Fri, 29 Jan 2010 12:13:05 +0100
6917766: JSR 292 needs its own deopt handler
Summary: We need to introduce a new MH deopt handler so we can easily determine if the deopt happened at a MH call site or not.
Reviewed-by: never, jrose
1 /*
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23 */
25 typedef class BytecodeInterpreter* interpreterState;
27 class CodeBlob;
30 // A frame represents a physical stack frame (an activation). Frames
31 // can be C or Java frames, and the Java frames can be interpreted or
32 // compiled. In contrast, vframes represent source-level activations,
33 // so that one physical frame can correspond to multiple source level
34 // frames because of inlining.
36 class frame VALUE_OBJ_CLASS_SPEC {
37 private:
38 // Instance variables:
39 intptr_t* _sp; // stack pointer (from Thread::last_Java_sp)
40 address _pc; // program counter (the next instruction after the call)
42 CodeBlob* _cb; // CodeBlob that "owns" pc
43 enum deopt_state {
44 not_deoptimized,
45 is_deoptimized,
46 unknown
47 };
49 deopt_state _deopt_state;
51 public:
52 // Constructors
53 frame();
55 // Accessors
57 // pc: Returns the pc at which this frame will continue normally.
58 // It must point at the beginning of the next instruction to execute.
59 address pc() const { return _pc; }
61 // This returns the pc that if you were in the debugger you'd see. Not
62 // the idealized value in the frame object. This undoes the magic conversion
63 // that happens for deoptimized frames. In addition it makes the value the
64 // hardware would want to see in the native frame. The only user (at this point)
65 // is deoptimization. It likely no one else should ever use it.
66 address raw_pc() const;
68 void set_pc( address newpc );
70 intptr_t* sp() const { return _sp; }
71 void set_sp( intptr_t* newsp ) { _sp = newsp; }
74 CodeBlob* cb() const { return _cb; }
76 // patching operations
77 void patch_pc(Thread* thread, address pc);
79 // Every frame needs to return a unique id which distinguishes it from all other frames.
80 // For sparc and ia32 use sp. ia64 can have memory frames that are empty so multiple frames
81 // will have identical sp values. For ia64 the bsp (fp) value will serve. No real frame
82 // should have an id() of NULL so it is a distinguishing value for an unmatchable frame.
83 // We also have relationals which allow comparing a frame to anoth frame's id() allow
84 // us to distinguish younger (more recent activation) from older (less recent activations)
85 // A NULL id is only valid when comparing for equality.
87 intptr_t* id(void) const;
88 bool is_younger(intptr_t* id) const;
89 bool is_older(intptr_t* id) const;
91 // testers
93 // Compares for strict equality. Rarely used or needed.
94 // It can return a different result than f1.id() == f2.id()
95 bool equal(frame other) const;
97 // type testers
98 bool is_interpreted_frame() const;
99 bool is_java_frame() const;
100 bool is_entry_frame() const; // Java frame called from C?
101 bool is_native_frame() const;
102 bool is_runtime_frame() const;
103 bool is_compiled_frame() const;
104 bool is_safepoint_blob_frame() const;
105 bool is_deoptimized_frame() const;
107 // testers
108 bool is_first_frame() const; // oldest frame? (has no sender)
109 bool is_first_java_frame() const; // same for Java frame
111 bool is_interpreted_frame_valid(JavaThread* thread) const; // performs sanity checks on interpreted frames.
113 // tells whether this frame is marked for deoptimization
114 bool should_be_deoptimized() const;
116 // tells whether this frame can be deoptimized
117 bool can_be_deoptimized() const;
119 // returns the frame size in stack slots
120 int frame_size(RegisterMap* map) const;
122 // returns the sending frame
123 frame sender(RegisterMap* map) const;
125 // for Profiling - acting on another frame. walks sender frames
126 // if valid.
