Thu, 12 Mar 2009 10:37:46 -0700
6791178: Specialize for zero as the compressed oop vm heap base
Summary: Use zero based compressed oops if java heap is below 32gb and unscaled compressed oops if java heap is below 4gb.
Reviewed-by: never, twisti, jcoomes, coleenp
1 /*
2 * Copyright 1997-2008 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 */
25 #include "incls/_precompiled.incl"
26 #include "incls/_vtableStubs_sparc.cpp.incl"
28 // machine-dependent part of VtableStubs: create vtableStub of correct size and
29 // initialize its code
31 #define __ masm->
34 #ifndef PRODUCT
35 extern "C" void bad_compiled_vtable_index(JavaThread* thread, oopDesc* receiver, int index);
36 #endif
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);
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 */
59 assert(VtableStub::receiver_location() == O0->as_VMReg(), "receiver expected in O0");
61 // get receiver klass
62 address npe_addr = __ pc();
63 __ load_klass(O0, G3_scratch);
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 }
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
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.
101 __ ld_ptr(G5_method, in_bytes(methodOopDesc::from_compiled_offset()), G3_scratch);
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();
108 masm->flush();
110 if (PrintMiscellaneous && (WizardMode || Verbose)) {
111 tty->print_cr("vtable #%d at "PTR_FORMAT"[%d] left over: %d",
112 vtable_index, s->entry_point(),
113 (int)(s->code_end() - s->entry_point()),
114 (int)(s->code_end() - __ pc()));
115 }
116 guarantee(__ pc() <= s->code_end(), "overflowed buffer");
118 s->set_exception_points(npe_addr, ame_addr);
119 return s;
120 }
123 // NOTE: %%%% if any change is made to this stub make sure that the function
124 // pd_code_size_limit is changed to ensure the correct size for VtableStub
125 VtableStub* VtableStubs::create_itable_stub(int itable_index) {
126 const int sparc_code_length = VtableStub::pd_code_size_limit(false);
127 VtableStub* s = new(sparc_code_length) VtableStub(false, itable_index);
128 ResourceMark rm;
129 CodeBuffer cb(s->entry_point(), sparc_code_length);
130 MacroAssembler* masm = new MacroAssembler(&cb);
132 Register G3_klassOop = G3_scratch;
133 Register G5_interface = G5; // Passed in as an argument
134 Label search;
136 // Entry arguments:
137 // G5_interface: Interface
138 // O0: Receiver
139 assert(VtableStub::receiver_location() == O0->as_VMReg(), "receiver expected in O0");
141 // get receiver klass (also an implicit null-check)
142 address npe_addr = __ pc();
143 __ load_klass(O0, G3_klassOop);
144 __ verify_oop(G3_klassOop);
146 // Push a new window to get some temp registers. This chops the head of all
147 // my 64-bit %o registers in the LION build, but this is OK because no longs
148 // are passed in the %o registers. Instead, longs are passed in G1 and G4
149 // and so those registers are not available here.
150 __ save(SP,-frame::register_save_words*wordSize,SP);
152 #ifndef PRODUCT
153 if (CountCompiledCalls) {
154 Address ctr(L0, SharedRuntime::nof_megamorphic_calls_addr());
155 __ sethi(ctr);
156 __ ld(ctr, L1);
157 __ inc(L1);
158 __ st(L1, ctr);
159 }
160 #endif /* PRODUCT */
162 Label throw_icce;
164 Register L5_method = L5;
165 __ lookup_interface_method(// inputs: rec. class, interface, itable index
166 G3_klassOop, G5_interface, itable_index,
167 // outputs: method, scan temp. reg
168 L5_method, L2, L3,
169 throw_icce);
171 #ifndef PRODUCT
172 if (DebugVtables) {
173 Label L01;
174 __ bpr(Assembler::rc_nz, false, Assembler::pt, L5_method, L01);
175 __ delayed()->nop();
176 __ stop("methodOop is null");
177 __ bind(L01);
178 __ verify_oop(L5_method);
179 }
180 #endif
182 // If the following load is through a NULL pointer, we'll take an OS
183 // exception that should translate into an AbstractMethodError. We need the
184 // window count to be correct at that time.
185 __ restore(L5_method, 0, G5_method);
186 // Restore registers *before* the AME point.
188 address ame_addr = __ pc(); // if the vtable entry is null, the method is abstract
189 __ ld_ptr(G5_method, in_bytes(methodOopDesc::from_compiled_offset()), G3_scratch);
191 // G5_method: methodOop
192 // O0: Receiver
193 // G3_scratch: entry point
194 __ JMP(G3_scratch, 0);
195 __ delayed()->nop();
197 __ bind(throw_icce);
198 Address icce(G3_scratch, StubRoutines::throw_IncompatibleClassChangeError_entry());
199 __ jump_to(icce, 0);
200 __ delayed()->restore();
202 masm->flush();
204 if (PrintMiscellaneous && (WizardMode || Verbose)) {
205 tty->print_cr("itable #%d at "PTR_FORMAT"[%d] left over: %d",
206 itable_index, s->entry_point(),
207 (int)(s->code_end() - s->entry_point()),
208 (int)(s->code_end() - __ pc()));
209 }
210 guarantee(__ pc() <= s->code_end(), "overflowed buffer");
212 s->set_exception_points(npe_addr, ame_addr);
213 return s;
214 }
217 int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
218 if (TraceJumps || DebugVtables || CountCompiledCalls || VerifyOops) return 1000;
219 else {
220 const int slop = 2*BytesPerInstWord; // sethi;add (needed for long offsets)
221 if (is_vtable_stub) {
222 // ld;ld;ld,jmp,nop
223 const int basic = 5*BytesPerInstWord +
224 // shift;add for load_klass (only shift with zero heap based)
225 (UseCompressedOops ?
226 ((Universe::narrow_oop_base() == NULL) ? BytesPerInstWord : 2*BytesPerInstWord) : 0);
227 return basic + slop;
228 } else {
229 const int basic = (28 LP64_ONLY(+ 6)) * BytesPerInstWord +
230 // shift;add for load_klass (only shift with zero heap based)
231 (UseCompressedOops ?
232 ((Universe::narrow_oop_base() == NULL) ? BytesPerInstWord : 2*BytesPerInstWord) : 0);
233 return (basic + slop);
234 }
235 }
236 }
239 int VtableStub::pd_code_alignment() {
240 // UltraSPARC cache line size is 8 instructions:
241 const unsigned int icache_line_size = 32;
242 return icache_line_size;
243 }