1 /*
2 * Copyright 2001-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 class FastLockNode;
26 class FastUnlockNode;
27 class IdealKit;
28 class Parse;
29 class RootNode;
30
31 //-----------------------------------------------------------------------------
32 //----------------------------GraphKit-----------------------------------------
33 // Toolkit for building the common sorts of subgraphs.
34 // Does not know about bytecode parsing or type-flow results.
35 // It is able to create graphs implementing the semantics of most
36 // or all bytecodes, so that it can expand intrinsics and calls.
37 // It may depend on JVMState structure, but it must not depend
38 // on specific bytecode streams.
39 class GraphKit : public Phase {
40 friend class PreserveJVMState;
41
42 protected:
43 ciEnv* _env; // Compilation environment
44 PhaseGVN &_gvn; // Some optimizations while parsing
45 SafePointNode* _map; // Parser map from JVM to Nodes
46 SafePointNode* _exceptions;// Parser map(s) for exception state(s)
47 int _sp; // JVM Expression Stack Pointer
48 int _bci; // JVM Bytecode Pointer
49 ciMethod* _method; // JVM Current Method
50
51 private:
52 SafePointNode* map_not_null() const {
53 assert(_map != NULL, "must call stopped() to test for reset compiler map");
54 return _map;
55 }
56
57 public:
58 GraphKit(); // empty constructor
59 GraphKit(JVMState* jvms); // the JVM state on which to operate
60
61 #ifdef ASSERT
62 ~GraphKit() {
63 assert(!has_exceptions(), "user must call transfer_exceptions_into_jvms");
64 }
65 #endif
66
67 virtual Parse* is_Parse() const { return NULL; }
68
69 ciEnv* env() const { return _env; }
70 PhaseGVN& gvn() const { return _gvn; }
71
72 void record_for_igvn(Node* n) const { C->record_for_igvn(n); } // delegate to Compile
73
74 // Handy well-known nodes:
75 Node* null() const { return zerocon(T_OBJECT); }
76 Node* top() const { return C->top(); }
77 RootNode* root() const { return C->root(); }
78
79 // Create or find a constant node
80 Node* intcon(jint con) const { return _gvn.intcon(con); }
81 Node* longcon(jlong con) const { return _gvn.longcon(con); }
82 Node* makecon(const Type *t) const { return _gvn.makecon(t); }
83 Node* zerocon(BasicType bt) const { return _gvn.zerocon(bt); }
84 // (See also macro MakeConX in type.hpp, which uses intcon or longcon.)
85
86 // Helper for byte_map_base
87 Node* byte_map_base_node() {
88 // Get base of card map
89 CardTableModRefBS* ct = (CardTableModRefBS*)(Universe::heap()->barrier_set());
90 assert(sizeof(*ct->byte_map_base) == sizeof(jbyte), "adjust users of this code");
91 if (ct->byte_map_base != NULL) {
92 return makecon(TypeRawPtr::make((address)ct->byte_map_base));
93 } else {
94 return null();
95 }
96 }
97
98 jint find_int_con(Node* n, jint value_if_unknown) {
99 return _gvn.find_int_con(n, value_if_unknown);
100 }
101 jlong find_long_con(Node* n, jlong value_if_unknown) {
102 return _gvn.find_long_con(n, value_if_unknown);
103 }
104 // (See also macro find_intptr_t_con in type.hpp, which uses one of these.)
105
106 // JVM State accessors:
107 // Parser mapping from JVM indices into Nodes.
108 // Low slots are accessed by the StartNode::enum.
109 // Then come the locals at StartNode::Parms to StartNode::Parms+max_locals();
110 // Then come JVM stack slots.
111 // Finally come the monitors, if any.
112 // See layout accessors in class JVMState.
