1 /*
2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 #include "incls/_precompiled.incl"
26 #include "incls/_vtableStubs_sparc.cpp.incl"
27
28 // machine-dependent part of VtableStubs: create vtableStub of correct size and
29 // initialize its code
30
31 #define __ masm->
32
33
34 #ifndef PRODUCT
35 extern "C" void bad_compiled_vtable_index(JavaThread* thread, oopDesc* receiver, int index);
36 #endif
37
38
39 // Used by compiler only; may use only caller saved, non-argument registers
40 // NOTE: %%%% if any change is made to this stub make sure that the function
41 // pd_code_size_limit is changed to ensure the correct size for VtableStub
42 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
43 const int sparc_code_length = VtableStub::pd_code_size_limit(true);
44 VtableStub* s = new(sparc_code_length) VtableStub(true, vtable_index);
45 ResourceMark rm;
46 CodeBuffer cb(s->entry_point(), sparc_code_length);
47 MacroAssembler* masm = new MacroAssembler(&cb);
48
49 #ifndef PRODUCT
50 if (CountCompiledCalls) {
51 Address ctr(G5, SharedRuntime::nof_megamorphic_calls_addr());
52 __ sethi(ctr);
53 __ ld(ctr, G3_scratch);
54 __ inc(G3_scratch);
55 __ st(G3_scratch, ctr);
56 }
57 #endif /* PRODUCT */
58
59 assert(VtableStub::receiver_location() == O0->as_VMReg(), "receiver expected in O0");
60
61 // get receiver klass
62 address npe_addr = __ pc();
63 __ load_klass(O0, G3_scratch);
64
65 // set methodOop (in case of interpreted method), and destination address
66 int entry_offset = instanceKlass::vtable_start_offset() + vtable_index*vtableEntry::size();
67 #ifndef PRODUCT
68 if (DebugVtables) {
69 Label L;
70 // check offset vs vtable length
71 __ ld(G3_scratch, instanceKlass::vtable_length_offset()*wordSize, G5);
72 __ cmp(G5, vtable_index*vtableEntry::size());
73 __ br(Assembler::greaterUnsigned, false, Assembler::pt, L);
74 __ delayed()->nop();
75 __ set(vtable_index, O2);
76 __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), O0, O2);
77 __ bind(L);
78 }
79 #endif
80 int v_off = entry_offset*wordSize + vtableEntry::method_offset_in_bytes();
81 if( __ is_simm13(v_off) ) {
82 __ ld_ptr(G3, v_off, G5_method);
83 } else {
84 __ set(v_off,G5);
85 __ ld_ptr(G3, G5, G5_method);
86 }
87
88 #ifndef PRODUCT
89 if (DebugVtables) {
90 Label L;
91 __ br_notnull(G5_method, false, Assembler::pt, L);
92 __ delayed()->nop();
93 __ stop("Vtable entry is ZERO");
94 __ bind(L);
95 }
96 #endif
97
98 address ame_addr = __ pc(); // if the vtable entry is null, the method is abstract
99 // NOTE: for vtable dispatches, the vtable entry will never be null.
100
101 __ ld_ptr(G5_method, in_bytes(methodOopDesc::from_compiled_offset()), G3_scratch);
102
103 // jump to target (either compiled code or c2iadapter)
104 __ JMP(G3_scratch, 0);
105 // load methodOop (in case we call c2iadapter)
106 __ delayed()->nop();
107
108 masm->flush();
109 s->set_exception_points(npe_addr, ame_addr);
110 return s;
111 }
112
113
114 // NOTE: %%%% if any change is made to this stub make sure that the function
115 // pd_code_size_limit is changed to ensure the correct size for VtableStub
116 VtableStub* VtableStubs::create_itable_stub(int vtable_index) {
117 const int sparc_code_length = VtableStub::pd_code_size_limit(false);
118 VtableStub* s = new(sparc_code_length) VtableStub(false, vtable_index);
119 ResourceMark rm;
120 CodeBuffer cb(s->entry_point(), sparc_code_length);
121 MacroAssembler* masm = new MacroAssembler(&cb);
122
123 Register G3_klassOop = G3_scratch;
124 Register G5_interface = G5; // Passed in as an argument
125 Label search;
126
127 // Entry arguments:
128 // G5_interface: Interface
129 // O0: Receiver
130 assert(VtableStub::receiver_location() == O0->as_VMReg(), "receiver expected in O0");
131
132 // get receiver klass (also an implicit null-check)
133 address npe_addr = __ pc();
134 __ load_klass(O0, G3_klassOop);
135 __ verify_oop(G3_klassOop);
136
137 // Push a new window to get some temp registers. This chops the head of all
138 // my 64-bit %o registers in the LION build, but this is OK because no longs
139 // are passed in the %o registers. Instead, longs are passed in G1 and G4
140 // and so those registers are not available here.
