1/*
2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2016 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/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
49extern "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.
54VtableStub* 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 = in_bytes(Klass::vtable_start_offset()) + vtable_index*vtableEntry::size_in_bytes();
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, in_bytes(Klass::vtable_length_offset()), 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 + 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
128VtableStub* 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, in_bytes(Klass::vtable_length_offset()), rcvr_klass);
167  __ slwi(vtable_len, vtable_len, exact_log2(vtableEntry::size_in_bytes()));
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 = in_bytes(Klass::vtable_start_offset());
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
245int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
246  if (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
258int VtableStub::pd_code_alignment() {
259  const unsigned int icache_line_size = 32;
260  return icache_line_size;
261}
262