1 /*
2 * Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2016, 2017 SAP SE. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "asm/macroAssembler.inline.hpp"
28 #include "code/vtableStubs.hpp"
29 #include "interp_masm_s390.hpp"
30 #include "memory/resourceArea.hpp"
31 #include "oops/compiledICHolder.hpp"
32 #include "oops/instanceKlass.hpp"
33 #include "oops/klassVtable.hpp"
34 #include "runtime/sharedRuntime.hpp"
35 #include "vmreg_s390.inline.hpp"
36 #ifdef COMPILER2
37 #include "opto/runtime.hpp"
38 #endif
39
40 // Machine-dependent part of VtableStubs: create vtableStub of correct
41 // size and initialize its code.
42
43 #define __ masm->
44
45 #ifndef PRODUCT
46 extern "C" void bad_compiled_vtable_index(JavaThread* thread, oop receiver, int index);
47 #endif
48
49 // Used by compiler only; may use only caller saved, non-argument registers.
50 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
51
52 const int code_length = VtableStub::pd_code_size_limit(true);
53 VtableStub *s = new(code_length) VtableStub(true, vtable_index);
54 if (s == NULL) { // Indicates OOM In the code cache.
55 return NULL;
56 }
57
58 ResourceMark rm;
59 CodeBuffer cb(s->entry_point(), code_length);
60 MacroAssembler *masm = new MacroAssembler(&cb);
61
62 #if (!defined(PRODUCT) && defined(COMPILER2))
63 if (CountCompiledCalls) {
64 // Count unused bytes
65 __ load_const_optimized_rtn_len(Z_R1_scratch, (long)SharedRuntime::nof_megamorphic_calls_addr(), true);
66
67 // Use generic emitter for direct memory increment.
68 // Abuse Z_method as scratch register for generic emitter.
69 // It is loaded further down anyway before it is first used.
70 __ add2mem_32(Address(Z_R1_scratch), 1, Z_method);
71 }
72 #endif
73
74 assert(VtableStub::receiver_location() == Z_R2->as_VMReg(), "receiver expected in Z_ARG1");
75
76 // Get receiver klass.
77 // Must do an explicit check if implicit checks are disabled.
78 address npe_addr = __ pc(); // npe == NULL ptr exception
79 __ null_check(Z_ARG1, Z_R1_scratch, oopDesc::klass_offset_in_bytes());
80 const Register rcvr_klass = Z_R1_scratch;
81 __ load_klass(rcvr_klass, Z_ARG1);
82
83 // Set method (in case of interpreted method), and destination address.
84 int entry_offset = in_bytes(Klass::vtable_start_offset()) +
85 vtable_index * vtableEntry::size_in_bytes();
86
87 #ifndef PRODUCT
88 if (DebugVtables) {
89 Label L;
90 // Check offset vs vtable length.
91 const Register vtable_idx = Z_R0_scratch;
92
93 __ load_const_optimized_rtn_len(vtable_idx, vtable_index*vtableEntry::size_in_bytes(), true);
94
95 assert(Immediate::is_uimm12(in_bytes(Klass::vtable_length_offset())), "disp to large");
96 __ z_cl(vtable_idx, in_bytes(Klass::vtable_length_offset()), rcvr_klass);
97 __ z_brl(L);
98 __ z_lghi(Z_ARG3, vtable_index); // Debug code, don't optimize.
99 __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), Z_ARG1, Z_ARG3, false);
100 __ bind(L);
101 }
102 #endif
103
104 int v_off = entry_offset + vtableEntry::method_offset_in_bytes();
105
106 // Duplicate safety code from enc_class Java_Dynamic_Call_dynTOC.
107 if (Displacement::is_validDisp(v_off)) {
108 __ z_lg(Z_method/*method oop*/, v_off, rcvr_klass/*class oop*/);
109 } else {
110 // Worse case, offset does not fit in displacement field.
111 __ load_const(Z_method, v_off); // Z_method temporarily holds the offset value.
112 __ z_lg(Z_method/*method oop*/, 0, Z_method/*method offset*/, rcvr_klass/*class oop*/);
113 }
114
115 #ifndef PRODUCT
116 if (DebugVtables) {
117 Label L;
118 __ z_ltgr(Z_method, Z_method);
119 __ z_brne(L);
120 __ stop("Vtable entry is ZERO",102);
121 __ bind(L);
122 }
123 #endif
124
125 address ame_addr = __ pc(); // ame = abstract method error
126
127 // Must do an explicit check if implicit checks are disabled.
