freepascal.compiler/compiler/jvm/njvmadd.pas

{
    Copyright (c) 2000-2011 by Florian Klaempfl and Jonas Maebe

    Code generation for add nodes on 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 njvmadd;

{$i fpcdefs.inc}

interface

    uses
       cgbase,
       node,ncgadd,cpubase;

    type

       { tjvmaddnode }

       tjvmaddnode = class(tcgaddnode)
          function pass_1: tnode;override;
       protected
          function first_addstring: tnode; override;

          function cmpnode2signedtopcmp: TOpCmp;

          procedure second_generic_compare;

          procedure pass_left_right;override;
          procedure second_addfloat;override;
          procedure second_cmpfloat;override;
          procedure second_cmpboolean;override;
          procedure second_cmpsmallset;override;
          procedure second_cmp64bit;override;
          procedure second_add64bit; override;
          procedure second_cmpordinal;override;
       end;

  implementation

    uses
      systems,
      cutils,verbose,constexp,
      symconst,symtable,symdef,
      paramgr,procinfo,
      aasmtai,aasmdata,aasmcpu,defutil,
      hlcgobj,hlcgcpu,cgutils,
      cpupara,
      ncon,nset,nadd,ncal,ncnv,
      cgobj;

{*****************************************************************************
                               tjvmaddnode
*****************************************************************************}

    function tjvmaddnode.pass_1: tnode;
      begin
        { special handling for enums: they're classes in the JVM -> get their
          ordinal value to compare them (do before calling inherited pass_1,
          because pass_1 will convert enum constants from ordinals into class
          instances) }
        if (left.resultdef.typ=enumdef) and
           (right.resultdef.typ=enumdef) then
          begin
            { enums can only be compared at this stage (add/sub is only allowed
              in constant expressions) }
            if not is_boolean(resultdef) then
              internalerror(2011062603);
            inserttypeconv_explicit(left,s32inttype);
            inserttypeconv_explicit(right,s32inttype);
          end;
        result:=inherited pass_1;
        if expectloc=LOC_FLAGS then
          expectloc:=LOC_JUMP;
      end;


    function tjvmaddnode.first_addstring: tnode;
      var
        cmpfuncname: string;
      begin
        { when we get here, we are sure that both the left and the right }
        { node are both strings of the same stringtype (JM)              }
        case nodetype of
          addn:
            begin
               if is_shortstring(resultdef) then
                 begin
                   result:=inherited;
                   exit;
                 end;
              { unicode/ansistring operations use functions rather than
                procedures for efficiency reasons (were also implemented before
                var-parameters were supported; may go to procedures for
                maintenance reasons though }
              if (left.nodetype=stringconstn) and (tstringconstnode(left).len=0) then
                begin
                  result:=right;
                  left.free;
                  left:=nil;
                  right:=nil;
                  exit;
                end;
              if (right.nodetype=stringconstn) and (tstringconstnode(right).len=0) then
                begin
                  result:=left;
                  left:=nil;
                  right.free;
                  right:=nil;
                  exit;
                end;

              { create the call to the concat routine both strings as arguments }
              result:=ccallnode.createintern('fpc_'+
                tstringdef(resultdef).stringtypname+'_concat',
                ccallparanode.create(right,
                ccallparanode.create(left,nil)));
              { we reused the arguments }
              left := nil;
              right := nil;
            end;
          ltn,lten,gtn,gten,equaln,unequaln :
            begin
              { call compare routine }
              cmpfuncname := 'fpc_'+tstringdef(left.resultdef).stringtypname+'_compare';
              { for equality checks use optimized version }
              if nodetype in [equaln,unequaln] then
                cmpfuncname := cmpfuncname + '_equal';

              result := ccallnode.createintern(cmpfuncname,
                ccallparanode.create(right,ccallparanode.create(left,nil)));
              { and compare its result with 0 according to the original operator }
              result := caddnode.create(nodetype,result,
                cordconstnode.create(0,s32inttype,false));
              left := nil;
              right := nil;
            end;
          else
            internalerror(2011031401);
        end;
      end;

