Mercurial > hg > truffle
annotate src/cpu/x86/vm/c1_MacroAssembler_x86.cpp @ 4140:716a2c5c0656
Further reduce diff to HotSpot.
| author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
|---|---|
| date | Sun, 18 Dec 2011 01:01:34 +0100 |
| parents | b648304ba4ff |
| children | 33df1aeaebbf |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1999, 2011, 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 "c1/c1_MacroAssembler.hpp" | |
| 27 #include "c1/c1_Runtime1.hpp" | |
| 28 #include "classfile/systemDictionary.hpp" | |
| 29 #include "gc_interface/collectedHeap.hpp" | |
| 30 #include "interpreter/interpreter.hpp" | |
| 31 #include "oops/arrayOop.hpp" | |
| 32 #include "oops/markOop.hpp" | |
| 33 #include "runtime/basicLock.hpp" | |
| 34 #include "runtime/biasedLocking.hpp" | |
| 35 #include "runtime/os.hpp" | |
| 36 #include "runtime/stubRoutines.hpp" | |
| 0 | 37 |
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38 int C1_MacroAssembler::lock_object(Register hdr, Register obj, Register disp_hdr, Register scratch, Label& slow_case, bool use_basic_object_lock) { |
| 304 | 39 const int aligned_mask = BytesPerWord -1; |
| 0 | 40 const int hdr_offset = oopDesc::mark_offset_in_bytes(); |
| 41 assert(hdr == rax, "hdr must be rax, for the cmpxchg instruction"); | |
| 42 assert(hdr != obj && hdr != disp_hdr && obj != disp_hdr, "registers must be different"); | |
| 43 Label done; | |
| 44 int null_check_offset = -1; | |
| 45 | |
| 46 verify_oop(obj); | |
| 47 | |
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48 if (use_basic_object_lock) { |
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49 // save object being locked into the BasicObjectLock |
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50 movptr(Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes()), obj); |
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51 } |
| 0 | 52 |
| 53 if (UseBiasedLocking) { | |
| 54 assert(scratch != noreg, "should have scratch register at this point"); | |
| 55 null_check_offset = biased_locking_enter(disp_hdr, obj, hdr, scratch, false, done, &slow_case); | |
| 56 } else { | |
| 57 null_check_offset = offset(); | |
| 58 } | |
| 59 | |
| 60 // Load object header | |
| 304 | 61 movptr(hdr, Address(obj, hdr_offset)); |
| 0 | 62 // and mark it as unlocked |
| 304 | 63 orptr(hdr, markOopDesc::unlocked_value); |
| 0 | 64 // save unlocked object header into the displaced header location on the stack |
| 304 | 65 movptr(Address(disp_hdr, 0), hdr); |
| 0 | 66 // test if object header is still the same (i.e. unlocked), and if so, store the |
| 67 // displaced header address in the object header - if it is not the same, get the | |
| 68 // object header instead | |
| 69 if (os::is_MP()) MacroAssembler::lock(); // must be immediately before cmpxchg! | |
| 304 | 70 cmpxchgptr(disp_hdr, Address(obj, hdr_offset)); |
| 0 | 71 // if the object header was the same, we're done |
| 72 if (PrintBiasedLockingStatistics) { | |
| 73 cond_inc32(Assembler::equal, | |
| 74 ExternalAddress((address)BiasedLocking::fast_path_entry_count_addr())); | |
| 75 } | |
| 76 jcc(Assembler::equal, done); | |
| 77 // if the object header was not the same, it is now in the hdr register | |
| 78 // => test if it is a stack pointer into the same stack (recursive locking), i.e.: | |
| 79 // | |
| 80 // 1) (hdr & aligned_mask) == 0 | |
| 81 // 2) rsp <= hdr | |