127 frame profile_find_Java_sender_frame(JavaThread *thread);
128 bool safe_for_sender(JavaThread *thread);
130 // returns the sender, but skips conversion frames
131 frame real_sender(RegisterMap* map) const;
133 // returns the the sending Java frame, skipping any intermediate C frames
134 // NB: receiver must not be first frame
135 frame java_sender() const;
137 private:
138 // Helper methods for better factored code in frame::sender
139 frame sender_for_compiled_frame(RegisterMap* map) const;
140 frame sender_for_entry_frame(RegisterMap* map) const;
141 frame sender_for_interpreter_frame(RegisterMap* map) const;
142 frame sender_for_native_frame(RegisterMap* map) const;
144 #if ASSERT
145 // Used in frame::sender_for_{interpreter,compiled}_frame
146 static void verify_deopt_original_pc( nmethod* nm, intptr_t* unextended_sp, bool is_method_handle_return = false);
147 static void verify_deopt_mh_original_pc(nmethod* nm, intptr_t* unextended_sp) {
148 verify_deopt_original_pc(nm, unextended_sp, true);
149 }
150 #endif
152 // All frames:
154 // A low-level interface for vframes:
156 public:
158 intptr_t* addr_at(int index) const { return &fp()[index]; }
159 intptr_t at(int index) const { return *addr_at(index); }
161 // accessors for locals
162 oop obj_at(int offset) const { return *obj_at_addr(offset); }
163 void obj_at_put(int offset, oop value) { *obj_at_addr(offset) = value; }
165 jint int_at(int offset) const { return *int_at_addr(offset); }
166 void int_at_put(int offset, jint value) { *int_at_addr(offset) = value; }
168 oop* obj_at_addr(int offset) const { return (oop*) addr_at(offset); }
170 oop* adjusted_obj_at_addr(methodOop method, int index) { return obj_at_addr(adjust_offset(method, index)); }
172 private:
173 jint* int_at_addr(int offset) const { return (jint*) addr_at(offset); }
175 public:
176 // Link (i.e., the pointer to the previous frame)
177 intptr_t* link() const;
178 void set_link(intptr_t* addr);
180 // Return address
181 address sender_pc() const;
183 // Support for deoptimization
184 void deoptimize(JavaThread* thread, bool thread_is_known_safe = false);
186 // The frame's original SP, before any extension by an interpreted callee;
187 // used for packing debug info into vframeArray objects and vframeArray lookup.
188 intptr_t* unextended_sp() const;
190 // returns the stack pointer of the calling frame
191 intptr_t* sender_sp() const;
194 // Interpreter frames:
196 private:
197 intptr_t** interpreter_frame_locals_addr() const;
198 intptr_t* interpreter_frame_bcx_addr() const;
199 intptr_t* interpreter_frame_mdx_addr() const;
201 public:
202 // Tags for TaggedStackInterpreter
203 enum Tag {
204 TagValue = 0, // Important: must be zero to use G0 on sparc.
205 TagReference = 0x555, // Reference type - is an oop that needs gc.
206 TagCategory2 = 0x666 // Only used internally by interpreter
207 // and not written to the java stack.
208 // The values above are chosen so that misuse causes a crash
209 // with a recognizable value.
210 };
212 static Tag tag_for_basic_type(BasicType typ) {
213 return (typ == T_OBJECT ? TagReference : TagValue);
214 }
216 // Locals
218 // The _at version returns a pointer because the address is used for GC.
219 intptr_t* interpreter_frame_local_at(int index) const;
220 Tag interpreter_frame_local_tag(int index) const;
221 void interpreter_frame_set_local_tag(int index, Tag tag) const;
223 void interpreter_frame_set_locals(intptr_t* locs);
225 // byte code index/pointer (use these functions for unchecked frame access only!)
226 intptr_t interpreter_frame_bcx() const { return *interpreter_frame_bcx_addr(); }
227 void interpreter_frame_set_bcx(intptr_t bcx);
229 // byte code index
230 jint interpreter_frame_bci() const;
231 void interpreter_frame_set_bci(jint bci);
233 // byte code pointer
234 address interpreter_frame_bcp() const;
235 void interpreter_frame_set_bcp(address bcp);
237 // Unchecked access to the method data index/pointer.
238 // Only use this if you know what you are doing.
239 intptr_t interpreter_frame_mdx() const { return *interpreter_frame_mdx_addr(); }
240 void interpreter_frame_set_mdx(intptr_t mdx);
242 // method data pointer
243 address interpreter_frame_mdp() const;
244 void interpreter_frame_set_mdp(address dp);
246 // Find receiver out of caller's (compiled) argument list
247 oop retrieve_receiver(RegisterMap *reg_map);
249 // Return the monitor owner and BasicLock for compiled synchronized
250 // native methods so that biased locking can revoke the receiver's
251 // bias if necessary. Takes optional nmethod for this frame as
252 // argument to avoid performing repeated lookups in code cache.
253 BasicLock* compiled_synchronized_native_monitor (nmethod* nm = NULL);
254 oop compiled_synchronized_native_monitor_owner(nmethod* nm = NULL);
256 // Find receiver for an invoke when arguments are just pushed on stack (i.e., callee stack-frame is
257 // not setup)
258 oop interpreter_callee_receiver(symbolHandle signature) { return *interpreter_callee_receiver_addr(signature); }
261 oop* interpreter_callee_receiver_addr(symbolHandle signature);
264 // expression stack (may go up or down, direction == 1 or -1)
265 public:
266 intptr_t* interpreter_frame_expression_stack() const;
267 static jint interpreter_frame_expression_stack_direction();
269 // The _at version returns a pointer because the address is used for GC.
