jdk8-mips64-public/hotspot: src/share/vm/opto/graphKit.hpp@7c57aead6d3e (annotated)

src/share/vm/opto/graphKit.hpp@7c57aead6d3e (annotated)

src/share/vm/opto/graphKit.hpp

Thu, 12 Nov 2009 09:24:21 -0800

author: never
date: Thu, 12 Nov 2009 09:24:21 -0800
changeset 1515: 7c57aead6d3e
parent 1420: 685e959d09ea
child 1648: 6deeaebad47a
permissions: -rw-r--r--

6892658: C2 should optimize some stringbuilder patterns
Reviewed-by: kvn, twisti

 /*
  * Copyright 2001-2009 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  *
  */
 class FastLockNode;
 class FastUnlockNode;
 class IdealKit;
 class Parse;
 class RootNode;
 //-----------------------------------------------------------------------------
 //----------------------------GraphKit-----------------------------------------
 // Toolkit for building the common sorts of subgraphs.
 // Does not know about bytecode parsing or type-flow results.
 // It is able to create graphs implementing the semantics of most
 // or all bytecodes, so that it can expand intrinsics and calls.
 // It may depend on JVMState structure, but it must not depend
 // on specific bytecode streams.
 class GraphKit : public Phase {
   friend class PreserveJVMState;
  protected:
   ciEnv*            _env;       // Compilation environment
   PhaseGVN         &_gvn;       // Some optimizations while parsing
   SafePointNode*    _map;       // Parser map from JVM to Nodes
   SafePointNode*    _exceptions;// Parser map(s) for exception state(s)
   int               _sp;        // JVM Expression Stack Pointer
   int               _bci;       // JVM Bytecode Pointer
   ciMethod*         _method;    // JVM Current Method
  private:
   SafePointNode*     map_not_null() const {
     assert(_map != NULL, "must call stopped() to test for reset compiler map");
     return _map;
   }
  public:
   GraphKit();                   // empty constructor
   GraphKit(JVMState* jvms);     // the JVM state on which to operate
 #ifdef ASSERT
   ~GraphKit() {
     assert(!has_exceptions(), "user must call transfer_exceptions_into_jvms");
   }
 #endif
   virtual Parse* is_Parse() const { return NULL; }
   ciEnv*        env()           const { return _env; }
   PhaseGVN&     gvn()           const { return _gvn; }
   void record_for_igvn(Node* n) const { C->record_for_igvn(n); }  // delegate to Compile
   // Handy well-known nodes:
   Node*         null()          const { return zerocon(T_OBJECT); }
   Node*         top()           const { return C->top(); }
   RootNode*     root()          const { return C->root(); }
   // Create or find a constant node
   Node* intcon(jint con)        const { return _gvn.intcon(con); }
   Node* longcon(jlong con)      const { return _gvn.longcon(con); }
   Node* makecon(const Type *t)  const { return _gvn.makecon(t); }
   Node* zerocon(BasicType bt)   const { return _gvn.zerocon(bt); }
   // (See also macro MakeConX in type.hpp, which uses intcon or longcon.)
   // Helper for byte_map_base
   Node* byte_map_base_node() {
     // Get base of card map
     CardTableModRefBS* ct = (CardTableModRefBS*)(Universe::heap()->barrier_set());
     assert(sizeof(*ct->byte_map_base) == sizeof(jbyte), "adjust users of this code");
     if (ct->byte_map_base != NULL) {
       return makecon(TypeRawPtr::make((address)ct->byte_map_base));
     } else {
       return null();
     }
   }
   jint  find_int_con(Node* n, jint value_if_unknown) {
     return _gvn.find_int_con(n, value_if_unknown);
   }
   jlong find_long_con(Node* n, jlong value_if_unknown) {
     return _gvn.find_long_con(n, value_if_unknown);
   }
   // (See also macro find_intptr_t_con in type.hpp, which uses one of these.)
   // JVM State accessors:
   // Parser mapping from JVM indices into Nodes.
   // Low slots are accessed by the StartNode::enum.
   // Then come the locals at StartNode::Parms to StartNode::Parms+max_locals();
   // Then come JVM stack slots.
   // Finally come the monitors, if any.
   // See layout accessors in class JVMState.
