1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2015 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_64.hpp"
30 #include "memory/resourceArea.hpp"
31 #include "oops/instanceKlass.hpp"
32 #include "oops/klassVtable.hpp"
33 #include "runtime/sharedRuntime.hpp"
34 #include "vmreg_ppc.inline.hpp"
35 #ifdef COMPILER2
36 #include "opto/runtime.hpp"
37 #endif
38
39 #define __ masm->
40
41 #ifdef PRODUCT
42 #define BLOCK_COMMENT(str) // nothing
43 #else
44 #define BLOCK_COMMENT(str) __ block_comment(str)
45 #endif
46 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
47
48 #ifndef PRODUCT
49 extern "C" void bad_compiled_vtable_index(JavaThread* thread, oopDesc* receiver, int index);
50 #endif
51
52 // Used by compiler only; may use only caller saved, non-argument
53 // registers.
54 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
55 // PPC port: use fixed size.
56 const int code_length = VtableStub::pd_code_size_limit(true);
57 VtableStub* s = new (code_length) VtableStub(true, vtable_index);
58 ResourceMark rm;
59 CodeBuffer cb(s->entry_point(), code_length);
60 MacroAssembler* masm = new MacroAssembler(&cb);
61 address start_pc;
62
63 #ifndef PRODUCT
64 if (CountCompiledCalls) {
65 __ load_const(R11_scratch1, SharedRuntime::nof_megamorphic_calls_addr());
66 __ lwz(R12_scratch2, 0, R11_scratch1);
67 __ addi(R12_scratch2, R12_scratch2, 1);
68 __ stw(R12_scratch2, 0, R11_scratch1);
69 }
70 #endif
71
72 assert(VtableStub::receiver_location() == R3_ARG1->as_VMReg(), "receiver expected in R3_ARG1");
73
74 // Get receiver klass.
75 const Register rcvr_klass = R11_scratch1;
76
77 // We might implicit NULL fault here.
78 address npe_addr = __ pc(); // npe = null pointer exception
79 __ null_check(R3, oopDesc::klass_offset_in_bytes(), /*implicit only*/NULL);
80 __ load_klass(rcvr_klass, R3);
81
82 // Set method (in case of interpreted method), and destination address.
83 int entry_offset = InstanceKlass::vtable_start_offset() + vtable_index*vtableEntry::size();
84
85 #ifndef PRODUCT
86 if (DebugVtables) {
87 Label L;
88 // Check offset vs vtable length.
89 const Register vtable_len = R12_scratch2;
90 __ lwz(vtable_len, InstanceKlass::vtable_length_offset()*wordSize, rcvr_klass);
91 __ cmpwi(CCR0, vtable_len, vtable_index*vtableEntry::size());
92 __ bge(CCR0, L);
93 __ li(R12_scratch2, vtable_index);
94 __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), R3_ARG1, R12_scratch2, false);
95 __ bind(L);
96 }
97 #endif
98
99 int v_off = entry_offset*wordSize + vtableEntry::method_offset_in_bytes();
100
101 __ ld(R19_method, v_off, rcvr_klass);
102
103 #ifndef PRODUCT
104 if (DebugVtables) {
105 Label L;
106 __ cmpdi(CCR0, R19_method, 0);
107 __ bne(CCR0, L);
108 __ stop("Vtable entry is ZERO", 102);
109 __ bind(L);
110 }
111 #endif
112
113 // If the vtable entry is null, the method is abstract.
114 address ame_addr = __ pc(); // ame = abstract method error
115 __ null_check(R19_method, in_bytes(Method::from_compiled_offset()), /*implicit only*/NULL);
116 __ ld(R12_scratch2, in_bytes(Method::from_compiled_offset()), R19_method);
117 __ mtctr(R12_scratch2);
118 __ bctr();
119 masm->flush();
120
121 guarantee(__ pc() <= s->code_end(), "overflowed buffer");
122
123 s->set_exception_points(npe_addr, ame_addr);
124
125 return s;
126 }
127
128 VtableStub* VtableStubs::create_itable_stub(int vtable_index) {
129 // PPC port: use fixed size.
130 const int code_length = VtableStub::pd_code_size_limit(false);
131 VtableStub* s = new (code_length) VtableStub(false, vtable_index);
132 ResourceMark rm;
133 CodeBuffer cb(s->entry_point(), code_length);
134 MacroAssembler* masm = new MacroAssembler(&cb);
135 address start_pc;
136
137 #ifndef PRODUCT
138 if (CountCompiledCalls) {
139 __ load_const(R11_scratch1, SharedRuntime::nof_megamorphic_calls_addr());
140 __ lwz(R12_scratch2, 0, R11_scratch1);
141 __ addi(R12_scratch2, R12_scratch2, 1);
142 __ stw(R12_scratch2, 0, R11_scratch1);
143 }
144 #endif
145
146 assert(VtableStub::receiver_location() == R3_ARG1->as_VMReg(), "receiver expected in R3_ARG1");
147
148 // Entry arguments:
149 // R19_method: Interface
150 // R3_ARG1: Receiver
151 //
152
153 const Register rcvr_klass = R11_scratch1;
154 const Register vtable_len = R12_scratch2;
155 const Register itable_entry_addr = R21_tmp1;
156 const Register itable_interface = R22_tmp2;
157
158 // Get receiver klass.
