241 lines
9.2 KiB
C++
241 lines
9.2 KiB
C++
/*
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* Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2012, 2018 SAP SE. 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.inline.hpp"
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#include "code/vtableStubs.hpp"
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#include "interp_masm_ppc.hpp"
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#include "memory/resourceArea.hpp"
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#include "oops/compiledICHolder.hpp"
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#include "oops/instanceKlass.hpp"
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#include "oops/klass.inline.hpp"
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#include "oops/klassVtable.hpp"
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#include "runtime/sharedRuntime.hpp"
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#include "vmreg_ppc.inline.hpp"
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#ifdef COMPILER2
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#include "opto/runtime.hpp"
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#endif
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#define __ masm->
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#ifndef PRODUCT
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extern "C" void bad_compiled_vtable_index(JavaThread* thread, oopDesc* receiver, int index);
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#endif
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// Used by compiler only; may use only caller saved, non-argument registers.
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VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
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// Read "A word on VtableStub sizing" in share/code/vtableStubs.hpp for details on stub sizing.
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const int stub_code_length = code_size_limit(true);
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VtableStub* s = new(stub_code_length) VtableStub(true, vtable_index);
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// Can be NULL if there is no free space in the code cache.
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if (s == NULL) {
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return NULL;
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}
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// Count unused bytes in instruction sequences of variable size.
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// We add them to the computed buffer size in order to avoid
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// overflow in subsequently generated stubs.
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address start_pc;
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int slop_bytes = 8; // just a two-instruction safety net
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int slop_delta = 0;
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ResourceMark rm;
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CodeBuffer cb(s->entry_point(), stub_code_length);
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MacroAssembler* masm = new MacroAssembler(&cb);
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#if (!defined(PRODUCT) && defined(COMPILER2))
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if (CountCompiledCalls) {
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start_pc = __ pc();
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int load_const_maxLen = 5*BytesPerInstWord; // load_const generates 5 instructions. Assume that as max size for laod_const_optimized
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int offs = __ load_const_optimized(R11_scratch1, SharedRuntime::nof_megamorphic_calls_addr(), R12_scratch2, true);
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slop_delta = load_const_maxLen - (__ pc() - start_pc);
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slop_bytes += slop_delta;
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assert(slop_delta >= 0, "negative slop(%d) encountered, adjust code size estimate!", slop_delta);
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__ lwz(R12_scratch2, offs, R11_scratch1);
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__ addi(R12_scratch2, R12_scratch2, 1);
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__ stw(R12_scratch2, offs, R11_scratch1);
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}
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#endif
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assert(VtableStub::receiver_location() == R3_ARG1->as_VMReg(), "receiver expected in R3_ARG1");
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const Register rcvr_klass = R11_scratch1;
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address npe_addr = __ pc(); // npe = null pointer exception
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// check if we must do an explicit check (implicit checks disabled, offset too large).
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__ null_check(R3, oopDesc::klass_offset_in_bytes(), /*implicit only*/NULL);
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// Get receiver klass.
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__ load_klass(rcvr_klass, R3);
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#ifndef PRODUCT
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if (DebugVtables) {
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Label L;
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// Check offset vs vtable length.
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const Register vtable_len = R12_scratch2;
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__ lwz(vtable_len, in_bytes(Klass::vtable_length_offset()), rcvr_klass);
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__ cmpwi(CCR0, vtable_len, vtable_index*vtableEntry::size());
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__ bge(CCR0, L);
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__ li(R12_scratch2, vtable_index);
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__ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), R3_ARG1, R12_scratch2, false);
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__ bind(L);
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}
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#endif
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int entry_offset = in_bytes(Klass::vtable_start_offset()) +
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vtable_index*vtableEntry::size_in_bytes();
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int v_off = entry_offset + vtableEntry::method_offset_in_bytes();
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__ ld(R19_method, (RegisterOrConstant)v_off, rcvr_klass);
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#ifndef PRODUCT
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if (DebugVtables) {
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Label L;
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__ cmpdi(CCR0, R19_method, 0);
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__ bne(CCR0, L);
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__ stop("Vtable entry is ZERO", 102);
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__ bind(L);
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}
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#endif
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address ame_addr = __ pc(); // ame = abstract method error
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// if the vtable entry is null, the method is abstract
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// NOTE: for vtable dispatches, the vtable entry will never be null.
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__ null_check(R19_method, in_bytes(Method::from_compiled_offset()), /*implicit only*/NULL);
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__ ld(R12_scratch2, in_bytes(Method::from_compiled_offset()), R19_method);
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__ mtctr(R12_scratch2);
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__ bctr();
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masm->flush();
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bookkeeping(masm, tty, s, npe_addr, ame_addr, true, vtable_index, slop_bytes, 0);
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return s;
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}
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VtableStub* VtableStubs::create_itable_stub(int itable_index) {
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// Read "A word on VtableStub sizing" in share/code/vtableStubs.hpp for details on stub sizing.
