Tue, 04 Oct 2011 14:30:04 -0700
6865265: JVM crashes with "missing exception handler" error
Summary: Retry the call to fast_exception_handler_bci_for() after it returned with a pending exception. Don't cache the exception handler pc computed by compute_compiled_exc_handler() if the handler is for another (nested) exception.
Reviewed-by: kamg, kvn
Contributed-by: volker.simonis@gmail.com
1 /*
2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 * This code is free software; you can redistribute it and/or modify it
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 * accompanied this code).
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25 #ifndef SHARE_VM_OPTO_GRAPHKIT_HPP
26 #define SHARE_VM_OPTO_GRAPHKIT_HPP
28 #include "ci/ciEnv.hpp"
29 #include "ci/ciMethodData.hpp"
30 #include "opto/addnode.hpp"
31 #include "opto/callnode.hpp"
32 #include "opto/cfgnode.hpp"
33 #include "opto/compile.hpp"
34 #include "opto/divnode.hpp"
35 #include "opto/mulnode.hpp"
36 #include "opto/phaseX.hpp"
37 #include "opto/subnode.hpp"
38 #include "opto/type.hpp"
39 #include "runtime/deoptimization.hpp"
41 class FastLockNode;
42 class FastUnlockNode;
43 class IdealKit;
44 class Parse;
45 class RootNode;
47 //-----------------------------------------------------------------------------
48 //----------------------------GraphKit-----------------------------------------
49 // Toolkit for building the common sorts of subgraphs.
50 // Does not know about bytecode parsing or type-flow results.
51 // It is able to create graphs implementing the semantics of most
52 // or all bytecodes, so that it can expand intrinsics and calls.
53 // It may depend on JVMState structure, but it must not depend
54 // on specific bytecode streams.
55 class GraphKit : public Phase {
56 friend class PreserveJVMState;
58 protected:
59 ciEnv* _env; // Compilation environment
60 PhaseGVN &_gvn; // Some optimizations while parsing
61 SafePointNode* _map; // Parser map from JVM to Nodes
62 SafePointNode* _exceptions;// Parser map(s) for exception state(s)
63 int _sp; // JVM Expression Stack Pointer
64 int _bci; // JVM Bytecode Pointer
65 ciMethod* _method; // JVM Current Method
67 private:
68 SafePointNode* map_not_null() const {
69 assert(_map != NULL, "must call stopped() to test for reset compiler map");
70 return _map;
71 }
73 public:
74 GraphKit(); // empty constructor
75 GraphKit(JVMState* jvms); // the JVM state on which to operate
77 #ifdef ASSERT
78 ~GraphKit() {
79 assert(!has_exceptions(), "user must call transfer_exceptions_into_jvms");
80 }
81 #endif
83 virtual Parse* is_Parse() const { return NULL; }
85 ciEnv* env() const { return _env; }
86 PhaseGVN& gvn() const { return _gvn; }
88 void record_for_igvn(Node* n) const { C->record_for_igvn(n); } // delegate to Compile
90 // Handy well-known nodes:
91 Node* null() const { return zerocon(T_OBJECT); }
92 Node* top() const { return C->top(); }
93 RootNode* root() const { return C->root(); }
95 // Create or find a constant node
96 Node* intcon(jint con) const { return _gvn.intcon(con); }
97 Node* longcon(jlong con) const { return _gvn.longcon(con); }
98 Node* makecon(const Type *t) const { return _gvn.makecon(t); }
99 Node* zerocon(BasicType bt) const { return _gvn.zerocon(bt); }
100 // (See also macro MakeConX in type.hpp, which uses intcon or longcon.)
102 // Helper for byte_map_base
103 Node* byte_map_base_node() {
104 // Get base of card map
105 CardTableModRefBS* ct = (CardTableModRefBS*)(Universe::heap()->barrier_set());
106 assert(sizeof(*ct->byte_map_base) == sizeof(jbyte), "adjust users of this code");
107 if (ct->byte_map_base != NULL) {
108 return makecon(TypeRawPtr::make((address)ct->byte_map_base));
109 } else {
110 return null();
111 }
112 }
114 jint find_int_con(Node* n, jint value_if_unknown) {
115 return _gvn.find_int_con(n, value_if_unknown);
116 }
117 jlong find_long_con(Node* n, jlong value_if_unknown) {
118 return _gvn.find_long_con(n, value_if_unknown);
119 }
120 // (See also macro find_intptr_t_con in type.hpp, which uses one of these.)
122 // JVM State accessors:
123 // Parser mapping from JVM indices into Nodes.
124 // Low slots are accessed by the StartNode::enum.
125 // Then come the locals at StartNode::Parms to StartNode::Parms+max_locals();
126 // Then come JVM stack slots.
