1 /*
2 * Copyright (c) 1997, 2022, 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_RUNTIME_FRAME_HPP
26 #define SHARE_RUNTIME_FRAME_HPP
27
28 #include "code/vmregTypes.hpp"
29 #include "compiler/oopMap.hpp"
30 #include "oops/oopsHierarchy.hpp"
31 #include "runtime/basicLock.hpp"
32 #include "runtime/monitorChunk.hpp"
33 #include "utilities/growableArray.hpp"
34 #include "utilities/macros.hpp"
35 #ifdef ZERO
36 # include "stack_zero.hpp"
37 #endif
38
39 typedef class BytecodeInterpreter* interpreterState;
40
41 class CodeBlob;
42 class CompiledMethod;
43 class FrameValues;
44 class InterpreterOopMap;
45 class JavaCallWrapper;
46 class Method;
47 class methodHandle;
48 class RegisterMap;
49 class vframeArray;
50
51 enum class DerivedPointerIterationMode {
52 _with_table,
53 _directly,
54 _ignore
55 };
56
57 // A frame represents a physical stack frame (an activation). Frames
58 // can be C or Java frames, and the Java frames can be interpreted or
59 // compiled. In contrast, vframes represent source-level activations,
60 // so that one physical frame can correspond to multiple source level
61 // frames because of inlining.
62
63 class frame {
64 private:
65 // Instance variables:
66 union {
67 intptr_t* _sp; // stack pointer (from Thread::last_Java_sp)
68 int _offset_sp; // used by frames in stack chunks
69 };
70 address _pc; // program counter (the next instruction after the call)
71 mutable CodeBlob* _cb; // CodeBlob that "owns" pc
72 mutable const ImmutableOopMap* _oop_map; // oop map, for compiled/stubs frames only
73 enum deopt_state {
74 not_deoptimized,
75 is_deoptimized,
76 unknown
77 };
78
79 deopt_state _deopt_state;
80
81 // Do internal pointers in interpreter frames use absolute adddresses or relative (to fp)?
82 // Frames in stack chunks are on the Java heap and use relative addressing; on the stack
83 // they use absolute addressing
84 bool _on_heap; // This frame represents a frame on the heap.
85 DEBUG_ONLY(int _frame_index;) // the frame index in a stack chunk; -1 when on a thread stack
86
87 // We use different assertions to allow for intermediate states (e.g. during thawing or relativizing the frame)
88 void assert_on_heap() const { assert(is_heap_frame(), "Using offset with a non-chunk frame"); }
89 void assert_offset() const { assert(_frame_index >= 0, "Using offset with a non-chunk frame"); assert_on_heap(); }
90 void assert_absolute() const { assert(_frame_index == -1, "Using absolute addresses with a chunk frame"); }
91
92 public:
93 // Constructors
94 frame();
95
96 explicit frame(bool dummy) {} // no initialization
97
98 explicit frame(intptr_t* sp);
99
100 #ifndef PRODUCT
101 // This is a generic constructor which is only used by pns() in debug.cpp.
102 // pns (i.e. print native stack) uses this constructor to create a starting
103 // frame for stack walking. The implementation of this constructor is platform
104 // dependent (i.e. SPARC doesn't need an 'fp' argument an will ignore it) but
105 // we want to keep the signature generic because pns() is shared code.
106 frame(void* sp, void* fp, void* pc);
107 #endif
108
109 // Accessors
110
111 // pc: Returns the pc at which this frame will continue normally.
112 // It must point at the beginning of the next instruction to execute.
113 address pc() const { return _pc; }
114
115 // This returns the pc that if you were in the debugger you'd see. Not
116 // the idealized value in the frame object. This undoes the magic conversion
117 // that happens for deoptimized frames. In addition it makes the value the
118 // hardware would want to see in the native frame. The only user (at this point)
119 // is deoptimization. It likely no one else should ever use it.
