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 /*

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  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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  * This code is free software; you can redistribute it and/or modify it

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  * published by the Free Software Foundation.

  *

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  * 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

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 #ifndef SHARE_VM_OOPS_GENERATEOOPMAP_HPP

 #define SHARE_VM_OOPS_GENERATEOOPMAP_HPP

 #include "interpreter/bytecodeStream.hpp"

 #include "memory/allocation.inline.hpp"

 #include "memory/universe.inline.hpp"

 #include "oops/methodOop.hpp"

 #include "oops/oopsHierarchy.hpp"

 #include "runtime/signature.hpp"

 // Forward definition

 class MethodOopMap;

 class GenerateOopMap;

 class BasicBlock;

 class CellTypeState;

 class StackMap;

 // These two should be removed. But requires som code to be cleaned up

 #define MAXARGSIZE      256      // This should be enough

 #define MAX_LOCAL_VARS  65536    // 16-bit entry

 typedef void (*jmpFct_t)(GenerateOopMap *c, int bcpDelta, int* data);

 //  RetTable

 //

 // Contains maping between jsr targets and there return addresses. One-to-many mapping

 //

 class RetTableEntry : public ResourceObj {

  private:

   static int _init_nof_jsrs;                      // Default size of jsrs list

   int _target_bci;                                // Target PC address of jump (bytecode index)

   GrowableArray<intptr_t> * _jsrs;                     // List of return addresses  (bytecode index)

   RetTableEntry *_next;                           // Link to next entry

  public:

    RetTableEntry(int target, RetTableEntry *next)  { _target_bci=target; _jsrs = new GrowableArray<intptr_t>(_init_nof_jsrs); _next = next;  }

   // Query

   int target_bci() const                      { return _target_bci; }

   int nof_jsrs() const                        { return _jsrs->length(); }

   int jsrs(int i) const                       { assert(i>=0 && i<nof_jsrs(), "Index out of bounds"); return _jsrs->at(i); }

   // Update entry

   void add_jsr    (int return_bci)            { _jsrs->append(return_bci); }

   void add_delta  (int bci, int delta);

   RetTableEntry * next()  const               { return _next; }

 };

 class RetTable VALUE_OBJ_CLASS_SPEC {

  private:

   RetTableEntry *_first;

   static int _init_nof_entries;

   void add_jsr(int return_bci, int target_bci);   // Adds entry to list

  public:

   RetTable()                                                  { _first = NULL; }

   void compute_ret_table(methodHandle method);

   void update_ret_table(int bci, int delta);

   RetTableEntry* find_jsrs_for_target(int targBci);

 };

 //

 // CellTypeState

 //

 class CellTypeState VALUE_OBJ_CLASS_SPEC {

  private:

   unsigned int _state;

   // Masks for separating the BITS and INFO portions of a CellTypeState

   enum { info_mask            = right_n_bits(28),

          bits_mask            = (int)(~info_mask) };

   // These constant are used for manipulating the BITS portion of a

   // CellTypeState

   enum { uninit_bit           = (int)(nth_bit(31)),

          ref_bit              = nth_bit(30),

          val_bit              = nth_bit(29),

          addr_bit             = nth_bit(28),

          live_bits_mask       = (int)(bits_mask & ~uninit_bit) };

   // These constants are used for manipulating the INFO portion of a

   // CellTypeState

   enum { top_info_bit         = nth_bit(27),

          not_bottom_info_bit  = nth_bit(26),

          info_data_mask       = right_n_bits(26),

          info_conflict        = info_mask };

   // Within the INFO data, these values are used to distinguish different

   // kinds of references.

   enum { ref_not_lock_bit     = nth_bit(25),  // 0 if this reference is locked as a monitor

          ref_slot_bit         = nth_bit(24),  // 1 if this reference is a "slot" reference,

                                               // 0 if it is a "line" reference.

          ref_data_mask        = right_n_bits(24) };

   // These values are used to initialize commonly used CellTypeState

   // constants.

   enum { bottom_value         = 0,

          uninit_value         = (int)(uninit_bit | info_conflict),

          ref_value            = ref_bit,

          ref_conflict         = ref_bit | info_conflict,

          val_value            = val_bit | info_conflict,

          addr_value           = addr_bit,

          addr_conflict        = addr_bit | info_conflict };

  public:

   // Since some C++ constructors generate poor code for declarations of the

   // form...

   //

   //   CellTypeState vector[length];

   //

   // ...we avoid making a constructor for this class.  CellTypeState values

   // should be constructed using one of the make_* methods:

   static CellTypeState make_any(int state) {

     CellTypeState s;

     s._state = state;

     // Causes SS10 warning.

