Mercurial > hg > truffle
annotate src/cpu/sparc/vm/vtableStubs_sparc.cpp @ 7198:6ab62ad83507
8003195: AbstractAssembler should not store code pointers but use the CodeSection directly
Reviewed-by: twisti, kvn
Contributed-by: Bharadwaj Yadavalli <bharadwaj.yadavalli@oracle.com>
author | twisti |
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date | Fri, 30 Nov 2012 11:44:05 -0800 |
parents | 8e47bac5643a |
children | f0c2369fda5a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 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 | |
0 | 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) { | |
727 | 62 __ inc_counter(SharedRuntime::nof_megamorphic_calls_addr(), G5, G3_scratch); |
0 | 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(); | |
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70 __ load_klass(O0, G3_scratch); |
0 | 71 |
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72 // set Method* (in case of interpreted method), and destination address |
0 | 73 #ifndef PRODUCT |
74 if (DebugVtables) { | |
75 Label L; | |
76 // check offset vs vtable length | |
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77 __ ld(G3_scratch, InstanceKlass::vtable_length_offset()*wordSize, G5); |
3839 | 78 __ cmp_and_br_short(G5, vtable_index*vtableEntry::size(), Assembler::greaterUnsigned, Assembler::pt, L); |
0 | 79 __ set(vtable_index, O2); |
80 __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), O0, O2); | |
81 __ bind(L); | |
82 } | |
83 #endif | |
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84 |
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85 __ lookup_virtual_method(G3_scratch, vtable_index, G5_method); |
0 | 86 |
87 #ifndef PRODUCT | |
88 if (DebugVtables) { | |
89 Label L; | |
3839 | 90 __ br_notnull_short(G5_method, Assembler::pt, L); |
0 | 91 __ stop("Vtable entry is ZERO"); |
92 __ bind(L); | |
93 } | |
94 #endif | |
95 | |
96 address ame_addr = __ pc(); // if the vtable entry is null, the method is abstract | |
97 // NOTE: for vtable dispatches, the vtable entry will never be null. | |
98 | |
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99 __ ld_ptr(G5_method, in_bytes(Method::from_compiled_offset()), G3_scratch); |
0 | 100 |
101 // jump to target (either compiled code or c2iadapter) | |
102 __ JMP(G3_scratch, 0); | |
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103 // load Method* (in case we call c2iadapter) |
0 | 104 __ delayed()->nop(); |
105 | |
106 masm->flush(); | |
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107 |
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108 if (PrintMiscellaneous && (WizardMode || Verbose)) { |
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109 tty->print_cr("vtable #%d at "PTR_FORMAT"[%d] left over: %d", |
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110 vtable_index, s->entry_point(), |
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111 (int)(s->code_end() - s->entry_point()), |
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112 (int)(s->code_end() - __ pc())); |
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113 } |
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114 guarantee(__ pc() <= s->code_end(), "overflowed buffer"); |
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115 // shut the door on sizing bugs |
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116 int slop = 2*BytesPerInstWord; // 32-bit offset is this much larger than a 13-bit one |
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117 assert(vtable_index > 10 || __ pc() + slop <= s->code_end(), "room for sethi;add"); |
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118 |
0 | 119 s->set_exception_points(npe_addr, ame_addr); |
120 return s; | |
121 } | |
122 | |
123 | |
124 // NOTE: %%%% if any change is made to this stub make sure that the function | |
125 // pd_code_size_limit is changed to ensure the correct size for VtableStub | |
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126 VtableStub* VtableStubs::create_itable_stub(int itable_index) { |
0 | 127 const int sparc_code_length = VtableStub::pd_code_size_limit(false); |
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128 VtableStub* s = new(sparc_code_length) VtableStub(false, itable_index); |
0 | 129 ResourceMark rm; |
130 CodeBuffer cb(s->entry_point(), sparc_code_length); | |
131 MacroAssembler* masm = new MacroAssembler(&cb); | |
132 | |
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133 Register G3_Klass = G3_scratch; |
0 | 134 Register G5_interface = G5; // Passed in as an argument |
135 Label search; | |
136 | |
137 // Entry arguments: | |
138 // G5_interface: Interface | |
139 // O0: Receiver | |
140 assert(VtableStub::receiver_location() == O0->as_VMReg(), "receiver expected in O0"); | |
141 | |
142 // get receiver klass (also an implicit null-check) | |
143 address npe_addr = __ pc(); | |
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144 __ load_klass(O0, G3_Klass); |
0 | 145 |
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); | |
151 | |
152 #ifndef PRODUCT | |
153 if (CountCompiledCalls) { | |
727 | 154 __ inc_counter(SharedRuntime::nof_megamorphic_calls_addr(), L0, L1); |
0 | 155 } |
156 #endif /* PRODUCT */ | |
157 | |
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158 Label throw_icce; |
0 | 159 |
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160 Register L5_method = L5; |
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161 __ lookup_interface_method(// inputs: rec. class, interface, itable index |
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162 G3_Klass, G5_interface, itable_index, |
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163 // outputs: method, scan temp. reg |
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164 L5_method, L2, L3, |
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165 throw_icce); |
0 | 166 |
167 #ifndef PRODUCT | |
168 if (DebugVtables) { | |
169 Label L01; | |
3839 | 170 __ br_notnull_short(L5_method, Assembler::pt, L01); |
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171 __ stop("Method* is null"); |
0 | 172 __ bind(L01); |
173 } | |
174 #endif | |
175 | |
176 // If the following load is through a NULL pointer, we'll take an OS | |
177 // exception that should translate into an AbstractMethodError. We need the | |
178 // window count to be correct at that time. | |
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179 __ restore(L5_method, 0, G5_method); |
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180 // Restore registers *before* the AME point. |
0 | 181 |
182 address ame_addr = __ pc(); // if the vtable entry is null, the method is abstract | |
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183 __ ld_ptr(G5_method, in_bytes(Method::from_compiled_offset()), G3_scratch); |
0 | 184 |
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185 // G5_method: Method* |
0 | 186 // O0: Receiver |
187 // G3_scratch: entry point | |
188 __ JMP(G3_scratch, 0); | |
189 __ delayed()->nop(); | |
190 | |
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191 __ bind(throw_icce); |
