Mercurial > hg > truffle
annotate src/share/vm/asm/assembler.cpp @ 1490:f03d0a26bf83
6888954: argument formatting for assert() and friends
Reviewed-by: kvn, twisti, apetrusenko, never, dcubed
| author | jcoomes |
|---|---|
| date | Thu, 22 Apr 2010 13:23:15 -0700 |
| parents | bd02caa94611 |
| children | c18cbe5936b8 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 844 | 2 * Copyright 1997-2009 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/_assembler.cpp.incl" | |
| 27 | |
| 28 | |
| 29 // Implementation of AbstractAssembler | |
| 30 // | |
| 31 // The AbstractAssembler is generating code into a CodeBuffer. To make code generation faster, | |
| 32 // the assembler keeps a copy of the code buffers boundaries & modifies them when | |
| 33 // emitting bytes rather than using the code buffers accessor functions all the time. | |
| 605 | 34 // The code buffer is updated via set_code_end(...) after emitting a whole instruction. |
| 0 | 35 |
| 36 AbstractAssembler::AbstractAssembler(CodeBuffer* code) { | |
| 37 if (code == NULL) return; | |
| 38 CodeSection* cs = code->insts(); | |
| 39 cs->clear_mark(); // new assembler kills old mark | |
| 40 _code_section = cs; | |
| 41 _code_begin = cs->start(); | |
| 42 _code_limit = cs->limit(); | |
| 43 _code_pos = cs->end(); | |
| 44 _oop_recorder= code->oop_recorder(); | |
| 45 if (_code_begin == NULL) { | |
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46 vm_exit_out_of_memory(0, err_msg("CodeCache: no room for %s", |
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47 code->name())); |
| 0 | 48 } |
| 49 } | |
| 50 | |
| 51 void AbstractAssembler::set_code_section(CodeSection* cs) { | |
| 52 assert(cs->outer() == code_section()->outer(), "sanity"); | |
| 53 assert(cs->is_allocated(), "need to pre-allocate this section"); | |
| 54 cs->clear_mark(); // new assembly into this section kills old mark | |
| 55 _code_section = cs; | |
| 56 _code_begin = cs->start(); | |
| 57 _code_limit = cs->limit(); | |
| 58 _code_pos = cs->end(); | |
| 59 } | |
| 60 | |
| 61 // Inform CodeBuffer that incoming code and relocation will be for stubs | |
| 62 address AbstractAssembler::start_a_stub(int required_space) { | |
| 63 CodeBuffer* cb = code(); | |
| 64 CodeSection* cs = cb->stubs(); | |
| 65 assert(_code_section == cb->insts(), "not in insts?"); | |
| 66 sync(); | |
| 67 if (cs->maybe_expand_to_ensure_remaining(required_space) | |
| 68 && cb->blob() == NULL) { | |
| 69 return NULL; | |
| 70 } | |
| 71 set_code_section(cs); | |
| 72 return pc(); | |
| 73 } | |
| 74 | |
| 75 // Inform CodeBuffer that incoming code and relocation will be code | |
| 76 // Should not be called if start_a_stub() returned NULL | |
| 77 void AbstractAssembler::end_a_stub() { | |
| 78 assert(_code_section == code()->stubs(), "not in stubs?"); | |
| 79 sync(); | |
| 80 set_code_section(code()->insts()); | |
| 81 } | |
| 82 | |
| 83 // Inform CodeBuffer that incoming code and relocation will be for stubs | |
| 84 address AbstractAssembler::start_a_const(int required_space, int required_align) { | |
| 85 CodeBuffer* cb = code(); | |
| 86 CodeSection* cs = cb->consts(); | |
| 87 assert(_code_section == cb->insts(), "not in insts?"); | |
| 88 sync(); | |
| 89 address end = cs->end(); | |
| 90 int pad = -(intptr_t)end & (required_align-1); | |
| 91 if (cs->maybe_expand_to_ensure_remaining(pad + required_space)) { | |
| 92 if (cb->blob() == NULL) return NULL; | |
| 93 end = cs->end(); // refresh pointer | |
| 94 } | |
| 95 if (pad > 0) { | |
| 96 while (--pad >= 0) { *end++ = 0; } | |
| 97 cs->set_end(end); | |
| 98 } | |
| 99 set_code_section(cs); | |
| 100 return end; | |
| 101 } | |
| 102 | |
| 103 // Inform CodeBuffer that incoming code and relocation will be code | |
| 104 // Should not be called if start_a_const() returned NULL | |
| 105 void AbstractAssembler::end_a_const() { | |
| 106 assert(_code_section == code()->consts(), "not in consts?"); | |
| 107 sync(); | |
| 108 set_code_section(code()->insts()); | |
| 109 } | |
| 110 | |
| 111 | |
| 112 void AbstractAssembler::flush() { | |
| 113 sync(); | |
| 114 ICache::invalidate_range(addr_at(0), offset()); | |
| 115 } | |
| 116 | |
| 117 | |
| 118 void AbstractAssembler::a_byte(int x) { | |
| 119 emit_byte(x); | |
| 120 } | |
| 121 | |
| 122 | |
| 123 void AbstractAssembler::a_long(jint x) { | |
| 124 emit_long(x); | |
| 125 } | |
| 126 | |
| 127 // Labels refer to positions in the (to be) generated code. There are bound | |
| 128 // and unbound | |
| 129 // | |
| 130 // Bound labels refer to known positions in the already generated code. | |
| 131 // offset() is the position the label refers to. | |
