--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/cpu/aarch64/vtableStubs_aarch64.cpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,250 @@
+/*
+ * Copyright (c) 2003, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, Red Hat Inc. 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/macroAssembler.hpp"
+#include "assembler_aarch64.inline.hpp"
+#include "code/vtableStubs.hpp"
+#include "interp_masm_aarch64.hpp"
+#include "memory/resourceArea.hpp"
+#include "oops/instanceKlass.hpp"
+#include "oops/klassVtable.hpp"
+#include "runtime/sharedRuntime.hpp"
+#include "vmreg_aarch64.inline.hpp"
+#ifdef COMPILER2
+#include "opto/runtime.hpp"
+#endif
+
+// machine-dependent part of VtableStubs: create VtableStub of correct size and
+// initialize its code
+
+#define __ masm->
+
+#ifndef PRODUCT
+extern "C" void bad_compiled_vtable_index(JavaThread* thread,
+ oop receiver,
+ int index);
+#endif
+
+VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
+ const int aarch64_code_length = VtableStub::pd_code_size_limit(true);
+ VtableStub* s = new(aarch64_code_length) VtableStub(true, vtable_index);
+ // Can be NULL if there is no free space in the code cache.
+ if (s == NULL) {
+ return NULL;
+ }
+
+ ResourceMark rm;
+ CodeBuffer cb(s->entry_point(), aarch64_code_length);
+ MacroAssembler* masm = new MacroAssembler(&cb);
+
+#ifndef PRODUCT
+ if (CountCompiledCalls) {
+ __ lea(r19, ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
+ __ incrementw(Address(r19));
+ }
+#endif
+
+ // get receiver (need to skip return address on top of stack)
+ assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0");
+
+ // get receiver klass
+ address npe_addr = __ pc();
+ __ load_klass(r19, j_rarg0);
+
+#ifndef PRODUCT
+ if (DebugVtables) {
+ Label L;
+ // check offset vs vtable length
+ __ ldrw(rscratch1, Address(r19, Klass::vtable_length_offset()));
+ __ cmpw(rscratch1, vtable_index * vtableEntry::size());
+ __ br(Assembler::GT, L);
+ __ enter();
+ __ mov(r2, vtable_index);
+ __ call_VM(noreg,
+ CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), j_rarg0, r2);
+ __ leave();
+ __ bind(L);
+ }
+#endif // PRODUCT
+
+ __ lookup_virtual_method(r19, vtable_index, rmethod);
+
+ if (DebugVtables) {
+ Label L;
+ __ cbz(rmethod, L);
+ __ ldr(rscratch1, Address(rmethod, Method::from_compiled_offset()));
+ __ cbnz(rscratch1, L);
+ __ stop("Vtable entry is NULL");
+ __ bind(L);
+ }
+ // r0: receiver klass
+ // rmethod: Method*
+ // r2: receiver
+ address ame_addr = __ pc();
+ __ ldr(rscratch1, Address(rmethod, Method::from_compiled_offset()));
+ __ br(rscratch1);
+
+ __ flush();
+
+ if (PrintMiscellaneous && (WizardMode || Verbose)) {
+ tty->print_cr("vtable #%d at " PTR_FORMAT "[%d] left over: %d",
+ vtable_index, p2i(s->entry_point()),
+ (int)(s->code_end() - s->entry_point()),
+ (int)(s->code_end() - __ pc()));
+ }
+ guarantee(__ pc() <= s->code_end(), "overflowed buffer");
+
+ s->set_exception_points(npe_addr, ame_addr);
+ return s;
+}
+
+
+VtableStub* VtableStubs::create_itable_stub(int itable_index) {
+ // Note well: pd_code_size_limit is the absolute minimum we can get
+ // away with. If you add code here, bump the code stub size
+ // returned by pd_code_size_limit!