127 // Finally come the monitors, if any.
128 // See layout accessors in class JVMState.
130 SafePointNode* map() const { return _map; }
131 bool has_exceptions() const { return _exceptions != NULL; }
132 JVMState* jvms() const { return map_not_null()->_jvms; }
133 int sp() const { return _sp; }
134 int bci() const { return _bci; }
135 Bytecodes::Code java_bc() const;
136 ciMethod* method() const { return _method; }
138 void set_jvms(JVMState* jvms) { set_map(jvms->map());
139 assert(jvms == this->jvms(), "sanity");
140 _sp = jvms->sp();
141 _bci = jvms->bci();
142 _method = jvms->has_method() ? jvms->method() : NULL; }
143 void set_map(SafePointNode* m) { _map = m; debug_only(verify_map()); }
144 void set_sp(int i) { assert(i >= 0, "must be non-negative"); _sp = i; }
145 void clean_stack(int from_sp); // clear garbage beyond from_sp to top
147 void inc_sp(int i) { set_sp(sp() + i); }
148 void set_bci(int bci) { _bci = bci; }
150 // Make sure jvms has current bci & sp.
151 JVMState* sync_jvms() const;
152 #ifdef ASSERT
153 // Make sure JVMS has an updated copy of bci and sp.
154 // Also sanity-check method, depth, and monitor depth.
155 bool jvms_in_sync() const;
157 // Make sure the map looks OK.
158 void verify_map() const;
160 // Make sure a proposed exception state looks OK.
161 static void verify_exception_state(SafePointNode* ex_map);
162 #endif
164 // Clone the existing map state. (Implements PreserveJVMState.)
165 SafePointNode* clone_map();
167 // Set the map to a clone of the given one.
168 void set_map_clone(SafePointNode* m);
170 // Tell if the compilation is failing.
171 bool failing() const { return C->failing(); }
173 // Set _map to NULL, signalling a stop to further bytecode execution.
174 // Preserve the map intact for future use, and return it back to the caller.
175 SafePointNode* stop() { SafePointNode* m = map(); set_map(NULL); return m; }
177 // Stop, but first smash the map's inputs to NULL, to mark it dead.
178 void stop_and_kill_map();
180 // Tell if _map is NULL, or control is top.
181 bool stopped();
183 // Tell if this method or any caller method has exception handlers.
184 bool has_ex_handler();
186 // Save an exception without blowing stack contents or other JVM state.
187 // (The extra pointer is stuck with add_req on the map, beyond the JVMS.)
188 static void set_saved_ex_oop(SafePointNode* ex_map, Node* ex_oop);
190 // Recover a saved exception from its map.
191 static Node* saved_ex_oop(SafePointNode* ex_map);
193 // Recover a saved exception from its map, and remove it from the map.
194 static Node* clear_saved_ex_oop(SafePointNode* ex_map);
196 #ifdef ASSERT
197 // Recover a saved exception from its map, and remove it from the map.
198 static bool has_saved_ex_oop(SafePointNode* ex_map);
199 #endif
201 // Push an exception in the canonical position for handlers (stack(0)).
202 void push_ex_oop(Node* ex_oop) {
203 ensure_stack(1); // ensure room to push the exception
204 set_stack(0, ex_oop);
205 set_sp(1);
206 clean_stack(1);
207 }
209 // Detach and return an exception state.
210 SafePointNode* pop_exception_state() {
211 SafePointNode* ex_map = _exceptions;
212 if (ex_map != NULL) {
213 _exceptions = ex_map->next_exception();
214 ex_map->set_next_exception(NULL);
215 debug_only(verify_exception_state(ex_map));
216 }
217 return ex_map;
218 }
220 // Add an exception, using the given JVM state, without commoning.
221 void push_exception_state(SafePointNode* ex_map) {
222 debug_only(verify_exception_state(ex_map));
223 ex_map->set_next_exception(_exceptions);
224 _exceptions = ex_map;
225 }
227 // Turn the current JVM state into an exception state, appending the ex_oop.
228 SafePointNode* make_exception_state(Node* ex_oop);
230 // Add an exception, using the given JVM state.
231 // Combine all exceptions with a common exception type into a single state.
232 // (This is done via combine_exception_states.)
233 void add_exception_state(SafePointNode* ex_map);
235 // Combine all exceptions of any sort whatever into a single master state.
236 SafePointNode* combine_and_pop_all_exception_states() {
237 if (_exceptions == NULL) return NULL;
238 SafePointNode* phi_map = pop_exception_state();
239 SafePointNode* ex_map;
240 while ((ex_map = pop_exception_state()) != NULL) {
241 combine_exception_states(ex_map, phi_map);
242 }
243 return phi_map;
244 }
246 // Combine the two exception states, building phis as necessary.