   SafePointNode*     map()      const { return _map; }
   bool               has_exceptions() const { return _exceptions != NULL; }
   JVMState*          jvms()     const { return map_not_null()->_jvms; }
   int                sp()       const { return _sp; }
   int                bci()      const { return _bci; }
   Bytecodes::Code    java_bc()  const;
   ciMethod*          method()   const { return _method; }
   void set_jvms(JVMState* jvms)       { set_map(jvms->map());
                                         assert(jvms == this->jvms(), "sanity");
                                         _sp = jvms->sp();
                                         _bci = jvms->bci();
                                         _method = jvms->has_method() ? jvms->method() : NULL; }
   void set_map(SafePointNode* m)      { _map = m; debug_only(verify_map()); }
   void set_sp(int i)                  { assert(i >= 0, "must be non-negative"); _sp = i; }
   void clean_stack(int from_sp); // clear garbage beyond from_sp to top
   void inc_sp(int i)                  { set_sp(sp() + i); }
   void set_bci(int bci)               { _bci = bci; }
   // Make sure jvms has current bci & sp.
   JVMState* sync_jvms()     const;
 #ifdef ASSERT
   // Make sure JVMS has an updated copy of bci and sp.
   // Also sanity-check method, depth, and monitor depth.
   bool jvms_in_sync() const;
   // Make sure the map looks OK.
   void verify_map() const;
   // Make sure a proposed exception state looks OK.
   static void verify_exception_state(SafePointNode* ex_map);
 #endif
   // Clone the existing map state.  (Implements PreserveJVMState.)
   SafePointNode* clone_map();
   // Set the map to a clone of the given one.
   void set_map_clone(SafePointNode* m);
   // Tell if the compilation is failing.
   bool failing() const { return C->failing(); }
   // Set _map to NULL, signalling a stop to further bytecode execution.
   // Preserve the map intact for future use, and return it back to the caller.
   SafePointNode* stop() { SafePointNode* m = map(); set_map(NULL); return m; }
   // Stop, but first smash the map's inputs to NULL, to mark it dead.
   void stop_and_kill_map();
   // Tell if _map is NULL, or control is top.
   bool stopped();
   // Tell if this method or any caller method has exception handlers.
   bool has_ex_handler();
   // Save an exception without blowing stack contents or other JVM state.
   // (The extra pointer is stuck with add_req on the map, beyond the JVMS.)
   static void set_saved_ex_oop(SafePointNode* ex_map, Node* ex_oop);
   // Recover a saved exception from its map.
   static Node* saved_ex_oop(SafePointNode* ex_map);
   // Recover a saved exception from its map, and remove it from the map.
   static Node* clear_saved_ex_oop(SafePointNode* ex_map);
 #ifdef ASSERT
   // Recover a saved exception from its map, and remove it from the map.
   static bool has_saved_ex_oop(SafePointNode* ex_map);
 #endif
   // Push an exception in the canonical position for handlers (stack(0)).
   void push_ex_oop(Node* ex_oop) {
     ensure_stack(1);  // ensure room to push the exception
     set_stack(0, ex_oop);
     set_sp(1);
     clean_stack(1);
   }
   // Detach and return an exception state.
   SafePointNode* pop_exception_state() {
     SafePointNode* ex_map = _exceptions;
     if (ex_map != NULL) {
       _exceptions = ex_map->next_exception();
       ex_map->set_next_exception(NULL);
       debug_only(verify_exception_state(ex_map));
     }
     return ex_map;
   }
   // Add an exception, using the given JVM state, without commoning.
   void push_exception_state(SafePointNode* ex_map) {
     debug_only(verify_exception_state(ex_map));
     ex_map->set_next_exception(_exceptions);
     _exceptions = ex_map;
   }
   // Turn the current JVM state into an exception state, appending the ex_oop.
   SafePointNode* make_exception_state(Node* ex_oop);
   // Add an exception, using the given JVM state.
   // Combine all exceptions with a common exception type into a single state.
   // (This is done via combine_exception_states.)
   void add_exception_state(SafePointNode* ex_map);
   // Combine all exceptions of any sort whatever into a single master state.
   SafePointNode* combine_and_pop_all_exception_states() {
     if (_exceptions == NULL)  return NULL;
     SafePointNode* phi_map = pop_exception_state();
     SafePointNode* ex_map;
     while ((ex_map = pop_exception_state()) != NULL) {
       combine_exception_states(ex_map, phi_map);
     }
     return phi_map;
   }
   // Combine the two exception states, building phis as necessary.
