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 #ifndef PRODUCT
43 extern "C" void bad_compiled_vtable_index(JavaThread* thread, oopDesc* receiver, int index);
44 #endif
45
46 // Used by compiler only; may use only caller saved, non-argument registers.
47 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
48 // Read "A word on VtableStub sizing" in share/code/vtableStubs.hpp for details on stub sizing.
49 const int stub_code_length = code_size_limit(true);
50 VtableStub* s = new(stub_code_length) VtableStub(true, vtable_index);
51 // Can be NULL if there is no free space in the code cache.
52 if (s == NULL) {
53 return NULL;
54 }
55
56 // Count unused bytes in instruction sequences of variable size.
57 // We add them to the computed buffer size in order to avoid
58 // overflow in subsequently generated stubs.
59 address start_pc;
60 int slop_bytes = 8; // just a two-instruction safety net
61 int slop_delta = 0;
62
63 ResourceMark rm;
64 CodeBuffer cb(s->entry_point(), stub_code_length);
65 MacroAssembler* masm = new MacroAssembler(&cb);
66
67 #if (!defined(PRODUCT) && defined(COMPILER2))
68 if (CountCompiledCalls) {
69 start_pc = __ pc();
70 int load_const_maxLen = 5*BytesPerInstWord; // load_const generates 5 instructions. Assume that as max size for laod_const_optimized
71 int offs = __ load_const_optimized(R11_scratch1, SharedRuntime::nof_megamorphic_calls_addr(), R12_scratch2, true);
72 slop_delta = load_const_maxLen - (__ pc() - start_pc);
73 slop_bytes += slop_delta;
74 assert(slop_delta >= 0, "negative slop(%d) encountered, adjust code size estimate!", slop_delta);
75 __ lwz(R12_scratch2, offs, R11_scratch1);
76 __ addi(R12_scratch2, R12_scratch2, 1);
77 __ stw(R12_scratch2, offs, R11_scratch1);
78 }
79 #endif
80
81 assert(VtableStub::receiver_location() == R3_ARG1->as_VMReg(), "receiver expected in R3_ARG1");
82
83 const Register rcvr_klass = R11_scratch1;
84 address npe_addr = __ pc(); // npe = null pointer exception
85 // check if we must do an explicit check (implicit checks disabled, offset too large).
86 __ null_check(R3, oopDesc::klass_offset_in_bytes(), /*implicit only*/NULL);
87 // Get receiver klass.
88 __ load_klass(rcvr_klass, R3);
89
90 #ifndef PRODUCT
91 if (DebugVtables) {
92 Label L;
93 // Check offset vs vtable length.
94 const Register vtable_len = R12_scratch2;
95 __ lwz(vtable_len, in_bytes(Klass::vtable_length_offset()), rcvr_klass);
96 __ cmpwi(CCR0, vtable_len, vtable_index*vtableEntry::size());
97 __ bge(CCR0, L);
98 __ li(R12_scratch2, vtable_index);
99 __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), R3_ARG1, R12_scratch2, false);
100 __ bind(L);
101 }
102 #endif
103
104 int entry_offset = in_bytes(Klass::vtable_start_offset()) +
105 vtable_index*vtableEntry::size_in_bytes();
106 int v_off = entry_offset + vtableEntry::method_offset_in_bytes();
107
108 __ ld(R19_method, (RegisterOrConstant)v_off, rcvr_klass);
109
110 #ifndef PRODUCT
111 if (DebugVtables) {
112 Label L;
113 __ cmpdi(CCR0, R19_method, 0);
114 __ bne(CCR0, L);
115 __ stop("Vtable entry is ZERO", 102);
116 __ bind(L);
117 }
118 #endif
119
120 address ame_addr = __ pc(); // ame = abstract method error
121 // if the vtable entry is null, the method is abstract
122 // NOTE: for vtable dispatches, the vtable entry will never be null.
123
124 __ null_check(R19_method, in_bytes(Method::from_compiled_offset()), /*implicit only*/NULL);
125 __ ld(R12_scratch2, in_bytes(Method::from_compiled_offset()), R19_method);
126 __ mtctr(R12_scratch2);
127 __ bctr();
128
129 masm->flush();
130 bookkeeping(masm, tty, s, npe_addr, ame_addr, true, vtable_index, slop_bytes, 0);
131
132 return s;
133 }
134
135 VtableStub* VtableStubs::create_itable_stub(int itable_index) {
136 // Read "A word on VtableStub sizing" in share/code/vtableStubs.hpp for details on stub sizing.
137 const int stub_code_length = code_size_limit(false);
138 VtableStub* s = new(stub_code_length) VtableStub(false, itable_index);
139 // Can be NULL if there is no free space in the code cache.
