| /* |
| * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
| * Copyright (c) 2016 SAP SE. 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.inline.hpp" |
| #include "code/vtableStubs.hpp" |
| #include "interp_masm_s390.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "oops/instanceKlass.hpp" |
| #include "oops/klassVtable.hpp" |
| #include "runtime/sharedRuntime.hpp" |
| #include "vmreg_s390.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 |
| |
| // Used by compiler only; may use only caller saved, non-argument registers. |
| VtableStub* VtableStubs::create_vtable_stub(int vtable_index) { |
| |
| const int code_length = VtableStub::pd_code_size_limit(true); |
| VtableStub *s = new(code_length) VtableStub(true, vtable_index); |
| if (s == NULL) { // Indicates OOM In the code cache. |
| return NULL; |
| } |
| |
| ResourceMark rm; |
| CodeBuffer cb(s->entry_point(), code_length); |
| MacroAssembler *masm = new MacroAssembler(&cb); |
| address start_pc; |
| int padding_bytes = 0; |
| |
| #if (!defined(PRODUCT) && defined(COMPILER2)) |
| if (CountCompiledCalls) { |
| // Count unused bytes |
| // worst case actual size |
| padding_bytes += __ load_const_size() - __ load_const_optimized_rtn_len(Z_R1_scratch, (long)SharedRuntime::nof_megamorphic_calls_addr(), true); |
| |
| // Use generic emitter for direct memory increment. |
| // Abuse Z_method as scratch register for generic emitter. |
| // It is loaded further down anyway before it is first used. |
| __ add2mem_32(Address(Z_R1_scratch), 1, Z_method); |
| } |
| #endif |
| |
| assert(VtableStub::receiver_location() == Z_R2->as_VMReg(), "receiver expected in Z_ARG1"); |
| |
| // Get receiver klass. |
| // Must do an explicit check if implicit checks are disabled. |
| address npe_addr = __ pc(); // npe == NULL ptr exception |
| __ null_check(Z_ARG1, Z_R1_scratch, oopDesc::klass_offset_in_bytes()); |
| const Register rcvr_klass = Z_R1_scratch; |
| __ load_klass(rcvr_klass, Z_ARG1); |
| |
| // Set method (in case of interpreted method), and destination address. |
| int entry_offset = in_bytes(Klass::vtable_start_offset()) + |
| vtable_index * vtableEntry::size_in_bytes(); |
| |
| #ifndef PRODUCT |
| if (DebugVtables) { |
| Label L; |
| // Check offset vs vtable length. |
| const Register vtable_idx = Z_R0_scratch; |
| |
| // Count unused bytes. |
| // worst case actual size |
| padding_bytes += __ load_const_size() - __ load_const_optimized_rtn_len(vtable_idx, vtable_index*vtableEntry::size_in_bytes(), true); |
| |
| assert(Immediate::is_uimm12(in_bytes(Klass::vtable_length_offset())), "disp to large"); |
| __ z_cl(vtable_idx, in_bytes(Klass::vtable_length_offset()), rcvr_klass); |
| __ z_brl(L); |
| __ z_lghi(Z_ARG3, vtable_index); // Debug code, don't optimize. |
| __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), Z_ARG1, Z_ARG3, false); |
| // Count unused bytes (assume worst case here). |
| padding_bytes += 12; |
| __ bind(L); |
| } |
| #endif |
| |
| int v_off = entry_offset + vtableEntry::method_offset_in_bytes(); |
| |
| // Duplicate safety code from enc_class Java_Dynamic_Call_dynTOC. |
| if (Displacement::is_validDisp(v_off)) { |
| __ z_lg(Z_method/*method oop*/, v_off, rcvr_klass/*class oop*/); |
| // Account for the load_const in the else path. |
| padding_bytes += __ load_const_size(); |
| } else { |
| // Worse case, offset does not fit in displacement field. |
| __ load_const(Z_method, v_off); // Z_method temporarily holds the offset value. |
| __ z_lg(Z_method/*method oop*/, 0, Z_method/*method offset*/, rcvr_klass/*class oop*/); |
| } |
| |
| #ifndef PRODUCT |
| if (DebugVtables) { |
| Label L; |
| __ z_ltgr(Z_method, Z_method); |
| __ z_brne(L); |
| __ stop("Vtable entry is ZERO",102); |
| __ bind(L); |
| } |
| #endif |
| |
| address ame_addr = __ pc(); // ame = abstract method error |
| |
| // Must do an explicit check if implicit checks are disabled. |
| __ null_check(Z_method, Z_R1_scratch, in_bytes(Method::from_compiled_offset())); |
| __ z_lg(Z_R1_scratch, in_bytes(Method::from_compiled_offset()), Z_method); |
| __ z_br(Z_R1_scratch); |
| |
| masm->flush(); |
| |
| s->set_exception_points(npe_addr, ame_addr); |
| |
| return s; |
| } |
| |
| VtableStub* VtableStubs::create_itable_stub(int vtable_index) { |
| const int code_length = VtableStub::pd_code_size_limit(false); |
| VtableStub *s = new(code_length) VtableStub(false, vtable_index); |
| if (s == NULL) { // Indicates OOM in the code cache. |
| return NULL; |
| } |
| |
| ResourceMark rm; |
| CodeBuffer cb(s->entry_point(), code_length); |
| MacroAssembler *masm = new MacroAssembler(&cb); |
| address start_pc; |
| int padding_bytes = 0; |
| |
| #if (!defined(PRODUCT) && defined(COMPILER2)) |
| if (CountCompiledCalls) { |
| // Count unused bytes |
