Mercurial > hg > truffle
annotate src/share/vm/asm/assembler.cpp @ 3883:ce9bde819dcb hs22-b04
7086589: bump the hs22 build number to 04
Reviewed-by: johnc
Contributed-by: alejandro.murillo@oracle.com
| author | jcoomes |
|---|---|
| date | Fri, 02 Sep 2011 03:49:30 -0700 |
| parents | 1d1603768966 |
| children | 40c2484c09e1 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 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 "asm/assembler.hpp" | |
| 27 #include "asm/assembler.inline.hpp" | |
| 28 #include "asm/codeBuffer.hpp" | |
| 29 #include "runtime/icache.hpp" | |
| 30 #include "runtime/os.hpp" | |
| 31 #ifdef TARGET_ARCH_x86 | |
| 32 # include "assembler_x86.inline.hpp" | |
| 33 #endif | |
| 34 #ifdef TARGET_ARCH_sparc | |
| 35 # include "assembler_sparc.inline.hpp" | |
| 36 #endif | |
| 37 #ifdef TARGET_ARCH_zero | |
| 38 # include "assembler_zero.inline.hpp" | |
| 39 #endif | |
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40 #ifdef TARGET_ARCH_arm |
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41 # include "assembler_arm.inline.hpp" |
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42 #endif |
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43 #ifdef TARGET_ARCH_ppc |
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44 # include "assembler_ppc.inline.hpp" |
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45 #endif |
| 0 | 46 |
| 47 | |
| 48 // Implementation of AbstractAssembler | |
| 49 // | |
| 50 // The AbstractAssembler is generating code into a CodeBuffer. To make code generation faster, | |
| 51 // the assembler keeps a copy of the code buffers boundaries & modifies them when | |
| 52 // emitting bytes rather than using the code buffers accessor functions all the time. | |
| 605 | 53 // The code buffer is updated via set_code_end(...) after emitting a whole instruction. |
| 0 | 54 |
| 55 AbstractAssembler::AbstractAssembler(CodeBuffer* code) { | |
| 56 if (code == NULL) return; | |
| 57 CodeSection* cs = code->insts(); | |
| 58 cs->clear_mark(); // new assembler kills old mark | |
| 59 _code_section = cs; | |
| 60 _code_begin = cs->start(); | |
| 61 _code_limit = cs->limit(); | |
| 62 _code_pos = cs->end(); | |
| 63 _oop_recorder= code->oop_recorder(); | |
| 64 if (_code_begin == NULL) { | |
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65 vm_exit_out_of_memory(0, err_msg("CodeCache: no room for %s", |
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66 code->name())); |
| 0 | 67 } |
| 68 } | |
| 69 | |
| 70 void AbstractAssembler::set_code_section(CodeSection* cs) { | |
| 71 assert(cs->outer() == code_section()->outer(), "sanity"); | |
| 72 assert(cs->is_allocated(), "need to pre-allocate this section"); | |
| 73 cs->clear_mark(); // new assembly into this section kills old mark | |
| 74 _code_section = cs; | |
| 75 _code_begin = cs->start(); | |
| 76 _code_limit = cs->limit(); | |
| 77 _code_pos = cs->end(); | |
| 78 } | |
| 79 | |
| 80 // Inform CodeBuffer that incoming code and relocation will be for stubs | |
| 81 address AbstractAssembler::start_a_stub(int required_space) { | |
| 82 CodeBuffer* cb = code(); | |
| 83 CodeSection* cs = cb->stubs(); | |
| 84 assert(_code_section == cb->insts(), "not in insts?"); | |
| 85 sync(); | |
| 86 if (cs->maybe_expand_to_ensure_remaining(required_space) | |
| 87 && cb->blob() == NULL) { | |
| 88 return NULL; | |
| 89 } | |
| 90 set_code_section(cs); | |
| 91 return pc(); | |
| 92 } | |
| 93 | |
| 94 // Inform CodeBuffer that incoming code and relocation will be code | |
| 95 // Should not be called if start_a_stub() returned NULL | |
| 96 void AbstractAssembler::end_a_stub() { | |
| 97 assert(_code_section == code()->stubs(), "not in stubs?"); | |
| 98 sync(); | |
| 99 set_code_section(code()->insts()); | |
| 100 } | |
| 101 | |
| 102 // Inform CodeBuffer that incoming code and relocation will be for stubs | |
| 103 address AbstractAssembler::start_a_const(int required_space, int required_align) { | |
| 104 CodeBuffer* cb = code(); | |
| 105 CodeSection* cs = cb->consts(); | |
| 106 assert(_code_section == cb->insts(), "not in insts?"); | |
| 107 sync(); | |
| 108 address end = cs->end(); | |
| 109 int pad = -(intptr_t)end & (required_align-1); | |
| 110 if (cs->maybe_expand_to_ensure_remaining(pad + required_space)) { | |
| 111 if (cb->blob() == NULL) return NULL; | |
| 112 end = cs->end(); // refresh pointer | |
| 113 } | |
| 114 if (pad > 0) { | |
| 115 while (--pad >= 0) { *end++ = 0; } | |
| 116 cs->set_end(end); | |
| 117 } | |
| 118 set_code_section(cs); | |
| 119 return end; | |
| 120 } | |
| 121 | |
| 122 // Inform CodeBuffer that incoming code and relocation will be code | |
| 123 // Should not be called if start_a_const() returned NULL | |
| 124 void AbstractAssembler::end_a_const() { | |
| 125 assert(_code_section == code()->consts(), "not in consts?"); | |
| 126 sync(); | |
| 127 set_code_section(code()->insts()); | |