    function tjvmaddnode.cmpnode2signedtopcmp: TOpCmp;
      begin
        case nodetype of
          gtn: result:=OC_GT;
          gten: result:=OC_GTE;
          ltn: result:=OC_LT;
          lten: result:=OC_LTE;
          equaln: result:=OC_EQ;
          unequaln: result:=OC_NE;
          else
            internalerror(2011010412);
        end;
      end;


    procedure tjvmaddnode.second_generic_compare;
      var
        cmpop: TOpCmp;
      begin
        pass_left_right;
        { swap the operands to make it easier for the optimizer to optimize
          the operand stack slot reloading in case both are in a register }
        if (left.location.loc in [LOC_REGISTER,LOC_CREGISTER]) and
           (right.location.loc in [LOC_REGISTER,LOC_CREGISTER]) then
          swapleftright;
        cmpop:=cmpnode2signedtopcmp;
        if (nf_swapped in flags) then
          cmpop:=swap_opcmp(cmpop);
        location_reset(location,LOC_JUMP,OS_NO);

        if left.location.loc in [LOC_REGISTER,LOC_CREGISTER] then
          hlcg.a_cmp_loc_reg_label(current_asmdata.CurrAsmList,left.resultdef,cmpop,right.location,left.location.register,current_procinfo.CurrTrueLabel)
        else case right.location.loc of
          LOC_REGISTER,LOC_CREGISTER:
            hlcg.a_cmp_reg_loc_label(current_asmdata.CurrAsmList,left.resultdef,cmpop,right.location.register,left.location,current_procinfo.CurrTrueLabel);
          LOC_REFERENCE,LOC_CREFERENCE:
            hlcg.a_cmp_ref_loc_label(current_asmdata.CurrAsmList,left.resultdef,cmpop,right.location.reference,left.location,current_procinfo.CurrTrueLabel);
          LOC_CONSTANT:
            hlcg.a_cmp_const_loc_label(current_asmdata.CurrAsmList,left.resultdef,cmpop,right.location.value,left.location,current_procinfo.CurrTrueLabel);
          else
            internalerror(2011010413);
        end;
        hlcg.a_jmp_always(current_asmdata.CurrAsmList,current_procinfo.CurrFalseLabel);
      end;

    procedure tjvmaddnode.pass_left_right;
      begin
        swapleftright;
        inherited pass_left_right;
      end;


    procedure tjvmaddnode.second_addfloat;
      var
        op : TAsmOp;
        commutative : boolean;
      begin
        pass_left_right;

        location_reset(location,LOC_FPUREGISTER,def_cgsize(resultdef));
        location.register:=hlcg.getfpuregister(current_asmdata.CurrAsmList,resultdef);

        commutative:=false;
        case nodetype of
          addn :
            begin
              if location.size=OS_F64 then
                op:=a_dadd
              else
                op:=a_fadd;
              commutative:=true;
            end;
          muln :
            begin
              if location.size=OS_F64 then
                op:=a_dmul
              else
                op:=a_fmul;
              commutative:=true;
            end;
          subn :
            begin
              if location.size=OS_F64 then
                op:=a_dsub
              else
                op:=a_fsub;
            end;
          slashn :
            begin
              if location.size=OS_F64 then
                op:=a_ddiv
              else
                op:=a_fdiv;
            end;
          else
            internalerror(2011010402);
        end;

        { swap the operands to make it easier for the optimizer to optimize
          the operand stack slot reloading (non-commutative operations must
          always be in the correct order though) }
        if (commutative and
            (left.location.loc in [LOC_FPUREGISTER,LOC_CFPUREGISTER]) and
            (right.location.loc in [LOC_FPUREGISTER,LOC_CFPUREGISTER])) or
           (not commutative and
            (nf_swapped in flags)) then
          swapleftright;

        thlcgjvm(hlcg).a_load_loc_stack(current_asmdata.CurrAsmList,left.resultdef,left.location);
        thlcgjvm(hlcg).a_load_loc_stack(current_asmdata.CurrAsmList,right.resultdef,right.location);

