jdk8-mips64-public/hotspot: src/share/vm/c1/c1_GraphBuilder.cpp@8012aa3ccede (annotated)

src/share/vm/c1/c1_GraphBuilder.cpp@8012aa3ccede (annotated)

src/share/vm/c1/c1_GraphBuilder.cpp

Thu, 13 Jan 2011 22:15:41 -0800

author: never
date: Thu, 13 Jan 2011 22:15:41 -0800
changeset 2462: 8012aa3ccede
parent 2349: 5ddfcf4b079e
child 2487: aa4b04b68652
permissions: -rw-r--r--

4926272: methodOopDesc::method_from_bcp is unsafe
Reviewed-by: coleenp, jrose, kvn, dcubed

 /*
  * Copyright (c) 1999, 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
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "c1/c1_CFGPrinter.hpp"
 #include "c1/c1_Canonicalizer.hpp"
 #include "c1/c1_Compilation.hpp"
 #include "c1/c1_GraphBuilder.hpp"
 #include "c1/c1_InstructionPrinter.hpp"
 #include "ci/ciField.hpp"
 #include "ci/ciKlass.hpp"
 #include "interpreter/bytecode.hpp"
 #include "runtime/sharedRuntime.hpp"
 #include "utilities/bitMap.inline.hpp"
 class BlockListBuilder VALUE_OBJ_CLASS_SPEC {
  private:
   Compilation* _compilation;
   IRScope*     _scope;
   BlockList    _blocks;                // internal list of all blocks
   BlockList*   _bci2block;             // mapping from bci to blocks for GraphBuilder
   // fields used by mark_loops
   BitMap       _active;                // for iteration of control flow graph
   BitMap       _visited;               // for iteration of control flow graph
   intArray     _loop_map;              // caches the information if a block is contained in a loop
   int          _next_loop_index;       // next free loop number
   int          _next_block_number;     // for reverse postorder numbering of blocks
   // accessors
   Compilation*  compilation() const              { return _compilation; }
   IRScope*      scope() const                    { return _scope; }
   ciMethod*     method() const                   { return scope()->method(); }
   XHandlers*    xhandlers() const                { return scope()->xhandlers(); }
   // unified bailout support
   void          bailout(const char* msg) const   { compilation()->bailout(msg); }
   bool          bailed_out() const               { return compilation()->bailed_out(); }
   // helper functions
   BlockBegin* make_block_at(int bci, BlockBegin* predecessor);
   void handle_exceptions(BlockBegin* current, int cur_bci);
   void handle_jsr(BlockBegin* current, int sr_bci, int next_bci);
   void store_one(BlockBegin* current, int local);
   void store_two(BlockBegin* current, int local);
   void set_entries(int osr_bci);
   void set_leaders();
   void make_loop_header(BlockBegin* block);
   void mark_loops();
   int  mark_loops(BlockBegin* b, bool in_subroutine);
   // debugging
 #ifndef PRODUCT
   void print();
 #endif
  public:
   // creation
   BlockListBuilder(Compilation* compilation, IRScope* scope, int osr_bci);
   // accessors for GraphBuilder
   BlockList*    bci2block() const                { return _bci2block; }
 };
 // Implementation of BlockListBuilder
 BlockListBuilder::BlockListBuilder(Compilation* compilation, IRScope* scope, int osr_bci)
  : _compilation(compilation)
  , _scope(scope)
  , _blocks(16)
  , _bci2block(new BlockList(scope->method()->code_size(), NULL))
  , _next_block_number(0)
  , _active()         // size not known yet
  , _visited()        // size not known yet
  , _next_loop_index(0)
  , _loop_map() // size not known yet
 {
   set_entries(osr_bci);
   set_leaders();
   CHECK_BAILOUT();
   mark_loops();
   NOT_PRODUCT(if (PrintInitialBlockList) print());
 #ifndef PRODUCT
   if (PrintCFGToFile) {
     stringStream title;
     title.print("BlockListBuilder ");
     scope->method()->print_name(&title);
     CFGPrinter::print_cfg(_bci2block, title.as_string(), false, false);
   }
 #endif
 }
 void BlockListBuilder::set_entries(int osr_bci) {
   // generate start blocks
   BlockBegin* std_entry = make_block_at(0, NULL);
   if (scope()->caller() == NULL) {
     std_entry->set(BlockBegin::std_entry_flag);
   }
   if (osr_bci != -1) {
     BlockBegin* osr_entry = make_block_at(osr_bci, NULL);
     osr_entry->set(BlockBegin::osr_entry_flag);
   }
   // generate exception entry blocks
   XHandlers* list = xhandlers();
   const int n = list->length();
   for (int i = 0; i < n; i++) {
     XHandler* h = list->handler_at(i);
     BlockBegin* entry = make_block_at(h->handler_bci(), NULL);
     entry->set(BlockBegin::exception_entry_flag);
     h->set_entry_block(entry);
   }
 }
 BlockBegin* BlockListBuilder::make_block_at(int cur_bci, BlockBegin* predecessor) {
   assert(method()->bci_block_start().at(cur_bci), "wrong block starts of MethodLivenessAnalyzer");
   BlockBegin* block = _bci2block->at(cur_bci);
   if (block == NULL) {
     block = new BlockBegin(cur_bci);
     block->init_stores_to_locals(method()->max_locals());
     _bci2block->at_put(cur_bci, block);
     _blocks.append(block);
     assert(predecessor == NULL || predecessor->bci() < cur_bci, "targets for backward branches must already exist");
   }
   if (predecessor != NULL) {
     if (block->is_set(BlockBegin::exception_entry_flag)) {
       BAILOUT_("Exception handler can be reached by both normal and exceptional control flow", block);
     }
     predecessor->add_successor(block);
     block->increment_total_preds();
   }
   return block;
 }
 inline void BlockListBuilder::store_one(BlockBegin* current, int local) {
   current->stores_to_locals().set_bit(local);
 }
 inline void BlockListBuilder::store_two(BlockBegin* current, int local) {
   store_one(current, local);
   store_one(current, local + 1);
 }
 void BlockListBuilder::handle_exceptions(BlockBegin* current, int cur_bci) {
   // Draws edges from a block to its exception handlers
   XHandlers* list = xhandlers();
   const int n = list->length();
   for (int i = 0; i < n; i++) {
     XHandler* h = list->handler_at(i);
     if (h->covers(cur_bci)) {
       BlockBegin* entry = h->entry_block();
       assert(entry != NULL && entry == _bci2block->at(h->handler_bci()), "entry must be set");
       assert(entry->is_set(BlockBegin::exception_entry_flag), "flag must be set");
       // add each exception handler only once
       if (!current->is_successor(entry)) {
         current->add_successor(entry);
         entry->increment_total_preds();
       }
       // stop when reaching catchall
       if (h->catch_type() == 0) break;
     }
   }
 }
 void BlockListBuilder::handle_jsr(BlockBegin* current, int sr_bci, int next_bci) {
   // start a new block after jsr-bytecode and link this block into cfg
   make_block_at(next_bci, current);
   // start a new block at the subroutine entry at mark it with special flag
   BlockBegin* sr_block = make_block_at(sr_bci, current);
   if (!sr_block->is_set(BlockBegin::subroutine_entry_flag)) {
     sr_block->set(BlockBegin::subroutine_entry_flag);
   }
 }
 void BlockListBuilder::set_leaders() {
   bool has_xhandlers = xhandlers()->has_handlers();
   BlockBegin* current = NULL;
   // The information which bci starts a new block simplifies the analysis
   // Without it, backward branches could jump to a bci where no block was created
   // during bytecode iteration. This would require the creation of a new block at the
   // branch target and a modification of the successor lists.
   BitMap bci_block_start = method()->bci_block_start();
   ciBytecodeStream s(method());
   while (s.next() != ciBytecodeStream::EOBC()) {
     int cur_bci = s.cur_bci();
     if (bci_block_start.at(cur_bci)) {
       current = make_block_at(cur_bci, current);
     }
     assert(current != NULL, "must have current block");
     if (has_xhandlers && GraphBuilder::can_trap(method(), s.cur_bc())) {
       handle_exceptions(current, cur_bci);
     }
     switch (s.cur_bc()) {
       // track stores to local variables for selective creation of phi functions
       case Bytecodes::_iinc:     store_one(current, s.get_index()); break;
       case Bytecodes::_istore:   store_one(current, s.get_index()); break;
       case Bytecodes::_lstore:   store_two(current, s.get_index()); break;
       case Bytecodes::_fstore:   store_one(current, s.get_index()); break;
       case Bytecodes::_dstore:   store_two(current, s.get_index()); break;
       case Bytecodes::_astore:   store_one(current, s.get_index()); break;
       case Bytecodes::_istore_0: store_one(current, 0); break;
       case Bytecodes::_istore_1: store_one(current, 1); break;
       case Bytecodes::_istore_2: store_one(current, 2); break;
       case Bytecodes::_istore_3: store_one(current, 3); break;
       case Bytecodes::_lstore_0: store_two(current, 0); break;
       case Bytecodes::_lstore_1: store_two(current, 1); break;
       case Bytecodes::_lstore_2: store_two(current, 2); break;
       case Bytecodes::_lstore_3: store_two(current, 3); break;
       case Bytecodes::_fstore_0: store_one(current, 0); break;
       case Bytecodes::_fstore_1: store_one(current, 1); break;
       case Bytecodes::_fstore_2: store_one(current, 2); break;
       case Bytecodes::_fstore_3: store_one(current, 3); break;
       case Bytecodes::_dstore_0: store_two(current, 0); break;
       case Bytecodes::_dstore_1: store_two(current, 1); break;
       case Bytecodes::_dstore_2: store_two(current, 2); break;
       case Bytecodes::_dstore_3: store_two(current, 3); break;
       case Bytecodes::_astore_0: store_one(current, 0); break;
       case Bytecodes::_astore_1: store_one(current, 1); break;
       case Bytecodes::_astore_2: store_one(current, 2); break;
       case Bytecodes::_astore_3: store_one(current, 3); break;
       // track bytecodes that affect the control flow
       case Bytecodes::_athrow:  // fall through
       case Bytecodes::_ret:     // fall through
       case Bytecodes::_ireturn: // fall through
       case Bytecodes::_lreturn: // fall through
       case Bytecodes::_freturn: // fall through
       case Bytecodes::_dreturn: // fall through
       case Bytecodes::_areturn: // fall through
       case Bytecodes::_return:
         current = NULL;
         break;
       case Bytecodes::_ifeq:      // fall through
       case Bytecodes::_ifne:      // fall through
       case Bytecodes::_iflt:      // fall through
       case Bytecodes::_ifge:      // fall through
       case Bytecodes::_ifgt:      // fall through
       case Bytecodes::_ifle:      // fall through
       case Bytecodes::_if_icmpeq: // fall through
       case Bytecodes::_if_icmpne: // fall through
       case Bytecodes::_if_icmplt: // fall through
       case Bytecodes::_if_icmpge: // fall through
       case Bytecodes::_if_icmpgt: // fall through
       case Bytecodes::_if_icmple: // fall through
       case Bytecodes::_if_acmpeq: // fall through
       case Bytecodes::_if_acmpne: // fall through
       case Bytecodes::_ifnull:    // fall through
       case Bytecodes::_ifnonnull:
         make_block_at(s.next_bci(), current);
         make_block_at(s.get_dest(), current);
         current = NULL;
         break;
       case Bytecodes::_goto:
         make_block_at(s.get_dest(), current);
         current = NULL;
         break;
       case Bytecodes::_goto_w:
         make_block_at(s.get_far_dest(), current);
         current = NULL;
         break;
       case Bytecodes::_jsr:
         handle_jsr(current, s.get_dest(), s.next_bci());
         current = NULL;
         break;
       case Bytecodes::_jsr_w:
         handle_jsr(current, s.get_far_dest(), s.next_bci());
         current = NULL;
         break;
       case Bytecodes::_tableswitch: {
         // set block for each case
         Bytecode_tableswitch sw(&s);
         int l = sw.length();
         for (int i = 0; i < l; i++) {
           make_block_at(cur_bci + sw.dest_offset_at(i), current);
         }
         make_block_at(cur_bci + sw.default_offset(), current);
         current = NULL;
         break;
       }
       case Bytecodes::_lookupswitch: {
         // set block for each case
         Bytecode_lookupswitch sw(&s);
         int l = sw.number_of_pairs();
         for (int i = 0; i < l; i++) {
           make_block_at(cur_bci + sw.pair_at(i).offset(), current);
         }
         make_block_at(cur_bci + sw.default_offset(), current);
         current = NULL;
         break;
       }
     }
   }
 }
 void BlockListBuilder::mark_loops() {
   ResourceMark rm;
   _active = BitMap(BlockBegin::number_of_blocks());         _active.clear();
   _visited = BitMap(BlockBegin::number_of_blocks());        _visited.clear();
   _loop_map = intArray(BlockBegin::number_of_blocks(), 0);
   _next_loop_index = 0;
   _next_block_number = _blocks.length();
   // recursively iterate the control flow graph
   mark_loops(_bci2block->at(0), false);
   assert(_next_block_number >= 0, "invalid block numbers");
 }
 void BlockListBuilder::make_loop_header(BlockBegin* block) {
   if (block->is_set(BlockBegin::exception_entry_flag)) {
     // exception edges may look like loops but don't mark them as such
     // since it screws up block ordering.
     return;
   }
   if (!block->is_set(BlockBegin::parser_loop_header_flag)) {
     block->set(BlockBegin::parser_loop_header_flag);
     assert(_loop_map.at(block->block_id()) == 0, "must not be set yet");
     assert(0 <= _next_loop_index && _next_loop_index < BitsPerInt, "_next_loop_index is used as a bit-index in integer");
     _loop_map.at_put(block->block_id(), 1 << _next_loop_index);
     if (_next_loop_index < 31) _next_loop_index++;
   } else {
     // block already marked as loop header
     assert(is_power_of_2((unsigned int)_loop_map.at(block->block_id())), "exactly one bit must be set");
   }
 }
 int BlockListBuilder::mark_loops(BlockBegin* block, bool in_subroutine) {
   int block_id = block->block_id();
   if (_visited.at(block_id)) {
     if (_active.at(block_id)) {
       // reached block via backward branch
       make_loop_header(block);
     }
     // return cached loop information for this block
     return _loop_map.at(block_id);
   }
   if (block->is_set(BlockBegin::subroutine_entry_flag)) {
     in_subroutine = true;
   }
   // set active and visited bits before successors are processed
   _visited.set_bit(block_id);
   _active.set_bit(block_id);
   intptr_t loop_state = 0;
   for (int i = block->number_of_sux() - 1; i >= 0; i--) {
     // recursively process all successors
     loop_state |= mark_loops(block->sux_at(i), in_subroutine);
   }
   // clear active-bit after all successors are processed
   _active.clear_bit(block_id);
   // reverse-post-order numbering of all blocks
   block->set_depth_first_number(_next_block_number);
   _next_block_number--;
   if (loop_state != 0 || in_subroutine ) {
     // block is contained at least in one loop, so phi functions are necessary
     // phi functions are also necessary for all locals stored in a subroutine
     scope()->requires_phi_function().set_union(block->stores_to_locals());
   }
   if (block->is_set(BlockBegin::parser_loop_header_flag)) {
     int header_loop_state = _loop_map.at(block_id);
     assert(is_power_of_2((unsigned)header_loop_state), "exactly one bit must be set");
     // If the highest bit is set (i.e. when integer value is negative), the method
     // has 32 or more loops. This bit is never cleared because it is used for multiple loops
     if (header_loop_state >= 0) {
       clear_bits(loop_state, header_loop_state);
     }
   }
   // cache and return loop information for this block
   _loop_map.at_put(block_id, loop_state);
   return loop_state;
 }
 #ifndef PRODUCT
 int compare_depth_first(BlockBegin** a, BlockBegin** b) {
   return (*a)->depth_first_number() - (*b)->depth_first_number();
 }
 void BlockListBuilder::print() {
   tty->print("----- initial block list of BlockListBuilder for method ");
   method()->print_short_name();
   tty->cr();
   // better readability if blocks are sorted in processing order
   _blocks.sort(compare_depth_first);
   for (int i = 0; i < _blocks.length(); i++) {
     BlockBegin* cur = _blocks.at(i);
     tty->print("%4d: B%-4d bci: %-4d  preds: %-4d ", cur->depth_first_number(), cur->block_id(), cur->bci(), cur->total_preds());
     tty->print(cur->is_set(BlockBegin::std_entry_flag)               ? " std" : "    ");
     tty->print(cur->is_set(BlockBegin::osr_entry_flag)               ? " osr" : "    ");
     tty->print(cur->is_set(BlockBegin::exception_entry_flag)         ? " ex" : "   ");
     tty->print(cur->is_set(BlockBegin::subroutine_entry_flag)        ? " sr" : "   ");
     tty->print(cur->is_set(BlockBegin::parser_loop_header_flag)      ? " lh" : "   ");
     if (cur->number_of_sux() > 0) {
       tty->print("    sux: ");
       for (int j = 0; j < cur->number_of_sux(); j++) {
         BlockBegin* sux = cur->sux_at(j);
         tty->print("B%d ", sux->block_id());
       }
     }
     tty->cr();
   }
 }
 #endif
 // A simple growable array of Values indexed by ciFields
 class FieldBuffer: public CompilationResourceObj {
  private:
   GrowableArray<Value> _values;
  public:
   FieldBuffer() {}
   void kill() {
     _values.trunc_to(0);
   }
   Value at(ciField* field) {
     assert(field->holder()->is_loaded(), "must be a loaded field");
     int offset = field->offset();
     if (offset < _values.length()) {
       return _values.at(offset);
     } else {
       return NULL;
     }
   }
   void at_put(ciField* field, Value value) {
     assert(field->holder()->is_loaded(), "must be a loaded field");
     int offset = field->offset();
     _values.at_put_grow(offset, value, NULL);
   }
 };
 // MemoryBuffer is fairly simple model of the current state of memory.