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const int stub_code_length = code_size_limit(false);
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VtableStub* s = new(stub_code_length) VtableStub(false, itable_index);
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// Can be NULL if there is no free space in the code cache.
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if (s == NULL) {
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return NULL;
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}
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// Count unused bytes in instruction sequences of variable size.
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// We add them to the computed buffer size in order to avoid
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// overflow in subsequently generated stubs.
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address start_pc;
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int slop_bytes = 8; // just a two-instruction safety net
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int slop_delta = 0;
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ResourceMark rm;
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CodeBuffer cb(s->entry_point(), stub_code_length);
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MacroAssembler* masm = new MacroAssembler(&cb);
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int load_const_maxLen = 5*BytesPerInstWord; // load_const generates 5 instructions. Assume that as max size for laod_const_optimized
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#if (!defined(PRODUCT) && defined(COMPILER2))
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if (CountCompiledCalls) {
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start_pc = __ pc();
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int offs = __ load_const_optimized(R11_scratch1, SharedRuntime::nof_megamorphic_calls_addr(), R12_scratch2, true);
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slop_delta = load_const_maxLen - (__ pc() - start_pc);
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slop_bytes += slop_delta;
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assert(slop_delta >= 0, "negative slop(%d) encountered, adjust code size estimate!", slop_delta);
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__ lwz(R12_scratch2, offs, R11_scratch1);
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__ addi(R12_scratch2, R12_scratch2, 1);
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__ stw(R12_scratch2, offs, R11_scratch1);
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}
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#endif
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assert(VtableStub::receiver_location() == R3_ARG1->as_VMReg(), "receiver expected in R3_ARG1");
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// Entry arguments:
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// R19_method: Interface
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// R3_ARG1: Receiver
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Label L_no_such_interface;
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const Register rcvr_klass = R11_scratch1,
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interface = R12_scratch2,
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tmp1 = R21_tmp1,
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tmp2 = R22_tmp2;
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address npe_addr = __ pc(); // npe = null pointer exception
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__ null_check(R3_ARG1, oopDesc::klass_offset_in_bytes(), /*implicit only*/NULL);
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__ load_klass(rcvr_klass, R3_ARG1);
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// Receiver subtype check against REFC.
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__ ld(interface, CompiledICHolder::holder_klass_offset(), R19_method);
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__ lookup_interface_method(rcvr_klass, interface, noreg,
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R0, tmp1, tmp2,
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L_no_such_interface, /*return_method=*/ false);
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// Get Method* and entrypoint for compiler
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__ ld(interface, CompiledICHolder::holder_metadata_offset(), R19_method);
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__ lookup_interface_method(rcvr_klass, interface, itable_index,
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R19_method, tmp1, tmp2,
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L_no_such_interface, /*return_method=*/ true);
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#ifndef PRODUCT
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if (DebugVtables) {
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Label ok;
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__ cmpd(CCR0, R19_method, 0);
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__ bne(CCR0, ok);
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__ stop("method is null", 103);
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__ bind(ok);
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}
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#endif
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// If the vtable entry is null, the method is abstract.
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address ame_addr = __ pc(); // ame = abstract method error
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// Must do an explicit check if implicit checks are disabled.
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__ null_check(R19_method, in_bytes(Method::from_compiled_offset()), &L_no_such_interface);
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__ ld(R12_scratch2, in_bytes(Method::from_compiled_offset()), R19_method);
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__ mtctr(R12_scratch2);
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__ bctr();
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// Handle IncompatibleClassChangeError in itable stubs.
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// More detailed error message.
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// We force resolving of the call site by jumping to the "handle
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// wrong method" stub, and so let the interpreter runtime do all the
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// dirty work.
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__ bind(L_no_such_interface);
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start_pc = __ pc();
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__ load_const_optimized(R11_scratch1, SharedRuntime::get_handle_wrong_method_stub(), R12_scratch2);
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slop_delta = load_const_maxLen - (__ pc() - start_pc);
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slop_bytes += slop_delta;
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assert(slop_delta >= 0, "negative slop(%d) encountered, adjust code size estimate!", slop_delta);
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__ mtctr(R11_scratch1);
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__ bctr();
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masm->flush();
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bookkeeping(masm, tty, s, npe_addr, ame_addr, false, itable_index, slop_bytes, 0);
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return s;
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}
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int VtableStub::pd_code_alignment() {
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// Power cache line size is 128 bytes, but we want to limit alignment loss.
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const unsigned int icache_line_size = 32;
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return icache_line_size;
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}
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