     // assert(s.is_valid_state(), "check to see if CellTypeState is valid");

     return s;

   }

   static CellTypeState make_bottom() {

     return make_any(0);

   }

   static CellTypeState make_top() {

     return make_any(AllBits);

   }

   static CellTypeState make_addr(int bci) {

     assert((bci >= 0) && (bci < info_data_mask), "check to see if ret addr is valid");

     return make_any(addr_bit | not_bottom_info_bit | (bci & info_data_mask));

   }

   static CellTypeState make_slot_ref(int slot_num) {

     assert(slot_num >= 0 && slot_num < ref_data_mask, "slot out of range");

     return make_any(ref_bit | not_bottom_info_bit | ref_not_lock_bit | ref_slot_bit |

                     (slot_num & ref_data_mask));

   }

   static CellTypeState make_line_ref(int bci) {

     assert(bci >= 0 && bci < ref_data_mask, "line out of range");

     return make_any(ref_bit | not_bottom_info_bit | ref_not_lock_bit |

                     (bci & ref_data_mask));

   }

   static CellTypeState make_lock_ref(int bci) {

     assert(bci >= 0 && bci < ref_data_mask, "line out of range");

     return make_any(ref_bit | not_bottom_info_bit | (bci & ref_data_mask));

   }

   // Query methods:

   bool is_bottom() const                { return _state == 0; }

   bool is_live() const                  { return ((_state & live_bits_mask) != 0); }

   bool is_valid_state() const {

     // Uninitialized and value cells must contain no data in their info field:

     if ((can_be_uninit() || can_be_value()) && !is_info_top()) {

       return false;

     }

     // The top bit is only set when all info bits are set:

     if (is_info_top() && ((_state & info_mask) != info_mask)) {

       return false;

     }

     // The not_bottom_bit must be set when any other info bit is set:

     if (is_info_bottom() && ((_state & info_mask) != 0)) {

       return false;

     }

     return true;

   }

   bool is_address() const               { return ((_state & bits_mask) == addr_bit); }

   bool is_reference() const             { return ((_state & bits_mask) == ref_bit); }

   bool is_value() const                 { return ((_state & bits_mask) == val_bit); }

   bool is_uninit() const                { return ((_state & bits_mask) == (uint)uninit_bit); }

   bool can_be_address() const           { return ((_state & addr_bit) != 0); }

   bool can_be_reference() const         { return ((_state & ref_bit) != 0); }

   bool can_be_value() const             { return ((_state & val_bit) != 0); }

   bool can_be_uninit() const            { return ((_state & uninit_bit) != 0); }

   bool is_info_bottom() const           { return ((_state & not_bottom_info_bit) == 0); }

   bool is_info_top() const              { return ((_state & top_info_bit) != 0); }

   int  get_info() const {

     assert((!is_info_top() && !is_info_bottom()),

            "check to make sure top/bottom info is not used");

     return (_state & info_data_mask);

   }

   bool is_good_address() const          { return is_address() && !is_info_top(); }

   bool is_lock_reference() const {

     return ((_state & (bits_mask | top_info_bit | ref_not_lock_bit)) == ref_bit);

   }

   bool is_nonlock_reference() const {

     return ((_state & (bits_mask | top_info_bit | ref_not_lock_bit)) == (ref_bit | ref_not_lock_bit));

   }

   bool equal(CellTypeState a) const     { return _state == a._state; }

   bool equal_kind(CellTypeState a) const {

     return (_state & bits_mask) == (a._state & bits_mask);

   }

   char to_char() const;

   // Merge

   CellTypeState merge (CellTypeState cts, int slot) const;

   // Debugging output

   void print(outputStream *os);

   // Default values of common values

   static CellTypeState bottom;

   static CellTypeState uninit;

   static CellTypeState ref;

   static CellTypeState value;

   static CellTypeState refUninit;

   static CellTypeState varUninit;

   static CellTypeState top;

   static CellTypeState addr;

 };

 //

 // BasicBlockStruct

 //

 class BasicBlock: ResourceObj {

  private:

   bool            _changed;                 // Reached a fixpoint or not

  public:

   enum Constants {

     _dead_basic_block = -2,

     _unreached        = -1                  // Alive but not yet reached by analysis

     // >=0                                  // Alive and has a merged state

   };

   int             _bci;                     // Start of basic block

   int             _end_bci;                 // Bci of last instruction in basicblock

   int             _max_locals;              // Determines split between vars and stack

   int             _max_stack;               // Determines split between stack and monitors

   CellTypeState*  _state;                   // State (vars, stack) at entry.

   int             _stack_top;               // -1 indicates bottom stack value.

   int             _monitor_top;             // -1 indicates bottom monitor stack value.