247 // The second argument is updated to include contributions from the first.
248 void combine_exception_states(SafePointNode* ex_map, SafePointNode* phi_map);
250 // Reset the map to the given state. If there are any half-finished phis
251 // in it (created by combine_exception_states), transform them now.
252 // Returns the exception oop. (Caller must call push_ex_oop if required.)
253 Node* use_exception_state(SafePointNode* ex_map);
255 // Collect exceptions from a given JVM state into my exception list.
256 void add_exception_states_from(JVMState* jvms);
258 // Collect all raised exceptions into the current JVM state.
259 // Clear the current exception list and map, returns the combined states.
260 JVMState* transfer_exceptions_into_jvms();
262 // Helper to throw a built-in exception.
263 // Range checks take the offending index.
264 // Cast and array store checks take the offending class.
265 // Others do not take the optional argument.
266 // The JVMS must allow the bytecode to be re-executed
267 // via an uncommon trap.
268 void builtin_throw(Deoptimization::DeoptReason reason, Node* arg = NULL);
270 // Helper to check the JavaThread::_should_post_on_exceptions flag
271 // and branch to an uncommon_trap if it is true (with the specified reason and must_throw)
272 void uncommon_trap_if_should_post_on_exceptions(Deoptimization::DeoptReason reason,
273 bool must_throw) ;
275 // Helper Functions for adding debug information
276 void kill_dead_locals();
277 #ifdef ASSERT
278 bool dead_locals_are_killed();
279 #endif
280 // The call may deoptimize. Supply required JVM state as debug info.
281 // If must_throw is true, the call is guaranteed not to return normally.
282 void add_safepoint_edges(SafePointNode* call,
283 bool must_throw = false);
285 // How many stack inputs does the current BC consume?
286 // And, how does the stack change after the bytecode?
287 // Returns false if unknown.
288 bool compute_stack_effects(int& inputs, int& depth);
290 // Add a fixed offset to a pointer
291 Node* basic_plus_adr(Node* base, Node* ptr, intptr_t offset) {
292 return basic_plus_adr(base, ptr, MakeConX(offset));
293 }
294 Node* basic_plus_adr(Node* base, intptr_t offset) {
295 return basic_plus_adr(base, base, MakeConX(offset));
296 }
297 // Add a variable offset to a pointer
298 Node* basic_plus_adr(Node* base, Node* offset) {
299 return basic_plus_adr(base, base, offset);
300 }
301 Node* basic_plus_adr(Node* base, Node* ptr, Node* offset);
304 // Some convenient shortcuts for common nodes
305 Node* IfTrue(IfNode* iff) { return _gvn.transform(new (C,1) IfTrueNode(iff)); }
306 Node* IfFalse(IfNode* iff) { return _gvn.transform(new (C,1) IfFalseNode(iff)); }
308 Node* AddI(Node* l, Node* r) { return _gvn.transform(new (C,3) AddINode(l, r)); }
309 Node* SubI(Node* l, Node* r) { return _gvn.transform(new (C,3) SubINode(l, r)); }
310 Node* MulI(Node* l, Node* r) { return _gvn.transform(new (C,3) MulINode(l, r)); }
311 Node* DivI(Node* ctl, Node* l, Node* r) { return _gvn.transform(new (C,3) DivINode(ctl, l, r)); }
313 Node* AndI(Node* l, Node* r) { return _gvn.transform(new (C,3) AndINode(l, r)); }
314 Node* OrI(Node* l, Node* r) { return _gvn.transform(new (C,3) OrINode(l, r)); }
315 Node* XorI(Node* l, Node* r) { return _gvn.transform(new (C,3) XorINode(l, r)); }
317 Node* MaxI(Node* l, Node* r) { return _gvn.transform(new (C,3) MaxINode(l, r)); }
318 Node* MinI(Node* l, Node* r) { return _gvn.transform(new (C,3) MinINode(l, r)); }
320 Node* LShiftI(Node* l, Node* r) { return _gvn.transform(new (C,3) LShiftINode(l, r)); }
321 Node* RShiftI(Node* l, Node* r) { return _gvn.transform(new (C,3) RShiftINode(l, r)); }
322 Node* URShiftI(Node* l, Node* r) { return _gvn.transform(new (C,3) URShiftINode(l, r)); }
324 Node* CmpI(Node* l, Node* r) { return _gvn.transform(new (C,3) CmpINode(l, r)); }
325 Node* CmpL(Node* l, Node* r) { return _gvn.transform(new (C,3) CmpLNode(l, r)); }
326 Node* CmpP(Node* l, Node* r) { return _gvn.transform(new (C,3) CmpPNode(l, r)); }
327 Node* Bool(Node* cmp, BoolTest::mask relop) { return _gvn.transform(new (C,2) BoolNode(cmp, relop)); }
329 Node* AddP(Node* b, Node* a, Node* o) { return _gvn.transform(new (C,4) AddPNode(b, a, o)); }
331 // Convert between int and long, and size_t.
