/*

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

#include "memory/resourceArea.hpp"

#include "oops/access.inline.hpp"

#include "oops/oop.inline.hpp"

#include "runtime/interfaceSupport.inline.hpp"

#include "runtime/timerTrace.hpp"

#include "runtime/sharedRuntime.hpp"

#include "runtime/stubRoutines.hpp"

#include "utilities/align.hpp"

#include "utilities/copy.hpp"

#include "utilities/vmError.hpp"

#ifdef COMPILER2

#include "opto/runtime.hpp"

#endif

// Implementation of StubRoutines - for a description

// of how to extend it, see the header file.

// Class Variables

BufferBlob* StubRoutines::_code1                                = NULL;

BufferBlob* StubRoutines::_code2                                = NULL;

address StubRoutines::_call_stub_return_address                 = NULL;

address StubRoutines::_call_stub_entry                          = NULL;

address StubRoutines::_catch_exception_entry                    = NULL;

address StubRoutines::_forward_exception_entry                  = NULL;

address StubRoutines::_throw_AbstractMethodError_entry          = NULL;

address StubRoutines::_throw_IncompatibleClassChangeError_entry = NULL;

address StubRoutines::_throw_NullPointerException_at_call_entry = NULL;

address StubRoutines::_throw_StackOverflowError_entry           = NULL;

address StubRoutines::_throw_delayed_StackOverflowError_entry   = NULL;

jint    StubRoutines::_verify_oop_count                         = 0;

address StubRoutines::_verify_oop_subroutine_entry              = NULL;

address StubRoutines::_atomic_xchg_entry                        = NULL;

address StubRoutines::_atomic_xchg_long_entry                   = NULL;

address StubRoutines::_atomic_store_entry                       = NULL;

address StubRoutines::_atomic_cmpxchg_entry                     = NULL;

address StubRoutines::_atomic_cmpxchg_byte_entry                = NULL;

address StubRoutines::_atomic_cmpxchg_long_entry                = NULL;

address StubRoutines::_atomic_add_entry                         = NULL;

address StubRoutines::_atomic_add_long_entry                    = NULL;

address StubRoutines::_fence_entry                              = NULL;

address StubRoutines::_d2i_wrapper                              = NULL;

address StubRoutines::_d2l_wrapper                              = NULL;

jint    StubRoutines::_fpu_cntrl_wrd_std                        = 0;

jint    StubRoutines::_fpu_cntrl_wrd_24                         = 0;

jint    StubRoutines::_fpu_cntrl_wrd_64                         = 0;

jint    StubRoutines::_fpu_cntrl_wrd_trunc                      = 0;

jint    StubRoutines::_mxcsr_std                                = 0;

jint    StubRoutines::_fpu_subnormal_bias1[3]                   = { 0, 0, 0 };

jint    StubRoutines::_fpu_subnormal_bias2[3]                   = { 0, 0, 0 };

// Compiled code entry points default values

// The default functions don't have separate disjoint versions.

address StubRoutines::_jbyte_arraycopy          = CAST_FROM_FN_PTR(address, StubRoutines::jbyte_copy);

address StubRoutines::_jshort_arraycopy         = CAST_FROM_FN_PTR(address, StubRoutines::jshort_copy);

address StubRoutines::_jint_arraycopy           = CAST_FROM_FN_PTR(address, StubRoutines::jint_copy);

address StubRoutines::_jlong_arraycopy          = CAST_FROM_FN_PTR(address, StubRoutines::jlong_copy);

address StubRoutines::_oop_arraycopy            = CAST_FROM_FN_PTR(address, StubRoutines::oop_copy);

address StubRoutines::_oop_arraycopy_uninit     = CAST_FROM_FN_PTR(address, StubRoutines::oop_copy_uninit);

address StubRoutines::_jbyte_disjoint_arraycopy          = CAST_FROM_FN_PTR(address, StubRoutines::jbyte_copy);

