1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * Copyright 2012, 2015 SAP AG. 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 __ load_klass_with_trap_null_check(rcvr_klass, R3);
80
81 // Set method (in case of interpreted method), and destination address.
82 int entry_offset = InstanceKlass::vtable_start_offset() + vtable_index*vtableEntry::size();
83
84 #ifndef PRODUCT
85 if (DebugVtables) {
86 Label L;
87 // Check offset vs vtable length.
88 const Register vtable_len = R12_scratch2;
89 __ lwz(vtable_len, InstanceKlass::vtable_length_offset()*wordSize, rcvr_klass);
90 __ cmpwi(CCR0, vtable_len, vtable_index*vtableEntry::size());
91 __ bge(CCR0, L);
92 __ li(R12_scratch2, vtable_index);
93 __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), R3_ARG1, R12_scratch2, false);
94 __ bind(L);
95 }
96 #endif
97
98 int v_off = entry_offset*wordSize + vtableEntry::method_offset_in_bytes();
99
100 __ ld(R19_method, v_off, rcvr_klass);
101
102 #ifndef PRODUCT
103 if (DebugVtables) {
104 Label L;
105 __ cmpdi(CCR0, R19_method, 0);
106 __ bne(CCR0, L);
107 __ stop("Vtable entry is ZERO", 102);
108 __ bind(L);
109 }
110 #endif
111
112 // If the vtable entry is null, the method is abstract.
113 address ame_addr = __ pc(); // ame = abstract method error
114
115 __ load_with_trap_null_check(R12_scratch2, in_bytes(Method::from_compiled_offset()), R19_method);
116 __ mtctr(R12_scratch2);
117 __ bctr();
118 masm->flush();
119
120 guarantee(__ pc() <= s->code_end(), "overflowed buffer");
121
122 s->set_exception_points(npe_addr, ame_addr);
123
124 return s;
125 }
126
127 VtableStub* VtableStubs::create_itable_stub(int vtable_index) {
128 // PPC port: use fixed size.
129 const int code_length = VtableStub::pd_code_size_limit(false);
130 VtableStub* s = new (code_length) VtableStub(false, vtable_index);
131 ResourceMark rm;
132 CodeBuffer cb(s->entry_point(), code_length);
133 MacroAssembler* masm = new MacroAssembler(&cb);
134 address start_pc;
135
136 #ifndef PRODUCT
137 if (CountCompiledCalls) {
138 __ load_const(R11_scratch1, SharedRuntime::nof_megamorphic_calls_addr());
139 __ lwz(R12_scratch2, 0, R11_scratch1);
140 __ addi(R12_scratch2, R12_scratch2, 1);
141 __ stw(R12_scratch2, 0, R11_scratch1);
142 }
143 #endif
144
145 assert(VtableStub::receiver_location() == R3_ARG1->as_VMReg(), "receiver expected in R3_ARG1");
146
147 // Entry arguments:
148 // R19_method: Interface
149 // R3_ARG1: Receiver
150 //
151
152 const Register rcvr_klass = R11_scratch1;
153 const Register vtable_len = R12_scratch2;
154 const Register itable_entry_addr = R21_tmp1;
155 const Register itable_interface = R22_tmp2;
156
157 // Get receiver klass.
158
159 // We might implicit NULL fault here.
160 address npe_addr = __ pc(); // npe = null pointer exception
161 __ load_klass_with_trap_null_check(rcvr_klass, R3_ARG1);
162
163 BLOCK_COMMENT("Load start of itable entries into itable_entry.");
164 __ lwz(vtable_len, InstanceKlass::vtable_length_offset() * wordSize, rcvr_klass);
165 __ slwi(vtable_len, vtable_len, exact_log2(vtableEntry::size() * wordSize));
166 __ add(itable_entry_addr, vtable_len, rcvr_klass);
167
168 // Loop over all itable entries until desired interfaceOop(Rinterface) found.
