Mercurial > hg > truffle
annotate src/share/vm/asm/codeBuffer.hpp @ 20435:094cbdffa87d
8054292: code comments leak in fastdebug builds
Summary: Added deallocation to destructor; hardened interface against misuse
Reviewed-by: kvn
| author | drchase |
|---|---|
| date | Fri, 29 Aug 2014 19:45:49 -0400 |
| parents | 78bbf4d43a14 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2014, 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 #ifndef SHARE_VM_ASM_CODEBUFFER_HPP |
| 26 #define SHARE_VM_ASM_CODEBUFFER_HPP | |
| 27 | |
| 28 #include "code/oopRecorder.hpp" | |
| 29 #include "code/relocInfo.hpp" | |
| 20435 | 30 #include "utilities/debug.hpp" |
| 1972 | 31 |
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32 class CodeStrings; |
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33 class PhaseCFG; |
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34 class Compile; |
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35 class BufferBlob; |
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36 class CodeBuffer; |
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37 class Label; |
| 0 | 38 |
| 39 class CodeOffsets: public StackObj { | |
| 40 public: | |
| 41 enum Entries { Entry, | |
| 42 Verified_Entry, | |
| 43 Frame_Complete, // Offset in the code where the frame setup is (for forte stackwalks) is complete | |
| 44 OSR_Entry, | |
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45 Dtrace_trap = OSR_Entry, // dtrace probes can never have an OSR entry so reuse it |
| 0 | 46 Exceptions, // Offset where exception handler lives |
| 47 Deopt, // Offset where deopt handler lives | |
| 1204 | 48 DeoptMH, // Offset where MethodHandle deopt handler lives |
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49 UnwindHandler, // Offset to default unwind handler |
| 0 | 50 max_Entries }; |
| 51 | |
| 52 // special value to note codeBlobs where profile (forte) stack walking is | |
| 53 // always dangerous and suspect. | |
| 54 | |
| 55 enum { frame_never_safe = -1 }; | |
| 56 | |
| 57 private: | |
| 58 int _values[max_Entries]; | |
| 59 | |
| 60 public: | |
| 61 CodeOffsets() { | |
| 1204 | 62 _values[Entry ] = 0; |
| 0 | 63 _values[Verified_Entry] = 0; |
| 64 _values[Frame_Complete] = frame_never_safe; | |
| 1204 | 65 _values[OSR_Entry ] = 0; |
| 66 _values[Exceptions ] = -1; | |
| 67 _values[Deopt ] = -1; | |
| 68 _values[DeoptMH ] = -1; | |
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69 _values[UnwindHandler ] = -1; |
| 0 | 70 } |
| 71 | |
| 72 int value(Entries e) { return _values[e]; } | |
| 73 void set_value(Entries e, int val) { _values[e] = val; } | |
| 74 }; | |
| 75 | |
| 76 // This class represents a stream of code and associated relocations. | |
| 77 // There are a few in each CodeBuffer. | |
| 78 // They are filled concurrently, and concatenated at the end. | |
| 79 class CodeSection VALUE_OBJ_CLASS_SPEC { | |
| 80 friend class CodeBuffer; | |
| 81 public: | |
| 82 typedef int csize_t; // code size type; would be size_t except for history | |
| 83 | |
| 84 private: | |
| 85 address _start; // first byte of contents (instructions) | |
| 86 address _mark; // user mark, usually an instruction beginning | |
| 87 address _end; // current end address | |
| 88 address _limit; // last possible (allocated) end address | |
| 89 relocInfo* _locs_start; // first byte of relocation information | |
| 90 relocInfo* _locs_end; // first byte after relocation information | |
| 91 relocInfo* _locs_limit; // first byte after relocation information buf | |
| 92 address _locs_point; // last relocated position (grows upward) | |
| 93 bool _locs_own; // did I allocate the locs myself? | |
| 94 bool _frozen; // no more expansion of this section | |
| 95 char _index; // my section number (SECT_INST, etc.) | |
| 96 CodeBuffer* _outer; // enclosing CodeBuffer | |
| 97 | |
| 98 // (Note: _locs_point used to be called _last_reloc_offset.) | |
| 99 | |
| 100 CodeSection() { | |
