Mercurial > hg > truffle
annotate src/cpu/sparc/vm/vtableStubs_sparc.cpp @ 709:1d037ecd7960
6827505: sizing logic for vtable and itable stubs needs self-check
Summary: Asserts and comments to help maintain the correct sizing of certain stubs
Reviewed-by: kvn
| author | jrose |
|---|---|
| date | Wed, 08 Apr 2009 00:12:59 -0700 |
| parents | 660978a2a31a |
| children | 6b2273dd6fa9 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 196 | 2 * Copyright 1997-2008 Sun Microsystems, Inc. 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 * | |
| 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(); | |
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63 __ load_klass(O0, G3_scratch); |
| 0 | 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(); | |
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109 |
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110 if (PrintMiscellaneous && (WizardMode || Verbose)) { |
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111 tty->print_cr("vtable #%d at "PTR_FORMAT"[%d] left over: %d", |
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112 vtable_index, s->entry_point(), |
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113 (int)(s->code_end() - s->entry_point()), |
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114 (int)(s->code_end() - __ pc())); |
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115 } |
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116 guarantee(__ pc() <= s->code_end(), "overflowed buffer"); |
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117 // shut the door on sizing bugs |
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118 int slop = 2*BytesPerInstWord; // 32-bit offset is this much larger than a 13-bit one |
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119 assert(vtable_index > 10 || __ pc() + slop <= s->code_end(), "room for sethi;add"); |
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120 |
| 0 | 121 s->set_exception_points(npe_addr, ame_addr); |
| 122 return s; | |
| 123 } | |
| 124 | |
| 125 | |
| 126 // NOTE: %%%% if any change is made to this stub make sure that the function | |
| 127 // pd_code_size_limit is changed to ensure the correct size for VtableStub | |
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128 VtableStub* VtableStubs::create_itable_stub(int itable_index) { |
| 0 | 129 const int sparc_code_length = VtableStub::pd_code_size_limit(false); |
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130 VtableStub* s = new(sparc_code_length) VtableStub(false, itable_index); |
| 0 | 131 ResourceMark rm; |
| 132 CodeBuffer cb(s->entry_point(), sparc_code_length); | |
| 133 MacroAssembler* masm = new MacroAssembler(&cb); | |
| 134 | |
| 135 Register G3_klassOop = G3_scratch; | |
| 136 Register G5_interface = G5; // Passed in as an argument | |
| 137 Label search; | |
| 138 | |
| 139 // Entry arguments: | |
| 140 // G5_interface: Interface | |
| 141 // O0: Receiver | |
| 142 assert(VtableStub::receiver_location() == O0->as_VMReg(), "receiver expected in O0"); | |
| 143 | |
| 144 // get receiver klass (also an implicit null-check) | |
| 145 address npe_addr = __ pc(); | |
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146 __ load_klass(O0, G3_klassOop); |
| 0 | 147 __ verify_oop(G3_klassOop); |
| 148 | |
| 149 // Push a new window to get some temp registers. This chops the head of all | |
| 150 // my 64-bit %o registers in the LION build, but this is OK because no longs | |
| 151 // are passed in the %o registers. Instead, longs are passed in G1 and G4 | |
| 152 // and so those registers are not available here. | |
| 153 __ save(SP,-frame::register_save_words*wordSize,SP); | |
| 154 | |
| 155 #ifndef PRODUCT | |
| 156 if (CountCompiledCalls) { | |
| 157 Address ctr(L0, SharedRuntime::nof_megamorphic_calls_addr()); | |
| 158 __ sethi(ctr); | |
| 159 __ ld(ctr, L1); | |
| 160 __ inc(L1); | |
| 161 __ st(L1, ctr); | |
| 162 } | |
| 163 #endif /* PRODUCT */ | |
| 164 | |
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165 Label throw_icce; |
| 0 | 166 |
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167 Register L5_method = L5; |
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168 __ lookup_interface_method(// inputs: rec. class, interface, itable index |
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169 G3_klassOop, G5_interface, itable_index, |
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170 // outputs: method, scan temp. reg |
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171 L5_method, L2, L3, |
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172 throw_icce); |
| 0 | 173 |
| 174 #ifndef PRODUCT | |
| 175 if (DebugVtables) { | |
| 176 Label L01; | |
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177 __ bpr(Assembler::rc_nz, false, Assembler::pt, L5_method, L01); |
| 0 | 178 __ delayed()->nop(); |
| 179 __ stop("methodOop is null"); | |
| 180 __ bind(L01); | |
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181 __ verify_oop(L5_method); |
| 0 | 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 | |
| 192 __ ld_ptr(G5_method, in_bytes(methodOopDesc::from_compiled_offset()), G3_scratch); | |
| 193 | |
| 194 // G5_method: methodOop | |
| 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); |
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201 Address icce(G3_scratch, StubRoutines::throw_IncompatibleClassChangeError_entry()); |
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202 __ jump_to(icce, 0); |
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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 (UseCompressedOops ? |
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232 ((Universe::narrow_oop_base() == NULL) ? BytesPerInstWord : 2*BytesPerInstWord) : 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 (UseCompressedOops ? |
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238 ((Universe::narrow_oop_base() == NULL) ? BytesPerInstWord : 2*BytesPerInstWord) : 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 } |