   // The second argument is updated to include contributions from the first.
   void combine_exception_states(SafePointNode* ex_map, SafePointNode* phi_map);
   // Reset the map to the given state.  If there are any half-finished phis
   // in it (created by combine_exception_states), transform them now.
   // Returns the exception oop.  (Caller must call push_ex_oop if required.)
   Node* use_exception_state(SafePointNode* ex_map);
   // Collect exceptions from a given JVM state into my exception list.
   void add_exception_states_from(JVMState* jvms);
   // Collect all raised exceptions into the current JVM state.
   // Clear the current exception list and map, returns the combined states.
   JVMState* transfer_exceptions_into_jvms();
   // Helper to throw a built-in exception.
   // Range checks take the offending index.
   // Cast and array store checks take the offending class.
   // Others do not take the optional argument.
   // The JVMS must allow the bytecode to be re-executed
   // via an uncommon trap.
   void builtin_throw(Deoptimization::DeoptReason reason, Node* arg = NULL);
   // Helper Functions for adding debug information
   void kill_dead_locals();
 #ifdef ASSERT
   bool dead_locals_are_killed();
 #endif
   // The call may deoptimize.  Supply required JVM state as debug info.
   // If must_throw is true, the call is guaranteed not to return normally.
   void add_safepoint_edges(SafePointNode* call,
                            bool must_throw = false);
   // How many stack inputs does the current BC consume?
   // And, how does the stack change after the bytecode?
   // Returns false if unknown.
   bool compute_stack_effects(int& inputs, int& depth);
   // Add a fixed offset to a pointer
   Node* basic_plus_adr(Node* base, Node* ptr, intptr_t offset) {
     return basic_plus_adr(base, ptr, MakeConX(offset));
   }
   Node* basic_plus_adr(Node* base, intptr_t offset) {
     return basic_plus_adr(base, base, MakeConX(offset));
   }
   // Add a variable offset to a pointer
   Node* basic_plus_adr(Node* base, Node* offset) {
     return basic_plus_adr(base, base, offset);
   }
   Node* basic_plus_adr(Node* base, Node* ptr, Node* offset);
   // Some convenient shortcuts for common nodes
   Node* IfTrue(IfNode* iff)                   { return _gvn.transform(new (C,1) IfTrueNode(iff));      }
   Node* IfFalse(IfNode* iff)                  { return _gvn.transform(new (C,1) IfFalseNode(iff));     }
   Node* AddI(Node* l, Node* r)                { return _gvn.transform(new (C,3) AddINode(l, r));       }
   Node* SubI(Node* l, Node* r)                { return _gvn.transform(new (C,3) SubINode(l, r));       }
   Node* MulI(Node* l, Node* r)                { return _gvn.transform(new (C,3) MulINode(l, r));       }
   Node* DivI(Node* ctl, Node* l, Node* r)     { return _gvn.transform(new (C,3) DivINode(ctl, l, r));  }
   Node* AndI(Node* l, Node* r)                { return _gvn.transform(new (C,3) AndINode(l, r));       }
   Node* OrI(Node* l, Node* r)                 { return _gvn.transform(new (C,3) OrINode(l, r));        }
   Node* XorI(Node* l, Node* r)                { return _gvn.transform(new (C,3) XorINode(l, r));       }
   Node* MaxI(Node* l, Node* r)                { return _gvn.transform(new (C,3) MaxINode(l, r));       }
   Node* MinI(Node* l, Node* r)                { return _gvn.transform(new (C,3) MinINode(l, r));       }
   Node* LShiftI(Node* l, Node* r)             { return _gvn.transform(new (C,3) LShiftINode(l, r));    }
   Node* RShiftI(Node* l, Node* r)             { return _gvn.transform(new (C,3) RShiftINode(l, r));    }
   Node* URShiftI(Node* l, Node* r)            { return _gvn.transform(new (C,3) URShiftINode(l, r));   }
   Node* CmpI(Node* l, Node* r)                { return _gvn.transform(new (C,3) CmpINode(l, r));       }
   Node* CmpL(Node* l, Node* r)                { return _gvn.transform(new (C,3) CmpLNode(l, r));       }
   Node* CmpP(Node* l, Node* r)                { return _gvn.transform(new (C,3) CmpPNode(l, r));       }
   Node* Bool(Node* cmp, BoolTest::mask relop) { return _gvn.transform(new (C,2) BoolNode(cmp, relop)); }
   Node* AddP(Node* b, Node* a, Node* o)       { return _gvn.transform(new (C,4) AddPNode(b, a, o));    }
   // Convert between int and long, and size_t.
