Mercurial > hg > truffle
annotate src/cpu/x86/vm/c1_MacroAssembler_x86.cpp @ 6327:be0788825ffa
Move VirtualMachineComponent to interpreter project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Fri, 07 Sep 2012 11:10:48 +0200 |
parents | 2f2c6347fce4 |
children | e522a00b91aa |
rev | line source |
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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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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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125 if (use_basic_object_lock) { |
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126 // load object |
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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); | |
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159 movptr(t1, Address(klass, Klass::prototype_header_offset())); |
304 | 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 #ifndef GRAAL |
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294 // TODO(thomaswue): Check how we can access the flag without a ciEnv object. |
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295 if (CURRENT_ENV->dtrace_alloc_probes()) { |
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296 assert(obj == rax, "must be"); |
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297 call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id))); |
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298 } |
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299 #endif |
0 | 300 |
301 verify_oop(obj); | |
302 } | |
303 | |
304 void C1_MacroAssembler::allocate_array(Register obj, Register len, Register t1, Register t2, int header_size, Address::ScaleFactor f, Register klass, Label& slow_case) { | |
305 assert(obj == rax, "obj must be in rax, for cmpxchg"); | |
306 assert_different_registers(obj, len, t1, t2, klass); | |
307 | |
308 // determine alignment mask | |
304 | 309 assert(!(BytesPerWord & 1), "must be a multiple of 2 for masking code to work"); |
0 | 310 |
311 // check for negative or excessive length | |
304 | 312 cmpptr(len, (int32_t)max_array_allocation_length); |
0 | 313 jcc(Assembler::above, slow_case); |
314 | |
315 const Register arr_size = t2; // okay to be the same | |
316 // align object end | |
304 | 317 movptr(arr_size, (int32_t)header_size * BytesPerWord + MinObjAlignmentInBytesMask); |
318 lea(arr_size, Address(arr_size, len, f)); | |
319 andptr(arr_size, ~MinObjAlignmentInBytesMask); | |
0 | 320 |
321 try_allocate(obj, arr_size, 0, t1, t2, slow_case); | |
322 | |
323 initialize_header(obj, klass, len, t1, t2); | |
324 | |
325 // clear rest of allocated space | |
326 const Register len_zero = len; | |
327 initialize_body(obj, arr_size, header_size * BytesPerWord, len_zero); | |
328 | |
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329 |
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330 #ifndef GRAAL |
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331 // TODO(thomaswue): Check how we can access the flag without a ciEnv object. |
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332 if (CURRENT_ENV->dtrace_alloc_probes()) { |
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333 assert(obj == rax, "must be"); |
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334 call(RuntimeAddress(Runtime1::entry_for(Runtime1::dtrace_object_alloc_id))); |
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335 } |
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336 #endif |
0 | 337 |
338 verify_oop(obj); | |
339 } | |
340 | |
341 | |
342 | |
343 void C1_MacroAssembler::inline_cache_check(Register receiver, Register iCache) { | |
344 verify_oop(receiver); | |
345 // explicit NULL check not needed since load from [klass_offset] causes a trap | |
346 // check against inline cache | |
347 assert(!MacroAssembler::needs_explicit_null_check(oopDesc::klass_offset_in_bytes()), "must add explicit null check"); | |
348 int start_offset = offset(); | |