| // worst case actual size |
| padding_bytes += __ load_const_size() - __ load_const_optimized_rtn_len(Z_R1_scratch, (long)SharedRuntime::nof_megamorphic_calls_addr(), true); |
| |
| // Use generic emitter for direct memory increment. |
| // Use Z_tmp_1 as scratch register for generic emitter. |
| __ add2mem_32((Z_R1_scratch), 1, Z_tmp_1); |
| } |
| #endif |
| |
| assert(VtableStub::receiver_location() == Z_R2->as_VMReg(), "receiver expected in Z_ARG1"); |
| |
| // Entry arguments: |
| // Z_method: Interface |
| // Z_ARG1: Receiver |
| const Register rcvr_klass = Z_tmp_1; // Used to compute itable_entry_addr. |
| // Use extra reg to avoid re-load. |
| const Register vtable_len = Z_tmp_2; // Used to compute itable_entry_addr. |
| const Register itable_entry_addr = Z_R1_scratch; |
| const Register itable_interface = Z_R0_scratch; |
| |
| // Get receiver klass. |
| // Must do an explicit check if implicit checks are disabled. |
| address npe_addr = __ pc(); // npe == NULL ptr exception |
| __ null_check(Z_ARG1, Z_R1_scratch, oopDesc::klass_offset_in_bytes()); |
| __ load_klass(rcvr_klass, Z_ARG1); |
| |
| // Load start of itable entries into itable_entry. |
| __ z_llgf(vtable_len, Address(rcvr_klass, Klass::vtable_length_offset())); |
| __ z_sllg(vtable_len, vtable_len, exact_log2(vtableEntry::size_in_bytes())); |
| |
| // Loop over all itable entries until desired interfaceOop(Rinterface) found. |
| const int vtable_base_offset = in_bytes(Klass::vtable_start_offset()); |
| // Count unused bytes. |
| start_pc = __ pc(); |
| __ add2reg_with_index(itable_entry_addr, vtable_base_offset + itableOffsetEntry::interface_offset_in_bytes(), rcvr_klass, vtable_len); |
| padding_bytes += 20 - (__ pc() - start_pc); |
| |
| const int itable_offset_search_inc = itableOffsetEntry::size() * wordSize; |
| Label search; |
| __ bind(search); |
| |
| // Handle IncompatibleClassChangeError in itable stubs. |
| // If the entry is NULL then we've reached the end of the table |
| // without finding the expected interface, so throw an exception. |
| NearLabel throw_icce; |
| __ load_and_test_long(itable_interface, Address(itable_entry_addr)); |
| __ z_bre(throw_icce); // Throw the exception out-of-line. |
| // Count unused bytes. |
| start_pc = __ pc(); |
| __ add2reg(itable_entry_addr, itable_offset_search_inc); |
| padding_bytes += 20 - (__ pc() - start_pc); |
| __ z_cgr(itable_interface, Z_method); |
| __ z_brne(search); |
| |
| // Entry found. Itable_entry_addr points to the subsequent entry (itable_offset_search_inc too far). |
| // Get offset of vtable for interface. |
| |
| const Register vtable_offset = Z_R1_scratch; |
| const Register itable_method = rcvr_klass; // Calculated before. |
| |
| const int vtable_offset_offset = (itableOffsetEntry::offset_offset_in_bytes() - |
| itableOffsetEntry::interface_offset_in_bytes()) - |
| itable_offset_search_inc; |
| __ z_llgf(vtable_offset, vtable_offset_offset, itable_entry_addr); |
| |
| // Compute itableMethodEntry and get method and entry point for compiler. |
| const int method_offset = (itableMethodEntry::size() * wordSize * vtable_index) + |
| itableMethodEntry::method_offset_in_bytes(); |
| |
| __ z_lg(Z_method, method_offset, vtable_offset, itable_method); |
| |
| #ifndef PRODUCT |
| if (DebugVtables) { |
| Label ok1; |
| __ z_ltgr(Z_method, Z_method); |
| __ z_brne(ok1); |
| __ stop("method is null",103); |
| __ bind(ok1); |
| } |
| #endif |
| |
| address ame_addr = __ pc(); |
| // Must do an explicit check if implicit checks are disabled. |
| if (!ImplicitNullChecks) { |
| __ compare64_and_branch(Z_method, (intptr_t) 0, Assembler::bcondEqual, throw_icce); |
| } |
| __ z_lg(Z_R1_scratch, in_bytes(Method::from_compiled_offset()), Z_method); |
| __ z_br(Z_R1_scratch); |
| |
| // Handle IncompatibleClassChangeError in itable stubs. |
| __ bind(throw_icce); |
| // Count unused bytes |
| // worst case actual size |
| // 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. |
| padding_bytes += __ load_const_size() - __ load_const_optimized_rtn_len(Z_R1_scratch, (long)SharedRuntime::get_handle_wrong_method_stub(), true); |
| __ z_br(Z_R1_scratch); |
| |
| masm->flush(); |
| |
| s->set_exception_points(npe_addr, ame_addr); |
| return s; |
| } |
| |
| // 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. |
| int VtableStub::pd_code_size_limit(bool is_vtable_stub) { |
| int size = DebugVtables ? 216 : 0; |
| if (CountCompiledCalls) { |
| size += 6 * 4; |
| } |
| if (is_vtable_stub) { |
| size += 52; |
| } else { |
| size += 104; |
| } |
| if (Universe::narrow_klass_base() != NULL) { |
| size += 16; // A guess. |
| } |
| return size; |
| } |
| |
| int VtableStub::pd_code_alignment() { |
| const unsigned int icache_line_size = 32; |
| return icache_line_size; |
| } |