1 /*
2 * Copyright (c) 1998, 2015, Oracle and/or its affiliates. All rights reserved.
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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_CODE_CODEBLOB_HPP
26 #define SHARE_VM_CODE_CODEBLOB_HPP
27
28 #include "asm/codeBuffer.hpp"
29 #include "compiler/oopMap.hpp"
30 #include "runtime/frame.hpp"
31 #include "runtime/handles.hpp"
32
33 // CodeBlob Types
34 // Used in the CodeCache to assign CodeBlobs to different CodeHeaps
35 struct CodeBlobType {
36 enum {
37 MethodNonProfiled = 0, // Execution level 1 and 4 (non-profiled) nmethods (including native nmethods)
38 MethodProfiled = 1, // Execution level 2 and 3 (profiled) nmethods
39 NonNMethod = 2, // Non-nmethods like Buffers, Adapters and Runtime Stubs
40 All = 3, // All types (No code cache segmentation)
41 Pregenerated = 4, // Special blobs, managed by CodeCacheExtensions
42 NumTypes = 5 // Number of CodeBlobTypes
43 };
44 };
45
46 // CodeBlob - superclass for all entries in the CodeCache.
47 //
48 // Suptypes are:
49 // nmethod : Compiled Java methods (include method that calls to native code)
50 // RuntimeStub : Call to VM runtime methods
51 // DeoptimizationBlob : Used for deoptimizatation
52 // ExceptionBlob : Used for stack unrolling
53 // SafepointBlob : Used to handle illegal instruction exceptions
54 //
55 //
56 // Layout:
57 // - header
58 // - relocation
59 // - content space
60 // - instruction space
61 // - data space
62 class DeoptimizationBlob;
63
64 class CodeBlob VALUE_OBJ_CLASS_SPEC {
65
66 friend class VMStructs;
67 friend class JVMCIVMStructs;
68 friend class CodeCacheDumper;
69
70 private:
71 const char* _name;
72 int _size; // total size of CodeBlob in bytes
73 int _header_size; // size of header (depends on subclass)
74 int _relocation_size; // size of relocation
75 int _content_offset; // offset to where content region begins (this includes consts, insts, stubs)
76 int _code_offset; // offset to where instructions region begins (this includes insts, stubs)
77 int _frame_complete_offset; // instruction offsets in [0.._frame_complete_offset) have
78 // not finished setting up their frame. Beware of pc's in
79 // that range. There is a similar range(s) on returns
80 // which we don't detect.
81 int _data_offset; // offset to where data region begins
82 int _frame_size; // size of stack frame
83 ImmutableOopMapSet* _oop_maps; // OopMap for this CodeBlob
84 CodeStrings _strings;
85
86 public:
87 // Returns the space needed for CodeBlob
88 static unsigned int allocation_size(CodeBuffer* cb, int header_size);
89 static unsigned int align_code_offset(int offset);
90
91 // Creation
92 // a) simple CodeBlob
93 // frame_complete is the offset from the beginning of the instructions
94 // to where the frame setup (from stackwalk viewpoint) is complete.
95 CodeBlob(const char* name, int header_size, int size, int frame_complete, int locs_size);
96
97 // b) full CodeBlob
98 CodeBlob(
99 const char* name,
100 CodeBuffer* cb,
101 int header_size,
102 int size,
103 int frame_complete,
104 int frame_size,
105 OopMapSet* oop_maps
106 );
107
108 // Deletion
109 void flush();
110
111 // Typing
112 virtual bool is_buffer_blob() const { return false; }
113 virtual bool is_nmethod() const { return false; }
114 virtual bool is_runtime_stub() const { return false; }
115 virtual bool is_deoptimization_stub() const { return false; }
116 virtual bool is_uncommon_trap_stub() const { return false; }
117 virtual bool is_exception_stub() const { return false; }
118 virtual bool is_safepoint_stub() const { return false; }
119 virtual bool is_adapter_blob() const { return false; }
120 virtual bool is_method_handles_adapter_blob() const { return false; }
121
122 virtual bool is_compiled_by_c2() const { return false; }
123 virtual bool is_compiled_by_c1() const { return false; }
124 virtual bool is_compiled_by_jvmci() const { return false; }
125
126 // Casting
127 nmethod* as_nmethod_or_null() { return is_nmethod() ? (nmethod*) this : NULL; }
128
129 // Boundaries
130 address header_begin() const { return (address) this; }
131 address header_end() const { return ((address) this) + _header_size; };
132 relocInfo* relocation_begin() const { return (relocInfo*) header_end(); };
133 relocInfo* relocation_end() const { return (relocInfo*)(header_end() + _relocation_size); }
