1 /*
2 * Copyright (c) 1997, 2011, 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_RUNTIME_FRAME_HPP
26 #define SHARE_VM_RUNTIME_FRAME_HPP
27
28 #include "asm/assembler.hpp"
29 #include "oops/methodOop.hpp"
30 #include "runtime/basicLock.hpp"
31 #include "runtime/monitorChunk.hpp"
32 #include "runtime/registerMap.hpp"
33 #include "utilities/top.hpp"
34 #ifdef COMPILER2
35 #ifdef TARGET_ARCH_MODEL_x86_32
36 # include "adfiles/adGlobals_x86_32.hpp"
37 #endif
38 #ifdef TARGET_ARCH_MODEL_x86_64
39 # include "adfiles/adGlobals_x86_64.hpp"
40 #endif
41 #ifdef TARGET_ARCH_MODEL_sparc
42 # include "adfiles/adGlobals_sparc.hpp"
43 #endif
44 #ifdef TARGET_ARCH_MODEL_zero
45 # include "adfiles/adGlobals_zero.hpp"
46 #endif
47 #ifdef TARGET_ARCH_MODEL_arm
48 # include "adfiles/adGlobals_arm.hpp"
49 #endif
50 #ifdef TARGET_ARCH_MODEL_ppc
51 # include "adfiles/adGlobals_ppc.hpp"
52 #endif
53 #endif
54 #ifdef ZERO
55 #ifdef TARGET_ARCH_zero
56 # include "stack_zero.hpp"
57 #endif
58 #endif
59
60 typedef class BytecodeInterpreter* interpreterState;
61
62 class CodeBlob;
63 class FrameValues;
64 class vframeArray;
65
66
67 // A frame represents a physical stack frame (an activation). Frames
68 // can be C or Java frames, and the Java frames can be interpreted or
69 // compiled. In contrast, vframes represent source-level activations,
70 // so that one physical frame can correspond to multiple source level
71 // frames because of inlining.
72
73 class frame VALUE_OBJ_CLASS_SPEC {
74 private:
75 // Instance variables:
76 intptr_t* _sp; // stack pointer (from Thread::last_Java_sp)
77 address _pc; // program counter (the next instruction after the call)
78
79 CodeBlob* _cb; // CodeBlob that "owns" pc
80 enum deopt_state {
81 not_deoptimized,
82 is_deoptimized,
83 unknown
84 };
85
86 deopt_state _deopt_state;
87
88 public:
89 // Constructors
90 frame();
91
92 // Accessors
93
94 // pc: Returns the pc at which this frame will continue normally.
95 // It must point at the beginning of the next instruction to execute.
96 address pc() const { return _pc; }
97
98 // This returns the pc that if you were in the debugger you'd see. Not
99 // the idealized value in the frame object. This undoes the magic conversion
100 // that happens for deoptimized frames. In addition it makes the value the
101 // hardware would want to see in the native frame. The only user (at this point)
102 // is deoptimization. It likely no one else should ever use it.
103 address raw_pc() const;
104
105 void set_pc( address newpc );
106
107 intptr_t* sp() const { return _sp; }
108 void set_sp( intptr_t* newsp ) { _sp = newsp; }
109
110
111 CodeBlob* cb() const { return _cb; }
112
113 // patching operations
114 void patch_pc(Thread* thread, address pc);
115
116 // Every frame needs to return a unique id which distinguishes it from all other frames.
117 // For sparc and ia32 use sp. ia64 can have memory frames that are empty so multiple frames
118 // will have identical sp values. For ia64 the bsp (fp) value will serve. No real frame
119 // should have an id() of NULL so it is a distinguishing value for an unmatchable frame.
120 // We also have relationals which allow comparing a frame to anoth frame's id() allow
121 // us to distinguish younger (more recent activation) from older (less recent activations)
122 // A NULL id is only valid when comparing for equality.
123
124 intptr_t* id(void) const;
125 bool is_younger(intptr_t* id) const;
126 bool is_older(intptr_t* id) const;
127
128 // testers
129
130 // Compares for strict equality. Rarely used or needed.