120 address raw_pc() const;
121
122 void set_pc(address newpc);
123
124 intptr_t* sp() const { assert_absolute(); return _sp; }
125 void set_sp( intptr_t* newsp ) { _sp = newsp; }
126
127 int offset_sp() const { assert_offset(); return _offset_sp; }
128 void set_offset_sp( int newsp ) { assert_on_heap(); _offset_sp = newsp; }
129
130 int frame_index() const {
131 #ifdef ASSERT
132 return _frame_index;
133 #else
134 return -1;
135 #endif
136 }
137 void set_frame_index( int index ) {
138 #ifdef ASSERT
139 _frame_index = index;
140 #endif
141 }
142
143 static int sender_sp_ret_address_offset();
144
145 CodeBlob* cb() const { return _cb; }
146 inline CodeBlob* get_cb() const;
147 // inline void set_cb(CodeBlob* cb);
148
149 const ImmutableOopMap* oop_map() const {
150 if (_oop_map == NULL) {
151 _oop_map = get_oop_map();
152 }
153 return _oop_map;
154 }
155
156 // patching operations
157 void patch_pc(Thread* thread, address pc);
158
159 // Every frame needs to return a unique id which distinguishes it from all other frames.
160 // For sparc and ia32 use sp. ia64 can have memory frames that are empty so multiple frames
161 // will have identical sp values. For ia64 the bsp (fp) value will serve. No real frame
162 // should have an id() of NULL so it is a distinguishing value for an unmatchable frame.
163 // We also have relationals which allow comparing a frame to anoth frame's id() allow
164 // us to distinguish younger (more recent activation) from older (less recent activations)
165 // A NULL id is only valid when comparing for equality.
166
167 intptr_t* id(void) const;
168 bool is_younger(intptr_t* id) const;
169 bool is_older(intptr_t* id) const;
170
171 // testers
172
173 // Compares for strict equality. Rarely used or needed.
174 // It can return a different result than f1.id() == f2.id()
175 bool equal(frame other) const;
176
177 // type testers
178 bool is_empty() const { return _pc == NULL; }
179 bool is_interpreted_frame() const;
180 bool is_java_frame() const;
181 bool is_entry_frame() const; // Java frame called from C?
182 bool is_stub_frame() const;
183 bool is_ignored_frame() const;
184 bool is_native_frame() const;
185 bool is_runtime_frame() const;
186 bool is_compiled_frame() const;
187 bool is_safepoint_blob_frame() const;
188 bool is_deoptimized_frame() const;
189 bool is_upcall_stub_frame() const;
190 bool is_heap_frame() const { return _on_heap; }
191
192 // testers
193 bool is_first_frame() const; // oldest frame? (has no sender)
194 bool is_first_java_frame() const; // same for Java frame
195 bool is_first_vthread_frame(JavaThread* thread) const;
196
197 bool is_interpreted_frame_valid(JavaThread* thread) const; // performs sanity checks on interpreted frames.
198
199 // is this frame doing a call using the compiled calling convention?
200 bool is_compiled_caller() const {
201 return is_compiled_frame() || is_upcall_stub_frame();
202 }
203
204 // tells whether this frame is marked for deoptimization
205 bool should_be_deoptimized() const;
206
207 // tells whether this frame can be deoptimized
208 bool can_be_deoptimized() const;
209
210 // the frame size in machine words
211 inline int frame_size() const;
212
213 // the size, in words, of stack-passed arguments
214 inline int compiled_frame_stack_argsize() const;
215
216 inline void interpreted_frame_oop_map(InterpreterOopMap* mask) const;
217
218 // returns the sending frame
219 inline frame sender(RegisterMap* map) const;
220
221 bool safe_for_sender(JavaThread *thread);
222
223 // returns the sender, but skips conversion frames
224 frame real_sender(RegisterMap* map) const;
225
226 // returns the sending Java frame, skipping any intermediate C frames
227 // NB: receiver must not be first frame
228 frame java_sender() const;
229
230 private:
231 // Helper methods for better factored code in frame::sender
232 inline frame sender_for_compiled_frame(RegisterMap* map) const;
233 frame sender_for_entry_frame(RegisterMap* map) const;
234 frame sender_for_interpreter_frame(RegisterMap* map) const;
235 frame sender_for_upcall_stub_frame(RegisterMap* map) const;
236
237 bool is_entry_frame_valid(JavaThread* thread) const;
238
239 // All frames:
240
241 // A low-level interface for vframes:
242
243 public:
244
245 intptr_t* addr_at(int index) const { return &fp()[index]; }
246 intptr_t at_absolute(int index) const { return *addr_at(index); }
247 // Interpreter frames in continuation stacks are on the heap, and internal addresses are relative to fp.