134 address content_begin() const { return (address) header_begin() + _content_offset; }
135 address content_end() const { return (address) header_begin() + _data_offset; }
136 address code_begin() const { return (address) header_begin() + _code_offset; }
137 address code_end() const { return (address) header_begin() + _data_offset; }
138 address data_begin() const { return (address) header_begin() + _data_offset; }
139 address data_end() const { return (address) header_begin() + _size; }
140
141 // Offsets
142 int relocation_offset() const { return _header_size; }
143 int content_offset() const { return _content_offset; }
144 int code_offset() const { return _code_offset; }
145 int data_offset() const { return _data_offset; }
146
147 // Sizes
148 int size() const { return _size; }
149 int header_size() const { return _header_size; }
150 int relocation_size() const { return (address) relocation_end() - (address) relocation_begin(); }
151 int content_size() const { return content_end() - content_begin(); }
152 int code_size() const { return code_end() - code_begin(); }
153 int data_size() const { return data_end() - data_begin(); }
154
155 // Containment
156 bool blob_contains(address addr) const { return header_begin() <= addr && addr < data_end(); }
157 bool relocation_contains(relocInfo* addr) const{ return relocation_begin() <= addr && addr < relocation_end(); }
158 bool content_contains(address addr) const { return content_begin() <= addr && addr < content_end(); }
159 bool code_contains(address addr) const { return code_begin() <= addr && addr < code_end(); }
160 bool data_contains(address addr) const { return data_begin() <= addr && addr < data_end(); }
161 bool contains(address addr) const { return content_contains(addr); }
162 bool is_frame_complete_at(address addr) const { return code_contains(addr) &&
163 addr >= code_begin() + _frame_complete_offset; }
164
165 // CodeCache support: really only used by the nmethods, but in order to get
166 // asserts and certain bookkeeping to work in the CodeCache they are defined
167 // virtual here.
168 virtual bool is_zombie() const { return false; }
169 virtual bool is_locked_by_vm() const { return false; }
170
171 virtual bool is_unloaded() const { return false; }
172 virtual bool is_not_entrant() const { return false; }
173
174 // GC support
175 virtual bool is_alive() const = 0;
176
177 // OopMap for frame
178 ImmutableOopMapSet* oop_maps() const { return _oop_maps; }
179 void set_oop_maps(OopMapSet* p);
180 const ImmutableOopMap* oop_map_for_return_address(address return_address);
181 virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { ShouldNotReachHere(); }
182
183 // Frame support
184 int frame_size() const { return _frame_size; }
185 void set_frame_size(int size) { _frame_size = size; }
186
187 // Returns true, if the next frame is responsible for GC'ing oops passed as arguments
188 virtual bool caller_must_gc_arguments(JavaThread* thread) const { return false; }
189
190 // Naming
191 const char* name() const { return _name; }
192 void set_name(const char* name) { _name = name; }
193
194 // Debugging
195 virtual void verify();
196 void print() const { print_on(tty); }
197 virtual void print_on(outputStream* st) const;
198 virtual void print_value_on(outputStream* st) const;
199 void print_code();
200
201 // Deal with Disassembler, VTune, Forte, JvmtiExport, MemoryService.
202 static void trace_new_stub(CodeBlob* blob, const char* name1, const char* name2 = "");
203
204 // Print the comment associated with offset on stream, if there is one
205 virtual void print_block_comment(outputStream* stream, address block_begin) const {
206 intptr_t offset = (intptr_t)(block_begin - code_begin());
207 _strings.print_block_comment(stream, offset);
208 }
209
210 // Transfer ownership of comments to this CodeBlob
211 void set_strings(CodeStrings& strings) {
212 _strings.assign(strings);
213 }
214
215 static ByteSize name_field_offset() {
216 return byte_offset_of(CodeBlob, _name);
217 }
218
219 static ByteSize oop_maps_field_offset() {
220 return byte_offset_of(CodeBlob, _oop_maps);
221 }
222 };
223
224 class WhiteBox;
225 //----------------------------------------------------------------------------------------------------
226 // BufferBlob: used to hold non-relocatable machine code such as the interpreter, stubroutines, etc.