332 // (See macros ConvI2X, etc., in type.hpp for ConvI2X, etc.)
333 Node* ConvI2L(Node* offset);
334 Node* ConvL2I(Node* offset);
335 // Find out the klass of an object.
336 Node* load_object_klass(Node* object);
337 // Find out the length of an array.
338 Node* load_array_length(Node* array);
339 // Helper function to do a NULL pointer check or ZERO check based on type.
340 Node* null_check_common(Node* value, BasicType type,
341 bool assert_null, Node* *null_control);
342 // Throw an exception if a given value is null.
343 // Return the value cast to not-null.
344 // Be clever about equivalent dominating null checks.
345 Node* do_null_check(Node* value, BasicType type) {
346 return null_check_common(value, type, false, NULL);
347 }
348 // Throw an uncommon trap if a given value is __not__ null.
349 // Return the value cast to null, and be clever about dominating checks.
350 Node* do_null_assert(Node* value, BasicType type) {
351 return null_check_common(value, type, true, NULL);
352 }
353 // Null check oop. Return null-path control into (*null_control).
354 // Return a cast-not-null node which depends on the not-null control.
355 // If never_see_null, use an uncommon trap (*null_control sees a top).
356 // The cast is not valid along the null path; keep a copy of the original.
357 Node* null_check_oop(Node* value, Node* *null_control,
358 bool never_see_null = false);
360 // Check the null_seen bit.
361 bool seems_never_null(Node* obj, ciProfileData* data);
363 // Use the type profile to narrow an object type.
364 Node* maybe_cast_profiled_receiver(Node* not_null_obj,
365 ciProfileData* data,
366 ciKlass* require_klass);
368 // Cast obj to not-null on this path
369 Node* cast_not_null(Node* obj, bool do_replace_in_map = true);
370 // Replace all occurrences of one node by another.
371 void replace_in_map(Node* old, Node* neww);
373 void push(Node* n) { map_not_null(); _map->set_stack(_map->_jvms,_sp++,n); }
374 Node* pop() { map_not_null(); return _map->stack(_map->_jvms,--_sp); }
375 Node* peek(int off=0) { map_not_null(); return _map->stack(_map->_jvms, _sp - off - 1); }
377 void push_pair(Node* ldval) {
378 push(ldval);
379 push(top()); // the halfword is merely a placeholder
380 }
381 void push_pair_local(int i) {
382 // longs are stored in locals in "push" order
383 push( local(i+0) ); // the real value
384 assert(local(i+1) == top(), "");
385 push(top()); // halfword placeholder
386 }
387 Node* pop_pair() {
388 // the second half is pushed last & popped first; it contains exactly nothing
389 Node* halfword = pop();
390 assert(halfword == top(), "");
391 // the long bits are pushed first & popped last:
392 return pop();
393 }
394 void set_pair_local(int i, Node* lval) {
395 // longs are stored in locals as a value/half pair (like doubles)
396 set_local(i+0, lval);
397 set_local(i+1, top());
398 }
400 // Push the node, which may be zero, one, or two words.
401 void push_node(BasicType n_type, Node* n) {
402 int n_size = type2size[n_type];
403 if (n_size == 1) push( n ); // T_INT, ...