   // (See macros ConvI2X, etc., in type.hpp for ConvI2X, etc.)
   Node* ConvI2L(Node* offset);
   Node* ConvL2I(Node* offset);
   // Find out the klass of an object.
   Node* load_object_klass(Node* object);
   // Find out the length of an array.
   Node* load_array_length(Node* array);
   // Helper function to do a NULL pointer check or ZERO check based on type.
   Node* null_check_common(Node* value, BasicType type,
                           bool assert_null, Node* *null_control);
   // Throw an exception if a given value is null.
   // Return the value cast to not-null.
   // Be clever about equivalent dominating null checks.
   Node* do_null_check(Node* value, BasicType type) {
     return null_check_common(value, type, false, NULL);
   }
   // Throw an uncommon trap if a given value is __not__ null.
   // Return the value cast to null, and be clever about dominating checks.
   Node* do_null_assert(Node* value, BasicType type) {
     return null_check_common(value, type, true, NULL);
   }
   // Null check oop.  Return null-path control into (*null_control).
   // Return a cast-not-null node which depends on the not-null control.
   // If never_see_null, use an uncommon trap (*null_control sees a top).
   // The cast is not valid along the null path; keep a copy of the original.
   Node* null_check_oop(Node* value, Node* *null_control,
                        bool never_see_null = false);
   // Cast obj to not-null on this path
   Node* cast_not_null(Node* obj, bool do_replace_in_map = true);
   // Replace all occurrences of one node by another.
   void replace_in_map(Node* old, Node* neww);
   void push(Node* n)    { map_not_null(); _map->set_stack(_map->_jvms,_sp++,n); }
   Node* pop()           { map_not_null(); return _map->stack(_map->_jvms,--_sp); }
   Node* peek(int off=0) { map_not_null(); return _map->stack(_map->_jvms, _sp - off - 1); }
   void push_pair(Node* ldval) {
     push(ldval);
     push(top());  // the halfword is merely a placeholder
   }
   void push_pair_local(int i) {
     // longs are stored in locals in "push" order
     push(  local(i+0) );  // the real value
     assert(local(i+1) == top(), "");
     push(top());  // halfword placeholder
   }
   Node* pop_pair() {
     // the second half is pushed last & popped first; it contains exactly nothing
     Node* halfword = pop();
     assert(halfword == top(), "");
     // the long bits are pushed first & popped last:
     return pop();
   }
   void set_pair_local(int i, Node* lval) {
     // longs are stored in locals as a value/half pair (like doubles)
     set_local(i+0, lval);
     set_local(i+1, top());
   }
   // Push the node, which may be zero, one, or two words.
   void push_node(BasicType n_type, Node* n) {
     int n_size = type2size[n_type];
     if      (n_size == 1)  push(      n );  // T_INT, ...
     else if (n_size == 2)  push_pair( n );  // T_DOUBLE, T_LONG
     else                   { assert(n_size == 0, "must be T_VOID"); }
   }
   Node* pop_node(BasicType n_type) {
     int n_size = type2size[n_type];
     if      (n_size == 1)  return pop();
     else if (n_size == 2)  return pop_pair();
     else                   return NULL;
   }
   Node* control()               const { return map_not_null()->control(); }
   Node* i_o()                   const { return map_not_null()->i_o(); }
   Node* returnadr()             const { return map_not_null()->returnadr(); }
   Node* frameptr()              const { return map_not_null()->frameptr(); }
   Node* local(uint idx)         const { map_not_null(); return _map->local(      _map->_jvms, idx); }
   Node* stack(uint idx)         const { map_not_null(); return _map->stack(      _map->_jvms, idx); }
   Node* argument(uint idx)      const { map_not_null(); return _map->argument(   _map->_jvms, idx); }
   Node* monitor_box(uint idx)   const { map_not_null(); return _map->monitor_box(_map->_jvms, idx); }
   Node* monitor_obj(uint idx)   const { map_not_null(); return _map->monitor_obj(_map->_jvms, idx); }
   void set_control  (Node* c)         { map_not_null()->set_control(c); }
   void set_i_o      (Node* c)         { map_not_null()->set_i_o(c); }
   void set_local(uint idx, Node* c)   { map_not_null(); _map->set_local(   _map->_jvms, idx, c); }
   void set_stack(uint idx, Node* c)   { map_not_null(); _map->set_stack(   _map->_jvms, idx, c); }
   void set_argument(uint idx, Node* c){ map_not_null(); _map->set_argument(_map->_jvms, idx, c); }
   void ensure_stack(uint stk_size)    { map_not_null(); _map->ensure_stack(_map->_jvms, stk_size); }
   // Access unaliased memory
   Node* memory(uint alias_idx);
   Node* memory(const TypePtr *tp) { return memory(C->get_alias_index(tp)); }
   Node* memory(Node* adr) { return memory(_gvn.type(adr)->is_ptr()); }
   // Access immutable memory
   Node* immutable_memory() { return C->immutable_memory(); }
   // Set unaliased memory
   void set_memory(Node* c, uint alias_idx) { merged_memory()->set_memory_at(alias_idx, c); }
   void set_memory(Node* c, const TypePtr *tp) { set_memory(c,C->get_alias_index(tp)); }
   void set_memory(Node* c, Node* adr) { set_memory(c,_gvn.type(adr)->is_ptr()); }
   // Get the entire memory state (probably a MergeMemNode), and reset it
   // (The resetting prevents somebody from using the dangling Node pointer.)