113
114 SafePointNode* map() const { return _map; }
115 bool has_exceptions() const { return _exceptions != NULL; }
116 JVMState* jvms() const { return map_not_null()->_jvms; }
117 int sp() const { return _sp; }
118 int bci() const { return _bci; }
119 Bytecodes::Code java_bc() const;
120 ciMethod* method() const { return _method; }
121
122 void set_jvms(JVMState* jvms) { set_map(jvms->map());
123 assert(jvms == this->jvms(), "sanity");
124 _sp = jvms->sp();
125 _bci = jvms->bci();
126 _method = jvms->has_method() ? jvms->method() : NULL; }
127 void set_map(SafePointNode* m) { _map = m; debug_only(verify_map()); }
128 void set_sp(int i) { assert(i >= 0, "must be non-negative"); _sp = i; }
129 void clean_stack(int from_sp); // clear garbage beyond from_sp to top
130
131 void inc_sp(int i) { set_sp(sp() + i); }
132 void set_bci(int bci) { _bci = bci; }
133
134 // Make sure jvms has current bci & sp.
135 JVMState* sync_jvms() const;
136 #ifdef ASSERT
137 // Make sure JVMS has an updated copy of bci and sp.
138 // Also sanity-check method, depth, and monitor depth.
139 bool jvms_in_sync() const;
140
141 // Make sure the map looks OK.
142 void verify_map() const;
143
144 // Make sure a proposed exception state looks OK.
145 static void verify_exception_state(SafePointNode* ex_map);
146 #endif
147
148 // Clone the existing map state. (Implements PreserveJVMState.)
149 SafePointNode* clone_map();
150
151 // Set the map to a clone of the given one.
152 void set_map_clone(SafePointNode* m);
153
154 // Tell if the compilation is failing.
155 bool failing() const { return C->failing(); }
156
157 // Set _map to NULL, signalling a stop to further bytecode execution.
158 // Preserve the map intact for future use, and return it back to the caller.
159 SafePointNode* stop() { SafePointNode* m = map(); set_map(NULL); return m; }
160
161 // Stop, but first smash the map's inputs to NULL, to mark it dead.
162 void stop_and_kill_map();
163
164 // Tell if _map is NULL, or control is top.
165 bool stopped();
166
167 // Tell if this method or any caller method has exception handlers.
168 bool has_ex_handler();
169
170 // Save an exception without blowing stack contents or other JVM state.
171 // (The extra pointer is stuck with add_req on the map, beyond the JVMS.)
172 static void set_saved_ex_oop(SafePointNode* ex_map, Node* ex_oop);
173
174 // Recover a saved exception from its map.
175 static Node* saved_ex_oop(SafePointNode* ex_map);
176
177 // Recover a saved exception from its map, and remove it from the map.
178 static Node* clear_saved_ex_oop(SafePointNode* ex_map);
179
180 #ifdef ASSERT
181 // Recover a saved exception from its map, and remove it from the map.
182 static bool has_saved_ex_oop(SafePointNode* ex_map);
183 #endif
184
185 // Push an exception in the canonical position for handlers (stack(0)).
186 void push_ex_oop(Node* ex_oop) {
187 ensure_stack(1); // ensure room to push the exception
188 set_stack(0, ex_oop);
189 set_sp(1);
190 clean_stack(1);
191 }
192
193 // Detach and return an exception state.
194 SafePointNode* pop_exception_state() {
195 SafePointNode* ex_map = _exceptions;
196 if (ex_map != NULL) {
197 _exceptions = ex_map->next_exception();
198 ex_map->set_next_exception(NULL);
199 debug_only(verify_exception_state(ex_map));
200 }
201 return ex_map;
202 }
203
204 // Add an exception, using the given JVM state, without commoning.
205 void push_exception_state(SafePointNode* ex_map) {
206 debug_only(verify_exception_state(ex_map));
207 ex_map->set_next_exception(_exceptions);
208 _exceptions = ex_map;
209 }
210
211 // Turn the current JVM state into an exception state, appending the ex_oop.
212 SafePointNode* make_exception_state(Node* ex_oop);
213
214 // Add an exception, using the given JVM state.
215 // Combine all exceptions with a common exception type into a single state.
216 // (This is done via combine_exception_states.)
217 void add_exception_state(SafePointNode* ex_map);
218
219 // Combine all exceptions of any sort whatever into a single master state.