| 82 // 3) hdr <= rsp + page_size | |
| 83 // | |
| 84 // these 3 tests can be done by evaluating the following expression: | |
| 85 // | |
| 86 // (hdr - rsp) & (aligned_mask - page_size) | |
| 87 // | |
| 88 // assuming both the stack pointer and page_size have their least | |
| 89 // significant 2 bits cleared and page_size is a power of 2 | |
| 304 | 90 subptr(hdr, rsp); |
| 91 andptr(hdr, aligned_mask - os::vm_page_size()); | |
| 0 | 92 // for recursive locking, the result is zero => save it in the displaced header |
| 93 // location (NULL in the displaced hdr location indicates recursive locking) | |
| 304 | 94 movptr(Address(disp_hdr, 0), hdr); |
| 0 | 95 // otherwise we don't care about the result and handle locking via runtime call |
| 96 jcc(Assembler::notZero, slow_case); | |
| 97 // done | |
| 98 bind(done); | |
| 99 return null_check_offset; | |
| 100 } | |
| 101 | |
| 102 | |
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103 void C1_MacroAssembler::unlock_object(Register hdr, Register obj, Register disp_hdr, Label& slow_case, bool use_basic_object_lock) { |
| 304 | 104 const int aligned_mask = BytesPerWord -1; |
| 0 | 105 const int hdr_offset = oopDesc::mark_offset_in_bytes(); |
| 106 assert(disp_hdr == rax, "disp_hdr must be rax, for the cmpxchg instruction"); | |
| 107 assert(hdr != obj && hdr != disp_hdr && obj != disp_hdr, "registers must be different"); | |
| 108 Label done; | |
| 109 | |
| 110 if (UseBiasedLocking) { | |
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111 if (use_basic_object_lock) { |
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112 // load object |
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113 movptr(obj, Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes())); |
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parents:
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114 } |
| 0 | 115 biased_locking_exit(obj, hdr, done); |
| 116 } | |
| 117 | |
| 118 // load displaced header | |
| 304 | 119 movptr(hdr, Address(disp_hdr, 0)); |
| 0 | 120 // if the loaded hdr is NULL we had recursive locking |
| 304 | 121 testptr(hdr, hdr); |
| 0 | 122 // if we had recursive locking, we are done |
| 123 jcc(Assembler::zero, done); | |
| 124 if (!UseBiasedLocking) { | |
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parents:
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125 if (use_basic_object_lock) { |
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Christian Wimmer <christian.wimmer@oracle.com>
parents:
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126 // load object |
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parents:
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127 movptr(obj, Address(disp_hdr, BasicObjectLock::obj_offset_in_bytes())); |
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128 } |
| 0 | 129 } |
| 130 verify_oop(obj); | |
| 131 // test if object header is pointing to the displaced header, and if so, restore | |
| 132 // the displaced header in the object - if the object header is not pointing to | |
| 133 // the displaced header, get the object header instead | |
| 134 if (os::is_MP()) MacroAssembler::lock(); // must be immediately before cmpxchg! | |
| 304 | 135 cmpxchgptr(hdr, Address(obj, hdr_offset)); |
| 0 | 136 // if the object header was not pointing to the displaced header, |
| 137 // we do unlocking via runtime call | |
