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 /*

  * Copyright (c) 1997, 2010, 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 "asm/assembler.hpp"

 #include "interpreter/bytecodeHistogram.hpp"

 #include "interpreter/interpreter.hpp"

 #include "interpreter/interpreterGenerator.hpp"

 #include "interpreter/interpreterRuntime.hpp"

 #include "interpreter/templateTable.hpp"

 #include "oops/arrayOop.hpp"

 #include "oops/methodDataOop.hpp"

 #include "oops/methodOop.hpp"

 #include "oops/oop.inline.hpp"

 #include "prims/jvmtiExport.hpp"

 #include "prims/jvmtiThreadState.hpp"

 #include "prims/methodHandles.hpp"

 #include "runtime/arguments.hpp"

 #include "runtime/deoptimization.hpp"

 #include "runtime/frame.inline.hpp"

 #include "runtime/sharedRuntime.hpp"

 #include "runtime/stubRoutines.hpp"

 #include "runtime/synchronizer.hpp"

 #include "runtime/timer.hpp"

 #include "runtime/vframeArray.hpp"

 #include "utilities/debug.hpp"

 #ifdef COMPILER1

 #include "c1/c1_Runtime1.hpp"

 #endif

 #define __ _masm->

 // Initialize the sentinel used to distinguish an interpreter return address.

 const int Interpreter::return_sentinel = 0xfeedbeed;

 //------------------------------------------------------------------------------------------------------------------------

 address AbstractInterpreterGenerator::generate_slow_signature_handler() {

   address entry = __ pc();

   // rbx,: method

   // rcx: temporary

   // rdi: pointer to locals

   // rsp: end of copied parameters area

   __ mov(rcx, rsp);

   __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::slow_signature_handler), rbx, rdi, rcx);

   __ ret(0);

   return entry;

 }

 //

 // Various method entries (that c++ and asm interpreter agree upon)

 //------------------------------------------------------------------------------------------------------------------------

 //

 //

 // Empty method, generate a very fast return.

 address InterpreterGenerator::generate_empty_entry(void) {

   // rbx,: methodOop

   // rcx: receiver (unused)

   // rsi: previous interpreter state (C++ interpreter) must preserve

   // rsi: sender sp must set sp to this value on return

   if (!UseFastEmptyMethods) return NULL;

   address entry_point = __ pc();

   // If we need a safepoint check, generate full interpreter entry.

   Label slow_path;

   ExternalAddress state(SafepointSynchronize::address_of_state());

   __ cmp32(ExternalAddress(SafepointSynchronize::address_of_state()),

            SafepointSynchronize::_not_synchronized);

   __ jcc(Assembler::notEqual, slow_path);

   // do nothing for empty methods (do not even increment invocation counter)

   // Code: _return

   // _return

   // return w/o popping parameters

   __ pop(rax);

   __ mov(rsp, rsi);

   __ jmp(rax);

   __ bind(slow_path);

   (void) generate_normal_entry(false);

   return entry_point;

 }

 address InterpreterGenerator::generate_math_entry(AbstractInterpreter::MethodKind kind) {

   // rbx,: methodOop

   // rcx: scratrch

   // rsi: sender sp

   if (!InlineIntrinsics) return NULL; // Generate a vanilla entry

   address entry_point = __ pc();

   // These don't need a safepoint check because they aren't virtually

   // callable. We won't enter these intrinsics from compiled code.

   // If in the future we added an intrinsic which was virtually callable

   // we'd have to worry about how to safepoint so that this code is used.

   // mathematical functions inlined by compiler

   // (interpreter must provide identical implementation

   // in order to avoid monotonicity bugs when switching

   // from interpreter to compiler in the middle of some

   // computation)

   //

   // stack: [ ret adr ] <-- rsp

   //        [ lo(arg) ]

   //        [ hi(arg) ]

   //

   // Note: For JDK 1.2 StrictMath doesn't exist and Math.sin/cos/sqrt are

   //       native methods. Interpreter::method_kind(...) does a check for

   //       native methods first before checking for intrinsic methods and

   //       thus will never select this entry point. Make sure it is not

   //       called accidentally since the SharedRuntime entry points will

   //       not work for JDK 1.2.

   //

   // We no longer need to check for JDK 1.2 since it's EOL'ed.