| 101 _start = NULL; | |
| 102 _mark = NULL; | |
| 103 _end = NULL; | |
| 104 _limit = NULL; | |
| 105 _locs_start = NULL; | |
| 106 _locs_end = NULL; | |
| 107 _locs_limit = NULL; | |
| 108 _locs_point = NULL; | |
| 109 _locs_own = false; | |
| 110 _frozen = false; | |
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111 debug_only(_index = (char)-1); |
| 0 | 112 debug_only(_outer = (CodeBuffer*)badAddress); |
| 113 } | |
| 114 | |
| 115 void initialize_outer(CodeBuffer* outer, int index) { | |
| 116 _outer = outer; | |
| 117 _index = index; | |
| 118 } | |
| 119 | |
| 120 void initialize(address start, csize_t size = 0) { | |
| 121 assert(_start == NULL, "only one init step, please"); | |
| 122 _start = start; | |
| 123 _mark = NULL; | |
| 124 _end = start; | |
| 125 | |
| 126 _limit = start + size; | |
| 127 _locs_point = start; | |
| 128 } | |
| 129 | |
| 130 void initialize_locs(int locs_capacity); | |
| 131 void expand_locs(int new_capacity); | |
| 132 void initialize_locs_from(const CodeSection* source_cs); | |
| 133 | |
| 134 // helper for CodeBuffer::expand() | |
| 135 void take_over_code_from(CodeSection* cs) { | |
| 136 _start = cs->_start; | |
| 137 _mark = cs->_mark; | |
| 138 _end = cs->_end; | |
| 139 _limit = cs->_limit; | |
| 140 _locs_point = cs->_locs_point; | |
| 141 } | |
| 142 | |
| 143 public: | |
| 144 address start() const { return _start; } | |
| 145 address mark() const { return _mark; } | |
| 146 address end() const { return _end; } | |
| 147 address limit() const { return _limit; } | |
| 148 csize_t size() const { return (csize_t)(_end - _start); } | |
| 149 csize_t mark_off() const { assert(_mark != NULL, "not an offset"); | |
| 150 return (csize_t)(_mark - _start); } | |
| 151 csize_t capacity() const { return (csize_t)(_limit - _start); } | |
| 152 csize_t remaining() const { return (csize_t)(_limit - _end); } | |
| 153 | |
| 154 relocInfo* locs_start() const { return _locs_start; } | |
| 155 relocInfo* locs_end() const { return _locs_end; } | |
| 156 int locs_count() const { return (int)(_locs_end - _locs_start); } | |
| 157 relocInfo* locs_limit() const { return _locs_limit; } | |
| 158 address locs_point() const { return _locs_point; } | |
| 159 csize_t locs_point_off() const{ return (csize_t)(_locs_point - _start); } | |
| 160 csize_t locs_capacity() const { return (csize_t)(_locs_limit - _locs_start); } | |
| 161 csize_t locs_remaining()const { return (csize_t)(_locs_limit - _locs_end); } | |
| 162 | |
| 163 int index() const { return _index; } | |
| 164 bool is_allocated() const { return _start != NULL; } | |
| 165 bool is_empty() const { return _start == _end; } | |
| 166 bool is_frozen() const { return _frozen; } | |
| 167 bool has_locs() const { return _locs_end != NULL; } | |
| 168 | |
| 169 CodeBuffer* outer() const { return _outer; } | |
| 170 | |
| 171 // is a given address in this section? (2nd version is end-inclusive) | |
| 172 bool contains(address pc) const { return pc >= _start && pc < _end; } | |
| 173 bool contains2(address pc) const { return pc >= _start && pc <= _end; } | |
| 174 bool allocates(address pc) const { return pc >= _start && pc < _limit; } | |
| 175 bool allocates2(address pc) const { return pc >= _start && pc <= _limit; } | |
| 176 | |
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177 void set_end(address pc) { assert(allocates2(pc), err_msg("not in CodeBuffer memory: " PTR_FORMAT " <= " PTR_FORMAT " <= " INTPTR_FORMAT, p2i(_start), p2i(pc), p2i(_limit))); _end = pc; } |
| 1846 | 178 void set_mark(address pc) { assert(contains2(pc), "not in codeBuffer"); |
| 0 | 179 _mark = pc; } |
| 180 void set_mark_off(int offset) { assert(contains2(offset+_start),"not in codeBuffer"); | |
| 181 _mark = offset + _start; } | |
| 182 void set_mark() { _mark = _end; } | |
| 183 void clear_mark() { _mark = NULL; } | |
| 184 | |
| 185 void set_locs_end(relocInfo* p) { | |