159
160 // We might implicit NULL fault here.
161 address npe_addr = __ pc(); // npe = null pointer exception
162 __ null_check(R3_ARG1, oopDesc::klass_offset_in_bytes(), /*implicit only*/NULL);
163 __ load_klass(rcvr_klass, R3_ARG1);
164
165 BLOCK_COMMENT("Load start of itable entries into itable_entry.");
166 __ lwz(vtable_len, InstanceKlass::vtable_length_offset() * wordSize, rcvr_klass);
167 __ slwi(vtable_len, vtable_len, exact_log2(vtableEntry::size() * wordSize));
168 __ add(itable_entry_addr, vtable_len, rcvr_klass);
169
170 // Loop over all itable entries until desired interfaceOop(Rinterface) found.
171 BLOCK_COMMENT("Increment itable_entry_addr in loop.");
172 const int vtable_base_offset = InstanceKlass::vtable_start_offset() * wordSize;
173 __ addi(itable_entry_addr, itable_entry_addr, vtable_base_offset + itableOffsetEntry::interface_offset_in_bytes());
174
175 const int itable_offset_search_inc = itableOffsetEntry::size() * wordSize;
176 Label search;
177 __ bind(search);
178 __ ld(itable_interface, 0, itable_entry_addr);
179
180 // Handle IncompatibleClassChangeError in itable stubs.
181 // If the entry is NULL then we've reached the end of the table
182 // without finding the expected interface, so throw an exception.
183 BLOCK_COMMENT("Handle IncompatibleClassChangeError in itable stubs.");
184 Label throw_icce;
185 __ cmpdi(CCR1, itable_interface, 0);
186 __ cmpd(CCR0, itable_interface, R19_method);
187 __ addi(itable_entry_addr, itable_entry_addr, itable_offset_search_inc);
188 __ beq(CCR1, throw_icce);
189 __ bne(CCR0, search);
190
191 // Entry found and itable_entry_addr points to it, get offset of vtable for interface.
192
193 const Register vtable_offset = R12_scratch2;
194 const Register itable_method = R11_scratch1;
195
196 const int vtable_offset_offset = (itableOffsetEntry::offset_offset_in_bytes() -
197 itableOffsetEntry::interface_offset_in_bytes()) -
198 itable_offset_search_inc;
199 __ lwz(vtable_offset, vtable_offset_offset, itable_entry_addr);
200
201 // Compute itableMethodEntry and get method and entry point for compiler.
202 const int method_offset = (itableMethodEntry::size() * wordSize * vtable_index) +
203 itableMethodEntry::method_offset_in_bytes();
204
205 __ add(itable_method, rcvr_klass, vtable_offset);
206 __ ld(R19_method, method_offset, itable_method);
207
208 #ifndef PRODUCT
209 if (DebugVtables) {
210 Label ok;
211 __ cmpd(CCR0, R19_method, 0);
212 __ bne(CCR0, ok);
213 __ stop("method is null", 103);
214 __ bind(ok);
215 }
216 #endif
217
218 // If the vtable entry is null, the method is abstract.
219 address ame_addr = __ pc(); // ame = abstract method error
220
221 // Must do an explicit check if implicit checks are disabled.
222 __ null_check(R19_method, in_bytes(Method::from_compiled_offset()), &throw_icce);
223 __ ld(R12_scratch2, in_bytes(Method::from_compiled_offset()), R19_method);
224 __ mtctr(R12_scratch2);
225 __ bctr();
226
227 // Handle IncompatibleClassChangeError in itable stubs.
228 // More detailed error message.
229 // We force resolving of the call site by jumping to the "handle
230 // wrong method" stub, and so let the interpreter runtime do all the
231 // dirty work.
232 __ bind(throw_icce);
233 __ load_const(R11_scratch1, SharedRuntime::get_handle_wrong_method_stub());
234 __ mtctr(R11_scratch1);
235 __ bctr();
236
237 masm->flush();
238
239 guarantee(__ pc() <= s->code_end(), "overflowed buffer");
240
241 s->set_exception_points(npe_addr, ame_addr);
242 return s;
243 }
244
245 int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
246 if (TraceJumps || DebugVtables || CountCompiledCalls || VerifyOops) {
247 return 1000;
248 } else {
249 int decode_klass_size = MacroAssembler::instr_size_for_decode_klass_not_null();
250 if (is_vtable_stub) {
251 return 20 + decode_klass_size + 8 + 8; // Plain + cOops + Traps + safety
252 } else {
253 return 96 + decode_klass_size + 12 + 8; // Plain + cOops + Traps + safety
254 }
255 }
256 }
257
258 int VtableStub::pd_code_alignment() {
259 const unsigned int icache_line_size = 32;
260 return icache_line_size;
261 }