220 SafePointNode* combine_and_pop_all_exception_states() {
221 if (_exceptions == NULL) return NULL;
222 SafePointNode* phi_map = pop_exception_state();
223 SafePointNode* ex_map;
224 while ((ex_map = pop_exception_state()) != NULL) {
225 combine_exception_states(ex_map, phi_map);
226 }
227 return phi_map;
228 }
229
230 // Combine the two exception states, building phis as necessary.
231 // The second argument is updated to include contributions from the first.
232 void combine_exception_states(SafePointNode* ex_map, SafePointNode* phi_map);
233
234 // Reset the map to the given state. If there are any half-finished phis
235 // in it (created by combine_exception_states), transform them now.
236 // Returns the exception oop. (Caller must call push_ex_oop if required.)
237 Node* use_exception_state(SafePointNode* ex_map);
238
239 // Collect exceptions from a given JVM state into my exception list.
240 void add_exception_states_from(JVMState* jvms);
241
242 // Collect all raised exceptions into the current JVM state.
243 // Clear the current exception list and map, returns the combined states.
244 JVMState* transfer_exceptions_into_jvms();
245
246 // Helper to throw a built-in exception.
247 // Range checks take the offending index.
248 // Cast and array store checks take the offending class.
249 // Others do not take the optional argument.
250 // The JVMS must allow the bytecode to be re-executed
251 // via an uncommon trap.
252 void builtin_throw(Deoptimization::DeoptReason reason, Node* arg = NULL);
253
254 // Helper Functions for adding debug information
255 void kill_dead_locals();
256 #ifdef ASSERT
257 bool dead_locals_are_killed();
258 #endif
259 // The call may deoptimize. Supply required JVM state as debug info.
260 // If must_throw is true, the call is guaranteed not to return normally.
261 void add_safepoint_edges(SafePointNode* call,
262 bool must_throw = false);
263
264 // How many stack inputs does the current BC consume?
265 // And, how does the stack change after the bytecode?
266 // Returns false if unknown.
267 bool compute_stack_effects(int& inputs, int& depth);
268
269 // Add a fixed offset to a pointer
270 Node* basic_plus_adr(Node* base, Node* ptr, intptr_t offset) {
271 return basic_plus_adr(base, ptr, MakeConX(offset));
272 }
273 Node* basic_plus_adr(Node* base, intptr_t offset) {
274 return basic_plus_adr(base, base, MakeConX(offset));
275 }
276 // Add a variable offset to a pointer
277 Node* basic_plus_adr(Node* base, Node* offset) {
278 return basic_plus_adr(base, base, offset);
279 }
280 Node* basic_plus_adr(Node* base, Node* ptr, Node* offset);
281
282 // Convert between int and long, and size_t.
283 // (See macros ConvI2X, etc., in type.hpp for ConvI2X, etc.)
284 Node* ConvI2L(Node* offset);
285 Node* ConvL2I(Node* offset);
286 // Find out the klass of an object.
287 Node* load_object_klass(Node* object);
288 // Find out the length of an array.
289 Node* load_array_length(Node* array);
290 // Helper function to do a NULL pointer check or ZERO check based on type.
291 Node* null_check_common(Node* value, BasicType type,
292 bool assert_null, Node* *null_control);
293 // Throw an exception if a given value is null.
294 // Return the value cast to not-null.
295 // Be clever about equivalent dominating null checks.
296 Node* do_null_check(Node* value, BasicType type) {
297 return null_check_common(value, type, false, NULL);
298 }
299 // Throw an uncommon trap if a given value is __not__ null.
300 // Return the value cast to null, and be clever about dominating checks.
301 Node* do_null_assert(Node* value, BasicType type) {
302 return null_check_common(value, type, true, NULL);
303 }
304 // Null check oop. Return null-path control into (*null_control).
305 // Return a cast-not-null node which depends on the not-null control.
306 // If never_see_null, use an uncommon trap (*null_control sees a top).
307 // The cast is not valid along the null path; keep a copy of the original.
308 Node* null_check_oop(Node* value, Node* *null_control,
309 bool never_see_null = false);
310
311 // Cast obj to not-null on this path
312 Node* cast_not_null(Node* obj, bool do_replace_in_map = true);
313 // Replace all occurrences of one node by another.