| 186 assert(p <= locs_limit(), "locs data fits in allocated buffer"); | |
| 187 _locs_end = p; | |
| 188 } | |
| 189 void set_locs_point(address pc) { | |
| 190 assert(pc >= locs_point(), "relocation addr may not decrease"); | |
| 191 assert(allocates2(pc), "relocation addr must be in this section"); | |
| 192 _locs_point = pc; | |
| 193 } | |
| 194 | |
| 1748 | 195 // Code emission |
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196 void emit_int8 ( int8_t x) { *((int8_t*) end()) = x; set_end(end() + sizeof(int8_t)); } |
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197 void emit_int16( int16_t x) { *((int16_t*) end()) = x; set_end(end() + sizeof(int16_t)); } |
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198 void emit_int32( int32_t x) { *((int32_t*) end()) = x; set_end(end() + sizeof(int32_t)); } |
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199 void emit_int64( int64_t x) { *((int64_t*) end()) = x; set_end(end() + sizeof(int64_t)); } |
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200 |
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201 void emit_float( jfloat x) { *((jfloat*) end()) = x; set_end(end() + sizeof(jfloat)); } |
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202 void emit_double(jdouble x) { *((jdouble*) end()) = x; set_end(end() + sizeof(jdouble)); } |
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203 void emit_address(address x) { *((address*) end()) = x; set_end(end() + sizeof(address)); } |
| 1748 | 204 |
| 0 | 205 // Share a scratch buffer for relocinfo. (Hacky; saves a resource allocation.) |
| 206 void initialize_shared_locs(relocInfo* buf, int length); | |
| 207 | |
| 208 // Manage labels and their addresses. | |
| 209 address target(Label& L, address branch_pc); | |
| 210 | |
| 211 // Emit a relocation. | |
| 212 void relocate(address at, RelocationHolder const& rspec, int format = 0); | |
| 213 void relocate(address at, relocInfo::relocType rtype, int format = 0) { | |
| 214 if (rtype != relocInfo::none) | |
| 215 relocate(at, Relocation::spec_simple(rtype), format); | |
| 216 } | |
| 217 | |
| 218 // alignment requirement for starting offset | |
| 219 // Requirements are that the instruction area and the | |
| 220 // stubs area must start on CodeEntryAlignment, and | |
| 221 // the ctable on sizeof(jdouble) | |
| 222 int alignment() const { return MAX2((int)sizeof(jdouble), (int)CodeEntryAlignment); } | |
| 223 | |
| 224 // Slop between sections, used only when allocating temporary BufferBlob buffers. | |
| 225 static csize_t end_slop() { return MAX2((int)sizeof(jdouble), (int)CodeEntryAlignment); } | |
| 226 | |
| 227 csize_t align_at_start(csize_t off) const { return (csize_t) align_size_up(off, alignment()); } | |
| 228 | |
| 229 // Mark a section frozen. Assign its remaining space to | |
| 230 // the following section. It will never expand after this point. | |
| 231 inline void freeze(); // { _outer->freeze_section(this); } | |
| 232 | |
| 233 // Ensure there's enough space left in the current section. | |
| 234 // Return true if there was an expansion. | |
| 235 bool maybe_expand_to_ensure_remaining(csize_t amount); | |
| 236 | |
| 237 #ifndef PRODUCT | |
| 238 void decode(); | |
| 239 void dump(); | |
| 240 void print(const char* name); | |
| 241 #endif //PRODUCT | |
| 242 }; | |
| 243 | |
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244 class CodeString; |
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245 class CodeStrings VALUE_OBJ_CLASS_SPEC { |
| 0 | 246 private: |
| 247 #ifndef PRODUCT | |
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248 CodeString* _strings; |
| 20435 | 249 #ifdef ASSERT |
| 250 // Becomes true after copy-out, forbids further use. | |
| 251 bool _defunct; // Zero bit pattern is "valid", see memset call in decode_env::decode_env | |
| 252 #endif | |
| 0 | 253 #endif |
| 254 | |
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255 CodeString* find(intptr_t offset) const; |
