| /* |
| * Copyright (c) 2008, 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. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "asm/assembler.hpp" |
| #include "asm/macroAssembler.inline.hpp" |
| #include "assembler_arm.inline.hpp" |
| #include "code/vtableStubs.hpp" |
| #include "interp_masm_arm.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "oops/compiledICHolder.hpp" |
| #include "oops/instanceKlass.hpp" |
| #include "oops/klassVtable.hpp" |
| #include "runtime/sharedRuntime.hpp" |
| #include "vmreg_arm.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) { |
| // Read "A word on VtableStub sizing" in share/code/vtableStubs.hpp for details on stub sizing. |
| const int stub_code_length = code_size_limit(true); |
| VtableStub* s = new(stub_code_length) VtableStub(true, vtable_index); |
| // Can be NULL if there is no free space in the code cache. |
| if (s == NULL) { |
| return NULL; |
| } |
| |
| // Count unused bytes in instruction sequences of variable size. |
| // We add them to the computed buffer size in order to avoid |
| // overflow in subsequently generated stubs. |
| address start_pc; |
| int slop_bytes = 0; |
| int slop_delta = 0; |
| |
| ResourceMark rm; |
| CodeBuffer cb(s->entry_point(), stub_code_length); |
| MacroAssembler* masm = new MacroAssembler(&cb); |
| |
| #if (!defined(PRODUCT) && defined(COMPILER2)) |
| if (CountCompiledCalls) { |
| // Implementation required? |
| } |
| #endif |
| |
| assert(VtableStub::receiver_location() == R0->as_VMReg(), "receiver expected in R0"); |
| |
| const Register tmp = Rtemp; // Rtemp OK, should be free at call sites |
| |
| address npe_addr = __ pc(); |
| __ load_klass(tmp, R0); |
| |
| #ifndef PRODUCT |
| if (DebugVtables) { |
| // Implementation required? |
| } |
| #endif |
| |
| start_pc = __ pc(); |
| { // lookup virtual method |
| int entry_offset = in_bytes(Klass::vtable_start_offset()) + vtable_index * vtableEntry::size_in_bytes(); |
| int method_offset = vtableEntry::method_offset_in_bytes() + entry_offset; |
| |
| assert ((method_offset & (wordSize - 1)) == 0, "offset should be aligned"); |
| int offset_mask = AARCH64_ONLY(0xfff << LogBytesPerWord) NOT_AARCH64(0xfff); |
| if (method_offset & ~offset_mask) { |
| __ add(tmp, tmp, method_offset & ~offset_mask); |
| } |
| __ ldr(Rmethod, Address(tmp, method_offset & offset_mask)); |
| } |
| slop_delta = 8 - (int)(__ pc() - start_pc); |
| slop_bytes += slop_delta; |
| assert(slop_delta >= 0, "negative slop(%d) encountered, adjust code size estimate!", slop_delta); |
| |
| #ifndef PRODUCT |
| if (DebugVtables) { |
| // Implementation required? |
| } |
| #endif |
| |
| address ame_addr = __ pc(); |
| #ifdef AARCH64 |
| __ ldr(tmp, Address(Rmethod, Method::from_compiled_offset())); |
| __ br(tmp); |
| #else |
| __ ldr(PC, Address(Rmethod, Method::from_compiled_offset())); |
| #endif // AARCH64 |
| |
| masm->flush(); |
| bookkeeping(masm, tty, s, npe_addr, ame_addr, true, vtable_index, slop_bytes, 0); |
| |
| return s; |
| } |
| |
| VtableStub* VtableStubs::create_itable_stub(int itable_index) { |
| // Read "A word on VtableStub sizing" in share/code/vtableStubs.hpp for details on stub sizing. |
| const int stub_code_length = code_size_limit(false); |
| VtableStub* s = new(stub_code_length) VtableStub(false, itable_index); |
| // Can be NULL if there is no free space in the code cache. |
| if (s == NULL) { |
| return NULL; |
| } |
| // Count unused bytes in instruction sequences of variable size. |