| 132 // | |
| 133 // Unbound labels refer to unknown positions in the code to be generated; it | |
| 134 // may contain a list of unresolved displacements that refer to it | |
| 135 #ifndef PRODUCT | |
| 136 void AbstractAssembler::print(Label& L) { | |
| 137 if (L.is_bound()) { | |
| 138 tty->print_cr("bound label to %d|%d", L.loc_pos(), L.loc_sect()); | |
| 139 } else if (L.is_unbound()) { | |
| 140 L.print_instructions((MacroAssembler*)this); | |
| 141 } else { | |
| 142 tty->print_cr("label in inconsistent state (loc = %d)", L.loc()); | |
| 143 } | |
| 144 } | |
| 145 #endif // PRODUCT | |
| 146 | |
| 147 | |
| 148 void AbstractAssembler::bind(Label& L) { | |
| 149 if (L.is_bound()) { | |
| 150 // Assembler can bind a label more than once to the same place. | |
| 151 guarantee(L.loc() == locator(), "attempt to redefine label"); | |
| 152 return; | |
| 153 } | |
| 154 L.bind_loc(locator()); | |
| 155 L.patch_instructions((MacroAssembler*)this); | |
| 156 } | |
| 157 | |
| 158 void AbstractAssembler::generate_stack_overflow_check( int frame_size_in_bytes) { | |
| 159 if (UseStackBanging) { | |
| 160 // Each code entry causes one stack bang n pages down the stack where n | |
| 161 // is configurable by StackBangPages. The setting depends on the maximum | |
| 162 // depth of VM call stack or native before going back into java code, | |
| 163 // since only java code can raise a stack overflow exception using the | |
| 164 // stack banging mechanism. The VM and native code does not detect stack | |
| 165 // overflow. | |
| 166 // The code in JavaCalls::call() checks that there is at least n pages | |
| 167 // available, so all entry code needs to do is bang once for the end of | |
| 168 // this shadow zone. | |
| 169 // The entry code may need to bang additional pages if the framesize | |
| 170 // is greater than a page. | |
| 171 | |
| 172 const int page_size = os::vm_page_size(); | |
| 173 int bang_end = StackShadowPages*page_size; | |
| 174 | |
| 175 // This is how far the previous frame's stack banging extended. | |
| 176 const int bang_end_safe = bang_end; | |
| 177 | |
| 178 if (frame_size_in_bytes > page_size) { | |
| 179 bang_end += frame_size_in_bytes; | |
| 180 } | |
| 181 | |
| 182 int bang_offset = bang_end_safe; | |
| 183 while (bang_offset <= bang_end) { | |
| 184 // Need at least one stack bang at end of shadow zone. | |
| 185 bang_stack_with_offset(bang_offset); | |
| 186 bang_offset += page_size; | |
| 187 } | |
| 188 } // end (UseStackBanging) | |
| 189 } | |
| 190 | |
| 191 void Label::add_patch_at(CodeBuffer* cb, int branch_loc) { | |
| 192 assert(_loc == -1, "Label is unbound"); | |
| 193 if (_patch_index < PatchCacheSize) { | |
| 194 _patches[_patch_index] = branch_loc; | |
| 195 } else { | |
| 196 if (_patch_overflow == NULL) { | |
| 197 _patch_overflow = cb->create_patch_overflow(); | |
| 198 } | |
| 199 _patch_overflow->push(branch_loc); | |
| 200 } | |
| 201 ++_patch_index; | |
| 202 } | |
| 203 | |
| 204 void Label::patch_instructions(MacroAssembler* masm) { | |
| 205 assert(is_bound(), "Label is bound"); | |
| 206 CodeBuffer* cb = masm->code(); | |
| 207 int target_sect = CodeBuffer::locator_sect(loc()); | |
| 208 address target = cb->locator_address(loc()); | |
| 209 while (_patch_index > 0) { | |
| 210 --_patch_index; | |
| 211 int branch_loc; | |
| 212 if (_patch_index >= PatchCacheSize) { | |
| 213 branch_loc = _patch_overflow->pop(); | |
| 214 } else { | |
| 215 branch_loc = _patches[_patch_index]; | |
| 216 } | |
| 217 int branch_sect = CodeBuffer::locator_sect(branch_loc); | |
| 218 address branch = cb->locator_address(branch_loc); | |
| 219 if (branch_sect == CodeBuffer::SECT_CONSTS) { | |
| 220 // The thing to patch is a constant word. | |
| 221 *(address*)branch = target; | |
| 222 continue; | |
| 223 } | |
| 224 | |
| 225 #ifdef ASSERT | |
| 226 // Cross-section branches only work if the | |
| 227 // intermediate section boundaries are frozen. | |
| 228 if (target_sect != branch_sect) { | |
| 229 for (int n = MIN2(target_sect, branch_sect), | |
| 230 nlimit = (target_sect + branch_sect) - n; | |
| 231 n < nlimit; n++) { | |
| 232 CodeSection* cs = cb->code_section(n); | |
| 233 assert(cs->is_frozen(), "cross-section branch needs stable offsets"); | |
| 234 } | |
| 235 } | |
| 236 #endif //ASSERT | |
| 237 | |
| 238 // Push the target offset into the branch instruction. | |
| 239 masm->pd_patch_instruction(branch, target); | |
| 240 } | |
| 241 } | |
| 242 | |
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243 struct DelayedConstant { |
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244 typedef void (*value_fn_t)(); |
