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 /*

  * Copyright (c) 1997, 2011, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

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 #ifndef SHARE_VM_OPTO_PARSE_HPP

 #define SHARE_VM_OPTO_PARSE_HPP

 #include "ci/ciMethodData.hpp"

 #include "ci/ciTypeFlow.hpp"

 #include "compiler/methodLiveness.hpp"

 #include "libadt/vectset.hpp"

 #include "oops/generateOopMap.hpp"

 #include "opto/graphKit.hpp"

 #include "opto/subnode.hpp"

 class BytecodeParseHistogram;

 class InlineTree;

 class Parse;

 class SwitchRange;

 //------------------------------InlineTree-------------------------------------

 class InlineTree : public ResourceObj {

   Compile*    C;                  // cache

   JVMState*   _caller_jvms;       // state of caller

   ciMethod*   _method;            // method being called by the caller_jvms

   InlineTree* _caller_tree;

   uint        _count_inline_bcs;  // Accumulated count of inlined bytecodes

   // Call-site count / interpreter invocation count, scaled recursively.

   // Always between 0.0 and 1.0.  Represents the percentage of the method's

   // total execution time used at this call site.

   const float _site_invoke_ratio;

   const int   _site_depth_adjust;

   float compute_callee_frequency( int caller_bci ) const;

   GrowableArray<InlineTree*> _subtrees;

   friend class Compile;

 protected:

   InlineTree(Compile* C,

              const InlineTree* caller_tree,

              ciMethod* callee_method,

              JVMState* caller_jvms,

              int caller_bci,

              float site_invoke_ratio,

              int site_depth_adjust);

   InlineTree *build_inline_tree_for_callee(ciMethod* callee_method,

                                            JVMState* caller_jvms,

                                            int caller_bci);

   const char* try_to_inline(ciMethod* callee_method, ciMethod* caller_method, int caller_bci, ciCallProfile& profile, WarmCallInfo* wci_result);

   const char* should_inline(ciMethod* callee_method, ciMethod* caller_method, int caller_bci, ciCallProfile& profile, WarmCallInfo* wci_result) const;

   const char* should_not_inline(ciMethod* callee_method, ciMethod* caller_method, WarmCallInfo* wci_result) const;

   void        print_inlining(ciMethod *callee_method, int caller_bci, const char *failure_msg) const;

   InlineTree *caller_tree()       const { return _caller_tree;  }

   InlineTree* callee_at(int bci, ciMethod* m) const;

   int         inline_depth()      const { return stack_depth() + _site_depth_adjust; }

   int         stack_depth()       const { return _caller_jvms ? _caller_jvms->depth() : 0; }

 public:

   static InlineTree* build_inline_tree_root();

   static InlineTree* find_subtree_from_root(InlineTree* root, JVMState* jvms, ciMethod* callee, bool create_if_not_found = false);

   // For temporary (stack-allocated, stateless) ilts:

   InlineTree(Compile* c, ciMethod* callee_method, JVMState* caller_jvms, float site_invoke_ratio, int site_depth_adjust);

   // InlineTree enum

   enum InlineStyle {

     Inline_do_not_inline             =   0, //

     Inline_cha_is_monomorphic        =   1, //

     Inline_type_profile_monomorphic  =   2  //

   };

   // See if it is OK to inline.

   // The receiver is the inline tree for the caller.

   //

   // The result is a temperature indication.  If it is hot or cold,

   // inlining is immediate or undesirable.  Otherwise, the info block

   // returned is newly allocated and may be enqueued.

   //

   // If the method is inlinable, a new inline subtree is created on the fly,

   // and may be accessed by find_subtree_from_root.

   // The call_method is the dest_method for a special or static invocation.

   // The call_method is an optimized virtual method candidate otherwise.

   WarmCallInfo* ok_to_inline(ciMethod *call_method, JVMState* caller_jvms, ciCallProfile& profile, WarmCallInfo* wci);

   // Information about inlined method

   JVMState*   caller_jvms()       const { return _caller_jvms; }

   ciMethod   *method()            const { return _method; }

   int         caller_bci()        const { return _caller_jvms ? _caller_jvms->bci() : InvocationEntryBci; }

   uint        count_inline_bcs()  const { return _count_inline_bcs; }

   float       site_invoke_ratio() const { return _site_invoke_ratio; };

 #ifndef PRODUCT

 private:

   uint        _count_inlines;     // Count of inlined methods

 public:

   // Debug information collected during parse

   uint        count_inlines()     const { return _count_inlines; };

 #endif

   GrowableArray<InlineTree*> subtrees() { return _subtrees; }

 };

