JDK14/Java14源码在线阅读
/*
* Copyright (c) 1997, 2019, 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 "asm/macroAssembler.inline.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
UnsafeCopyMemory* UnsafeCopyMemory::_table = NULL;
int UnsafeCopyMemory::_table_length = 0;
int UnsafeCopyMemory::_table_max_length = 0;
address UnsafeCopyMemory::_common_exit_stub_pc = NULL;
// 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_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::_data_cache_writeback = NULL;
address StubRoutines::_data_cache_writeback_sync = NULL;
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::_electronicCodeBook_encryptAESCrypt = NULL;
address StubRoutines::_electronicCodeBook_decryptAESCrypt = NULL;
address StubRoutines::_counterMode_AESCrypt = NULL;
address StubRoutines::_ghash_processBlocks = NULL;
address StubRoutines::_base64_encodeBlock = 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;
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 UnsafeCopyMemory::create_table(int max_size) {
UnsafeCopyMemory::_table = new UnsafeCopyMemory[max_size];
UnsafeCopyMemory::_table_max_length = max_size;
}
bool UnsafeCopyMemory::contains_pc(address pc) {
for (int i = 0; i < UnsafeCopyMemory::_table_length; i++) {
UnsafeCopyMemory* entry = &UnsafeCopyMemory::_table[i];
if (pc >= entry->start_pc() && pc < entry->end_pc()) {
return true;
}
}
return false;
}
address UnsafeCopyMemory::page_error_continue_pc(address pc) {
for (int i = 0; i < UnsafeCopyMemory::_table_length; i++) {
UnsafeCopyMemory* entry = &UnsafeCopyMemory::_table[i];
if (pc >= entry->start_pc() && pc < entry->end_pc()) {
return entry->error_exit_pc();
}
}
return NULL;
}
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
}
// constants for computing the copy function
enum {
COPYFUNC_UNALIGNED = 0,
COPYFUNC_ALIGNED = 1, // src, dest aligned to HeapWordSize
COPYFUNC_CONJOINT = 0,
COPYFUNC_DISJOINT = 2 // src != dest, or transfer can descend
};
// Note: The condition "disjoint" applies also for overlapping copies
// where an descending copy is permitted (i.e., dest_offset <= src_offset).
address
StubRoutines::select_arraycopy_function(BasicType t, bool aligned, bool disjoint, const char* &name, bool dest_uninitialized) {
int selector =
(aligned ? COPYFUNC_ALIGNED : COPYFUNC_UNALIGNED) +
(disjoint ? COPYFUNC_DISJOINT : COPYFUNC_CONJOINT);
#define RETURN_STUB(xxx_arraycopy) { \
name = #xxx_arraycopy; \
return StubRoutines::xxx_arraycopy(); }
#define RETURN_STUB_PARM(xxx_arraycopy, parm) { \
name = #xxx_arraycopy; \
return StubRoutines::xxx_arraycopy(parm); }
switch (t) {
case T_BYTE:
case T_BOOLEAN:
switch (selector) {
case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(jbyte_arraycopy);
case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_jbyte_arraycopy);
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