address StubRoutines::_jshort_disjoint_arraycopy         = CAST_FROM_FN_PTR(address, StubRoutines::jshort_copy);

address StubRoutines::_jint_disjoint_arraycopy           = CAST_FROM_FN_PTR(address, StubRoutines::jint_copy);

address StubRoutines::_jlong_disjoint_arraycopy          = CAST_FROM_FN_PTR(address, StubRoutines::jlong_copy);

address StubRoutines::_oop_disjoint_arraycopy            = CAST_FROM_FN_PTR(address, StubRoutines::oop_copy);

address StubRoutines::_oop_disjoint_arraycopy_uninit     = CAST_FROM_FN_PTR(address, StubRoutines::oop_copy_uninit);

address StubRoutines::_arrayof_jbyte_arraycopy  = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jbyte_copy);

address StubRoutines::_arrayof_jshort_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jshort_copy);

address StubRoutines::_arrayof_jint_arraycopy   = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jint_copy);

address StubRoutines::_arrayof_jlong_arraycopy  = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jlong_copy);

address StubRoutines::_arrayof_oop_arraycopy    = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_oop_copy);

address StubRoutines::_arrayof_oop_arraycopy_uninit      = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_oop_copy_uninit);

address StubRoutines::_arrayof_jbyte_disjoint_arraycopy  = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jbyte_copy);

address StubRoutines::_arrayof_jshort_disjoint_arraycopy = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jshort_copy);

address StubRoutines::_arrayof_jint_disjoint_arraycopy   = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jint_copy);

address StubRoutines::_arrayof_jlong_disjoint_arraycopy  = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_jlong_copy);

address StubRoutines::_arrayof_oop_disjoint_arraycopy    = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_oop_copy);

address StubRoutines::_arrayof_oop_disjoint_arraycopy_uninit  = CAST_FROM_FN_PTR(address, StubRoutines::arrayof_oop_copy_uninit);

address StubRoutines::_zero_aligned_words = CAST_FROM_FN_PTR(address, Copy::zero_to_words);

address StubRoutines::_checkcast_arraycopy               = NULL;

address StubRoutines::_checkcast_arraycopy_uninit        = NULL;

address StubRoutines::_unsafe_arraycopy                  = NULL;

address StubRoutines::_generic_arraycopy                 = NULL;

address StubRoutines::_jbyte_fill;

address StubRoutines::_jshort_fill;

address StubRoutines::_jint_fill;

address StubRoutines::_arrayof_jbyte_fill;

address StubRoutines::_arrayof_jshort_fill;

address StubRoutines::_arrayof_jint_fill;

address StubRoutines::_aescrypt_encryptBlock               = NULL;

address StubRoutines::_aescrypt_decryptBlock               = NULL;

address StubRoutines::_cipherBlockChaining_encryptAESCrypt = NULL;

address StubRoutines::_cipherBlockChaining_decryptAESCrypt = NULL;

address StubRoutines::_counterMode_AESCrypt                = NULL;

address StubRoutines::_ghash_processBlocks                 = NULL;

address StubRoutines::_sha1_implCompress     = NULL;

address StubRoutines::_sha1_implCompressMB   = NULL;

address StubRoutines::_sha256_implCompress   = NULL;

address StubRoutines::_sha256_implCompressMB = NULL;

address StubRoutines::_sha512_implCompress   = NULL;

address StubRoutines::_sha512_implCompressMB = NULL;

address StubRoutines::_updateBytesCRC32 = NULL;

address StubRoutines::_crc_table_adr =    NULL;

address StubRoutines::_crc32c_table_addr = NULL;

address StubRoutines::_updateBytesCRC32C = NULL;

address StubRoutines::_updateBytesAdler32 = NULL;

address StubRoutines::_multiplyToLen = NULL;

address StubRoutines::_squareToLen = NULL;

address StubRoutines::_mulAdd = NULL;

address StubRoutines::_montgomeryMultiply = NULL;

address StubRoutines::_montgomerySquare = NULL;