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256 CodeString* find_last(intptr_t offset) const; |
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257 |
| 20435 | 258 void set_null_and_invalidate() { |
| 259 #ifndef PRODUCT | |
| 260 _strings = NULL; | |
| 261 #ifdef ASSERT | |
| 262 _defunct = true; | |
| 263 #endif | |
| 264 #endif | |
| 265 } | |
| 266 | |
| 0 | 267 public: |
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268 CodeStrings() { |
| 0 | 269 #ifndef PRODUCT |
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270 _strings = NULL; |
| 20435 | 271 #ifdef ASSERT |
| 272 _defunct = false; | |
| 273 #endif | |
| 274 #endif | |
| 275 } | |
| 276 | |
| 277 bool is_null() { | |
| 278 #ifdef ASSERT | |
| 279 return _strings == NULL; | |
| 280 #else | |
| 281 return true; | |
| 0 | 282 #endif |
| 283 } | |
| 284 | |
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285 const char* add_string(const char * string) PRODUCT_RETURN_(return NULL;); |
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286 |
| 0 | 287 void add_comment(intptr_t offset, const char * comment) PRODUCT_RETURN; |
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288 void print_block_comment(outputStream* stream, intptr_t offset) const PRODUCT_RETURN; |
| 20435 | 289 // MOVE strings from other to this; invalidate other. |
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290 void assign(CodeStrings& other) PRODUCT_RETURN; |
| 20435 | 291 // COPY strings from other to this; leave other valid. |
| 292 void copy(CodeStrings& other) PRODUCT_RETURN; | |
| 0 | 293 void free() PRODUCT_RETURN; |
| 20435 | 294 // Guarantee that _strings are used at most once; assign invalidates a buffer. |
| 295 inline void check_valid() const { | |
| 296 #ifdef ASSERT | |
| 297 assert(!_defunct, "Use of invalid CodeStrings"); | |
| 298 #endif | |
| 299 } | |
| 0 | 300 }; |
| 301 | |
| 302 // A CodeBuffer describes a memory space into which assembly | |
| 303 // code is generated. This memory space usually occupies the | |
| 304 // interior of a single BufferBlob, but in some cases it may be | |
| 305 // an arbitrary span of memory, even outside the code cache. | |
| 306 // | |
| 307 // A code buffer comes in two variants: | |
| 308 // | |
| 309 // (1) A CodeBuffer referring to an already allocated piece of memory: | |
| 310 // This is used to direct 'static' code generation (e.g. for interpreter | |
| 311 // or stubroutine generation, etc.). This code comes with NO relocation | |
| 312 // information. | |
| 313 // | |
| 314 // (2) A CodeBuffer referring to a piece of memory allocated when the | |
| 315 // CodeBuffer is allocated. This is used for nmethod generation. | |
| 316 // | |
| 317 // The memory can be divided up into several parts called sections. | |
| 318 // Each section independently accumulates code (or data) an relocations. | |
| 319 // Sections can grow (at the expense of a reallocation of the BufferBlob | |
| 320 // and recopying of all active sections). When the buffered code is finally | |
| 321 // written to an nmethod (or other CodeBlob), the contents (code, data, | |
| 322 // and relocations) of the sections are padded to an alignment and concatenated. | |
| 323 // Instructions and data in one section can contain relocatable references to | |
| 324 // addresses in a sibling section. | |
| 325 | |
| 326 class CodeBuffer: public StackObj { | |
| 327 friend class CodeSection; | |
| 328 | |
| 329 private: | |
| 330 // CodeBuffers must be allocated on the stack except for a single | |
| 331 // special case during expansion which is handled internally. This | |
| 332 // is done to guarantee proper cleanup of resources. | |
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333 void* operator new(size_t size) throw() { return ResourceObj::operator new(size); } |
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334 void operator delete(void* p) { ShouldNotCallThis(); } |
