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 /*

  * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.

  * Copyright (c) 2015, 2016, Loongson Technology. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code 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

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "interpreter/interpreter.hpp"

 #include "interpreter/interpreterRuntime.hpp"

 #include "memory/allocation.inline.hpp"

 #include "memory/universe.inline.hpp"

 #include "oops/method.hpp"

 #include "oops/oop.inline.hpp"

 #include "runtime/handles.inline.hpp"

 #include "runtime/icache.hpp"

 #include "runtime/interfaceSupport.hpp"

 #include "runtime/signature.hpp"

 #define __ _masm->

 // Implementation of SignatureHandlerGenerator

 //#define aoqi_test

 void InterpreterRuntime::SignatureHandlerGenerator::move(int from_offset, int to_offset) {

   __ ld(temp(), from(), Interpreter::local_offset_in_bytes(from_offset));

   __ sd(temp(), to(), to_offset * longSize);

 }

 void InterpreterRuntime::SignatureHandlerGenerator::box(int from_offset, int to_offset) {

 	__ addi(temp(), from(),Interpreter::local_offset_in_bytes(from_offset) );

 	__ lw(AT, from(), Interpreter::local_offset_in_bytes(from_offset) );

 	Label L;

 	__ bne(AT, R0, L);

 	__ delayed()->nop();

 	__ move(temp(), R0);

 	__ bind(L);

 	__ sw(temp(), to(), to_offset * wordSize);

 }

 void InterpreterRuntime::SignatureHandlerGenerator::generate(uint64_t fingerprint) {

   // generate code to handle arguments

   iterate(fingerprint);

   // return result handler

   __ li(V0, AbstractInterpreter::result_handler(method()->result_type()));

   // return

   __ jr(RA);

   __ delayed()->nop();

   __ flush();

 }

 void InterpreterRuntime::SignatureHandlerGenerator::pass_int() {

   Argument jni_arg(jni_offset());	

   __ lw(temp(), from(), Interpreter::local_offset_in_bytes(offset()));

   __ store_int_argument(temp(), jni_arg);

 }

 void InterpreterRuntime::SignatureHandlerGenerator::pass_object() {

   Argument jni_arg(jni_offset());

   Register Rtmp1 = temp();

   // the handle for a receiver will never be null

   bool do_NULL_check = offset() != 0 || is_static();

   __ ld(Rtmp1, from(), Interpreter::local_offset_in_bytes(offset()));

   Label L;

   __ bne(Rtmp1, R0, L);

   __ addu_long(Rtmp1, from(), Interpreter::local_offset_in_bytes(offset()));

   __ move(Rtmp1, R0);	

   __ bind(L);

   __ store_ptr_argument(Rtmp1, jni_arg);

 }

 //the jvm specifies that long type takes 2 stack spaces, so in do_long(), _offset += 2.

 void InterpreterRuntime::SignatureHandlerGenerator::pass_long() {

   Argument jni_arg(jni_offset());

   /*

   __ lw(temp(), from(), Interpreter::local_offset_in_bytes(offset()));

   __ dsll32(temp(), temp(), 0);

   __ lw(AT, from(), Interpreter::local_offset_in_bytes(offset() + 1));

   __ daddu(temp(), temp(), AT);

   __ sd(temp(), to(), jni_offset() * longSize);

   */

   __ ld(temp(), from(), Interpreter::local_offset_in_bytes(offset() + 1));

   //__ store_long_argument(temp(), jni_arg);

   if(jni_arg.is_Register()) {

     __ move(jni_arg.as_Register(), temp());

   } else {

     __ sd(temp(), jni_arg.as_caller_address());

   }

 }

 #if (defined _LP64) || (defined N32)

 void InterpreterRuntime::SignatureHandlerGenerator::pass_float() {

   Argument jni_arg(jni_offset());	

   __ lwc1(F4, from(), Interpreter::local_offset_in_bytes(offset()));

   //	__ sdc1(F4, to(), jni_offset() * longSize);