 // It partitions memory into several pieces.  The first piece is
 // generic memory where little is known about the owner of the memory.
 // This is conceptually represented by the tuple <O, F, V> which says
 // that the field F of object O has value V.  This is flattened so
 // that F is represented by the offset of the field and the parallel
 // arrays _objects and _values are used for O and V.  Loads of O.F can
 // simply use V.  Newly allocated objects are kept in a separate list
 // along with a parallel array for each object which represents the
 // current value of its fields.  Stores of the default value to fields
 // which have never been stored to before are eliminated since they
 // are redundant.  Once newly allocated objects are stored into
 // another object or they are passed out of the current compile they
 // are treated like generic memory.
 class MemoryBuffer: public CompilationResourceObj {
  private:
   FieldBuffer                 _values;
   GrowableArray<Value>        _objects;
   GrowableArray<Value>        _newobjects;
   GrowableArray<FieldBuffer*> _fields;
  public:
   MemoryBuffer() {}
   StoreField* store(StoreField* st) {
     if (!EliminateFieldAccess) {
       return st;
     }
     Value object = st->obj();
     Value value = st->value();
     ciField* field = st->field();
     if (field->holder()->is_loaded()) {
       int offset = field->offset();
       int index = _newobjects.find(object);
       if (index != -1) {
         // newly allocated object with no other stores performed on this field
         FieldBuffer* buf = _fields.at(index);
         if (buf->at(field) == NULL && is_default_value(value)) {
 #ifndef PRODUCT
           if (PrintIRDuringConstruction && Verbose) {
             tty->print_cr("Eliminated store for object %d:", index);
             st->print_line();
           }
 #endif
           return NULL;
         } else {
           buf->at_put(field, value);
         }
       } else {
         _objects.at_put_grow(offset, object, NULL);
         _values.at_put(field, value);
       }
       store_value(value);
     } else {
       // if we held onto field names we could alias based on names but
       // we don't know what's being stored to so kill it all.
       kill();
     }
     return st;
   }
   // return true if this value correspond to the default value of a field.
   bool is_default_value(Value value) {
     Constant* con = value->as_Constant();
     if (con) {
       switch (con->type()->tag()) {
         case intTag:    return con->type()->as_IntConstant()->value() == 0;
         case longTag:   return con->type()->as_LongConstant()->value() == 0;
         case floatTag:  return jint_cast(con->type()->as_FloatConstant()->value()) == 0;
         case doubleTag: return jlong_cast(con->type()->as_DoubleConstant()->value()) == jlong_cast(0);
         case objectTag: return con->type() == objectNull;
         default:  ShouldNotReachHere();
       }
     }
     return false;
   }
   // return either the actual value of a load or the load itself
   Value load(LoadField* load) {
     if (!EliminateFieldAccess) {
       return load;
     }
     if (RoundFPResults && UseSSE < 2 && load->type()->is_float_kind()) {
       // can't skip load since value might get rounded as a side effect
       return load;
     }
     ciField* field = load->field();
     Value object   = load->obj();
     if (field->holder()->is_loaded() && !field->is_volatile()) {
       int offset = field->offset();
       Value result = NULL;
       int index = _newobjects.find(object);
       if (index != -1) {
         result = _fields.at(index)->at(field);
       } else if (_objects.at_grow(offset, NULL) == object) {
         result = _values.at(field);
       }
       if (result != NULL) {
 #ifndef PRODUCT
         if (PrintIRDuringConstruction && Verbose) {
           tty->print_cr("Eliminated load: ");
           load->print_line();
         }
 #endif
         assert(result->type()->tag() == load->type()->tag(), "wrong types");
         return result;
       }
     }
     return load;
   }
   // Record this newly allocated object
   void new_instance(NewInstance* object) {
     int index = _newobjects.length();
     _newobjects.append(object);
     if (_fields.at_grow(index, NULL) == NULL) {
       _fields.at_put(index, new FieldBuffer());
     } else {
       _fields.at(index)->kill();
     }
   }
   void store_value(Value value) {
     int index = _newobjects.find(value);
     if (index != -1) {
       // stored a newly allocated object into another object.
       // Assume we've lost track of it as separate slice of memory.
       // We could do better by keeping track of whether individual
       // fields could alias each other.
       _newobjects.remove_at(index);
       // pull out the field info and store it at the end up the list
       // of field info list to be reused later.
       _fields.append(_fields.at(index));
       _fields.remove_at(index);
     }
   }
   void kill() {
     _newobjects.trunc_to(0);
     _objects.trunc_to(0);
     _values.kill();
   }
 };
 // Implementation of GraphBuilder's ScopeData
 GraphBuilder::ScopeData::ScopeData(ScopeData* parent)
   : _parent(parent)
   , _bci2block(NULL)
   , _scope(NULL)
   , _has_handler(false)
   , _stream(NULL)
   , _work_list(NULL)
   , _parsing_jsr(false)
   , _jsr_xhandlers(NULL)
   , _caller_stack_size(-1)
   , _continuation(NULL)
   , _num_returns(0)
   , _cleanup_block(NULL)
   , _cleanup_return_prev(NULL)
   , _cleanup_state(NULL)
 {
   if (parent != NULL) {
     _max_inline_size = (intx) ((float) NestedInliningSizeRatio * (float) parent->max_inline_size() / 100.0f);
   } else {
     _max_inline_size = MaxInlineSize;
   }
   if (_max_inline_size < MaxTrivialSize) {
     _max_inline_size = MaxTrivialSize;
   }
 }
 void GraphBuilder::kill_all() {
   if (UseLocalValueNumbering) {
     vmap()->kill_all();
   }
   _memory->kill();
 }
 BlockBegin* GraphBuilder::ScopeData::block_at(int bci) {
   if (parsing_jsr()) {
     // It is necessary to clone all blocks associated with a
     // subroutine, including those for exception handlers in the scope
     // of the method containing the jsr (because those exception
     // handlers may contain ret instructions in some cases).
     BlockBegin* block = bci2block()->at(bci);
     if (block != NULL && block == parent()->bci2block()->at(bci)) {
       BlockBegin* new_block = new BlockBegin(block->bci());
 #ifndef PRODUCT
       if (PrintInitialBlockList) {
         tty->print_cr("CFG: cloned block %d (bci %d) as block %d for jsr",
                       block->block_id(), block->bci(), new_block->block_id());
       }
 #endif
       // copy data from cloned blocked
       new_block->set_depth_first_number(block->depth_first_number());
       if (block->is_set(BlockBegin::parser_loop_header_flag)) new_block->set(BlockBegin::parser_loop_header_flag);
       // Preserve certain flags for assertion checking
       if (block->is_set(BlockBegin::subroutine_entry_flag)) new_block->set(BlockBegin::subroutine_entry_flag);
       if (block->is_set(BlockBegin::exception_entry_flag))  new_block->set(BlockBegin::exception_entry_flag);
       // copy was_visited_flag to allow early detection of bailouts
       // if a block that is used in a jsr has already been visited before,
       // it is shared between the normal control flow and a subroutine
       // BlockBegin::try_merge returns false when the flag is set, this leads
       // to a compilation bailout
       if (block->is_set(BlockBegin::was_visited_flag))  new_block->set(BlockBegin::was_visited_flag);
       bci2block()->at_put(bci, new_block);
       block = new_block;
     }
     return block;
   } else {
     return bci2block()->at(bci);
   }
 }
 XHandlers* GraphBuilder::ScopeData::xhandlers() const {
   if (_jsr_xhandlers == NULL) {
     assert(!parsing_jsr(), "");
     return scope()->xhandlers();
   }
   assert(parsing_jsr(), "");
   return _jsr_xhandlers;
 }
 void GraphBuilder::ScopeData::set_scope(IRScope* scope) {
   _scope = scope;
   bool parent_has_handler = false;
   if (parent() != NULL) {
     parent_has_handler = parent()->has_handler();
   }
   _has_handler = parent_has_handler || scope->xhandlers()->has_handlers();
 }
 void GraphBuilder::ScopeData::set_inline_cleanup_info(BlockBegin* block,
                                                       Instruction* return_prev,
                                                       ValueStack* return_state) {
   _cleanup_block       = block;
   _cleanup_return_prev = return_prev;
   _cleanup_state       = return_state;
 }
 void GraphBuilder::ScopeData::add_to_work_list(BlockBegin* block) {
   if (_work_list == NULL) {
     _work_list = new BlockList();
   }
   if (!block->is_set(BlockBegin::is_on_work_list_flag)) {
     // Do not start parsing the continuation block while in a
     // sub-scope
     if (parsing_jsr()) {
       if (block == jsr_continuation()) {
         return;
       }
     } else {
       if (block == continuation()) {
         return;
       }
     }
     block->set(BlockBegin::is_on_work_list_flag);
     _work_list->push(block);
     sort_top_into_worklist(_work_list, block);
   }
 }
 void GraphBuilder::sort_top_into_worklist(BlockList* worklist, BlockBegin* top) {
   assert(worklist->top() == top, "");
   // sort block descending into work list
   const int dfn = top->depth_first_number();
   assert(dfn != -1, "unknown depth first number");
   int i = worklist->length()-2;
   while (i >= 0) {
     BlockBegin* b = worklist->at(i);
     if (b->depth_first_number() < dfn) {
       worklist->at_put(i+1, b);
     } else {
       break;
     }
     i --;
   }
   if (i >= -1) worklist->at_put(i + 1, top);
 }
 BlockBegin* GraphBuilder::ScopeData::remove_from_work_list() {
   if (is_work_list_empty()) {
     return NULL;
   }
   return _work_list->pop();
 }
 bool GraphBuilder::ScopeData::is_work_list_empty() const {
   return (_work_list == NULL || _work_list->length() == 0);
 }
 void GraphBuilder::ScopeData::setup_jsr_xhandlers() {
   assert(parsing_jsr(), "");
   // clone all the exception handlers from the scope
   XHandlers* handlers = new XHandlers(scope()->xhandlers());
   const int n = handlers->length();
   for (int i = 0; i < n; i++) {
     // The XHandlers need to be adjusted to dispatch to the cloned
     // handler block instead of the default one but the synthetic
     // unlocker needs to be handled specially.  The synthetic unlocker
     // should be left alone since there can be only one and all code
     // should dispatch to the same one.
     XHandler* h = handlers->handler_at(i);
     assert(h->handler_bci() != SynchronizationEntryBCI, "must be real");
     h->set_entry_block(block_at(h->handler_bci()));
   }
   _jsr_xhandlers = handlers;
 }
 int GraphBuilder::ScopeData::num_returns() {
   if (parsing_jsr()) {
     return parent()->num_returns();
   }
   return _num_returns;
 }
 void GraphBuilder::ScopeData::incr_num_returns() {
   if (parsing_jsr()) {
     parent()->incr_num_returns();
   } else {
     ++_num_returns;
   }
 }
 // Implementation of GraphBuilder
 #define INLINE_BAILOUT(msg)        { inline_bailout(msg); return false; }
 void GraphBuilder::load_constant() {
   ciConstant con = stream()->get_constant();
   if (con.basic_type() == T_ILLEGAL) {
     BAILOUT("could not resolve a constant");
   } else {
     ValueType* t = illegalType;
     ValueStack* patch_state = NULL;
     switch (con.basic_type()) {
       case T_BOOLEAN: t = new IntConstant     (con.as_boolean()); break;
       case T_BYTE   : t = new IntConstant     (con.as_byte   ()); break;
       case T_CHAR   : t = new IntConstant     (con.as_char   ()); break;
       case T_SHORT  : t = new IntConstant     (con.as_short  ()); break;
       case T_INT    : t = new IntConstant     (con.as_int    ()); break;
       case T_LONG   : t = new LongConstant    (con.as_long   ()); break;
       case T_FLOAT  : t = new FloatConstant   (con.as_float  ()); break;
       case T_DOUBLE : t = new DoubleConstant  (con.as_double ()); break;
       case T_ARRAY  : t = new ArrayConstant   (con.as_object ()->as_array   ()); break;
       case T_OBJECT :
        {
         ciObject* obj = con.as_object();
         if (!obj->is_loaded()
             || (PatchALot && obj->klass() != ciEnv::current()->String_klass())) {
           patch_state = copy_state_before();
           t = new ObjectConstant(obj);
         } else {
           assert(!obj->is_klass(), "must be java_mirror of klass");
           t = new InstanceConstant(obj->as_instance());
         }
         break;
        }
       default       : ShouldNotReachHere();
     }
     Value x;
     if (patch_state != NULL) {
       x = new Constant(t, patch_state);
     } else {
       x = new Constant(t);
     }
     push(t, append(x));
   }
 }
 void GraphBuilder::load_local(ValueType* type, int index) {
   Value x = state()->local_at(index);
   assert(x != NULL && !x->type()->is_illegal(), "access of illegal local variable");
   push(type, x);
 }
 void GraphBuilder::store_local(ValueType* type, int index) {
   Value x = pop(type);
   store_local(state(), x, type, index);
 }
 void GraphBuilder::store_local(ValueStack* state, Value x, ValueType* type, int index) {
   if (parsing_jsr()) {
     // We need to do additional tracking of the location of the return
     // address for jsrs since we don't handle arbitrary jsr/ret
     // constructs. Here we are figuring out in which circumstances we
     // need to bail out.
     if (x->type()->is_address()) {
       scope_data()->set_jsr_return_address_local(index);
       // Also check parent jsrs (if any) at this time to see whether
       // they are using this local. We don't handle skipping over a
       // ret.
       for (ScopeData* cur_scope_data = scope_data()->parent();
            cur_scope_data != NULL && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope();
            cur_scope_data = cur_scope_data->parent()) {
         if (cur_scope_data->jsr_return_address_local() == index) {
           BAILOUT("subroutine overwrites return address from previous subroutine");
         }
       }
     } else if (index == scope_data()->jsr_return_address_local()) {
       scope_data()->set_jsr_return_address_local(-1);
     }
   }
   state->store_local(index, round_fp(x));
 }
 void GraphBuilder::load_indexed(BasicType type) {
   ValueStack* state_before = copy_state_for_exception();
   Value index = ipop();
   Value array = apop();
   Value length = NULL;
   if (CSEArrayLength ||
       (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) ||
       (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant())) {
     length = append(new ArrayLength(array, state_before));
   }
   push(as_ValueType(type), append(new LoadIndexed(array, index, length, type, state_before)));
 }
 void GraphBuilder::store_indexed(BasicType type) {
   ValueStack* state_before = copy_state_for_exception();
   Value value = pop(as_ValueType(type));
   Value index = ipop();
   Value array = apop();
   Value length = NULL;
   if (CSEArrayLength ||
       (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) ||
       (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant())) {
     length = append(new ArrayLength(array, state_before));
   }
   StoreIndexed* result = new StoreIndexed(array, index, length, type, value, state_before);
   append(result);
   _memory->store_value(value);
   if (type == T_OBJECT && is_profiling()) {
     // Note that we'd collect profile data in this method if we wanted it.
     compilation()->set_would_profile(true);
     if (profile_checkcasts()) {
       result->set_profiled_method(method());
       result->set_profiled_bci(bci());
       result->set_should_profile(true);
     }
   }
 }
 void GraphBuilder::stack_op(Bytecodes::Code code) {
   switch (code) {
     case Bytecodes::_pop:
       { state()->raw_pop();
       }
       break;
     case Bytecodes::_pop2:
       { state()->raw_pop();
         state()->raw_pop();
       }
       break;
     case Bytecodes::_dup:
       { Value w = state()->raw_pop();
         state()->raw_push(w);
         state()->raw_push(w);
       }
       break;
     case Bytecodes::_dup_x1:
       { Value w1 = state()->raw_pop();
         Value w2 = state()->raw_pop();
         state()->raw_push(w1);
         state()->raw_push(w2);
         state()->raw_push(w1);
       }
       break;
     case Bytecodes::_dup_x2:
       { Value w1 = state()->raw_pop();
         Value w2 = state()->raw_pop();
         Value w3 = state()->raw_pop();
         state()->raw_push(w1);
         state()->raw_push(w3);
         state()->raw_push(w2);
         state()->raw_push(w1);
       }
       break;
     case Bytecodes::_dup2:
       { Value w1 = state()->raw_pop();
         Value w2 = state()->raw_pop();
         state()->raw_push(w2);
         state()->raw_push(w1);
         state()->raw_push(w2);
         state()->raw_push(w1);
       }
       break;
     case Bytecodes::_dup2_x1:
       { Value w1 = state()->raw_pop();
         Value w2 = state()->raw_pop();
         Value w3 = state()->raw_pop();
         state()->raw_push(w2);
         state()->raw_push(w1);
         state()->raw_push(w3);
         state()->raw_push(w2);
         state()->raw_push(w1);
       }
       break;
     case Bytecodes::_dup2_x2:
       { Value w1 = state()->raw_pop();
         Value w2 = state()->raw_pop();
         Value w3 = state()->raw_pop();
         Value w4 = state()->raw_pop();
         state()->raw_push(w2);
         state()->raw_push(w1);
         state()->raw_push(w4);
         state()->raw_push(w3);
         state()->raw_push(w2);
         state()->raw_push(w1);
       }
       break;
     case Bytecodes::_swap:
       { Value w1 = state()->raw_pop();
         Value w2 = state()->raw_pop();
         state()->raw_push(w1);
         state()->raw_push(w2);
       }
       break;
     default:
       ShouldNotReachHere();
       break;
   }
 }
 void GraphBuilder::arithmetic_op(ValueType* type, Bytecodes::Code code, ValueStack* state_before) {
   Value y = pop(type);
   Value x = pop(type);
   // NOTE: strictfp can be queried from current method since we don't
   // inline methods with differing strictfp bits
   Value res = new ArithmeticOp(code, x, y, method()->is_strict(), state_before);
   // Note: currently single-precision floating-point rounding on Intel is handled at the LIRGenerator level
   res = append(res);
   if (method()->is_strict()) {
     res = round_fp(res);
   }
   push(type, res);
 }
 void GraphBuilder::negate_op(ValueType* type) {
   push(type, append(new NegateOp(pop(type))));
 }
 void GraphBuilder::shift_op(ValueType* type, Bytecodes::Code code) {
   Value s = ipop();
   Value x = pop(type);
   // try to simplify
   // Note: This code should go into the canonicalizer as soon as it can
   //       can handle canonicalized forms that contain more than one node.