248 intptr_t at_relative(int index) const { return (intptr_t)(fp() + fp()[index]); }
249
250 intptr_t at(int index) const {
251 return _on_heap ? at_relative(index) : at_absolute(index);
252 }
253
254 public:
255 // Link (i.e., the pointer to the previous frame)
256 // might crash if the frame has no parent
257 intptr_t* link() const;
258
259 // Link (i.e., the pointer to the previous frame) or null if the link cannot be accessed
260 intptr_t* link_or_null() const;
261
262 // Return address
263 address sender_pc() const;
264
265 // Support for deoptimization
266 void deoptimize(JavaThread* thread);
267
268 // The frame's original SP, before any extension by an interpreted callee;
269 // used for packing debug info into vframeArray objects and vframeArray lookup.
270 intptr_t* unextended_sp() const;
271 void set_unextended_sp(intptr_t* value);
272
273 int offset_unextended_sp() const;
274 void set_offset_unextended_sp(int value);
275
276 // returns the stack pointer of the calling frame
277 intptr_t* sender_sp() const;
278
279 // Returns the real 'frame pointer' for the current frame.
280 // This is the value expected by the platform ABI when it defines a
281 // frame pointer register. It may differ from the effective value of
282 // the FP register when that register is used in the JVM for other
283 // purposes (like compiled frames on some platforms).
284 // On other platforms, it is defined so that the stack area used by
285 // this frame goes from real_fp() to sp().
286 intptr_t* real_fp() const;
287
288 // Deoptimization info, if needed (platform dependent).
289 // Stored in the initial_info field of the unroll info, to be used by
290 // the platform dependent deoptimization blobs.
291 intptr_t *initial_deoptimization_info();
292
293 // Interpreter frames:
294
295 private:
296 intptr_t** interpreter_frame_locals_addr() const;
297 intptr_t* interpreter_frame_bcp_addr() const;
298 intptr_t* interpreter_frame_mdp_addr() const;
299
300 public:
301 // Locals
302
303 // The _at version returns a pointer because the address is used for GC.
304 intptr_t* interpreter_frame_local_at(int index) const;
305
306 void interpreter_frame_set_locals(intptr_t* locs);
307
308 // byte code index
309 jint interpreter_frame_bci() const;
310
311 // byte code pointer
312 address interpreter_frame_bcp() const;
313 void interpreter_frame_set_bcp(address bcp);
314
315 // method data pointer
316 address interpreter_frame_mdp() const;
317 void interpreter_frame_set_mdp(address dp);
318
319 // Find receiver out of caller's (compiled) argument list
320 oop retrieve_receiver(RegisterMap *reg_map);
321
322 // Return the monitor owner and BasicLock for compiled synchronized
323 // native methods. Used by JVMTI's GetLocalInstance method
324 // (via VM_GetReceiver) to retrieve the receiver from a native wrapper frame.
325 BasicLock* get_native_monitor();
326 oop get_native_receiver();
327
328 // Find receiver for an invoke when arguments are just pushed on stack (i.e., callee stack-frame is
329 // not setup)
330 oop interpreter_callee_receiver(Symbol* signature);
331
332
333 oop* interpreter_callee_receiver_addr(Symbol* signature);
334
335
336 // expression stack (may go up or down, direction == 1 or -1)
337 public:
338 intptr_t* interpreter_frame_expression_stack() const;
339
340 // The _at version returns a pointer because the address is used for GC.
