| /* |
| * 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; } |