   if (CanonicalizeNodes && code == Bytecodes::_iushr) {
     // pattern: x >>> s
     IntConstant* s1 = s->type()->as_IntConstant();
     if (s1 != NULL) {
       // pattern: x >>> s1, with s1 constant
       ShiftOp* l = x->as_ShiftOp();
       if (l != NULL && l->op() == Bytecodes::_ishl) {
         // pattern: (a << b) >>> s1
         IntConstant* s0 = l->y()->type()->as_IntConstant();
         if (s0 != NULL) {
           // pattern: (a << s0) >>> s1
           const int s0c = s0->value() & 0x1F; // only the low 5 bits are significant for shifts
           const int s1c = s1->value() & 0x1F; // only the low 5 bits are significant for shifts
           if (s0c == s1c) {
             if (s0c == 0) {
               // pattern: (a << 0) >>> 0 => simplify to: a
               ipush(l->x());
             } else {
               // pattern: (a << s0c) >>> s0c => simplify to: a & m, with m constant
               assert(0 < s0c && s0c < BitsPerInt, "adjust code below to handle corner cases");
               const int m = (1 << (BitsPerInt - s0c)) - 1;
               Value s = append(new Constant(new IntConstant(m)));
               ipush(append(new LogicOp(Bytecodes::_iand, l->x(), s)));
             }
             return;
           }
         }
       }
     }
   }
   // could not simplify
   push(type, append(new ShiftOp(code, x, s)));
 }
 void GraphBuilder::logic_op(ValueType* type, Bytecodes::Code code) {
   Value y = pop(type);
   Value x = pop(type);
   push(type, append(new LogicOp(code, x, y)));
 }
 void GraphBuilder::compare_op(ValueType* type, Bytecodes::Code code) {
   ValueStack* state_before = copy_state_before();
   Value y = pop(type);
   Value x = pop(type);
   ipush(append(new CompareOp(code, x, y, state_before)));
 }
 void GraphBuilder::convert(Bytecodes::Code op, BasicType from, BasicType to) {
   push(as_ValueType(to), append(new Convert(op, pop(as_ValueType(from)), as_ValueType(to))));
 }
 void GraphBuilder::increment() {
   int index = stream()->get_index();
   int delta = stream()->is_wide() ? (signed short)Bytes::get_Java_u2(stream()->cur_bcp() + 4) : (signed char)(stream()->cur_bcp()[2]);
   load_local(intType, index);
   ipush(append(new Constant(new IntConstant(delta))));
   arithmetic_op(intType, Bytecodes::_iadd);
   store_local(intType, index);
 }
 void GraphBuilder::_goto(int from_bci, int to_bci) {
   Goto *x = new Goto(block_at(to_bci), to_bci <= from_bci);
   if (is_profiling()) {
     compilation()->set_would_profile(true);
   }
   if (profile_branches()) {
     x->set_profiled_method(method());
     x->set_profiled_bci(bci());
     x->set_should_profile(true);
   }
   append(x);
 }
 void GraphBuilder::if_node(Value x, If::Condition cond, Value y, ValueStack* state_before) {
   BlockBegin* tsux = block_at(stream()->get_dest());
   BlockBegin* fsux = block_at(stream()->next_bci());
   bool is_bb = tsux->bci() < stream()->cur_bci() || fsux->bci() < stream()->cur_bci();
   Instruction *i = append(new If(x, cond, false, y, tsux, fsux, is_bb ? state_before : NULL, is_bb));
   if (is_profiling()) {
     If* if_node = i->as_If();
     if (if_node != NULL) {
       // Note that we'd collect profile data in this method if we wanted it.
       compilation()->set_would_profile(true);
       // At level 2 we need the proper bci to count backedges
       if_node->set_profiled_bci(bci());
       if (profile_branches()) {
         // Successors can be rotated by the canonicalizer, check for this case.
         if_node->set_profiled_method(method());
         if_node->set_should_profile(true);
         if (if_node->tsux() == fsux) {
           if_node->set_swapped(true);
         }
       }
       return;
     }
     // Check if this If was reduced to Goto.
     Goto *goto_node = i->as_Goto();
     if (goto_node != NULL) {
       compilation()->set_would_profile(true);
       if (profile_branches()) {
         goto_node->set_profiled_method(method());
         goto_node->set_profiled_bci(bci());
         goto_node->set_should_profile(true);
         // Find out which successor is used.
         if (goto_node->default_sux() == tsux) {
           goto_node->set_direction(Goto::taken);
         } else if (goto_node->default_sux() == fsux) {
           goto_node->set_direction(Goto::not_taken);
         } else {
           ShouldNotReachHere();
         }
       }
       return;
     }
   }
 }
 void GraphBuilder::if_zero(ValueType* type, If::Condition cond) {
   Value y = append(new Constant(intZero));
   ValueStack* state_before = copy_state_before();
   Value x = ipop();
   if_node(x, cond, y, state_before);
 }
 void GraphBuilder::if_null(ValueType* type, If::Condition cond) {
   Value y = append(new Constant(objectNull));
   ValueStack* state_before = copy_state_before();
   Value x = apop();
   if_node(x, cond, y, state_before);
 }
 void GraphBuilder::if_same(ValueType* type, If::Condition cond) {
   ValueStack* state_before = copy_state_before();
   Value y = pop(type);
   Value x = pop(type);
   if_node(x, cond, y, state_before);
 }
 void GraphBuilder::jsr(int dest) {
   // We only handle well-formed jsrs (those which are "block-structured").
   // If the bytecodes are strange (jumping out of a jsr block) then we
   // might end up trying to re-parse a block containing a jsr which
   // has already been activated. Watch for this case and bail out.
   for (ScopeData* cur_scope_data = scope_data();
        cur_scope_data != NULL && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope();
        cur_scope_data = cur_scope_data->parent()) {
     if (cur_scope_data->jsr_entry_bci() == dest) {
       BAILOUT("too-complicated jsr/ret structure");
     }
   }
   push(addressType, append(new Constant(new AddressConstant(next_bci()))));
   if (!try_inline_jsr(dest)) {
     return; // bailed out while parsing and inlining subroutine
   }
 }
 void GraphBuilder::ret(int local_index) {
   if (!parsing_jsr()) BAILOUT("ret encountered while not parsing subroutine");
   if (local_index != scope_data()->jsr_return_address_local()) {
     BAILOUT("can not handle complicated jsr/ret constructs");
   }
   // Rets simply become (NON-SAFEPOINT) gotos to the jsr continuation
   append(new Goto(scope_data()->jsr_continuation(), false));
 }
 void GraphBuilder::table_switch() {
   Bytecode_tableswitch sw(stream());
   const int l = sw.length();
   if (CanonicalizeNodes && l == 1) {
     // total of 2 successors => use If instead of switch
     // Note: This code should go into the canonicalizer as soon as it can
     //       can handle canonicalized forms that contain more than one node.
     Value key = append(new Constant(new IntConstant(sw.low_key())));
     BlockBegin* tsux = block_at(bci() + sw.dest_offset_at(0));
     BlockBegin* fsux = block_at(bci() + sw.default_offset());
     bool is_bb = tsux->bci() < bci() || fsux->bci() < bci();
     ValueStack* state_before = is_bb ? copy_state_before() : NULL;
     append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb));
   } else {
     // collect successors
     BlockList* sux = new BlockList(l + 1, NULL);
     int i;
     bool has_bb = false;
     for (i = 0; i < l; i++) {
       sux->at_put(i, block_at(bci() + sw.dest_offset_at(i)));
       if (sw.dest_offset_at(i) < 0) has_bb = true;
     }
     // add default successor
     sux->at_put(i, block_at(bci() + sw.default_offset()));
     ValueStack* state_before = has_bb ? copy_state_before() : NULL;
     append(new TableSwitch(ipop(), sux, sw.low_key(), state_before, has_bb));
   }
 }
 void GraphBuilder::lookup_switch() {
   Bytecode_lookupswitch sw(stream());
   const int l = sw.number_of_pairs();
   if (CanonicalizeNodes && l == 1) {
     // total of 2 successors => use If instead of switch
     // Note: This code should go into the canonicalizer as soon as it can
     //       can handle canonicalized forms that contain more than one node.
     // simplify to If
     LookupswitchPair pair = sw.pair_at(0);
     Value key = append(new Constant(new IntConstant(pair.match())));
     BlockBegin* tsux = block_at(bci() + pair.offset());
     BlockBegin* fsux = block_at(bci() + sw.default_offset());
     bool is_bb = tsux->bci() < bci() || fsux->bci() < bci();
     ValueStack* state_before = is_bb ? copy_state_before() : NULL;
     append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb));
   } else {
     // collect successors & keys
     BlockList* sux = new BlockList(l + 1, NULL);
     intArray* keys = new intArray(l, 0);
     int i;
     bool has_bb = false;
     for (i = 0; i < l; i++) {
       LookupswitchPair pair = sw.pair_at(i);
       if (pair.offset() < 0) has_bb = true;
       sux->at_put(i, block_at(bci() + pair.offset()));
       keys->at_put(i, pair.match());
     }
     // add default successor
     sux->at_put(i, block_at(bci() + sw.default_offset()));
     ValueStack* state_before = has_bb ? copy_state_before() : NULL;
     append(new LookupSwitch(ipop(), sux, keys, state_before, has_bb));
   }
 }
 void GraphBuilder::call_register_finalizer() {
   // If the receiver requires finalization then emit code to perform
   // the registration on return.
   // Gather some type information about the receiver
   Value receiver = state()->local_at(0);
   assert(receiver != NULL, "must have a receiver");
   ciType* declared_type = receiver->declared_type();
   ciType* exact_type = receiver->exact_type();
   if (exact_type == NULL &&
       receiver->as_Local() &&
       receiver->as_Local()->java_index() == 0) {
     ciInstanceKlass* ik = compilation()->method()->holder();
     if (ik->is_final()) {
       exact_type = ik;
     } else if (UseCHA && !(ik->has_subklass() || ik->is_interface())) {
       // test class is leaf class
       compilation()->dependency_recorder()->assert_leaf_type(ik);
       exact_type = ik;
     } else {
       declared_type = ik;
     }
   }
   // see if we know statically that registration isn't required
   bool needs_check = true;
   if (exact_type != NULL) {
     needs_check = exact_type->as_instance_klass()->has_finalizer();
   } else if (declared_type != NULL) {
     ciInstanceKlass* ik = declared_type->as_instance_klass();
     if (!Dependencies::has_finalizable_subclass(ik)) {
       compilation()->dependency_recorder()->assert_has_no_finalizable_subclasses(ik);
       needs_check = false;
     }
   }
   if (needs_check) {
     // Perform the registration of finalizable objects.
     ValueStack* state_before = copy_state_for_exception();
     load_local(objectType, 0);
     append_split(new Intrinsic(voidType, vmIntrinsics::_Object_init,
                                state()->pop_arguments(1),
                                true, state_before, true));
   }
 }
 void GraphBuilder::method_return(Value x) {
   if (RegisterFinalizersAtInit &&
       method()->intrinsic_id() == vmIntrinsics::_Object_init) {
     call_register_finalizer();
   }
   // Check to see whether we are inlining. If so, Return
   // instructions become Gotos to the continuation point.
   if (continuation() != NULL) {
     assert(!method()->is_synchronized() || InlineSynchronizedMethods, "can not inline synchronized methods yet");
     // If the inlined method is synchronized, the monitor must be
     // released before we jump to the continuation block.
     if (method()->is_synchronized()) {
       assert(state()->locks_size() == 1, "receiver must be locked here");
       monitorexit(state()->lock_at(0), SynchronizationEntryBCI);
     }
     // State at end of inlined method is the state of the caller
     // without the method parameters on stack, including the
     // return value, if any, of the inlined method on operand stack.
     set_state(state()->caller_state()->copy_for_parsing());
     if (x != NULL) {
       state()->push(x->type(), x);
     }
     Goto* goto_callee = new Goto(continuation(), false);
     // See whether this is the first return; if so, store off some
     // of the state for later examination
     if (num_returns() == 0) {
       set_inline_cleanup_info(_block, _last, state());
     }
     // The current bci() is in the wrong scope, so use the bci() of
     // the continuation point.
     append_with_bci(goto_callee, scope_data()->continuation()->bci());
     incr_num_returns();
     return;
   }
   state()->truncate_stack(0);
   if (method()->is_synchronized()) {
     // perform the unlocking before exiting the method
     Value receiver;
     if (!method()->is_static()) {
       receiver = _initial_state->local_at(0);
     } else {
       receiver = append(new Constant(new ClassConstant(method()->holder())));
     }
     append_split(new MonitorExit(receiver, state()->unlock()));
   }
   append(new Return(x));
 }
 void GraphBuilder::access_field(Bytecodes::Code code) {
   bool will_link;
   ciField* field = stream()->get_field(will_link);
   ciInstanceKlass* holder = field->holder();
   BasicType field_type = field->type()->basic_type();
   ValueType* type = as_ValueType(field_type);
   // call will_link again to determine if the field is valid.
   const bool is_loaded = holder->is_loaded() &&
                          field->will_link(method()->holder(), code);
   const bool is_initialized = is_loaded && holder->is_initialized();
   ValueStack* state_before = NULL;
   if (!is_initialized || PatchALot) {
     // save state before instruction for debug info when
     // deoptimization happens during patching
     state_before = copy_state_before();
   }
   Value obj = NULL;
   if (code == Bytecodes::_getstatic || code == Bytecodes::_putstatic) {
     // commoning of class constants should only occur if the class is
     // fully initialized and resolved in this constant pool.  The will_link test
     // above essentially checks if this class is resolved in this constant pool
     // so, the is_initialized flag should be suffiect.
     if (state_before != NULL) {
       // build a patching constant
       obj = new Constant(new ClassConstant(holder), state_before);
     } else {
       obj = new Constant(new ClassConstant(holder));
     }
   }
   const int offset = is_loaded ? field->offset() : -1;
   switch (code) {
     case Bytecodes::_getstatic: {
       // check for compile-time constants, i.e., initialized static final fields
       Instruction* constant = NULL;
       if (field->is_constant() && !PatchALot) {
         ciConstant field_val = field->constant_value();
         BasicType field_type = field_val.basic_type();
         switch (field_type) {
         case T_ARRAY:
         case T_OBJECT:
           if (field_val.as_object()->should_be_constant()) {
             constant =  new Constant(as_ValueType(field_val));
           }
           break;
         default:
           constant = new Constant(as_ValueType(field_val));
         }
       }
       if (constant != NULL) {
         push(type, append(constant));
       } else {
         if (state_before == NULL) {
           state_before = copy_state_for_exception();
         }
         push(type, append(new LoadField(append(obj), offset, field, true,
                                         state_before, is_loaded, is_initialized)));
       }
       break;
     }
     case Bytecodes::_putstatic:
       { Value val = pop(type);
         if (state_before == NULL) {
           state_before = copy_state_for_exception();
         }
         append(new StoreField(append(obj), offset, field, val, true, state_before, is_loaded, is_initialized));
       }
       break;
     case Bytecodes::_getfield :
       {
         if (state_before == NULL) {
           state_before = copy_state_for_exception();
         }
         LoadField* load = new LoadField(apop(), offset, field, false, state_before, is_loaded, true);
         Value replacement = is_loaded ? _memory->load(load) : load;
         if (replacement != load) {
           assert(replacement->is_linked() || !replacement->can_be_linked(), "should already by linked");
           push(type, replacement);
         } else {
           push(type, append(load));
         }
         break;
       }
     case Bytecodes::_putfield :
       { Value val = pop(type);
         if (state_before == NULL) {
           state_before = copy_state_for_exception();
         }
         StoreField* store = new StoreField(apop(), offset, field, val, false, state_before, is_loaded, true);
         if (is_loaded) store = _memory->store(store);
         if (store != NULL) {
           append(store);
         }
       }
       break;
     default                   :
       ShouldNotReachHere();
       break;
   }
 }
 Dependencies* GraphBuilder::dependency_recorder() const {
   assert(DeoptC1, "need debug information");
   return compilation()->dependency_recorder();
 }
 void GraphBuilder::invoke(Bytecodes::Code code) {
   bool will_link;
   ciMethod* target = stream()->get_method(will_link);
   // we have to make sure the argument size (incl. the receiver)
   // is correct for compilation (the call would fail later during
   // linkage anyway) - was bug (gri 7/28/99)
   if (target->is_loaded() && target->is_static() != (code == Bytecodes::_invokestatic)) BAILOUT("will cause link error");
   ciInstanceKlass* klass = target->holder();
   // check if CHA possible: if so, change the code to invoke_special
   ciInstanceKlass* calling_klass = method()->holder();
   ciKlass* holder = stream()->get_declared_method_holder();
   ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder);
   ciInstanceKlass* actual_recv = callee_holder;
   // some methods are obviously bindable without any type checks so
   // convert them directly to an invokespecial.
   if (target->is_loaded() && !target->is_abstract() &&
       target->can_be_statically_bound() && code == Bytecodes::_invokevirtual) {
     code = Bytecodes::_invokespecial;
   }
   // NEEDS_CLEANUP
   // I've added the target-is_loaded() test below but I don't really understand
   // how klass->is_loaded() can be true and yet target->is_loaded() is false.
