mirror of
https://gitlab.com/freepascal.org/fpc/source.git
synced 2025-07-26 17:05:58 +02:00
2c313e397e
o support for copying value parameters at the callee side if they were
passed by reference in hlcg
o JVM g_concatcopy() implementation for arrays
o moved code to get length of an array from njvminl to hlcgcpu so it can
be reused elsewhere as well
o export array copy helpers from system unit for use when assigning one
array to another
o some generic support for types that are normally not implicit pointers,
but which are for the JVM target (such as normal arrays)
* handle assigning nil to a dynamic array by generating a setlength(x,0)
node instead of by hardcoding a call to fpc_dynarray_clear, so
target-specific code can handle it if required
* hook up gethltemp() for JVM ttgjvm so array temps are properly
allocated
git-svn-id: branches/jvmbackend@18388 -
134 lines
4.3 KiB
ObjectPascal
134 lines
4.3 KiB
ObjectPascal
{
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Copyright (C) 2010 by Jonas Maebe
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This unit handles the temporary variables for the JVM
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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****************************************************************************
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}
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{
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This unit handles the temporary variables for the JVM.
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}
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unit tgcpu;
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{$i fpcdefs.inc}
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interface
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uses
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globtype,
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aasmdata,
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cgutils,
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symtype,tgobj;
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type
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{ ttgjvm }
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ttgjvm = class(ttgobj)
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protected
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function getifspecialtemp(list: TAsmList; def: tdef; forcesize: aint; temptype: ttemptype; out ref: treference): boolean;
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function alloctemp(list: TAsmList; size, alignment: longint; temptype: ttemptype; def: tdef): longint; override;
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public
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procedure setfirsttemp(l : longint); override;
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procedure getlocal(list: TAsmList; size: longint; alignment: shortint; def: tdef; var ref: treference); override;
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procedure gethltemp(list: TAsmList; def: tdef; forcesize: aint; temptype: ttemptype; out ref: treference); override;
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end;
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implementation
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uses
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verbose,
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cgbase,
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symconst,defutil,
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hlcgobj,hlcgcpu,
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symdef;
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{ ttgjvm }
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function ttgjvm.getifspecialtemp(list: TAsmList; def: tdef; forcesize: aint; temptype: ttemptype; out ref: treference): boolean;
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var
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eledef: tdef;
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ndim: longint;
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begin
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result:=false;
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case def.typ of
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arraydef:
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begin
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if not is_dynamic_array(def) then
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begin
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{ allocate an array of the right size }
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gettemp(list,java_jlobject.size,java_jlobject.alignment,temptype,ref);
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ndim:=0;
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eledef:=def;
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repeat
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thlcgjvm(hlcg).a_load_const_stack(list,s32inttype,tarraydef(eledef).elecount,R_INTREGISTER);
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eledef:=tarraydef(eledef).elementdef;
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inc(ndim);
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until (eledef.typ<>arraydef) or
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is_dynamic_array(eledef);
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eledef:=tarraydef(def).elementdef;
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thlcgjvm(hlcg).g_newarray(list,def,ndim);
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thlcgjvm(hlcg).a_load_stack_ref(list,java_jlobject,ref,0);
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result:=true;
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end;
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end;
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end;
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end;
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function ttgjvm.alloctemp(list: TAsmList; size, alignment: longint; temptype: ttemptype; def: tdef): longint;
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begin
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{ the JVM only supports 1 slot (= 4 bytes in FPC) and 2 slot (= 8 bytes in
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FPC) temps on the stack. double and int64 are 2 slots, the rest is one slot.
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There are no problems with reusing the same slot for a value of a different
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type. There are no alignment requirements either. }
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if size<4 then
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size:=4;
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if not(size in [4,8]) then
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internalerror(2010121401);
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{ don't pass on "def", since we don't care if a slot is used again for a
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different type }
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result:=inherited alloctemp(list, size shr 2, 1, temptype, nil);
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end;
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procedure ttgjvm.setfirsttemp(l: longint);
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begin
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firsttemp:=l;
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lasttemp:=l;
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end;
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procedure ttgjvm.getlocal(list: TAsmList; size: longint; alignment: shortint; def: tdef; var ref: treference);
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begin
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if not getifspecialtemp(list,def,size,tt_persistent,ref) then
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inherited;
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end;
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procedure ttgjvm.gethltemp(list: TAsmList; def: tdef; forcesize: aint; temptype: ttemptype; out ref: treference);
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begin
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if not getifspecialtemp(list,def,forcesize,temptype,ref) then
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inherited;
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end;
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begin
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tgobjclass:=ttgjvm;
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end.
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