| 128 } | |
| 129 | |
| 130 | |
| 131 void AbstractAssembler::flush() { | |
| 132 sync(); | |
| 133 ICache::invalidate_range(addr_at(0), offset()); | |
| 134 } | |
| 135 | |
| 136 | |
| 137 void AbstractAssembler::a_byte(int x) { | |
| 138 emit_byte(x); | |
| 139 } | |
| 140 | |
| 141 | |
| 142 void AbstractAssembler::a_long(jint x) { | |
| 143 emit_long(x); | |
| 144 } | |
| 145 | |
| 146 // Labels refer to positions in the (to be) generated code. There are bound | |
| 147 // and unbound | |
| 148 // | |
| 149 // Bound labels refer to known positions in the already generated code. | |
| 150 // offset() is the position the label refers to. | |
| 151 // | |
| 152 // Unbound labels refer to unknown positions in the code to be generated; it | |
| 153 // may contain a list of unresolved displacements that refer to it | |
| 154 #ifndef PRODUCT | |
| 155 void AbstractAssembler::print(Label& L) { | |
| 156 if (L.is_bound()) { | |
| 157 tty->print_cr("bound label to %d|%d", L.loc_pos(), L.loc_sect()); | |
| 158 } else if (L.is_unbound()) { | |
| 159 L.print_instructions((MacroAssembler*)this); | |
| 160 } else { | |
| 161 tty->print_cr("label in inconsistent state (loc = %d)", L.loc()); | |
| 162 } | |
| 163 } | |
| 164 #endif // PRODUCT | |
| 165 | |
| 166 | |
| 167 void AbstractAssembler::bind(Label& L) { | |
| 168 if (L.is_bound()) { | |
| 169 // Assembler can bind a label more than once to the same place. | |
| 170 guarantee(L.loc() == locator(), "attempt to redefine label"); | |
| 171 return; | |
| 172 } | |
| 173 L.bind_loc(locator()); | |
| 174 L.patch_instructions((MacroAssembler*)this); | |
| 175 } | |
| 176 | |
| 177 void AbstractAssembler::generate_stack_overflow_check( int frame_size_in_bytes) { | |
| 178 if (UseStackBanging) { | |
| 179 // Each code entry causes one stack bang n pages down the stack where n | |
| 180 // is configurable by StackBangPages. The setting depends on the maximum | |
| 181 // depth of VM call stack or native before going back into java code, | |
| 182 // since only java code can raise a stack overflow exception using the | |
| 183 // stack banging mechanism. The VM and native code does not detect stack | |
| 184 // overflow. | |
| 185 // The code in JavaCalls::call() checks that there is at least n pages | |
| 186 // available, so all entry code needs to do is bang once for the end of | |
| 187 // this shadow zone. | |
| 188 // The entry code may need to bang additional pages if the framesize | |
| 189 // is greater than a page. | |
| 190 | |
| 191 const int page_size = os::vm_page_size(); | |
| 192 int bang_end = StackShadowPages*page_size; | |
| 193 | |
| 194 // This is how far the previous frame's stack banging extended. | |
| 195 const int bang_end_safe = bang_end; | |
| 196 | |
| 197 if (frame_size_in_bytes > page_size) { | |
| 198 bang_end += frame_size_in_bytes; | |
| 199 } | |
| 200 | |
| 201 int bang_offset = bang_end_safe; | |
| 202 while (bang_offset <= bang_end) { | |
| 203 // Need at least one stack bang at end of shadow zone. | |
| 204 bang_stack_with_offset(bang_offset); | |
| 205 bang_offset += page_size; | |
| 206 } | |
| 207 } // end (UseStackBanging) | |
| 208 } | |
| 209 | |
| 210 void Label::add_patch_at(CodeBuffer* cb, int branch_loc) { | |
| 211 assert(_loc == -1, "Label is unbound"); | |
| 212 if (_patch_index < PatchCacheSize) { | |
| 213 _patches[_patch_index] = branch_loc; | |
| 214 } else { | |
| 215 if (_patch_overflow == NULL) { | |
| 216 _patch_overflow = cb->create_patch_overflow(); | |
| 217 } | |
| 218 _patch_overflow->push(branch_loc); | |
| 219 } | |
| 220 ++_patch_index; | |
| 221 } | |
| 222 | |
| 223 void Label::patch_instructions(MacroAssembler* masm) { | |
| 224 assert(is_bound(), "Label is bound"); | |
| 225 CodeBuffer* cb = masm->code(); | |
| 226 int target_sect = CodeBuffer::locator_sect(loc()); | |
| 227 address target = cb->locator_address(loc()); | |
| 228 while (_patch_index > 0) { | |
| 229 --_patch_index; | |
| 230 int branch_loc; | |
| 231 if (_patch_index >= PatchCacheSize) { | |
| 232 branch_loc = _patch_overflow->pop(); | |
| 233 } else { | |
| 234 branch_loc = _patches[_patch_index]; | |
| 235 } | |
| 236 int branch_sect = CodeBuffer::locator_sect(branch_loc); | |
| 237 address branch = cb->locator_address(branch_loc); | |
| 238 if (branch_sect == CodeBuffer::SECT_CONSTS) { | |
| 239 // The thing to patch is a constant word. | |
| 240 *(address*)branch = target; | |
| 241 continue; | |
| 242 } | |
| 243 | |
| 244 #ifdef ASSERT | |
| 245 // Cross-section branches only work if the | |
| 246 // intermediate section boundaries are frozen. | |
| 247 if (target_sect != branch_sect) { | |
| 248 for (int n = MIN2(target_sect, branch_sect), | |
| 249 nlimit = (target_sect + branch_sect) - n; | |
| 250 n < nlimit; n++) { | |
| 251 CodeSection* cs = cb->code_section(n); | |
| 252 assert(cs->is_frozen(), "cross-section branch needs stable offsets"); | |
