/*
* Copyright (c) 2004, 2010, 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 "assembler_x86.inline.hpp"
#include "memory/resourceArea.hpp"
#include "prims/jniFastGetField.hpp"
#include "prims/jvm_misc.hpp"
#include "runtime/safepoint.hpp"
#define __ masm->
#define BUFFER_SIZE 30
#ifdef _WINDOWS
GetBooleanField_t JNI_FastGetField::jni_fast_GetBooleanField_fp;
GetByteField_t JNI_FastGetField::jni_fast_GetByteField_fp;
GetCharField_t JNI_FastGetField::jni_fast_GetCharField_fp;
GetShortField_t JNI_FastGetField::jni_fast_GetShortField_fp;
GetIntField_t JNI_FastGetField::jni_fast_GetIntField_fp;
GetLongField_t JNI_FastGetField::jni_fast_GetLongField_fp;
GetFloatField_t JNI_FastGetField::jni_fast_GetFloatField_fp;
GetDoubleField_t JNI_FastGetField::jni_fast_GetDoubleField_fp;
#endif
// Instead of issuing lfence for LoadLoad barrier, we create data dependency
// between loads, which is much more efficient than lfence.
address JNI_FastGetField::generate_fast_get_int_field0(BasicType type) {
const char *name;
switch (type) {
case T_BOOLEAN: name = "jni_fast_GetBooleanField"; break;
case T_BYTE: name = "jni_fast_GetByteField"; break;
case T_CHAR: name = "jni_fast_GetCharField"; break;
case T_SHORT: name = "jni_fast_GetShortField"; break;
case T_INT: name = "jni_fast_GetIntField"; break;
default: ShouldNotReachHere();
}
ResourceMark rm;
BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE*wordSize);
CodeBuffer cbuf(blob);
MacroAssembler* masm = new MacroAssembler(&cbuf);
address fast_entry = __ pc();
Label slow;
// stack layout: offset from rsp (in words):
// return pc 0
// jni env 1
// obj 2
// jfieldID 3
ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
__ mov32 (rcx, counter);
__ testb (rcx, 1);
__ jcc (Assembler::notZero, slow);
if (os::is_MP()) {
__ mov(rax, rcx);
__ andptr(rax, 1); // rax, must end up 0
__ movptr(rdx, Address(rsp, rax, Address::times_1, 2*wordSize));
// obj, notice rax, is 0.
// rdx is data dependent on rcx.
} else {
__ movptr (rdx, Address(rsp, 2*wordSize)); // obj
}
__ movptr(rax, Address(rsp, 3*wordSize)); // jfieldID
__ movptr(rdx, Address(rdx, 0)); // *obj
__ shrptr (rax, 2); // offset
assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
speculative_load_pclist[count] = __ pc();
switch (type) {
case T_BOOLEAN: __ movzbl (rax, Address(rdx, rax, Address::times_1)); break;
case T_BYTE: __ movsbl (rax, Address(rdx, rax, Address::times_1)); break;
case T_CHAR: __ movzwl (rax, Address(rdx, rax, Address::times_1)); break;
case T_SHORT: __ movswl (rax, Address(rdx, rax, Address::times_1)); break;
case T_INT: __ movl (rax, Address(rdx, rax, Address::times_1)); break;
default: ShouldNotReachHere();
}
Address ca1;
if (os::is_MP()) {
__ lea(rdx, counter);
__ xorptr(rdx, rax);
__ xorptr(rdx, rax);
__ cmp32(rcx, Address(rdx, 0));
// ca1 is the same as ca because
// rax, ^ counter_addr ^ rax, = address
// ca1 is data dependent on rax,.
