jdk8-mips64-public/hotspot: src/share/vm/ci/ciTypeFlow.hpp@a61af66fc99e (annotated)

src/share/vm/ci/ciTypeFlow.hpp@a61af66fc99e (annotated)

src/share/vm/ci/ciTypeFlow.hpp

Sat, 01 Dec 2007 00:00:00 +0000

author: duke
date: Sat, 01 Dec 2007 00:00:00 +0000
changeset 435: a61af66fc99e
child 738: fa4d1d240383
permissions: -rw-r--r--

Initial load

 /*
  * Copyright 2000-2006 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 ciTypeFlow : public ResourceObj {
 private:
   ciEnv*    _env;
   ciMethod* _method;
   ciMethodBlocks* _methodBlocks;
   int       _osr_bci;
   // information cached from the method:
   int _max_locals;
   int _max_stack;
   int _code_size;
   const char* _failure_reason;
 public:
   class StateVector;
   class Block;
   // Build a type flow analyzer
   // Do an OSR analysis if osr_bci >= 0.
   ciTypeFlow(ciEnv* env, ciMethod* method, int osr_bci = InvocationEntryBci);
   // Accessors
   ciMethod* method() const     { return _method; }
   ciEnv*    env()              { return _env; }
   Arena*    arena()            { return _env->arena(); }
   bool      is_osr_flow() const{ return _osr_bci != InvocationEntryBci; }
   int       start_bci() const  { return is_osr_flow()? _osr_bci: 0; }
   int       max_locals() const { return _max_locals; }
   int       max_stack() const  { return _max_stack; }
   int       max_cells() const  { return _max_locals + _max_stack; }
   int       code_size() const  { return _code_size; }
   // Represents information about an "active" jsr call.  This
   // class represents a call to the routine at some entry address
   // with some distinct return address.
   class JsrRecord : public ResourceObj {
   private:
     int _entry_address;
     int _return_address;
   public:
     JsrRecord(int entry_address, int return_address) {
       _entry_address = entry_address;
       _return_address = return_address;
     }
     int entry_address() const  { return _entry_address; }
     int return_address() const { return _return_address; }
     void print_on(outputStream* st) const {
 #ifndef PRODUCT
       st->print("%d->%d", entry_address(), return_address());
 #endif
     }
   };
   // A JsrSet represents some set of JsrRecords.  This class
   // is used to record a set of all jsr routines which we permit
   // execution to return (ret) from.
   //
   // During abstract interpretation, JsrSets are used to determine
   // whether two paths which reach a given block are unique, and
   // should be cloned apart, or are compatible, and should merge
   // together.
   //
   // Note that different amounts of effort can be expended determining
   // if paths are compatible.  <DISCUSSION>
   class JsrSet : public ResourceObj {
   private:
     GrowableArray<JsrRecord*>* _set;
     JsrRecord* record_at(int i) {
       return _set->at(i);
     }
     // Insert the given JsrRecord into the JsrSet, maintaining the order
     // of the set and replacing any element with the same entry address.
     void insert_jsr_record(JsrRecord* record);
     // Remove the JsrRecord with the given return address from the JsrSet.
     void remove_jsr_record(int return_address);
   public:
     JsrSet(Arena* arena, int default_len = 4);
     // Copy this JsrSet.
     void copy_into(JsrSet* jsrs);
     // Is this JsrSet compatible with some other JsrSet?
     bool is_compatible_with(JsrSet* other);
     // Apply the effect of a single bytecode to the JsrSet.
     void apply_control(ciTypeFlow* analyzer,
                        ciBytecodeStream* str,
                        StateVector* state);
     // What is the cardinality of this set?
     int size() const { return _set->length(); }
     void print_on(outputStream* st) const PRODUCT_RETURN;
   };
   // Used as a combined index for locals and temps
   enum Cell {
     Cell_0
   };
   // A StateVector summarizes the type information at some
   // point in the program
   class StateVector : public ResourceObj {
   private:
     ciType**    _types;
     int         _stack_size;
     int         _monitor_count;
     ciTypeFlow* _outer;
     int         _trap_bci;
     int         _trap_index;
     static ciType* type_meet_internal(ciType* t1, ciType* t2, ciTypeFlow* analyzer);
   public:
     // Special elements in our type lattice.
     enum {
       T_TOP     = T_VOID,      // why not?