404 else if (n_size == 2) push_pair( n ); // T_DOUBLE, T_LONG
405 else { assert(n_size == 0, "must be T_VOID"); }
406 }
408 Node* pop_node(BasicType n_type) {
409 int n_size = type2size[n_type];
410 if (n_size == 1) return pop();
411 else if (n_size == 2) return pop_pair();
412 else return NULL;
413 }
415 Node* control() const { return map_not_null()->control(); }
416 Node* i_o() const { return map_not_null()->i_o(); }
417 Node* returnadr() const { return map_not_null()->returnadr(); }
418 Node* frameptr() const { return map_not_null()->frameptr(); }
419 Node* local(uint idx) const { map_not_null(); return _map->local( _map->_jvms, idx); }
420 Node* stack(uint idx) const { map_not_null(); return _map->stack( _map->_jvms, idx); }
421 Node* argument(uint idx) const { map_not_null(); return _map->argument( _map->_jvms, idx); }
422 Node* monitor_box(uint idx) const { map_not_null(); return _map->monitor_box(_map->_jvms, idx); }
423 Node* monitor_obj(uint idx) const { map_not_null(); return _map->monitor_obj(_map->_jvms, idx); }
425 void set_control (Node* c) { map_not_null()->set_control(c); }
426 void set_i_o (Node* c) { map_not_null()->set_i_o(c); }
427 void set_local(uint idx, Node* c) { map_not_null(); _map->set_local( _map->_jvms, idx, c); }
428 void set_stack(uint idx, Node* c) { map_not_null(); _map->set_stack( _map->_jvms, idx, c); }
429 void set_argument(uint idx, Node* c){ map_not_null(); _map->set_argument(_map->_jvms, idx, c); }
430 void ensure_stack(uint stk_size) { map_not_null(); _map->ensure_stack(_map->_jvms, stk_size); }
432 // Access unaliased memory
433 Node* memory(uint alias_idx);
434 Node* memory(const TypePtr *tp) { return memory(C->get_alias_index(tp)); }
435 Node* memory(Node* adr) { return memory(_gvn.type(adr)->is_ptr()); }
437 // Access immutable memory
438 Node* immutable_memory() { return C->immutable_memory(); }
440 // Set unaliased memory
441 void set_memory(Node* c, uint alias_idx) { merged_memory()->set_memory_at(alias_idx, c); }
442 void set_memory(Node* c, const TypePtr *tp) { set_memory(c,C->get_alias_index(tp)); }
443 void set_memory(Node* c, Node* adr) { set_memory(c,_gvn.type(adr)->is_ptr()); }
445 // Get the entire memory state (probably a MergeMemNode), and reset it
446 // (The resetting prevents somebody from using the dangling Node pointer.)
447 Node* reset_memory();
449 // Get the entire memory state, asserted to be a MergeMemNode.
450 MergeMemNode* merged_memory() {
451 Node* mem = map_not_null()->memory();
452 assert(mem->is_MergeMem(), "parse memory is always pre-split");
453 return mem->as_MergeMem();
454 }
456 // Set the entire memory state; produce a new MergeMemNode.
457 void set_all_memory(Node* newmem);
459 // Create a memory projection from the call, then set_all_memory.
460 void set_all_memory_call(Node* call, bool separate_io_proj = false);
462 // Create a LoadNode, reading from the parser's memory state.
463 // (Note: require_atomic_access is useful only with T_LONG.)
464 Node* make_load(Node* ctl, Node* adr, const Type* t, BasicType bt,
465 bool require_atomic_access = false) {
466 // This version computes alias_index from bottom_type
467 return make_load(ctl, adr, t, bt, adr->bottom_type()->is_ptr(),
468 require_atomic_access);
469 }
470 Node* make_load(Node* ctl, Node* adr, const Type* t, BasicType bt, const TypePtr* adr_type, bool require_atomic_access = false) {
471 // This version computes alias_index from an address type
472 assert(adr_type != NULL, "use other make_load factory");
473 return make_load(ctl, adr, t, bt, C->get_alias_index(adr_type),
474 require_atomic_access);
475 }
476 // This is the base version which is given an alias index.
477 Node* make_load(Node* ctl, Node* adr, const Type* t, BasicType bt, int adr_idx, bool require_atomic_access = false);
479 // Create & transform a StoreNode and store the effect into the
480 // parser's memory state.
481 Node* store_to_memory(Node* ctl, Node* adr, Node* val, BasicType bt,
482 const TypePtr* adr_type,
483 bool require_atomic_access = false) {
484 // This version computes alias_index from an address type
485 assert(adr_type != NULL, "use other store_to_memory factory");
486 return store_to_memory(ctl, adr, val, bt,
487 C->get_alias_index(adr_type),
488 require_atomic_access);
489 }
490 // This is the base version which is given alias index
491 // Return the new StoreXNode
492 Node* store_to_memory(Node* ctl, Node* adr, Node* val, BasicType bt,
493 int adr_idx,
494 bool require_atomic_access = false);
497 // All in one pre-barrier, store, post_barrier
498 // Insert a write-barrier'd store. This is to let generational GC
499 // work; we have to flag all oop-stores before the next GC point.
500 //
501 // It comes in 3 flavors of store to an object, array, or unknown.
502 // We use precise card marks for arrays to avoid scanning the entire
503 // array. We use imprecise for object. We use precise for unknown
504 // since we don't know if we have an array or and object or even
505 // where the object starts.
