Mercurial > hg > truffle
annotate src/cpu/sparc/vm/vtableStubs_sparc.cpp @ 20495:58925d1f325e
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Reviewed-by: brutisso, jwilhelm
author | mgerdin |
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date | Mon, 08 Sep 2014 17:47:43 +0200 |
parents | 891687731b59 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, 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" |
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26 #include "asm/macroAssembler.inline.hpp" |
1972 | 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 | |
0 | 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); | |
12294 | 55 // Can be NULL if there is no free space in the code cache. |
56 if (s == NULL) { | |
57 return NULL; | |
58 } | |
59 | |
0 | 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) { | |
727 | 66 __ inc_counter(SharedRuntime::nof_megamorphic_calls_addr(), G5, G3_scratch); |
0 | 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(); | |
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74 __ load_klass(O0, G3_scratch); |
0 | 75 |
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76 // set Method* (in case of interpreted method), and destination address |
0 | 77 #ifndef PRODUCT |
78 if (DebugVtables) { | |
79 Label L; | |
80 // check offset vs vtable length | |
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81 __ ld(G3_scratch, InstanceKlass::vtable_length_offset()*wordSize, G5); |
3839 | 82 __ cmp_and_br_short(G5, vtable_index*vtableEntry::size(), Assembler::greaterUnsigned, Assembler::pt, L); |
0 | 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 | |
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88 |
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89 __ lookup_virtual_method(G3_scratch, vtable_index, G5_method); |
0 | 90 |
91 #ifndef PRODUCT | |
92 if (DebugVtables) { | |
93 Label L; | |
3839 | 94 __ br_notnull_short(G5_method, Assembler::pt, L); |
0 | 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 | |
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103 __ ld_ptr(G5_method, in_bytes(Method::from_compiled_offset()), G3_scratch); |
0 | 104 |
105 // jump to target (either compiled code or c2iadapter) | |
106 __ JMP(G3_scratch, 0); | |
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107 // load Method* (in case we call c2iadapter) |
0 | 108 __ delayed()->nop(); |
109 | |
110 masm->flush(); | |
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111 |
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112 if (PrintMiscellaneous && (WizardMode || Verbose)) { |
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113 tty->print_cr("vtable #%d at "PTR_FORMAT"[%d] left over: %d", |
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114 vtable_index, s->entry_point(), |
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115 (int)(s->code_end() - s->entry_point()), |
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116 (int)(s->code_end() - __ pc())); |
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117 } |
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118 guarantee(__ pc() <= s->code_end(), "overflowed buffer"); |
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119 // shut the door on sizing bugs |
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120 int slop = 2*BytesPerInstWord; // 32-bit offset is this much larger than a 13-bit one |
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121 assert(vtable_index > 10 || __ pc() + slop <= s->code_end(), "room for sethi;add"); |
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122 |
0 | 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 | |
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130 VtableStub* VtableStubs::create_itable_stub(int itable_index) { |
0 | 131 const int sparc_code_length = VtableStub::pd_code_size_limit(false); |
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132 VtableStub* s = new(sparc_code_length) VtableStub(false, itable_index); |
12294 | 133 // Can be NULL if there is no free space in the code cache. |
134 if (s == NULL) { | |
135 return NULL; | |
136 } | |
137 | |
0 | 138 ResourceMark rm; |
139 CodeBuffer cb(s->entry_point(), sparc_code_length); | |
140 MacroAssembler* masm = new MacroAssembler(&cb); | |
141 | |
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142 Register G3_Klass = G3_scratch; |
0 | 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(); | |
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153 __ load_klass(O0, G3_Klass); |
0 | 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) { | |
727 | 163 __ inc_counter(SharedRuntime::nof_megamorphic_calls_addr(), L0, L1); |
0 | 164 } |
165 #endif /* PRODUCT */ | |
166 | |
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167 Label throw_icce; |
0 | 168 |
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169 Register L5_method = L5; |
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170 __ lookup_interface_method(// inputs: rec. class, interface, itable index |
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171 G3_Klass, G5_interface, itable_index, |
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172 // outputs: method, scan temp. reg |
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173 L5_method, L2, L3, |
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174 throw_icce); |
0 | 175 |
176 #ifndef PRODUCT | |
177 if (DebugVtables) { | |
178 Label L01; | |
3839 | 179 __ br_notnull_short(L5_method, Assembler::pt, L01); |
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180 __ stop("Method* is null"); |
0 | 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. | |
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188 __ restore(L5_method, 0, G5_method); |
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189 // Restore registers *before* the AME point. |
0 | 190 |
191 address ame_addr = __ pc(); // if the vtable entry is null, the method is abstract | |
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192 __ ld_ptr(G5_method, in_bytes(Method::from_compiled_offset()), G3_scratch); |
0 | 193 |
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194 // G5_method: Method* |
0 | 195 // O0: Receiver |
196 // G3_scratch: entry point | |
197 __ JMP(G3_scratch, 0); | |
198 __ delayed()->nop(); | |
199 | |
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200 __ bind(throw_icce); |
727 | 201 AddressLiteral icce(StubRoutines::throw_IncompatibleClassChangeError_entry()); |
202 __ jump_to(icce, G3_scratch); | |
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203 __ delayed()->restore(); |