} else {
__ cmp32(rcx, counter);
}
__ jcc (Assembler::notEqual, slow);
#ifndef _WINDOWS
__ ret (0);
#else
// __stdcall calling convention
__ ret (3*wordSize);
#endif
slowcase_entry_pclist[count++] = __ pc();
__ bind (slow);
address slow_case_addr;
switch (type) {
case T_BOOLEAN: slow_case_addr = jni_GetBooleanField_addr(); break;
case T_BYTE: slow_case_addr = jni_GetByteField_addr(); break;
case T_CHAR: slow_case_addr = jni_GetCharField_addr(); break;
case T_SHORT: slow_case_addr = jni_GetShortField_addr(); break;
case T_INT: slow_case_addr = jni_GetIntField_addr();
}
// tail call
__ jump (ExternalAddress(slow_case_addr));
__ flush ();
#ifndef _WINDOWS
return fast_entry;
#else
switch (type) {
case T_BOOLEAN: jni_fast_GetBooleanField_fp = (GetBooleanField_t) fast_entry; break;
case T_BYTE: jni_fast_GetByteField_fp = (GetByteField_t) fast_entry; break;
case T_CHAR: jni_fast_GetCharField_fp = (GetCharField_t) fast_entry; break;
case T_SHORT: jni_fast_GetShortField_fp = (GetShortField_t) fast_entry; break;
case T_INT: jni_fast_GetIntField_fp = (GetIntField_t) fast_entry; break;
}
return os::win32::fast_jni_accessor_wrapper(type);
#endif
}
address JNI_FastGetField::generate_fast_get_boolean_field() {
return generate_fast_get_int_field0(T_BOOLEAN);
}
address JNI_FastGetField::generate_fast_get_byte_field() {
return generate_fast_get_int_field0(T_BYTE);
}
address JNI_FastGetField::generate_fast_get_char_field() {
return generate_fast_get_int_field0(T_CHAR);
}
address JNI_FastGetField::generate_fast_get_short_field() {
return generate_fast_get_int_field0(T_SHORT);
}
address JNI_FastGetField::generate_fast_get_int_field() {
return generate_fast_get_int_field0(T_INT);
}
address JNI_FastGetField::generate_fast_get_long_field() {
const char *name = "jni_fast_GetLongField";
ResourceMark rm;
BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE*wordSize);
CodeBuffer cbuf(blob);
MacroAssembler* masm = new MacroAssembler(&cbuf);
address fast_entry = __ pc();
Label slow;
// stack layout: offset from rsp (in words):
// old rsi 0
// return pc 1
// jni env 2
// obj 3
// jfieldID 4
ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
__ push (rsi);
__ mov32 (rcx, counter);
__ testb (rcx, 1);
__ jcc (Assembler::notZero, slow);
if (os::is_MP()) {
__ mov(rax, rcx);
__ andptr(rax, 1); // rax, must end up 0
__ movptr(rdx, Address(rsp, rax, Address::times_1, 3*wordSize));
// obj, notice rax, is 0.
// rdx is data dependent on rcx.
} else {
__ movptr(rdx, Address(rsp, 3*wordSize)); // obj
}
__ movptr(rsi, Address(rsp, 4*wordSize)); // jfieldID
__ movptr(rdx, Address(rdx, 0)); // *obj
__ shrptr(rsi, 2); // offset
assert(count < LIST_CAPACITY-1, "LIST_CAPACITY too small");
speculative_load_pclist[count++] = __ pc();
__ movptr(rax, Address(rdx, rsi, Address::times_1));
#ifndef _LP64
speculative_load_pclist[count] = __ pc();
__ movl(rdx, Address(rdx, rsi, Address::times_1, 4));
#endif // _LP64
if (os::is_MP()) {
__ lea(rsi, counter);
__ xorptr(rsi, rdx);
__ xorptr(rsi, rax);
__ xorptr(rsi, rdx);
__ xorptr(rsi, rax);
__ cmp32(rcx, Address(rsi, 0));
// ca1 is the same as ca because
// rax, ^ rdx ^ counter_addr ^ rax, ^ rdx = address
// ca1 is data dependent on both rax, and rdx.
