/*

 * Copyright (c) 1997, 2014, 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/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/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

// Generation of Interpreter

//

// The InterpreterGenerator generates the interpreter into Interpreter::_code.

#define __ _masm->

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

int AbstractInterpreter::BasicType_as_index(BasicType type) {

  int i = 0;

  switch (type) {

    case T_BOOLEAN: i = 0; break;

    case T_CHAR   : i = 1; break;

    case T_BYTE   : i = 2; break;

    case T_SHORT  : i = 3; break;

    case T_INT    : i = 4; break;

    case T_LONG   : i = 5; break;

    case T_VOID   : i = 6; break;

    case T_FLOAT  : i = 7; break;

    case T_DOUBLE : i = 8; break;

    case T_OBJECT : i = 9; break;

    case T_ARRAY  : i = 9; break;

    default       : ShouldNotReachHere();

  }

  assert(0 <= i && i < AbstractInterpreter::number_of_result_handlers, "index out of bounds");

  return i;

}

#ifndef _LP64

address AbstractInterpreterGenerator::generate_slow_signature_handler() {

  address entry = __ pc();

  Argument argv(0, true);

  // We are in the jni transition frame. Save the last_java_frame corresponding to the

  // outer interpreter frame

  //

  __ set_last_Java_frame(FP, noreg);

  // make sure the interpreter frame we've pushed has a valid return pc

  __ mov(O7, I7);

  __ mov(Lmethod, G3_scratch);

  __ mov(Llocals, G4_scratch);

  __ save_frame(0);

  __ mov(G2_thread, L7_thread_cache);

  __ add(argv.address_in_frame(), O3);

  __ mov(G2_thread, O0);

  __ mov(G3_scratch, O1);

  __ call(CAST_FROM_FN_PTR(address, InterpreterRuntime::slow_signature_handler), relocInfo::runtime_call_type);

  __ delayed()->mov(G4_scratch, O2);

  __ mov(L7_thread_cache, G2_thread);

  __ reset_last_Java_frame();

  // load the register arguments (the C code packed them as varargs)

  for (Argument ldarg = argv.successor(); ldarg.is_register(); ldarg = ldarg.successor()) {

      __ ld_ptr(ldarg.address_in_frame(), ldarg.as_register());

  }

  __ ret();

  __ delayed()->

     restore(O0, 0, Lscratch);  // caller's Lscratch gets the result handler

  return entry;

}

#else

// LP64 passes floating point arguments in F1, F3, F5, etc. instead of

// O0, O1, O2 etc..

// Doubles are passed in D0, D2, D4

// We store the signature of the first 16 arguments in the first argument

// slot because it will be overwritten prior to calling the native

// function, with the pointer to the JNIEnv.

// If LP64 there can be up to 16 floating point arguments in registers

// or 6 integer registers.

address AbstractInterpreterGenerator::generate_slow_signature_handler() {

  enum {

    non_float  = 0,

    float_sig  = 1,

    double_sig = 2,

    sig_mask   = 3

  };

  address entry = __ pc();

  Argument argv(0, true);

  // We are in the jni transition frame. Save the last_java_frame corresponding to the

  // outer interpreter frame

  //

  __ set_last_Java_frame(FP, noreg);

  // make sure the interpreter frame we've pushed has a valid return pc

  __ mov(O7, I7);

  __ mov(Lmethod, G3_scratch);

  __ mov(Llocals, G4_scratch);

  __ save_frame(0);

  __ mov(G2_thread, L7_thread_cache);

  __ add(argv.address_in_frame(), O3);

  __ mov(G2_thread, O0);

  __ mov(G3_scratch, O1);

  __ call(CAST_FROM_FN_PTR(address, InterpreterRuntime::slow_signature_handler), relocInfo::runtime_call_type);

  __ delayed()->mov(G4_scratch, O2);

  __ mov(L7_thread_cache, G2_thread);

  __ reset_last_Java_frame();

  // load the register arguments (the C code packed them as varargs)

  Address Sig = argv.address_in_frame();        // Argument 0 holds the signature

  __ ld_ptr( Sig, G3_scratch );                   // Get register argument signature word into G3_scratch

  __ mov( G3_scratch, G4_scratch);

  __ srl( G4_scratch, 2, G4_scratch);             // Skip Arg 0

  Label done;

  for (Argument ldarg = argv.successor(); ldarg.is_float_register(); ldarg = ldarg.successor()) {

    Label NonFloatArg;

    Label LoadFloatArg;

    Label LoadDoubleArg;

    Label NextArg;

    Address a = ldarg.address_in_frame();

    __ andcc(G4_scratch, sig_mask, G3_scratch);

    __ br(Assembler::zero, false, Assembler::pt, NonFloatArg);

    __ delayed()->nop();

    __ cmp(G3_scratch, float_sig );

    __ br(Assembler::equal, false, Assembler::pt, LoadFloatArg);

    __ delayed()->nop();

    __ cmp(G3_scratch, double_sig );

    __ br(Assembler::equal, false, Assembler::pt, LoadDoubleArg);

    __ delayed()->nop();

    __ bind(NonFloatArg);

    // There are only 6 integer register arguments!

    if ( ldarg.is_register() )

      __ ld_ptr(ldarg.address_in_frame(), ldarg.as_register());

    else {

    // Optimization, see if there are any more args and get out prior to checking

    // all 16 float registers.  My guess is that this is rare.

    // If is_register is false, then we are done the first six integer args.

      __ br_null_short(G4_scratch, Assembler::pt, done);

    }

    __ ba(NextArg);

    __ delayed()->srl( G4_scratch, 2, G4_scratch );

    __ bind(LoadFloatArg);

    __ ldf( FloatRegisterImpl::S, a, ldarg.as_float_register(), 4);

    __ ba(NextArg);

    __ delayed()->srl( G4_scratch, 2, G4_scratch );

    __ bind(LoadDoubleArg);

    __ ldf( FloatRegisterImpl::D, a, ldarg.as_double_register() );

    __ ba(NextArg);

    __ delayed()->srl( G4_scratch, 2, G4_scratch );

    __ bind(NextArg);

  }

  __ bind(done);

  __ ret();

  __ delayed()->

     restore(O0, 0, Lscratch);  // caller's Lscratch gets the result handler

  return entry;

}

#endif

void InterpreterGenerator::generate_counter_overflow(Label& Lcontinue) {

  // Generate code to initiate compilation on the counter overflow.

  // InterpreterRuntime::frequency_counter_overflow takes two arguments,

  // the first indicates if the counter overflow occurs at a backwards branch (NULL bcp)

  // and the second is only used when the first is true.  We pass zero for both.

  // The call returns the address of the verified entry point for the method or NULL

  // if the compilation did not complete (either went background or bailed out).

  __ set((int)false, O2);

  __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::frequency_counter_overflow), O2, O2, true);

  // returns verified_entry_point or NULL

  // we ignore it in any case

  __ ba_short(Lcontinue);

}

// End of helpers

// Various method entries

// Abstract method entry

// Attempt to execute abstract method. Throw exception

//

address InterpreterGenerator::generate_abstract_entry(void) {

  address entry = __ pc();

  // abstract method entry

  // 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;

}

bool AbstractInterpreter::can_be_compiled(methodHandle m) {

  // No special entry points that preclude compilation

  return true;

}

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");

}

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

// Exceptions