address StubRoutines::_vectorizedMismatch = NULL;

address StubRoutines::_dexp = NULL;

address StubRoutines::_dlog = NULL;

address StubRoutines::_dlog10 = NULL;

address StubRoutines::_dpow = NULL;

address StubRoutines::_dsin = NULL;

address StubRoutines::_dcos = NULL;

address StubRoutines::_dlibm_sin_cos_huge = NULL;

address StubRoutines::_dlibm_reduce_pi04l = NULL;

address StubRoutines::_dlibm_tan_cot_huge = NULL;

address StubRoutines::_dtan = NULL;

double (* StubRoutines::_intrinsic_log10 )(double) = NULL;

double (* StubRoutines::_intrinsic_sin   )(double) = NULL;

double (* StubRoutines::_intrinsic_cos   )(double) = NULL;

double (* StubRoutines::_intrinsic_tan   )(double) = NULL;

address StubRoutines::_safefetch32_entry                 = NULL;

address StubRoutines::_safefetch32_fault_pc              = NULL;

address StubRoutines::_safefetch32_continuation_pc       = NULL;

address StubRoutines::_safefetchN_entry                  = NULL;

address StubRoutines::_safefetchN_fault_pc               = NULL;

address StubRoutines::_safefetchN_continuation_pc        = NULL;

// Initialization

//

// Note: to break cycle with universe initialization, stubs are generated in two phases.

// The first one generates stubs needed during universe init (e.g., _handle_must_compile_first_entry).

// The second phase includes all other stubs (which may depend on universe being initialized.)

extern void StubGenerator_generate(CodeBuffer* code, bool all); // only interface to generators

void StubRoutines::initialize1() {

  if (_code1 == NULL) {

    ResourceMark rm;

    TraceTime timer("StubRoutines generation 1", TRACETIME_LOG(Info, startuptime));

    _code1 = BufferBlob::create("StubRoutines (1)", code_size1);

    if (_code1 == NULL) {

      vm_exit_out_of_memory(code_size1, OOM_MALLOC_ERROR, "CodeCache: no room for StubRoutines (1)");

    }

    CodeBuffer buffer(_code1);

    StubGenerator_generate(&buffer, false);

    // When new stubs added we need to make sure there is some space left

    // to catch situation when we should increase size again.

    assert(code_size1 == 0 || buffer.insts_remaining() > 200, "increase code_size1");

  }

}

#ifdef ASSERT

typedef void (*arraycopy_fn)(address src, address dst, int count);

// simple tests of generated arraycopy functions

static void test_arraycopy_func(address func, int alignment) {

  int v = 0xcc;

  int v2 = 0x11;

  jlong lbuffer[8];

  jlong lbuffer2[8];

  address fbuffer  = (address) lbuffer;

  address fbuffer2 = (address) lbuffer2;

  unsigned int i;

  for (i = 0; i < sizeof(lbuffer); i++) {

    fbuffer[i] = v; fbuffer2[i] = v2;

  }

  // C++ does not guarantee jlong[] array alignment to 8 bytes.

  // Use middle of array to check that memory before it is not modified.

  address buffer  = align_up((address)&lbuffer[4], BytesPerLong);

  address buffer2 = align_up((address)&lbuffer2[4], BytesPerLong);

  // do an aligned copy

  ((arraycopy_fn)func)(buffer, buffer2, 0);

  for (i = 0; i < sizeof(lbuffer); i++) {

    assert(fbuffer[i] == v && fbuffer2[i] == v2, "shouldn't have copied anything");

  }

  // adjust destination alignment

  ((arraycopy_fn)func)(buffer, buffer2 + alignment, 0);

  for (i = 0; i < sizeof(lbuffer); i++) {

    assert(fbuffer[i] == v && fbuffer2[i] == v2, "shouldn't have copied anything");

  }

  // adjust source alignment

  ((arraycopy_fn)func)(buffer + alignment, buffer2, 0);

  for (i = 0; i < sizeof(lbuffer); i++) {

    assert(fbuffer[i] == v && fbuffer2[i] == v2, "shouldn't have copied anything");