| 253 } | |
| 254 } | |
| 255 #endif //ASSERT | |
| 256 | |
| 257 // Push the target offset into the branch instruction. | |
| 258 masm->pd_patch_instruction(branch, target); | |
| 259 } | |
| 260 } | |
| 261 | |
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262 struct DelayedConstant { |
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263 typedef void (*value_fn_t)(); |
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264 BasicType type; |
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265 intptr_t value; |
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266 value_fn_t value_fn; |
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267 // This limit of 20 is generous for initial uses. |
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268 // The limit needs to be large enough to store the field offsets |
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269 // into classes which do not have statically fixed layouts. |
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270 // (Initial use is for method handle object offsets.) |
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271 // Look for uses of "delayed_value" in the source code |
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272 // and make sure this number is generous enough to handle all of them. |
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273 enum { DC_LIMIT = 20 }; |
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274 static DelayedConstant delayed_constants[DC_LIMIT]; |
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275 static DelayedConstant* add(BasicType type, value_fn_t value_fn); |
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276 bool match(BasicType t, value_fn_t cfn) { |
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277 return type == t && value_fn == cfn; |
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278 } |
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279 static void update_all(); |
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280 }; |
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281 |
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282 DelayedConstant DelayedConstant::delayed_constants[DC_LIMIT]; |
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283 // Default C structure initialization rules have the following effect here: |
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284 // = { { (BasicType)0, (intptr_t)NULL }, ... }; |
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285 |
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286 DelayedConstant* DelayedConstant::add(BasicType type, |
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287 DelayedConstant::value_fn_t cfn) { |
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288 for (int i = 0; i < DC_LIMIT; i++) { |
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289 DelayedConstant* dcon = &delayed_constants[i]; |
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290 if (dcon->match(type, cfn)) |
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291 return dcon; |
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292 if (dcon->value_fn == NULL) { |
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293 // (cmpxchg not because this is multi-threaded but because I'm paranoid) |
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294 if (Atomic::cmpxchg_ptr(CAST_FROM_FN_PTR(void*, cfn), &dcon->value_fn, NULL) == NULL) { |
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295 dcon->type = type; |
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296 return dcon; |
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297 } |
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298 } |
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299 } |
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300 // If this assert is hit (in pre-integration testing!) then re-evaluate |
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301 // the comment on the definition of DC_LIMIT. |
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302 guarantee(false, "too many delayed constants"); |
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303 return NULL; |
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304 } |
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305 |
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306 void DelayedConstant::update_all() { |
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307 for (int i = 0; i < DC_LIMIT; i++) { |
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308 DelayedConstant* dcon = &delayed_constants[i]; |
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309 if (dcon->value_fn != NULL && dcon->value == 0) { |
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310 typedef int (*int_fn_t)(); |
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311 typedef address (*address_fn_t)(); |