2002 | 349 |
350 if (UseCompressedOops) { | |
351 load_klass(rscratch1, receiver); | |
352 cmpptr(rscratch1, iCache); | |
353 } else { | |
354 cmpptr(iCache, Address(receiver, oopDesc::klass_offset_in_bytes())); | |
355 } | |
0 | 356 // if icache check fails, then jump to runtime routine |
357 // Note: RECEIVER must still contain the receiver! | |
358 jump_cc(Assembler::notEqual, | |
359 RuntimeAddress(SharedRuntime::get_ic_miss_stub())); | |
304 | 360 const int ic_cmp_size = LP64_ONLY(10) NOT_LP64(9); |
2002 | 361 assert(UseCompressedOops || offset() - start_offset == ic_cmp_size, "check alignment in emit_method_entry"); |
0 | 362 } |
363 | |
364 | |
365 void C1_MacroAssembler::build_frame(int frame_size_in_bytes) { | |
366 // Make sure there is enough stack space for this method's activation. | |
367 // Note that we do this before doing an enter(). This matches the | |
368 // ordering of C2's stack overflow check / rsp decrement and allows | |
369 // the SharedRuntime stack overflow handling to be consistent | |
370 // between the two compilers. | |
371 generate_stack_overflow_check(frame_size_in_bytes); | |
372 | |
1295 | 373 push(rbp); |
0 | 374 #ifdef TIERED |
375 // c2 leaves fpu stack dirty. Clean it on entry | |
376 if (UseSSE < 2 ) { | |
377 empty_FPU_stack(); | |
378 } | |
379 #endif // TIERED | |
380 decrement(rsp, frame_size_in_bytes); // does not emit code for frame_size == 0 | |
381 } | |
382 | |
383 | |
1295 | 384 void C1_MacroAssembler::remove_frame(int frame_size_in_bytes) { |
385 increment(rsp, frame_size_in_bytes); // Does not emit code for frame_size == 0 | |
386 pop(rbp); | |
387 } | |
388 | |
389 | |
0 | 390 void C1_MacroAssembler::unverified_entry(Register receiver, Register ic_klass) { |
391 if (C1Breakpoint) int3(); | |
392 inline_cache_check(receiver, ic_klass); | |
393 } | |
394 | |
395 | |
396 void C1_MacroAssembler::verified_entry() { | |
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397 if (C1Breakpoint || VerifyFPU || !UseStackBanging) { |
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398 // Verified Entry first instruction should be 5 bytes long for correct |
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399 // patching by patch_verified_entry(). |
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400 // |
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401 // C1Breakpoint and VerifyFPU have one byte first instruction. |
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402 // Also first instruction will be one byte "push(rbp)" if stack banging |
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403 // code is not generated (see build_frame() above). |
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404 // For all these cases generate long instruction first. |
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405 fat_nop(); |
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406 } |
0 | 407 if (C1Breakpoint)int3(); |
408 // build frame | |
409 verify_FPU(0, "method_entry"); | |
410 } | |
411 | |
412 | |
413 #ifndef PRODUCT | |
414 | |
415 void C1_MacroAssembler::verify_stack_oop(int stack_offset) { | |
416 if (!VerifyOops) return; | |
417 verify_oop_addr(Address(rsp, stack_offset)); | |
418 } | |
419 | |
420 void C1_MacroAssembler::verify_not_null_oop(Register r) { | |
421 if (!VerifyOops) return; | |
422 Label not_null; | |
304 | 423 testptr(r, r); |
0 | 424 jcc(Assembler::notZero, not_null); |
425 stop("non-null oop required"); | |
426 bind(not_null); | |
427 verify_oop(r); | |
428 } | |
429 | |
430 void C1_MacroAssembler::invalidate_registers(bool inv_rax, bool inv_rbx, bool inv_rcx, bool inv_rdx, bool inv_rsi, bool inv_rdi) { | |
431 #ifdef ASSERT | |
304 | 432 if (inv_rax) movptr(rax, 0xDEAD); |
433 if (inv_rbx) movptr(rbx, 0xDEAD); | |
434 if (inv_rcx) movptr(rcx, 0xDEAD); | |
435 if (inv_rdx) movptr(rdx, 0xDEAD); | |
436 if (inv_rsi) movptr(rsi, 0xDEAD); | |
437 if (inv_rdi) movptr(rdi, 0xDEAD); | |
0 | 438 #endif |
439 } | |
440 | |
441 #endif // ifndef PRODUCT |