169 BLOCK_COMMENT("Increment itable_entry_addr in loop.");
170 const int vtable_base_offset = InstanceKlass::vtable_start_offset() * wordSize;
171 __ addi(itable_entry_addr, itable_entry_addr, vtable_base_offset + itableOffsetEntry::interface_offset_in_bytes());
172
173 const int itable_offset_search_inc = itableOffsetEntry::size() * wordSize;
174 Label search;
175 __ bind(search);
176 __ ld(itable_interface, 0, itable_entry_addr);
177
178 // Handle IncompatibleClassChangeError in itable stubs.
179 // If the entry is NULL then we've reached the end of the table
180 // without finding the expected interface, so throw an exception.
181 BLOCK_COMMENT("Handle IncompatibleClassChangeError in itable stubs.");
182 Label throw_icce;
183 __ cmpdi(CCR1, itable_interface, 0);
184 __ cmpd(CCR0, itable_interface, R19_method);
185 __ addi(itable_entry_addr, itable_entry_addr, itable_offset_search_inc);
186 __ beq(CCR1, throw_icce);
187 __ bne(CCR0, search);
188
189 // Entry found and itable_entry_addr points to it, get offset of vtable for interface.
190
191 const Register vtable_offset = R12_scratch2;
192 const Register itable_method = R11_scratch1;
193
194 const int vtable_offset_offset = (itableOffsetEntry::offset_offset_in_bytes() -
195 itableOffsetEntry::interface_offset_in_bytes()) -
196 itable_offset_search_inc;
197 __ lwz(vtable_offset, vtable_offset_offset, itable_entry_addr);
198
199 // Compute itableMethodEntry and get method and entry point for compiler.
200 const int method_offset = (itableMethodEntry::size() * wordSize * vtable_index) +
201 itableMethodEntry::method_offset_in_bytes();
202
203 __ add(itable_method, rcvr_klass, vtable_offset);
204 __ ld(R19_method, method_offset, itable_method);
205
206 #ifndef PRODUCT
207 if (DebugVtables) {
208 Label ok;
209 __ cmpd(CCR0, R19_method, 0);
210 __ bne(CCR0, ok);
211 __ stop("method is null", 103);
212 __ bind(ok);
213 }
214 #endif
215
216 // If the vtable entry is null, the method is abstract.
217 address ame_addr = __ pc(); // ame = abstract method error
218
219 // Must do an explicit check if implicit checks are disabled.
220 assert(!MacroAssembler::needs_explicit_null_check(in_bytes(Method::from_compiled_offset())), "sanity");
221 if (!ImplicitNullChecks || !os::zero_page_read_protected()) {
222 if (TrapBasedNullChecks) {
223 __ trap_null_check(R19_method);
224 } else {
225 __ cmpdi(CCR0, R19_method, 0);
226 __ beq(CCR0, throw_icce);
227 }
228 }
229 __ ld(R12_scratch2, in_bytes(Method::from_compiled_offset()), R19_method);
230 __ mtctr(R12_scratch2);
231 __ bctr();
232
233 // Handle IncompatibleClassChangeError in itable stubs.
234 // More detailed error message.
235 // We force resolving of the call site by jumping to the "handle
236 // wrong method" stub, and so let the interpreter runtime do all the
237 // dirty work.
238 __ bind(throw_icce);
239 __ load_const(R11_scratch1, SharedRuntime::get_handle_wrong_method_stub());
240 __ mtctr(R11_scratch1);
241 __ bctr();
242
243 masm->flush();
244
245 guarantee(__ pc() <= s->code_end(), "overflowed buffer");
246
247 s->set_exception_points(npe_addr, ame_addr);
248 return s;
249 }
250
251 int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
252 if (TraceJumps || DebugVtables || CountCompiledCalls || VerifyOops) {
253 return 1000;
254 } else {
255 int decode_klass_size = MacroAssembler::instr_size_for_decode_klass_not_null();
256 if (is_vtable_stub) {
257 return 20 + decode_klass_size + 8 + 8; // Plain + cOops + Traps + safety
258 } else {
259 return 96 + decode_klass_size + 12 + 8; // Plain + cOops + Traps + safety
260 }
261 }
262 }
263
264 int VtableStub::pd_code_alignment() {
265 const unsigned int icache_line_size = 32;
266 return icache_line_size;
267 }