| // We add them to the computed buffer size in order to avoid |
| // overflow in subsequently generated stubs. |
| address start_pc; |
| int slop_bytes = 0; |
| int slop_delta = 0; |
| |
| ResourceMark rm; |
| CodeBuffer cb(s->entry_point(), stub_code_length); |
| MacroAssembler* masm = new MacroAssembler(&cb); |
| |
| #if (!defined(PRODUCT) && defined(COMPILER2)) |
| if (CountCompiledCalls) { |
| // Implementation required? |
| } |
| #endif |
| |
| assert(VtableStub::receiver_location() == R0->as_VMReg(), "receiver expected in R0"); |
| |
| // R0-R3 / R0-R7 registers hold the arguments and cannot be spoiled |
| const Register Rclass = AARCH64_ONLY(R9) NOT_AARCH64(R4); |
| const Register Rintf = AARCH64_ONLY(R10) NOT_AARCH64(R5); |
| const Register Rscan = AARCH64_ONLY(R11) NOT_AARCH64(R6); |
| |
| Label L_no_such_interface; |
| |
| assert_different_registers(Ricklass, Rclass, Rintf, Rscan, Rtemp); |
| |
| start_pc = __ pc(); |
| |
| // get receiver klass (also an implicit null-check) |
| address npe_addr = __ pc(); |
| __ load_klass(Rclass, R0); |
| |
| // Receiver subtype check against REFC. |
| __ ldr(Rintf, Address(Ricklass, CompiledICHolder::holder_klass_offset())); |
| __ lookup_interface_method(// inputs: rec. class, interface, itable index |
| Rclass, Rintf, noreg, |
| // outputs: temp reg1, temp reg2 |
| noreg, Rscan, Rtemp, |
| L_no_such_interface); |
| |
| const ptrdiff_t typecheckSize = __ pc() - start_pc; |
| start_pc = __ pc(); |
| |
| // Get Method* and entry point for compiler |
| __ ldr(Rintf, Address(Ricklass, CompiledICHolder::holder_metadata_offset())); |
| __ lookup_interface_method(// inputs: rec. class, interface, itable index |
| Rclass, Rintf, itable_index, |
| // outputs: temp reg1, temp reg2, temp reg3 |
| Rmethod, Rscan, Rtemp, |
| L_no_such_interface); |
| |
| const ptrdiff_t lookupSize = __ pc() - start_pc; |
| |
| // Reduce "estimate" such that "padding" does not drop below 8. |
| const ptrdiff_t estimate = 140; |
| const ptrdiff_t codesize = typecheckSize + lookupSize; |
| slop_delta = (int)(estimate - codesize); |
| slop_bytes += slop_delta; |
| assert(slop_delta >= 0, "itable #%d: Code size estimate (%d) for lookup_interface_method too small, required: %d", itable_index, (int)estimate, (int)codesize); |
| |
| #ifndef PRODUCT |
| if (DebugVtables) { |
| // Implementation required? |
| } |
| #endif |
| |
| address ame_addr = __ pc(); |
| |
| #ifdef AARCH64 |
| __ ldr(Rtemp, Address(Rmethod, Method::from_compiled_offset())); |
| __ br(Rtemp); |
| #else |
| __ ldr(PC, Address(Rmethod, Method::from_compiled_offset())); |
| #endif // AARCH64 |
| |
| __ bind(L_no_such_interface); |
| // Handle IncompatibleClassChangeError in itable stubs. |
| // More detailed error message. |
| // We force resolving of the call site by jumping to the "handle |
| // wrong method" stub, and so let the interpreter runtime do all the |
| // dirty work. |
| assert(SharedRuntime::get_handle_wrong_method_stub() != NULL, "check initialization order"); |
| __ jump(SharedRuntime::get_handle_wrong_method_stub(), relocInfo::runtime_call_type, Rtemp); |
| |
| masm->flush(); |
| bookkeeping(masm, tty, s, npe_addr, ame_addr, false, itable_index, slop_bytes, 0); |
| |
| return s; |
| } |
| |
| int VtableStub::pd_code_alignment() { |
| // ARM32 cache line size is not an architected constant. We just align on word size. |
| const unsigned int icache_line_size = wordSize; |
| return icache_line_size; |
| } |