1 /*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "asm/assembler.hpp"
27 #include "assembler_sparc.inline.hpp"
28 #include "code/vtableStubs.hpp"
29 #include "interp_masm_sparc.hpp"
30 #include "memory/resourceArea.hpp"
31 #include "oops/instanceKlass.hpp"
32 #include "oops/klassVtable.hpp"
33 #include "runtime/sharedRuntime.hpp"
34 #include "vmreg_sparc.inline.hpp"
35 #ifdef COMPILER2
36 #include "opto/runtime.hpp"
37 #endif
38
39 // machine-dependent part of VtableStubs: create vtableStub of correct size and
40 // initialize its code
41
42 #define __ masm->
43
44
45 #ifndef PRODUCT
46 extern "C" void bad_compiled_vtable_index(JavaThread* thread, oopDesc* receiver, int index);
47 #endif
48
49
50 // Used by compiler only; may use only caller saved, non-argument registers
51 // NOTE: %%%% if any change is made to this stub make sure that the function
52 // pd_code_size_limit is changed to ensure the correct size for VtableStub
53 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
54 const int sparc_code_length = VtableStub::pd_code_size_limit(true);
55 VtableStub* s = new(sparc_code_length) VtableStub(true, vtable_index);
56 ResourceMark rm;
57 CodeBuffer cb(s->entry_point(), sparc_code_length);
58 MacroAssembler* masm = new MacroAssembler(&cb);
59
60 #ifndef PRODUCT
61 if (CountCompiledCalls) {
62 __ inc_counter(SharedRuntime::nof_megamorphic_calls_addr(), G5, G3_scratch);
63 }
64 #endif /* PRODUCT */
65
66 assert(VtableStub::receiver_location() == O0->as_VMReg(), "receiver expected in O0");
67
68 // get receiver klass
69 address npe_addr = __ pc();
70 __ load_klass(O0, G3_scratch);
71
72 // set methodOop (in case of interpreted method), and destination address
73 int entry_offset = instanceKlass::vtable_start_offset() + vtable_index*vtableEntry::size();
74 #ifndef PRODUCT
75 if (DebugVtables) {
76 Label L;
77 // check offset vs vtable length
78 __ ld(G3_scratch, instanceKlass::vtable_length_offset()*wordSize, G5);
79 __ cmp(G5, vtable_index*vtableEntry::size());
80 __ br(Assembler::greaterUnsigned, false, Assembler::pt, L);
81 __ delayed()->nop();
82 __ set(vtable_index, O2);
83 __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), O0, O2);
84 __ bind(L);
85 }
86 #endif
87 int v_off = entry_offset*wordSize + vtableEntry::method_offset_in_bytes();
88 if( __ is_simm13(v_off) ) {
89 __ ld_ptr(G3, v_off, G5_method);
90 } else {
91 __ set(v_off,G5);
92 __ ld_ptr(G3, G5, G5_method);
93 }
94
95 #ifndef PRODUCT
96 if (DebugVtables) {
97 Label L;
98 __ br_notnull(G5_method, false, Assembler::pt, L);
99 __ delayed()->nop();
100 __ stop("Vtable entry is ZERO");
101 __ bind(L);
102 }
103 #endif
104
105 address ame_addr = __ pc(); // if the vtable entry is null, the method is abstract
106 // NOTE: for vtable dispatches, the vtable entry will never be null.
107
108 __ ld_ptr(G5_method, in_bytes(methodOopDesc::from_compiled_offset()), G3_scratch);
109
110 // jump to target (either compiled code or c2iadapter)
111 __ JMP(G3_scratch, 0);
112 // load methodOop (in case we call c2iadapter)
113 __ delayed()->nop();
114
115 masm->flush();
116
117 if (PrintMiscellaneous && (WizardMode || Verbose)) {
118 tty->print_cr("vtable #%d at "PTR_FORMAT"[%d] left over: %d",
119 vtable_index, s->entry_point(),
120 (int)(s->code_end() - s->entry_point()),
121 (int)(s->code_end() - __ pc()));
122 }
123 guarantee(__ pc() <= s->code_end(), "overflowed buffer");
124 // shut the door on sizing bugs
125 int slop = 2*BytesPerInstWord; // 32-bit offset is this much larger than a 13-bit one
126 assert(vtable_index > 10 || __ pc() + slop <= s->code_end(), "room for sethi;add");
127
128 s->set_exception_points(npe_addr, ame_addr);
129 return s;
130 }
131
132
133 // NOTE: %%%% if any change is made to this stub make sure that the function
134 // pd_code_size_limit is changed to ensure the correct size for VtableStub
135 VtableStub* VtableStubs::create_itable_stub(int itable_index) {
136 const int sparc_code_length = VtableStub::pd_code_size_limit(false);
137 VtableStub* s = new(sparc_code_length) VtableStub(false, itable_index);
138 ResourceMark rm;
139 CodeBuffer cb(s->entry_point(), sparc_code_length);
140 MacroAssembler* masm = new MacroAssembler(&cb);
141
142 Register G3_klassOop = G3_scratch;
143 Register G5_interface = G5; // Passed in as an argument
144 Label search;
145
146 // Entry arguments:
147 // G5_interface: Interface
148 // O0: Receiver
149 assert(VtableStub::receiver_location() == O0->as_VMReg(), "receiver expected in O0");
150
151 // get receiver klass (also an implicit null-check)
152 address npe_addr = __ pc();
153 __ load_klass(O0, G3_klassOop);
154 __ verify_oop(G3_klassOop);
155
156 // Push a new window to get some temp registers. This chops the head of all
157 // my 64-bit %o registers in the LION build, but this is OK because no longs
158 // are passed in the %o registers. Instead, longs are passed in G1 and G4
159 // and so those registers are not available here.