506 //
507 // If val==NULL, it is taken to be a completely unknown value. QQQ
509 Node* store_oop(Node* ctl,
510 Node* obj, // containing obj
511 Node* adr, // actual adress to store val at
512 const TypePtr* adr_type,
513 Node* val,
514 const TypeOopPtr* val_type,
515 BasicType bt,
516 bool use_precise);
518 Node* store_oop_to_object(Node* ctl,
519 Node* obj, // containing obj
520 Node* adr, // actual adress to store val at
521 const TypePtr* adr_type,
522 Node* val,
523 const TypeOopPtr* val_type,
524 BasicType bt) {
525 return store_oop(ctl, obj, adr, adr_type, val, val_type, bt, false);
526 }
528 Node* store_oop_to_array(Node* ctl,
529 Node* obj, // containing obj
530 Node* adr, // actual adress to store val at
531 const TypePtr* adr_type,
532 Node* val,
533 const TypeOopPtr* val_type,
534 BasicType bt) {
535 return store_oop(ctl, obj, adr, adr_type, val, val_type, bt, true);
536 }
538 // Could be an array or object we don't know at compile time (unsafe ref.)
539 Node* store_oop_to_unknown(Node* ctl,
540 Node* obj, // containing obj
541 Node* adr, // actual adress to store val at
542 const TypePtr* adr_type,
543 Node* val,
544 BasicType bt);
546 // For the few case where the barriers need special help
547 void pre_barrier(bool do_load, Node* ctl,
548 Node* obj, Node* adr, uint adr_idx, Node* val, const TypeOopPtr* val_type,
549 Node* pre_val,
550 BasicType bt);
552 void post_barrier(Node* ctl, Node* store, Node* obj, Node* adr, uint adr_idx,
553 Node* val, BasicType bt, bool use_precise);
555 // Return addressing for an array element.
556 Node* array_element_address(Node* ary, Node* idx, BasicType elembt,
557 // Optional constraint on the array size:
558 const TypeInt* sizetype = NULL);
560 // Return a load of array element at idx.
561 Node* load_array_element(Node* ctl, Node* ary, Node* idx, const TypeAryPtr* arytype);
563 //---------------- Dtrace support --------------------
564 void make_dtrace_method_entry_exit(ciMethod* method, bool is_entry);
565 void make_dtrace_method_entry(ciMethod* method) {
566 make_dtrace_method_entry_exit(method, true);
567 }
568 void make_dtrace_method_exit(ciMethod* method) {
569 make_dtrace_method_entry_exit(method, false);
570 }
572 //--------------- stub generation -------------------
573 public:
574 void gen_stub(address C_function,
575 const char *name,
576 int is_fancy_jump,
577 bool pass_tls,
578 bool return_pc);
580 //---------- help for generating calls --------------
582 // Do a null check on the receiver, which is in argument(0).
583 Node* null_check_receiver(ciMethod* callee) {
584 assert(!callee->is_static(), "must be a virtual method");
585 int nargs = 1 + callee->signature()->size();
586 // Null check on self without removing any arguments. The argument
587 // null check technically happens in the wrong place, which can lead to
588 // invalid stack traces when the primitive is inlined into a method
589 // which handles NullPointerExceptions.
590 Node* receiver = argument(0);
591 _sp += nargs;
592 receiver = do_null_check(receiver, T_OBJECT);
593 _sp -= nargs;
594 return receiver;
595 }
597 // Fill in argument edges for the call from argument(0), argument(1), ...
598 // (The next step is to call set_edges_for_java_call.)
599 void set_arguments_for_java_call(CallJavaNode* call);
601 // Fill in non-argument edges for the call.
602 // Transform the call, and update the basics: control, i_o, memory.
603 // (The next step is usually to call set_results_for_java_call.)
604 void set_edges_for_java_call(CallJavaNode* call,
605 bool must_throw = false, bool separate_io_proj = false);
607 // Finish up a java call that was started by set_edges_for_java_call.
608 // Call add_exception on any throw arising from the call.
609 // Return the call result (transformed).
610 Node* set_results_for_java_call(CallJavaNode* call, bool separate_io_proj = false);
612 // Similar to set_edges_for_java_call, but simplified for runtime calls.
613 void set_predefined_output_for_runtime_call(Node* call) {
614 set_predefined_output_for_runtime_call(call, NULL, NULL);
615 }
616 void set_predefined_output_for_runtime_call(Node* call,
617 Node* keep_mem,
618 const TypePtr* hook_mem);
619 Node* set_predefined_input_for_runtime_call(SafePointNode* call);
621 // Replace the call with the current state of the kit. Requires
622 // that the call was generated with separate io_projs so that
623 // exceptional control flow can be handled properly.
624 void replace_call(CallNode* call, Node* result);
626 // helper functions for statistics
627 void increment_counter(address counter_addr); // increment a debug counter
628 void increment_counter(Node* counter_addr); // increment a debug counter
630 // Bail out to the interpreter right now
631 // The optional klass is the one causing the trap.
632 // The optional reason is debug information written to the compile log.