       T_BOTTOM  = T_CONFLICT,
       T_LONG2   = T_SHORT,     // 2nd word of T_LONG
       T_DOUBLE2 = T_CHAR,      // 2nd word of T_DOUBLE
       T_NULL    = T_BYTE       // for now.
     };
     static ciType* top_type()    { return ciType::make((BasicType)T_TOP); }
     static ciType* bottom_type() { return ciType::make((BasicType)T_BOTTOM); }
     static ciType* long2_type()  { return ciType::make((BasicType)T_LONG2); }
     static ciType* double2_type(){ return ciType::make((BasicType)T_DOUBLE2); }
     static ciType* null_type()   { return ciType::make((BasicType)T_NULL); }
     static ciType* half_type(ciType* t) {
       switch (t->basic_type()) {
       case T_LONG:    return long2_type();
       case T_DOUBLE:  return double2_type();
       default:        ShouldNotReachHere(); return NULL;
       }
     }
     // The meet operation for our type lattice.
     ciType* type_meet(ciType* t1, ciType* t2) {
       return type_meet_internal(t1, t2, outer());
     }
     // Accessors
     ciTypeFlow* outer() const          { return _outer; }
     int         stack_size() const     { return _stack_size; }
     void    set_stack_size(int ss)     { _stack_size = ss; }
     int         monitor_count() const  { return _monitor_count; }
     void    set_monitor_count(int mc)  { _monitor_count = mc; }
     static Cell start_cell()           { return (Cell)0; }
     static Cell next_cell(Cell c)      { return (Cell)(((int)c) + 1); }
     Cell        limit_cell() const {
       return (Cell)(outer()->max_locals() + stack_size());
     }
     // Cell creation
     Cell      local(int lnum) const {
       assert(lnum < outer()->max_locals(), "index check");
       return (Cell)(lnum);
     }
     Cell      stack(int snum) const {
       assert(snum < stack_size(), "index check");
       return (Cell)(outer()->max_locals() + snum);
     }
     Cell      tos() const { return stack(stack_size()-1); }
     // For external use only:
     ciType* local_type_at(int i) const { return type_at(local(i)); }
     ciType* stack_type_at(int i) const { return type_at(stack(i)); }
     // Accessors for the type of some Cell c
     ciType*   type_at(Cell c) const {
       assert(start_cell() <= c && c < limit_cell(), "out of bounds");
       return _types[c];
     }
     void      set_type_at(Cell c, ciType* type) {
       assert(start_cell() <= c && c < limit_cell(), "out of bounds");
       _types[c] = type;
     }
     // Top-of-stack operations.
     void      set_type_at_tos(ciType* type) { set_type_at(tos(), type); }
     ciType*   type_at_tos() const           { return type_at(tos()); }
     void      push(ciType* type) {
       _stack_size++;
       set_type_at_tos(type);
     }
     void      pop() {
       debug_only(set_type_at_tos(bottom_type()));
       _stack_size--;
     }
     ciType*   pop_value() {
       ciType* t = type_at_tos();
       pop();
       return t;
     }
     // Convenience operations.
