8200235: Generalize jniFastGetField jobject/jweak resolve
Reviewed-by: kbarrett, dholmes
/*
* Copyright (c) 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.
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*/
#include "precompiled.hpp"
#include "gc/shared/barrierSetAssembler.hpp"
#include "interpreter/interp_masm.hpp"
#include "runtime/jniHandles.hpp"
#define __ masm->
void BarrierSetAssembler::load_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
Register dst, Address src, Register tmp1, Register tmp_thread) {
bool on_heap = (decorators & IN_HEAP) != 0;
bool on_root = (decorators & IN_ROOT) != 0;
bool oop_not_null = (decorators & OOP_NOT_NULL) != 0;
switch (type) {
case T_OBJECT:
case T_ARRAY: {
if (on_heap) {
#ifdef _LP64
if (UseCompressedOops) {
__ movl(dst, src);
if (oop_not_null) {
__ decode_heap_oop_not_null(dst);
} else {
__ decode_heap_oop(dst);
}
} else
#endif
{
__ movptr(dst, src);
}
} else {
assert(on_root, "why else?");
__ movptr(dst, src);
}
break;
}
default: Unimplemented();
}
}
void BarrierSetAssembler::store_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
Address dst, Register val, Register tmp1, Register tmp2) {
bool on_heap = (decorators & IN_HEAP) != 0;
bool on_root = (decorators & IN_ROOT) != 0;
bool oop_not_null = (decorators & OOP_NOT_NULL) != 0;
switch (type) {
case T_OBJECT:
case T_ARRAY: {
if (on_heap) {
if (val == noreg) {
assert(!oop_not_null, "inconsistent access");
#ifdef _LP64
if (UseCompressedOops) {
__ movl(dst, (int32_t)NULL_WORD);
} else {
__ movslq(dst, (int32_t)NULL_WORD);
}
#else
__ movl(dst, (int32_t)NULL_WORD);
#endif
} else {
#ifdef _LP64
if (UseCompressedOops) {
assert(!dst.uses(val), "not enough registers");
if (oop_not_null) {
__ encode_heap_oop_not_null(val);
} else {
__ encode_heap_oop(val);
}
__ movl(dst, val);
} else
#endif
{
__ movptr(dst, val);
}
}
} else {
assert(on_root, "why else?");
assert(val != noreg, "not supported");
__ movptr(dst, val);
}
break;
}
default: Unimplemented();
}
}
void BarrierSetAssembler::try_resolve_jobject_in_native(MacroAssembler* masm, Register robj, Register tmp, Label& slowpath) {
__ clear_jweak_tag(robj);
__ movptr(robj, Address(robj, 0));
}