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245 BasicType type; |
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246 intptr_t value; |
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247 value_fn_t value_fn; |
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248 // This limit of 20 is generous for initial uses. |
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249 // The limit needs to be large enough to store the field offsets |
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250 // into classes which do not have statically fixed layouts. |
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251 // (Initial use is for method handle object offsets.) |
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252 // Look for uses of "delayed_value" in the source code |
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253 // and make sure this number is generous enough to handle all of them. |
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254 enum { DC_LIMIT = 20 }; |
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255 static DelayedConstant delayed_constants[DC_LIMIT]; |
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256 static DelayedConstant* add(BasicType type, value_fn_t value_fn); |
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257 bool match(BasicType t, value_fn_t cfn) { |
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258 return type == t && value_fn == cfn; |
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259 } |
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260 static void update_all(); |
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261 }; |
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262 |
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263 DelayedConstant DelayedConstant::delayed_constants[DC_LIMIT]; |
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264 // Default C structure initialization rules have the following effect here: |
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265 // = { { (BasicType)0, (intptr_t)NULL }, ... }; |
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266 |
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267 DelayedConstant* DelayedConstant::add(BasicType type, |
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268 DelayedConstant::value_fn_t cfn) { |
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269 for (int i = 0; i < DC_LIMIT; i++) { |
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270 DelayedConstant* dcon = &delayed_constants[i]; |
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271 if (dcon->match(type, cfn)) |
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272 return dcon; |
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273 if (dcon->value_fn == NULL) { |
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274 // (cmpxchg not because this is multi-threaded but because I'm paranoid) |
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275 if (Atomic::cmpxchg_ptr(CAST_FROM_FN_PTR(void*, cfn), &dcon->value_fn, NULL) == NULL) { |
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276 dcon->type = type; |
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277 return dcon; |
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278 } |
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279 } |
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280 } |
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281 // If this assert is hit (in pre-integration testing!) then re-evaluate |
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282 // the comment on the definition of DC_LIMIT. |
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283 guarantee(false, "too many delayed constants"); |
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284 return NULL; |
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285 } |
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286 |
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287 void DelayedConstant::update_all() { |
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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->value_fn != NULL && dcon->value == 0) { |
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291 typedef int (*int_fn_t)(); |
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292 typedef address (*address_fn_t)(); |
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293 switch (dcon->type) { |
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294 case T_INT: dcon->value = (intptr_t) ((int_fn_t) dcon->value_fn)(); break; |