     bool      is_reference(ciType* type) const {
       return type == null_type() || !type->is_primitive_type();
     }
     bool      is_int(ciType* type) const {
       return type->basic_type() == T_INT;
     }
     bool      is_long(ciType* type) const {
       return type->basic_type() == T_LONG;
     }
     bool      is_float(ciType* type) const {
       return type->basic_type() == T_FLOAT;
     }
     bool      is_double(ciType* type) const {
       return type->basic_type() == T_DOUBLE;
     }
     void      push_translate(ciType* type);
     void      push_int() {
       push(ciType::make(T_INT));
     }
     void      pop_int() {
       assert(is_int(type_at_tos()), "must be integer");
       pop();
     }
     void      check_int(Cell c) {
       assert(is_int(type_at(c)), "must be integer");
     }
     void      push_double() {
       push(ciType::make(T_DOUBLE));
       push(double2_type());
     }
     void      pop_double() {
       assert(type_at_tos() == double2_type(), "must be 2nd half");
       pop();
       assert(is_double(type_at_tos()), "must be double");
       pop();
     }
     void      push_float() {
       push(ciType::make(T_FLOAT));
     }
     void      pop_float() {
       assert(is_float(type_at_tos()), "must be float");
       pop();
     }
     void      push_long() {
       push(ciType::make(T_LONG));
       push(long2_type());
     }
     void      pop_long() {
       assert(type_at_tos() == long2_type(), "must be 2nd half");
       pop();
       assert(is_long(type_at_tos()), "must be long");
       pop();
     }
     void      push_object(ciKlass* klass) {
       push(klass);
     }
     void      pop_object() {
       assert(is_reference(type_at_tos()), "must be reference type");
       pop();
     }
     void      pop_array() {
       assert(type_at_tos() == null_type() ||
              type_at_tos()->is_array_klass(), "must be array type");
       pop();
     }
     // pop_objArray and pop_typeArray narrow the tos to ciObjArrayKlass
     // or ciTypeArrayKlass (resp.).  In the rare case that an explicit
     // null is popped from the stack, we return NULL.  Caller beware.
     ciObjArrayKlass* pop_objArray() {
       ciType* array = pop_value();
       if (array == null_type())  return NULL;
       assert(array->is_obj_array_klass(), "must be object array type");
       return array->as_obj_array_klass();
     }
     ciTypeArrayKlass* pop_typeArray() {
       ciType* array = pop_value();
       if (array == null_type())  return NULL;
       assert(array->is_type_array_klass(), "must be prim array type");
       return array->as_type_array_klass();
     }
     void      push_null() {
       push(null_type());
     }
     void      do_null_assert(ciKlass* unloaded_klass);
     // Helper convenience routines.
     void do_aaload(ciBytecodeStream* str);
     void do_checkcast(ciBytecodeStream* str);
     void do_getfield(ciBytecodeStream* str);
     void do_getstatic(ciBytecodeStream* str);
     void do_invoke(ciBytecodeStream* str, bool has_receiver);
     void do_jsr(ciBytecodeStream* str);
     void do_ldc(ciBytecodeStream* str);
     void do_multianewarray(ciBytecodeStream* str);
     void do_new(ciBytecodeStream* str);
     void do_newarray(ciBytecodeStream* str);
     void do_putfield(ciBytecodeStream* str);
     void do_putstatic(ciBytecodeStream* str);
     void do_ret(ciBytecodeStream* str);
     void overwrite_local_double_long(int index) {
       // Invalidate the previous local if it contains first half of
       // a double or long value since it's seconf half is being overwritten.
