--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/cpu/s390/vtableStubs_s390.cpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,290 @@
+/*
+ * 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;
+}