131 // It can return a different result than f1.id() == f2.id()
132 bool equal(frame other) const;
133
134 // type testers
135 bool is_interpreted_frame() const;
136 bool is_java_frame() const;
137 bool is_entry_frame() const; // Java frame called from C?
138 bool is_ricochet_frame() const;
139 bool is_native_frame() const;
140 bool is_runtime_frame() const;
141 bool is_compiled_frame() const;
142 bool is_safepoint_blob_frame() const;
143 bool is_deoptimized_frame() const;
144
145 // testers
146 bool is_first_frame() const; // oldest frame? (has no sender)
147 bool is_first_java_frame() const; // same for Java frame
148
149 bool is_interpreted_frame_valid(JavaThread* thread) const; // performs sanity checks on interpreted frames.
150
151 // tells whether this frame is marked for deoptimization
152 bool should_be_deoptimized() const;
153
154 // tells whether this frame can be deoptimized
155 bool can_be_deoptimized() const;
156
157 // returns the frame size in stack slots
158 int frame_size(RegisterMap* map) const;
159
160 // returns the sending frame
161 frame sender(RegisterMap* map) const;
162
163 // for Profiling - acting on another frame. walks sender frames
164 // if valid.
165 frame profile_find_Java_sender_frame(JavaThread *thread);
166 bool safe_for_sender(JavaThread *thread);
167
168 // returns the sender, but skips conversion frames
169 frame real_sender(RegisterMap* map) const;
170
171 // returns the the sending Java frame, skipping any intermediate C frames
172 // NB: receiver must not be first frame
173 frame java_sender() const;
174
175 private:
176 // Helper methods for better factored code in frame::sender
177 frame sender_for_compiled_frame(RegisterMap* map) const;
178 frame sender_for_entry_frame(RegisterMap* map) const;
179 frame sender_for_ricochet_frame(RegisterMap* map) const;
180 frame sender_for_interpreter_frame(RegisterMap* map) const;
181 frame sender_for_native_frame(RegisterMap* map) const;
182
183 // All frames:
184
185 // A low-level interface for vframes:
186
187 public:
188
189 intptr_t* addr_at(int index) const { return &fp()[index]; }
190 intptr_t at(int index) const { return *addr_at(index); }
191
192 // accessors for locals
193 oop obj_at(int offset) const { return *obj_at_addr(offset); }
194 void obj_at_put(int offset, oop value) { *obj_at_addr(offset) = value; }
195
196 jint int_at(int offset) const { return *int_at_addr(offset); }
197 void int_at_put(int offset, jint value) { *int_at_addr(offset) = value; }
198
199 oop* obj_at_addr(int offset) const { return (oop*) addr_at(offset); }
200
201 oop* adjusted_obj_at_addr(methodOop method, int index) { return obj_at_addr(adjust_offset(method, index)); }
202
203 private:
204 jint* int_at_addr(int offset) const { return (jint*) addr_at(offset); }
205
206 public:
207 // Link (i.e., the pointer to the previous frame)
208 intptr_t* link() const;
209 void set_link(intptr_t* addr);
210
211 // Return address
212 address sender_pc() const;
213
214 // Support for deoptimization
215 void deoptimize(JavaThread* thread);
216
217 // The frame's original SP, before any extension by an interpreted callee;
218 // used for packing debug info into vframeArray objects and vframeArray lookup.
219 intptr_t* unextended_sp() const;
220
221 // returns the stack pointer of the calling frame
222 intptr_t* sender_sp() const;
223
224 // Deoptimization info, if needed (platform dependent).
225 // Stored in the initial_fp field of the unroll info, to be used by
226 // the platform dependent deoptimization blobs.
227 intptr_t *initial_deoptimization_info();
228
229 // Interpreter frames:
230
231 private:
232 intptr_t** interpreter_frame_locals_addr() const;
233 intptr_t* interpreter_frame_bcx_addr() const;
234 intptr_t* interpreter_frame_mdx_addr() const;
235
236 public:
237 // Locals
238
239 // The _at version returns a pointer because the address is used for GC.
240 intptr_t* interpreter_frame_local_at(int index) const;
241
242 void interpreter_frame_set_locals(intptr_t* locs);
243
244 // byte code index/pointer (use these functions for unchecked frame access only!)