       int prev_index = index - 1;
       if (prev_index >= 0 &&
           (is_double(type_at(local(prev_index))) ||
            is_long(type_at(local(prev_index))))) {
         set_type_at(local(prev_index), bottom_type());
       }
     }
     void load_local_object(int index) {
       ciType* type = type_at(local(index));
       assert(is_reference(type), "must be reference type");
       push(type);
     }
     void store_local_object(int index) {
       ciType* type = pop_value();
       assert(is_reference(type) || type->is_return_address(),
              "must be reference type or return address");
       overwrite_local_double_long(index);
       set_type_at(local(index), type);
     }
     void load_local_double(int index) {
       ciType* type = type_at(local(index));
       ciType* type2 = type_at(local(index+1));
       assert(is_double(type), "must be double type");
       assert(type2 == double2_type(), "must be 2nd half");
       push(type);
       push(double2_type());
     }
     void store_local_double(int index) {
       ciType* type2 = pop_value();
       ciType* type = pop_value();
       assert(is_double(type), "must be double");
       assert(type2 == double2_type(), "must be 2nd half");
       overwrite_local_double_long(index);
       set_type_at(local(index), type);
       set_type_at(local(index+1), type2);
     }
     void load_local_float(int index) {
       ciType* type = type_at(local(index));
       assert(is_float(type), "must be float type");
       push(type);
     }
     void store_local_float(int index) {
       ciType* type = pop_value();
       assert(is_float(type), "must be float type");
       overwrite_local_double_long(index);
       set_type_at(local(index), type);
     }
     void load_local_int(int index) {
       ciType* type = type_at(local(index));
       assert(is_int(type), "must be int type");
       push(type);
     }
     void store_local_int(int index) {
       ciType* type = pop_value();
       assert(is_int(type), "must be int type");
       overwrite_local_double_long(index);
       set_type_at(local(index), type);
     }
     void load_local_long(int index) {
       ciType* type = type_at(local(index));
       ciType* type2 = type_at(local(index+1));
       assert(is_long(type), "must be long type");
       assert(type2 == long2_type(), "must be 2nd half");
       push(type);
       push(long2_type());
     }
     void store_local_long(int index) {
       ciType* type2 = pop_value();
       ciType* type = pop_value();
       assert(is_long(type), "must be long");
       assert(type2 == long2_type(), "must be 2nd half");
       overwrite_local_double_long(index);
       set_type_at(local(index), type);
       set_type_at(local(index+1), type2);
     }
     // Stop interpretation of this path with a trap.
     void trap(ciBytecodeStream* str, ciKlass* klass, int index);
   public:
     StateVector(ciTypeFlow* outer);
     // Copy our value into some other StateVector
     void copy_into(StateVector* copy) const;
     // Meets this StateVector with another, destructively modifying this
     // one.  Returns true if any modification takes place.
     bool meet(const StateVector* incoming);
     // Ditto, except that the incoming state is coming from an exception.
     bool meet_exception(ciInstanceKlass* exc, const StateVector* incoming);
     // Apply the effect of one bytecode to this StateVector
     bool apply_one_bytecode(ciBytecodeStream* stream);
     // What is the bci of the trap?
     int  trap_bci() { return _trap_bci; }
     // What is the index associated with the trap?
     int  trap_index() { return _trap_index; }
     void print_cell_on(outputStream* st, Cell c) const PRODUCT_RETURN;
     void print_on(outputStream* st) const              PRODUCT_RETURN;
   };
   // Parameter for "find_block" calls:
   // Describes the difference between a public and private copy.
   enum CreateOption {
     create_public_copy,
     create_private_copy,
     no_create
   };
   // A basic block
   class Block : public ResourceObj {
   private:
     ciBlock*                          _ciblock;
     GrowableArray<Block*>*           _exceptions;
     GrowableArray<ciInstanceKlass*>* _exc_klasses;
     GrowableArray<Block*>*           _successors;
     StateVector*                     _state;
     JsrSet*                          _jsrs;
     int                              _trap_bci;
     int                              _trap_index;
     // A reasonable approximation to pre-order, provided.to the client.
     int                              _pre_order;
     // Has this block been cloned for some special purpose?
     bool                             _private_copy;
     // A pointer used for our internal work list
     Block*                 _next;
     bool                   _on_work_list;
     ciBlock*     ciblock() const     { return _ciblock; }
     StateVector* state() const     { return _state; }
     // Compute the exceptional successors and types for this Block.
