nil;
exit;
end
else if target.resultdef.typ=formaldef then
begin
if right.resultdef.typ in [orddef,floatdef] then
right:=cinlinenode.create(in_box_x,false,right)
else if jvmimplicitpointertype(right.resultdef) then
begin
{ we have to assign the address of a deep copy of the type to the
object in the formalpara -> create a temp, assign the value to
the temp, then assign the address in the temp to the para }
block:=internalstatements(stat);
tempn:=ctempcreatenode.create_value(right.resultdef,right.resultdef.size,
tt_persistent,false,right);
addstatement(stat,tempn);
right:=caddrnode.create(ctemprefnode.create(tempn));
inserttypeconv_explicit(right,java_jlobject);
addstatement(stat,ctempdeletenode.create_normal_temp(tempn));
addstatement(stat,ctypeconvnode.create_explicit(
caddrnode.create(ctemprefnode.create(tempn)),java_jlobject));
right:=block;
end;
typecheckpass(right);
result:=inherited;
exit;
end
else
result:=inherited;
end;
function tjvmloadnode.is_copyout_addr_param_load: boolean;
begin
result:=
{ passed via array of one element }
((symtable.symtabletype=parasymtable) and
(symtableentry.typ=paravarsym) and
paramanager.push_copyout_param(tparavarsym(symtableentry).varspez,resultdef,tprocdef(symtable.defowner).proccalloption));
end;
function tjvmloadnode.handle_threadvar_access: tnode;
var
vs: tsym;
begin
{ get the variable wrapping the threadvar }
vs:=tsym(symtable.find(symtableentry.name+'$THREADVAR'));
if not assigned(vs) or
(vs.typ<>staticvarsym) then
internalerror(2011082201);
{ get a read/write reference to the threadvar value }
result:=cloadnode.create(vs,vs.owner);
typecheckpass(result);
result:=ccallnode.createinternmethod(result,'GETREADWRITEREFERENCE',nil);
if not(tstaticvarsym(symtableentry).vardef.typ in [orddef,floatdef]) and
not jvmimplicitpointertype(tstaticvarsym(symtableentry).vardef) then
begin
{ in these cases, the threadvar was internally constructed as an
"array of jlobject", while the variable itself is a different kind of
pointer (dynarmic array, class, interface, pointer type). We cannot
typecast an "array of jlobject" to e.g. an "array of array of byte",
even if all elements inside the array are "array of byte" (since the
outer array type is simply different) -> first dereference (= select
the array element) and then typecast to the result type. This works
even on the left-hand side because then we get e.g.
jlobject(threavarinstance.getreadwritereference^):=value;
threavarinstance.getreadwritereference returns a ppointer in these
cases.
}
result:=cderefnode.create(result);
result:=ctypeconvnode.create_explicit(result,resultdef);
end
else
begin
result:=ctypeconvnode.create_explicit(result,getpointerdef(resultdef));
result:=cderefnode.create(result);
end;
end;
function tjvmloadnode.keep_param_address_in_nested_struct: boolean;
begin
{ we don't need an extra load when implicit pointer types are passed as
var/out/constref parameter (since they are already pointers). However,
when transfering them into a nestedfp struct, we do want to transfer the
pointer and not make a deep copy in case they are var/out/constref (since
changes made to the var/out parameter should propagate up) }
result:=
is_addr_param_load or
((symtableentry.typ=paravarsym) and
jvmimplicitpointertype(tparavarsym(symtableentry).vardef) and
(tparavarsym(symtableentry).varspez in [vs_var,vs_constref,vs_out]));
end;
function tjvmloadnode.is_addr_param_load: boolean;
begin
result:=
(inherited is_addr_param_load and
not jvmimplicitpointertype(tparavarsym(symtableentry).vardef) and
(tparavarsym(symtableentry).vardef.typ<>formaldef)) or
is_copyout_addr_param_load;
end;
procedure tjvmloadnode.pass_generate_code;
begin
if is_copyout_addr_param_load then
begin
{ in case of nested access, load address of field in nestedfpstruct }
if assigned(left) then
generate_nested_access(tabstractnormalvarsym(symtableentry));
location_reset_ref(location,LOC_REFERENCE,def_cgsize(resultdef),4);
location.reference.arrayreftype:=art_indexconst;
location.reference.base:=hlcg.getaddressregister(current_asmdata.CurrAsmList,java_jlobject);
location.reference.indexoffset:=0;
{ load the field from the nestedfpstruct, or the parameter location.
In both cases, the result is an array of one element containing the
parameter value }
if assigned(left) then
hlcg.a_load_loc_reg(current_asmdata.CurrAsmList,java_jlobject,java_jlobject,left.location,location.reference.base)
else
hlcg.a_load_loc_reg(current_asmdata.CurrAsmList,java_jlobject,java_jlobject,tparavarsym(symtableentry).localloc,location.reference.base);
end
else if symtableentry.typ=procsym then
{ handled in tjvmcnvnode.first_proc_to_procvar }
internalerror(2011072408)
else
inherited pass_generate_code;
end;
{ tjvmarrayconstructornode }
procedure tjvmarrayconstructornode.makearrayref(var ref: treference; eledef: tdef);
var
basereg: tregister;
begin
{ arrays are implicitly dereferenced }
basereg:=hlcg.getaddressregister(current_asmdata.CurrAsmList,java_jlobject);
hlcg.a_load_ref_reg(current_asmdata.CurrAsmList,java_jlobject,java_jlobject,ref,basereg);
reference_reset_base(ref,basereg,0,1);
ref.arrayreftype:=art_indexconst;
ref.indexoffset:=0;
end;
procedure tjvmarrayconstructornode.advancearrayoffset(var ref: treference; elesize: asizeint);
begin
inc(ref.indexoffset);
end;
procedure tjvmarrayconstructornode.wrapmanagedvarrec(var n: tnode);
var
varrecdef: trecorddef;
block: tblocknode;
stat: tstatementnode;
temp: ttempcreatenode;
begin
varrecdef:=trecorddef(search_system_type('TVARREC').typedef);
block:=internalstatements(stat);
temp:=ctempcreatenode.create(varrecdef,varrecdef.size,tt_persistent,false);
addstatement(stat,temp);
addstatement(stat,
ccallnode.createinternmethod(
ctemprefnode.create(temp),'INIT',ccallparanode.create(n,nil)));
{ note: this will not free the record contents, but just let its reference
on the stack be reused -- which is ok, because the reference will be
stored into the open array parameter }
addstatement(stat,ctempdeletenode.create_normal_temp(temp));
addstatement(stat,ctemprefnode.create(temp));
n:=block;
firstpass(n);
end;
begin
cloadnode:=tjvmloadnode;
cassignmentnode:=tjvmassignmentnode;
carrayconstructornode:=tjvmarrayconstructornode;
end.
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