245 intptr_t interpreter_frame_bcx() const { return *interpreter_frame_bcx_addr(); }
246 void interpreter_frame_set_bcx(intptr_t bcx);
247
248 // byte code index
249 jint interpreter_frame_bci() const;
250 void interpreter_frame_set_bci(jint bci);
251
252 // byte code pointer
253 address interpreter_frame_bcp() const;
254 void interpreter_frame_set_bcp(address bcp);
255
256 // Unchecked access to the method data index/pointer.
257 // Only use this if you know what you are doing.
258 intptr_t interpreter_frame_mdx() const { return *interpreter_frame_mdx_addr(); }
259 void interpreter_frame_set_mdx(intptr_t mdx);
260
261 // method data pointer
262 address interpreter_frame_mdp() const;
263 void interpreter_frame_set_mdp(address dp);
264
265 // Find receiver out of caller's (compiled) argument list
266 oop retrieve_receiver(RegisterMap *reg_map);
267
268 // Return the monitor owner and BasicLock for compiled synchronized
269 // native methods so that biased locking can revoke the receiver's
270 // bias if necessary. This is also used by JVMTI's GetLocalInstance method
271 // (via VM_GetReceiver) to retrieve the receiver from a native wrapper frame.
272 BasicLock* get_native_monitor();
273 oop get_native_receiver();
274
275 // Find receiver for an invoke when arguments are just pushed on stack (i.e., callee stack-frame is
276 // not setup)
277 oop interpreter_callee_receiver(Symbol* signature) { return *interpreter_callee_receiver_addr(signature); }
278
279
280 oop* interpreter_callee_receiver_addr(Symbol* signature);
281
282
283 // expression stack (may go up or down, direction == 1 or -1)
284 public:
285 intptr_t* interpreter_frame_expression_stack() const;
286 static jint interpreter_frame_expression_stack_direction();
287
288 // The _at version returns a pointer because the address is used for GC.
289 intptr_t* interpreter_frame_expression_stack_at(jint offset) const;
290
291 // top of expression stack
292 intptr_t* interpreter_frame_tos_at(jint offset) const;
293 intptr_t* interpreter_frame_tos_address() const;
294
295
296 jint interpreter_frame_expression_stack_size() const;
297
298 intptr_t* interpreter_frame_sender_sp() const;
299
300 #ifndef CC_INTERP
301 // template based interpreter deoptimization support
302 void set_interpreter_frame_sender_sp(intptr_t* sender_sp);
303 void interpreter_frame_set_monitor_end(BasicObjectLock* value);
304 #endif // CC_INTERP
305
306 // BasicObjectLocks:
307 //
308 // interpreter_frame_monitor_begin is higher in memory than interpreter_frame_monitor_end
309 // Interpreter_frame_monitor_begin points to one element beyond the oldest one,
310 // interpreter_frame_monitor_end points to the youngest one, or if there are none,
311 // it points to one beyond where the first element will be.
312 // interpreter_frame_monitor_size reports the allocation size of a monitor in the interpreter stack.
313 // this value is >= BasicObjectLock::size(), and may be rounded up
314
315 BasicObjectLock* interpreter_frame_monitor_begin() const;
316 BasicObjectLock* interpreter_frame_monitor_end() const;
317 BasicObjectLock* next_monitor_in_interpreter_frame(BasicObjectLock* current) const;
318 BasicObjectLock* previous_monitor_in_interpreter_frame(BasicObjectLock* current) const;
319 static int interpreter_frame_monitor_size();
320
321 void interpreter_frame_verify_monitor(BasicObjectLock* value) const;
322
323 // Tells whether the current interpreter_frame frame pointer
324 // corresponds to the old compiled/deoptimized fp
325 // The receiver used to be a top level frame
326 bool interpreter_frame_equals_unpacked_fp(intptr_t* fp);
327
328 // Return/result value from this interpreter frame
329 // If the method return type is T_OBJECT or T_ARRAY populates oop_result
330 // For other (non-T_VOID) the appropriate field in the jvalue is populated
331 // with the result value.
332 // Should only be called when at method exit when the method is not
333 // exiting due to an exception.