 //-----------------------------------------------------------------------------

 //------------------------------Parse------------------------------------------

 // Parse bytecodes, build a Graph

 class Parse : public GraphKit {

  public:

   // Per-block information needed by the parser:

   class Block {

    private:

     ciTypeFlow::Block* _flow;

     int                _pred_count;     // how many predecessors in CFG?

     int                _preds_parsed;   // how many of these have been parsed?

     uint               _count;          // how many times executed?  Currently only set by _goto's

     bool               _is_parsed;      // has this block been parsed yet?

     bool               _is_handler;     // is this block an exception handler?

     bool               _has_merged_backedge; // does this block have merged backedge?

     SafePointNode*     _start_map;      // all values flowing into this block

     MethodLivenessResult _live_locals;  // lazily initialized liveness bitmap

     int                _num_successors; // Includes only normal control flow.

     int                _all_successors; // Include exception paths also.

     Block**            _successors;

     // Use init_node/init_graph to initialize Blocks.

     // Block() : _live_locals((uintptr_t*)NULL,0) { ShouldNotReachHere(); }

     Block() : _live_locals(NULL,0) { ShouldNotReachHere(); }

    public:

     // Set up the block data structure itself.

     void init_node(Parse* outer, int po);

     // Set up the block's relations to other blocks.

     void init_graph(Parse* outer);

     ciTypeFlow::Block* flow() const        { return _flow; }

     int pred_count() const                 { return _pred_count; }

     int preds_parsed() const               { return _preds_parsed; }

     bool is_parsed() const                 { return _is_parsed; }

     bool is_handler() const                { return _is_handler; }

     void set_count( uint x )               { _count = x; }

     uint count() const                     { return _count; }

     SafePointNode* start_map() const       { assert(is_merged(),"");   return _start_map; }

     void set_start_map(SafePointNode* m)   { assert(!is_merged(), ""); _start_map = m; }

     // True after any predecessor flows control into this block

     bool is_merged() const                 { return _start_map != NULL; }

 #ifdef ASSERT

     // True after backedge predecessor flows control into this block

     bool has_merged_backedge() const       { return _has_merged_backedge; }

     void mark_merged_backedge(Block* pred) {

       assert(is_SEL_head(), "should be loop head");

       if (pred != NULL && is_SEL_backedge(pred)) {

         assert(is_parsed(), "block should be parsed before merging backedges");

         _has_merged_backedge = true;

       }

     }

 #endif

     // True when all non-exception predecessors have been parsed.

     bool is_ready() const                  { return preds_parsed() == pred_count(); }

     int num_successors() const             { return _num_successors; }

     int all_successors() const             { return _all_successors; }

     Block* successor_at(int i) const {

       assert((uint)i < (uint)all_successors(), "");

       return _successors[i];

     }

     Block* successor_for_bci(int bci);

     int start() const                      { return flow()->start(); }

     int limit() const                      { return flow()->limit(); }

     int rpo() const                        { return flow()->rpo(); }

     int start_sp() const                   { return flow()->stack_size(); }

     bool is_loop_head() const              { return flow()->is_loop_head(); }

     bool is_SEL_head() const               { return flow()->is_single_entry_loop_head(); }

     bool is_SEL_backedge(Block* pred) const{ return is_SEL_head() && pred->rpo() >= rpo(); }

     bool is_invariant_local(uint i) const  {

       const JVMState* jvms = start_map()->jvms();

       if (!jvms->is_loc(i) || flow()->outer()->has_irreducible_entry()) return false;

       return flow()->is_invariant_local(i - jvms->locoff());

     }

     bool can_elide_SEL_phi(uint i) const  { assert(is_SEL_head(),""); return is_invariant_local(i); }

     const Type* peek(int off=0) const      { return stack_type_at(start_sp() - (off+1)); }

     const Type* stack_type_at(int i) const;

     const Type* local_type_at(int i) const;

     static const Type* get_type(ciType* t) { return Type::get_typeflow_type(t); }

     bool has_trap_at(int bci) const        { return flow()->has_trap() && flow()->trap_bci() == bci; }

     // Call this just before parsing a block.

     void mark_parsed() {

       assert(!_is_parsed, "must parse each block exactly once");

       _is_parsed = true;

     }

     // Return the phi/region input index for the "current" pred,

     // and bump the pred number.  For historical reasons these index

     // numbers are handed out in descending order.  The last index is

     // always PhiNode::Input (i.e., 1).  The value returned is known

     // as a "path number" because it distinguishes by which path we are

     // entering the block.

     int next_path_num() {

       assert(preds_parsed() < pred_count(), "too many preds?");

       return pred_count() - _preds_parsed++;

     }

     // Add a previously unaccounted predecessor to this block.