   // this happened while running the JCK invokevirtual tests under doit.  TKR
   ciMethod* cha_monomorphic_target = NULL;
   ciMethod* exact_target = NULL;
   if (UseCHA && DeoptC1 && klass->is_loaded() && target->is_loaded() &&
       !target->is_method_handle_invoke()) {
     Value receiver = NULL;
     ciInstanceKlass* receiver_klass = NULL;
     bool type_is_exact = false;
     // try to find a precise receiver type
     if (will_link && !target->is_static()) {
       int index = state()->stack_size() - (target->arg_size_no_receiver() + 1);
       receiver = state()->stack_at(index);
       ciType* type = receiver->exact_type();
       if (type != NULL && type->is_loaded() &&
           type->is_instance_klass() && !type->as_instance_klass()->is_interface()) {
         receiver_klass = (ciInstanceKlass*) type;
         type_is_exact = true;
       }
       if (type == NULL) {
         type = receiver->declared_type();
         if (type != NULL && type->is_loaded() &&
             type->is_instance_klass() && !type->as_instance_klass()->is_interface()) {
           receiver_klass = (ciInstanceKlass*) type;
           if (receiver_klass->is_leaf_type() && !receiver_klass->is_final()) {
             // Insert a dependency on this type since
             // find_monomorphic_target may assume it's already done.
             dependency_recorder()->assert_leaf_type(receiver_klass);
             type_is_exact = true;
           }
         }
       }
     }
     if (receiver_klass != NULL && type_is_exact &&
         receiver_klass->is_loaded() && code != Bytecodes::_invokespecial) {
       // If we have the exact receiver type we can bind directly to
       // the method to call.
       exact_target = target->resolve_invoke(calling_klass, receiver_klass);
       if (exact_target != NULL) {
         target = exact_target;
         code = Bytecodes::_invokespecial;
       }
     }
     if (receiver_klass != NULL &&
         receiver_klass->is_subtype_of(actual_recv) &&
         actual_recv->is_initialized()) {
       actual_recv = receiver_klass;
     }
     if ((code == Bytecodes::_invokevirtual && callee_holder->is_initialized()) ||
         (code == Bytecodes::_invokeinterface && callee_holder->is_initialized() && !actual_recv->is_interface())) {
       // Use CHA on the receiver to select a more precise method.
       cha_monomorphic_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv);
     } else if (code == Bytecodes::_invokeinterface && callee_holder->is_loaded() && receiver != NULL) {
       // if there is only one implementor of this interface then we
       // may be able bind this invoke directly to the implementing
       // klass but we need both a dependence on the single interface
       // and on the method we bind to.  Additionally since all we know
       // about the receiver type is the it's supposed to implement the
       // interface we have to insert a check that it's the class we
       // expect.  Interface types are not checked by the verifier so
       // they are roughly equivalent to Object.
       ciInstanceKlass* singleton = NULL;
       if (target->holder()->nof_implementors() == 1) {
         singleton = target->holder()->implementor(0);
       }
       if (singleton) {
         cha_monomorphic_target = target->find_monomorphic_target(calling_klass, target->holder(), singleton);
         if (cha_monomorphic_target != NULL) {
           // If CHA is able to bind this invoke then update the class
           // to match that class, otherwise klass will refer to the
           // interface.
           klass = cha_monomorphic_target->holder();
           actual_recv = target->holder();
           // insert a check it's really the expected class.
           CheckCast* c = new CheckCast(klass, receiver, copy_state_for_exception());
           c->set_incompatible_class_change_check();
           c->set_direct_compare(klass->is_final());
           append_split(c);
         }
       }
     }
   }
   if (cha_monomorphic_target != NULL) {
     if (cha_monomorphic_target->is_abstract()) {
       // Do not optimize for abstract methods
       cha_monomorphic_target = NULL;
     }
   }
   if (cha_monomorphic_target != NULL) {
     if (!(target->is_final_method())) {
       // If we inlined because CHA revealed only a single target method,
       // then we are dependent on that target method not getting overridden
       // by dynamic class loading.  Be sure to test the "static" receiver
       // dest_method here, as opposed to the actual receiver, which may
       // falsely lead us to believe that the receiver is final or private.
       dependency_recorder()->assert_unique_concrete_method(actual_recv, cha_monomorphic_target);
     }
     code = Bytecodes::_invokespecial;
   }
   // check if we could do inlining
   if (!PatchALot && Inline && klass->is_loaded() &&
       (klass->is_initialized() || klass->is_interface() && target->holder()->is_initialized())
       && target->will_link(klass, callee_holder, code)) {
     // callee is known => check if we have static binding
     assert(target->is_loaded(), "callee must be known");
     if (code == Bytecodes::_invokestatic
      || code == Bytecodes::_invokespecial
      || code == Bytecodes::_invokevirtual && target->is_final_method()
     ) {
       // static binding => check if callee is ok
       ciMethod* inline_target = (cha_monomorphic_target != NULL)
                                   ? cha_monomorphic_target
                                   : target;
       bool res = try_inline(inline_target, (cha_monomorphic_target != NULL) || (exact_target != NULL));
       CHECK_BAILOUT();
 #ifndef PRODUCT
       // printing
       if (PrintInlining && !res) {
         // if it was successfully inlined, then it was already printed.
         print_inline_result(inline_target, res);
       }
 #endif
       clear_inline_bailout();
       if (res) {
         // Register dependence if JVMTI has either breakpoint
         // setting or hotswapping of methods capabilities since they may
         // cause deoptimization.
         if (compilation()->env()->jvmti_can_hotswap_or_post_breakpoint()) {
           dependency_recorder()->assert_evol_method(inline_target);
         }
         return;
       }
     }
   }
   // If we attempted an inline which did not succeed because of a
   // bailout during construction of the callee graph, the entire
   // compilation has to be aborted. This is fairly rare and currently
   // seems to only occur for jasm-generated classes which contain
   // jsr/ret pairs which are not associated with finally clauses and
   // do not have exception handlers in the containing method, and are
   // therefore not caught early enough to abort the inlining without
   // corrupting the graph. (We currently bail out with a non-empty
   // stack at a ret in these situations.)
   CHECK_BAILOUT();
   // inlining not successful => standard invoke
   bool is_loaded = target->is_loaded();
   bool has_receiver =
     code == Bytecodes::_invokespecial   ||
     code == Bytecodes::_invokevirtual   ||
     code == Bytecodes::_invokeinterface;
   bool is_invokedynamic = code == Bytecodes::_invokedynamic;
   ValueType* result_type = as_ValueType(target->return_type());
   // We require the debug info to be the "state before" because
   // invokedynamics may deoptimize.
   ValueStack* state_before = is_invokedynamic ? copy_state_before() : copy_state_exhandling();
   Values* args = state()->pop_arguments(target->arg_size_no_receiver());
   Value recv = has_receiver ? apop() : NULL;
   int vtable_index = methodOopDesc::invalid_vtable_index;
 #ifdef SPARC
   // Currently only supported on Sparc.
   // The UseInlineCaches only controls dispatch to invokevirtuals for
   // loaded classes which we weren't able to statically bind.
   if (!UseInlineCaches && is_loaded && code == Bytecodes::_invokevirtual
       && !target->can_be_statically_bound()) {
     // Find a vtable index if one is available
     vtable_index = target->resolve_vtable_index(calling_klass, callee_holder);
   }
 #endif
   if (recv != NULL &&
       (code == Bytecodes::_invokespecial ||
        !is_loaded || target->is_final())) {
     // invokespecial always needs a NULL check.  invokevirtual where
     // the target is final or where it's not known that whether the
     // target is final requires a NULL check.  Otherwise normal
     // invokevirtual will perform the null check during the lookup
     // logic or the unverified entry point.  Profiling of calls
     // requires that the null check is performed in all cases.
     null_check(recv);
   }
   if (is_profiling()) {
     if (recv != NULL && profile_calls()) {
       null_check(recv);
     }
     // Note that we'd collect profile data in this method if we wanted it.
     compilation()->set_would_profile(true);
     if (profile_calls()) {
       assert(cha_monomorphic_target == NULL || exact_target == NULL, "both can not be set");
       ciKlass* target_klass = NULL;
       if (cha_monomorphic_target != NULL) {
         target_klass = cha_monomorphic_target->holder();
       } else if (exact_target != NULL) {
         target_klass = exact_target->holder();
       }
       profile_call(recv, target_klass);
     }
   }
   Invoke* result = new Invoke(code, result_type, recv, args, vtable_index, target, state_before);
   // push result
   append_split(result);
   if (result_type != voidType) {
     if (method()->is_strict()) {
       push(result_type, round_fp(result));
     } else {
       push(result_type, result);
     }
   }
 }
 void GraphBuilder::new_instance(int klass_index) {
   ValueStack* state_before = copy_state_exhandling();
   bool will_link;
   ciKlass* klass = stream()->get_klass(will_link);
   assert(klass->is_instance_klass(), "must be an instance klass");
   NewInstance* new_instance = new NewInstance(klass->as_instance_klass(), state_before);
   _memory->new_instance(new_instance);
   apush(append_split(new_instance));
 }
 void GraphBuilder::new_type_array() {
   ValueStack* state_before = copy_state_exhandling();
   apush(append_split(new NewTypeArray(ipop(), (BasicType)stream()->get_index(), state_before)));
 }
 void GraphBuilder::new_object_array() {
   bool will_link;
   ciKlass* klass = stream()->get_klass(will_link);
   ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
   NewArray* n = new NewObjectArray(klass, ipop(), state_before);
   apush(append_split(n));
 }
 bool GraphBuilder::direct_compare(ciKlass* k) {
   if (k->is_loaded() && k->is_instance_klass() && !UseSlowPath) {
     ciInstanceKlass* ik = k->as_instance_klass();
     if (ik->is_final()) {
       return true;
     } else {
       if (DeoptC1 && UseCHA && !(ik->has_subklass() || ik->is_interface())) {
         // test class is leaf class
         dependency_recorder()->assert_leaf_type(ik);
         return true;
       }
     }
   }
   return false;
 }
 void GraphBuilder::check_cast(int klass_index) {
   bool will_link;
   ciKlass* klass = stream()->get_klass(will_link);
   ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_for_exception();
   CheckCast* c = new CheckCast(klass, apop(), state_before);
   apush(append_split(c));
   c->set_direct_compare(direct_compare(klass));
   if (is_profiling()) {
     // Note that we'd collect profile data in this method if we wanted it.
     compilation()->set_would_profile(true);
     if (profile_checkcasts()) {
       c->set_profiled_method(method());
       c->set_profiled_bci(bci());
       c->set_should_profile(true);
     }
   }
 }
 void GraphBuilder::instance_of(int klass_index) {
   bool will_link;
   ciKlass* klass = stream()->get_klass(will_link);
   ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
   InstanceOf* i = new InstanceOf(klass, apop(), state_before);
   ipush(append_split(i));
   i->set_direct_compare(direct_compare(klass));
   if (is_profiling()) {
     // Note that we'd collect profile data in this method if we wanted it.
     compilation()->set_would_profile(true);
     if (profile_checkcasts()) {
       i->set_profiled_method(method());
       i->set_profiled_bci(bci());
       i->set_should_profile(true);
     }
   }
 }
 void GraphBuilder::monitorenter(Value x, int bci) {
   // save state before locking in case of deoptimization after a NullPointerException
   ValueStack* state_before = copy_state_for_exception_with_bci(bci);
   append_with_bci(new MonitorEnter(x, state()->lock(x), state_before), bci);
   kill_all();
 }
 void GraphBuilder::monitorexit(Value x, int bci) {
   append_with_bci(new MonitorExit(x, state()->unlock()), bci);
   kill_all();
 }
 void GraphBuilder::new_multi_array(int dimensions) {
   bool will_link;
   ciKlass* klass = stream()->get_klass(will_link);
   ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
   Values* dims = new Values(dimensions, NULL);
   // fill in all dimensions
   int i = dimensions;
   while (i-- > 0) dims->at_put(i, ipop());
   // create array
   NewArray* n = new NewMultiArray(klass, dims, state_before);
   apush(append_split(n));
 }
 void GraphBuilder::throw_op(int bci) {
   // We require that the debug info for a Throw be the "state before"
   // the Throw (i.e., exception oop is still on TOS)
   ValueStack* state_before = copy_state_before_with_bci(bci);
   Throw* t = new Throw(apop(), state_before);
   // operand stack not needed after a throw
   state()->truncate_stack(0);
   append_with_bci(t, bci);
 }
 Value GraphBuilder::round_fp(Value fp_value) {
   // no rounding needed if SSE2 is used
   if (RoundFPResults && UseSSE < 2) {
     // Must currently insert rounding node for doubleword values that
     // are results of expressions (i.e., not loads from memory or
     // constants)
     if (fp_value->type()->tag() == doubleTag &&
         fp_value->as_Constant() == NULL &&
         fp_value->as_Local() == NULL &&       // method parameters need no rounding
         fp_value->as_RoundFP() == NULL) {
       return append(new RoundFP(fp_value));
     }
   }
   return fp_value;
 }
 Instruction* GraphBuilder::append_with_bci(Instruction* instr, int bci) {
   Canonicalizer canon(compilation(), instr, bci);
   Instruction* i1 = canon.canonical();
   if (i1->is_linked() || !i1->can_be_linked()) {
     // Canonicalizer returned an instruction which was already
     // appended so simply return it.
     return i1;
   }
   if (UseLocalValueNumbering) {
     // Lookup the instruction in the ValueMap and add it to the map if
     // it's not found.
     Instruction* i2 = vmap()->find_insert(i1);
     if (i2 != i1) {
       // found an entry in the value map, so just return it.
       assert(i2->is_linked(), "should already be linked");
       return i2;
     }
     ValueNumberingEffects vne(vmap());
     i1->visit(&vne);
   }
   // i1 was not eliminated => append it
   assert(i1->next() == NULL, "shouldn't already be linked");
   _last = _last->set_next(i1, canon.bci());
   if (++_instruction_count >= InstructionCountCutoff && !bailed_out()) {
     // set the bailout state but complete normal processing.  We
     // might do a little more work before noticing the bailout so we
     // want processing to continue normally until it's noticed.
     bailout("Method and/or inlining is too large");
   }
 #ifndef PRODUCT
   if (PrintIRDuringConstruction) {
     InstructionPrinter ip;
     ip.print_line(i1);
     if (Verbose) {
       state()->print();
     }
   }
 #endif
   // save state after modification of operand stack for StateSplit instructions
   StateSplit* s = i1->as_StateSplit();
   if (s != NULL) {
     if (EliminateFieldAccess) {
       Intrinsic* intrinsic = s->as_Intrinsic();
       if (s->as_Invoke() != NULL || (intrinsic && !intrinsic->preserves_state())) {
         _memory->kill();
       }
     }
     s->set_state(state()->copy(ValueStack::StateAfter, canon.bci()));
   }
   // set up exception handlers for this instruction if necessary
   if (i1->can_trap()) {
     i1->set_exception_handlers(handle_exception(i1));
     assert(i1->exception_state() != NULL || !i1->needs_exception_state() || bailed_out(), "handle_exception must set exception state");
   }
   return i1;
 }
 Instruction* GraphBuilder::append(Instruction* instr) {
   assert(instr->as_StateSplit() == NULL || instr->as_BlockEnd() != NULL, "wrong append used");
   return append_with_bci(instr, bci());
 }
 Instruction* GraphBuilder::append_split(StateSplit* instr) {
   return append_with_bci(instr, bci());
 }
 void GraphBuilder::null_check(Value value) {
   if (value->as_NewArray() != NULL || value->as_NewInstance() != NULL) {
     return;
   } else {
     Constant* con = value->as_Constant();
     if (con) {
       ObjectType* c = con->type()->as_ObjectType();
       if (c && c->is_loaded()) {
         ObjectConstant* oc = c->as_ObjectConstant();
         if (!oc || !oc->value()->is_null_object()) {
           return;
         }
       }
     }
   }
   append(new NullCheck(value, copy_state_for_exception()));
 }
 XHandlers* GraphBuilder::handle_exception(Instruction* instruction) {
   if (!has_handler() && (!instruction->needs_exception_state() || instruction->exception_state() != NULL)) {
     assert(instruction->exception_state() == NULL
            || instruction->exception_state()->kind() == ValueStack::EmptyExceptionState
            || (instruction->exception_state()->kind() == ValueStack::ExceptionState && _compilation->env()->jvmti_can_access_local_variables()),
            "exception_state should be of exception kind");
     return new XHandlers();
   }
   XHandlers*  exception_handlers = new XHandlers();
   ScopeData*  cur_scope_data = scope_data();
   ValueStack* cur_state = instruction->state_before();
   ValueStack* prev_state = NULL;
   int scope_count = 0;
   assert(cur_state != NULL, "state_before must be set");
   do {
     int cur_bci = cur_state->bci();
     assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match");
     assert(cur_bci == SynchronizationEntryBCI || cur_bci == cur_scope_data->stream()->cur_bci(), "invalid bci");
     // join with all potential exception handlers
     XHandlers* list = cur_scope_data->xhandlers();
     const int n = list->length();
     for (int i = 0; i < n; i++) {
       XHandler* h = list->handler_at(i);
       if (h->covers(cur_bci)) {
         // h is a potential exception handler => join it
         compilation()->set_has_exception_handlers(true);
         BlockBegin* entry = h->entry_block();
         if (entry == block()) {
           // It's acceptable for an exception handler to cover itself
           // but we don't handle that in the parser currently.  It's
           // very rare so we bailout instead of trying to handle it.
           BAILOUT_("exception handler covers itself", exception_handlers);
         }
         assert(entry->bci() == h->handler_bci(), "must match");
         assert(entry->bci() == -1 || entry == cur_scope_data->block_at(entry->bci()), "blocks must correspond");
         // previously this was a BAILOUT, but this is not necessary
         // now because asynchronous exceptions are not handled this way.
         assert(entry->state() == NULL || cur_state->total_locks_size() == entry->state()->total_locks_size(), "locks do not match");
         // xhandler start with an empty expression stack
         if (cur_state->stack_size() != 0) {
           cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci());
         }
         if (instruction->exception_state() == NULL) {
           instruction->set_exception_state(cur_state);
         }
         // Note: Usually this join must work. However, very
         // complicated jsr-ret structures where we don't ret from
         // the subroutine can cause the objects on the monitor
         // stacks to not match because blocks can be parsed twice.
