1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2018 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_ppc.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_ppc.inline.hpp"
36 #ifdef COMPILER2
37 #include "opto/runtime.hpp"
38 #endif
39
40 #define __ masm->
41
42 #ifdef PRODUCT
43 #define BLOCK_COMMENT(str) // nothing
44 #else
45 #define BLOCK_COMMENT(str) __ block_comment(str)
46 #endif
47 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
48
49 #ifndef PRODUCT
50 extern "C" void bad_compiled_vtable_index(JavaThread* thread, oopDesc* receiver, int index);
51 #endif
52
53 // Used by compiler only; may use only caller saved, non-argument
54 // registers.
55 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
56 // PPC port: use fixed size.
57 const int code_length = VtableStub::pd_code_size_limit(true);
58 VtableStub* s = new (code_length) VtableStub(true, vtable_index);
59
60 // Can be NULL if there is no free space in the code cache.
61 if (s == NULL) {
62 return NULL;
63 }
64
65 ResourceMark rm;
66 CodeBuffer cb(s->entry_point(), code_length);
67 MacroAssembler* masm = new MacroAssembler(&cb);
68
69 #ifndef PRODUCT
70 if (CountCompiledCalls) {
71 int offs = __ load_const_optimized(R11_scratch1, SharedRuntime::nof_megamorphic_calls_addr(), R12_scratch2, true);
72 __ lwz(R12_scratch2, offs, R11_scratch1);
73 __ addi(R12_scratch2, R12_scratch2, 1);
74 __ stw(R12_scratch2, offs, R11_scratch1);
75 }
76 #endif
77
78 assert(VtableStub::receiver_location() == R3_ARG1->as_VMReg(), "receiver expected in R3_ARG1");
79
80 // Get receiver klass.
81 const Register rcvr_klass = R11_scratch1;
82
83 // We might implicit NULL fault here.
84 address npe_addr = __ pc(); // npe = null pointer exception
85 __ null_check(R3, oopDesc::klass_offset_in_bytes(), /*implicit only*/NULL);
86 __ load_klass(rcvr_klass, R3);
87
88 // Set method (in case of interpreted method), and destination address.
89 int entry_offset = in_bytes(Klass::vtable_start_offset()) + vtable_index*vtableEntry::size_in_bytes();
90
91 #ifndef PRODUCT
92 if (DebugVtables) {
93 Label L;
94 // Check offset vs vtable length.
95 const Register vtable_len = R12_scratch2;
96 __ lwz(vtable_len, in_bytes(Klass::vtable_length_offset()), rcvr_klass);
97 __ cmpwi(CCR0, vtable_len, vtable_index*vtableEntry::size());
98 __ bge(CCR0, L);
99 __ li(R12_scratch2, vtable_index);
100 __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), R3_ARG1, R12_scratch2, false);
101 __ bind(L);
102 }
103 #endif
104
105 int v_off = entry_offset + vtableEntry::method_offset_in_bytes();
106
107 __ ld(R19_method, (RegisterOrConstant)v_off, rcvr_klass);
108
109 #ifndef PRODUCT
110 if (DebugVtables) {
111 Label L;
112 __ cmpdi(CCR0, R19_method, 0);
113 __ bne(CCR0, L);
114 __ stop("Vtable entry is ZERO", 102);
115 __ bind(L);
116 }
117 #endif
118
119 // If the vtable entry is null, the method is abstract.
120 address ame_addr = __ pc(); // ame = abstract method error
121 __ null_check(R19_method, in_bytes(Method::from_compiled_offset()), /*implicit only*/NULL);
122 __ ld(R12_scratch2, in_bytes(Method::from_compiled_offset()), R19_method);
123 __ mtctr(R12_scratch2);
124 __ bctr();
125
126 masm->flush();
127
128 guarantee(__ pc() <= s->code_end(), "overflowed buffer");
129
130 s->set_exception_points(npe_addr, ame_addr);
131
132 return s;
133 }
134
135 VtableStub* VtableStubs::create_itable_stub(int itable_index) {
136 // PPC port: use fixed size.
137 const int code_length = VtableStub::pd_code_size_limit(false);
138 VtableStub* s = new (code_length) VtableStub(false, itable_index);
139
140 // Can be NULL if there is no free space in the code cache.