| 0 | 335 |
| 336 public: | |
| 337 typedef int csize_t; // code size type; would be size_t except for history | |
| 338 enum { | |
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339 // Here is the list of all possible sections. The order reflects |
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340 // the final layout. |
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341 SECT_FIRST = 0, |
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342 SECT_CONSTS = SECT_FIRST, // Non-instruction data: Floats, jump tables, etc. |
| 0 | 343 SECT_INSTS, // Executable instructions. |
| 344 SECT_STUBS, // Outbound trampolines for supporting call sites. | |
| 345 SECT_LIMIT, SECT_NONE = -1 | |
| 346 }; | |
| 347 | |
| 348 private: | |
| 349 enum { | |
| 350 sect_bits = 2, // assert (SECT_LIMIT <= (1<<sect_bits)) | |
| 351 sect_mask = (1<<sect_bits)-1 | |
| 352 }; | |
| 353 | |
| 354 const char* _name; | |
| 355 | |
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356 CodeSection _consts; // constants, jump tables |
| 0 | 357 CodeSection _insts; // instructions (the main section) |
| 358 CodeSection _stubs; // stubs (call site support), deopt, exception handling | |
| 359 | |
| 360 CodeBuffer* _before_expand; // dead buffer, from before the last expansion | |
| 361 | |
| 362 BufferBlob* _blob; // optional buffer in CodeCache for generated code | |
| 363 address _total_start; // first address of combined memory buffer | |
| 364 csize_t _total_size; // size in bytes of combined memory buffer | |
| 365 | |
| 366 OopRecorder* _oop_recorder; | |
| 20435 | 367 CodeStrings _code_strings; |
| 0 | 368 OopRecorder _default_oop_recorder; // override with initialize_oop_recorder |
| 369 Arena* _overflow_arena; | |
| 370 | |
| 371 address _decode_begin; // start address for decode | |
| 372 address decode_begin(); | |
| 373 | |
| 374 void initialize_misc(const char * name) { | |
| 375 // all pointers other than code_start/end and those inside the sections | |
| 376 assert(name != NULL, "must have a name"); | |
| 377 _name = name; | |
| 378 _before_expand = NULL; | |
| 379 _blob = NULL; | |
| 380 _oop_recorder = NULL; | |
| 381 _decode_begin = NULL; | |
| 382 _overflow_arena = NULL; | |
| 383 } | |
| 384 | |
| 385 void initialize(address code_start, csize_t code_size) { | |
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386 _consts.initialize_outer(this, SECT_CONSTS); |
| 0 | 387 _insts.initialize_outer(this, SECT_INSTS); |
| 388 _stubs.initialize_outer(this, SECT_STUBS); | |
| 389 _total_start = code_start; | |
| 390 _total_size = code_size; | |
| 391 // Initialize the main section: | |
| 392 _insts.initialize(code_start, code_size); | |
| 393 assert(!_stubs.is_allocated(), "no garbage here"); | |
| 394 assert(!_consts.is_allocated(), "no garbage here"); | |
| 395 _oop_recorder = &_default_oop_recorder; | |
| 396 } | |
| 397 | |
| 398 void initialize_section_size(CodeSection* cs, csize_t size); | |
| 399 | |
| 400 void freeze_section(CodeSection* cs); | |
| 401 | |
| 402 // helper for CodeBuffer::expand() | |
| 403 void take_over_code_from(CodeBuffer* cs); | |
| 404 | |
| 405 // ensure sections are disjoint, ordered, and contained in the blob | |
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406 void verify_section_allocation(); |
| 0 | 407 |
| 408 // copies combined relocations to the blob, returns bytes copied | |
| 409 // (if target is null, it is a dry run only, just for sizing) | |
| 410 csize_t copy_relocations_to(CodeBlob* blob) const; | |
| 411 | |
| 412 // copies combined code to the blob (assumes relocs are already in there) | |
| 413 void copy_code_to(CodeBlob* blob); | |
| 414 | |
| 415 // moves code sections to new buffer (assumes relocs are already in there) | |
| 416 void relocate_code_to(CodeBuffer* cb) const; | |
| 417 | |
| 418 // set up a model of the final layout of my contents | |
| 419 void compute_final_layout(CodeBuffer* dest) const; | |
| 420 | |