         // The only test case we've seen so far which exhibits this
         // problem is caught by the infinite recursion test in
         // GraphBuilder::jsr() if the join doesn't work.
         if (!entry->try_merge(cur_state)) {
           BAILOUT_("error while joining with exception handler, prob. due to complicated jsr/rets", exception_handlers);
         }
         // add current state for correct handling of phi functions at begin of xhandler
         int phi_operand = entry->add_exception_state(cur_state);
         // add entry to the list of xhandlers of this block
         _block->add_exception_handler(entry);
         // add back-edge from xhandler entry to this block
         if (!entry->is_predecessor(_block)) {
           entry->add_predecessor(_block);
         }
         // clone XHandler because phi_operand and scope_count can not be shared
         XHandler* new_xhandler = new XHandler(h);
         new_xhandler->set_phi_operand(phi_operand);
         new_xhandler->set_scope_count(scope_count);
         exception_handlers->append(new_xhandler);
         // fill in exception handler subgraph lazily
         assert(!entry->is_set(BlockBegin::was_visited_flag), "entry must not be visited yet");
         cur_scope_data->add_to_work_list(entry);
         // stop when reaching catchall
         if (h->catch_type() == 0) {
           return exception_handlers;
         }
       }
     }
     if (exception_handlers->length() == 0) {
       // This scope and all callees do not handle exceptions, so the local
       // variables of this scope are not needed. However, the scope itself is
       // required for a correct exception stack trace -> clear out the locals.
       if (_compilation->env()->jvmti_can_access_local_variables()) {
         cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci());
       } else {
         cur_state = cur_state->copy(ValueStack::EmptyExceptionState, cur_state->bci());
       }
       if (prev_state != NULL) {
         prev_state->set_caller_state(cur_state);
       }
       if (instruction->exception_state() == NULL) {
         instruction->set_exception_state(cur_state);
       }
     }
     // Set up iteration for next time.
     // If parsing a jsr, do not grab exception handlers from the
     // parent scopes for this method (already got them, and they
     // needed to be cloned)
     while (cur_scope_data->parsing_jsr()) {
       cur_scope_data = cur_scope_data->parent();
     }
     assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match");
     assert(cur_state->locks_size() == 0 || cur_state->locks_size() == 1, "unlocking must be done in a catchall exception handler");
     prev_state = cur_state;
     cur_state = cur_state->caller_state();
     cur_scope_data = cur_scope_data->parent();
     scope_count++;
   } while (cur_scope_data != NULL);
   return exception_handlers;
 }
 // Helper class for simplifying Phis.
 class PhiSimplifier : public BlockClosure {
  private:
   bool _has_substitutions;
   Value simplify(Value v);
  public:
   PhiSimplifier(BlockBegin* start) : _has_substitutions(false) {
     start->iterate_preorder(this);
     if (_has_substitutions) {
       SubstitutionResolver sr(start);
     }
   }
   void block_do(BlockBegin* b);
   bool has_substitutions() const { return _has_substitutions; }
 };
 Value PhiSimplifier::simplify(Value v) {
   Phi* phi = v->as_Phi();
   if (phi == NULL) {
     // no phi function
     return v;
   } else if (v->has_subst()) {
     // already substituted; subst can be phi itself -> simplify
     return simplify(v->subst());
   } else if (phi->is_set(Phi::cannot_simplify)) {
     // already tried to simplify phi before
     return phi;
   } else if (phi->is_set(Phi::visited)) {
     // break cycles in phi functions
     return phi;
   } else if (phi->type()->is_illegal()) {
     // illegal phi functions are ignored anyway
     return phi;
   } else {
     // mark phi function as processed to break cycles in phi functions
     phi->set(Phi::visited);
     // simplify x = [y, x] and x = [y, y] to y
     Value subst = NULL;
     int opd_count = phi->operand_count();
     for (int i = 0; i < opd_count; i++) {
       Value opd = phi->operand_at(i);
       assert(opd != NULL, "Operand must exist!");
       if (opd->type()->is_illegal()) {
         // if one operand is illegal, the entire phi function is illegal
         phi->make_illegal();
         phi->clear(Phi::visited);
         return phi;
       }
       Value new_opd = simplify(opd);
       assert(new_opd != NULL, "Simplified operand must exist!");
       if (new_opd != phi && new_opd != subst) {
         if (subst == NULL) {
           subst = new_opd;
         } else {
           // no simplification possible
           phi->set(Phi::cannot_simplify);
           phi->clear(Phi::visited);
           return phi;
         }
       }
     }
     // sucessfully simplified phi function
     assert(subst != NULL, "illegal phi function");
     _has_substitutions = true;
     phi->clear(Phi::visited);
     phi->set_subst(subst);
 #ifndef PRODUCT
     if (PrintPhiFunctions) {
       tty->print_cr("simplified phi function %c%d to %c%d (Block B%d)", phi->type()->tchar(), phi->id(), subst->type()->tchar(), subst->id(), phi->block()->block_id());
     }
 #endif
     return subst;
   }
 }
 void PhiSimplifier::block_do(BlockBegin* b) {
   for_each_phi_fun(b, phi,
     simplify(phi);
   );
 #ifdef ASSERT
   for_each_phi_fun(b, phi,
                    assert(phi->operand_count() != 1 || phi->subst() != phi, "missed trivial simplification");
   );
   ValueStack* state = b->state()->caller_state();
   for_each_state_value(state, value,
     Phi* phi = value->as_Phi();
     assert(phi == NULL || phi->block() != b, "must not have phi function to simplify in caller state");
   );
 #endif
 }
 // This method is called after all blocks are filled with HIR instructions
 // It eliminates all Phi functions of the form x = [y, y] and x = [y, x]
 void GraphBuilder::eliminate_redundant_phis(BlockBegin* start) {
   PhiSimplifier simplifier(start);
 }
 void GraphBuilder::connect_to_end(BlockBegin* beg) {
   // setup iteration
   kill_all();
   _block = beg;
   _state = beg->state()->copy_for_parsing();
   _last  = beg;
   iterate_bytecodes_for_block(beg->bci());
 }
 BlockEnd* GraphBuilder::iterate_bytecodes_for_block(int bci) {
 #ifndef PRODUCT
   if (PrintIRDuringConstruction) {
     tty->cr();
     InstructionPrinter ip;
     ip.print_instr(_block); tty->cr();
     ip.print_stack(_block->state()); tty->cr();
     ip.print_inline_level(_block);
     ip.print_head();
     tty->print_cr("locals size: %d stack size: %d", state()->locals_size(), state()->stack_size());
   }
 #endif
   _skip_block = false;
   assert(state() != NULL, "ValueStack missing!");
   ciBytecodeStream s(method());
   s.reset_to_bci(bci);
   int prev_bci = bci;
   scope_data()->set_stream(&s);
   // iterate
   Bytecodes::Code code = Bytecodes::_illegal;
   bool push_exception = false;
   if (block()->is_set(BlockBegin::exception_entry_flag) && block()->next() == NULL) {
     // first thing in the exception entry block should be the exception object.
     push_exception = true;
   }
   while (!bailed_out() && last()->as_BlockEnd() == NULL &&
          (code = stream()->next()) != ciBytecodeStream::EOBC() &&
          (block_at(s.cur_bci()) == NULL || block_at(s.cur_bci()) == block())) {
     assert(state()->kind() == ValueStack::Parsing, "invalid state kind");
     // Check for active jsr during OSR compilation
     if (compilation()->is_osr_compile()
         && scope()->is_top_scope()
         && parsing_jsr()
         && s.cur_bci() == compilation()->osr_bci()) {
       bailout("OSR not supported while a jsr is active");
     }
     if (push_exception) {
       apush(append(new ExceptionObject()));
       push_exception = false;
     }
     // handle bytecode
     switch (code) {
       case Bytecodes::_nop            : /* nothing to do */ break;
       case Bytecodes::_aconst_null    : apush(append(new Constant(objectNull            ))); break;
       case Bytecodes::_iconst_m1      : ipush(append(new Constant(new IntConstant   (-1)))); break;
       case Bytecodes::_iconst_0       : ipush(append(new Constant(intZero               ))); break;
       case Bytecodes::_iconst_1       : ipush(append(new Constant(intOne                ))); break;
       case Bytecodes::_iconst_2       : ipush(append(new Constant(new IntConstant   ( 2)))); break;
       case Bytecodes::_iconst_3       : ipush(append(new Constant(new IntConstant   ( 3)))); break;
       case Bytecodes::_iconst_4       : ipush(append(new Constant(new IntConstant   ( 4)))); break;
       case Bytecodes::_iconst_5       : ipush(append(new Constant(new IntConstant   ( 5)))); break;
       case Bytecodes::_lconst_0       : lpush(append(new Constant(new LongConstant  ( 0)))); break;
       case Bytecodes::_lconst_1       : lpush(append(new Constant(new LongConstant  ( 1)))); break;
       case Bytecodes::_fconst_0       : fpush(append(new Constant(new FloatConstant ( 0)))); break;
       case Bytecodes::_fconst_1       : fpush(append(new Constant(new FloatConstant ( 1)))); break;
       case Bytecodes::_fconst_2       : fpush(append(new Constant(new FloatConstant ( 2)))); break;
       case Bytecodes::_dconst_0       : dpush(append(new Constant(new DoubleConstant( 0)))); break;
       case Bytecodes::_dconst_1       : dpush(append(new Constant(new DoubleConstant( 1)))); break;
       case Bytecodes::_bipush         : ipush(append(new Constant(new IntConstant(((signed char*)s.cur_bcp())[1])))); break;
       case Bytecodes::_sipush         : ipush(append(new Constant(new IntConstant((short)Bytes::get_Java_u2(s.cur_bcp()+1))))); break;
       case Bytecodes::_ldc            : // fall through
       case Bytecodes::_ldc_w          : // fall through
       case Bytecodes::_ldc2_w         : load_constant(); break;
       case Bytecodes::_iload          : load_local(intType     , s.get_index()); break;
       case Bytecodes::_lload          : load_local(longType    , s.get_index()); break;
       case Bytecodes::_fload          : load_local(floatType   , s.get_index()); break;
       case Bytecodes::_dload          : load_local(doubleType  , s.get_index()); break;
       case Bytecodes::_aload          : load_local(instanceType, s.get_index()); break;
       case Bytecodes::_iload_0        : load_local(intType   , 0); break;
       case Bytecodes::_iload_1        : load_local(intType   , 1); break;
       case Bytecodes::_iload_2        : load_local(intType   , 2); break;
       case Bytecodes::_iload_3        : load_local(intType   , 3); break;
       case Bytecodes::_lload_0        : load_local(longType  , 0); break;
       case Bytecodes::_lload_1        : load_local(longType  , 1); break;
       case Bytecodes::_lload_2        : load_local(longType  , 2); break;
       case Bytecodes::_lload_3        : load_local(longType  , 3); break;
       case Bytecodes::_fload_0        : load_local(floatType , 0); break;
       case Bytecodes::_fload_1        : load_local(floatType , 1); break;
       case Bytecodes::_fload_2        : load_local(floatType , 2); break;
       case Bytecodes::_fload_3        : load_local(floatType , 3); break;
       case Bytecodes::_dload_0        : load_local(doubleType, 0); break;
       case Bytecodes::_dload_1        : load_local(doubleType, 1); break;
       case Bytecodes::_dload_2        : load_local(doubleType, 2); break;
       case Bytecodes::_dload_3        : load_local(doubleType, 3); break;
       case Bytecodes::_aload_0        : load_local(objectType, 0); break;
       case Bytecodes::_aload_1        : load_local(objectType, 1); break;
       case Bytecodes::_aload_2        : load_local(objectType, 2); break;
       case Bytecodes::_aload_3        : load_local(objectType, 3); break;
       case Bytecodes::_iaload         : load_indexed(T_INT   ); break;
       case Bytecodes::_laload         : load_indexed(T_LONG  ); break;
       case Bytecodes::_faload         : load_indexed(T_FLOAT ); break;
       case Bytecodes::_daload         : load_indexed(T_DOUBLE); break;
       case Bytecodes::_aaload         : load_indexed(T_OBJECT); break;
       case Bytecodes::_baload         : load_indexed(T_BYTE  ); break;
       case Bytecodes::_caload         : load_indexed(T_CHAR  ); break;
       case Bytecodes::_saload         : load_indexed(T_SHORT ); break;
       case Bytecodes::_istore         : store_local(intType   , s.get_index()); break;
       case Bytecodes::_lstore         : store_local(longType  , s.get_index()); break;
       case Bytecodes::_fstore         : store_local(floatType , s.get_index()); break;
       case Bytecodes::_dstore         : store_local(doubleType, s.get_index()); break;
       case Bytecodes::_astore         : store_local(objectType, s.get_index()); break;
       case Bytecodes::_istore_0       : store_local(intType   , 0); break;
       case Bytecodes::_istore_1       : store_local(intType   , 1); break;
       case Bytecodes::_istore_2       : store_local(intType   , 2); break;
       case Bytecodes::_istore_3       : store_local(intType   , 3); break;
       case Bytecodes::_lstore_0       : store_local(longType  , 0); break;
       case Bytecodes::_lstore_1       : store_local(longType  , 1); break;
       case Bytecodes::_lstore_2       : store_local(longType  , 2); break;
       case Bytecodes::_lstore_3       : store_local(longType  , 3); break;
       case Bytecodes::_fstore_0       : store_local(floatType , 0); break;
       case Bytecodes::_fstore_1       : store_local(floatType , 1); break;
       case Bytecodes::_fstore_2       : store_local(floatType , 2); break;
       case Bytecodes::_fstore_3       : store_local(floatType , 3); break;
       case Bytecodes::_dstore_0       : store_local(doubleType, 0); break;
       case Bytecodes::_dstore_1       : store_local(doubleType, 1); break;
       case Bytecodes::_dstore_2       : store_local(doubleType, 2); break;
       case Bytecodes::_dstore_3       : store_local(doubleType, 3); break;
       case Bytecodes::_astore_0       : store_local(objectType, 0); break;
       case Bytecodes::_astore_1       : store_local(objectType, 1); break;
       case Bytecodes::_astore_2       : store_local(objectType, 2); break;
       case Bytecodes::_astore_3       : store_local(objectType, 3); break;
       case Bytecodes::_iastore        : store_indexed(T_INT   ); break;
       case Bytecodes::_lastore        : store_indexed(T_LONG  ); break;
       case Bytecodes::_fastore        : store_indexed(T_FLOAT ); break;
       case Bytecodes::_dastore        : store_indexed(T_DOUBLE); break;
       case Bytecodes::_aastore        : store_indexed(T_OBJECT); break;
       case Bytecodes::_bastore        : store_indexed(T_BYTE  ); break;
       case Bytecodes::_castore        : store_indexed(T_CHAR  ); break;
       case Bytecodes::_sastore        : store_indexed(T_SHORT ); break;
       case Bytecodes::_pop            : // fall through
       case Bytecodes::_pop2           : // fall through
       case Bytecodes::_dup            : // fall through
       case Bytecodes::_dup_x1         : // fall through
       case Bytecodes::_dup_x2         : // fall through
       case Bytecodes::_dup2           : // fall through
       case Bytecodes::_dup2_x1        : // fall through
       case Bytecodes::_dup2_x2        : // fall through
       case Bytecodes::_swap           : stack_op(code); break;
       case Bytecodes::_iadd           : arithmetic_op(intType   , code); break;
       case Bytecodes::_ladd           : arithmetic_op(longType  , code); break;
       case Bytecodes::_fadd           : arithmetic_op(floatType , code); break;
       case Bytecodes::_dadd           : arithmetic_op(doubleType, code); break;
       case Bytecodes::_isub           : arithmetic_op(intType   , code); break;
       case Bytecodes::_lsub           : arithmetic_op(longType  , code); break;
       case Bytecodes::_fsub           : arithmetic_op(floatType , code); break;
       case Bytecodes::_dsub           : arithmetic_op(doubleType, code); break;
       case Bytecodes::_imul           : arithmetic_op(intType   , code); break;
       case Bytecodes::_lmul           : arithmetic_op(longType  , code); break;
       case Bytecodes::_fmul           : arithmetic_op(floatType , code); break;
       case Bytecodes::_dmul           : arithmetic_op(doubleType, code); break;
       case Bytecodes::_idiv           : arithmetic_op(intType   , code, copy_state_for_exception()); break;
       case Bytecodes::_ldiv           : arithmetic_op(longType  , code, copy_state_for_exception()); break;
       case Bytecodes::_fdiv           : arithmetic_op(floatType , code); break;
       case Bytecodes::_ddiv           : arithmetic_op(doubleType, code); break;
       case Bytecodes::_irem           : arithmetic_op(intType   , code, copy_state_for_exception()); break;
       case Bytecodes::_lrem           : arithmetic_op(longType  , code, copy_state_for_exception()); break;
       case Bytecodes::_frem           : arithmetic_op(floatType , code); break;
       case Bytecodes::_drem           : arithmetic_op(doubleType, code); break;
       case Bytecodes::_ineg           : negate_op(intType   ); break;
       case Bytecodes::_lneg           : negate_op(longType  ); break;
       case Bytecodes::_fneg           : negate_op(floatType ); break;
       case Bytecodes::_dneg           : negate_op(doubleType); break;
       case Bytecodes::_ishl           : shift_op(intType , code); break;
       case Bytecodes::_lshl           : shift_op(longType, code); break;
       case Bytecodes::_ishr           : shift_op(intType , code); break;
       case Bytecodes::_lshr           : shift_op(longType, code); break;
       case Bytecodes::_iushr          : shift_op(intType , code); break;
       case Bytecodes::_lushr          : shift_op(longType, code); break;
       case Bytecodes::_iand           : logic_op(intType , code); break;
       case Bytecodes::_land           : logic_op(longType, code); break;
       case Bytecodes::_ior            : logic_op(intType , code); break;