128 __ null_check(Z_method, Z_R1_scratch, in_bytes(Method::from_compiled_offset()));
129 __ z_lg(Z_R1_scratch, in_bytes(Method::from_compiled_offset()), Z_method);
130 __ z_br(Z_R1_scratch);
131
132 masm->flush();
133
134 s->set_exception_points(npe_addr, ame_addr);
135
136 return s;
137 }
138
139 VtableStub* VtableStubs::create_itable_stub(int itable_index) {
140 const int code_length = VtableStub::pd_code_size_limit(false);
141 VtableStub *s = new(code_length) VtableStub(false, itable_index);
142 if (s == NULL) { // Indicates OOM in the code cache.
143 return NULL;
144 }
145
146 ResourceMark rm;
147 CodeBuffer cb(s->entry_point(), code_length);
148 MacroAssembler *masm = new MacroAssembler(&cb);
149
150 #if (!defined(PRODUCT) && defined(COMPILER2))
151 if (CountCompiledCalls) {
152 __ load_const_optimized_rtn_len(Z_R1_scratch, (long)SharedRuntime::nof_megamorphic_calls_addr(), true);
153
154 // Use generic emitter for direct memory increment.
155 // Use Z_tmp_1 as scratch register for generic emitter.
156 __ add2mem_32((Z_R1_scratch), 1, Z_tmp_1);
157 }
158 #endif
159
160 assert(VtableStub::receiver_location() == Z_R2->as_VMReg(), "receiver expected in Z_ARG1");
161
162 // Entry arguments:
163 // Z_method: Interface
164 // Z_ARG1: Receiver
165 NearLabel no_such_interface;
166 const Register rcvr_klass = Z_tmp_1,
167 interface = Z_tmp_2;
168
169 // Get receiver klass.
170 // Must do an explicit check if implicit checks are disabled.
171 address npe_addr = __ pc(); // npe == NULL ptr exception
172 __ null_check(Z_ARG1, Z_R1_scratch, oopDesc::klass_offset_in_bytes());
173 __ load_klass(rcvr_klass, Z_ARG1);
174
175 // Receiver subtype check against REFC.
176 __ z_lg(interface, Address(Z_method, CompiledICHolder::holder_klass_offset()));
177 __ lookup_interface_method(rcvr_klass, interface, noreg,
178 noreg, Z_R1, no_such_interface, /*return_method=*/ false);
179
180 // Get Method* and entrypoint for compiler
181 __ z_lg(interface, Address(Z_method, CompiledICHolder::holder_metadata_offset()));
182 __ lookup_interface_method(rcvr_klass, interface, itable_index,
183 Z_method, Z_R1, no_such_interface, /*return_method=*/ true);
184
185 #ifndef PRODUCT
186 if (DebugVtables) {
187 Label ok1;
188 __ z_ltgr(Z_method, Z_method);
189 __ z_brne(ok1);
190 __ stop("method is null",103);
191 __ bind(ok1);
192 }
193 #endif
194
195 address ame_addr = __ pc();
196 // Must do an explicit check if implicit checks are disabled.
197 if (!ImplicitNullChecks) {
198 __ compare64_and_branch(Z_method, (intptr_t) 0, Assembler::bcondEqual, no_such_interface);
199 }
200 __ z_lg(Z_R1_scratch, in_bytes(Method::from_compiled_offset()), Z_method);
201 __ z_br(Z_R1_scratch);
202
203 __ bind(no_such_interface);
204 // Handle IncompatibleClassChangeError in itable stubs.
205 // More detailed error message.
206 // We force resolving of the call site by jumping to the "handle
207 // wrong method" stub, and so let the interpreter runtime do all the
208 // dirty work.
209 __ load_const_optimized_rtn_len(Z_R1_scratch, (long)SharedRuntime::get_handle_wrong_method_stub(), true);
210 __ z_br(Z_R1_scratch);
211
212 masm->flush();
213
214 s->set_exception_points(npe_addr, ame_addr);
215 return s;
216 }
217
218 // In order to tune these parameters, run the JVM with VM options
219 // +PrintMiscellaneous and +WizardMode to see information about
220 // actual itable stubs. Run it with -Xmx31G -XX:+UseCompressedOops.
221 int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
222 int size = DebugVtables ? 216 : 0;
223 if (CountCompiledCalls) {
224 size += 6 * 4;
225 }
226 size += is_vtable_stub ? 36 : 140;
227 if (UseCompressedClassPointers) {
228 size += MacroAssembler::instr_size_for_decode_klass_not_null();
229 }
230 if (!ImplicitNullChecks) {
231 size += 36;
232 }
233 return size;
234 }
235
236 int VtableStub::pd_code_alignment() {
237 const unsigned int icache_line_size = 32;
238 return icache_line_size;
239 }