633 // Optional must_throw is the same as with add_safepoint_edges.
634 void uncommon_trap(int trap_request,
635 ciKlass* klass = NULL, const char* reason_string = NULL,
636 bool must_throw = false, bool keep_exact_action = false);
638 // Shorthand, to avoid saying "Deoptimization::" so many times.
639 void uncommon_trap(Deoptimization::DeoptReason reason,
640 Deoptimization::DeoptAction action,
641 ciKlass* klass = NULL, const char* reason_string = NULL,
642 bool must_throw = false, bool keep_exact_action = false) {
643 uncommon_trap(Deoptimization::make_trap_request(reason, action),
644 klass, reason_string, must_throw, keep_exact_action);
645 }
647 // Report if there were too many traps at the current method and bci.
648 // Report if a trap was recorded, and/or PerMethodTrapLimit was exceeded.
649 // If there is no MDO at all, report no trap unless told to assume it.
650 bool too_many_traps(Deoptimization::DeoptReason reason) {
651 return C->too_many_traps(method(), bci(), reason);
652 }
654 // Report if there were too many recompiles at the current method and bci.
655 bool too_many_recompiles(Deoptimization::DeoptReason reason) {
656 return C->too_many_recompiles(method(), bci(), reason);
657 }
659 // Returns the object (if any) which was created the moment before.
660 Node* just_allocated_object(Node* current_control);
662 static bool use_ReduceInitialCardMarks() {
663 return (ReduceInitialCardMarks
664 && Universe::heap()->can_elide_tlab_store_barriers());
665 }
667 // Sync Ideal and Graph kits.
668 void sync_kit(IdealKit& ideal);
669 void final_sync(IdealKit& ideal);
671 // vanilla/CMS post barrier
672 void write_barrier_post(Node *store, Node* obj,
673 Node* adr, uint adr_idx, Node* val, bool use_precise);
675 // G1 pre/post barriers
676 void g1_write_barrier_pre(bool do_load,
677 Node* obj,
678 Node* adr,
679 uint alias_idx,
680 Node* val,
681 const TypeOopPtr* val_type,
682 Node* pre_val,
683 BasicType bt);
685 void g1_write_barrier_post(Node* store,
686 Node* obj,
687 Node* adr,
688 uint alias_idx,
689 Node* val,
690 BasicType bt,
691 bool use_precise);
692 // Helper function for g1
693 private:
694 void g1_mark_card(IdealKit& ideal, Node* card_adr, Node* store, uint oop_alias_idx,
695 Node* index, Node* index_adr,
696 Node* buffer, const TypeFunc* tf);
698 public:
699 // Helper function to round double arguments before a call
700 void round_double_arguments(ciMethod* dest_method);
701 void round_double_result(ciMethod* dest_method);
703 // rounding for strict float precision conformance
704 Node* precision_rounding(Node* n);
706 // rounding for strict double precision conformance
707 Node* dprecision_rounding(Node* n);
709 // rounding for non-strict double stores
710 Node* dstore_rounding(Node* n);
712 // Helper functions for fast/slow path codes
713 Node* opt_iff(Node* region, Node* iff);
714 Node* make_runtime_call(int flags,
715 const TypeFunc* call_type, address call_addr,
716 const char* call_name,
717 const TypePtr* adr_type, // NULL if no memory effects
718 Node* parm0 = NULL, Node* parm1 = NULL,
719 Node* parm2 = NULL, Node* parm3 = NULL,
720 Node* parm4 = NULL, Node* parm5 = NULL,
721 Node* parm6 = NULL, Node* parm7 = NULL);
722 enum { // flag values for make_runtime_call
723 RC_NO_FP = 1, // CallLeafNoFPNode
724 RC_NO_IO = 2, // do not hook IO edges
725 RC_NO_LEAF = 4, // CallStaticJavaNode
726 RC_MUST_THROW = 8, // flag passed to add_safepoint_edges
727 RC_NARROW_MEM = 16, // input memory is same as output
728 RC_UNCOMMON = 32, // freq. expected to be like uncommon trap
729 RC_LEAF = 0 // null value: no flags set
730 };
732 // merge in all memory slices from new_mem, along the given path
733 void merge_memory(Node* new_mem, Node* region, int new_path);
734 void make_slow_call_ex(Node* call, ciInstanceKlass* ex_klass, bool separate_io_proj);
736 // Helper functions to build synchronizations
737 int next_monitor();
738 Node* insert_mem_bar(int opcode, Node* precedent = NULL);
739 Node* insert_mem_bar_volatile(int opcode, int alias_idx, Node* precedent = NULL);
740 // Optional 'precedent' is appended as an extra edge, to force ordering.