   Node* reset_memory();
   // Get the entire memory state, asserted to be a MergeMemNode.
   MergeMemNode* merged_memory() {
     Node* mem = map_not_null()->memory();
     assert(mem->is_MergeMem(), "parse memory is always pre-split");
     return mem->as_MergeMem();
   }
   // Set the entire memory state; produce a new MergeMemNode.
   void set_all_memory(Node* newmem);
   // Create a memory projection from the call, then set_all_memory.
   void set_all_memory_call(Node* call, bool separate_io_proj = false);
   // Create a LoadNode, reading from the parser's memory state.
   // (Note:  require_atomic_access is useful only with T_LONG.)
   Node* make_load(Node* ctl, Node* adr, const Type* t, BasicType bt,
                   bool require_atomic_access = false) {
     // This version computes alias_index from bottom_type
     return make_load(ctl, adr, t, bt, adr->bottom_type()->is_ptr(),
                      require_atomic_access);
   }
   Node* make_load(Node* ctl, Node* adr, const Type* t, BasicType bt, const TypePtr* adr_type, bool require_atomic_access = false) {
     // This version computes alias_index from an address type
     assert(adr_type != NULL, "use other make_load factory");
     return make_load(ctl, adr, t, bt, C->get_alias_index(adr_type),
                      require_atomic_access);
   }
   // This is the base version which is given an alias index.
   Node* make_load(Node* ctl, Node* adr, const Type* t, BasicType bt, int adr_idx, bool require_atomic_access = false);
   // Create & transform a StoreNode and store the effect into the
   // parser's memory state.
   Node* store_to_memory(Node* ctl, Node* adr, Node* val, BasicType bt,
                         const TypePtr* adr_type,
                         bool require_atomic_access = false) {
     // This version computes alias_index from an address type
     assert(adr_type != NULL, "use other store_to_memory factory");
     return store_to_memory(ctl, adr, val, bt,
                            C->get_alias_index(adr_type),
                            require_atomic_access);
   }
   // This is the base version which is given alias index
   // Return the new StoreXNode
   Node* store_to_memory(Node* ctl, Node* adr, Node* val, BasicType bt,
                         int adr_idx,
                         bool require_atomic_access = false);
   // All in one pre-barrier, store, post_barrier
   // Insert a write-barrier'd store.  This is to let generational GC
   // work; we have to flag all oop-stores before the next GC point.
   //
   // It comes in 3 flavors of store to an object, array, or unknown.
   // We use precise card marks for arrays to avoid scanning the entire
   // array. We use imprecise for object. We use precise for unknown
   // since we don't know if we have an array or and object or even
   // where the object starts.