       case Bytecodes::_lor            : logic_op(longType, code); break;
       case Bytecodes::_ixor           : logic_op(intType , code); break;
       case Bytecodes::_lxor           : logic_op(longType, code); break;
       case Bytecodes::_iinc           : increment(); break;
       case Bytecodes::_i2l            : convert(code, T_INT   , T_LONG  ); break;
       case Bytecodes::_i2f            : convert(code, T_INT   , T_FLOAT ); break;
       case Bytecodes::_i2d            : convert(code, T_INT   , T_DOUBLE); break;
       case Bytecodes::_l2i            : convert(code, T_LONG  , T_INT   ); break;
       case Bytecodes::_l2f            : convert(code, T_LONG  , T_FLOAT ); break;
       case Bytecodes::_l2d            : convert(code, T_LONG  , T_DOUBLE); break;
       case Bytecodes::_f2i            : convert(code, T_FLOAT , T_INT   ); break;
       case Bytecodes::_f2l            : convert(code, T_FLOAT , T_LONG  ); break;
       case Bytecodes::_f2d            : convert(code, T_FLOAT , T_DOUBLE); break;
       case Bytecodes::_d2i            : convert(code, T_DOUBLE, T_INT   ); break;
       case Bytecodes::_d2l            : convert(code, T_DOUBLE, T_LONG  ); break;
       case Bytecodes::_d2f            : convert(code, T_DOUBLE, T_FLOAT ); break;
       case Bytecodes::_i2b            : convert(code, T_INT   , T_BYTE  ); break;
       case Bytecodes::_i2c            : convert(code, T_INT   , T_CHAR  ); break;
       case Bytecodes::_i2s            : convert(code, T_INT   , T_SHORT ); break;
       case Bytecodes::_lcmp           : compare_op(longType  , code); break;
       case Bytecodes::_fcmpl          : compare_op(floatType , code); break;
       case Bytecodes::_fcmpg          : compare_op(floatType , code); break;
       case Bytecodes::_dcmpl          : compare_op(doubleType, code); break;
       case Bytecodes::_dcmpg          : compare_op(doubleType, code); break;
       case Bytecodes::_ifeq           : if_zero(intType   , If::eql); break;
       case Bytecodes::_ifne           : if_zero(intType   , If::neq); break;
       case Bytecodes::_iflt           : if_zero(intType   , If::lss); break;
       case Bytecodes::_ifge           : if_zero(intType   , If::geq); break;
       case Bytecodes::_ifgt           : if_zero(intType   , If::gtr); break;
       case Bytecodes::_ifle           : if_zero(intType   , If::leq); break;
       case Bytecodes::_if_icmpeq      : if_same(intType   , If::eql); break;
       case Bytecodes::_if_icmpne      : if_same(intType   , If::neq); break;
       case Bytecodes::_if_icmplt      : if_same(intType   , If::lss); break;
       case Bytecodes::_if_icmpge      : if_same(intType   , If::geq); break;
       case Bytecodes::_if_icmpgt      : if_same(intType   , If::gtr); break;
       case Bytecodes::_if_icmple      : if_same(intType   , If::leq); break;
       case Bytecodes::_if_acmpeq      : if_same(objectType, If::eql); break;
       case Bytecodes::_if_acmpne      : if_same(objectType, If::neq); break;
       case Bytecodes::_goto           : _goto(s.cur_bci(), s.get_dest()); break;
       case Bytecodes::_jsr            : jsr(s.get_dest()); break;
       case Bytecodes::_ret            : ret(s.get_index()); break;
       case Bytecodes::_tableswitch    : table_switch(); break;
       case Bytecodes::_lookupswitch   : lookup_switch(); break;
       case Bytecodes::_ireturn        : method_return(ipop()); break;
       case Bytecodes::_lreturn        : method_return(lpop()); break;
       case Bytecodes::_freturn        : method_return(fpop()); break;
       case Bytecodes::_dreturn        : method_return(dpop()); break;
       case Bytecodes::_areturn        : method_return(apop()); break;
       case Bytecodes::_return         : method_return(NULL  ); break;
       case Bytecodes::_getstatic      : // fall through
       case Bytecodes::_putstatic      : // fall through
       case Bytecodes::_getfield       : // fall through
       case Bytecodes::_putfield       : access_field(code); break;
       case Bytecodes::_invokevirtual  : // fall through
       case Bytecodes::_invokespecial  : // fall through
       case Bytecodes::_invokestatic   : // fall through
       case Bytecodes::_invokedynamic  : // fall through
       case Bytecodes::_invokeinterface: invoke(code); break;
       case Bytecodes::_new            : new_instance(s.get_index_u2()); break;
       case Bytecodes::_newarray       : new_type_array(); break;
       case Bytecodes::_anewarray      : new_object_array(); break;
       case Bytecodes::_arraylength    : { ValueStack* state_before = copy_state_for_exception(); ipush(append(new ArrayLength(apop(), state_before))); break; }
       case Bytecodes::_athrow         : throw_op(s.cur_bci()); break;
       case Bytecodes::_checkcast      : check_cast(s.get_index_u2()); break;
       case Bytecodes::_instanceof     : instance_of(s.get_index_u2()); break;
       case Bytecodes::_monitorenter   : monitorenter(apop(), s.cur_bci()); break;
       case Bytecodes::_monitorexit    : monitorexit (apop(), s.cur_bci()); break;
       case Bytecodes::_wide           : ShouldNotReachHere(); break;
       case Bytecodes::_multianewarray : new_multi_array(s.cur_bcp()[3]); break;
       case Bytecodes::_ifnull         : if_null(objectType, If::eql); break;
       case Bytecodes::_ifnonnull      : if_null(objectType, If::neq); break;
       case Bytecodes::_goto_w         : _goto(s.cur_bci(), s.get_far_dest()); break;
       case Bytecodes::_jsr_w          : jsr(s.get_far_dest()); break;
       case Bytecodes::_breakpoint     : BAILOUT_("concurrent setting of breakpoint", NULL);
       default                         : ShouldNotReachHere(); break;
     }
     // save current bci to setup Goto at the end
     prev_bci = s.cur_bci();
   }
   CHECK_BAILOUT_(NULL);
   // stop processing of this block (see try_inline_full)
   if (_skip_block) {
     _skip_block = false;
     assert(_last && _last->as_BlockEnd(), "");
     return _last->as_BlockEnd();
   }
   // if there are any, check if last instruction is a BlockEnd instruction
   BlockEnd* end = last()->as_BlockEnd();
   if (end == NULL) {
     // all blocks must end with a BlockEnd instruction => add a Goto
     end = new Goto(block_at(s.cur_bci()), false);
     append(end);
   }
   assert(end == last()->as_BlockEnd(), "inconsistency");
   assert(end->state() != NULL, "state must already be present");
   assert(end->as_Return() == NULL || end->as_Throw() == NULL || end->state()->stack_size() == 0, "stack not needed for return and throw");
   // connect to begin & set state
   // NOTE that inlining may have changed the block we are parsing
   block()->set_end(end);
   // propagate state
   for (int i = end->number_of_sux() - 1; i >= 0; i--) {
     BlockBegin* sux = end->sux_at(i);
     assert(sux->is_predecessor(block()), "predecessor missing");
     // be careful, bailout if bytecodes are strange
     if (!sux->try_merge(end->state())) BAILOUT_("block join failed", NULL);
     scope_data()->add_to_work_list(end->sux_at(i));
   }
   scope_data()->set_stream(NULL);
   // done
   return end;
 }
 void GraphBuilder::iterate_all_blocks(bool start_in_current_block_for_inlining) {
   do {
     if (start_in_current_block_for_inlining && !bailed_out()) {
       iterate_bytecodes_for_block(0);
       start_in_current_block_for_inlining = false;
     } else {
       BlockBegin* b;
       while ((b = scope_data()->remove_from_work_list()) != NULL) {
         if (!b->is_set(BlockBegin::was_visited_flag)) {
           if (b->is_set(BlockBegin::osr_entry_flag)) {
             // we're about to parse the osr entry block, so make sure
             // we setup the OSR edge leading into this block so that
             // Phis get setup correctly.
             setup_osr_entry_block();
             // this is no longer the osr entry block, so clear it.
             b->clear(BlockBegin::osr_entry_flag);
           }
           b->set(BlockBegin::was_visited_flag);
           connect_to_end(b);
         }
       }
     }
   } while (!bailed_out() && !scope_data()->is_work_list_empty());
 }
 bool GraphBuilder::_can_trap      [Bytecodes::number_of_java_codes];
 void GraphBuilder::initialize() {
   // the following bytecodes are assumed to potentially
   // throw exceptions in compiled code - note that e.g.
   // monitorexit & the return bytecodes do not throw
   // exceptions since monitor pairing proved that they
   // succeed (if monitor pairing succeeded)
   Bytecodes::Code can_trap_list[] =
     { Bytecodes::_ldc
     , Bytecodes::_ldc_w
     , Bytecodes::_ldc2_w
     , Bytecodes::_iaload
     , Bytecodes::_laload
     , Bytecodes::_faload
     , Bytecodes::_daload
     , Bytecodes::_aaload
     , Bytecodes::_baload
     , Bytecodes::_caload
     , Bytecodes::_saload
     , Bytecodes::_iastore
     , Bytecodes::_lastore
     , Bytecodes::_fastore
     , Bytecodes::_dastore
     , Bytecodes::_aastore
     , Bytecodes::_bastore
     , Bytecodes::_castore
     , Bytecodes::_sastore
     , Bytecodes::_idiv
     , Bytecodes::_ldiv
     , Bytecodes::_irem
     , Bytecodes::_lrem
     , Bytecodes::_getstatic
     , Bytecodes::_putstatic
     , Bytecodes::_getfield
     , Bytecodes::_putfield
     , Bytecodes::_invokevirtual
     , Bytecodes::_invokespecial
     , Bytecodes::_invokestatic
     , Bytecodes::_invokedynamic
     , Bytecodes::_invokeinterface
     , Bytecodes::_new
     , Bytecodes::_newarray
     , Bytecodes::_anewarray
     , Bytecodes::_arraylength
     , Bytecodes::_athrow
     , Bytecodes::_checkcast
     , Bytecodes::_instanceof
     , Bytecodes::_monitorenter
     , Bytecodes::_multianewarray
     };
   // inititialize trap tables
   for (int i = 0; i < Bytecodes::number_of_java_codes; i++) {
     _can_trap[i] = false;
   }
   // set standard trap info
   for (uint j = 0; j < ARRAY_SIZE(can_trap_list); j++) {
     _can_trap[can_trap_list[j]] = true;
   }
 }
 BlockBegin* GraphBuilder::header_block(BlockBegin* entry, BlockBegin::Flag f, ValueStack* state) {
   assert(entry->is_set(f), "entry/flag mismatch");
   // create header block
   BlockBegin* h = new BlockBegin(entry->bci());
   h->set_depth_first_number(0);
   Value l = h;
   BlockEnd* g = new Goto(entry, false);
   l->set_next(g, entry->bci());
   h->set_end(g);
   h->set(f);
   // setup header block end state
   ValueStack* s = state->copy(ValueStack::StateAfter, entry->bci()); // can use copy since stack is empty (=> no phis)
   assert(s->stack_is_empty(), "must have empty stack at entry point");
   g->set_state(s);
   return h;
 }
 BlockBegin* GraphBuilder::setup_start_block(int osr_bci, BlockBegin* std_entry, BlockBegin* osr_entry, ValueStack* state) {
   BlockBegin* start = new BlockBegin(0);
   // This code eliminates the empty start block at the beginning of
   // each method.  Previously, each method started with the
   // start-block created below, and this block was followed by the
   // header block that was always empty.  This header block is only
   // necesary if std_entry is also a backward branch target because
   // then phi functions may be necessary in the header block.  It's
   // also necessary when profiling so that there's a single block that
   // can increment the interpreter_invocation_count.
   BlockBegin* new_header_block;
   if (std_entry->number_of_preds() > 0 || count_invocations() || count_backedges()) {
     new_header_block = header_block(std_entry, BlockBegin::std_entry_flag, state);
   } else {
     new_header_block = std_entry;
   }
   // setup start block (root for the IR graph)
   Base* base =
     new Base(
       new_header_block,
       osr_entry
     );
   start->set_next(base, 0);
   start->set_end(base);
   // create & setup state for start block
   start->set_state(state->copy(ValueStack::StateAfter, std_entry->bci()));
   base->set_state(state->copy(ValueStack::StateAfter, std_entry->bci()));
   if (base->std_entry()->state() == NULL) {
     // setup states for header blocks
     base->std_entry()->merge(state);
   }
   assert(base->std_entry()->state() != NULL, "");
   return start;
 }
 void GraphBuilder::setup_osr_entry_block() {
   assert(compilation()->is_osr_compile(), "only for osrs");
   int osr_bci = compilation()->osr_bci();
   ciBytecodeStream s(method());
   s.reset_to_bci(osr_bci);
   s.next();
   scope_data()->set_stream(&s);
   // create a new block to be the osr setup code
   _osr_entry = new BlockBegin(osr_bci);
   _osr_entry->set(BlockBegin::osr_entry_flag);
   _osr_entry->set_depth_first_number(0);
   BlockBegin* target = bci2block()->at(osr_bci);
   assert(target != NULL && target->is_set(BlockBegin::osr_entry_flag), "must be there");
   // the osr entry has no values for locals
   ValueStack* state = target->state()->copy();
   _osr_entry->set_state(state);
   kill_all();
   _block = _osr_entry;
   _state = _osr_entry->state()->copy();
   assert(_state->bci() == osr_bci, "mismatch");
   _last  = _osr_entry;
   Value e = append(new OsrEntry());
   e->set_needs_null_check(false);
   // OSR buffer is
   //
   // locals[nlocals-1..0]
   // monitors[number_of_locks-1..0]
   //
   // locals is a direct copy of the interpreter frame so in the osr buffer
   // so first slot in the local array is the last local from the interpreter
   // and last slot is local[0] (receiver) from the interpreter
   //
   // Similarly with locks. The first lock slot in the osr buffer is the nth lock
   // from the interpreter frame, the nth lock slot in the osr buffer is 0th lock
   // in the interpreter frame (the method lock if a sync method)
   // Initialize monitors in the compiled activation.
   int index;
   Value local;
   // find all the locals that the interpreter thinks contain live oops
   const BitMap live_oops = method()->live_local_oops_at_bci(osr_bci);
   // compute the offset into the locals so that we can treat the buffer
   // as if the locals were still in the interpreter frame
   int locals_offset = BytesPerWord * (method()->max_locals() - 1);
   for_each_local_value(state, index, local) {
     int offset = locals_offset - (index + local->type()->size() - 1) * BytesPerWord;
     Value get;
     if (local->type()->is_object_kind() && !live_oops.at(index)) {
       // The interpreter thinks this local is dead but the compiler
       // doesn't so pretend that the interpreter passed in null.
       get = append(new Constant(objectNull));
     } else {
       get = append(new UnsafeGetRaw(as_BasicType(local->type()), e,
                                     append(new Constant(new IntConstant(offset))),
 ,
                                     true /*unaligned*/, true /*wide*/));
     }
     _state->store_local(index, get);
   }
   // the storage for the OSR buffer is freed manually in the LIRGenerator.
   assert(state->caller_state() == NULL, "should be top scope");
   state->clear_locals();
   Goto* g = new Goto(target, false);
   append(g);
   _osr_entry->set_end(g);
   target->merge(_osr_entry->end()->state());
   scope_data()->set_stream(NULL);
 }
 ValueStack* GraphBuilder::state_at_entry() {
   ValueStack* state = new ValueStack(scope(), NULL);
   // Set up locals for receiver
   int idx = 0;
   if (!method()->is_static()) {
     // we should always see the receiver
     state->store_local(idx, new Local(objectType, idx));
     idx = 1;
   }
   // Set up locals for incoming arguments
   ciSignature* sig = method()->signature();
   for (int i = 0; i < sig->count(); i++) {
     ciType* type = sig->type_at(i);
     BasicType basic_type = type->basic_type();
     // don't allow T_ARRAY to propagate into locals types
     if (basic_type == T_ARRAY) basic_type = T_OBJECT;
     ValueType* vt = as_ValueType(basic_type);
     state->store_local(idx, new Local(vt, idx));
     idx += type->size();
   }
   // lock synchronized method
   if (method()->is_synchronized()) {
     state->lock(NULL);
   }
   return state;
 }
 GraphBuilder::GraphBuilder(Compilation* compilation, IRScope* scope)
   : _scope_data(NULL)
   , _instruction_count(0)
   , _osr_entry(NULL)
   , _memory(new MemoryBuffer())
   , _compilation(compilation)
   , _inline_bailout_msg(NULL)
 {
   int osr_bci = compilation->osr_bci();
   // determine entry points and bci2block mapping
   BlockListBuilder blm(compilation, scope, osr_bci);
   CHECK_BAILOUT();
   BlockList* bci2block = blm.bci2block();
   BlockBegin* start_block = bci2block->at(0);
   push_root_scope(scope, bci2block, start_block);
   // setup state for std entry
   _initial_state = state_at_entry();
   start_block->merge(_initial_state);
   // complete graph
   _vmap        = new ValueMap();
   switch (scope->method()->intrinsic_id()) {
   case vmIntrinsics::_dabs          : // fall through
   case vmIntrinsics::_dsqrt         : // fall through
   case vmIntrinsics::_dsin          : // fall through
   case vmIntrinsics::_dcos          : // fall through
   case vmIntrinsics::_dtan          : // fall through
   case vmIntrinsics::_dlog          : // fall through
   case vmIntrinsics::_dlog10        : // fall through
     {
       // Compiles where the root method is an intrinsic need a special
       // compilation environment because the bytecodes for the method
       // shouldn't be parsed during the compilation, only the special
       // Intrinsic node should be emitted.  If this isn't done the the
       // code for the inlined version will be different than the root
       // compiled version which could lead to monotonicity problems on
       // intel.
       // Set up a stream so that appending instructions works properly.
       ciBytecodeStream s(scope->method());
       s.reset_to_bci(0);
       scope_data()->set_stream(&s);
       s.next();
       // setup the initial block state
       _block = start_block;
       _state = start_block->state()->copy_for_parsing();
       _last  = start_block;
       load_local(doubleType, 0);
       // Emit the intrinsic node.
       bool result = try_inline_intrinsics(scope->method());
       if (!result) BAILOUT("failed to inline intrinsic");
       method_return(dpop());
       // connect the begin and end blocks and we're all done.