+ const int code_length = VtableStub::pd_code_size_limit(false);
+ VtableStub* s = new(code_length) VtableStub(false, itable_index);
+ ResourceMark rm;
+ CodeBuffer cb(s->entry_point(), code_length);
+ MacroAssembler* masm = new MacroAssembler(&cb);
+
+#ifndef PRODUCT
+ if (CountCompiledCalls) {
+ __ lea(r10, ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
+ __ incrementw(Address(r10));
+ }
+#endif
+
+ // Entry arguments:
+ // rscratch2: Interface
+ // j_rarg0: Receiver
+
+ // Free registers (non-args) are r0 (interface), rmethod
+
+ // get receiver (need to skip return address on top of stack)
+
+ assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0");
+ // get receiver klass (also an implicit null-check)
+ address npe_addr = __ pc();
+
+ // Most registers are in use; we'll use r0, rmethod, r10, r11
+ __ load_klass(r10, j_rarg0);
+
+ Label throw_icce;
+
+ // Get Method* and entrypoint for compiler
+ __ lookup_interface_method(// inputs: rec. class, interface, itable index
+ r10, rscratch2, itable_index,
+ // outputs: method, scan temp. reg
+ rmethod, r11,
+ throw_icce);
+
+ // method (rmethod): Method*
+ // j_rarg0: receiver
+
+#ifdef ASSERT
+ if (DebugVtables) {
+ Label L2;
+ __ cbz(rmethod, L2);
+ __ ldr(rscratch1, Address(rmethod, Method::from_compiled_offset()));
+ __ cbnz(rscratch1, L2);
+ __ stop("compiler entrypoint is null");
+ __ bind(L2);
+ }
+#endif // ASSERT
+
+ // rmethod: Method*
+ // j_rarg0: receiver
+ address ame_addr = __ pc();
+ __ ldr(rscratch1, Address(rmethod, Method::from_compiled_offset()));
+ __ br(rscratch1);
+
+ __ bind(throw_icce);
+ __ far_jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
+
+ __ flush();
+
+ if (PrintMiscellaneous && (WizardMode || Verbose)) {
+ tty->print_cr("itable #%d at " PTR_FORMAT "[%d] left over: %d",
+ itable_index, p2i(s->entry_point()),
+ (int)(s->code_end() - s->entry_point()),
+ (int)(s->code_end() - __ pc()));
+ }
+ guarantee(__ pc() <= s->code_end(), "overflowed buffer");
+
+ s->set_exception_points(npe_addr, ame_addr);
+ return s;
+}
+
+
+int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
+ int size = DebugVtables ? 216 : 0;
+ if (CountCompiledCalls)
+ size += 6 * 4;
+ // FIXME
+ if (is_vtable_stub)
+ size += 52;
+ else
+ size += 104;
+ return size;
+
+ // In order to tune these parameters, run the JVM with VM options
+ // +PrintMiscellaneous and +WizardMode to see information about
+ // actual itable stubs. Run it with -Xmx31G -XX:+UseCompressedOops.
+ //
+ // If Universe::narrow_klass_base is nonzero, decoding a compressed
+ // class can take zeveral instructions. Run it with -Xmx31G
+ // -XX:+UseCompressedOops.
+ //
+ // The JVM98 app. _202_jess has a megamorphic interface call.
+ // The itable code looks like this:
+ // Decoding VtableStub itbl[1]@12
+ // ldr w10, [x1,#8]
+ // lsl x10, x10, #3
+ // ldr w11, [x10,#280]
+ // add x11, x10, x11, uxtx #3
+ // add x11, x11, #0x1b8
+ // ldr x12, [x11]
+ // cmp x9, x12
+ // b.eq success
+ // loop:
+ // cbz x12, throw_icce
+ // add x11, x11, #0x10
+ // ldr x12, [x11]
+ // cmp x9, x12
+ // b.ne loop
+ // success:
+ // ldr x11, [x11,#8]
+ // ldr x12, [x10,x11]
+ // ldr x8, [x12,#72]
+ // br x8
+ // throw_icce:
+ // b throw_ICCE_entry
+
+}
+
+int VtableStub::pd_code_alignment() { return 4; }