     void compute_exceptions();
   public:
     // constructors
     Block(ciTypeFlow* outer, ciBlock* ciblk, JsrSet* jsrs);
     void set_trap(int trap_bci, int trap_index) {
       _trap_bci = trap_bci;
       _trap_index = trap_index;
       assert(has_trap(), "");
     }
     bool has_trap()   const  { return _trap_bci != -1; }
     int  trap_bci()   const  { assert(has_trap(), ""); return _trap_bci; }
     int  trap_index() const  { assert(has_trap(), ""); return _trap_index; }
     // accessors
     ciTypeFlow* outer() const { return state()->outer(); }
     int start() const         { return _ciblock->start_bci(); }
     int limit() const         { return _ciblock->limit_bci(); }
     int control() const       { return _ciblock->control_bci(); }
     bool    is_private_copy() const       { return _private_copy; }
     void   set_private_copy(bool z);
     int        private_copy_count() const { return outer()->private_copy_count(ciblock()->index(), _jsrs); }
     // access to entry state
     int     stack_size() const         { return _state->stack_size(); }
     int     monitor_count() const      { return _state->monitor_count(); }
     ciType* local_type_at(int i) const { return _state->local_type_at(i); }
     ciType* stack_type_at(int i) const { return _state->stack_type_at(i); }
     // Get the successors for this Block.
     GrowableArray<Block*>* successors(ciBytecodeStream* str,
                                       StateVector* state,
                                       JsrSet* jsrs);
     GrowableArray<Block*>* successors() {
       assert(_successors != NULL, "must be filled in");
       return _successors;
     }
     // Helper function for "successors" when making private copies of
     // loop heads for C2.
     Block * clone_loop_head(ciTypeFlow* analyzer,
                             int branch_bci,
                             Block* target,
                             JsrSet* jsrs);
     // Get the exceptional successors for this Block.
     GrowableArray<Block*>* exceptions() {
       if (_exceptions == NULL) {
         compute_exceptions();
       }
       return _exceptions;
     }
     // Get the exception klasses corresponding to the
     // exceptional successors for this Block.
     GrowableArray<ciInstanceKlass*>* exc_klasses() {
       if (_exc_klasses == NULL) {
         compute_exceptions();
       }
       return _exc_klasses;
     }
     // Is this Block compatible with a given JsrSet?
     bool is_compatible_with(JsrSet* other) {
       return _jsrs->is_compatible_with(other);
     }
     // Copy the value of our state vector into another.
     void copy_state_into(StateVector* copy) const {
       _state->copy_into(copy);
     }
     // Copy the value of our JsrSet into another
     void copy_jsrs_into(JsrSet* copy) const {
       _jsrs->copy_into(copy);
     }
     // Meets the start state of this block with another state, destructively
     // modifying this one.  Returns true if any modification takes place.
     bool meet(const StateVector* incoming) {
       return state()->meet(incoming);
     }
     // Ditto, except that the incoming state is coming from an
     // exception path.  This means the stack is replaced by the
     // appropriate exception type.
     bool meet_exception(ciInstanceKlass* exc, const StateVector* incoming) {
       return state()->meet_exception(exc, incoming);
     }
     // Work list manipulation
     void   set_next(Block* block) { _next = block; }
     Block* next() const           { return _next; }
     void   set_on_work_list(bool c) { _on_work_list = c; }
     bool   is_on_work_list() const  { return _on_work_list; }
     bool   has_pre_order() const  { return _pre_order >= 0; }
     void   set_pre_order(int po)  { assert(!has_pre_order() && po >= 0, ""); _pre_order = po; }
     int    pre_order() const      { assert(has_pre_order(), ""); return _pre_order; }
     bool   is_start() const       { return _pre_order == outer()->start_block_num(); }
     // A ranking used in determining order within the work list.
     bool   is_simpler_than(Block* other);
     void   print_value_on(outputStream* st) const PRODUCT_RETURN;
     void   print_on(outputStream* st) const       PRODUCT_RETURN;
   };
   // Standard indexes of successors, for various bytecodes.
   enum {
     FALL_THROUGH   = 0,  // normal control
     IF_NOT_TAKEN   = 0,  // the not-taken branch of an if (i.e., fall-through)
     IF_TAKEN       = 1,  // the taken branch of an if
     GOTO_TARGET    = 0,  // unique successor for goto, jsr, or ret
     SWITCH_DEFAULT = 0,  // default branch of a switch
     SWITCH_CASES   = 1   // first index for any non-default switch branches
     // Unlike in other blocks, the successors of a switch are listed uniquely.