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312 switch (dcon->type) { |
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313 case T_INT: dcon->value = (intptr_t) ((int_fn_t) dcon->value_fn)(); break; |
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314 case T_ADDRESS: dcon->value = (intptr_t) ((address_fn_t)dcon->value_fn)(); break; |
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315 } |
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316 } |
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317 } |
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318 } |
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319 |
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320 intptr_t* AbstractAssembler::delayed_value_addr(int(*value_fn)()) { |
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321 DelayedConstant* dcon = DelayedConstant::add(T_INT, (DelayedConstant::value_fn_t) value_fn); |
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322 return &dcon->value; |
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323 } |
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324 intptr_t* AbstractAssembler::delayed_value_addr(address(*value_fn)()) { |
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325 DelayedConstant* dcon = DelayedConstant::add(T_ADDRESS, (DelayedConstant::value_fn_t) value_fn); |
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326 return &dcon->value; |
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327 } |
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328 void AbstractAssembler::update_delayed_values() { |
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329 DelayedConstant::update_all(); |
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330 } |
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331 |
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332 |
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333 |
| 0 | 334 |
| 335 void AbstractAssembler::block_comment(const char* comment) { | |
| 336 if (sect() == CodeBuffer::SECT_INSTS) { | |
| 337 code_section()->outer()->block_comment(offset(), comment); | |
| 338 } | |
| 339 } | |
| 340 | |
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341 bool MacroAssembler::needs_explicit_null_check(intptr_t offset) { |
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342 // Exception handler checks the nmethod's implicit null checks table |
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343 // only when this method returns false. |
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344 #ifdef _LP64 |
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345 if (UseCompressedOops && Universe::narrow_oop_base() != NULL) { |
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346 assert (Universe::heap() != NULL, "java heap should be initialized"); |
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347 // The first page after heap_base is unmapped and |
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348 // the 'offset' is equal to [heap_base + offset] for |
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349 // narrow oop implicit null checks. |
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350 uintptr_t base = (uintptr_t)Universe::narrow_oop_base(); |
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351 if ((uintptr_t)offset >= base) { |
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352 // Normalize offset for the next check. |
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353 offset = (intptr_t)(pointer_delta((void*)offset, (void*)base, 1)); |
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354 } |
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355 } |
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356 #endif |
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357 return offset < 0 || os::vm_page_size() <= offset; |
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358 } |
| 0 | 359 |
| 360 #ifndef PRODUCT | |
| 361 void Label::print_instructions(MacroAssembler* masm) const { | |
| 362 CodeBuffer* cb = masm->code(); | |
| 363 for (int i = 0; i < _patch_index; ++i) { | |
| 364 int branch_loc; | |
| 365 if (i >= PatchCacheSize) { | |
| 366 branch_loc = _patch_overflow->at(i - PatchCacheSize); | |
| 367 } else { | |
| 368 branch_loc = _patches[i]; | |
| 369 } | |
| 370 int branch_pos = CodeBuffer::locator_pos(branch_loc); | |
| 371 int branch_sect = CodeBuffer::locator_sect(branch_loc); | |
| 372 address branch = cb->locator_address(branch_loc); | |
| 373 tty->print_cr("unbound label"); | |
| 374 tty->print("@ %d|%d ", branch_pos, branch_sect); | |
| 375 if (branch_sect == CodeBuffer::SECT_CONSTS) { | |
| 376 tty->print_cr(PTR_FORMAT, *(address*)branch); | |
| 377 continue; | |
| 378 } | |
| 379 masm->pd_print_patched_instruction(branch); | |
| 380 tty->cr(); | |
| 381 } | |
| 382 } | |
| 383 #endif // ndef PRODUCT |