       BlockEnd* end = last()->as_BlockEnd();
       block()->set_end(end);
       break;
     }
   default:
     scope_data()->add_to_work_list(start_block);
     iterate_all_blocks();
     break;
   }
   CHECK_BAILOUT();
   _start = setup_start_block(osr_bci, start_block, _osr_entry, _initial_state);
   eliminate_redundant_phis(_start);
   NOT_PRODUCT(if (PrintValueNumbering && Verbose) print_stats());
   // for osr compile, bailout if some requirements are not fulfilled
   if (osr_bci != -1) {
     BlockBegin* osr_block = blm.bci2block()->at(osr_bci);
     assert(osr_block->is_set(BlockBegin::was_visited_flag),"osr entry must have been visited for osr compile");
     // check if osr entry point has empty stack - we cannot handle non-empty stacks at osr entry points
     if (!osr_block->state()->stack_is_empty()) {
       BAILOUT("stack not empty at OSR entry point");
     }
   }
 #ifndef PRODUCT
   if (PrintCompilation && Verbose) tty->print_cr("Created %d Instructions", _instruction_count);
 #endif
 }
 ValueStack* GraphBuilder::copy_state_before() {
   return copy_state_before_with_bci(bci());
 }
 ValueStack* GraphBuilder::copy_state_exhandling() {
   return copy_state_exhandling_with_bci(bci());
 }
 ValueStack* GraphBuilder::copy_state_for_exception() {
   return copy_state_for_exception_with_bci(bci());
 }
 ValueStack* GraphBuilder::copy_state_before_with_bci(int bci) {
   return state()->copy(ValueStack::StateBefore, bci);
 }
 ValueStack* GraphBuilder::copy_state_exhandling_with_bci(int bci) {
   if (!has_handler()) return NULL;
   return state()->copy(ValueStack::StateBefore, bci);
 }
 ValueStack* GraphBuilder::copy_state_for_exception_with_bci(int bci) {
   ValueStack* s = copy_state_exhandling_with_bci(bci);
   if (s == NULL) {
     if (_compilation->env()->jvmti_can_access_local_variables()) {
       s = state()->copy(ValueStack::ExceptionState, bci);
     } else {
       s = state()->copy(ValueStack::EmptyExceptionState, bci);
     }
   }
   return s;
 }
 int GraphBuilder::recursive_inline_level(ciMethod* cur_callee) const {
   int recur_level = 0;
   for (IRScope* s = scope(); s != NULL; s = s->caller()) {
     if (s->method() == cur_callee) {
       ++recur_level;
     }
   }
   return recur_level;
 }
 bool GraphBuilder::try_inline(ciMethod* callee, bool holder_known) {
   // Clear out any existing inline bailout condition
   clear_inline_bailout();
   if (callee->should_exclude()) {
     // callee is excluded
     INLINE_BAILOUT("excluded by CompilerOracle")
   } else if (!callee->can_be_compiled()) {
     // callee is not compilable (prob. has breakpoints)
     INLINE_BAILOUT("not compilable")
   } else if (callee->intrinsic_id() != vmIntrinsics::_none && try_inline_intrinsics(callee)) {
     // intrinsics can be native or not
     return true;
   } else if (callee->is_native()) {
     // non-intrinsic natives cannot be inlined
     INLINE_BAILOUT("non-intrinsic native")
   } else if (callee->is_abstract()) {
     INLINE_BAILOUT("abstract")
   } else {
     return try_inline_full(callee, holder_known);
   }
 }
 bool GraphBuilder::try_inline_intrinsics(ciMethod* callee) {
   if (!InlineNatives           ) INLINE_BAILOUT("intrinsic method inlining disabled");
   if (callee->is_synchronized()) {
     // We don't currently support any synchronized intrinsics
     return false;
   }
   // callee seems like a good candidate
   // determine id
   bool preserves_state = false;
   bool cantrap = true;
   vmIntrinsics::ID id = callee->intrinsic_id();
   switch (id) {
     case vmIntrinsics::_arraycopy     :
       if (!InlineArrayCopy) return false;
       break;
     case vmIntrinsics::_currentTimeMillis:
     case vmIntrinsics::_nanoTime:
       preserves_state = true;
       cantrap = false;
       break;
     case vmIntrinsics::_floatToRawIntBits   :
     case vmIntrinsics::_intBitsToFloat      :
     case vmIntrinsics::_doubleToRawLongBits :
     case vmIntrinsics::_longBitsToDouble    :
       if (!InlineMathNatives) return false;
       preserves_state = true;
       cantrap = false;
       break;
     case vmIntrinsics::_getClass      :
       if (!InlineClassNatives) return false;
       preserves_state = true;
       break;
     case vmIntrinsics::_currentThread :
       if (!InlineThreadNatives) return false;
       preserves_state = true;
       cantrap = false;
       break;
     case vmIntrinsics::_dabs          : // fall through
     case vmIntrinsics::_dsqrt         : // fall through
     case vmIntrinsics::_dsin          : // fall through
     case vmIntrinsics::_dcos          : // fall through
     case vmIntrinsics::_dtan          : // fall through
     case vmIntrinsics::_dlog          : // fall through
     case vmIntrinsics::_dlog10        : // fall through
       if (!InlineMathNatives) return false;
       cantrap = false;
       preserves_state = true;
       break;
     // sun/misc/AtomicLong.attemptUpdate
     case vmIntrinsics::_attemptUpdate :
       if (!VM_Version::supports_cx8()) return false;
       if (!InlineAtomicLong) return false;
       preserves_state = true;
       break;
     // Use special nodes for Unsafe instructions so we can more easily
     // perform an address-mode optimization on the raw variants
     case vmIntrinsics::_getObject : return append_unsafe_get_obj(callee, T_OBJECT,  false);
     case vmIntrinsics::_getBoolean: return append_unsafe_get_obj(callee, T_BOOLEAN, false);
     case vmIntrinsics::_getByte   : return append_unsafe_get_obj(callee, T_BYTE,    false);
     case vmIntrinsics::_getShort  : return append_unsafe_get_obj(callee, T_SHORT,   false);
     case vmIntrinsics::_getChar   : return append_unsafe_get_obj(callee, T_CHAR,    false);
     case vmIntrinsics::_getInt    : return append_unsafe_get_obj(callee, T_INT,     false);
     case vmIntrinsics::_getLong   : return append_unsafe_get_obj(callee, T_LONG,    false);
     case vmIntrinsics::_getFloat  : return append_unsafe_get_obj(callee, T_FLOAT,   false);
     case vmIntrinsics::_getDouble : return append_unsafe_get_obj(callee, T_DOUBLE,  false);
     case vmIntrinsics::_putObject : return append_unsafe_put_obj(callee, T_OBJECT,  false);
     case vmIntrinsics::_putBoolean: return append_unsafe_put_obj(callee, T_BOOLEAN, false);
     case vmIntrinsics::_putByte   : return append_unsafe_put_obj(callee, T_BYTE,    false);
     case vmIntrinsics::_putShort  : return append_unsafe_put_obj(callee, T_SHORT,   false);
     case vmIntrinsics::_putChar   : return append_unsafe_put_obj(callee, T_CHAR,    false);
     case vmIntrinsics::_putInt    : return append_unsafe_put_obj(callee, T_INT,     false);
     case vmIntrinsics::_putLong   : return append_unsafe_put_obj(callee, T_LONG,    false);
     case vmIntrinsics::_putFloat  : return append_unsafe_put_obj(callee, T_FLOAT,   false);
     case vmIntrinsics::_putDouble : return append_unsafe_put_obj(callee, T_DOUBLE,  false);
     case vmIntrinsics::_getObjectVolatile : return append_unsafe_get_obj(callee, T_OBJECT,  true);
     case vmIntrinsics::_getBooleanVolatile: return append_unsafe_get_obj(callee, T_BOOLEAN, true);
     case vmIntrinsics::_getByteVolatile   : return append_unsafe_get_obj(callee, T_BYTE,    true);
     case vmIntrinsics::_getShortVolatile  : return append_unsafe_get_obj(callee, T_SHORT,   true);
     case vmIntrinsics::_getCharVolatile   : return append_unsafe_get_obj(callee, T_CHAR,    true);
     case vmIntrinsics::_getIntVolatile    : return append_unsafe_get_obj(callee, T_INT,     true);
     case vmIntrinsics::_getLongVolatile   : return append_unsafe_get_obj(callee, T_LONG,    true);
     case vmIntrinsics::_getFloatVolatile  : return append_unsafe_get_obj(callee, T_FLOAT,   true);
     case vmIntrinsics::_getDoubleVolatile : return append_unsafe_get_obj(callee, T_DOUBLE,  true);
     case vmIntrinsics::_putObjectVolatile : return append_unsafe_put_obj(callee, T_OBJECT,  true);
     case vmIntrinsics::_putBooleanVolatile: return append_unsafe_put_obj(callee, T_BOOLEAN, true);
     case vmIntrinsics::_putByteVolatile   : return append_unsafe_put_obj(callee, T_BYTE,    true);
     case vmIntrinsics::_putShortVolatile  : return append_unsafe_put_obj(callee, T_SHORT,   true);
     case vmIntrinsics::_putCharVolatile   : return append_unsafe_put_obj(callee, T_CHAR,    true);
     case vmIntrinsics::_putIntVolatile    : return append_unsafe_put_obj(callee, T_INT,     true);
     case vmIntrinsics::_putLongVolatile   : return append_unsafe_put_obj(callee, T_LONG,    true);
     case vmIntrinsics::_putFloatVolatile  : return append_unsafe_put_obj(callee, T_FLOAT,   true);
     case vmIntrinsics::_putDoubleVolatile : return append_unsafe_put_obj(callee, T_DOUBLE,  true);
     case vmIntrinsics::_getByte_raw   : return append_unsafe_get_raw(callee, T_BYTE);
     case vmIntrinsics::_getShort_raw  : return append_unsafe_get_raw(callee, T_SHORT);
     case vmIntrinsics::_getChar_raw   : return append_unsafe_get_raw(callee, T_CHAR);
     case vmIntrinsics::_getInt_raw    : return append_unsafe_get_raw(callee, T_INT);
     case vmIntrinsics::_getLong_raw   : return append_unsafe_get_raw(callee, T_LONG);
     case vmIntrinsics::_getFloat_raw  : return append_unsafe_get_raw(callee, T_FLOAT);
     case vmIntrinsics::_getDouble_raw : return append_unsafe_get_raw(callee, T_DOUBLE);
     case vmIntrinsics::_putByte_raw   : return append_unsafe_put_raw(callee, T_BYTE);
     case vmIntrinsics::_putShort_raw  : return append_unsafe_put_raw(callee, T_SHORT);
     case vmIntrinsics::_putChar_raw   : return append_unsafe_put_raw(callee, T_CHAR);
     case vmIntrinsics::_putInt_raw    : return append_unsafe_put_raw(callee, T_INT);
     case vmIntrinsics::_putLong_raw   : return append_unsafe_put_raw(callee, T_LONG);
     case vmIntrinsics::_putFloat_raw  : return append_unsafe_put_raw(callee, T_FLOAT);
     case vmIntrinsics::_putDouble_raw : return append_unsafe_put_raw(callee, T_DOUBLE);
     case vmIntrinsics::_prefetchRead        : return append_unsafe_prefetch(callee, false, false);
     case vmIntrinsics::_prefetchWrite       : return append_unsafe_prefetch(callee, false, true);
     case vmIntrinsics::_prefetchReadStatic  : return append_unsafe_prefetch(callee, true,  false);
     case vmIntrinsics::_prefetchWriteStatic : return append_unsafe_prefetch(callee, true,  true);
     case vmIntrinsics::_checkIndex    :
       if (!InlineNIOCheckIndex) return false;
       preserves_state = true;
       break;
     case vmIntrinsics::_putOrderedObject : return append_unsafe_put_obj(callee, T_OBJECT,  true);
     case vmIntrinsics::_putOrderedInt    : return append_unsafe_put_obj(callee, T_INT,     true);
     case vmIntrinsics::_putOrderedLong   : return append_unsafe_put_obj(callee, T_LONG,    true);
     case vmIntrinsics::_compareAndSwapLong:
       if (!VM_Version::supports_cx8()) return false;
       // fall through
     case vmIntrinsics::_compareAndSwapInt:
     case vmIntrinsics::_compareAndSwapObject:
       append_unsafe_CAS(callee);
       return true;
     default                       : return false; // do not inline
   }
   // create intrinsic node
   const bool has_receiver = !callee->is_static();
   ValueType* result_type = as_ValueType(callee->return_type());
   ValueStack* state_before = copy_state_for_exception();
   Values* args = state()->pop_arguments(callee->arg_size());
   if (is_profiling()) {
     // Don't profile in the special case where the root method
     // is the intrinsic
     if (callee != method()) {
       // Note that we'd collect profile data in this method if we wanted it.
       compilation()->set_would_profile(true);
       if (profile_calls()) {
         Value recv = NULL;
         if (has_receiver) {
           recv = args->at(0);
           null_check(recv);
         }
         profile_call(recv, NULL);
       }
     }
   }
   Intrinsic* result = new Intrinsic(result_type, id, args, has_receiver, state_before,
                                     preserves_state, cantrap);
   // append instruction & push result
   Value value = append_split(result);
   if (result_type != voidType) push(result_type, value);
 #ifndef PRODUCT
   // printing
   if (PrintInlining) {
     print_inline_result(callee, true);
   }
 #endif
   // done
   return true;
 }
 bool GraphBuilder::try_inline_jsr(int jsr_dest_bci) {
   // Introduce a new callee continuation point - all Ret instructions
   // will be replaced with Gotos to this point.
   BlockBegin* cont = block_at(next_bci());
   assert(cont != NULL, "continuation must exist (BlockListBuilder starts a new block after a jsr");
   // Note: can not assign state to continuation yet, as we have to
   // pick up the state from the Ret instructions.
   // Push callee scope
   push_scope_for_jsr(cont, jsr_dest_bci);
   // Temporarily set up bytecode stream so we can append instructions
   // (only using the bci of this stream)
   scope_data()->set_stream(scope_data()->parent()->stream());
   BlockBegin* jsr_start_block = block_at(jsr_dest_bci);
   assert(jsr_start_block != NULL, "jsr start block must exist");
   assert(!jsr_start_block->is_set(BlockBegin::was_visited_flag), "should not have visited jsr yet");
   Goto* goto_sub = new Goto(jsr_start_block, false);
   // Must copy state to avoid wrong sharing when parsing bytecodes
   assert(jsr_start_block->state() == NULL, "should have fresh jsr starting block");
   jsr_start_block->set_state(copy_state_before_with_bci(jsr_dest_bci));
   append(goto_sub);
   _block->set_end(goto_sub);
   _last = _block = jsr_start_block;
   // Clear out bytecode stream
   scope_data()->set_stream(NULL);
   scope_data()->add_to_work_list(jsr_start_block);
   // Ready to resume parsing in subroutine
   iterate_all_blocks();
   // If we bailed out during parsing, return immediately (this is bad news)
   CHECK_BAILOUT_(false);
   // Detect whether the continuation can actually be reached. If not,
   // it has not had state set by the join() operations in
   // iterate_bytecodes_for_block()/ret() and we should not touch the
   // iteration state. The calling activation of
   // iterate_bytecodes_for_block will then complete normally.
   if (cont->state() != NULL) {
     if (!cont->is_set(BlockBegin::was_visited_flag)) {
       // add continuation to work list instead of parsing it immediately
       scope_data()->parent()->add_to_work_list(cont);
     }
   }
   assert(jsr_continuation() == cont, "continuation must not have changed");
   assert(!jsr_continuation()->is_set(BlockBegin::was_visited_flag) ||
          jsr_continuation()->is_set(BlockBegin::parser_loop_header_flag),
          "continuation can only be visited in case of backward branches");
   assert(_last && _last->as_BlockEnd(), "block must have end");
   // continuation is in work list, so end iteration of current block
   _skip_block = true;
   pop_scope_for_jsr();
   return true;
 }
 // Inline the entry of a synchronized method as a monitor enter and
 // register the exception handler which releases the monitor if an
 // exception is thrown within the callee. Note that the monitor enter
 // cannot throw an exception itself, because the receiver is
 // guaranteed to be non-null by the explicit null check at the
 // beginning of inlining.
 void GraphBuilder::inline_sync_entry(Value lock, BlockBegin* sync_handler) {
   assert(lock != NULL && sync_handler != NULL, "lock or handler missing");
   monitorenter(lock, SynchronizationEntryBCI);
   assert(_last->as_MonitorEnter() != NULL, "monitor enter expected");
   _last->set_needs_null_check(false);
   sync_handler->set(BlockBegin::exception_entry_flag);
   sync_handler->set(BlockBegin::is_on_work_list_flag);
   ciExceptionHandler* desc = new ciExceptionHandler(method()->holder(), 0, method()->code_size(), -1, 0);
   XHandler* h = new XHandler(desc);
   h->set_entry_block(sync_handler);
   scope_data()->xhandlers()->append(h);
   scope_data()->set_has_handler();
 }
 // If an exception is thrown and not handled within an inlined
 // synchronized method, the monitor must be released before the
 // exception is rethrown in the outer scope. Generate the appropriate
 // instructions here.