| 138 jcc(Assembler::notEqual, slow_case); | |
| 139 // done | |
| 140 bind(done); | |
| 141 } | |
| 142 | |
| 143 | |
| 144 // Defines obj, preserves var_size_in_bytes | |
| 145 void C1_MacroAssembler::try_allocate(Register obj, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2, Label& slow_case) { | |
| 146 if (UseTLAB) { | |
| 147 tlab_allocate(obj, var_size_in_bytes, con_size_in_bytes, t1, t2, slow_case); | |
| 148 } else { | |
| 149 eden_allocate(obj, var_size_in_bytes, con_size_in_bytes, t1, slow_case); | |
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150 incr_allocated_bytes(noreg, var_size_in_bytes, con_size_in_bytes, t1); |
| 0 | 151 } |
| 152 } | |
| 153 | |
| 154 | |
| 155 void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) { | |
| 156 assert_different_registers(obj, klass, len); | |
| 157 if (UseBiasedLocking && !len->is_valid()) { | |
| 158 assert_different_registers(obj, klass, len, t1, t2); | |
| 304 | 159 movptr(t1, Address(klass, Klass::prototype_header_offset_in_bytes() + klassOopDesc::klass_part_offset_in_bytes())); |
| 160 movptr(Address(obj, oopDesc::mark_offset_in_bytes()), t1); | |
| 0 | 161 } else { |
| 304 | 162 // This assumes that all prototype bits fit in an int32_t |
| 163 movptr(Address(obj, oopDesc::mark_offset_in_bytes ()), (int32_t)(intptr_t)markOopDesc::prototype()); | |
| 0 | 164 } |
| 2002 | 165 #ifdef _LP64 |
| 166 if (UseCompressedOops) { // Take care not to kill klass | |
| 167 movptr(t1, klass); | |
| 168 encode_heap_oop_not_null(t1); | |
| 169 movl(Address(obj, oopDesc::klass_offset_in_bytes()), t1); | |
| 170 } else | |
| 171 #endif | |
| 172 { | |
| 173 movptr(Address(obj, oopDesc::klass_offset_in_bytes()), klass); | |
| 174 } | |
| 0 | 175 |
| 176 if (len->is_valid()) { | |
| 177 movl(Address(obj, arrayOopDesc::length_offset_in_bytes()), len); | |
| 178 } | |
| 2002 | 179 #ifdef _LP64 |
| 180 else if (UseCompressedOops) { | |
| 181 xorptr(t1, t1); | |
| 182 store_klass_gap(obj, t1); | |
| 183 } | |
| 184 #endif | |
| 0 | 185 } |
| 186 | |
| 187 | |
| 188 // preserves obj, destroys len_in_bytes | |
| 189 void C1_MacroAssembler::initialize_body(Register obj, Register len_in_bytes, int hdr_size_in_bytes, Register t1) { | |
| 190 Label done; | |
| 191 assert(obj != len_in_bytes && obj != t1 && t1 != len_in_bytes, "registers must be different"); | |
| 192 assert((hdr_size_in_bytes & (BytesPerWord - 1)) == 0, "header size is not a multiple of BytesPerWord"); | |
| 193 Register index = len_in_bytes; | |
| 304 | 194 // index is positive and ptr sized |
| 195 subptr(index, hdr_size_in_bytes); | |
| 0 | 196 jcc(Assembler::zero, done); |
| 197 // initialize topmost word, divide index by 2, check if odd and test if zero | |
| 198 // note: for the remaining code to work, index must be a multiple of BytesPerWord | |
| 199 #ifdef ASSERT | |
| 200 { Label L; | |
| 304 | 201 testptr(index, BytesPerWord - 1); |
| 0 | 202 jcc(Assembler::zero, L); |
| 203 stop("index is not a multiple of BytesPerWord"); | |
| 204 bind(L); | |
| 205 } | |
| 206 #endif | |
| 304 | 207 xorptr(t1, t1); // use _zero reg to clear memory (shorter code) |
| 0 | 208 if (UseIncDec) { |
| 304 | 209 shrptr(index, 3); // divide by 8/16 and set carry flag if bit 2 was set |
| 0 | 210 } else { |
| 304 | 211 shrptr(index, 2); // use 2 instructions to avoid partial flag stall |
| 212 shrptr(index, 1); | |
| 0 | 213 } |