334 BasicType interpreter_frame_result(oop* oop_result, jvalue* value_result);
335
336 public:
337 // Method & constant pool cache
338 methodOop interpreter_frame_method() const;
339 void interpreter_frame_set_method(methodOop method);
340 methodOop* interpreter_frame_method_addr() const;
341 constantPoolCacheOop* interpreter_frame_cache_addr() const;
342 #ifdef PPC
343 oop* interpreter_frame_mirror_addr() const;
344 #endif
345
346 public:
347 // Entry frames
348 JavaCallWrapper* entry_frame_call_wrapper() const;
349 intptr_t* entry_frame_argument_at(int offset) const;
350
351 // tells whether there is another chunk of Delta stack above
352 bool entry_frame_is_first() const;
353
354 // Compiled frames:
355
356 public:
357 // Given the index of a local, and the number of argument words
358 // in this stack frame, tell which word of the stack frame to find
359 // the local in. Arguments are stored above the ofp/rpc pair,
360 // while other locals are stored below it.
361 // Since monitors (BasicLock blocks) are also assigned indexes,
362 // but may have different storage requirements, their presence
363 // can also affect the calculation of offsets.
364 static int local_offset_for_compiler(int local_index, int nof_args, int max_nof_locals, int max_nof_monitors);
365
366 // Given the index of a monitor, etc., tell which word of the
367 // stack frame contains the start of the BasicLock block.
368 // Note that the local index by convention is the __higher__
369 // of the two indexes allocated to the block.
370 static int monitor_offset_for_compiler(int local_index, int nof_args, int max_nof_locals, int max_nof_monitors);
371
372 // Tell the smallest value that local_offset_for_compiler will attain.
373 // This is used to help determine how much stack frame to allocate.
374 static int min_local_offset_for_compiler(int nof_args, int max_nof_locals, int max_nof_monitors);
375
376 // Tells if this register must be spilled during a call.
377 // On Intel, all registers are smashed by calls.
378 static bool volatile_across_calls(Register reg);
379
380
381 // Safepoints
382
383 public:
384 oop saved_oop_result(RegisterMap* map) const;
385 void set_saved_oop_result(RegisterMap* map, oop obj);
386
387 // For debugging
388 private:
389 const char* print_name() const;
390
391 void describe_pd(FrameValues& values, int frame_no);
392
393 public:
394 void print_value() const { print_value_on(tty,NULL); }
395 void print_value_on(outputStream* st, JavaThread *thread) const;
396 void print_on(outputStream* st) const;
397 void interpreter_frame_print_on(outputStream* st) const;
398 void print_on_error(outputStream* st, char* buf, int buflen, bool verbose = false) const;
399
400 // Add annotated descriptions of memory locations belonging to this frame to values
401 void describe(FrameValues& values, int frame_no);
402
403 // Conversion from an VMReg to physical stack location
404 oop* oopmapreg_to_location(VMReg reg, const RegisterMap* regmap) const;
405
406 // Oops-do's
407 void oops_compiled_arguments_do(Symbol* signature, bool has_receiver, const RegisterMap* reg_map, OopClosure* f);
408 void oops_interpreted_do(OopClosure* f, const RegisterMap* map, bool query_oop_map_cache = true);
409 void oops_ricochet_do(OopClosure* f, const RegisterMap* map);
410
411 private:
412 void oops_interpreted_arguments_do(Symbol* signature, bool has_receiver, OopClosure* f);
413
414 // Iteration of oops
415 void oops_do_internal(OopClosure* f, CodeBlobClosure* cf, RegisterMap* map, bool use_interpreter_oop_map_cache);
416 void oops_entry_do(OopClosure* f, const RegisterMap* map);
417 void oops_code_blob_do(OopClosure* f, CodeBlobClosure* cf, const RegisterMap* map);
418 int adjust_offset(methodOop method, int index); // helper for above fn
419 public:
420 // Memory management
421 void oops_do(OopClosure* f, CodeBlobClosure* cf, RegisterMap* map) { oops_do_internal(f, cf, map, true); }
