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comparison: src/cpu/sparc/vm/vtableStubs_sparc.cpp

src/cpu/sparc/vm/vtableStubs_sparc.cpp

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1 /*
2 * Copyright (c) 1997, 2013, 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/macroAssembler.inline.hpp"
27 #include "code/vtableStubs.hpp"
28 #include "interp_masm_sparc.hpp"
29 #include "memory/resourceArea.hpp"
30 #include "oops/instanceKlass.hpp"
31 #include "oops/klassVtable.hpp"
32 #include "runtime/sharedRuntime.hpp"
33 #include "vmreg_sparc.inline.hpp"
34 #ifdef COMPILER2
35 #include "opto/runtime.hpp"
36 #endif
37
38 // machine-dependent part of VtableStubs: create vtableStub of correct size and
39 // initialize its code
40
41 #define __ masm->
42
43
44 #ifndef PRODUCT
45 extern "C" void bad_compiled_vtable_index(JavaThread* thread, oopDesc* receiver, int index);
46 #endif
47
48
49 // Used by compiler only; may use only caller saved, non-argument registers
50 // NOTE: %%%% if any change is made to this stub make sure that the function
51 // pd_code_size_limit is changed to ensure the correct size for VtableStub
52 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
53 const int sparc_code_length = VtableStub::pd_code_size_limit(true);
54 VtableStub* s = new(sparc_code_length) VtableStub(true, vtable_index);
55 // Can be NULL if there is no free space in the code cache.
56 if (s == NULL) {
57 return NULL;
58 }
59
60 ResourceMark rm;
61 CodeBuffer cb(s->entry_point(), sparc_code_length);
62 MacroAssembler* masm = new MacroAssembler(&cb);
63
64 #ifndef PRODUCT
65 if (CountCompiledCalls) {
66 __ inc_counter(SharedRuntime::nof_megamorphic_calls_addr(), G5, G3_scratch);
67 }
68 #endif /* PRODUCT */
69
70 assert(VtableStub::receiver_location() == O0->as_VMReg(), "receiver expected in O0");
71
72 // get receiver klass
73 address npe_addr = __ pc();
74 __ load_klass(O0, G3_scratch);
75
76 // set Method* (in case of interpreted method), and destination address
77 #ifndef PRODUCT
78 if (DebugVtables) {
79 Label L;
80 // check offset vs vtable length
81 __ ld(G3_scratch, InstanceKlass::vtable_length_offset()*wordSize, G5);
82 __ cmp_and_br_short(G5, vtable_index*vtableEntry::size(), Assembler::greaterUnsigned, Assembler::pt, L);
83 __ set(vtable_index, O2);
84 __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), O0, O2);
85 __ bind(L);
86 }
87 #endif
88
89 __ lookup_virtual_method(G3_scratch, vtable_index, G5_method);
90
91 #ifndef PRODUCT
92 if (DebugVtables) {
93 Label L;
94 __ br_notnull_short(G5_method, Assembler::pt, L);
95 __ stop("Vtable entry is ZERO");
96 __ bind(L);
97 }
98 #endif
99
100 address ame_addr = __ pc(); // if the vtable entry is null, the method is abstract
101 // NOTE: for vtable dispatches, the vtable entry will never be null.
102
103 __ ld_ptr(G5_method, in_bytes(Method::from_compiled_offset()), G3_scratch);
104
105 // jump to target (either compiled code or c2iadapter)
106 __ JMP(G3_scratch, 0);
107 // load Method* (in case we call c2iadapter)
108 __ delayed()->nop();
109
110 masm->flush();
111
112 if (PrintMiscellaneous && (WizardMode || Verbose)) {
113 tty->print_cr("vtable #%d at "PTR_FORMAT"[%d] left over: %d",
114 vtable_index, s->entry_point(),
115 (int)(s->code_end() - s->entry_point()),
116 (int)(s->code_end() - __ pc()));
117 }
118 guarantee(__ pc() <= s->code_end(), "overflowed buffer");
119 // shut the door on sizing bugs
120 int slop = 2*BytesPerInstWord; // 32-bit offset is this much larger than a 13-bit one
121 assert(vtable_index > 10 || __ pc() + slop <= s->code_end(), "room for sethi;add");
122
123 s->set_exception_points(npe_addr, ame_addr);
124 return s;
125 }
126
127
128 // NOTE: %%%% if any change is made to this stub make sure that the function
129 // pd_code_size_limit is changed to ensure the correct size for VtableStub
130 VtableStub* VtableStubs::create_itable_stub(int itable_index) {
131 const int sparc_code_length = VtableStub::pd_code_size_limit(false);
132 VtableStub* s = new(sparc_code_length) VtableStub(false, itable_index);
133 // Can be NULL if there is no free space in the code cache.
134 if (s == NULL) {
135 return NULL;
136 }
137
138 ResourceMark rm;
139 CodeBuffer cb(s->entry_point(), sparc_code_length);
140 MacroAssembler* masm = new MacroAssembler(&cb);
141
142 Register G3_Klass = 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_Klass);
154
155 // Push a new window to get some temp registers. This chops the head of all
156 // my 64-bit %o registers in the LION build, but this is OK because no longs
157 // are passed in the %o registers. Instead, longs are passed in G1 and G4