  }

}

// simple test for SafeFetch32

static void test_safefetch32() {

  if (CanUseSafeFetch32()) {

    int dummy = 17;

    int* const p_invalid = (int*) VMError::get_segfault_address();

    int* const p_valid = &dummy;

    int result_invalid = SafeFetch32(p_invalid, 0xABC);

    assert(result_invalid == 0xABC, "SafeFetch32 error");

    int result_valid = SafeFetch32(p_valid, 0xABC);

    assert(result_valid == 17, "SafeFetch32 error");

  }

}

// simple test for SafeFetchN

static void test_safefetchN() {

  if (CanUseSafeFetchN()) {

#ifdef _LP64

    const intptr_t v1 = UCONST64(0xABCD00000000ABCD);

    const intptr_t v2 = UCONST64(0xDEFD00000000DEFD);

#else

    const intptr_t v1 = 0xABCDABCD;

    const intptr_t v2 = 0xDEFDDEFD;

#endif

    intptr_t dummy = v1;

    intptr_t* const p_invalid = (intptr_t*) VMError::get_segfault_address();

    intptr_t* const p_valid = &dummy;

    intptr_t result_invalid = SafeFetchN(p_invalid, v2);

    assert(result_invalid == v2, "SafeFetchN error");

    intptr_t result_valid = SafeFetchN(p_valid, v2);

    assert(result_valid == v1, "SafeFetchN error");

  }

}

#endif

void StubRoutines::initialize2() {

  if (_code2 == NULL) {

    ResourceMark rm;

    TraceTime timer("StubRoutines generation 2", TRACETIME_LOG(Info, startuptime));

    _code2 = BufferBlob::create("StubRoutines (2)", code_size2);

    if (_code2 == NULL) {

      vm_exit_out_of_memory(code_size2, OOM_MALLOC_ERROR, "CodeCache: no room for StubRoutines (2)");

    }

    CodeBuffer buffer(_code2);

    StubGenerator_generate(&buffer, true);

    // When new stubs added we need to make sure there is some space left

    // to catch situation when we should increase size again.

    assert(code_size2 == 0 || buffer.insts_remaining() > 200, "increase code_size2");

  }

#ifdef ASSERT

#define TEST_ARRAYCOPY(type)                                                    \

  test_arraycopy_func(          type##_arraycopy(),          sizeof(type));     \

  test_arraycopy_func(          type##_disjoint_arraycopy(), sizeof(type));     \

  test_arraycopy_func(arrayof_##type##_arraycopy(),          sizeof(HeapWord)); \

  test_arraycopy_func(arrayof_##type##_disjoint_arraycopy(), sizeof(HeapWord))

  // Make sure all the arraycopy stubs properly handle zero count

  TEST_ARRAYCOPY(jbyte);

  TEST_ARRAYCOPY(jshort);

  TEST_ARRAYCOPY(jint);

  TEST_ARRAYCOPY(jlong);

#undef TEST_ARRAYCOPY

#define TEST_FILL(type)                                                                      \

  if (_##type##_fill != NULL) {                                                              \

    union {                                                                                  \

      double d;                                                                              \

      type body[96];                                                                         \

    } s;                                                                                     \

                                                                                             \

    int v = 32;                                                                              \

    for (int offset = -2; offset <= 2; offset++) {                                           \

      for (int i = 0; i < 96; i++) {                                                         \

        s.body[i] = 1;                                                                       \

      }                                                                                      \

      type* start = s.body + 8 + offset;                                                     \

      for (int aligned = 0; aligned < 2; aligned++) {                                        \

        if (aligned) {                                                                       \

          if (((intptr_t)start) % HeapWordSize == 0) {                                       \

            ((void (*)(type*, int, int))StubRoutines::_arrayof_##type##_fill)(start, v, 80); \

          } else {                                                                           \

            continue;                                                                        \

          }                                                                                  \