   //
   // If val==NULL, it is taken to be a completely unknown value. QQQ
   Node* store_oop(Node* ctl,
                   Node* obj,   // containing obj
                   Node* adr,  // actual adress to store val at
                   const TypePtr* adr_type,
                   Node* val,
                   const TypeOopPtr* val_type,
                   BasicType bt,
                   bool use_precise);
   Node* store_oop_to_object(Node* ctl,
                             Node* obj,   // containing obj
                             Node* adr,  // actual adress to store val at
                             const TypePtr* adr_type,
                             Node* val,
                             const TypeOopPtr* val_type,
                             BasicType bt) {
     return store_oop(ctl, obj, adr, adr_type, val, val_type, bt, false);
   }
   Node* store_oop_to_array(Node* ctl,
                            Node* obj,   // containing obj
                            Node* adr,  // actual adress to store val at
                            const TypePtr* adr_type,
                            Node* val,
                            const TypeOopPtr* val_type,
                            BasicType bt) {
     return store_oop(ctl, obj, adr, adr_type, val, val_type, bt, true);
   }
   // Could be an array or object we don't know at compile time (unsafe ref.)
   Node* store_oop_to_unknown(Node* ctl,
                              Node* obj,   // containing obj
                              Node* adr,  // actual adress to store val at
                              const TypePtr* adr_type,
                              Node* val,
                              BasicType bt);
   // For the few case where the barriers need special help
   void pre_barrier(Node* ctl, Node* obj, Node* adr, uint adr_idx,
                    Node* val, const TypeOopPtr* val_type, BasicType bt);
   void post_barrier(Node* ctl, Node* store, Node* obj, Node* adr, uint adr_idx,
                     Node* val, BasicType bt, bool use_precise);
   // Return addressing for an array element.
   Node* array_element_address(Node* ary, Node* idx, BasicType elembt,
                               // Optional constraint on the array size:
                               const TypeInt* sizetype = NULL);
   // Return a load of array element at idx.
   Node* load_array_element(Node* ctl, Node* ary, Node* idx, const TypeAryPtr* arytype);
   //---------------- Dtrace support --------------------
   void make_dtrace_method_entry_exit(ciMethod* method, bool is_entry);
   void make_dtrace_method_entry(ciMethod* method) {
     make_dtrace_method_entry_exit(method, true);
   }
   void make_dtrace_method_exit(ciMethod* method) {
     make_dtrace_method_entry_exit(method, false);
   }
   //--------------- stub generation -------------------
  public:
   void gen_stub(address C_function,
                 const char *name,
                 int is_fancy_jump,
                 bool pass_tls,
                 bool return_pc);
   //---------- help for generating calls --------------
   // Do a null check on the receiver, which is in argument(0).
   Node* null_check_receiver(ciMethod* callee) {
     assert(!callee->is_static(), "must be a virtual method");
     int nargs = 1 + callee->signature()->size();
     // Null check on self without removing any arguments.  The argument
     // null check technically happens in the wrong place, which can lead to
     // invalid stack traces when the primitive is inlined into a method
     // which handles NullPointerExceptions.
     Node* receiver = argument(0);
     _sp += nargs;
     receiver = do_null_check(receiver, T_OBJECT);
     _sp -= nargs;
     return receiver;
   }
   // Fill in argument edges for the call from argument(0), argument(1), ...
   // (The next step is to call set_edges_for_java_call.)
   void  set_arguments_for_java_call(CallJavaNode* call);
   // Fill in non-argument edges for the call.
   // Transform the call, and update the basics: control, i_o, memory.
   // (The next step is usually to call set_results_for_java_call.)
   void set_edges_for_java_call(CallJavaNode* call,
                                bool must_throw = false, bool separate_io_proj = false);
   // Finish up a java call that was started by set_edges_for_java_call.
   // Call add_exception on any throw arising from the call.
   // Return the call result (transformed).
   Node* set_results_for_java_call(CallJavaNode* call, bool separate_io_proj = false);
   // Similar to set_edges_for_java_call, but simplified for runtime calls.
   void  set_predefined_output_for_runtime_call(Node* call) {
     set_predefined_output_for_runtime_call(call, NULL, NULL);
   }
   void  set_predefined_output_for_runtime_call(Node* call,
                                                Node* keep_mem,
                                                const TypePtr* hook_mem);
   Node* set_predefined_input_for_runtime_call(SafePointNode* call);
   // Replace the call with the current state of the kit.  Requires
   // that the call was generated with separate io_projs so that
   // exceptional control flow can be handled properly.
   void replace_call(CallNode* call, Node* result);
   // helper functions for statistics
   void increment_counter(address counter_addr);   // increment a debug counter
   void increment_counter(Node*   counter_addr);   // increment a debug counter
   // Bail out to the interpreter right now
   // The optional klass is the one causing the trap.
   // The optional reason is debug information written to the compile log.