160 __ save(SP,-frame::register_save_words*wordSize,SP);
161
162 #ifndef PRODUCT
163 if (CountCompiledCalls) {
164 __ inc_counter(SharedRuntime::nof_megamorphic_calls_addr(), L0, L1);
165 }
166 #endif /* PRODUCT */
167
168 Label throw_icce;
169
170 Register L5_method = L5;
171 __ lookup_interface_method(// inputs: rec. class, interface, itable index
172 G3_klassOop, G5_interface, itable_index,
173 // outputs: method, scan temp. reg
174 L5_method, L2, L3,
175 throw_icce);
176
177 #ifndef PRODUCT
178 if (DebugVtables) {
179 Label L01;
180 __ bpr(Assembler::rc_nz, false, Assembler::pt, L5_method, L01);
181 __ delayed()->nop();
182 __ stop("methodOop is null");
183 __ bind(L01);
184 __ verify_oop(L5_method);
185 }
186 #endif
187
188 // If the following load is through a NULL pointer, we'll take an OS
189 // exception that should translate into an AbstractMethodError. We need the
190 // window count to be correct at that time.
191 __ restore(L5_method, 0, G5_method);
192 // Restore registers *before* the AME point.
193
194 address ame_addr = __ pc(); // if the vtable entry is null, the method is abstract
195 __ ld_ptr(G5_method, in_bytes(methodOopDesc::from_compiled_offset()), G3_scratch);
196
197 // G5_method: methodOop
198 // O0: Receiver
199 // G3_scratch: entry point
200 __ JMP(G3_scratch, 0);
201 __ delayed()->nop();
202
203 __ bind(throw_icce);
204 AddressLiteral icce(StubRoutines::throw_IncompatibleClassChangeError_entry());
205 __ jump_to(icce, G3_scratch);
206 __ delayed()->restore();
207
208 masm->flush();
209
210 if (PrintMiscellaneous && (WizardMode || Verbose)) {
211 tty->print_cr("itable #%d at "PTR_FORMAT"[%d] left over: %d",
212 itable_index, s->entry_point(),
213 (int)(s->code_end() - s->entry_point()),
214 (int)(s->code_end() - __ pc()));
215 }
216 guarantee(__ pc() <= s->code_end(), "overflowed buffer");
217 // shut the door on sizing bugs
218 int slop = 2*BytesPerInstWord; // 32-bit offset is this much larger than a 13-bit one
219 assert(itable_index > 10 || __ pc() + slop <= s->code_end(), "room for sethi;add");
220
221 s->set_exception_points(npe_addr, ame_addr);
222 return s;
223 }
224
225
226 int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
227 if (TraceJumps || DebugVtables || CountCompiledCalls || VerifyOops) return 1000;
228 else {
229 const int slop = 2*BytesPerInstWord; // sethi;add (needed for long offsets)
230 if (is_vtable_stub) {
231 // ld;ld;ld,jmp,nop
232 const int basic = 5*BytesPerInstWord +
233 // shift;add for load_klass (only shift with zero heap based)
234 (UseCompressedOops ?
235 ((Universe::narrow_oop_base() == NULL) ? BytesPerInstWord : 2*BytesPerInstWord) : 0);
236 return basic + slop;
237 } else {
238 const int basic = (28 LP64_ONLY(+ 6)) * BytesPerInstWord +
239 // shift;add for load_klass (only shift with zero heap based)
240 (UseCompressedOops ?
241 ((Universe::narrow_oop_base() == NULL) ? BytesPerInstWord : 2*BytesPerInstWord) : 0);
242 return (basic + slop);
243 }
244 }
245
246 // In order to tune these parameters, run the JVM with VM options
247 // +PrintMiscellaneous and +WizardMode to see information about
248 // actual itable stubs. Look for lines like this:
249 // itable #1 at 0x5551212[116] left over: 8
250 // Reduce the constants so that the "left over" number is 8
251 // Do not aim at a left-over number of zero, because a very
252 // large vtable or itable offset (> 4K) will require an extra
253 // sethi/or pair of instructions.
254 //
255 // The JVM98 app. _202_jess has a megamorphic interface call.
256 // The itable code looks like this:
257 // Decoding VtableStub itbl[1]@16
258 // ld [ %o0 + 4 ], %g3
259 // save %sp, -64, %sp
260 // ld [ %g3 + 0xe8 ], %l2
261 // sll %l2, 2, %l2
262 // add %l2, 0x134, %l2
263 // and %l2, -8, %l2 ! NOT_LP64 only
264 // add %g3, %l2, %l2
265 // add %g3, 4, %g3
266 // ld [ %l2 ], %l5
267 // brz,pn %l5, throw_icce
268 // cmp %l5, %g5
269 // be %icc, success
270 // add %l2, 8, %l2
271 // loop:
272 // ld [ %l2 ], %l5
273 // brz,pn %l5, throw_icce
274 // cmp %l5, %g5
275 // bne,pn %icc, loop
276 // add %l2, 8, %l2
277 // success:
278 // ld [ %l2 + -4 ], %l2
279 // ld [ %g3 + %l2 ], %l5
280 // restore %l5, 0, %g5
281 // ld [ %g5 + 0x44 ], %g3
282 // jmp %g3
283 // nop
284 // throw_icce:
285 // sethi %hi(throw_ICCE_entry), %g3
286 // ! 5 more instructions here, LP64_ONLY
287 // jmp %g3 + %lo(throw_ICCE_entry)
288 // restore
289 }
290
291
292 int VtableStub::pd_code_alignment() {
293 // UltraSPARC cache line size is 8 instructions:
294 const unsigned int icache_line_size = 32;
295 return icache_line_size;
296 }