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 /*

  * Copyright (c) 1998, 2012, Oracle and/or its affiliates. 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.

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  */

 #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

 void InterpreterRuntime::SignatureHandlerGenerator::pass_word(int size_of_arg, int offset_in_arg) {

   Argument  jni_arg(jni_offset() + offset_in_arg, false);

   Register     Rtmp = O0;

   __ ld(Llocals, Interpreter::local_offset_in_bytes(offset()), Rtmp);

   __ store_argument(Rtmp, jni_arg);

 }

 void InterpreterRuntime::SignatureHandlerGenerator::pass_long() {

   Argument  jni_arg(jni_offset(), false);

   Register  Rtmp = O0;

 #ifdef _LP64

   __ ldx(Llocals, Interpreter::local_offset_in_bytes(offset() + 1), Rtmp);

   __ store_long_argument(Rtmp, jni_arg);

 #else

   __ ld(Llocals, Interpreter::local_offset_in_bytes(offset() + 1), Rtmp);

   __ store_argument(Rtmp, jni_arg);

   __ ld(Llocals, Interpreter::local_offset_in_bytes(offset() + 0), Rtmp);

   Argument successor(jni_arg.successor());

   __ store_argument(Rtmp, successor);

 #endif

 }

 void InterpreterRuntime::SignatureHandlerGenerator::pass_float() {

   Argument  jni_arg(jni_offset(), false);

 #ifdef _LP64

   FloatRegister  Rtmp = F0;

   __ ldf(FloatRegisterImpl::S, Llocals, Interpreter::local_offset_in_bytes(offset()), Rtmp);

   __ store_float_argument(Rtmp, jni_arg);

 #else

   Register     Rtmp = O0;

   __ ld(Llocals, Interpreter::local_offset_in_bytes(offset()), Rtmp);

   __ store_argument(Rtmp, jni_arg);

 #endif

 }

 void InterpreterRuntime::SignatureHandlerGenerator::pass_double() {

   Argument  jni_arg(jni_offset(), false);

 #ifdef _LP64

   FloatRegister  Rtmp = F0;

   __ ldf(FloatRegisterImpl::D, Llocals, Interpreter::local_offset_in_bytes(offset() + 1), Rtmp);

   __ store_double_argument(Rtmp, jni_arg);

 #else

   Register  Rtmp = O0;

   __ ld(Llocals, Interpreter::local_offset_in_bytes(offset() + 1), Rtmp);

   __ store_argument(Rtmp, jni_arg);

   __ ld(Llocals, Interpreter::local_offset_in_bytes(offset()), Rtmp);

   Argument successor(jni_arg.successor());

   __ store_argument(Rtmp, successor);

 #endif

 }

 void InterpreterRuntime::SignatureHandlerGenerator::pass_object() {

   Argument  jni_arg(jni_offset(), false);

   Argument java_arg(    offset(), true);

   Register    Rtmp1 = O0;

   Register    Rtmp2 =  jni_arg.is_register() ?  jni_arg.as_register() : O0;

   Register    Rtmp3 =  G3_scratch;

   // the handle for a receiver will never be null

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

   Address     h_arg = Address(Llocals, Interpreter::local_offset_in_bytes(offset()));

   __ ld_ptr(h_arg, Rtmp1);

   if (!do_NULL_check) {

     __ add(h_arg.base(), h_arg.disp(), Rtmp2);

   } else {

     if (Rtmp1 == Rtmp2)

           __ tst(Rtmp1);

     else  __ addcc(G0, Rtmp1, Rtmp2); // optimize mov/test pair

     Label L;

     __ brx(Assembler::notZero, true, Assembler::pt, L);

     __ delayed()->add(h_arg.base(), h_arg.disp(), Rtmp2);

     __ bind(L);

   }

   __ store_ptr_argument(Rtmp2, jni_arg);    // this is often a no-op

 }

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

   // generate code to handle arguments

   iterate(fingerprint);

   // return result handler

   AddressLiteral result_handler(Interpreter::result_handler(method()->result_type()));

   __ sethi(result_handler, Lscratch);

   __ retl();

   __ delayed()->add(Lscratch, result_handler.low10(), Lscratch);

   __ flush();

 }

 // Implementation of SignatureHandlerLibrary

 void SignatureHandlerLibrary::pd_set_handler(address handler) {}

 class SlowSignatureHandler: public NativeSignatureIterator {

  private:

   address   _from;

   intptr_t* _to;

   intptr_t* _RegArgSignature;                   // Signature of first Arguments to be passed in Registers

   uint      _argcount;

   enum {                                        // We need to differenciate float from non floats in reg args

     non_float  = 0,

     float_sig  = 1,

     double_sig = 2,

     long_sig   = 3

   };

   virtual void pass_int() {

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

     _from -= Interpreter::stackElementSize;

     add_signature( non_float );

   }

   virtual void pass_object() {

     // pass address of from

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

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

     _from -= Interpreter::stackElementSize;

     add_signature( non_float );

    }

 #ifdef _LP64

   virtual void pass_float()  {

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

     _from -= Interpreter::stackElementSize;

     add_signature( float_sig );

    }

   virtual void pass_double() {

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

     _from -= 2*Interpreter::stackElementSize;

    add_signature( double_sig );

    }

   virtual void pass_long() {

     _to[0] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));

     _to += 1;

     _from -= 2*Interpreter::stackElementSize;

     add_signature( long_sig );

   }

 #else

    // pass_double() is pass_long() and pass_float() only _LP64

   virtual void pass_long() {

     _to[0] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));

     _to[1] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(0));

     _to += 2;

     _from -= 2*Interpreter::stackElementSize;

     add_signature( non_float );

   }

   virtual void pass_float() {

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

     _from -= Interpreter::stackElementSize;

     add_signature( non_float );

   }

 #endif // _LP64

   virtual void add_signature( intptr_t sig_type ) {

     if ( _argcount < (sizeof (intptr_t))*4 ) {

       *_RegArgSignature |= (sig_type << (_argcount*2) );

       _argcount++;

     }

   }

  public:

   SlowSignatureHandler(methodHandle method, address from, intptr_t* to, intptr_t *RegArgSig) : NativeSignatureIterator(method) {

     _from = from;

     _to   = to;

     _RegArgSignature = RegArgSig;

     *_RegArgSignature = 0;

     _argcount = method->is_static() ? 2 : 1;

   }

 };

 IRT_ENTRY(address, InterpreterRuntime::slow_signature_handler(

                                                     JavaThread* thread,

                                                     Method* method,

                                                     intptr_t* from,

                                                     intptr_t* to ))

   methodHandle m(thread, method);

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

   // handle arguments

   // Warning: We use reg arg slot 00 temporarily to return the RegArgSignature

   // back to the code that pops the arguments into the CPU registers

   SlowSignatureHandler(m, (address)from, m->is_static() ? to+2 : to+1, to).iterate(UCONST64(-1));

   // return result handler

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

 IRT_END