727 | 192 AddressLiteral icce(StubRoutines::throw_IncompatibleClassChangeError_entry()); |
193 __ jump_to(icce, G3_scratch); | |
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194 __ delayed()->restore(); |
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195 |
0 | 196 masm->flush(); |
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197 |
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198 if (PrintMiscellaneous && (WizardMode || Verbose)) { |
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199 tty->print_cr("itable #%d at "PTR_FORMAT"[%d] left over: %d", |
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200 itable_index, s->entry_point(), |
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201 (int)(s->code_end() - s->entry_point()), |
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202 (int)(s->code_end() - __ pc())); |
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203 } |
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204 guarantee(__ pc() <= s->code_end(), "overflowed buffer"); |
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205 // shut the door on sizing bugs |
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206 int slop = 2*BytesPerInstWord; // 32-bit offset is this much larger than a 13-bit one |
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207 assert(itable_index > 10 || __ pc() + slop <= s->code_end(), "room for sethi;add"); |
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208 |
0 | 209 s->set_exception_points(npe_addr, ame_addr); |
210 return s; | |
211 } | |
212 | |
213 | |
214 int VtableStub::pd_code_size_limit(bool is_vtable_stub) { | |
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215 if (TraceJumps || DebugVtables || CountCompiledCalls || VerifyOops) return 1000; |
0 | 216 else { |
217 const int slop = 2*BytesPerInstWord; // sethi;add (needed for long offsets) | |
218 if (is_vtable_stub) { | |
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219 // ld;ld;ld,jmp,nop |
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220 const int basic = 5*BytesPerInstWord + |
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221 // shift;add for load_klass (only shift with zero heap based) |
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222 (UseCompressedKlassPointers ? |
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223 ((Universe::narrow_klass_base() == NULL) ? BytesPerInstWord : 2*BytesPerInstWord) : 0); |
0 | 224 return basic + slop; |
225 } else { | |
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226 const int basic = (28 LP64_ONLY(+ 6)) * BytesPerInstWord + |
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227 // shift;add for load_klass (only shift with zero heap based) |
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228 (UseCompressedKlassPointers ? |
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229 ((Universe::narrow_klass_base() == NULL) ? BytesPerInstWord : 2*BytesPerInstWord) : 0); |
0 | 230 return (basic + slop); |
231 } | |
232 } | |
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233 |
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234 // In order to tune these parameters, run the JVM with VM options |
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235 // +PrintMiscellaneous and +WizardMode to see information about |
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236 // actual itable stubs. Look for lines like this: |
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237 // itable #1 at 0x5551212[116] left over: 8 |
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238 // Reduce the constants so that the "left over" number is 8 |
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239 // Do not aim at a left-over number of zero, because a very |
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240 // large vtable or itable offset (> 4K) will require an extra |
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241 // sethi/or pair of instructions. |
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242 // |
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243 // The JVM98 app. _202_jess has a megamorphic interface call. |
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244 // The itable code looks like this: |
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245 // Decoding VtableStub itbl[1]@16 |
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246 // ld [ %o0 + 4 ], %g3 |
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247 // save %sp, -64, %sp |
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248 // ld [ %g3 + 0xe8 ], %l2 |
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249 // sll %l2, 2, %l2 |
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250 // add %l2, 0x134, %l2 |
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251 // and %l2, -8, %l2 ! NOT_LP64 only |
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252 // add %g3, %l2, %l2 |
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253 // add %g3, 4, %g3 |
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254 // ld [ %l2 ], %l5 |
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255 // brz,pn %l5, throw_icce |
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256 // cmp %l5, %g5 |
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257 // be %icc, success |
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258 // add %l2, 8, %l2 |
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259 // loop: |
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260 // ld [ %l2 ], %l5 |
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261 // brz,pn %l5, throw_icce |
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262 // cmp %l5, %g5 |
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263 // bne,pn %icc, loop |
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264 // add %l2, 8, %l2 |
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265 // success: |
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266 // ld [ %l2 + -4 ], %l2 |
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267 // ld [ %g3 + %l2 ], %l5 |
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268 // restore %l5, 0, %g5 |
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269 // ld [ %g5 + 0x44 ], %g3 |
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270 // jmp %g3 |
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271 // nop |
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272 // throw_icce: |
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273 // sethi %hi(throw_ICCE_entry), %g3 |
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274 // ! 5 more instructions here, LP64_ONLY |
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275 // jmp %g3 + %lo(throw_ICCE_entry) |
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276 // restore |
0 | 277 } |
278 | |
279 | |
280 int VtableStub::pd_code_alignment() { | |
281 // UltraSPARC cache line size is 8 instructions: | |
282 const unsigned int icache_line_size = 32; | |
283 return icache_line_size; | |
284 } |