     // This operates by increasing the size of the block's region

     // and all its phi nodes (if any).  The value returned is a

     // path number ("pnum").

     int add_new_path();

     // Initialize me by recording the parser's map.  My own map must be NULL.

     void record_state(Parse* outer);

   };

 #ifndef PRODUCT

   // BytecodeParseHistogram collects number of bytecodes parsed, nodes constructed, and transformations.

   class BytecodeParseHistogram : public ResourceObj {

    private:

     enum BPHType {

       BPH_transforms,

       BPH_values

     };

     static bool _initialized;

     static uint _bytecodes_parsed [Bytecodes::number_of_codes];

     static uint _nodes_constructed[Bytecodes::number_of_codes];

     static uint _nodes_transformed[Bytecodes::number_of_codes];

     static uint _new_values       [Bytecodes::number_of_codes];

     Bytecodes::Code _initial_bytecode;

     int             _initial_node_count;

     int             _initial_transforms;

     int             _initial_values;

     Parse     *_parser;

     Compile   *_compiler;

     // Initialization

     static void reset();

     // Return info being collected, select with global flag 'BytecodeParseInfo'

     int current_count(BPHType info_selector);

    public:

     BytecodeParseHistogram(Parse *p, Compile *c);

     static bool initialized();

     // Record info when starting to parse one bytecode

     void set_initial_state( Bytecodes::Code bc );

     // Record results of parsing one bytecode

     void record_change();

     // Profile printing

     static void print(float cutoff = 0.01F); // cutoff in percent

   };

   public:

     // Record work done during parsing

     BytecodeParseHistogram* _parse_histogram;

     void set_parse_histogram(BytecodeParseHistogram *bph) { _parse_histogram = bph; }

     BytecodeParseHistogram* parse_histogram()      { return _parse_histogram; }

 #endif

  private:

   friend class Block;

   // Variables which characterize this compilation as a whole:

   JVMState*     _caller;        // JVMS which carries incoming args & state.

   float         _expected_uses; // expected number of calls to this code

   float         _prof_factor;   // discount applied to my profile counts

   int           _depth;         // Inline tree depth, for debug printouts

   const TypeFunc*_tf;           // My kind of function type

   int           _entry_bci;     // the osr bci or InvocationEntryBci

   ciTypeFlow*   _flow;          // Results of previous flow pass.

   Block*        _blocks;        // Array of basic-block structs.

   int           _block_count;   // Number of elements in _blocks.

   GraphKit      _exits;         // Record all normal returns and throws here.

   bool          _wrote_final;   // Did we write a final field?

   bool          _count_invocations; // update and test invocation counter

   bool          _method_data_update; // update method data oop

   // Variables which track Java semantics during bytecode parsing:

   Block*            _block;     // block currently getting parsed

   ciBytecodeStream  _iter;      // stream of this method's bytecodes

   int           _blocks_merged; // Progress meter: state merges from BB preds

   int           _blocks_parsed; // Progress meter: BBs actually parsed

   const FastLockNode* _synch_lock; // FastLockNode for synchronized method

 #ifndef PRODUCT

   int _max_switch_depth;        // Debugging SwitchRanges.

   int _est_switch_depth;        // Debugging SwitchRanges.

 #endif

  public:

   // Constructor

   Parse(JVMState* caller, ciMethod* parse_method, float expected_uses);

   virtual Parse* is_Parse() const { return (Parse*)this; }

  public:

   // Accessors.

   JVMState*     caller()        const { return _caller; }

   float         expected_uses() const { return _expected_uses; }

   float         prof_factor()   const { return _prof_factor; }

   int           depth()         const { return _depth; }

   const TypeFunc* tf()          const { return _tf; }

   //            entry_bci()     -- see osr_bci, etc.

   ciTypeFlow*   flow()          const { return _flow; }

   //            blocks()        -- see rpo_at, start_block, etc.

   int           block_count()   const { return _block_count; }

   GraphKit&     exits()               { return _exits; }

   bool          wrote_final() const   { return _wrote_final; }

   void      set_wrote_final(bool z)   { _wrote_final = z; }

   bool          count_invocations() const  { return _count_invocations; }

   bool          method_data_update() const { return _method_data_update; }

   Block*             block()    const { return _block; }

   ciBytecodeStream&  iter()           { return _iter; }

   Bytecodes::Code    bc()       const { return _iter.cur_bc(); }

   void set_block(Block* b)            { _block = b; }

   // Derived accessors:

   bool is_normal_parse() const  { return _entry_bci == InvocationEntryBci; }

   bool is_osr_parse() const     { return _entry_bci != InvocationEntryBci; }

   int osr_bci() const           { assert(is_osr_parse(),""); return _entry_bci; }

   void set_parse_bci(int bci);