141 __ save(SP,-frame::register_save_words*wordSize,SP);
142 Register I0_receiver = I0; // Location of receiver after save
143
144 #ifndef PRODUCT
145 if (CountCompiledCalls) {
146 Address ctr(L0, SharedRuntime::nof_megamorphic_calls_addr());
147 __ sethi(ctr);
148 __ ld(ctr, L1);
149 __ inc(L1);
150 __ st(L1, ctr);
151 }
152 #endif /* PRODUCT */
153
154 // load start of itable entries into L0 register
155 const int base = instanceKlass::vtable_start_offset() * wordSize;
156 __ ld(Address(G3_klassOop, 0, instanceKlass::vtable_length_offset() * wordSize), L0);
157
158 // %%% Could store the aligned, prescaled offset in the klassoop.
159 __ sll(L0, exact_log2(vtableEntry::size() * wordSize), L0);
160 // see code for instanceKlass::start_of_itable!
161 const int vtable_alignment = align_object_offset(1);
162 assert(vtable_alignment == 1 || vtable_alignment == 2, "");
163 const int odd_bit = vtableEntry::size() * wordSize;
164 if (vtable_alignment == 2) {
165 __ and3(L0, odd_bit, L1); // isolate the odd bit
166 }
167 __ add(G3_klassOop, L0, L0);
168 if (vtable_alignment == 2) {
169 __ add(L0, L1, L0); // double the odd bit, to align up
170 }
171
172 // Loop over all itable entries until desired interfaceOop (G5_interface) found
173 __ bind(search);
174
175 // %%%% Could load both offset and interface in one ldx, if they were
176 // in the opposite order. This would save a load.
177 __ ld_ptr(L0, base + itableOffsetEntry::interface_offset_in_bytes(), L1);
178
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 Label throw_icce;
182 __ bpr(Assembler::rc_z, false, Assembler::pn, L1, throw_icce);
183 __ delayed()->cmp(G5_interface, L1);
184 __ brx(Assembler::notEqual, true, Assembler::pn, search);
185 __ delayed()->add(L0, itableOffsetEntry::size() * wordSize, L0);
186
187 // entry found and L0 points to it, move offset of vtable for interface into L0
188 __ ld(L0, base + itableOffsetEntry::offset_offset_in_bytes(), L0);
189
190 // Compute itableMethodEntry and get methodOop(G5_method) and entrypoint(L0) for compiler
191 const int method_offset = (itableMethodEntry::size() * wordSize * vtable_index) + itableMethodEntry::method_offset_in_bytes();
192 __ add(G3_klassOop, L0, L1);
193 if (__ is_simm13(method_offset)) {
194 __ ld_ptr(L1, method_offset, G5_method);
195 } else {
196 __ set(method_offset, G5_method);
197 __ ld_ptr(L1, G5_method, G5_method);
198 }
199
200 #ifndef PRODUCT
201 if (DebugVtables) {
202 Label L01;
203 __ bpr(Assembler::rc_nz, false, Assembler::pt, G5_method, L01);
204 __ delayed()->nop();
205 __ stop("methodOop is null");
206 __ bind(L01);
207 __ verify_oop(G5_method);
208 }
209 #endif
210
211 // If the following load is through a NULL pointer, we'll take an OS
212 // exception that should translate into an AbstractMethodError. We need the
213 // window count to be correct at that time.
214 __ restore(); // Restore registers BEFORE the AME point
215
216 address ame_addr = __ pc(); // if the vtable entry is null, the method is abstract
217 __ ld_ptr(G5_method, in_bytes(methodOopDesc::from_compiled_offset()), G3_scratch);
218
219 // G5_method: methodOop
220 // O0: Receiver
221 // G3_scratch: entry point
222 __ JMP(G3_scratch, 0);
223 __ delayed()->nop();
224
225 __ bind(throw_icce);
226 Address icce(G3_scratch, StubRoutines::throw_IncompatibleClassChangeError_entry());
227 __ jump_to(icce, 0);
228 __ delayed()->restore();
229
230 masm->flush();
231
232 guarantee(__ pc() <= s->code_end(), "overflowed buffer");
233
234 s->set_exception_points(npe_addr, ame_addr);
235 return s;
236 }
237
238
239 int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
240 if (TraceJumps || DebugVtables || CountCompiledCalls || VerifyOops) return 1000;
241 else {
242 const int slop = 2*BytesPerInstWord; // sethi;add (needed for long offsets)
243 if (is_vtable_stub) {
244 // ld;ld;ld,jmp,nop
245 const int basic = 5*BytesPerInstWord +
246 // shift;add for load_klass
247 (UseCompressedOops ? 2*BytesPerInstWord : 0);
248 return basic + slop;
249 } else {
250 // save, ld, ld, sll, and, add, add, ld, cmp, br, add, ld, add, ld, ld, jmp, restore, sethi, jmpl, restore
251 const int basic = (22 LP64_ONLY(+ 12)) * BytesPerInstWord +
252 // shift;add for load_klass
253 (UseCompressedOops ? 2*BytesPerInstWord : 0);
254 return (basic + slop);
255 }
256 }
257 }
258
259
260 int VtableStub::pd_code_alignment() {
261 // UltraSPARC cache line size is 8 instructions:
262 const unsigned int icache_line_size = 32;
263 return icache_line_size;
264 }