158 // and so those registers are not available here.
159 __ save(SP,-frame::register_save_words*wordSize,SP);
160
161 #ifndef PRODUCT
162 if (CountCompiledCalls) {
163 __ inc_counter(SharedRuntime::nof_megamorphic_calls_addr(), L0, L1);
164 }
165 #endif /* PRODUCT */
166
167 Label throw_icce;
168
169 Register L5_method = L5;
170 __ lookup_interface_method(// inputs: rec. class, interface, itable index
171 G3_Klass, G5_interface, itable_index,
172 // outputs: method, scan temp. reg
173 L5_method, L2, L3,
174 throw_icce);
175
176 #ifndef PRODUCT
177 if (DebugVtables) {
178 Label L01;
179 __ br_notnull_short(L5_method, Assembler::pt, L01);
180 __ stop("Method* is null");
181 __ bind(L01);
182 }
183 #endif
184
185 // If the following load is through a NULL pointer, we'll take an OS
186 // exception that should translate into an AbstractMethodError. We need the
187 // window count to be correct at that time.
188 __ restore(L5_method, 0, G5_method);
189 // Restore registers *before* the AME point.
190
191 address ame_addr = __ pc(); // if the vtable entry is null, the method is abstract
192 __ ld_ptr(G5_method, in_bytes(Method::from_compiled_offset()), G3_scratch);
193
194 // G5_method: Method*
195 // O0: Receiver
196 // G3_scratch: entry point
197 __ JMP(G3_scratch, 0);
198 __ delayed()->nop();
199
200 __ bind(throw_icce);
201 AddressLiteral icce(StubRoutines::throw_IncompatibleClassChangeError_entry());
202 __ jump_to(icce, G3_scratch);
203 __ delayed()->restore();
204
205 masm->flush();
206
207 if (PrintMiscellaneous && (WizardMode || Verbose)) {
208 tty->print_cr("itable #%d at "PTR_FORMAT"[%d] left over: %d",
209 itable_index, s->entry_point(),
210 (int)(s->code_end() - s->entry_point()),
211 (int)(s->code_end() - __ pc()));
212 }
213 guarantee(__ pc() <= s->code_end(), "overflowed buffer");
214 // shut the door on sizing bugs
215 int slop = 2*BytesPerInstWord; // 32-bit offset is this much larger than a 13-bit one
216 assert(itable_index > 10 || __ pc() + slop <= s->code_end(), "room for sethi;add");
217
218 s->set_exception_points(npe_addr, ame_addr);
219 return s;
220 }
221
222
223 int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
224 if (TraceJumps || DebugVtables || CountCompiledCalls || VerifyOops) return 1000;
225 else {
226 const int slop = 2*BytesPerInstWord; // sethi;add (needed for long offsets)
227 if (is_vtable_stub) {
228 // ld;ld;ld,jmp,nop
229 const int basic = 5*BytesPerInstWord +
230 // shift;add for load_klass (only shift with zero heap based)
231 (UseCompressedClassPointers ?
232 MacroAssembler::instr_size_for_decode_klass_not_null() : 0);
233 return basic + slop;
234 } else {
235 const int basic = (28 LP64_ONLY(+ 6)) * BytesPerInstWord +
236 // shift;add for load_klass (only shift with zero heap based)
237 (UseCompressedClassPointers ?
238 MacroAssembler::instr_size_for_decode_klass_not_null() : 0);
239 return (basic + slop);
240 }
241 }
242
243 // In order to tune these parameters, run the JVM with VM options
244 // +PrintMiscellaneous and +WizardMode to see information about
245 // actual itable stubs. Look for lines like this:
246 // itable #1 at 0x5551212[116] left over: 8
247 // Reduce the constants so that the "left over" number is 8
248 // Do not aim at a left-over number of zero, because a very
249 // large vtable or itable offset (> 4K) will require an extra
250 // sethi/or pair of instructions.
251 //
252 // The JVM98 app. _202_jess has a megamorphic interface call.
253 // The itable code looks like this:
254 // Decoding VtableStub itbl[1]@16
255 // ld [ %o0 + 4 ], %g3
256 // save %sp, -64, %sp
257 // ld [ %g3 + 0xe8 ], %l2
258 // sll %l2, 2, %l2
259 // add %l2, 0x134, %l2
260 // and %l2, -8, %l2 ! NOT_LP64 only
261 // add %g3, %l2, %l2
262 // add %g3, 4, %g3
263 // ld [ %l2 ], %l5
264 // brz,pn %l5, throw_icce
265 // cmp %l5, %g5
266 // be %icc, success
267 // add %l2, 8, %l2
268 // loop:
269 // ld [ %l2 ], %l5
270 // brz,pn %l5, throw_icce
271 // cmp %l5, %g5
272 // bne,pn %icc, loop
273 // add %l2, 8, %l2
274 // success:
275 // ld [ %l2 + -4 ], %l2
276 // ld [ %g3 + %l2 ], %l5
277 // restore %l5, 0, %g5
278 // ld [ %g5 + 0x44 ], %g3
279 // jmp %g3
280 // nop
281 // throw_icce:
282 // sethi %hi(throw_ICCE_entry), %g3
283 // ! 5 more instructions here, LP64_ONLY
284 // jmp %g3 + %lo(throw_ICCE_entry)
285 // restore
286 }
287
288
289 int VtableStub::pd_code_alignment() {
290 // UltraSPARC cache line size is 8 instructions:
291 const unsigned int icache_line_size = 32;
292 return icache_line_size;
293 }

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