   CellTypeState* vars()                     { return _state; }

   CellTypeState* stack()                    { return _state + _max_locals; }

   bool changed()                            { return _changed; }

   void set_changed(bool s)                  { _changed = s; }

   bool is_reachable() const                 { return _stack_top >= 0; }  // Analysis has reached this basicblock

   // All basicblocks that are unreachable are going to have a _stack_top == _dead_basic_block.

   // This info. is setup in a pre-parse before the real abstract interpretation starts.

   bool is_dead() const                      { return _stack_top == _dead_basic_block; }

   bool is_alive() const                     { return _stack_top != _dead_basic_block; }

   void mark_as_alive()                      { assert(is_dead(), "must be dead"); _stack_top = _unreached; }

 };

 //

 //  GenerateOopMap

 //

 // Main class used to compute the pointer-maps in a MethodOop

 //

 class GenerateOopMap VALUE_OBJ_CLASS_SPEC {

  protected:

   // _monitor_top is set to this constant to indicate that a monitor matching

   // problem was encountered prior to this point in control flow.

   enum { bad_monitors = -1 };

   // Main variables

   methodHandle _method;                     // The method we are examine

   RetTable     _rt;                         // Contains the return address mappings

   int          _max_locals;                 // Cached value of no. of locals

   int          _max_stack;                  // Cached value of max. stack depth

   int          _max_monitors;               // Cached value of max. monitor stack depth

   int          _has_exceptions;             // True, if exceptions exist for method

   bool         _got_error;                  // True, if an error occurred during interpretation.

   Handle       _exception;                  // Exception if got_error is true.

   bool         _did_rewriting;              // was bytecodes rewritten

   bool         _did_relocation;             // was relocation neccessary

   bool         _monitor_safe;               // The monitors in this method have been determined

                                             // to be safe.

   // Working Cell type state

   int            _state_len;                // Size of states

   CellTypeState *_state;                    // list of states

   char          *_state_vec_buf;            // Buffer used to print a readable version of a state

   int            _stack_top;

   int            _monitor_top;

   // Timing and statistics

   static elapsedTimer _total_oopmap_time;   // Holds cumulative oopmap generation time

   static long         _total_byte_count;    // Holds cumulative number of bytes inspected

   // Cell type methods

   void            init_state();

   void            make_context_uninitialized ();

   int             methodsig_to_effect        (Symbol* signature, bool isStatic, CellTypeState* effect);

   bool            merge_local_state_vectors  (CellTypeState* cts, CellTypeState* bbts);

   bool            merge_monitor_state_vectors(CellTypeState* cts, CellTypeState* bbts);

   void            copy_state                 (CellTypeState *dst, CellTypeState *src);

   void            merge_state_into_bb        (BasicBlock *bb);

   static void     merge_state                (GenerateOopMap *gom, int bcidelta, int* data);

   void            set_var                    (int localNo, CellTypeState cts);

   CellTypeState   get_var                    (int localNo);

   CellTypeState   pop                        ();

   void            push                       (CellTypeState cts);

   CellTypeState   monitor_pop                ();

   void            monitor_push               (CellTypeState cts);

   CellTypeState * vars                       ()                                             { return _state; }

   CellTypeState * stack                      ()                                             { return _state+_max_locals; }

   CellTypeState * monitors                   ()                                             { return _state+_max_locals+_max_stack; }

   void            replace_all_CTS_matches    (CellTypeState match,

                                               CellTypeState replace);

   void            print_states               (outputStream *os, CellTypeState *vector, int num);

   void            print_current_state        (outputStream   *os,

                                               BytecodeStream *itr,

                                               bool            detailed);

   void            report_monitor_mismatch    (const char *msg);

   // Basicblock info

   BasicBlock *    _basic_blocks;             // Array of basicblock info

   int             _gc_points;

   int             _bb_count;

   BitMap          _bb_hdr_bits;

   // Basicblocks methods

   void          initialize_bb               ();

   void          mark_bbheaders_and_count_gc_points();

   bool          is_bb_header                (int bci) const   {

     return _bb_hdr_bits.at(bci);

   }

   int           gc_points                   () const                          { return _gc_points; }

   int           bb_count                    () const                          { return _bb_count; }

   void          set_bbmark_bit              (int bci) {

     _bb_hdr_bits.at_put(bci, true);

   }

   void          clear_bbmark_bit            (int bci) {

     _bb_hdr_bits.at_put(bci, false);

   }

   BasicBlock *  get_basic_block_at          (int bci) const;