   // Must this parse be aborted?

   bool failing()                { return C->failing(); }

   Block* rpo_at(int rpo) {

     assert(0 <= rpo && rpo < _block_count, "oob");

     return &_blocks[rpo];

   }

   Block* start_block() {

     return rpo_at(flow()->start_block()->rpo());

   }

   // Can return NULL if the flow pass did not complete a block.

   Block* successor_for_bci(int bci) {

     return block()->successor_for_bci(bci);

   }

  private:

   // Create a JVMS & map for the initial state of this method.

   SafePointNode* create_entry_map();

   // OSR helpers

   Node *fetch_interpreter_state(int index, BasicType bt, Node *local_addrs, Node *local_addrs_base);

   Node* check_interpreter_type(Node* l, const Type* type, SafePointNode* &bad_type_exit);

   void  load_interpreter_state(Node* osr_buf);

   // Functions for managing basic blocks:

   void init_blocks();

   void load_state_from(Block* b);

   void store_state_to(Block* b) { b->record_state(this); }

   // Parse all the basic blocks.

   void do_all_blocks();

   // Parse the current basic block

   void do_one_block();

   // Raise an error if we get a bad ciTypeFlow CFG.

   void handle_missing_successor(int bci);

   // first actions (before BCI 0)

   void do_method_entry();

   // implementation of monitorenter/monitorexit

   void do_monitor_enter();

   void do_monitor_exit();

   // Eagerly create phie throughout the state, to cope with back edges.

   void ensure_phis_everywhere();

   // Merge the current mapping into the basic block starting at bci

   void merge(          int target_bci);

   // Same as plain merge, except that it allocates a new path number.

   void merge_new_path( int target_bci);

   // Merge the current mapping into an exception handler.

   void merge_exception(int target_bci);

   // Helper: Merge the current mapping into the given basic block

   void merge_common(Block* target, int pnum);

   // Helper functions for merging individual cells.

   PhiNode *ensure_phi(       int idx, bool nocreate = false);

   PhiNode *ensure_memory_phi(int idx, bool nocreate = false);

   // Helper to merge the current memory state into the given basic block

   void merge_memory_edges(MergeMemNode* n, int pnum, bool nophi);

   // Parse this bytecode, and alter the Parsers JVM->Node mapping

   void do_one_bytecode();

   // helper function to generate array store check

   void array_store_check();

   // Helper function to generate array load

   void array_load(BasicType etype);

   // Helper function to generate array store

   void array_store(BasicType etype);

   // Helper function to compute array addressing

   Node* array_addressing(BasicType type, int vals, const Type* *result2=NULL);

   // Pass current map to exits

   void return_current(Node* value);

   // Register finalizers on return from Object.<init>

   void call_register_finalizer();

   // Insert a compiler safepoint into the graph

   void add_safepoint();

   // Insert a compiler safepoint into the graph, if there is a back-branch.

   void maybe_add_safepoint(int target_bci) {

     if (UseLoopSafepoints && target_bci <= bci()) {

       add_safepoint();

     }

   }

   // Note:  Intrinsic generation routines may be found in library_call.cpp.

   // Helper function to setup Ideal Call nodes

   void do_call();

   // Helper function to uncommon-trap or bailout for non-compilable call-sites

   bool can_not_compile_call_site(ciMethod *dest_method, ciInstanceKlass *klass);

   // Helper function to identify inlining potential at call-site

   ciMethod* optimize_inlining(ciMethod* caller, int bci, ciInstanceKlass* klass,

                               ciMethod *dest_method, const TypeOopPtr* receiver_type);

   // Helper function to setup for type-profile based inlining

   bool prepare_type_profile_inline(ciInstanceKlass* prof_klass, ciMethod* prof_method);

   // Helper functions for type checking bytecodes:

   void  do_checkcast();

   void  do_instanceof();

   // Helper functions for shifting & arithmetic

   void modf();

   void modd();

   void l2f();

   void do_irem();

   // implementation of _get* and _put* bytecodes

   void do_getstatic() { do_field_access(true,  false); }

   void do_getfield () { do_field_access(true,  true); }

   void do_putstatic() { do_field_access(false, false); }

   void do_putfield () { do_field_access(false, true); }

   // common code for making initial checks and forming addresses

   void do_field_access(bool is_get, bool is_field);

   bool static_field_ok_in_clinit(ciField *field, ciMethod *method);