        current_asmdata.CurrAsmList.concat(taicpu.op_none(op));
        thlcgjvm(hlcg).decstack(current_asmdata.CurrAsmList,1+ord(location.size=OS_F64));
        { could be optimized in the future by keeping the results on the stack,
          if we add code to swap the operands when necessary (a_swap for
          singles, store/load/load for doubles since there is no swap for
          2-slot elements -- also adjust expectloc in that case! }
        thlcgjvm(hlcg).a_load_stack_reg(current_asmdata.CurrAsmList,resultdef,location.register);
      end;


    procedure tjvmaddnode.second_cmpfloat;
      var
        op : tasmop;
        cmpop: TOpCmp;
      begin
        pass_left_right;
        { swap the operands to make it easier for the optimizer to optimize
          the operand stack slot reloading in case both are in a register }
        if (left.location.loc in [LOC_FPUREGISTER,LOC_CFPUREGISTER]) and
           (right.location.loc in [LOC_FPUREGISTER,LOC_CFPUREGISTER]) then
          swapleftright;
        cmpop:=cmpnode2signedtopcmp;
        if (nf_swapped in flags) then
          cmpop:=swap_opcmp(cmpop);
        location_reset(location,LOC_JUMP,OS_NO);

        thlcgjvm(hlcg).a_load_loc_stack(current_asmdata.CurrAsmList,left.resultdef,left.location);
        thlcgjvm(hlcg).a_load_loc_stack(current_asmdata.CurrAsmList,right.resultdef,right.location);

        { compares two floating point values and puts 1/0/-1 on stack depending
          on whether value1 >/=/< value2 }
        if left.location.size=OS_F64 then
          { make sure that comparisons with NaNs always return false for </> }
          if nodetype in [ltn,lten] then
            op:=a_dcmpg
          else
            op:=a_dcmpl
        else if nodetype in [ltn,lten] then
          op:=a_fcmpg
        else
          op:=a_fcmpl;
        current_asmdata.CurrAsmList.concat(taicpu.op_none(op));
        thlcgjvm(hlcg).decstack(current_asmdata.CurrAsmList,(1+ord(left.location.size=OS_F64))*2-1);

        current_asmdata.CurrAsmList.concat(taicpu.op_sym(opcmp2if[cmpop],current_procinfo.CurrTrueLabel));
        thlcgjvm(hlcg).decstack(current_asmdata.CurrAsmList,1);
        hlcg.a_jmp_always(current_asmdata.CurrAsmList,current_procinfo.CurrFalseLabel);
      end;


    procedure tjvmaddnode.second_cmpboolean;
      begin
        second_generic_compare;
      end;


    procedure tjvmaddnode.second_cmpsmallset;
      begin
        if (nodetype in [equaln,unequaln]) then
          begin
            second_generic_compare;
            exit;
          end;
        case nodetype of
          lten,gten:
            begin
              pass_left_right;
              If (not(nf_swapped in flags) and
                  (nodetype=lten)) or
                 ((nf_swapped in flags) and
                  (nodetype=gten)) then
                swapleftright;
              location_reset(location,LOC_JUMP,OS_NO);
              // now we have to check whether left >= right:
              // (right and not(left)=0)
              thlcgjvm(hlcg).a_load_loc_stack(current_asmdata.CurrAsmList,left.resultdef,left.location);
              thlcgjvm(hlcg).a_op_reg_stack(current_asmdata.CurrAsmList,OP_NOT,left.resultdef,NR_NO);
              thlcgjvm(hlcg).a_op_loc_stack(current_asmdata.CurrAsmList,OP_AND,right.resultdef,right.location);
              current_asmdata.CurrAsmList.concat(taicpu.op_sym(a_ifeq,current_procinfo.CurrTrueLabel));
              thlcgjvm(hlcg).decstack(current_asmdata.CurrAsmList,1);
              hlcg.a_jmp_always(current_asmdata.CurrAsmList,current_procinfo.CurrFalseLabel);
            end;
          else
            internalerror(2011010414);
        end;
      end;


    procedure tjvmaddnode.second_cmp64bit;
      begin
        second_generic_compare;
      end;


    procedure tjvmaddnode.second_add64bit;
      begin
        second_opordinal;
      end;


    procedure tjvmaddnode.second_cmpordinal;
      begin
        second_generic_compare;
      end;

begin
  caddnode:=tjvmaddnode;
end.