| 304 | 214 #ifndef _LP64 |
| 0 | 215 // index could have been not a multiple of 8 (i.e., bit 2 was set) |
| 216 { Label even; | |
| 217 // note: if index was a multiple of 8, than it cannot | |
| 218 // be 0 now otherwise it must have been 0 before | |
| 219 // => if it is even, we don't need to check for 0 again | |
| 220 jcc(Assembler::carryClear, even); | |
| 221 // clear topmost word (no jump needed if conditional assignment would work here) | |
| 304 | 222 movptr(Address(obj, index, Address::times_8, hdr_size_in_bytes - 0*BytesPerWord), t1); |
| 0 | 223 // index could be 0 now, need to check again |
| 224 jcc(Assembler::zero, done); | |
| 225 bind(even); | |
| 226 } | |
| 304 | 227 #endif // !_LP64 |
| 0 | 228 // initialize remaining object fields: rdx is a multiple of 2 now |
| 229 { Label loop; | |
| 230 bind(loop); | |
| 304 | 231 movptr(Address(obj, index, Address::times_8, hdr_size_in_bytes - 1*BytesPerWord), t1); |
| 232 NOT_LP64(movptr(Address(obj, index, Address::times_8, hdr_size_in_bytes - 2*BytesPerWord), t1);) | |
| 0 | 233 decrement(index); |
| 234 jcc(Assembler::notZero, loop); | |
| 235 } | |
| 236 | |
| 237 // done | |
| 238 bind(done); | |
| 239 } | |
| 240 | |
| 241 | |
| 242 void C1_MacroAssembler::allocate_object(Register obj, Register t1, Register t2, int header_size, int object_size, Register klass, Label& slow_case) { | |
| 243 assert(obj == rax, "obj must be in rax, for cmpxchg"); | |
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244 assert_different_registers(obj, t1, t2); // XXX really? |
| 0 | 245 assert(header_size >= 0 && object_size >= header_size, "illegal sizes"); |
| 246 | |
| 247 try_allocate(obj, noreg, object_size * BytesPerWord, t1, t2, slow_case); | |
| 248 | |
| 249 initialize_object(obj, klass, noreg, object_size * HeapWordSize, t1, t2); | |
| 250 } | |
| 251 | |
| 252 void C1_MacroAssembler::initialize_object(Register obj, Register klass, Register var_size_in_bytes, int con_size_in_bytes, Register t1, Register t2) { | |
| 253 assert((con_size_in_bytes & MinObjAlignmentInBytesMask) == 0, | |
| 254 "con_size_in_bytes is not multiple of alignment"); | |
| 2002 | 255 const int hdr_size_in_bytes = instanceOopDesc::header_size() * HeapWordSize; |
| 0 | 256 |
| 257 initialize_header(obj, klass, noreg, t1, t2); | |
| 258 | |
| 259 // clear rest of allocated space | |
| 260 const Register t1_zero = t1; | |
| 261 const Register index = t2; | |
| 262 const int threshold = 6 * BytesPerWord; // approximate break even point for code size (see comments below) | |
| 263 if (var_size_in_bytes != noreg) { | |
| 304 | 264 mov(index, var_size_in_bytes); |
| 0 | 265 initialize_body(obj, index, hdr_size_in_bytes, t1_zero); |
| 266 } else if (con_size_in_bytes <= threshold) { | |
| 267 // use explicit null stores | |
| 268 // code size = 2 + 3*n bytes (n = number of fields to clear) | |
| 304 | 269 xorptr(t1_zero, t1_zero); // use t1_zero reg to clear memory (shorter code) |
| 0 | 270 for (int i = hdr_size_in_bytes; i < con_size_in_bytes; i += BytesPerWord) |
| 304 | 271 movptr(Address(obj, i), t1_zero); |
| 0 | 272 } else if (con_size_in_bytes > hdr_size_in_bytes) { |
| 273 // use loop to null out the fields | |
| 274 // code size = 16 bytes for even n (n = number of fields to clear) | |
| 275 // initialize last object field first if odd number of fields | |
| 304 | 276 xorptr(t1_zero, t1_zero); // use t1_zero reg to clear memory (shorter code) |