   // The following check existed in pre 1.6 implementation,

   //    if (Universe::is_jdk12x_version()) {

   //      __ should_not_reach_here();

   //    }

   // Universe::is_jdk12x_version() always returns false since

   // the JDK version is not yet determined when this method is called.

   // This method is called during interpreter_init() whereas

   // JDK version is only determined when universe2_init() is called.

   // Note: For JDK 1.3 StrictMath exists and Math.sin/cos/sqrt are

   //       java methods.  Interpreter::method_kind(...) will select

   //       this entry point for the corresponding methods in JDK 1.3.

   // get argument

   __ fld_d(Address(rsp, 1*wordSize));

   switch (kind) {

     case Interpreter::java_lang_math_sin :

         __ trigfunc('s');

         break;

     case Interpreter::java_lang_math_cos :

         __ trigfunc('c');

         break;

     case Interpreter::java_lang_math_tan :

         __ trigfunc('t');

         break;

     case Interpreter::java_lang_math_sqrt:

         __ fsqrt();

         break;

     case Interpreter::java_lang_math_abs:

         __ fabs();

         break;

     case Interpreter::java_lang_math_log:

         __ flog();

         // Store to stack to convert 80bit precision back to 64bits

         __ push_fTOS();

         __ pop_fTOS();

         break;

     case Interpreter::java_lang_math_log10:

         __ flog10();

         // Store to stack to convert 80bit precision back to 64bits

         __ push_fTOS();

         __ pop_fTOS();

         break;

     default                              :

         ShouldNotReachHere();

   }

   // return double result in xmm0 for interpreter and compilers.

   if (UseSSE >= 2) {

     __ subptr(rsp, 2*wordSize);

     __ fstp_d(Address(rsp, 0));

     __ movdbl(xmm0, Address(rsp, 0));

     __ addptr(rsp, 2*wordSize);

   }

   // done, result in FPU ST(0) or XMM0

   __ pop(rdi);                               // get return address

   __ mov(rsp, rsi);                          // set sp to sender sp

   __ jmp(rdi);

   return entry_point;

 }

 // Abstract method entry

 // Attempt to execute abstract method. Throw exception

 address InterpreterGenerator::generate_abstract_entry(void) {

   // rbx,: methodOop

   // rcx: receiver (unused)

   // rsi: previous interpreter state (C++ interpreter) must preserve

   // rsi: sender SP

   address entry_point = __ pc();

   // abstract method entry

   //  pop return address, reset last_sp to NULL

   __ empty_expression_stack();

   __ restore_bcp();      // rsi must be correct for exception handler   (was destroyed)

   __ restore_locals();   // make sure locals pointer is correct as well (was destroyed)

   // throw exception

   __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_AbstractMethodError));

   // the call_VM checks for exception, so we should never return here.

   __ should_not_reach_here();

   return entry_point;

 }

 // Method handle invoker

 // Dispatch a method of the form java.dyn.MethodHandles::invoke(...)

 address InterpreterGenerator::generate_method_handle_entry(void) {

   if (!EnableMethodHandles) {

     return generate_abstract_entry();

   }

   address entry_point = MethodHandles::generate_method_handle_interpreter_entry(_masm);

   return entry_point;

 }

 // This method tells the deoptimizer how big an interpreted frame must be:

 int AbstractInterpreter::size_activation(methodOop method,

                                          int tempcount,

                                          int popframe_extra_args,

                                          int moncount,

                                          int callee_param_count,

                                          int callee_locals,

                                          bool is_top_frame) {

   return layout_activation(method,

                            tempcount,

                            popframe_extra_args,

                            moncount,

                            callee_param_count,

                            callee_locals,

                            (frame*) NULL,

                            (frame*) NULL,

                            is_top_frame);

 }

 void Deoptimization::unwind_callee_save_values(frame* f, vframeArray* vframe_array) {

   // This code is sort of the equivalent of C2IAdapter::setup_stack_frame back in

   // the days we had adapter frames. When we deoptimize a situation where a

   // compiled caller calls a compiled caller will have registers it expects

   // to survive the call to the callee. If we deoptimize the callee the only

   // way we can restore these registers is to have the oldest interpreter

   // frame that we create restore these values. That is what this routine

   // will accomplish.

   // At the moment we have modified c2 to not have any callee save registers

   // so this problem does not exist and this routine is just a place holder.

   assert(f->is_interpreted_frame(), "must be interpreted");

 }