227
228 class BufferBlob: public CodeBlob {
229 friend class VMStructs;
230 friend class AdapterBlob;
231 friend class MethodHandlesAdapterBlob;
232 friend class WhiteBox;
233
234 private:
235 // Creation support
236 BufferBlob(const char* name, int size);
237 BufferBlob(const char* name, int size, CodeBuffer* cb);
238 BufferBlob(const char* name, int size, CodeBuffer* cb, int frame_complete, int frame_size, OopMapSet* oop_maps);
239
240 void* operator new(size_t s, unsigned size) throw();
241
242 public:
243 // Creation
244 static BufferBlob* create(const char* name, int buffer_size);
245 static BufferBlob* create(const char* name, CodeBuffer* cb);
246
247 static void free(BufferBlob* buf);
248
249 // Typing
250 virtual bool is_buffer_blob() const { return true; }
251
252 // GC/Verification support
253 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
254 bool is_alive() const { return true; }
255
256 void verify();
257 void print_on(outputStream* st) const;
258 void print_value_on(outputStream* st) const;
259 };
260
261
262 //----------------------------------------------------------------------------------------------------
263 // AdapterBlob: used to hold C2I/I2C adapters
264
265 class AdapterBlob: public BufferBlob {
266 private:
267 AdapterBlob(int size, CodeBuffer* cb, int frame_complete, int frame_size, OopMapSet* oop_maps);
268
269 public:
270 // Creation
271 static AdapterBlob* create(CodeBuffer* cb,
272 int frame_complete,
273 int frame_size,
274 OopMapSet* oop_maps);
275
276 // Typing
277 virtual bool is_adapter_blob() const { return true; }
278
279 bool caller_must_gc_arguments(JavaThread* thread) const { return true; }
280 };
281
282
283 //----------------------------------------------------------------------------------------------------
284 // MethodHandlesAdapterBlob: used to hold MethodHandles adapters
285
286 class MethodHandlesAdapterBlob: public BufferBlob {
287 private:
288 MethodHandlesAdapterBlob(int size) : BufferBlob("MethodHandles adapters", size) {}
289
290 public:
291 // Creation
292 static MethodHandlesAdapterBlob* create(int buffer_size);
293
294 // Typing
295 virtual bool is_method_handles_adapter_blob() const { return true; }
296 };
297
298
299 //----------------------------------------------------------------------------------------------------
300 // RuntimeStub: describes stubs used by compiled code to call a (static) C++ runtime routine
301
302 class RuntimeStub: public CodeBlob {
303 friend class VMStructs;
304 private:
305 bool _caller_must_gc_arguments;
306
307 // Creation support
308 RuntimeStub(
309 const char* name,
310 CodeBuffer* cb,
311 int size,
312 int frame_complete,
313 int frame_size,
314 OopMapSet* oop_maps,
315 bool caller_must_gc_arguments
316 );
317
318 void* operator new(size_t s, unsigned size) throw();
319
320 public:
321 // Creation
322 static RuntimeStub* new_runtime_stub(
323 const char* stub_name,
324 CodeBuffer* cb,
325 int frame_complete,
326 int frame_size,
327 OopMapSet* oop_maps,
328 bool caller_must_gc_arguments
329 );
330
331 // Typing
332 bool is_runtime_stub() const { return true; }
333
334 // GC support
335 bool caller_must_gc_arguments(JavaThread* thread) const { return _caller_must_gc_arguments; }
336
337 address entry_point() { return code_begin(); }
338
339 // GC/Verification support
340 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ }
341 bool is_alive() const { return true; }
342
343 void verify();
344 void print_on(outputStream* st) const;
345 void print_value_on(outputStream* st) const;
346 };
347
348
349 //----------------------------------------------------------------------------------------------------
350 // Super-class for all blobs that exist in only one instance. Implements default behaviour.
351
352 class SingletonBlob: public CodeBlob {
353 friend class VMStructs;
354
355 protected:
356 void* operator new(size_t s, unsigned size) throw();
357
358 public:
359 SingletonBlob(
360 const char* name,
361 CodeBuffer* cb,
362 int header_size,
363 int size,
364 int frame_size,
365 OopMapSet* oop_maps
366 )
367 : CodeBlob(name, cb, header_size, size, CodeOffsets::frame_never_safe, frame_size, oop_maps)
368 {};
369
370 address entry_point() { return code_begin(); }
371
372 bool is_alive() const { return true; }
373
374 void verify(); // does nothing
375 void print_on(outputStream* st) const;
376 void print_value_on(outputStream* st) const;
377 };
378
379
380 //----------------------------------------------------------------------------------------------------
381 // DeoptimizationBlob
382
383 class DeoptimizationBlob: public SingletonBlob {
384 friend class VMStructs;
385 friend class JVMCIVMStructs;
386 private:
387 int _unpack_offset;
388 int _unpack_with_exception;
389 int _unpack_with_reexecution;
390
391 int _unpack_with_exception_in_tls;
392
393 #if INCLUDE_JVMCI
394 // Offsets when JVMCI calls uncommon_trap.