} else {
__ cmp32(rcx, counter);
}
__ jcc (Assembler::notEqual, slow);
__ pop (rsi);
#ifndef _WINDOWS
__ ret (0);
#else
// __stdcall calling convention
__ ret (3*wordSize);
#endif
slowcase_entry_pclist[count-1] = __ pc();
slowcase_entry_pclist[count++] = __ pc();
__ bind (slow);
__ pop (rsi);
address slow_case_addr = jni_GetLongField_addr();;
// tail call
__ jump (ExternalAddress(slow_case_addr));
__ flush ();
#ifndef _WINDOWS
return fast_entry;
#else
jni_fast_GetLongField_fp = (GetLongField_t) fast_entry;
return os::win32::fast_jni_accessor_wrapper(T_LONG);
#endif
}
address JNI_FastGetField::generate_fast_get_float_field0(BasicType type) {
const char *name;
switch (type) {
case T_FLOAT: name = "jni_fast_GetFloatField"; break;
case T_DOUBLE: name = "jni_fast_GetDoubleField"; break;
default: ShouldNotReachHere();
}
ResourceMark rm;
BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE*wordSize);
CodeBuffer cbuf(blob);
MacroAssembler* masm = new MacroAssembler(&cbuf);
address fast_entry = __ pc();
Label slow_with_pop, slow;
// stack layout: offset from rsp (in words):
// return pc 0
// jni env 1
// obj 2
// jfieldID 3
ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
__ mov32 (rcx, counter);
__ testb (rcx, 1);
__ jcc (Assembler::notZero, slow);
if (os::is_MP()) {
__ mov(rax, rcx);
__ andptr(rax, 1); // rax, must end up 0
__ movptr(rdx, Address(rsp, rax, Address::times_1, 2*wordSize));
// obj, notice rax, is 0.
// rdx is data dependent on rcx.
} else {
__ movptr(rdx, Address(rsp, 2*wordSize)); // obj
}
__ movptr(rax, Address(rsp, 3*wordSize)); // jfieldID
__ movptr(rdx, Address(rdx, 0)); // *obj
__ shrptr(rax, 2); // offset
assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
speculative_load_pclist[count] = __ pc();
switch (type) {
#ifndef _LP64
case T_FLOAT: __ fld_s (Address(rdx, rax, Address::times_1)); break;
case T_DOUBLE: __ fld_d (Address(rdx, rax, Address::times_1)); break;
#else
case T_FLOAT: __ movflt (xmm0, Address(robj, roffset, Address::times_1)); break;
case T_DOUBLE: __ movdbl (xmm0, Address(robj, roffset, Address::times_1)); break;
#endif // _LP64
default: ShouldNotReachHere();
}
Address ca1;
if (os::is_MP()) {
__ fst_s (Address(rsp, -4));
__ lea(rdx, counter);
__ movl (rax, Address(rsp, -4));
// garbage hi-order bits on 64bit are harmless.
__ xorptr(rdx, rax);
__ xorptr(rdx, rax);
__ cmp32(rcx, Address(rdx, 0));
// rax, ^ counter_addr ^ rax, = address
// ca1 is data dependent on the field
// access.
} else {
__ cmp32(rcx, counter);
}
__ jcc (Assembler::notEqual, slow_with_pop);
#ifndef _WINDOWS
__ ret (0);
#else
// __stdcall calling convention
__ ret (3*wordSize);
#endif
__ bind (slow_with_pop);
// invalid load. pop FPU stack.
__ fstp_d (0);
slowcase_entry_pclist[count++] = __ pc();
__ bind (slow);
address slow_case_addr;
switch (type) {
case T_FLOAT: slow_case_addr = jni_GetFloatField_addr(); break;
case T_DOUBLE: slow_case_addr = jni_GetDoubleField_addr(); break;
default: ShouldNotReachHere();
}
// tail call
__ jump (ExternalAddress(slow_case_addr));
__ flush ();
#ifndef _WINDOWS
return fast_entry;
#else
switch (type) {
case T_FLOAT: jni_fast_GetFloatField_fp = (GetFloatField_t) fast_entry; break;
case T_DOUBLE: jni_fast_GetDoubleField_fp = (GetDoubleField_t) fast_entry; break;
}
return os::win32::fast_jni_accessor_wrapper(type);
#endif
}
address JNI_FastGetField::generate_fast_get_float_field() {
return generate_fast_get_float_field0(T_FLOAT);
}
address JNI_FastGetField::generate_fast_get_double_field() {
return generate_fast_get_float_field0(T_DOUBLE);
}