   // common code for actually performing the load or store

   void do_get_xxx(Node* obj, ciField* field, bool is_field);

   void do_put_xxx(Node* obj, ciField* field, bool is_field);

   // loading from a constant field or the constant pool

   // returns false if push failed (non-perm field constants only, not ldcs)

   bool push_constant(ciConstant con, bool require_constant = false);

   // implementation of object creation bytecodes

   void emit_guard_for_new(ciInstanceKlass* klass);

   void do_new();

   void do_newarray(BasicType elemtype);

   void do_anewarray();

   void do_multianewarray();

   Node* expand_multianewarray(ciArrayKlass* array_klass, Node* *lengths, int ndimensions, int nargs);

   // implementation of jsr/ret

   void do_jsr();

   void do_ret();

   float   dynamic_branch_prediction(float &cnt);

   float   branch_prediction(float &cnt, BoolTest::mask btest, int target_bci);

   bool    seems_never_taken(float prob);

   bool    seems_stable_comparison(BoolTest::mask btest, Node* c);

   void    do_ifnull(BoolTest::mask btest, Node* c);

   void    do_if(BoolTest::mask btest, Node* c);

   int     repush_if_args();

   void    adjust_map_after_if(BoolTest::mask btest, Node* c, float prob,

                               Block* path, Block* other_path);

   IfNode* jump_if_fork_int(Node* a, Node* b, BoolTest::mask mask);

   Node*   jump_if_join(Node* iffalse, Node* iftrue);

   void    jump_if_true_fork(IfNode *ifNode, int dest_bci_if_true, int prof_table_index);

   void    jump_if_false_fork(IfNode *ifNode, int dest_bci_if_false, int prof_table_index);

   void    jump_if_always_fork(int dest_bci_if_true, int prof_table_index);

   friend class SwitchRange;

   void    do_tableswitch();

   void    do_lookupswitch();

   void    jump_switch_ranges(Node* a, SwitchRange* lo, SwitchRange* hi, int depth = 0);

   bool    create_jump_tables(Node* a, SwitchRange* lo, SwitchRange* hi);

   // helper functions for methodData style profiling

   void test_counter_against_threshold(Node* cnt, int limit);

   void increment_and_test_invocation_counter(int limit);

   void test_for_osr_md_counter_at(ciMethodData* md, ciProfileData* data, ByteSize offset, int limit);

   Node* method_data_addressing(ciMethodData* md, ciProfileData* data, ByteSize offset, Node* idx = NULL, uint stride = 0);

   void increment_md_counter_at(ciMethodData* md, ciProfileData* data, ByteSize offset, Node* idx = NULL, uint stride = 0);

   void set_md_flag_at(ciMethodData* md, ciProfileData* data, int flag_constant);

   void profile_method_entry();

   void profile_taken_branch(int target_bci, bool force_update = false);

   void profile_not_taken_branch(bool force_update = false);

   void profile_call(Node* receiver);

   void profile_generic_call();

   void profile_receiver_type(Node* receiver);

   void profile_ret(int target_bci);

   void profile_null_checkcast();

   void profile_switch_case(int table_index);

   // helper function for call statistics

   void count_compiled_calls(bool at_method_entry, bool is_inline) PRODUCT_RETURN;

   Node_Notes* make_node_notes(Node_Notes* caller_nn);

   // Helper functions for handling normal and abnormal exits.

   void build_exits();

   // Fix up all exceptional control flow exiting a single bytecode.

   void do_exceptions();

   // Fix up all exiting control flow at the end of the parse.

   void do_exits();

   // Add Catch/CatchProjs

   // The call is either a Java call or the VM's rethrow stub

   void catch_call_exceptions(ciExceptionHandlerStream&);

   // Handle all exceptions thrown by the inlined method.

   // Also handles exceptions for individual bytecodes.

   void catch_inline_exceptions(SafePointNode* ex_map);

   // Merge the given map into correct exceptional exit state.

   // Assumes that there is no applicable local handler.

   void throw_to_exit(SafePointNode* ex_map);

  public:

 #ifndef PRODUCT

   // Handle PrintOpto, etc.

   void show_parse_info();

   void dump_map_adr_mem() const;

   static void print_statistics(); // Print some performance counters

   void dump();

   void dump_bci(int bci);

 #endif

 };

 #endif // SHARE_VM_OPTO_PARSE_HPP