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 /*

  * Copyright (c) 2003, 2018, 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.

  *

  */

 #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

 Register InterpreterRuntime::SignatureHandlerGenerator::from() { return r14; }

 Register InterpreterRuntime::SignatureHandlerGenerator::to()   { return rsp; }

 Register InterpreterRuntime::SignatureHandlerGenerator::temp() { return rscratch1; }

 void InterpreterRuntime::SignatureHandlerGenerator::pass_int() {

   const Address src(from(), Interpreter::local_offset_in_bytes(offset()));

 #ifdef _WIN64

   switch (_num_args) {

   case 0:

     __ movl(c_rarg1, src);

     _num_args++;

     break;

   case 1:

     __ movl(c_rarg2, src);

     _num_args++;

     break;

   case 2:

     __ movl(c_rarg3, src);

     _num_args++;

     break;

   default:

     __ movl(rax, src);

     __ movl(Address(to(), _stack_offset), rax);

     _stack_offset += wordSize;

     break;

   }

 #else

   switch (_num_int_args) {

   case 0:

     __ movl(c_rarg1, src);

     _num_int_args++;

     break;

   case 1:

     __ movl(c_rarg2, src);

     _num_int_args++;

     break;

   case 2:

     __ movl(c_rarg3, src);

     _num_int_args++;

     break;

   case 3:

     __ movl(c_rarg4, src);

     _num_int_args++;

     break;

   case 4:

     __ movl(c_rarg5, src);

     _num_int_args++;

     break;

   default:

     __ movl(rax, src);

     __ movl(Address(to(), _stack_offset), rax);

     _stack_offset += wordSize;

     break;

   }

 #endif

 }

 void InterpreterRuntime::SignatureHandlerGenerator::pass_long() {

   const Address src(from(), Interpreter::local_offset_in_bytes(offset() + 1));

 #ifdef _WIN64

   switch (_num_args) {

   case 0:

     __ movptr(c_rarg1, src);

     _num_args++;

     break;

   case 1:

     __ movptr(c_rarg2, src);

     _num_args++;

     break;

   case 2:

     __ movptr(c_rarg3, src);

     _num_args++;

     break;

   case 3:

   default:

     __ movptr(rax, src);

     __ movptr(Address(to(), _stack_offset), rax);

     _stack_offset += wordSize;

     break;

   }

 #else

   switch (_num_int_args) {

   case 0:

     __ movptr(c_rarg1, src);

     _num_int_args++;

     break;

   case 1:

     __ movptr(c_rarg2, src);

     _num_int_args++;

     break;

   case 2:

     __ movptr(c_rarg3, src);

     _num_int_args++;

     break;

   case 3:

     __ movptr(c_rarg4, src);

     _num_int_args++;

     break;

   case 4:

     __ movptr(c_rarg5, src);

     _num_int_args++;

     break;

   default:

     __ movptr(rax, src);

     __ movptr(Address(to(), _stack_offset), rax);

     _stack_offset += wordSize;

     break;

   }

 #endif

 }

 void InterpreterRuntime::SignatureHandlerGenerator::pass_float() {

   const Address src(from(), Interpreter::local_offset_in_bytes(offset()));

 #ifdef _WIN64

   if (_num_args < Argument::n_float_register_parameters_c-1) {

     __ movflt(as_XMMRegister(++_num_args), src);

   } else {

     __ movl(rax, src);

     __ movl(Address(to(), _stack_offset), rax);

     _stack_offset += wordSize;

   }

 #else

   if (_num_fp_args < Argument::n_float_register_parameters_c) {

     __ movflt(as_XMMRegister(_num_fp_args++), src);

   } else {

     __ movl(rax, src);

     __ movl(Address(to(), _stack_offset), rax);

     _stack_offset += wordSize;

   }

 #endif

 }

 void InterpreterRuntime::SignatureHandlerGenerator::pass_double() {

   const Address src(from(), Interpreter::local_offset_in_bytes(offset() + 1));

 #ifdef _WIN64

   if (_num_args < Argument::n_float_register_parameters_c-1) {

     __ movdbl(as_XMMRegister(++_num_args), src);

   } else {

     __ movptr(rax, src);

     __ movptr(Address(to(), _stack_offset), rax);

     _stack_offset += wordSize;

   }

 #else

   if (_num_fp_args < Argument::n_float_register_parameters_c) {

     __ movdbl(as_XMMRegister(_num_fp_args++), src);

   } else {

     __ movptr(rax, src);

     __ movptr(Address(to(), _stack_offset), rax);

     _stack_offset += wordSize;

   }

 #endif

 }

 void InterpreterRuntime::SignatureHandlerGenerator::pass_object() {

   const Address src(from(), Interpreter::local_offset_in_bytes(offset()));

 #ifdef _WIN64

   switch (_num_args) {

   case 0:

     assert(offset() == 0, "argument register 1 can only be (non-null) receiver");

     __ lea(c_rarg1, src);

     _num_args++;

     break;

   case 1:

     __ lea(rax, src);

     __ xorl(c_rarg2, c_rarg2);

     __ cmpptr(src, 0);

     __ cmov(Assembler::notEqual, c_rarg2, rax);

     _num_args++;

     break;

   case 2:

     __ lea(rax, src);

     __ xorl(c_rarg3, c_rarg3);

     __ cmpptr(src, 0);

     __ cmov(Assembler::notEqual, c_rarg3, rax);

     _num_args++;

     break;

   default:

     __ lea(rax, src);

     __ xorl(temp(), temp());

     __ cmpptr(src, 0);

     __ cmov(Assembler::notEqual, temp(), rax);

     __ movptr(Address(to(), _stack_offset), temp());

     _stack_offset += wordSize;

     break;

   }

 #else

   switch (_num_int_args) {

   case 0:

     assert(offset() == 0, "argument register 1 can only be (non-null) receiver");

     __ lea(c_rarg1, src);

     _num_int_args++;

     break;

   case 1:

     __ lea(rax, src);

     __ xorl(c_rarg2, c_rarg2);

     __ cmpptr(src, 0);

     __ cmov(Assembler::notEqual, c_rarg2, rax);

     _num_int_args++;

     break;

   case 2:

     __ lea(rax, src);

     __ xorl(c_rarg3, c_rarg3);

     __ cmpptr(src, 0);

     __ cmov(Assembler::notEqual, c_rarg3, rax);

     _num_int_args++;

     break;

   case 3:

     __ lea(rax, src);

     __ xorl(c_rarg4, c_rarg4);

     __ cmpptr(src, 0);

     __ cmov(Assembler::notEqual, c_rarg4, rax);

     _num_int_args++;

     break;

   case 4:

     __ lea(rax, src);

     __ xorl(c_rarg5, c_rarg5);

     __ cmpptr(src, 0);

     __ cmov(Assembler::notEqual, c_rarg5, rax);

     _num_int_args++;

     break;

   default:

     __ lea(rax, src);

     __ xorl(temp(), temp());

     __ cmpptr(src, 0);

     __ cmov(Assembler::notEqual, temp(), rax);

     __ movptr(Address(to(), _stack_offset), temp());

     _stack_offset += wordSize;

     break;

   }

 #endif

 }

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

   // generate code to handle arguments

   iterate(fingerprint);

   // return result handler

   __ lea(rax, ExternalAddress(Interpreter::result_handler(method()->result_type())));

   __ ret(0);

   __ flush();

 }

 // Implementation of SignatureHandlerLibrary

 void SignatureHandlerLibrary::pd_set_handler(address handler) {}

 #ifdef _WIN64

 class SlowSignatureHandler

   : public NativeSignatureIterator {

  private:

   address   _from;

   intptr_t* _to;

   intptr_t* _reg_args;

   intptr_t* _fp_identifiers;

   unsigned int _num_args;

   virtual void pass_int()

   {

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

     _from -= Interpreter::stackElementSize;

     if (_num_args < Argument::n_int_register_parameters_c-1) {

       *_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_int_register_parameters_c-1) {

       *_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_int_register_parameters_c-1) {

       *_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_c-1) {

       assert((_num_args*2) < BitsPerWord, "_num_args*2 is out of range");

       *_reg_args++ = from_obj;

       *_fp_identifiers |= ((intptr_t)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_c-1) {

       assert((_num_args*2) < BitsPerWord, "_num_args*2 is out of range");

       *_reg_args++ = from_obj;

       *_fp_identifiers |= ((intptr_t)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() ? 4 : 5);

     _fp_identifiers = to - 2;

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

     *(int*) _fp_identifiers = 0;

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

   }

 };

 #else

 class SlowSignatureHandler

   : public NativeSignatureIterator {

  private:

   address   _from;

   intptr_t* _to;

   intptr_t* _int_args;

   intptr_t* _fp_args;

   intptr_t* _fp_identifiers;

   unsigned int _num_int_args;

   unsigned int _num_fp_args;

   virtual void pass_int()

   {

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

     _from -= Interpreter::stackElementSize;

     if (_num_int_args < Argument::n_int_register_parameters_c-1) {

       *_int_args++ = from_obj;

       _num_int_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_int_args < Argument::n_int_register_parameters_c-1) {

       *_int_args++ = from_obj;

       _num_int_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_int_args < Argument::n_int_register_parameters_c-1) {

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

       _num_int_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_fp_args < Argument::n_float_register_parameters_c) {

       *_fp_args++ = from_obj;

       _num_fp_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_fp_args < Argument::n_float_register_parameters_c) {

       *_fp_args++ = from_obj;

       *_fp_identifiers |= (1 << _num_fp_args); // mark as double

       _num_fp_args++;

     } else {

       *_to++ = from_obj;

     }

   }

  public:

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

     : NativeSignatureIterator(method)

   {

     _from = from;

     _to   = to;

     _int_args = to - (method->is_static() ? 14 : 15);

     _fp_args =  to - 9;

     _fp_identifiers = to - 10;

     *(int*) _fp_identifiers = 0;

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

     _num_fp_args = 0;

   }

 };

 #endif

 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 + 1).iterate(UCONST64(-1));

   // return result handler

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

 IRT_END