   BasicBlock *  get_basic_block_containing  (int bci) const;

   void          interp_bb                   (BasicBlock *bb);

   void          restore_state               (BasicBlock *bb);

   int           next_bb_start_pc            (BasicBlock *bb);

   void          update_basic_blocks         (int bci, int delta, int new_method_size);

   static void   bb_mark_fct                 (GenerateOopMap *c, int deltaBci, int *data);

   // Dead code detection

   void          mark_reachable_code();

   static void   reachable_basicblock        (GenerateOopMap *c, int deltaBci, int *data);

   // Interpretation methods (primary)

   void  do_interpretation                   ();

   void  init_basic_blocks                   ();

   void  setup_method_entry_state            ();

   void  interp_all                          ();

   // Interpretation methods (secondary)

   void  interp1                             (BytecodeStream *itr);

   void  do_exception_edge                   (BytecodeStream *itr);

   void  check_type                          (CellTypeState expected, CellTypeState actual);

   void  ppstore                             (CellTypeState *in,  int loc_no);

   void  ppload                              (CellTypeState *out, int loc_no);

   void  ppush1                              (CellTypeState in);

   void  ppush                               (CellTypeState *in);

   void  ppop1                               (CellTypeState out);

   void  ppop                                (CellTypeState *out);

   void  ppop_any                            (int poplen);

   void  pp                                  (CellTypeState *in, CellTypeState *out);

   void  pp_new_ref                          (CellTypeState *in, int bci);

   void  ppdupswap                           (int poplen, const char *out);

   void  do_ldc                              (int bci);

   void  do_astore                           (int idx);

   void  do_jsr                              (int delta);

   void  do_field                            (int is_get, int is_static, int idx, int bci);

   void  do_method                           (int is_static, int is_interface, int idx, int bci);

   void  do_multianewarray                   (int dims, int bci);

   void  do_monitorenter                     (int bci);

   void  do_monitorexit                      (int bci);

   void  do_return_monitor_check             ();

   void  do_checkcast                        ();

   CellTypeState *sigchar_to_effect          (char sigch, int bci, CellTypeState *out);

   int copy_cts                              (CellTypeState *dst, CellTypeState *src);

   // Error handling

   void  error_work                          (const char *format, va_list ap);

   void  report_error                        (const char *format, ...);

   void  verify_error                        (const char *format, ...);

   bool  got_error()                         { return _got_error; }

   // Create result set

   bool  _report_result;

   bool  _report_result_for_send;            // Unfortunatly, stackmaps for sends are special, so we need some extra

   BytecodeStream *_itr_send;                // variables to handle them properly.

   void  report_result                       ();

   // Initvars

   GrowableArray<intptr_t> * _init_vars;

   void  initialize_vars                     ();

   void  add_to_ref_init_set                 (int localNo);

   // Conflicts rewrite logic

   bool      _conflict;                      // True, if a conflict occurred during interpretation

   int       _nof_refval_conflicts;          // No. of conflicts that require rewrites

   int *     _new_var_map;

   void record_refval_conflict               (int varNo);

   void rewrite_refval_conflicts             ();

   void rewrite_refval_conflict              (int from, int to);

   bool rewrite_refval_conflict_inst         (BytecodeStream *i, int from, int to);

   bool rewrite_load_or_store                (BytecodeStream *i, Bytecodes::Code bc, Bytecodes::Code bc0, unsigned int varNo);

   void expand_current_instr                 (int bci, int ilen, int newIlen, u_char inst_buffer[]);

   bool is_astore                            (BytecodeStream *itr, int *index);

   bool is_aload                             (BytecodeStream *itr, int *index);

   // List of bci's where a return address is on top of the stack

   GrowableArray<intptr_t> *_ret_adr_tos;

   bool stack_top_holds_ret_addr             (int bci);

   void compute_ret_adr_at_TOS               ();

   void update_ret_adr_at_TOS                (int bci, int delta);

   int  binsToHold                           (int no)                      { return  ((no+(BitsPerWord-1))/BitsPerWord); }

   char *state_vec_to_string                 (CellTypeState* vec, int len);

   // Helper method. Can be used in subclasses to fx. calculate gc_points. If the current instuction

   // is a control transfer, then calls the jmpFct all possible destinations.

   void  ret_jump_targets_do                 (BytecodeStream *bcs, jmpFct_t jmpFct, int varNo,int *data);

   bool  jump_targets_do                     (BytecodeStream *bcs, jmpFct_t jmpFct, int *data);

   friend class RelocCallback;

  public:

   GenerateOopMap(methodHandle method);

   // Compute the map.