141 if (s == NULL) {
142 return NULL;
143 }
144
145 ResourceMark rm;
146 CodeBuffer cb(s->entry_point(), code_length);
147 MacroAssembler* masm = new MacroAssembler(&cb);
148 address start_pc;
149
150 #ifndef PRODUCT
151 if (CountCompiledCalls) {
152 int offs = __ load_const_optimized(R11_scratch1, SharedRuntime::nof_megamorphic_calls_addr(), R12_scratch2, true);
153 __ lwz(R12_scratch2, offs, R11_scratch1);
154 __ addi(R12_scratch2, R12_scratch2, 1);
155 __ stw(R12_scratch2, offs, R11_scratch1);
156 }
157 #endif
158
159 assert(VtableStub::receiver_location() == R3_ARG1->as_VMReg(), "receiver expected in R3_ARG1");
160
161 // Entry arguments:
162 // R19_method: Interface
163 // R3_ARG1: Receiver
164
165 Label L_no_such_interface;
166 const Register rcvr_klass = R11_scratch1,
167 interface = R12_scratch2,
168 tmp1 = R21_tmp1,
169 tmp2 = R22_tmp2;
170
171 address npe_addr = __ pc(); // npe = null pointer exception
172 __ null_check(R3_ARG1, oopDesc::klass_offset_in_bytes(), /*implicit only*/NULL);
173 __ load_klass(rcvr_klass, R3_ARG1);
174
175 // Receiver subtype check against REFC.
176 __ ld(interface, CompiledICHolder::holder_klass_offset(), R19_method);
177 __ lookup_interface_method(rcvr_klass, interface, noreg,
178 R0, tmp1, tmp2,
179 L_no_such_interface, /*return_method=*/ false);
180
181 // Get Method* and entrypoint for compiler
182 __ ld(interface, CompiledICHolder::holder_metadata_offset(), R19_method);
183 __ lookup_interface_method(rcvr_klass, interface, itable_index,
184 R19_method, tmp1, tmp2,
185 L_no_such_interface, /*return_method=*/ true);
186
187 #ifndef PRODUCT
188 if (DebugVtables) {
189 Label ok;
190 __ cmpd(CCR0, R19_method, 0);
191 __ bne(CCR0, ok);
192 __ stop("method is null", 103);
193 __ bind(ok);
194 }
195 #endif
196
197 // If the vtable entry is null, the method is abstract.
198 address ame_addr = __ pc(); // ame = abstract method error
199
200 // Must do an explicit check if implicit checks are disabled.
201 __ null_check(R19_method, in_bytes(Method::from_compiled_offset()), &L_no_such_interface);
202 __ ld(R12_scratch2, in_bytes(Method::from_compiled_offset()), R19_method);
203 __ mtctr(R12_scratch2);
204 __ bctr();
205
206 // Handle IncompatibleClassChangeError in itable stubs.
207 // More detailed error message.
208 // We force resolving of the call site by jumping to the "handle
209 // wrong method" stub, and so let the interpreter runtime do all the
210 // dirty work.
211 __ bind(L_no_such_interface);
212 __ load_const_optimized(R11_scratch1, SharedRuntime::get_handle_wrong_method_stub(), R12_scratch2);
213 __ mtctr(R11_scratch1);
214 __ bctr();
215
216 masm->flush();
217
218 guarantee(__ pc() <= s->code_end(), "overflowed buffer");
219
220 s->set_exception_points(npe_addr, ame_addr);
221 return s;
222 }
223
224 int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
225 if (DebugVtables || CountCompiledCalls || VerifyOops) {
226 return 1000;
227 }
228 int size = is_vtable_stub ? 20 + 8 : 164 + 20; // Plain + safety
229 if (UseCompressedClassPointers) {
230 size += MacroAssembler::instr_size_for_decode_klass_not_null();
231 }
232 if (!ImplicitNullChecks || !os::zero_page_read_protected()) {
233 size += is_vtable_stub ? 8 : 12;
234 }
235 return size;
236 }
237
238 int VtableStub::pd_code_alignment() {
239 const unsigned int icache_line_size = 32;
240 return icache_line_size;
241 }