270 intptr_t* interpreter_frame_expression_stack_at(jint offset) const;
271 Tag interpreter_frame_expression_stack_tag(jint offset) const;
272 void interpreter_frame_set_expression_stack_tag(jint offset, Tag tag) const;
274 // top of expression stack
275 intptr_t* interpreter_frame_tos_at(jint offset) const;
276 intptr_t* interpreter_frame_tos_address() const;
279 jint interpreter_frame_expression_stack_size() const;
281 intptr_t* interpreter_frame_sender_sp() const;
283 #ifndef CC_INTERP
284 // template based interpreter deoptimization support
285 void set_interpreter_frame_sender_sp(intptr_t* sender_sp);
286 void interpreter_frame_set_monitor_end(BasicObjectLock* value);
287 #endif // CC_INTERP
289 // BasicObjectLocks:
290 //
291 // interpreter_frame_monitor_begin is higher in memory than interpreter_frame_monitor_end
292 // Interpreter_frame_monitor_begin points to one element beyond the oldest one,
293 // interpreter_frame_monitor_end points to the youngest one, or if there are none,
294 // it points to one beyond where the first element will be.
295 // interpreter_frame_monitor_size reports the allocation size of a monitor in the interpreter stack.
296 // this value is >= BasicObjectLock::size(), and may be rounded up
298 BasicObjectLock* interpreter_frame_monitor_begin() const;
299 BasicObjectLock* interpreter_frame_monitor_end() const;
300 BasicObjectLock* next_monitor_in_interpreter_frame(BasicObjectLock* current) const;
301 BasicObjectLock* previous_monitor_in_interpreter_frame(BasicObjectLock* current) const;
302 static int interpreter_frame_monitor_size();
304 void interpreter_frame_verify_monitor(BasicObjectLock* value) const;
306 // Tells whether the current interpreter_frame frame pointer
307 // corresponds to the old compiled/deoptimized fp
308 // The receiver used to be a top level frame
309 bool interpreter_frame_equals_unpacked_fp(intptr_t* fp);
311 // Return/result value from this interpreter frame
312 // If the method return type is T_OBJECT or T_ARRAY populates oop_result
313 // For other (non-T_VOID) the appropriate field in the jvalue is populated
314 // with the result value.
315 // Should only be called when at method exit when the method is not
316 // exiting due to an exception.
317 BasicType interpreter_frame_result(oop* oop_result, jvalue* value_result);
319 public:
320 // Method & constant pool cache
321 methodOop interpreter_frame_method() const;
322 void interpreter_frame_set_method(methodOop method);
323 methodOop* interpreter_frame_method_addr() const;
324 constantPoolCacheOop* interpreter_frame_cache_addr() const;
326 public:
327 // Entry frames
328 JavaCallWrapper* entry_frame_call_wrapper() const;
329 intptr_t* entry_frame_argument_at(int offset) const;
331 // tells whether there is another chunk of Delta stack above
332 bool entry_frame_is_first() const;
334 // Compiled frames:
336 public:
337 // Given the index of a local, and the number of argument words
338 // in this stack frame, tell which word of the stack frame to find
339 // the local in. Arguments are stored above the ofp/rpc pair,
340 // while other locals are stored below it.
341 // Since monitors (BasicLock blocks) are also assigned indexes,
342 // but may have different storage requirements, their presence
343 // can also affect the calculation of offsets.
344 static int local_offset_for_compiler(int local_index, int nof_args, int max_nof_locals, int max_nof_monitors);
346 // Given the index of a monitor, etc., tell which word of the
347 // stack frame contains the start of the BasicLock block.
348 // Note that the local index by convention is the __higher__
349 // of the two indexes allocated to the block.
350 static int monitor_offset_for_compiler(int local_index, int nof_args, int max_nof_locals, int max_nof_monitors);
352 // Tell the smallest value that local_offset_for_compiler will attain.
353 // This is used to help determine how much stack frame to allocate.
354 static int min_local_offset_for_compiler(int nof_args, int max_nof_locals, int max_nof_monitors);
356 // Tells if this register must be spilled during a call.
357 // On Intel, all registers are smashed by calls.