   // Optional must_throw is the same as with add_safepoint_edges.
   void uncommon_trap(int trap_request,
                      ciKlass* klass = NULL, const char* reason_string = NULL,
                      bool must_throw = false, bool keep_exact_action = false);
   // Shorthand, to avoid saying "Deoptimization::" so many times.
   void uncommon_trap(Deoptimization::DeoptReason reason,
                      Deoptimization::DeoptAction action,
                      ciKlass* klass = NULL, const char* reason_string = NULL,
                      bool must_throw = false, bool keep_exact_action = false) {
     uncommon_trap(Deoptimization::make_trap_request(reason, action),
                   klass, reason_string, must_throw, keep_exact_action);
   }
   // Report if there were too many traps at the current method and bci.
   // Report if a trap was recorded, and/or PerMethodTrapLimit was exceeded.
   // If there is no MDO at all, report no trap unless told to assume it.
   bool too_many_traps(Deoptimization::DeoptReason reason) {
     return C->too_many_traps(method(), bci(), reason);
   }
   // Report if there were too many recompiles at the current method and bci.
   bool too_many_recompiles(Deoptimization::DeoptReason reason) {
     return C->too_many_recompiles(method(), bci(), reason);
   }
   // Returns the object (if any) which was created the moment before.
   Node* just_allocated_object(Node* current_control);
   static bool use_ReduceInitialCardMarks() {
     return (ReduceInitialCardMarks
             && Universe::heap()->can_elide_tlab_store_barriers());
   }
   void sync_kit(IdealKit& ideal);
   // vanilla/CMS post barrier
   void write_barrier_post(Node *store, Node* obj,
                           Node* adr,  uint adr_idx, Node* val, bool use_precise);
   // G1 pre/post barriers
   void g1_write_barrier_pre(Node* obj,
                             Node* adr,
                             uint alias_idx,
                             Node* val,
                             const TypeOopPtr* val_type,
                             BasicType bt);
   void g1_write_barrier_post(Node* store,
                              Node* obj,
                              Node* adr,
                              uint alias_idx,
                              Node* val,
                              BasicType bt,
                              bool use_precise);
   // Helper function for g1
   private:
   void g1_mark_card(IdealKit& ideal, Node* card_adr, Node* store, uint oop_alias_idx,
                     Node* index, Node* index_adr,
                     Node* buffer, const TypeFunc* tf);
   public:
   // Helper function to round double arguments before a call
   void round_double_arguments(ciMethod* dest_method);
   void round_double_result(ciMethod* dest_method);
   // rounding for strict float precision conformance
   Node* precision_rounding(Node* n);
   // rounding for strict double precision conformance
   Node* dprecision_rounding(Node* n);
   // rounding for non-strict double stores
   Node* dstore_rounding(Node* n);
   // Helper functions for fast/slow path codes
   Node* opt_iff(Node* region, Node* iff);
   Node* make_runtime_call(int flags,
                           const TypeFunc* call_type, address call_addr,
                           const char* call_name,
                           const TypePtr* adr_type, // NULL if no memory effects
                           Node* parm0 = NULL, Node* parm1 = NULL,
                           Node* parm2 = NULL, Node* parm3 = NULL,
                           Node* parm4 = NULL, Node* parm5 = NULL,
                           Node* parm6 = NULL, Node* parm7 = NULL);
   enum {  // flag values for make_runtime_call
     RC_NO_FP = 1,               // CallLeafNoFPNode
     RC_NO_IO = 2,               // do not hook IO edges
     RC_NO_LEAF = 4,             // CallStaticJavaNode
     RC_MUST_THROW = 8,          // flag passed to add_safepoint_edges
     RC_NARROW_MEM = 16,         // input memory is same as output
     RC_UNCOMMON = 32,           // freq. expected to be like uncommon trap
     RC_LEAF = 0                 // null value:  no flags set
   };
   // merge in all memory slices from new_mem, along the given path
   void merge_memory(Node* new_mem, Node* region, int new_path);
   void make_slow_call_ex(Node* call, ciInstanceKlass* ex_klass, bool separate_io_proj);
   // Helper functions to build synchronizations
   int next_monitor();
   Node* insert_mem_bar(int opcode, Node* precedent = NULL);
   Node* insert_mem_bar_volatile(int opcode, int alias_idx, Node* precedent = NULL);
   // Optional 'precedent' is appended as an extra edge, to force ordering.