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204 |
0 | 205 masm->flush(); |
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206 |
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207 if (PrintMiscellaneous && (WizardMode || Verbose)) { |
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208 tty->print_cr("itable #%d at "PTR_FORMAT"[%d] left over: %d", |
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209 itable_index, s->entry_point(), |
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210 (int)(s->code_end() - s->entry_point()), |
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211 (int)(s->code_end() - __ pc())); |
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212 } |
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213 guarantee(__ pc() <= s->code_end(), "overflowed buffer"); |
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214 // shut the door on sizing bugs |
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215 int slop = 2*BytesPerInstWord; // 32-bit offset is this much larger than a 13-bit one |
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216 assert(itable_index > 10 || __ pc() + slop <= s->code_end(), "room for sethi;add"); |
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217 |
0 | 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) { | |
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224 if (TraceJumps || DebugVtables || CountCompiledCalls || VerifyOops) return 1000; |
0 | 225 else { |
226 const int slop = 2*BytesPerInstWord; // sethi;add (needed for long offsets) | |
227 if (is_vtable_stub) { | |
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228 // ld;ld;ld,jmp,nop |
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229 const int basic = 5*BytesPerInstWord + |
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230 // shift;add for load_klass (only shift with zero heap based) |
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231 (UseCompressedClassPointers ? |
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232 MacroAssembler::instr_size_for_decode_klass_not_null() : 0); |
0 | 233 return basic + slop; |
234 } else { | |
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235 const int basic = (28 LP64_ONLY(+ 6)) * BytesPerInstWord + |
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236 // shift;add for load_klass (only shift with zero heap based) |
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237 (UseCompressedClassPointers ? |
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238 MacroAssembler::instr_size_for_decode_klass_not_null() : 0); |
0 | 239 return (basic + slop); |
240 } | |
241 } | |
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242 |
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243 // In order to tune these parameters, run the JVM with VM options |
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244 // +PrintMiscellaneous and +WizardMode to see information about |
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245 // actual itable stubs. Look for lines like this: |
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246 // itable #1 at 0x5551212[116] left over: 8 |
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247 // Reduce the constants so that the "left over" number is 8 |
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248 // Do not aim at a left-over number of zero, because a very |
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249 // large vtable or itable offset (> 4K) will require an extra |
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250 // sethi/or pair of instructions. |
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251 // |
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252 // The JVM98 app. _202_jess has a megamorphic interface call. |
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253 // The itable code looks like this: |
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254 // Decoding VtableStub itbl[1]@16 |
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255 // ld [ %o0 + 4 ], %g3 |
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256 // save %sp, -64, %sp |
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257 // ld [ %g3 + 0xe8 ], %l2 |
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258 // sll %l2, 2, %l2 |
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259 // add %l2, 0x134, %l2 |
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260 // and %l2, -8, %l2 ! NOT_LP64 only |
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261 // add %g3, %l2, %l2 |
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262 // add %g3, 4, %g3 |
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263 // ld [ %l2 ], %l5 |
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264 // brz,pn %l5, throw_icce |
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265 // cmp %l5, %g5 |
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266 // be %icc, success |
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267 // add %l2, 8, %l2 |
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268 // loop: |
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269 // ld [ %l2 ], %l5 |
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270 // brz,pn %l5, throw_icce |
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271 // cmp %l5, %g5 |
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272 // bne,pn %icc, loop |
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273 // add %l2, 8, %l2 |
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274 // success: |
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275 // ld [ %l2 + -4 ], %l2 |
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276 // ld [ %g3 + %l2 ], %l5 |
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277 // restore %l5, 0, %g5 |
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278 // ld [ %g5 + 0x44 ], %g3 |
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279 // jmp %g3 |
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280 // nop |
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281 // throw_icce: |
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282 // sethi %hi(throw_ICCE_entry), %g3 |
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283 // ! 5 more instructions here, LP64_ONLY |
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284 // jmp %g3 + %lo(throw_ICCE_entry) |
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285 // restore |
0 | 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 } |