/*
* 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*wordSize
// Instead of issuing lfence for LoadLoad barrier, we create data dependency
// between loads, which is more efficient than lfence.
// Common register usage:
// rax/xmm0: result
// c_rarg0: jni env
// c_rarg1: obj
// c_rarg2: jfield id
static const Register robj = r9;
static const Register rcounter = r10;
static const Register roffset = r11;
static const Register rcounter_addr = r11;
// Warning: do not use rip relative addressing after the first counter load
// since that may scratch r10!
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;
case T_LONG: name = "jni_fast_GetLongField"; break;
default: ShouldNotReachHere();
}
ResourceMark rm;
BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE);
CodeBuffer cbuf(blob);
MacroAssembler* masm = new MacroAssembler(&cbuf);
address fast_entry = __ pc();
Label slow;
ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
__ mov32 (rcounter, counter);
__ mov (robj, c_rarg1);
__ testb (rcounter, 1);
__ jcc (Assembler::notZero, slow);
if (os::is_MP()) {
__ xorptr(robj, rcounter);
__ xorptr(robj, rcounter); // obj, since
// robj ^ rcounter ^ rcounter == robj
// robj is data dependent on rcounter.
}
__ movptr(robj, Address(robj, 0)); // *obj
__ mov (roffset, c_rarg2);
__ shrptr(roffset, 2); // offset
assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
speculative_load_pclist[count] = __ pc();
switch (type) {
case T_BOOLEAN: __ movzbl (rax, Address(robj, roffset, Address::times_1)); break;
case T_BYTE: __ movsbl (rax, Address(robj, roffset, Address::times_1)); break;
case T_CHAR: __ movzwl (rax, Address(robj, roffset, Address::times_1)); break;
case T_SHORT: __ movswl (rax, Address(robj, roffset, Address::times_1)); break;
case T_INT: __ movl (rax, Address(robj, roffset, Address::times_1)); break;
case T_LONG: __ movq (rax, Address(robj, roffset, Address::times_1)); break;
default: ShouldNotReachHere();
}
if (os::is_MP()) {
__ lea(rcounter_addr, counter);
// ca is data dependent on rax.
__ xorptr(rcounter_addr, rax);
__ xorptr(rcounter_addr, rax);
__ cmpl (rcounter, Address(rcounter_addr, 0));
} else {
__ cmp32 (rcounter, counter);
}
__ jcc (Assembler::notEqual, slow);
__ ret (0);
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(); break;
case T_LONG: slow_case_addr = jni_GetLongField_addr();
}
// tail call
__ jump (ExternalAddress(slow_case_addr));
__ flush ();
return fast_entry;
}
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() {
return generate_fast_get_int_field0(T_LONG);
}
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);
CodeBuffer cbuf(blob);
MacroAssembler* masm = new MacroAssembler(&cbuf);
address fast_entry = __ pc();
Label slow;
ExternalAddress counter(SafepointSynchronize::safepoint_counter_addr());
__ mov32 (rcounter, counter);
__ mov (robj, c_rarg1);
__ testb (rcounter, 1);
__ jcc (Assembler::notZero, slow);
if (os::is_MP()) {
__ xorptr(robj, rcounter);
__ xorptr(robj, rcounter); // obj, since
// robj ^ rcounter ^ rcounter == robj
// robj is data dependent on rcounter.
}
__ movptr(robj, Address(robj, 0)); // *obj
__ mov (roffset, c_rarg2);
__ shrptr(roffset, 2); // offset
assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
speculative_load_pclist[count] = __ pc();
switch (type) {
case T_FLOAT: __ movflt (xmm0, Address(robj, roffset, Address::times_1)); break;
case T_DOUBLE: __ movdbl (xmm0, Address(robj, roffset, Address::times_1)); break;
default: ShouldNotReachHere();
}
if (os::is_MP()) {
__ lea(rcounter_addr, counter);
__ movdq (rax, xmm0);
// counter address is data dependent on xmm0.
__ xorptr(rcounter_addr, rax);
__ xorptr(rcounter_addr, rax);
__ cmpl (rcounter, Address(rcounter_addr, 0));
} else {
__ cmp32 (rcounter, counter);
}
__ jcc (Assembler::notEqual, slow);
__ ret (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();
}
// tail call
__ jump (ExternalAddress(slow_case_addr));
__ flush ();
return fast_entry;
}
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);
}