314 void replace_in_map(Node* old, Node* neww);
315
316 void push(Node* n) { map_not_null(); _map->set_stack(_map->_jvms,_sp++,n); }
317 Node* pop() { map_not_null(); return _map->stack(_map->_jvms,--_sp); }
318 Node* peek(int off=0) { map_not_null(); return _map->stack(_map->_jvms, _sp - off - 1); }
319
320 void push_pair(Node* ldval) {
321 push(ldval);
322 push(top()); // the halfword is merely a placeholder
323 }
324 void push_pair_local(int i) {
325 // longs are stored in locals in "push" order
326 push( local(i+0) ); // the real value
327 assert(local(i+1) == top(), "");
328 push(top()); // halfword placeholder
329 }
330 Node* pop_pair() {
331 // the second half is pushed last & popped first; it contains exactly nothing
332 Node* halfword = pop();
333 assert(halfword == top(), "");
334 // the long bits are pushed first & popped last:
335 return pop();
336 }
337 void set_pair_local(int i, Node* lval) {
338 // longs are stored in locals as a value/half pair (like doubles)
339 set_local(i+0, lval);
340 set_local(i+1, top());
341 }
342
343 // Push the node, which may be zero, one, or two words.
344 void push_node(BasicType n_type, Node* n) {
345 int n_size = type2size[n_type];
346 if (n_size == 1) push( n ); // T_INT, ...
347 else if (n_size == 2) push_pair( n ); // T_DOUBLE, T_LONG
348 else { assert(n_size == 0, "must be T_VOID"); }
349 }
350
351 Node* pop_node(BasicType n_type) {
352 int n_size = type2size[n_type];
353 if (n_size == 1) return pop();
354 else if (n_size == 2) return pop_pair();
355 else return NULL;
356 }
357
358 Node* control() const { return map_not_null()->control(); }
359 Node* i_o() const { return map_not_null()->i_o(); }
360 Node* returnadr() const { return map_not_null()->returnadr(); }
361 Node* frameptr() const { return map_not_null()->frameptr(); }
362 Node* local(uint idx) const { map_not_null(); return _map->local( _map->_jvms, idx); }
363 Node* stack(uint idx) const { map_not_null(); return _map->stack( _map->_jvms, idx); }
364 Node* argument(uint idx) const { map_not_null(); return _map->argument( _map->_jvms, idx); }
365 Node* monitor_box(uint idx) const { map_not_null(); return _map->monitor_box(_map->_jvms, idx); }
366 Node* monitor_obj(uint idx) const { map_not_null(); return _map->monitor_obj(_map->_jvms, idx); }
367
368 void set_control (Node* c) { map_not_null()->set_control(c); }
369 void set_i_o (Node* c) { map_not_null()->set_i_o(c); }
370 void set_local(uint idx, Node* c) { map_not_null(); _map->set_local( _map->_jvms, idx, c); }
371 void set_stack(uint idx, Node* c) { map_not_null(); _map->set_stack( _map->_jvms, idx, c); }
372 void set_argument(uint idx, Node* c){ map_not_null(); _map->set_argument(_map->_jvms, idx, c); }
373 void ensure_stack(uint stk_size) { map_not_null(); _map->ensure_stack(_map->_jvms, stk_size); }
374
375 // Access unaliased memory
376 Node* memory(uint alias_idx);
377 Node* memory(const TypePtr *tp) { return memory(C->get_alias_index(tp)); }
378 Node* memory(Node* adr) { return memory(_gvn.type(adr)->is_ptr()); }
379
380 // Access immutable memory
381 Node* immutable_memory() { return C->immutable_memory(); }
382
383 // Set unaliased memory
384 void set_memory(Node* c, uint alias_idx) { merged_memory()->set_memory_at(alias_idx, c); }
385 void set_memory(Node* c, const TypePtr *tp) { set_memory(c,C->get_alias_index(tp)); }
386 void set_memory(Node* c, Node* adr) { set_memory(c,_gvn.type(adr)->is_ptr()); }
387
388 // Get the entire memory state (probably a MergeMemNode), and reset it
389 // (The resetting prevents somebody from using the dangling Node pointer.)
390 Node* reset_memory();
391
392 // Get the entire memory state, asserted to be a MergeMemNode.