        } else {                                                                             \

          ((void (*)(type*, int, int))StubRoutines::_##type##_fill)(start, v, 80);           \

        }                                                                                    \

        for (int i = 0; i < 96; i++) {                                                       \

          if (i < (8 + offset) || i >= (88 + offset)) {                                      \

            assert(s.body[i] == 1, "what?");                                                 \

          } else {                                                                           \

            assert(s.body[i] == 32, "what?");                                                \

          }                                                                                  \

        }                                                                                    \

      }                                                                                      \

    }                                                                                        \

  }                                                                                          \

  TEST_FILL(jbyte);

  TEST_FILL(jshort);

  TEST_FILL(jint);

#undef TEST_FILL

#define TEST_COPYRTN(type) \

  test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::conjoint_##type##s_atomic),  sizeof(type)); \

  test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::arrayof_conjoint_##type##s), (int)MAX2(sizeof(HeapWord), sizeof(type)))

  // Make sure all the copy runtime routines properly handle zero count

  TEST_COPYRTN(jbyte);

  TEST_COPYRTN(jshort);

  TEST_COPYRTN(jint);

  TEST_COPYRTN(jlong);

#undef TEST_COPYRTN

  test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::conjoint_words), sizeof(HeapWord));

  test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::disjoint_words), sizeof(HeapWord));

  test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::disjoint_words_atomic), sizeof(HeapWord));

  // Aligned to BytesPerLong

  test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::aligned_conjoint_words), sizeof(jlong));

  test_arraycopy_func(CAST_FROM_FN_PTR(address, Copy::aligned_disjoint_words), sizeof(jlong));

  // test safefetch routines

  // Not on Windows 32bit until 8074860 is fixed

#if ! (defined(_WIN32) && defined(_M_IX86))

  test_safefetch32();

  test_safefetchN();

#endif

#endif

}

void stubRoutines_init1() { StubRoutines::initialize1(); }

void stubRoutines_init2() { StubRoutines::initialize2(); }

//

// Default versions of arraycopy functions

//

JRT_LEAF(void, StubRoutines::jbyte_copy(jbyte* src, jbyte* dest, size_t count))

#ifndef PRODUCT

  SharedRuntime::_jbyte_array_copy_ctr++;      // Slow-path byte array copy

#endif // !PRODUCT

  Copy::conjoint_jbytes_atomic(src, dest, count);

JRT_END

JRT_LEAF(void, StubRoutines::jshort_copy(jshort* src, jshort* dest, size_t count))

#ifndef PRODUCT

  SharedRuntime::_jshort_array_copy_ctr++;     // Slow-path short/char array copy

#endif // !PRODUCT

  Copy::conjoint_jshorts_atomic(src, dest, count);

JRT_END

JRT_LEAF(void, StubRoutines::jint_copy(jint* src, jint* dest, size_t count))

#ifndef PRODUCT

  SharedRuntime::_jint_array_copy_ctr++;       // Slow-path int/float array copy

#endif // !PRODUCT

  Copy::conjoint_jints_atomic(src, dest, count);

JRT_END

JRT_LEAF(void, StubRoutines::jlong_copy(jlong* src, jlong* dest, size_t count))

#ifndef PRODUCT

  SharedRuntime::_jlong_array_copy_ctr++;      // Slow-path long/double array copy

#endif // !PRODUCT

  Copy::conjoint_jlongs_atomic(src, dest, count);

JRT_END

JRT_LEAF(void, StubRoutines::oop_copy(oop* src, oop* dest, size_t count))

#ifndef PRODUCT

  SharedRuntime::_oop_array_copy_ctr++;        // Slow-path oop array copy

#endif // !PRODUCT

  assert(count != 0, "count should be non-zero");

  ArrayAccess<>::oop_arraycopy_raw((HeapWord*)src, (HeapWord*)dest, count);

JRT_END

JRT_LEAF(void, StubRoutines::oop_copy_uninit(oop* src, oop* dest, size_t count))