| 277 movptr(index, (con_size_in_bytes - hdr_size_in_bytes) >> 3); | |
| 0 | 278 // initialize last object field if constant size is odd |
| 279 if (((con_size_in_bytes - hdr_size_in_bytes) & 4) != 0) | |
| 304 | 280 movptr(Address(obj, con_size_in_bytes - (1*BytesPerWord)), t1_zero); |
| 0 | 281 // initialize remaining object fields: rdx is a multiple of 2 |
| 282 { Label loop; | |
| 283 bind(loop); | |
| 304 | 284 movptr(Address(obj, index, Address::times_8, hdr_size_in_bytes - (1*BytesPerWord)), |
| 285 t1_zero); | |
| 286 NOT_LP64(movptr(Address(obj, index, Address::times_8, hdr_size_in_bytes - (2*BytesPerWord)), | |
| 287 t1_zero);) | |
| 0 | 288 decrement(index); |
| 289 jcc(Assembler::notZero, loop); | |
| 290 } | |
| 291 } | |
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292 |
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293 // (tw) fix me |
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294 // if (CURRENT_ENV->dtrace_alloc_probes()) { |
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295 // assert(obj == rax, "must be"); |
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296 // call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id))); |
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297 // } |
| 0 | 298 |
| 299 verify_oop(obj); | |
| 300 } | |
| 301 | |
| 302 void C1_MacroAssembler::allocate_array(Register obj, Register len, Register t1, Register t2, int header_size, Address::ScaleFactor f, Register klass, Label& slow_case) { | |
| 303 assert(obj == rax, "obj must be in rax, for cmpxchg"); | |
| 304 assert_different_registers(obj, len, t1, t2, klass); | |
| 305 | |
| 306 // determine alignment mask | |
| 304 | 307 assert(!(BytesPerWord & 1), "must be a multiple of 2 for masking code to work"); |
| 0 | 308 |
| 309 // check for negative or excessive length | |
| 304 | 310 cmpptr(len, (int32_t)max_array_allocation_length); |
| 0 | 311 jcc(Assembler::above, slow_case); |
| 312 | |
| 313 const Register arr_size = t2; // okay to be the same | |
| 314 // align object end | |
| 304 | 315 movptr(arr_size, (int32_t)header_size * BytesPerWord + MinObjAlignmentInBytesMask); |
| 316 lea(arr_size, Address(arr_size, len, f)); | |
| 317 andptr(arr_size, ~MinObjAlignmentInBytesMask); | |
| 0 | 318 |
| 319 try_allocate(obj, arr_size, 0, t1, t2, slow_case); | |
| 320 | |
| 321 initialize_header(obj, klass, len, t1, t2); | |
| 322 | |
| 323 // clear rest of allocated space | |
| 324 const Register len_zero = len; | |
| 325 initialize_body(obj, arr_size, header_size * BytesPerWord, len_zero); | |
| 326 | |
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327 // TODO(tw): Re-enable this code once Graal no longer uses this method. |
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328 // if (CURRENT_ENV->dtrace_alloc_probes()) { |
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329 // assert(obj == rax, "must be"); |
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330 // call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id))); |
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331 // } |
| 0 | 332 |
| 333 verify_oop(obj); | |
| 334 } | |
| 335 | |
| 336 | |
| 337 | |
| 338 void C1_MacroAssembler::inline_cache_check(Register receiver, Register iCache) { | |
| 339 verify_oop(receiver); | |
| 340 // explicit NULL check not needed since load from [klass_offset] causes a trap | |