393 MergeMemNode* merged_memory() {
394 Node* mem = map_not_null()->memory();
395 assert(mem->is_MergeMem(), "parse memory is always pre-split");
396 return mem->as_MergeMem();
397 }
398
399 // Set the entire memory state; produce a new MergeMemNode.
400 void set_all_memory(Node* newmem);
401
402 // Create a memory projection from the call, then set_all_memory.
403 void set_all_memory_call(Node* call);
404
405 // Create a LoadNode, reading from the parser's memory state.
406 // (Note: require_atomic_access is useful only with T_LONG.)
407 Node* make_load(Node* ctl, Node* adr, const Type* t, BasicType bt,
408 bool require_atomic_access = false) {
409 // This version computes alias_index from bottom_type
410 return make_load(ctl, adr, t, bt, adr->bottom_type()->is_ptr(),
411 require_atomic_access);
412 }
413 Node* make_load(Node* ctl, Node* adr, const Type* t, BasicType bt, const TypePtr* adr_type, bool require_atomic_access = false) {
414 // This version computes alias_index from an address type
415 assert(adr_type != NULL, "use other make_load factory");
416 return make_load(ctl, adr, t, bt, C->get_alias_index(adr_type),
417 require_atomic_access);
418 }
419 // This is the base version which is given an alias index.
420 Node* make_load(Node* ctl, Node* adr, const Type* t, BasicType bt, int adr_idx, bool require_atomic_access = false);
421
422 // Create & transform a StoreNode and store the effect into the
423 // parser's memory state.
424 Node* store_to_memory(Node* ctl, Node* adr, Node* val, BasicType bt,
425 const TypePtr* adr_type,
426 bool require_atomic_access = false) {
427 // This version computes alias_index from an address type
428 assert(adr_type != NULL, "use other store_to_memory factory");
429 return store_to_memory(ctl, adr, val, bt,
430 C->get_alias_index(adr_type),
431 require_atomic_access);
432 }
433 // This is the base version which is given alias index
434 // Return the new StoreXNode
435 Node* store_to_memory(Node* ctl, Node* adr, Node* val, BasicType bt,
436 int adr_idx,
437 bool require_atomic_access = false);
438
439
440 // All in one pre-barrier, store, post_barrier
441 // Insert a write-barrier'd store. This is to let generational GC
442 // work; we have to flag all oop-stores before the next GC point.
443 //
444 // It comes in 3 flavors of store to an object, array, or unknown.
445 // We use precise card marks for arrays to avoid scanning the entire
446 // array. We use imprecise for object. We use precise for unknown
447 // since we don't know if we have an array or and object or even
448 // where the object starts.
449 //
450 // If val==NULL, it is taken to be a completely unknown value. QQQ
451
452 Node* store_oop_to_object(Node* ctl,
453 Node* obj, // containing obj
454 Node* adr, // actual adress to store val at
455 const TypePtr* adr_type,
456 Node* val,
457 const TypeOopPtr* val_type,
458 BasicType bt);
459
460 Node* store_oop_to_array(Node* ctl,
461 Node* obj, // containing obj
462 Node* adr, // actual adress to store val at
463 const TypePtr* adr_type,
464 Node* val,
465 const TypeOopPtr* val_type,
466 BasicType bt);
467
468 // Could be an array or object we don't know at compile time (unsafe ref.)
469 Node* store_oop_to_unknown(Node* ctl,
470 Node* obj, // containing obj
471 Node* adr, // actual adress to store val at
472 const TypePtr* adr_type,
473 Node* val,
474 BasicType bt);
475
476 // For the few case where the barriers need special help
477 void pre_barrier(Node* ctl, Node* obj, Node* adr, uint adr_idx,
478 Node* val, const TypeOopPtr* val_type, BasicType bt);
479
480 void post_barrier(Node* ctl, Node* store, Node* obj, Node* adr, uint adr_idx,
481 Node* val, BasicType bt, bool use_precise);
482
483 // Return addressing for an array element.
484 Node* array_element_address(Node* ary, Node* idx, BasicType elembt,
485 // Optional constraint on the array size:
486 const TypeInt* sizetype = NULL);
487
488 // Return a load of array element at idx.