341 intptr_t* interpreter_frame_expression_stack_at(jint offset) const;
342
343 // top of expression stack
344 intptr_t* interpreter_frame_tos_at(jint offset) const;
345 intptr_t* interpreter_frame_tos_address() const;
346
347
348 jint interpreter_frame_expression_stack_size() const;
349
350 intptr_t* interpreter_frame_sender_sp() const;
351
352 // template based interpreter deoptimization support
353 void set_interpreter_frame_sender_sp(intptr_t* sender_sp);
354 void interpreter_frame_set_monitor_end(BasicObjectLock* value);
355
356 // Address of the temp oop in the frame. Needed as GC root.
357 oop* interpreter_frame_temp_oop_addr() const;
358
359 // BasicObjectLocks:
360 //
361 // interpreter_frame_monitor_begin is higher in memory than interpreter_frame_monitor_end
362 // Interpreter_frame_monitor_begin points to one element beyond the oldest one,
363 // interpreter_frame_monitor_end points to the youngest one, or if there are none,
364 // it points to one beyond where the first element will be.
365 // interpreter_frame_monitor_size reports the allocation size of a monitor in the interpreter stack.
366 // this value is >= BasicObjectLock::size(), and may be rounded up
367
368 BasicObjectLock* interpreter_frame_monitor_begin() const;
369 BasicObjectLock* interpreter_frame_monitor_end() const;
370 BasicObjectLock* next_monitor_in_interpreter_frame(BasicObjectLock* current) const;
371 BasicObjectLock* previous_monitor_in_interpreter_frame(BasicObjectLock* current) const;
372 static int interpreter_frame_monitor_size();
373
374 void interpreter_frame_verify_monitor(BasicObjectLock* value) const;
375
376 // Return/result value from this interpreter frame
377 // If the method return type is T_OBJECT or T_ARRAY populates oop_result
378 // For other (non-T_VOID) the appropriate field in the jvalue is populated
379 // with the result value.
380 // Should only be called when at method exit when the method is not
381 // exiting due to an exception.
382 BasicType interpreter_frame_result(oop* oop_result, jvalue* value_result);
383
384 public:
385 // Method & constant pool cache
386 Method* interpreter_frame_method() const;
387 void interpreter_frame_set_method(Method* method);
388 Method** interpreter_frame_method_addr() const;
389 ConstantPoolCache** interpreter_frame_cache_addr() const;
390 oop* interpreter_frame_mirror_addr() const;
391
392 void interpreter_frame_set_mirror(oop mirror);
393
394 public:
395 // Entry frames
396 JavaCallWrapper* entry_frame_call_wrapper() const { return *entry_frame_call_wrapper_addr(); }
397 JavaCallWrapper* entry_frame_call_wrapper_if_safe(JavaThread* thread) const;
398 JavaCallWrapper** entry_frame_call_wrapper_addr() const;
399 intptr_t* entry_frame_argument_at(int offset) const;
400
401 // tells whether there is another chunk of Delta stack above
402 bool entry_frame_is_first() const;
403 bool upcall_stub_frame_is_first() const;
404
405 // Safepoints
406
407 public:
408 oop saved_oop_result(RegisterMap* map) const;
409 void set_saved_oop_result(RegisterMap* map, oop obj);
410
411 // For debugging
412 private:
413 const char* print_name() const;
414
415 void describe_pd(FrameValues& values, int frame_no);
416
417 public:
418 void print_value() const { print_value_on(tty,NULL); }
419 void print_value_on(outputStream* st, JavaThread *thread) const;
420 void print_on(outputStream* st) const;
421 void interpreter_frame_print_on(outputStream* st) const;
422 void print_on_error(outputStream* st, char* buf, int buflen, bool verbose = false) const;
423 static void print_C_frame(outputStream* st, char* buf, int buflen, address pc);
424
425 // Add annotated descriptions of memory locations belonging to this frame to values
426 void describe(FrameValues& values, int frame_no, const RegisterMap* reg_map=NULL);
427
428 // Conversion from a VMReg to physical stack location
429 template <typename RegisterMapT>