| 341 // check against inline cache | |
| 342 assert(!MacroAssembler::needs_explicit_null_check(oopDesc::klass_offset_in_bytes()), "must add explicit null check"); | |
| 343 int start_offset = offset(); | |
| 2002 | 344 |
| 345 if (UseCompressedOops) { | |
| 346 load_klass(rscratch1, receiver); | |
| 347 cmpptr(rscratch1, iCache); | |
| 348 } else { | |
| 349 cmpptr(iCache, Address(receiver, oopDesc::klass_offset_in_bytes())); | |
| 350 } | |
| 0 | 351 // if icache check fails, then jump to runtime routine |
| 352 // Note: RECEIVER must still contain the receiver! | |
| 353 jump_cc(Assembler::notEqual, | |
| 354 RuntimeAddress(SharedRuntime::get_ic_miss_stub())); | |
| 304 | 355 const int ic_cmp_size = LP64_ONLY(10) NOT_LP64(9); |
| 2002 | 356 assert(UseCompressedOops || offset() - start_offset == ic_cmp_size, "check alignment in emit_method_entry"); |
| 0 | 357 } |
| 358 | |
| 359 | |
| 360 void C1_MacroAssembler::build_frame(int frame_size_in_bytes) { | |
| 361 // Make sure there is enough stack space for this method's activation. | |
| 362 // Note that we do this before doing an enter(). This matches the | |
| 363 // ordering of C2's stack overflow check / rsp decrement and allows | |
| 364 // the SharedRuntime stack overflow handling to be consistent | |
| 365 // between the two compilers. | |
| 366 generate_stack_overflow_check(frame_size_in_bytes); | |
| 367 | |
| 1295 | 368 push(rbp); |
| 0 | 369 #ifdef TIERED |
| 370 // c2 leaves fpu stack dirty. Clean it on entry | |
| 371 if (UseSSE < 2 ) { | |
| 372 empty_FPU_stack(); | |
| 373 } | |
| 374 #endif // TIERED | |
| 375 decrement(rsp, frame_size_in_bytes); // does not emit code for frame_size == 0 | |
| 376 } | |
| 377 | |
| 378 | |
| 1295 | 379 void C1_MacroAssembler::remove_frame(int frame_size_in_bytes) { |
| 380 increment(rsp, frame_size_in_bytes); // Does not emit code for frame_size == 0 | |
| 381 pop(rbp); | |
| 382 } | |
| 383 | |
| 384 | |
| 0 | 385 void C1_MacroAssembler::unverified_entry(Register receiver, Register ic_klass) { |
| 386 if (C1Breakpoint) int3(); | |
| 387 inline_cache_check(receiver, ic_klass); | |
| 388 } | |
| 389 | |
| 390 | |
| 391 void C1_MacroAssembler::verified_entry() { | |
| 392 if (C1Breakpoint)int3(); | |
| 393 // build frame | |
| 394 verify_FPU(0, "method_entry"); | |
| 395 } | |
| 396 | |
| 397 | |
| 398 #ifndef PRODUCT | |
| 399 | |
| 400 void C1_MacroAssembler::verify_stack_oop(int stack_offset) { | |
| 401 if (!VerifyOops) return; | |
| 402 verify_oop_addr(Address(rsp, stack_offset)); | |
| 403 } | |
| 404 | |
| 405 void C1_MacroAssembler::verify_not_null_oop(Register r) { | |
| 406 if (!VerifyOops) return; | |
| 407 Label not_null; | |
| 304 | 408 testptr(r, r); |
| 0 | 409 jcc(Assembler::notZero, not_null); |
| 410 stop("non-null oop required"); | |
| 411 bind(not_null); | |
| 412 verify_oop(r); | |
| 413 } | |
| 414 | |
| 415 void C1_MacroAssembler::invalidate_registers(bool inv_rax, bool inv_rbx, bool inv_rcx, bool inv_rdx, bool inv_rsi, bool inv_rdi) { | |
| 416 #ifdef ASSERT | |
| 304 | 417 if (inv_rax) movptr(rax, 0xDEAD); |
| 418 if (inv_rbx) movptr(rbx, 0xDEAD); | |
| 419 if (inv_rcx) movptr(rcx, 0xDEAD); | |
| 420 if (inv_rdx) movptr(rdx, 0xDEAD); | |
| 421 if (inv_rsi) movptr(rsi, 0xDEAD); | |
| 422 if (inv_rdi) movptr(rdi, 0xDEAD); | |
| 0 | 423 #endif |
| 424 } | |
| 425 | |
| 426 #endif // ifndef PRODUCT |