741 FastLockNode* shared_lock(Node* obj);
742 void shared_unlock(Node* box, Node* obj);
744 // helper functions for the fast path/slow path idioms
745 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);
747 // Generate an instance-of idiom. Used by both the instance-of bytecode
748 // and the reflective instance-of call.
749 Node* gen_instanceof( Node *subobj, Node* superkls );
751 // Generate a check-cast idiom. Used by both the check-cast bytecode
752 // and the array-store bytecode
753 Node* gen_checkcast( Node *subobj, Node* superkls,
754 Node* *failure_control = NULL );
756 // Generate a subtyping check. Takes as input the subtype and supertype.
757 // Returns 2 values: sets the default control() to the true path and
758 // returns the false path. Only reads from constant memory taken from the
759 // default memory; does not write anything. It also doesn't take in an
760 // Object; if you wish to check an Object you need to load the Object's
761 // class prior to coming here.
762 Node* gen_subtype_check(Node* subklass, Node* superklass);
764 // Static parse-time type checking logic for gen_subtype_check:
765 enum { SSC_always_false, SSC_always_true, SSC_easy_test, SSC_full_test };
766 int static_subtype_check(ciKlass* superk, ciKlass* subk);
768 // Exact type check used for predicted calls and casts.
769 // Rewrites (*casted_receiver) to be casted to the stronger type.
770 // (Caller is responsible for doing replace_in_map.)
771 Node* type_check_receiver(Node* receiver, ciKlass* klass, float prob,
772 Node* *casted_receiver);
774 // implementation of object creation
775 Node* set_output_for_allocation(AllocateNode* alloc,
776 const TypeOopPtr* oop_type);
777 Node* get_layout_helper(Node* klass_node, jint& constant_value);
778 Node* new_instance(Node* klass_node,
779 Node* slow_test = NULL,
780 Node* *return_size_val = NULL);
781 Node* new_array(Node* klass_node, Node* count_val, int nargs,
782 Node* *return_size_val = NULL);
784 // Handy for making control flow
785 IfNode* create_and_map_if(Node* ctrl, Node* tst, float prob, float cnt) {
786 IfNode* iff = new (C, 2) IfNode(ctrl, tst, prob, cnt);// New IfNode's
787 _gvn.set_type(iff, iff->Value(&_gvn)); // Value may be known at parse-time
788 // Place 'if' on worklist if it will be in graph
789 if (!tst->is_Con()) record_for_igvn(iff); // Range-check and Null-check removal is later
790 return iff;
791 }
793 IfNode* create_and_xform_if(Node* ctrl, Node* tst, float prob, float cnt) {
794 IfNode* iff = new (C, 2) IfNode(ctrl, tst, prob, cnt);// New IfNode's
795 _gvn.transform(iff); // Value may be known at parse-time
796 // Place 'if' on worklist if it will be in graph
797 if (!tst->is_Con()) record_for_igvn(iff); // Range-check and Null-check removal is later
798 return iff;
799 }
801 // Insert a loop predicate into the graph
802 void add_predicate(int nargs = 0);
803 void add_predicate_impl(Deoptimization::DeoptReason reason, int nargs);
804 };
806 // Helper class to support building of control flow branches. Upon
807 // creation the map and sp at bci are cloned and restored upon de-
808 // struction. Typical use:
809 //
810 // { PreserveJVMState pjvms(this);
811 // // code of new branch
812 // }
813 // // here the JVM state at bci is established
815 class PreserveJVMState: public StackObj {
816 protected:
817 GraphKit* _kit;
818 #ifdef ASSERT
819 int _block; // PO of current block, if a Parse
820 int _bci;
821 #endif
822 SafePointNode* _map;
823 uint _sp;
825 public:
826 PreserveJVMState(GraphKit* kit, bool clone_map = true);
827 ~PreserveJVMState();
828 };
830 // Helper class to build cutouts of the form if (p) ; else {x...}.
831 // The code {x...} must not fall through.
832 // The kit's main flow of control is set to the "then" continuation of if(p).
833 class BuildCutout: public PreserveJVMState {
834 public:
835 BuildCutout(GraphKit* kit, Node* p, float prob, float cnt = COUNT_UNKNOWN);
836 ~BuildCutout();
837 };
839 // Helper class to preserve the original _reexecute bit and _sp and restore
840 // them back
841 class PreserveReexecuteState: public StackObj {
842 protected:
843 GraphKit* _kit;
844 uint _sp;
845 JVMState::ReexecuteState _reexecute;
847 public:
848 PreserveReexecuteState(GraphKit* kit);
849 ~PreserveReexecuteState();
850 };
852 #endif // SHARE_VM_OPTO_GRAPHKIT_HPP