489 Node* load_array_element(Node* ctl, Node* ary, Node* idx, const TypeAryPtr* arytype);
490
491 // CMS card-marks have an input from the corresponding oop_store
492 void cms_card_mark(Node* ctl, Node* adr, Node* val, Node* oop_store);
493
494 //---------------- Dtrace support --------------------
495 void make_dtrace_method_entry_exit(ciMethod* method, bool is_entry);
496 void make_dtrace_method_entry(ciMethod* method) {
497 make_dtrace_method_entry_exit(method, true);
498 }
499 void make_dtrace_method_exit(ciMethod* method) {
500 make_dtrace_method_entry_exit(method, false);
501 }
502
503 //--------------- stub generation -------------------
504 public:
505 void gen_stub(address C_function,
506 const char *name,
507 int is_fancy_jump,
508 bool pass_tls,
509 bool return_pc);
510
511 //---------- help for generating calls --------------
512
513 // Do a null check on the receiver, which is in argument(0).
514 Node* null_check_receiver(ciMethod* callee) {
515 assert(!callee->is_static(), "must be a virtual method");
516 int nargs = 1 + callee->signature()->size();
517 // Null check on self without removing any arguments. The argument
518 // null check technically happens in the wrong place, which can lead to
519 // invalid stack traces when the primitive is inlined into a method
520 // which handles NullPointerExceptions.
521 Node* receiver = argument(0);
522 _sp += nargs;
523 receiver = do_null_check(receiver, T_OBJECT);
524 _sp -= nargs;
525 return receiver;
526 }
527
528 // Fill in argument edges for the call from argument(0), argument(1), ...
529 // (The next step is to call set_edges_for_java_call.)
530 void set_arguments_for_java_call(CallJavaNode* call);
531
532 // Fill in non-argument edges for the call.
533 // Transform the call, and update the basics: control, i_o, memory.
534 // (The next step is usually to call set_results_for_java_call.)
535 void set_edges_for_java_call(CallJavaNode* call,
536 bool must_throw = false);
537
538 // Finish up a java call that was started by set_edges_for_java_call.
539 // Call add_exception on any throw arising from the call.
540 // Return the call result (transformed).
541 Node* set_results_for_java_call(CallJavaNode* call);
542
543 // Similar to set_edges_for_java_call, but simplified for runtime calls.
544 void set_predefined_output_for_runtime_call(Node* call) {
545 set_predefined_output_for_runtime_call(call, NULL, NULL);
546 }
547 void set_predefined_output_for_runtime_call(Node* call,
548 Node* keep_mem,
549 const TypePtr* hook_mem);
550 Node* set_predefined_input_for_runtime_call(SafePointNode* call);
551
552 // helper functions for statistics
553 void increment_counter(address counter_addr); // increment a debug counter
554 void increment_counter(Node* counter_addr); // increment a debug counter
555
556 // Bail out to the interpreter right now
557 // The optional klass is the one causing the trap.
558 // The optional reason is debug information written to the compile log.
559 // Optional must_throw is the same as with add_safepoint_edges.
560 void uncommon_trap(int trap_request,
561 ciKlass* klass = NULL, const char* reason_string = NULL,
562 bool must_throw = false, bool keep_exact_action = false);
563
564 // Shorthand, to avoid saying "Deoptimization::" so many times.
565 void uncommon_trap(Deoptimization::DeoptReason reason,
566 Deoptimization::DeoptAction action,
567 ciKlass* klass = NULL, const char* reason_string = NULL,
568 bool must_throw = false, bool keep_exact_action = false) {
569 uncommon_trap(Deoptimization::make_trap_request(reason, action),
570 klass, reason_string, must_throw, keep_exact_action);
571 }
572
573 // Report if there were too many traps at the current method and bci.
574 // Report if a trap was recorded, and/or PerMethodTrapLimit was exceeded.
575 // If there is no MDO at all, report no trap unless told to assume it.
576 bool too_many_traps(Deoptimization::DeoptReason reason) {
577 return C->too_many_traps(method(), bci(), reason);
578 }
579
580 // Report if there were too many recompiles at the current method and bci.
