/*

 * Copyright 1997-2008 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 *

 */

#include "incls/_precompiled.incl"

#include "incls/_interpreter_x86_32.cpp.incl"

#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

  if (TaggedStackInterpreter) {

    __ pushl(Address(rsp, 3*wordSize));  // push hi (and note rsp -= wordSize)

    __ pushl(Address(rsp, 2*wordSize));  // push lo

    __ fld_d(Address(rsp, 0));           // get double in ST0

    __ addptr(rsp, 2*wordSize);

  } else {

    __ 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

  // remove return address. Not really needed, since exception handling throws away expression stack

  __ pop(rbx);

  // adjust stack to what a normal return would do

  __ mov(rsp, rsi);

  // 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;

}

// 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");

}