   FastLockNode* shared_lock(Node* obj);
   void shared_unlock(Node* box, Node* obj);
   // helper functions for the fast path/slow path idioms
   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);
   // Generate an instance-of idiom.  Used by both the instance-of bytecode
   // and the reflective instance-of call.
   Node* gen_instanceof( Node *subobj, Node* superkls );
   // Generate a check-cast idiom.  Used by both the check-cast bytecode
   // and the array-store bytecode
   Node* gen_checkcast( Node *subobj, Node* superkls,
                        Node* *failure_control = NULL );
   // Generate a subtyping check.  Takes as input the subtype and supertype.
   // Returns 2 values: sets the default control() to the true path and
   // returns the false path.  Only reads from constant memory taken from the
   // default memory; does not write anything.  It also doesn't take in an
   // Object; if you wish to check an Object you need to load the Object's
   // class prior to coming here.
   Node* gen_subtype_check(Node* subklass, Node* superklass);
   // Static parse-time type checking logic for gen_subtype_check:
   enum { SSC_always_false, SSC_always_true, SSC_easy_test, SSC_full_test };
   int static_subtype_check(ciKlass* superk, ciKlass* subk);
   // Exact type check used for predicted calls and casts.
   // Rewrites (*casted_receiver) to be casted to the stronger type.
   // (Caller is responsible for doing replace_in_map.)
   Node* type_check_receiver(Node* receiver, ciKlass* klass, float prob,
                             Node* *casted_receiver);
   // implementation of object creation
   Node* set_output_for_allocation(AllocateNode* alloc,
                                   const TypeOopPtr* oop_type,
                                   bool raw_mem_only);
   Node* get_layout_helper(Node* klass_node, jint& constant_value);
   Node* new_instance(Node* klass_node,
                      Node* slow_test = NULL,
                      bool raw_mem_only = false,
                      Node* *return_size_val = NULL);
   Node* new_array(Node* klass_node, Node* count_val, int nargs,
                   bool raw_mem_only = false, Node* *return_size_val = NULL);
   // Handy for making control flow
   IfNode* create_and_map_if(Node* ctrl, Node* tst, float prob, float cnt) {
     IfNode* iff = new (C, 2) IfNode(ctrl, tst, prob, cnt);// New IfNode's
     _gvn.set_type(iff, iff->Value(&_gvn)); // Value may be known at parse-time
     // Place 'if' on worklist if it will be in graph
     if (!tst->is_Con())  record_for_igvn(iff);     // Range-check and Null-check removal is later
     return iff;
   }
   IfNode* create_and_xform_if(Node* ctrl, Node* tst, float prob, float cnt) {
     IfNode* iff = new (C, 2) IfNode(ctrl, tst, prob, cnt);// New IfNode's
     _gvn.transform(iff);                           // Value may be known at parse-time
     // Place 'if' on worklist if it will be in graph
     if (!tst->is_Con())  record_for_igvn(iff);     // Range-check and Null-check removal is later
     return iff;
   }
 };
 // Helper class to support building of control flow branches. Upon
 // creation the map and sp at bci are cloned and restored upon de-
 // struction. Typical use:
 //
 // { PreserveJVMState pjvms(this);
 //   // code of new branch
 // }
 // // here the JVM state at bci is established
 class PreserveJVMState: public StackObj {
  protected:
   GraphKit*      _kit;
 #ifdef ASSERT
   int            _block;  // PO of current block, if a Parse
   int            _bci;
 #endif
   SafePointNode* _map;
   uint           _sp;
  public:
   PreserveJVMState(GraphKit* kit, bool clone_map = true);
   ~PreserveJVMState();
 };
 // Helper class to build cutouts of the form if (p) ; else {x...}.
 // The code {x...} must not fall through.
 // The kit's main flow of control is set to the "then" continuation of if(p).
 class BuildCutout: public PreserveJVMState {
  public:
   BuildCutout(GraphKit* kit, Node* p, float prob, float cnt = COUNT_UNKNOWN);
   ~BuildCutout();
 };
 // Helper class to preserve the original _reexecute bit and _sp and restore
 // them back
 class PreserveReexecuteState: public StackObj {
  protected:
   GraphKit*                 _kit;
   uint                      _sp;
   JVMState::ReexecuteState  _reexecute;
  public:
   PreserveReexecuteState(GraphKit* kit);
   ~PreserveReexecuteState();
 };

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/opto/graphKit.hpp@7c57aead6d3e (annotated)

src/share/vm/opto/graphKit.hpp