581 bool too_many_recompiles(Deoptimization::DeoptReason reason) {
582 return C->too_many_recompiles(method(), bci(), reason);
583 }
584
585 // vanilla/CMS post barrier
586 void write_barrier_post(Node *store, Node* obj, Node* adr, Node* val, bool use_precise);
587
588 // Returns the object (if any) which was created the moment before.
589 Node* just_allocated_object(Node* current_control);
590
591 static bool use_ReduceInitialCardMarks() {
592 return (ReduceInitialCardMarks
593 && Universe::heap()->can_elide_tlab_store_barriers());
594 }
595
596 // G1 pre/post barriers
597 void g1_write_barrier_pre(Node* obj,
598 Node* adr,
599 uint alias_idx,
600 Node* val,
601 const TypeOopPtr* val_type,
602 BasicType bt);
603
604 void g1_write_barrier_post(Node* store,
605 Node* obj,
606 Node* adr,
607 uint alias_idx,
608 Node* val,
609 BasicType bt,
610 bool use_precise);
611 // Helper function for g1
612 private:
613 void g1_mark_card(IdealKit* ideal, Node* card_adr, Node* store, Node* index, Node* index_adr,
614 Node* buffer, const TypeFunc* tf);
615
616 public:
617 // Helper function to round double arguments before a call
618 void round_double_arguments(ciMethod* dest_method);
619 void round_double_result(ciMethod* dest_method);
620
621 // rounding for strict float precision conformance
622 Node* precision_rounding(Node* n);
623
624 // rounding for strict double precision conformance
625 Node* dprecision_rounding(Node* n);
626
627 // rounding for non-strict double stores
628 Node* dstore_rounding(Node* n);
629
630 // Helper functions for fast/slow path codes
631 Node* opt_iff(Node* region, Node* iff);
632 Node* make_runtime_call(int flags,
633 const TypeFunc* call_type, address call_addr,
634 const char* call_name,
635 const TypePtr* adr_type, // NULL if no memory effects
636 Node* parm0 = NULL, Node* parm1 = NULL,
637 Node* parm2 = NULL, Node* parm3 = NULL,
638 Node* parm4 = NULL, Node* parm5 = NULL,
639 Node* parm6 = NULL, Node* parm7 = NULL);
640 enum { // flag values for make_runtime_call
641 RC_NO_FP = 1, // CallLeafNoFPNode
642 RC_NO_IO = 2, // do not hook IO edges
643 RC_NO_LEAF = 4, // CallStaticJavaNode
644 RC_MUST_THROW = 8, // flag passed to add_safepoint_edges
645 RC_NARROW_MEM = 16, // input memory is same as output
646 RC_UNCOMMON = 32, // freq. expected to be like uncommon trap
647 RC_LEAF = 0 // null value: no flags set
648 };
649
650 // merge in all memory slices from new_mem, along the given path
651 void merge_memory(Node* new_mem, Node* region, int new_path);
652 void make_slow_call_ex(Node* call, ciInstanceKlass* ex_klass, bool separate_io_proj);
653
654 // Helper functions to build synchronizations
655 int next_monitor();
656 Node* insert_mem_bar(int opcode, Node* precedent = NULL);
657 Node* insert_mem_bar_volatile(int opcode, int alias_idx, Node* precedent = NULL);
658 // Optional 'precedent' is appended as an extra edge, to force ordering.
659 FastLockNode* shared_lock(Node* obj);
660 void shared_unlock(Node* box, Node* obj);
661
662 // helper functions for the fast path/slow path idioms
663 Node* fast_and_slow(Node* in, const Type *result_type, Node* null_result, IfNode* fast_test, Node* fast_result, address slow_call, const TypeFunc *slow_call_type, Node* slow_arg, klassOop ex_klass, Node* slow_result);
664
665 // Generate an instance-of idiom. Used by both the instance-of bytecode
666 // and the reflective instance-of call.
667 Node* gen_instanceof( Node *subobj, Node* superkls );
668
669 // Generate a check-cast idiom. Used by both the check-cast bytecode
670 // and the array-store bytecode
671 Node* gen_checkcast( Node *subobj, Node* superkls,
672 Node* *failure_control = NULL );
673
674 // Generate a subtyping check. Takes as input the subtype and supertype.