| 421 // Expand the given section so at least 'amount' is remaining. | |
| 422 // Creates a new, larger BufferBlob, and rewrites the code & relocs. | |
| 423 void expand(CodeSection* which_cs, csize_t amount); | |
| 424 | |
| 425 // Helper for expand. | |
| 426 csize_t figure_expanded_capacities(CodeSection* which_cs, csize_t amount, csize_t* new_capacity); | |
| 427 | |
| 428 public: | |
| 429 // (1) code buffer referring to pre-allocated instruction memory | |
| 1748 | 430 CodeBuffer(address code_start, csize_t code_size) { |
| 431 assert(code_start != NULL, "sanity"); | |
| 432 initialize_misc("static buffer"); | |
| 433 initialize(code_start, code_size); | |
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434 verify_section_allocation(); |
| 1748 | 435 } |
| 0 | 436 |
| 1748 | 437 // (2) CodeBuffer referring to pre-allocated CodeBlob. |
| 438 CodeBuffer(CodeBlob* blob); | |
| 439 | |
| 440 // (3) code buffer allocating codeBlob memory for code & relocation | |
| 0 | 441 // info but with lazy initialization. The name must be something |
| 442 // informative. | |
| 443 CodeBuffer(const char* name) { | |
| 444 initialize_misc(name); | |
| 445 } | |
| 446 | |
| 447 | |
| 1748 | 448 // (4) code buffer allocating codeBlob memory for code & relocation |
| 0 | 449 // info. The name must be something informative and code_size must |
| 450 // include both code and stubs sizes. | |
| 451 CodeBuffer(const char* name, csize_t code_size, csize_t locs_size) { | |
| 452 initialize_misc(name); | |
| 453 initialize(code_size, locs_size); | |
| 454 } | |
| 455 | |
| 456 ~CodeBuffer(); | |
| 457 | |
| 1748 | 458 // Initialize a CodeBuffer constructed using constructor 3. Using |
| 459 // constructor 4 is equivalent to calling constructor 3 and then | |
| 0 | 460 // calling this method. It's been factored out for convenience of |
| 461 // construction. | |
| 462 void initialize(csize_t code_size, csize_t locs_size); | |
| 463 | |
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464 CodeSection* consts() { return &_consts; } |
| 0 | 465 CodeSection* insts() { return &_insts; } |
| 466 CodeSection* stubs() { return &_stubs; } | |
| 467 | |
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468 // present sections in order; return NULL at end; consts is #0, etc. |
| 0 | 469 CodeSection* code_section(int n) { |
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470 // This makes the slightly questionable but portable assumption |
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471 // that the various members (_consts, _insts, _stubs, etc.) are |
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472 // adjacent in the layout of CodeBuffer. |
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473 CodeSection* cs = &_consts + n; |
| 0 | 474 assert(cs->index() == n || !cs->is_allocated(), "sanity"); |
| 475 return cs; | |
| 476 } | |
| 477 const CodeSection* code_section(int n) const { // yucky const stuff | |
| 478 return ((CodeBuffer*)this)->code_section(n); | |
| 479 } | |
| 480 static const char* code_section_name(int n); | |
| 481 int section_index_of(address addr) const; | |
| 482 bool contains(address addr) const { | |
| 483 // handy for debugging | |
| 484 return section_index_of(addr) > SECT_NONE; | |
| 485 } | |
| 486 | |
| 487 // A stable mapping between 'locators' (small ints) and addresses. | |
| 488 static int locator_pos(int locator) { return locator >> sect_bits; } | |
| 489 static int locator_sect(int locator) { return locator & sect_mask; } | |
| 490 static int locator(int pos, int sect) { return (pos << sect_bits) | sect; } | |
| 491 int locator(address addr) const; | |
| 492 address locator_address(int locator) const; | |
| 493 | |
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494 // Heuristic for pre-packing the taken/not-taken bit of a predicted branch. |
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495 bool is_backward_branch(Label& L); |