422 void nmethods_do(CodeBlobClosure* cf);
423
424 void gc_prologue();
425 void gc_epilogue();
426 void pd_gc_epilog();
427
428 # ifdef ENABLE_ZAP_DEAD_LOCALS
429 private:
430 class CheckValueClosure: public OopClosure {
431 public:
432 void do_oop(oop* p);
433 void do_oop(narrowOop* p) { ShouldNotReachHere(); }
434 };
435 static CheckValueClosure _check_value;
436
437 class CheckOopClosure: public OopClosure {
438 public:
439 void do_oop(oop* p);
440 void do_oop(narrowOop* p) { ShouldNotReachHere(); }
441 };
442 static CheckOopClosure _check_oop;
443
444 static void check_derived_oop(oop* base, oop* derived);
445
446 class ZapDeadClosure: public OopClosure {
447 public:
448 void do_oop(oop* p);
449 void do_oop(narrowOop* p) { ShouldNotReachHere(); }
450 };
451 static ZapDeadClosure _zap_dead;
452
453 public:
454 // Zapping
455 void zap_dead_locals (JavaThread* thread, const RegisterMap* map);
456 void zap_dead_interpreted_locals(JavaThread* thread, const RegisterMap* map);
457 void zap_dead_compiled_locals (JavaThread* thread, const RegisterMap* map);
458 void zap_dead_entry_locals (JavaThread* thread, const RegisterMap* map);
459 void zap_dead_deoptimized_locals(JavaThread* thread, const RegisterMap* map);
460 # endif
461 // Verification
462 void verify(const RegisterMap* map);
463 static bool verify_return_pc(address x);
464 static bool is_bci(intptr_t bcx);
465 // Usage:
466 // assert(frame::verify_return_pc(return_address), "must be a return pc");
467
468 int pd_oop_map_offset_adjustment() const;
469
470 #ifdef TARGET_ARCH_x86
471 # include "frame_x86.hpp"
472 #endif
473 #ifdef TARGET_ARCH_sparc
474 # include "frame_sparc.hpp"
475 #endif
476 #ifdef TARGET_ARCH_zero
477 # include "frame_zero.hpp"
478 #endif
479 #ifdef TARGET_ARCH_arm
480 # include "frame_arm.hpp"
481 #endif
482 #ifdef TARGET_ARCH_ppc
483 # include "frame_ppc.hpp"
484 #endif
485
486 };
487
488 #ifdef ASSERT
489 // A simple class to describe a location on the stack
490 class FrameValue VALUE_OBJ_CLASS_SPEC {
491 public:
492 intptr_t* location;
493 char* description;
494 int owner;
495 int priority;
496 };
497
498
499 // A collection of described stack values that can print a symbolic
500 // description of the stack memory. Interpreter frame values can be
501 // in the caller frames so all the values are collected first and then
502 // sorted before being printed.
503 class FrameValues {
504 private:
505 GrowableArray<FrameValue> _values;
506
507 static int compare(FrameValue* a, FrameValue* b) {
508 if (a->location == b->location) {
509 return a->priority - b->priority;
510 }
511 return a->location - b->location;
512 }
513
514 public:
515 // Used by frame functions to describe locations.
516 void describe(int owner, intptr_t* location, const char* description, int priority = 0);
517
518 void validate();
519 void print();
520 };
521
522 #endif
523
524 //
525 // StackFrameStream iterates through the frames of a thread starting from
526 // top most frame. It automatically takes care of updating the location of
527 // all (callee-saved) registers. Notice: If a thread is stopped at
528 // a safepoint, all registers are saved, not only the callee-saved ones.
529 //
530 // Use:
531 //
532 // for(StackFrameStream fst(thread); !fst.is_done(); fst.next()) {
533 // ...
534 // }
535 //
536 class StackFrameStream : public StackObj {
537 private:
538 frame _fr;
539 RegisterMap _reg_map;
540 bool _is_done;
541 public:
542 StackFrameStream(JavaThread *thread, bool update = true);
543
544 // Iteration
545 bool is_done() { return (_is_done) ? true : (_is_done = _fr.is_first_frame(), false); }
546 void next() { if (!_is_done) _fr = _fr.sender(&_reg_map); }
547
548 // Query
549 frame *current() { return &_fr; }
550 RegisterMap* register_map() { return &_reg_map; }
551 };
552
553 #endif // SHARE_VM_RUNTIME_FRAME_HPP