   void compute_map(TRAPS);

   void result_for_basicblock(int bci);    // Do a callback on fill_stackmap_for_opcodes for basicblock containing bci

   // Query

   int max_locals() const                           { return _max_locals; }

   methodOop method() const                         { return _method(); }

   methodHandle method_as_handle() const            { return _method; }

   bool did_rewriting()                             { return _did_rewriting; }

   bool did_relocation()                            { return _did_relocation; }

   static void print_time();

   // Monitor query

   bool monitor_safe()                              { return _monitor_safe; }

   // Specialization methods. Intended use:

   // - possible_gc_point must return true for every bci for which the stackmaps must be returned

   // - fill_stackmap_prolog is called just before the result is reported. The arguments tells the estimated

   //   number of gc points

   // - fill_stackmap_for_opcodes is called once for each bytecode index in order (0...code_length-1)

   // - fill_stackmap_epilog is called after all results has been reported. Note: Since the algorithm does not report

   //   stackmaps for deadcode, fewer gc_points might have been encounted than assumed during the epilog. It is the

   //   responsibility of the subclass to count the correct number.

   // - fill_init_vars are called once with the result of the init_vars computation

   //

   // All these methods are used during a call to: compute_map. Note: Non of the return results are valid

   // after compute_map returns, since all values are allocated as resource objects.

   //

   // All virtual method must be implemented in subclasses

   virtual bool allow_rewrites             () const                        { return false; }

   virtual bool report_results             () const                        { return true;  }

   virtual bool report_init_vars           () const                        { return true;  }

   virtual bool possible_gc_point          (BytecodeStream *bcs)           { ShouldNotReachHere(); return false; }

   virtual void fill_stackmap_prolog       (int nof_gc_points)             { ShouldNotReachHere(); }

   virtual void fill_stackmap_epilog       ()                              { ShouldNotReachHere(); }

   virtual void fill_stackmap_for_opcodes  (BytecodeStream *bcs,

                                            CellTypeState* vars,

                                            CellTypeState* stack,

                                            int stackTop)                  { ShouldNotReachHere(); }

   virtual void fill_init_vars             (GrowableArray<intptr_t> *init_vars) { ShouldNotReachHere();; }

 };

 //

 // Subclass of the GenerateOopMap Class that just do rewrites of the method, if needed.

 // It does not store any oopmaps.

 //

 class ResolveOopMapConflicts: public GenerateOopMap {

  private:

   bool _must_clear_locals;

   virtual bool report_results() const     { return false; }

   virtual bool report_init_vars() const   { return true;  }

   virtual bool allow_rewrites() const     { return true;  }

   virtual bool possible_gc_point          (BytecodeStream *bcs)           { return false; }

   virtual void fill_stackmap_prolog       (int nof_gc_points)             {}

   virtual void fill_stackmap_epilog       ()                              {}

   virtual void fill_stackmap_for_opcodes  (BytecodeStream *bcs,

                                            CellTypeState* vars,

                                            CellTypeState* stack,

                                            int stack_top)                 {}

   virtual void fill_init_vars             (GrowableArray<intptr_t> *init_vars) { _must_clear_locals = init_vars->length() > 0; }

 #ifndef PRODUCT

   // Statistics

   static int _nof_invocations;

   static int _nof_rewrites;

   static int _nof_relocations;

 #endif

  public:

   ResolveOopMapConflicts(methodHandle method) : GenerateOopMap(method) { _must_clear_locals = false; };

   methodHandle do_potential_rewrite(TRAPS);

   bool must_clear_locals() const { return _must_clear_locals; }

 };

 //

 // Subclass used by the compiler to generate pairing infomation

 //

 class GeneratePairingInfo: public GenerateOopMap {

  private:

   virtual bool report_results() const     { return false; }

   virtual bool report_init_vars() const   { return false; }

   virtual bool allow_rewrites() const     { return false;  }

   virtual bool possible_gc_point          (BytecodeStream *bcs)           { return false; }

   virtual void fill_stackmap_prolog       (int nof_gc_points)             {}

   virtual void fill_stackmap_epilog       ()                              {}

   virtual void fill_stackmap_for_opcodes  (BytecodeStream *bcs,

                                            CellTypeState* vars,

                                            CellTypeState* stack,

                                            int stack_top)                 {}

   virtual void fill_init_vars             (GrowableArray<intptr_t> *init_vars) {}

  public:

   GeneratePairingInfo(methodHandle method) : GenerateOopMap(method)       {};

   // Call compute_map(CHECK) to generate info.

 };

 #endif // SHARE_VM_OOPS_GENERATEOOPMAP_HPP