140 if (s == NULL) {
141 return NULL;
142 }
143 // Count unused bytes in instruction sequences of variable size.
144 // We add them to the computed buffer size in order to avoid
145 // overflow in subsequently generated stubs.
146 address start_pc;
147 int slop_bytes = 8; // just a two-instruction safety net
148 int slop_delta = 0;
149
150 ResourceMark rm;
151 CodeBuffer cb(s->entry_point(), stub_code_length);
152 MacroAssembler* masm = new MacroAssembler(&cb);
153 int load_const_maxLen = 5*BytesPerInstWord; // load_const generates 5 instructions. Assume that as max size for laod_const_optimized
154
155 #if (!defined(PRODUCT) && defined(COMPILER2))
156 if (CountCompiledCalls) {
157 start_pc = __ pc();
158 int offs = __ load_const_optimized(R11_scratch1, SharedRuntime::nof_megamorphic_calls_addr(), R12_scratch2, true);
159 slop_delta = load_const_maxLen - (__ pc() - start_pc);
160 slop_bytes += slop_delta;
161 assert(slop_delta >= 0, "negative slop(%d) encountered, adjust code size estimate!", slop_delta);
162 __ lwz(R12_scratch2, offs, R11_scratch1);
163 __ addi(R12_scratch2, R12_scratch2, 1);
164 __ stw(R12_scratch2, offs, R11_scratch1);
165 }
166 #endif
167
168 assert(VtableStub::receiver_location() == R3_ARG1->as_VMReg(), "receiver expected in R3_ARG1");
169
170 // Entry arguments:
171 // R19_method: Interface
172 // R3_ARG1: Receiver
173
174 Label L_no_such_interface;
175 const Register rcvr_klass = R11_scratch1,
176 interface = R12_scratch2,
177 tmp1 = R21_tmp1,
178 tmp2 = R22_tmp2;
179
180 address npe_addr = __ pc(); // npe = null pointer exception
181 __ null_check(R3_ARG1, oopDesc::klass_offset_in_bytes(), /*implicit only*/NULL);
182 __ load_klass(rcvr_klass, R3_ARG1);
183
184 // Receiver subtype check against REFC.
185 __ ld(interface, CompiledICHolder::holder_klass_offset(), R19_method);
186 __ lookup_interface_method(rcvr_klass, interface, noreg,
187 R0, tmp1, tmp2,
188 L_no_such_interface, /*return_method=*/ false);
189
190 // Get Method* and entrypoint for compiler
191 __ ld(interface, CompiledICHolder::holder_metadata_offset(), R19_method);
192 __ lookup_interface_method(rcvr_klass, interface, itable_index,
193 R19_method, tmp1, tmp2,
194 L_no_such_interface, /*return_method=*/ true);
195
196 #ifndef PRODUCT
197 if (DebugVtables) {
198 Label ok;
199 __ cmpd(CCR0, R19_method, 0);
200 __ bne(CCR0, ok);
201 __ stop("method is null", 103);
202 __ bind(ok);
203 }
204 #endif
205
206 // If the vtable entry is null, the method is abstract.
207 address ame_addr = __ pc(); // ame = abstract method error
208
209 // Must do an explicit check if implicit checks are disabled.
210 __ null_check(R19_method, in_bytes(Method::from_compiled_offset()), &L_no_such_interface);
211 __ ld(R12_scratch2, in_bytes(Method::from_compiled_offset()), R19_method);
212 __ mtctr(R12_scratch2);
213 __ bctr();
214
215 // Handle IncompatibleClassChangeError in itable stubs.
216 // More detailed error message.
217 // We force resolving of the call site by jumping to the "handle
218 // wrong method" stub, and so let the interpreter runtime do all the
219 // dirty work.
220 __ bind(L_no_such_interface);
221 start_pc = __ pc();
222 __ load_const_optimized(R11_scratch1, SharedRuntime::get_handle_wrong_method_stub(), R12_scratch2);
223 slop_delta = load_const_maxLen - (__ pc() - start_pc);
224 slop_bytes += slop_delta;
225 assert(slop_delta >= 0, "negative slop(%d) encountered, adjust code size estimate!", slop_delta);
226 __ mtctr(R11_scratch1);
227 __ bctr();
228
229 masm->flush();
230 bookkeeping(masm, tty, s, npe_addr, ame_addr, false, itable_index, slop_bytes, 0);
231
232 return s;
233 }
234
235 int VtableStub::pd_code_alignment() {
236 // Power cache line size is 128 bytes, but we want to limit alignment loss.
237 const unsigned int icache_line_size = 32;
238 return icache_line_size;
239 }