   __ store_float_argument(F4, jni_arg);

 }

 //the jvm specifies that double type takes 2 stack spaces, so in do_double(), _offset += 2.

 void InterpreterRuntime::SignatureHandlerGenerator::pass_double() {

   Argument jni_arg(jni_offset());	

   __ ldc1(F4, from(), Interpreter::local_offset_in_bytes(offset() + 1));

   __ store_double_argument(F4, jni_arg);

 }

 #endif

 inline Register InterpreterRuntime::SignatureHandlerGenerator::from()       { return LVP; }

 inline Register InterpreterRuntime::SignatureHandlerGenerator::to()         { return SP; }

 inline Register InterpreterRuntime::SignatureHandlerGenerator::temp()       { return RT4; }

 // Implementation of SignatureHandlerLibrary

 void SignatureHandlerLibrary::pd_set_handler(address handler) {}

 class SlowSignatureHandler

 : public NativeSignatureIterator {

   private:

     address   _from;

     intptr_t* _to;

     intptr_t* _reg_args;

     intptr_t* _fp_identifiers;

     unsigned int _num_args;

     //bool _align;

   virtual void pass_int()

   {

     jint from_obj = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));

     _from -= Interpreter::stackElementSize;

     if (_num_args < Argument::n_register_parameters) {

       *_reg_args++ = from_obj;

       _num_args++;

     } else {

       *_to++ = from_obj;

     }

   }

   virtual void pass_long()

   {

     intptr_t from_obj = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));

     _from -= 2 * Interpreter::stackElementSize;

     if (_num_args < Argument::n_register_parameters) {

       *_reg_args++ = from_obj;

       _num_args++;

     } else {

       *_to++ = from_obj;

     }

   }

   virtual void pass_object()

   {

     intptr_t *from_addr = (intptr_t*)(_from + Interpreter::local_offset_in_bytes(0));

     _from -= Interpreter::stackElementSize;

     if (_num_args < Argument::n_register_parameters) {

       *_reg_args++ = (*from_addr == 0) ? NULL : (intptr_t) from_addr;

       _num_args++;

     } else {

       *_to++ = (*from_addr == 0) ? NULL : (intptr_t) from_addr;

     }

   }

   virtual void pass_float()

   {

     jint from_obj = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));

     _from -= Interpreter::stackElementSize;

     if (_num_args < Argument::n_float_register_parameters) {

       *_reg_args++ = from_obj;

       *_fp_identifiers |= (0x01 << (_num_args*2)); // mark as float

       _num_args++;

     } else {

       *_to++ = from_obj;

     }

   }

   virtual void pass_double()

   {

     intptr_t from_obj = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));

     _from -= 2*Interpreter::stackElementSize;

     if (_num_args < Argument::n_float_register_parameters) {

       *_reg_args++ = from_obj;

       *_fp_identifiers |= (0x3 << (_num_args*2)); // mark as double

       _num_args++;

     } else {

       *_to++ = from_obj;

     }

   }

  public:

   SlowSignatureHandler(methodHandle method, address from, intptr_t* to)

     : NativeSignatureIterator(method)

   {

     _from = from;

     _to   = to;

     //_reg_args = to - (method->is_static() ? 8 : 9);

     _reg_args = to - Argument::n_register_parameters + jni_offset() - 1;

     _fp_identifiers = to - 1;

 //    _to = _to + 4;  // Windows reserves stack space for register arguments

     *(int*) _fp_identifiers = 0;

     //_num_args = (method->is_static() ? 1 : 0);

     _num_args = jni_offset();

   }

 };

 IRT_ENTRY(address,

           InterpreterRuntime::slow_signature_handler(JavaThread* thread,

                                                      Method* method,

                                                      intptr_t* from,

                                                      intptr_t* to))

   methodHandle m(thread, (Method*)method);

   assert(m->is_native(), "sanity check");

   // handle arguments

   SlowSignatureHandler(m, (address)from, to).iterate(UCONST64(-1));

   // return result handler

   return Interpreter::result_handler(m->result_type());

 IRT_END