 void GraphBuilder::fill_sync_handler(Value lock, BlockBegin* sync_handler, bool default_handler) {
   BlockBegin* orig_block = _block;
   ValueStack* orig_state = _state;
   Instruction* orig_last = _last;
   _last = _block = sync_handler;
   _state = sync_handler->state()->copy();
   assert(sync_handler != NULL, "handler missing");
   assert(!sync_handler->is_set(BlockBegin::was_visited_flag), "is visited here");
   assert(lock != NULL || default_handler, "lock or handler missing");
   XHandler* h = scope_data()->xhandlers()->remove_last();
   assert(h->entry_block() == sync_handler, "corrupt list of handlers");
   block()->set(BlockBegin::was_visited_flag);
   Value exception = append_with_bci(new ExceptionObject(), SynchronizationEntryBCI);
   assert(exception->is_pinned(), "must be");
   int bci = SynchronizationEntryBCI;
   if (lock) {
     assert(state()->locks_size() > 0 && state()->lock_at(state()->locks_size() - 1) == lock, "lock is missing");
     if (!lock->is_linked()) {
       lock = append_with_bci(lock, -1);
     }
     // exit the monitor in the context of the synchronized method
     monitorexit(lock, SynchronizationEntryBCI);
     // exit the context of the synchronized method
     if (!default_handler) {
       pop_scope();
       bci = _state->caller_state()->bci();
       _state = _state->caller_state()->copy_for_parsing();
     }
   }
   // perform the throw as if at the the call site
   apush(exception);
   throw_op(bci);
   BlockEnd* end = last()->as_BlockEnd();
   block()->set_end(end);
   _block = orig_block;
   _state = orig_state;
   _last = orig_last;
 }
 bool GraphBuilder::try_inline_full(ciMethod* callee, bool holder_known) {
   assert(!callee->is_native(), "callee must not be native");
   if (count_backedges() && callee->has_loops()) {
     INLINE_BAILOUT("too complex for tiered");
   }
   // first perform tests of things it's not possible to inline
   if (callee->has_exception_handlers() &&
       !InlineMethodsWithExceptionHandlers) INLINE_BAILOUT("callee has exception handlers");
   if (callee->is_synchronized() &&
       !InlineSynchronizedMethods         ) INLINE_BAILOUT("callee is synchronized");
   if (!callee->holder()->is_initialized()) INLINE_BAILOUT("callee's klass not initialized yet");
   if (!callee->has_balanced_monitors())    INLINE_BAILOUT("callee's monitors do not match");
   // Proper inlining of methods with jsrs requires a little more work.
   if (callee->has_jsrs()                 ) INLINE_BAILOUT("jsrs not handled properly by inliner yet");
   // now perform tests that are based on flag settings
   if (inline_level() > MaxInlineLevel                         ) INLINE_BAILOUT("too-deep inlining");
   if (recursive_inline_level(callee) > MaxRecursiveInlineLevel) INLINE_BAILOUT("too-deep recursive inlining");
   if (callee->code_size() > max_inline_size()                 ) INLINE_BAILOUT("callee is too large");
   // don't inline throwable methods unless the inlining tree is rooted in a throwable class
   if (callee->name() == ciSymbol::object_initializer_name() &&
       callee->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) {
     // Throwable constructor call
     IRScope* top = scope();
     while (top->caller() != NULL) {
       top = top->caller();
     }
     if (!top->method()->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) {
       INLINE_BAILOUT("don't inline Throwable constructors");
     }
   }
   // When SSE2 is used on intel, then no special handling is needed
   // for strictfp because the enum-constant is fixed at compile time,
   // the check for UseSSE2 is needed here
   if (strict_fp_requires_explicit_rounding && UseSSE < 2 && method()->is_strict() != callee->is_strict()) {
     INLINE_BAILOUT("caller and callee have different strict fp requirements");
   }
   if (compilation()->env()->num_inlined_bytecodes() > DesiredMethodLimit) {
     INLINE_BAILOUT("total inlining greater than DesiredMethodLimit");
   }
   if (is_profiling() && !callee->ensure_method_data()) {
     INLINE_BAILOUT("mdo allocation failed");
   }
 #ifndef PRODUCT
       // printing
   if (PrintInlining) {
     print_inline_result(callee, true);
   }
 #endif
   // NOTE: Bailouts from this point on, which occur at the
   // GraphBuilder level, do not cause bailout just of the inlining but
   // in fact of the entire compilation.
   BlockBegin* orig_block = block();
   const int args_base = state()->stack_size() - callee->arg_size();
   assert(args_base >= 0, "stack underflow during inlining");
   // Insert null check if necessary
   Value recv = NULL;
   if (code() != Bytecodes::_invokestatic) {
     // note: null check must happen even if first instruction of callee does
     //       an implicit null check since the callee is in a different scope
     //       and we must make sure exception handling does the right thing
     assert(!callee->is_static(), "callee must not be static");
     assert(callee->arg_size() > 0, "must have at least a receiver");
     recv = state()->stack_at(args_base);
     null_check(recv);
   }
   if (is_profiling()) {
     // Note that we'd collect profile data in this method if we wanted it.
     // this may be redundant here...
     compilation()->set_would_profile(true);
     if (profile_calls()) {
       profile_call(recv, holder_known ? callee->holder() : NULL);
     }
     if (profile_inlined_calls()) {
       profile_invocation(callee, copy_state_before());
     }
   }
   // Introduce a new callee continuation point - if the callee has
   // more than one return instruction or the return does not allow
   // fall-through of control flow, all return instructions of the
   // callee will need to be replaced by Goto's pointing to this
   // continuation point.
   BlockBegin* cont = block_at(next_bci());
   bool continuation_existed = true;
   if (cont == NULL) {
     cont = new BlockBegin(next_bci());
     // low number so that continuation gets parsed as early as possible
     cont->set_depth_first_number(0);
 #ifndef PRODUCT
     if (PrintInitialBlockList) {
       tty->print_cr("CFG: created block %d (bci %d) as continuation for inline at bci %d",
                     cont->block_id(), cont->bci(), bci());
     }
 #endif
     continuation_existed = false;
   }
   // Record number of predecessors of continuation block before
   // inlining, to detect if inlined method has edges to its
   // continuation after inlining.
   int continuation_preds = cont->number_of_preds();
   // Push callee scope
   push_scope(callee, cont);
   // the BlockListBuilder for the callee could have bailed out
   CHECK_BAILOUT_(false);
   // Temporarily set up bytecode stream so we can append instructions
   // (only using the bci of this stream)
   scope_data()->set_stream(scope_data()->parent()->stream());
   // Pass parameters into callee state: add assignments
   // note: this will also ensure that all arguments are computed before being passed
   ValueStack* callee_state = state();
   ValueStack* caller_state = state()->caller_state();
   { int i = args_base;
     while (i < caller_state->stack_size()) {
       const int par_no = i - args_base;
       Value  arg = caller_state->stack_at_inc(i);
       // NOTE: take base() of arg->type() to avoid problems storing
       // constants
       store_local(callee_state, arg, arg->type()->base(), par_no);
     }
   }
   // Remove args from stack.
   // Note that we preserve locals state in case we can use it later
   // (see use of pop_scope() below)
   caller_state->truncate_stack(args_base);
   assert(callee_state->stack_size() == 0, "callee stack must be empty");
   Value lock;
   BlockBegin* sync_handler;
   // Inline the locking of the receiver if the callee is synchronized
   if (callee->is_synchronized()) {
     lock = callee->is_static() ? append(new Constant(new InstanceConstant(callee->holder()->java_mirror())))
                                : state()->local_at(0);
     sync_handler = new BlockBegin(SynchronizationEntryBCI);
     inline_sync_entry(lock, sync_handler);
   }
   BlockBegin* callee_start_block = block_at(0);
   if (callee_start_block != NULL) {
     assert(callee_start_block->is_set(BlockBegin::parser_loop_header_flag), "must be loop header");
     Goto* goto_callee = new Goto(callee_start_block, false);
     // The state for this goto is in the scope of the callee, so use
     // the entry bci for the callee instead of the call site bci.
     append_with_bci(goto_callee, 0);
     _block->set_end(goto_callee);
     callee_start_block->merge(callee_state);
     _last = _block = callee_start_block;
     scope_data()->add_to_work_list(callee_start_block);
   }
   // Clear out bytecode stream
   scope_data()->set_stream(NULL);
   // Ready to resume parsing in callee (either in the same block we
   // were in before or in the callee's start block)
   iterate_all_blocks(callee_start_block == NULL);
   // If we bailed out during parsing, return immediately (this is bad news)
   if (bailed_out()) return false;
   // iterate_all_blocks theoretically traverses in random order; in
   // practice, we have only traversed the continuation if we are
   // inlining into a subroutine
   assert(continuation_existed ||
          !continuation()->is_set(BlockBegin::was_visited_flag),
          "continuation should not have been parsed yet if we created it");
   // If we bailed out during parsing, return immediately (this is bad news)
   CHECK_BAILOUT_(false);
   // At this point we are almost ready to return and resume parsing of
   // the caller back in the GraphBuilder. The only thing we want to do
   // first is an optimization: during parsing of the callee we
   // generated at least one Goto to the continuation block. If we
   // generated exactly one, and if the inlined method spanned exactly
   // one block (and we didn't have to Goto its entry), then we snip
   // off the Goto to the continuation, allowing control to fall
   // through back into the caller block and effectively performing
   // block merging. This allows load elimination and CSE to take place
   // across multiple callee scopes if they are relatively simple, and
   // is currently essential to making inlining profitable.
   if (   num_returns() == 1
       && block() == orig_block
       && block() == inline_cleanup_block()) {
     _last = inline_cleanup_return_prev();
     _state = inline_cleanup_state();
   } else if (continuation_preds == cont->number_of_preds()) {
     // Inlining caused that the instructions after the invoke in the
     // caller are not reachable any more. So skip filling this block
     // with instructions!
     assert (cont == continuation(), "");
     assert(_last && _last->as_BlockEnd(), "");
     _skip_block = true;
   } else {
     // Resume parsing in continuation block unless it was already parsed.
     // Note that if we don't change _last here, iteration in
     // iterate_bytecodes_for_block will stop when we return.
     if (!continuation()->is_set(BlockBegin::was_visited_flag)) {
       // add continuation to work list instead of parsing it immediately
       assert(_last && _last->as_BlockEnd(), "");
       scope_data()->parent()->add_to_work_list(continuation());
       _skip_block = true;
     }
   }
   // Fill the exception handler for synchronized methods with instructions
   if (callee->is_synchronized() && sync_handler->state() != NULL) {
     fill_sync_handler(lock, sync_handler);
   } else {
     pop_scope();
   }
   compilation()->notice_inlined_method(callee);
   return true;
 }
 void GraphBuilder::inline_bailout(const char* msg) {
   assert(msg != NULL, "inline bailout msg must exist");
   _inline_bailout_msg = msg;
 }
 void GraphBuilder::clear_inline_bailout() {
   _inline_bailout_msg = NULL;
 }
 void GraphBuilder::push_root_scope(IRScope* scope, BlockList* bci2block, BlockBegin* start) {
   ScopeData* data = new ScopeData(NULL);
   data->set_scope(scope);
   data->set_bci2block(bci2block);
   _scope_data = data;
   _block = start;
 }
 void GraphBuilder::push_scope(ciMethod* callee, BlockBegin* continuation) {
   IRScope* callee_scope = new IRScope(compilation(), scope(), bci(), callee, -1, false);
   scope()->add_callee(callee_scope);
   BlockListBuilder blb(compilation(), callee_scope, -1);
   CHECK_BAILOUT();
   if (!blb.bci2block()->at(0)->is_set(BlockBegin::parser_loop_header_flag)) {
     // this scope can be inlined directly into the caller so remove
     // the block at bci 0.
     blb.bci2block()->at_put(0, NULL);
   }
   set_state(new ValueStack(callee_scope, state()->copy(ValueStack::CallerState, bci())));
   ScopeData* data = new ScopeData(scope_data());
   data->set_scope(callee_scope);
   data->set_bci2block(blb.bci2block());
   data->set_continuation(continuation);
   _scope_data = data;
 }
 void GraphBuilder::push_scope_for_jsr(BlockBegin* jsr_continuation, int jsr_dest_bci) {
   ScopeData* data = new ScopeData(scope_data());
   data->set_parsing_jsr();
   data->set_jsr_entry_bci(jsr_dest_bci);
   data->set_jsr_return_address_local(-1);
   // Must clone bci2block list as we will be mutating it in order to
   // properly clone all blocks in jsr region as well as exception
   // handlers containing rets
   BlockList* new_bci2block = new BlockList(bci2block()->length());
   new_bci2block->push_all(bci2block());
   data->set_bci2block(new_bci2block);
   data->set_scope(scope());
   data->setup_jsr_xhandlers();
   data->set_continuation(continuation());
   data->set_jsr_continuation(jsr_continuation);
   _scope_data = data;
 }
 void GraphBuilder::pop_scope() {
   int number_of_locks = scope()->number_of_locks();
   _scope_data = scope_data()->parent();
   // accumulate minimum number of monitor slots to be reserved
   scope()->set_min_number_of_locks(number_of_locks);
 }
 void GraphBuilder::pop_scope_for_jsr() {
   _scope_data = scope_data()->parent();
 }
 bool GraphBuilder::append_unsafe_get_obj(ciMethod* callee, BasicType t, bool is_volatile) {
   if (InlineUnsafeOps) {
     Values* args = state()->pop_arguments(callee->arg_size());
     null_check(args->at(0));
     Instruction* offset = args->at(2);
 #ifndef _LP64
     offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
 #endif
     Instruction* op = append(new UnsafeGetObject(t, args->at(1), offset, is_volatile));
     push(op->type(), op);
     compilation()->set_has_unsafe_access(true);
   }
   return InlineUnsafeOps;
 }
 bool GraphBuilder::append_unsafe_put_obj(ciMethod* callee, BasicType t, bool is_volatile) {
   if (InlineUnsafeOps) {
     Values* args = state()->pop_arguments(callee->arg_size());
     null_check(args->at(0));
     Instruction* offset = args->at(2);
 #ifndef _LP64
     offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
 #endif
     Instruction* op = append(new UnsafePutObject(t, args->at(1), offset, args->at(3), is_volatile));
     compilation()->set_has_unsafe_access(true);
     kill_all();
   }
   return InlineUnsafeOps;
 }
 bool GraphBuilder::append_unsafe_get_raw(ciMethod* callee, BasicType t) {
   if (InlineUnsafeOps) {
     Values* args = state()->pop_arguments(callee->arg_size());
     null_check(args->at(0));
     Instruction* op = append(new UnsafeGetRaw(t, args->at(1), false));
     push(op->type(), op);
     compilation()->set_has_unsafe_access(true);
   }
   return InlineUnsafeOps;
 }
 bool GraphBuilder::append_unsafe_put_raw(ciMethod* callee, BasicType t) {
   if (InlineUnsafeOps) {
     Values* args = state()->pop_arguments(callee->arg_size());
     null_check(args->at(0));
     Instruction* op = append(new UnsafePutRaw(t, args->at(1), args->at(2)));
     compilation()->set_has_unsafe_access(true);
   }
   return InlineUnsafeOps;
 }
 bool GraphBuilder::append_unsafe_prefetch(ciMethod* callee, bool is_static, bool is_store) {
   if (InlineUnsafeOps) {
     Values* args = state()->pop_arguments(callee->arg_size());
     int obj_arg_index = 1; // Assume non-static case
     if (is_static) {
       obj_arg_index = 0;
     } else {
       null_check(args->at(0));
     }
     Instruction* offset = args->at(obj_arg_index + 1);
 #ifndef _LP64
     offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
 #endif
     Instruction* op = is_store ? append(new UnsafePrefetchWrite(args->at(obj_arg_index), offset))
                                : append(new UnsafePrefetchRead (args->at(obj_arg_index), offset));
     compilation()->set_has_unsafe_access(true);
   }
   return InlineUnsafeOps;
 }
 void GraphBuilder::append_unsafe_CAS(ciMethod* callee) {
   ValueStack* state_before = copy_state_for_exception();
   ValueType* result_type = as_ValueType(callee->return_type());
   assert(result_type->is_int(), "int result");
   Values* args = state()->pop_arguments(callee->arg_size());
   // Pop off some args to speically handle, then push back
   Value newval = args->pop();
   Value cmpval = args->pop();
   Value offset = args->pop();
   Value src = args->pop();
   Value unsafe_obj = args->pop();
   // Separately handle the unsafe arg. It is not needed for code
   // generation, but must be null checked
   null_check(unsafe_obj);
 #ifndef _LP64
   offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
 #endif
   args->push(src);
   args->push(offset);
   args->push(cmpval);
   args->push(newval);
   // An unsafe CAS can alias with other field accesses, but we don't
   // know which ones so mark the state as no preserved.  This will
   // cause CSE to invalidate memory across it.
   bool preserves_state = false;
   Intrinsic* result = new Intrinsic(result_type, callee->intrinsic_id(), args, false, state_before, preserves_state);
   append_split(result);
   push(result_type, result);
   compilation()->set_has_unsafe_access(true);
 }
 #ifndef PRODUCT
 void GraphBuilder::print_inline_result(ciMethod* callee, bool res) {
   const char sync_char      = callee->is_synchronized()        ? 's' : ' ';
   const char exception_char = callee->has_exception_handlers() ? '!' : ' ';
   const char monitors_char  = callee->has_monitor_bytecodes()  ? 'm' : ' ';
   tty->print("     %c%c%c ", sync_char, exception_char, monitors_char);
   for (int i = 0; i < scope()->level(); i++) tty->print("  ");
   if (res) {
     tty->print("  ");
   } else {
     tty->print("- ");
   }
   tty->print("@ %d  ", bci());
   callee->print_short_name();
   tty->print(" (%d bytes)", callee->code_size());
   if (_inline_bailout_msg) {
     tty->print("  %s", _inline_bailout_msg);
   }
   tty->cr();
   if (res && CIPrintMethodCodes) {
     callee->print_codes();
   }
 }
 void GraphBuilder::print_stats() {
   vmap()->print();
 }
 #endif // PRODUCT
 void GraphBuilder::profile_call(Value recv, ciKlass* known_holder) {
   append(new ProfileCall(method(), bci(), recv, known_holder));
 }
 void GraphBuilder::profile_invocation(ciMethod* callee, ValueStack* state) {
   append(new ProfileInvoke(callee, state));
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/c1/c1_GraphBuilder.cpp@8012aa3ccede (annotated)

src/share/vm/c1/c1_GraphBuilder.cpp