358 static bool volatile_across_calls(Register reg);
361 // Safepoints
363 public:
364 oop saved_oop_result(RegisterMap* map) const;
365 void set_saved_oop_result(RegisterMap* map, oop obj);
367 // For debugging
368 private:
369 const char* print_name() const;
371 public:
372 void print_value() const { print_value_on(tty,NULL); }
373 void print_value_on(outputStream* st, JavaThread *thread) const;
374 void print_on(outputStream* st) const;
375 void interpreter_frame_print_on(outputStream* st) const;
376 void print_on_error(outputStream* st, char* buf, int buflen, bool verbose = false) const;
378 // Conversion from an VMReg to physical stack location
379 oop* oopmapreg_to_location(VMReg reg, const RegisterMap* regmap) const;
381 // Oops-do's
382 void oops_compiled_arguments_do(symbolHandle signature, bool has_receiver, const RegisterMap* reg_map, OopClosure* f);
383 void oops_interpreted_do(OopClosure* f, const RegisterMap* map, bool query_oop_map_cache = true);
385 private:
386 void oops_interpreted_locals_do(OopClosure *f,
387 int max_locals,
388 InterpreterOopMap *mask);
389 void oops_interpreted_expressions_do(OopClosure *f, symbolHandle signature,
390 bool has_receiver, int max_stack, int max_locals,
391 InterpreterOopMap *mask);
392 void oops_interpreted_arguments_do(symbolHandle signature, bool has_receiver, OopClosure* f);
394 // Iteration of oops
395 void oops_do_internal(OopClosure* f, CodeBlobClosure* cf, RegisterMap* map, bool use_interpreter_oop_map_cache);
396 void oops_entry_do(OopClosure* f, const RegisterMap* map);
397 void oops_code_blob_do(OopClosure* f, CodeBlobClosure* cf, const RegisterMap* map);
398 int adjust_offset(methodOop method, int index); // helper for above fn
399 public:
400 // Memory management
401 void oops_do(OopClosure* f, CodeBlobClosure* cf, RegisterMap* map) { oops_do_internal(f, cf, map, true); }
402 void nmethods_do(CodeBlobClosure* cf);
404 void gc_prologue();
405 void gc_epilogue();
406 void pd_gc_epilog();
408 # ifdef ENABLE_ZAP_DEAD_LOCALS
409 private:
410 class CheckValueClosure: public OopClosure {
411 public:
412 void do_oop(oop* p);
413 void do_oop(narrowOop* p) { ShouldNotReachHere(); }
414 };
415 static CheckValueClosure _check_value;
417 class CheckOopClosure: public OopClosure {
418 public:
419 void do_oop(oop* p);
420 void do_oop(narrowOop* p) { ShouldNotReachHere(); }
421 };
422 static CheckOopClosure _check_oop;
424 static void check_derived_oop(oop* base, oop* derived);
426 class ZapDeadClosure: public OopClosure {
427 public:
428 void do_oop(oop* p);
429 void do_oop(narrowOop* p) { ShouldNotReachHere(); }
430 };
431 static ZapDeadClosure _zap_dead;
433 public:
434 // Zapping
435 void zap_dead_locals (JavaThread* thread, const RegisterMap* map);
436 void zap_dead_interpreted_locals(JavaThread* thread, const RegisterMap* map);
437 void zap_dead_compiled_locals (JavaThread* thread, const RegisterMap* map);
438 void zap_dead_entry_locals (JavaThread* thread, const RegisterMap* map);
439 void zap_dead_deoptimized_locals(JavaThread* thread, const RegisterMap* map);
440 # endif
441 // Verification
442 void verify(const RegisterMap* map);
443 static bool verify_return_pc(address x);
444 static bool is_bci(intptr_t bcx);
445 // Usage:
446 // assert(frame::verify_return_pc(return_address), "must be a return pc");
448 int pd_oop_map_offset_adjustment() const;
450 # include "incls/_frame_pd.hpp.incl"
451 };
454 //
455 // StackFrameStream iterates through the frames of a thread starting from
456 // top most frame. It automatically takes care of updating the location of
457 // all (callee-saved) registers. Notice: If a thread is stopped at
458 // a safepoint, all registers are saved, not only the callee-saved ones.
459 //
460 // Use:
461 //
462 // for(StackFrameStream fst(thread); !fst.is_done(); fst.next()) {
463 // ...
464 // }
465 //
466 class StackFrameStream : public StackObj {
467 private:
468 frame _fr;
469 RegisterMap _reg_map;
470 bool _is_done;
471 public:
472 StackFrameStream(JavaThread *thread, bool update = true);
474 // Iteration
475 bool is_done() { return (_is_done) ? true : (_is_done = _fr.is_first_frame(), false); }
476 void next() { if (!_is_done) _fr = _fr.sender(&_reg_map); }
478 // Query
479 frame *current() { return &_fr; }
480 RegisterMap* register_map() { return &_reg_map; }
481 };