395 int _uncommon_trap_offset;
396 int _implicit_exception_uncommon_trap_offset;
397 #endif
398
399 // Creation support
400 DeoptimizationBlob(
401 CodeBuffer* cb,
402 int size,
403 OopMapSet* oop_maps,
404 int unpack_offset,
405 int unpack_with_exception_offset,
406 int unpack_with_reexecution_offset,
407 int frame_size
408 );
409
410 public:
411 // Creation
412 static DeoptimizationBlob* create(
413 CodeBuffer* cb,
414 OopMapSet* oop_maps,
415 int unpack_offset,
416 int unpack_with_exception_offset,
417 int unpack_with_reexecution_offset,
418 int frame_size
419 );
420
421 // Typing
422 bool is_deoptimization_stub() const { return true; }
423 bool exception_address_is_unpack_entry(address pc) const {
424 address unpack_pc = unpack();
425 return (pc == unpack_pc || (pc + frame::pc_return_offset) == unpack_pc);
426 }
427
428 // GC for args
429 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* Nothing to do */ }
430
431 // Printing
432 void print_value_on(outputStream* st) const;
433
434 address unpack() const { return code_begin() + _unpack_offset; }
435 address unpack_with_exception() const { return code_begin() + _unpack_with_exception; }
436 address unpack_with_reexecution() const { return code_begin() + _unpack_with_reexecution; }
437
438 // Alternate entry point for C1 where the exception and issuing pc
439 // are in JavaThread::_exception_oop and JavaThread::_exception_pc
440 // instead of being in registers. This is needed because C1 doesn't
441 // model exception paths in a way that keeps these registers free so
442 // there may be live values in those registers during deopt.
443 void set_unpack_with_exception_in_tls_offset(int offset) {
444 _unpack_with_exception_in_tls = offset;
445 assert(code_contains(code_begin() + _unpack_with_exception_in_tls), "must be PC inside codeblob");
446 }
447 address unpack_with_exception_in_tls() const { return code_begin() + _unpack_with_exception_in_tls; }
448
449 #if INCLUDE_JVMCI
450 // Offsets when JVMCI calls uncommon_trap.
451 void set_uncommon_trap_offset(int offset) {
452 _uncommon_trap_offset = offset;
453 assert(contains(code_begin() + _uncommon_trap_offset), "must be PC inside codeblob");
454 }
455 address uncommon_trap() const { return code_begin() + _uncommon_trap_offset; }
456
457 void set_implicit_exception_uncommon_trap_offset(int offset) {
458 _implicit_exception_uncommon_trap_offset = offset;
459 assert(contains(code_begin() + _implicit_exception_uncommon_trap_offset), "must be PC inside codeblob");
460 }
461 address implicit_exception_uncommon_trap() const { return code_begin() + _implicit_exception_uncommon_trap_offset; }
462 #endif // INCLUDE_JVMCI
463 };
464
465
466 //----------------------------------------------------------------------------------------------------
467 // UncommonTrapBlob (currently only used by Compiler 2)
468
469 #ifdef COMPILER2
470
471 class UncommonTrapBlob: public SingletonBlob {
472 friend class VMStructs;
473 private:
474 // Creation support
475 UncommonTrapBlob(
476 CodeBuffer* cb,
477 int size,
478 OopMapSet* oop_maps,
479 int frame_size
480 );
481
482 public:
483 // Creation
484 static UncommonTrapBlob* create(
485 CodeBuffer* cb,
486 OopMapSet* oop_maps,
487 int frame_size
488 );
489
490 // GC for args
491 void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { /* nothing to do */ }
492
493 // Typing
494 bool is_uncommon_trap_stub() const { return true; }
495 };
496
497
498 //----------------------------------------------------------------------------------------------------
499 // ExceptionBlob: used for exception unwinding in compiled code (currently only used by Compiler 2)
500
501 class ExceptionBlob: public SingletonBlob {
502 friend class VMStructs;
503 private:
504 // Creation support
505 ExceptionBlob(
506 CodeBuffer* cb,
507 int size,
508 OopMapSet* oop_maps,
509 int frame_size
510 );
511
512 public:
513 // Creation
514 static ExceptionBlob* create(
515 CodeBuffer* cb,
516 OopMapSet* oop_maps,
517 int frame_size
518 );
519
520 // GC for args
521 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
522
523 // Typing
524 bool is_exception_stub() const { return true; }
525 };
526 #endif // COMPILER2
527
528
529 //----------------------------------------------------------------------------------------------------
530 // SafepointBlob: handles illegal_instruction exceptions during a safepoint
531
532 class SafepointBlob: public SingletonBlob {
533 friend class VMStructs;
534 private:
535 // Creation support
536 SafepointBlob(
537 CodeBuffer* cb,
538 int size,
539 OopMapSet* oop_maps,
540 int frame_size
541 );
542
543 public:
544 // Creation
545 static SafepointBlob* create(
546 CodeBuffer* cb,
547 OopMapSet* oop_maps,
548 int frame_size
549 );
550
551 // GC for args
552 void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, OopClosure* f) { /* nothing to do */ }
553
554 // Typing
555 bool is_safepoint_stub() const { return true; }
556 };
557
558 #endif // SHARE_VM_CODE_CODEBLOB_HPP