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496 |
| 0 | 497 // Properties |
| 498 const char* name() const { return _name; } | |
| 499 CodeBuffer* before_expand() const { return _before_expand; } | |
| 500 BufferBlob* blob() const { return _blob; } | |
| 501 void set_blob(BufferBlob* blob); | |
| 502 void free_blob(); // Free the blob, if we own one. | |
| 503 | |
| 504 // Properties relative to the insts section: | |
| 1748 | 505 address insts_begin() const { return _insts.start(); } |
| 506 address insts_end() const { return _insts.end(); } | |
| 507 void set_insts_end(address end) { _insts.set_end(end); } | |
| 508 address insts_limit() const { return _insts.limit(); } | |
| 509 address insts_mark() const { return _insts.mark(); } | |
| 510 void set_insts_mark() { _insts.set_mark(); } | |
| 511 void clear_insts_mark() { _insts.clear_mark(); } | |
| 0 | 512 |
| 513 // is there anything in the buffer other than the current section? | |
| 1748 | 514 bool is_pure() const { return insts_size() == total_content_size(); } |
| 0 | 515 |
| 516 // size in bytes of output so far in the insts sections | |
| 1748 | 517 csize_t insts_size() const { return _insts.size(); } |
| 0 | 518 |
| 1748 | 519 // same as insts_size(), except that it asserts there is no non-code here |
| 520 csize_t pure_insts_size() const { assert(is_pure(), "no non-code"); | |
| 521 return insts_size(); } | |
| 0 | 522 // capacity in bytes of the insts sections |
| 1748 | 523 csize_t insts_capacity() const { return _insts.capacity(); } |
| 0 | 524 |
| 525 // number of bytes remaining in the insts section | |
| 1748 | 526 csize_t insts_remaining() const { return _insts.remaining(); } |
| 0 | 527 |
| 528 // is a given address in the insts section? (2nd version is end-inclusive) | |
| 1748 | 529 bool insts_contains(address pc) const { return _insts.contains(pc); } |
| 530 bool insts_contains2(address pc) const { return _insts.contains2(pc); } | |
| 0 | 531 |
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532 // Record any extra oops required to keep embedded metadata alive |
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533 void finalize_oop_references(methodHandle method); |
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534 |
| 1748 | 535 // Allocated size in all sections, when aligned and concatenated |
| 536 // (this is the eventual state of the content in its final | |
| 537 // CodeBlob). | |
| 538 csize_t total_content_size() const; | |
| 0 | 539 |
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540 // Combined offset (relative to start of first section) of given |
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541 // section, as eventually found in the final CodeBlob. |
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542 csize_t total_offset_of(CodeSection* cs) const; |
| 0 | 543 |
| 544 // allocated size of all relocation data, including index, rounded up | |
| 545 csize_t total_relocation_size() const; | |
| 546 | |
| 547 // allocated size of any and all recorded oops | |
| 548 csize_t total_oop_size() const { | |
| 549 OopRecorder* recorder = oop_recorder(); | |
| 550 return (recorder == NULL)? 0: recorder->oop_size(); | |
| 551 } | |
| 552 | |
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553 // allocated size of any and all recorded metadata |
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554 csize_t total_metadata_size() const { |
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555 OopRecorder* recorder = oop_recorder(); |
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556 return (recorder == NULL)? 0: recorder->metadata_size(); |
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557 } |
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558 |
| 0 | 559 // Configuration functions, called immediately after the CB is constructed. |
| 560 // The section sizes are subtracted from the original insts section. | |