430 address oopmapreg_to_location(VMReg reg, const RegisterMapT* reg_map) const;
431 template <typename RegisterMapT>
432 oop* oopmapreg_to_oop_location(VMReg reg, const RegisterMapT* reg_map) const;
433
434 // Oops-do's
435 void oops_compiled_arguments_do(Symbol* signature, bool has_receiver, bool has_appendix, const RegisterMap* reg_map, OopClosure* f) const;
436 void oops_interpreted_do(OopClosure* f, const RegisterMap* map, bool query_oop_map_cache = true) const;
437 void buffered_values_interpreted_do(BufferedValueClosure* f);
438
439 private:
440 void oops_interpreted_arguments_do(Symbol* signature, bool has_receiver, OopClosure* f) const;
441
442 // Iteration of oops
443 void oops_do_internal(OopClosure* f, CodeBlobClosure* cf,
444 DerivedOopClosure* df, DerivedPointerIterationMode derived_mode,
445 const RegisterMap* map, bool use_interpreter_oop_map_cache) const;
446
447 void oops_entry_do(OopClosure* f, const RegisterMap* map) const;
448 void oops_code_blob_do(OopClosure* f, CodeBlobClosure* cf,
449 DerivedOopClosure* df, DerivedPointerIterationMode derived_mode,
450 const RegisterMap* map) const;
451 public:
452 // Memory management
453 void oops_do(OopClosure* f, CodeBlobClosure* cf, const RegisterMap* map) {
454 #if COMPILER2_OR_JVMCI
455 DerivedPointerIterationMode dpim = DerivedPointerTable::is_active() ?
456 DerivedPointerIterationMode::_with_table :
457 DerivedPointerIterationMode::_ignore;
458 #else
459 DerivedPointerIterationMode dpim = DerivedPointerIterationMode::_ignore;;
460 #endif
461 oops_do_internal(f, cf, NULL, dpim, map, true);
462 }
463
464 void oops_do(OopClosure* f, CodeBlobClosure* cf, DerivedOopClosure* df, const RegisterMap* map) {
465 oops_do_internal(f, cf, df, DerivedPointerIterationMode::_ignore, map, true);
466 }
467
468 void oops_do(OopClosure* f, CodeBlobClosure* cf, const RegisterMap* map,
469 DerivedPointerIterationMode derived_mode) const {
470 oops_do_internal(f, cf, NULL, derived_mode, map, true);
471 }
472
473 void nmethods_do(CodeBlobClosure* cf) const;
474
475 // RedefineClasses support for finding live interpreted methods on the stack
476 void metadata_do(MetadataClosure* f) const;
477
478 // Verification
479 void verify(const RegisterMap* map) const;
480 static bool verify_return_pc(address x);
481 // Usage:
482 // assert(frame::verify_return_pc(return_address), "must be a return pc");
483
484 #include CPU_HEADER(frame)
485
486 };
487
488 #ifndef PRODUCT
489 // A simple class to describe a location on the stack
490 class FrameValue {
491 public:
492 intptr_t* location;
493 char* description;
494 int owner;
495 int priority;
496
497 FrameValue() {
498 location = NULL;
499 description = NULL;
500 owner = -1;
501 priority = 0;
502 }
503 };
504
505
506 // A collection of described stack values that can print a symbolic
507 // description of the stack memory. Interpreter frame values can be
508 // in the caller frames so all the values are collected first and then
509 // sorted before being printed.
510 class FrameValues {
511 private:
512 GrowableArray<FrameValue> _values;
513
514 static int compare(FrameValue* a, FrameValue* b) {
515 if (a->location == b->location) {
516 return a->priority - b->priority;
517 }
518 return a->location - b->location;
519 }
520
521 void print_on(outputStream* out, int min_index, int max_index, intptr_t* v0, intptr_t* v1,
522 bool on_heap = false);
523
524 public:
525 // Used by frame functions to describe locations.
526 void describe(int owner, intptr_t* location, const char* description, int priority = 0);
527
528 #ifdef ASSERT
529 void validate();
530 #endif
531 void print(JavaThread* thread) { print_on(thread, tty); }
532 void print_on(JavaThread* thread, outputStream* out);
533 void print(stackChunkOop chunk) { print_on(chunk, tty); }
534 void print_on(stackChunkOop chunk, outputStream* out);
535 };
536
537 #endif
538
539
540 #endif // SHARE_RUNTIME_FRAME_HPP