675 // Returns 2 values: sets the default control() to the true path and
676 // returns the false path. Only reads from constant memory taken from the
677 // default memory; does not write anything. It also doesn't take in an
678 // Object; if you wish to check an Object you need to load the Object's
679 // class prior to coming here.
680 Node* gen_subtype_check(Node* subklass, Node* superklass);
681
682 // Static parse-time type checking logic for gen_subtype_check:
683 enum { SSC_always_false, SSC_always_true, SSC_easy_test, SSC_full_test };
684 int static_subtype_check(ciKlass* superk, ciKlass* subk);
685
686 // Exact type check used for predicted calls and casts.
687 // Rewrites (*casted_receiver) to be casted to the stronger type.
688 // (Caller is responsible for doing replace_in_map.)
689 Node* type_check_receiver(Node* receiver, ciKlass* klass, float prob,
690 Node* *casted_receiver);
691
692 // implementation of object creation
693 Node* set_output_for_allocation(AllocateNode* alloc,
694 const TypeOopPtr* oop_type,
695 bool raw_mem_only);
696 Node* get_layout_helper(Node* klass_node, jint& constant_value);
697 Node* new_instance(Node* klass_node,
698 Node* slow_test = NULL,
699 bool raw_mem_only = false,
700 Node* *return_size_val = NULL);
701 Node* new_array(Node* klass_node, Node* count_val, int nargs,
702 bool raw_mem_only = false, Node* *return_size_val = NULL);
703
704 // Handy for making control flow
705 IfNode* create_and_map_if(Node* ctrl, Node* tst, float prob, float cnt) {
706 IfNode* iff = new (C, 2) IfNode(ctrl, tst, prob, cnt);// New IfNode's
707 _gvn.set_type(iff, iff->Value(&_gvn)); // Value may be known at parse-time
708 // Place 'if' on worklist if it will be in graph
709 if (!tst->is_Con()) record_for_igvn(iff); // Range-check and Null-check removal is later
710 return iff;
711 }
712
713 IfNode* create_and_xform_if(Node* ctrl, Node* tst, float prob, float cnt) {
714 IfNode* iff = new (C, 2) IfNode(ctrl, tst, prob, cnt);// New IfNode's
715 _gvn.transform(iff); // Value may be known at parse-time
716 // Place 'if' on worklist if it will be in graph
717 if (!tst->is_Con()) record_for_igvn(iff); // Range-check and Null-check removal is later
718 return iff;
719 }
720 };
721
722 // Helper class to support building of control flow branches. Upon
723 // creation the map and sp at bci are cloned and restored upon de-
724 // struction. Typical use:
725 //
726 // { PreserveJVMState pjvms(this);
727 // // code of new branch
728 // }
729 // // here the JVM state at bci is established
730
731 class PreserveJVMState: public StackObj {
732 protected:
733 GraphKit* _kit;
734 #ifdef ASSERT
735 int _block; // PO of current block, if a Parse
736 int _bci;
737 #endif
738 SafePointNode* _map;
739 uint _sp;
740
741 public:
742 PreserveJVMState(GraphKit* kit, bool clone_map = true);
743 ~PreserveJVMState();
744 };
745
746 // Helper class to build cutouts of the form if (p) ; else {x...}.
747 // The code {x...} must not fall through.
748 // The kit's main flow of control is set to the "then" continuation of if(p).
749 class BuildCutout: public PreserveJVMState {
750 public:
751 BuildCutout(GraphKit* kit, Node* p, float prob, float cnt = COUNT_UNKNOWN);
752 ~BuildCutout();
753 };
754
755 // Helper class to preserve the original _reexecute bit and _sp and restore
756 // them back
757 class PreserveReexecuteAndSP: public StackObj {
758 protected:
759 GraphKit* _kit;
760 uint _sp;
761 bool _reexecute;
762
763 public:
764 PreserveReexecuteAndSP(GraphKit* kit);
765 ~PreserveReexecuteAndSP();
766 };