   };
 private:
   // A mapping from pre_order to Blocks.  This array is created
   // only at the end of the flow.
   Block** _block_map;
   // For each ciBlock index, a list of Blocks which share this ciBlock.
   GrowableArray<Block*>** _idx_to_blocklist;
   // count of ciBlocks
   int _ciblock_count;
   // Tells if a given instruction is able to generate an exception edge.
   bool can_trap(ciBytecodeStream& str);
 public:
   // Return the block beginning at bci which has a JsrSet compatible
   // with jsrs.
   Block* block_at(int bci, JsrSet* set, CreateOption option = create_public_copy);
   // block factory
   Block* get_block_for(int ciBlockIndex, JsrSet* jsrs, CreateOption option = create_public_copy);
   // How many of the blocks have the private_copy bit set?
   int private_copy_count(int ciBlockIndex, JsrSet* jsrs) const;
   // Return an existing block containing bci which has a JsrSet compatible
   // with jsrs, or NULL if there is none.
   Block* existing_block_at(int bci, JsrSet* set) { return block_at(bci, set, no_create); }
   // Tell whether the flow analysis has encountered an error of some sort.
   bool failing() { return env()->failing() || _failure_reason != NULL; }
   // Reason this compilation is failing, such as "too many basic blocks".
   const char* failure_reason() { return _failure_reason; }
   // Note a failure.
   void record_failure(const char* reason);
   // Return the block of a given pre-order number.
   int have_block_count() const      { return _block_map != NULL; }
   int block_count() const           { assert(have_block_count(), "");
                                       return _next_pre_order; }
   Block* pre_order_at(int po) const { assert(0 <= po && po < block_count(), "out of bounds");
                                       return _block_map[po]; }
   Block* start_block() const        { return pre_order_at(start_block_num()); }
   int start_block_num() const       { return 0; }
 private:
   // A work list used during flow analysis.
   Block* _work_list;
   // Next Block::_pre_order.  After mapping, doubles as block_count.
   int _next_pre_order;
   // Are there more blocks on the work list?
   bool work_list_empty() { return _work_list == NULL; }
   // Get the next basic block from our work list.
   Block* work_list_next();
   // Add a basic block to our work list.
   void add_to_work_list(Block* block);
   // State used for make_jsr_record
   int _jsr_count;
   GrowableArray<JsrRecord*>* _jsr_records;
 public:
   // Make a JsrRecord for a given (entry, return) pair, if such a record
   // does not already exist.
   JsrRecord* make_jsr_record(int entry_address, int return_address);
 private:
   // Get the initial state for start_bci:
   const StateVector* get_start_state();
   // Merge the current state into all exceptional successors at the
   // current point in the code.
   void flow_exceptions(GrowableArray<Block*>* exceptions,
                        GrowableArray<ciInstanceKlass*>* exc_klasses,
                        StateVector* state);
   // Merge the current state into all successors at the current point
   // in the code.
   void flow_successors(GrowableArray<Block*>* successors,
                        StateVector* state);
   // Interpret the effects of the bytecodes on the incoming state
   // vector of a basic block.  Push the changed state to succeeding
   // basic blocks.
   void flow_block(Block* block,
                   StateVector* scratch_state,
                   JsrSet* scratch_jsrs);
   // Perform the type flow analysis, creating and cloning Blocks as
   // necessary.
   void flow_types();
   // Create the block map, which indexes blocks in pre_order.
   void map_blocks();
 public:
   // Perform type inference flow analysis.
   void do_flow();
   void print_on(outputStream* st) const PRODUCT_RETURN;
 };

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/ci/ciTypeFlow.hpp@a61af66fc99e (annotated)

src/share/vm/ci/ciTypeFlow.hpp