/*

 * Copyright (c) 2014, Red Hat 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 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/macroAssembler.hpp"

#include "interpreter/bytecodeHistogram.hpp"

#include "interpreter/interpreter.hpp"

#include "interpreter/interpreterGenerator.hpp"

#include "interpreter/interpreterRuntime.hpp"

#include "interpreter/interp_masm.hpp"

#include "interpreter/templateTable.hpp"

#include "oops/arrayOop.hpp"

#include "oops/methodData.hpp"

#include "oops/method.hpp"

#include "oops/oop.inline.hpp"

#include "prims/jvmtiExport.hpp"

#include "prims/jvmtiThreadState.hpp"

#include "prims/methodHandles.hpp"

#include "runtime/arguments.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->

address AbstractInterpreterGenerator::generate_slow_signature_handler() {

  address entry = __ pc();

  __ andr(esp, esp, -16);

  __ mov(c_rarg3, esp);

  // rmethod

  // rlocals

  // c_rarg3: first stack arg - wordSize

  // adjust sp

  __ sub(sp, c_rarg3, 18 * wordSize);

  __ str(lr, Address(__ pre(sp, -2 * wordSize)));

  __ call_VM(noreg,

             CAST_FROM_FN_PTR(address,

                              InterpreterRuntime::slow_signature_handler),

             rmethod, rlocals, c_rarg3);

  // r0: result handler

  // Stack layout:

  // rsp: return address           <- sp

  //      1 garbage

  //      8 integer args (if static first is unused)

  //      1 float/double identifiers

  //      8 double args

  //        stack args              <- esp

  //        garbage

  //        expression stack bottom

  //        bcp (NULL)

  //        ...

  // Restore LR

  __ ldr(lr, Address(__ post(sp, 2 * wordSize)));

  // Do FP first so we can use c_rarg3 as temp

  __ ldrw(c_rarg3, Address(sp, 9 * wordSize)); // float/double identifiers

  for (int i = 0; i < Argument::n_float_register_parameters_c; i++) {

    const FloatRegister r = as_FloatRegister(i);

    Label d, done;

    __ tbnz(c_rarg3, i, d);

    __ ldrs(r, Address(sp, (10 + i) * wordSize));

    __ b(done);

    __ bind(d);

    __ ldrd(r, Address(sp, (10 + i) * wordSize));

    __ bind(done);

  }

  // c_rarg0 contains the result from the call of

  // InterpreterRuntime::slow_signature_handler so we don't touch it

  // here.  It will be loaded with the JNIEnv* later.

  __ ldr(c_rarg1, Address(sp, 1 * wordSize));

  for (int i = c_rarg2->encoding(); i <= c_rarg7->encoding(); i += 2) {

    Register rm = as_Register(i), rn = as_Register(i+1);

    __ ldp(rm, rn, Address(sp, i * wordSize));

  }

  __ add(sp, sp, 18 * wordSize);

  __ ret(lr);

  return entry;

}

//

// Various method entries

//

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

  // rmethod: Method*

  // r13: sender sp

  // esp: args

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

  // 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:

  //        [ arg ] <-- esp

  //        [ arg ]

  // retaddr in lr

  address entry_point = NULL;

  Register continuation = lr;

  switch (kind) {

  case Interpreter::java_lang_math_abs:

    entry_point = __ pc();

    __ ldrd(v0, Address(esp));

    __ fabsd(v0, v0);

    __ mov(sp, r13); // Restore caller's SP

    break;

  case Interpreter::java_lang_math_sqrt:

    entry_point = __ pc();

    __ ldrd(v0, Address(esp));

    __ fsqrtd(v0, v0);

    __ mov(sp, r13);

    break;

  case Interpreter::java_lang_math_sin :

  case Interpreter::java_lang_math_cos :

  case Interpreter::java_lang_math_tan :

  case Interpreter::java_lang_math_log :

  case Interpreter::java_lang_math_log10 :

  case Interpreter::java_lang_math_exp :

    entry_point = __ pc();

    __ ldrd(v0, Address(esp));

    __ mov(sp, r13);

    __ mov(r19, lr);

    continuation = r19;  // The first callee-saved register

    generate_transcendental_entry(kind, 1);

    break;

  case Interpreter::java_lang_math_pow :

    entry_point = __ pc();

    __ mov(r19, lr);

    continuation = r19;

    __ ldrd(v0, Address(esp, 2 * Interpreter::stackElementSize));

    __ ldrd(v1, Address(esp));

    __ mov(sp, r13);

    generate_transcendental_entry(kind, 2);

    break;

  default:

    ;

  }

  if (entry_point) {

    __ br(continuation);

  }

  return entry_point;

}

  // double trigonometrics and transcendentals

  // static jdouble dsin(jdouble x);

  // static jdouble dcos(jdouble x);

  // static jdouble dtan(jdouble x);

  // static jdouble dlog(jdouble x);

  // static jdouble dlog10(jdouble x);

  // static jdouble dexp(jdouble x);

  // static jdouble dpow(jdouble x, jdouble y);

void InterpreterGenerator::generate_transcendental_entry(AbstractInterpreter::MethodKind kind, int fpargs) {

  address fn;

  switch (kind) {

  case Interpreter::java_lang_math_sin :

    fn = CAST_FROM_FN_PTR(address, SharedRuntime::dsin);

    break;

  case Interpreter::java_lang_math_cos :

    fn = CAST_FROM_FN_PTR(address, SharedRuntime::dcos);

    break;

  case Interpreter::java_lang_math_tan :

    fn = CAST_FROM_FN_PTR(address, SharedRuntime::dtan);

    break;

  case Interpreter::java_lang_math_log :

    fn = CAST_FROM_FN_PTR(address, SharedRuntime::dlog);

    break;

  case Interpreter::java_lang_math_log10 :

    fn = CAST_FROM_FN_PTR(address, SharedRuntime::dlog10);

    break;

  case Interpreter::java_lang_math_exp :

    fn = CAST_FROM_FN_PTR(address, SharedRuntime::dexp);

    break;

  case Interpreter::java_lang_math_pow :

    fpargs = 2;

    fn = CAST_FROM_FN_PTR(address, SharedRuntime::dpow);

    break;

  default:

    ShouldNotReachHere();

  }

  const int gpargs = 0, rtype = 3;

  __ mov(rscratch1, fn);

  __ blrt(rscratch1, gpargs, fpargs, rtype);

}

// Abstract method entry

// Attempt to execute abstract method. Throw exception

address InterpreterGenerator::generate_abstract_entry(void) {

  // rmethod: Method*

  // r13: sender SP

  address entry_point = __ pc();

  // abstract method entry

  //  pop return address, reset last_sp to NULL

  __ empty_expression_stack();

  __ restore_bcp();      // bcp 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;

}