| 561 // Note: Call them in reverse section order, because each steals from insts. | |
| 562 void initialize_consts_size(csize_t size) { initialize_section_size(&_consts, size); } | |
| 563 void initialize_stubs_size(csize_t size) { initialize_section_size(&_stubs, size); } | |
| 564 // Override default oop recorder. | |
| 565 void initialize_oop_recorder(OopRecorder* r); | |
| 566 | |
| 567 OopRecorder* oop_recorder() const { return _oop_recorder; } | |
| 20435 | 568 CodeStrings& strings() { return _code_strings; } |
| 569 | |
| 570 void free_strings() { | |
| 571 if (!_code_strings.is_null()) { | |
| 572 _code_strings.free(); // sets _strings Null as a side-effect. | |
| 573 } | |
| 574 } | |
| 0 | 575 |
| 576 // Code generation | |
| 577 void relocate(address at, RelocationHolder const& rspec, int format = 0) { | |
| 578 _insts.relocate(at, rspec, format); | |
| 579 } | |
| 580 void relocate(address at, relocInfo::relocType rtype, int format = 0) { | |
| 581 _insts.relocate(at, rtype, format); | |
| 582 } | |
| 583 | |
| 584 // Management of overflow storage for binding of Labels. | |
| 585 GrowableArray<int>* create_patch_overflow(); | |
| 586 | |
| 587 // NMethod generation | |
| 588 void copy_code_and_locs_to(CodeBlob* blob) { | |
| 589 assert(blob != NULL, "sane"); | |
| 590 copy_relocations_to(blob); | |
| 591 copy_code_to(blob); | |
| 592 } | |
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593 void copy_values_to(nmethod* nm) { |
| 0 | 594 if (!oop_recorder()->is_unused()) { |
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595 oop_recorder()->copy_values_to(nm); |
| 0 | 596 } |
| 597 } | |
| 598 | |
| 599 // Transform an address from the code in this code buffer to a specified code buffer | |
| 600 address transform_address(const CodeBuffer &cb, address addr) const; | |
| 601 | |
| 602 void block_comment(intptr_t offset, const char * comment) PRODUCT_RETURN; | |
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603 const char* code_string(const char* str) PRODUCT_RETURN_(return NULL;); |
| 0 | 604 |
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605 // Log a little info about section usage in the CodeBuffer |
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606 void log_section_sizes(const char* name); |
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607 |
| 0 | 608 #ifndef PRODUCT |
| 609 public: | |
| 610 // Printing / Decoding | |
| 611 // decodes from decode_begin() to code_end() and sets decode_begin to end | |
| 612 void decode(); | |
| 613 void decode_all(); // decodes all the code | |
| 614 void skip_decode(); // sets decode_begin to code_end(); | |
| 615 void print(); | |
| 616 #endif | |
| 617 | |
| 618 | |
| 619 // The following header contains architecture-specific implementations | |
| 1972 | 620 #ifdef TARGET_ARCH_x86 |
| 621 # include "codeBuffer_x86.hpp" | |
| 622 #endif | |
| 623 #ifdef TARGET_ARCH_sparc | |
| 624 # include "codeBuffer_sparc.hpp" | |
| 625 #endif | |
| 626 #ifdef TARGET_ARCH_zero | |
| 627 # include "codeBuffer_zero.hpp" | |
| 628 #endif | |
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629 #ifdef TARGET_ARCH_arm |
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630 # include "codeBuffer_arm.hpp" |
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631 #endif |
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632 #ifdef TARGET_ARCH_ppc |
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633 # include "codeBuffer_ppc.hpp" |
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634 #endif |
| 1972 | 635 |
| 0 | 636 }; |
| 637 | |
| 638 | |
| 639 inline void CodeSection::freeze() { | |
| 640 _outer->freeze_section(this); | |
| 641 } | |
| 642 | |
| 643 inline bool CodeSection::maybe_expand_to_ensure_remaining(csize_t amount) { | |
| 644 if (remaining() < amount) { _outer->expand(this, amount); return true; } | |
| 645 return false; | |
| 646 } | |
| 1972 | 647 |
| 648 #endif // SHARE_VM_ASM_CODEBUFFER_HPP |