#ifndef PRODUCT

  SharedRuntime::_oop_array_copy_ctr++;        // Slow-path oop array copy

#endif // !PRODUCT

  assert(count != 0, "count should be non-zero");

  ArrayAccess<IS_DEST_UNINITIALIZED>::oop_arraycopy_raw((HeapWord*)src, (HeapWord*)dest, count);

JRT_END

JRT_LEAF(void, StubRoutines::arrayof_jbyte_copy(HeapWord* src, HeapWord* dest, size_t count))

#ifndef PRODUCT

  SharedRuntime::_jbyte_array_copy_ctr++;      // Slow-path byte array copy

#endif // !PRODUCT

  Copy::arrayof_conjoint_jbytes(src, dest, count);

JRT_END

JRT_LEAF(void, StubRoutines::arrayof_jshort_copy(HeapWord* src, HeapWord* dest, size_t count))

#ifndef PRODUCT

  SharedRuntime::_jshort_array_copy_ctr++;     // Slow-path short/char array copy

#endif // !PRODUCT

  Copy::arrayof_conjoint_jshorts(src, dest, count);

JRT_END

JRT_LEAF(void, StubRoutines::arrayof_jint_copy(HeapWord* src, HeapWord* dest, size_t count))

#ifndef PRODUCT

  SharedRuntime::_jint_array_copy_ctr++;       // Slow-path int/float array copy

#endif // !PRODUCT

  Copy::arrayof_conjoint_jints(src, dest, count);

JRT_END

JRT_LEAF(void, StubRoutines::arrayof_jlong_copy(HeapWord* src, HeapWord* dest, size_t count))

#ifndef PRODUCT

  SharedRuntime::_jlong_array_copy_ctr++;       // Slow-path int/float array copy

#endif // !PRODUCT

  Copy::arrayof_conjoint_jlongs(src, dest, count);

JRT_END

JRT_LEAF(void, StubRoutines::arrayof_oop_copy(HeapWord* src, HeapWord* dest, size_t count))

#ifndef PRODUCT

  SharedRuntime::_oop_array_copy_ctr++;        // Slow-path oop array copy

#endif // !PRODUCT

  assert(count != 0, "count should be non-zero");

  ArrayAccess<ARRAYCOPY_ARRAYOF>::oop_arraycopy_raw(src, dest, count);

JRT_END

JRT_LEAF(void, StubRoutines::arrayof_oop_copy_uninit(HeapWord* src, HeapWord* dest, size_t count))

#ifndef PRODUCT

  SharedRuntime::_oop_array_copy_ctr++;        // Slow-path oop array copy

#endif // !PRODUCT

  assert(count != 0, "count should be non-zero");

  ArrayAccess<ARRAYCOPY_ARRAYOF | IS_DEST_UNINITIALIZED>::oop_arraycopy_raw(src, dest, count);

JRT_END

address StubRoutines::select_fill_function(BasicType t, bool aligned, const char* &name) {

#define RETURN_STUB(xxx_fill) { \

  name = #xxx_fill; \

  return StubRoutines::xxx_fill(); }

  switch (t) {

  case T_BYTE:

  case T_BOOLEAN:

    if (!aligned) RETURN_STUB(jbyte_fill);

    RETURN_STUB(arrayof_jbyte_fill);

  case T_CHAR:

  case T_SHORT:

    if (!aligned) RETURN_STUB(jshort_fill);

    RETURN_STUB(arrayof_jshort_fill);

  case T_INT:

  case T_FLOAT:

    if (!aligned) RETURN_STUB(jint_fill);

    RETURN_STUB(arrayof_jint_fill);

  case T_DOUBLE:

  case T_LONG:

  case T_ARRAY:

  case T_OBJECT:

  case T_NARROWOOP:

  case T_NARROWKLASS:

  case T_ADDRESS:

    // Currently unsupported

    return NULL;

  default:

    ShouldNotReachHere();

    return NULL;

  }

#undef RETURN_STUB