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295 case T_ADDRESS: dcon->value = (intptr_t) ((address_fn_t)dcon->value_fn)(); break; |
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296 } |
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297 } |
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298 } |
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299 } |
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300 |
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301 intptr_t* AbstractAssembler::delayed_value_addr(int(*value_fn)()) { |
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302 DelayedConstant* dcon = DelayedConstant::add(T_INT, (DelayedConstant::value_fn_t) value_fn); |
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303 return &dcon->value; |
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304 } |
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305 intptr_t* AbstractAssembler::delayed_value_addr(address(*value_fn)()) { |
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306 DelayedConstant* dcon = DelayedConstant::add(T_ADDRESS, (DelayedConstant::value_fn_t) value_fn); |
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307 return &dcon->value; |
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308 } |
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309 void AbstractAssembler::update_delayed_values() { |
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310 DelayedConstant::update_all(); |
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311 } |
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312 |
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313 |
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314 |
| 0 | 315 |
| 316 void AbstractAssembler::block_comment(const char* comment) { | |
| 317 if (sect() == CodeBuffer::SECT_INSTS) { | |
| 318 code_section()->outer()->block_comment(offset(), comment); | |
| 319 } | |
| 320 } | |
| 321 | |
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322 bool MacroAssembler::needs_explicit_null_check(intptr_t offset) { |
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323 // Exception handler checks the nmethod's implicit null checks table |
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324 // only when this method returns false. |
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325 #ifdef _LP64 |
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326 if (UseCompressedOops && Universe::narrow_oop_base() != NULL) { |
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327 assert (Universe::heap() != NULL, "java heap should be initialized"); |
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328 // The first page after heap_base is unmapped and |
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329 // the 'offset' is equal to [heap_base + offset] for |
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330 // narrow oop implicit null checks. |
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331 uintptr_t base = (uintptr_t)Universe::narrow_oop_base(); |
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332 if ((uintptr_t)offset >= base) { |
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333 // Normalize offset for the next check. |
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334 offset = (intptr_t)(pointer_delta((void*)offset, (void*)base, 1)); |
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335 } |
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336 } |
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337 #endif |
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338 return offset < 0 || os::vm_page_size() <= offset; |
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339 } |
| 0 | 340 |
| 341 #ifndef PRODUCT | |
| 342 void Label::print_instructions(MacroAssembler* masm) const { | |
| 343 CodeBuffer* cb = masm->code(); | |
| 344 for (int i = 0; i < _patch_index; ++i) { | |
| 345 int branch_loc; | |
| 346 if (i >= PatchCacheSize) { | |
| 347 branch_loc = _patch_overflow->at(i - PatchCacheSize); | |
| 348 } else { | |
| 349 branch_loc = _patches[i]; | |
| 350 } | |
| 351 int branch_pos = CodeBuffer::locator_pos(branch_loc); | |
| 352 int branch_sect = CodeBuffer::locator_sect(branch_loc); | |
| 353 address branch = cb->locator_address(branch_loc); | |
| 354 tty->print_cr("unbound label"); | |
| 355 tty->print("@ %d|%d ", branch_pos, branch_sect); | |
| 356 if (branch_sect == CodeBuffer::SECT_CONSTS) { | |
| 357 tty->print_cr(PTR_FORMAT, *(address*)branch); | |
| 358 continue; | |
| 359 } | |
| 360 masm->pd_print_patched_instruction(branch); | |
| 361 tty->cr(); | |
| 362 } | |
| 363 } | |
| 364 #endif // ndef PRODUCT |