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201 lines
7.1 KiB
C++
201 lines
7.1 KiB
C++
/*
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* Copyright (c) 2004, 2020, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2014, 2020, Red Hat Inc. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "asm/macroAssembler.hpp"
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#include "gc/shared/barrierSet.hpp"
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#include "gc/shared/barrierSetAssembler.hpp"
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#include "memory/resourceArea.hpp"
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#include "prims/jniFastGetField.hpp"
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#include "prims/jvm_misc.hpp"
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#include "runtime/safepoint.hpp"
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#define __ masm->
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#define BUFFER_SIZE 30*wordSize
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// Instead of issuing a LoadLoad barrier we create an address
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// dependency between loads; this might be more efficient.
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// Common register usage:
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// r0/v0: result
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// c_rarg0: jni env
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// c_rarg1: obj
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// c_rarg2: jfield id
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static const Register robj = r3;
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static const Register rcounter = r4;
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static const Register roffset = r5;
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static const Register rcounter_addr = r6;
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static const Register result = r7;
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address JNI_FastGetField::generate_fast_get_int_field0(BasicType type) {
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const char *name;
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switch (type) {
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case T_BOOLEAN: name = "jni_fast_GetBooleanField"; break;
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case T_BYTE: name = "jni_fast_GetByteField"; break;
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case T_CHAR: name = "jni_fast_GetCharField"; break;
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case T_SHORT: name = "jni_fast_GetShortField"; break;
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case T_INT: name = "jni_fast_GetIntField"; break;
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case T_LONG: name = "jni_fast_GetLongField"; break;
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case T_FLOAT: name = "jni_fast_GetFloatField"; break;
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case T_DOUBLE: name = "jni_fast_GetDoubleField"; break;
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default: ShouldNotReachHere();
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name = NULL; // unreachable
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}
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ResourceMark rm;
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BufferBlob* blob = BufferBlob::create(name, BUFFER_SIZE);
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CodeBuffer cbuf(blob);
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MacroAssembler* masm = new MacroAssembler(&cbuf);
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address fast_entry = __ pc();
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Label slow;
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uint64_t offset;
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__ adrp(rcounter_addr,
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SafepointSynchronize::safepoint_counter_addr(), offset);
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Address safepoint_counter_addr(rcounter_addr, offset);
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__ ldrw(rcounter, safepoint_counter_addr);
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__ tbnz(rcounter, 0, slow);
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// It doesn't need to issue a full barrier here even if the field
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// is volatile, since it has already used "ldar" for it.
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if (JvmtiExport::can_post_field_access()) {
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// Using barrier to order wrt. JVMTI check and load of result.
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__ membar(Assembler::LoadLoad);
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// Check to see if a field access watch has been set before we
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// take the fast path.
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uint64_t offset2;
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__ adrp(result,
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ExternalAddress((address) JvmtiExport::get_field_access_count_addr()),
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offset2);
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__ ldrw(result, Address(result, offset2));
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__ cbnzw(result, slow);
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__ mov(robj, c_rarg1);
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} else {
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// Using address dependency to order wrt. load of result.
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__ eor(robj, c_rarg1, rcounter);
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__ eor(robj, robj, rcounter); // obj, since
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// robj ^ rcounter ^ rcounter == robj
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// robj is address dependent on rcounter.
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}
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// Both robj and rscratch1 are clobbered by try_resolve_jobject_in_native.
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BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
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bs->try_resolve_jobject_in_native(masm, c_rarg0, robj, rscratch1, slow);
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__ lsr(roffset, c_rarg2, 2); // offset
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__ add(result, robj, roffset);
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assert(count < LIST_CAPACITY, "LIST_CAPACITY too small");
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speculative_load_pclist[count] = __ pc(); // Used by the segfault handler
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// Using acquire: Order JVMTI check and load of result wrt. succeeding check
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// (LoadStore for volatile field).
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switch (type) {
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case T_BOOLEAN: __ ldarb(result, result); break;
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case T_BYTE: __ ldarb(result, result); __ sxtb(result, result); break;
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case T_CHAR: __ ldarh(result, result); break;
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case T_SHORT: __ ldarh(result, result); __ sxth(result, result); break;
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case T_FLOAT: __ ldarw(result, result); break;
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case T_INT: __ ldarw(result, result); __ sxtw(result, result); break;
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case T_DOUBLE:
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case T_LONG: __ ldar (result, result); break;
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default: ShouldNotReachHere();
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}
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__ ldrw(rscratch1, safepoint_counter_addr);
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__ cmpw(rcounter, rscratch1);
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__ br (Assembler::NE, slow);
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switch (type) {
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case T_FLOAT: __ fmovs(v0, result); break;
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case T_DOUBLE: __ fmovd(v0, result); break;
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default: __ mov(r0, result); break;
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}
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__ ret(lr);
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slowcase_entry_pclist[count++] = __ pc();
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__ bind(slow);
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address slow_case_addr;
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switch (type) {
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case T_BOOLEAN: slow_case_addr = jni_GetBooleanField_addr(); break;
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case T_BYTE: slow_case_addr = jni_GetByteField_addr(); break;
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case T_CHAR: slow_case_addr = jni_GetCharField_addr(); break;
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case T_SHORT: slow_case_addr = jni_GetShortField_addr(); break;
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case T_INT: slow_case_addr = jni_GetIntField_addr(); break;
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case T_LONG: slow_case_addr = jni_GetLongField_addr(); break;
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case T_FLOAT: slow_case_addr = jni_GetFloatField_addr(); break;
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case T_DOUBLE: slow_case_addr = jni_GetDoubleField_addr(); break;
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default: ShouldNotReachHere();
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slow_case_addr = NULL; // unreachable
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}
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{
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__ enter();
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__ lea(rscratch1, ExternalAddress(slow_case_addr));
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__ blr(rscratch1);
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__ maybe_isb();
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__ leave();
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__ ret(lr);
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}
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__ flush ();
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return fast_entry;
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}
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address JNI_FastGetField::generate_fast_get_boolean_field() {
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return generate_fast_get_int_field0(T_BOOLEAN);
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}
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address JNI_FastGetField::generate_fast_get_byte_field() {
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return generate_fast_get_int_field0(T_BYTE);
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}
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address JNI_FastGetField::generate_fast_get_char_field() {
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return generate_fast_get_int_field0(T_CHAR);
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}
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address JNI_FastGetField::generate_fast_get_short_field() {
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return generate_fast_get_int_field0(T_SHORT);
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}
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address JNI_FastGetField::generate_fast_get_int_field() {
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return generate_fast_get_int_field0(T_INT);
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}
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address JNI_FastGetField::generate_fast_get_long_field() {
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return generate_fast_get_int_field0(T_LONG);
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}
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address JNI_FastGetField::generate_fast_get_float_field() {
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return generate_fast_get_int_field0(T_FLOAT);
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}
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address JNI_FastGetField::generate_fast_get_double_field() {
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return generate_fast_get_int_field0(T_DOUBLE);
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}
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