jdk8-mips64-public/hotspot: src/share/vm/ci/bcEscapeAnalyzer.cpp@42d9a5f06728 (annotated)

src/share/vm/ci/bcEscapeAnalyzer.cpp@42d9a5f06728 (annotated)

src/share/vm/ci/bcEscapeAnalyzer.cpp

Wed, 21 May 2014 10:54:59 -0700

author: rasbold
date: Wed, 21 May 2014 10:54:59 -0700
changeset 6702: 42d9a5f06728
parent 6680: 78bbf4d43a14
child 6876: 710a3c8b516e
child 7443: 609faa407cfd
permissions: -rw-r--r--

8043354: OptimizePtrCompare too aggressive when allocations are present
Summary: In bcEscapeAnalyzer update the _allocated_escapes flag if a var escapes the method.
Reviewed-by: kvn

 /*
  * Copyright (c) 2005, 2014, 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 "ci/bcEscapeAnalyzer.hpp"
 #include "ci/ciConstant.hpp"
 #include "ci/ciField.hpp"
 #include "ci/ciMethodBlocks.hpp"
 #include "ci/ciStreams.hpp"
 #include "interpreter/bytecode.hpp"
 #include "utilities/bitMap.inline.hpp"
 #ifndef PRODUCT
   #define TRACE_BCEA(level, code)                                            \
     if (EstimateArgEscape && BCEATraceLevel >= level) {                        \
       code;                                                                  \
     }
 #else
   #define TRACE_BCEA(level, code)
 #endif
 // Maintain a map of which aguments a local variable or
 // stack slot may contain.  In addition to tracking
 // arguments, it tracks two special values, "allocated"
 // which represents any object allocated in the current
 // method, and "unknown" which is any other object.
 // Up to 30 arguments are handled, with the last one
 // representing summary information for any extra arguments
 class BCEscapeAnalyzer::ArgumentMap {
   uint  _bits;
   enum {MAXBIT = 29,
         ALLOCATED = 1,
         UNKNOWN = 2};
   uint int_to_bit(uint e) const {
     if (e > MAXBIT)
       e = MAXBIT;
     return (1 << (e + 2));
   }
 public:
   ArgumentMap()                         { _bits = 0;}
   void set_bits(uint bits)              { _bits = bits;}
   uint get_bits() const                 { return _bits;}
   void clear()                          { _bits = 0;}
   void set_all()                        { _bits = ~0u; }
   bool is_empty() const                 { return _bits == 0; }
   bool contains(uint var) const         { return (_bits & int_to_bit(var)) != 0; }
   bool is_singleton(uint var) const     { return (_bits == int_to_bit(var)); }
   bool contains_unknown() const         { return (_bits & UNKNOWN) != 0; }
   bool contains_allocated() const       { return (_bits & ALLOCATED) != 0; }
   bool contains_vars() const            { return (_bits & (((1 << MAXBIT) -1) << 2)) != 0; }
   void set(uint var)                    { _bits = int_to_bit(var); }
   void add(uint var)                    { _bits |= int_to_bit(var); }
   void add_unknown()                    { _bits = UNKNOWN; }
   void add_allocated()                  { _bits = ALLOCATED; }
   void set_union(const ArgumentMap &am)     { _bits |= am._bits; }
   void set_intersect(const ArgumentMap &am) { _bits |= am._bits; }
   void set_difference(const ArgumentMap &am) { _bits &=  ~am._bits; }
   void operator=(const ArgumentMap &am) { _bits = am._bits; }
   bool operator==(const ArgumentMap &am) { return _bits == am._bits; }
   bool operator!=(const ArgumentMap &am) { return _bits != am._bits; }
 };
 class BCEscapeAnalyzer::StateInfo {
 public:
   ArgumentMap *_vars;
   ArgumentMap *_stack;
   short _stack_height;
   short _max_stack;
   bool _initialized;
   ArgumentMap empty_map;
   StateInfo() {
     empty_map.clear();
   }
   ArgumentMap raw_pop()  { guarantee(_stack_height > 0, "stack underflow"); return _stack[--_stack_height]; }
   ArgumentMap  apop()    { return raw_pop(); }
   void spop()            { raw_pop(); }
   void lpop()            { spop(); spop(); }
   void raw_push(ArgumentMap i)   { guarantee(_stack_height < _max_stack, "stack overflow"); _stack[_stack_height++] = i; }
   void apush(ArgumentMap i)      { raw_push(i); }
   void spush()           { raw_push(empty_map); }
   void lpush()           { spush(); spush(); }
 };
 void BCEscapeAnalyzer::set_returned(ArgumentMap vars) {
   for (int i = 0; i < _arg_size; i++) {
     if (vars.contains(i))
       _arg_returned.set(i);
   }
   _return_local = _return_local && !(vars.contains_unknown() || vars.contains_allocated());
   _return_allocated = _return_allocated && vars.contains_allocated() && !(vars.contains_unknown() || vars.contains_vars());
 }
 // return true if any element of vars is an argument
 bool BCEscapeAnalyzer::is_argument(ArgumentMap vars) {
   for (int i = 0; i < _arg_size; i++) {
     if (vars.contains(i))
       return true;
   }
   return false;
 }
 // return true if any element of vars is an arg_stack argument
 bool BCEscapeAnalyzer::is_arg_stack(ArgumentMap vars){
   if (_conservative)
     return true;
   for (int i = 0; i < _arg_size; i++) {
     if (vars.contains(i) && _arg_stack.test(i))
       return true;
   }
   return false;
 }
 // return true if all argument elements of vars are returned
 bool BCEscapeAnalyzer::returns_all(ArgumentMap vars) {
   for (int i = 0; i < _arg_size; i++) {
     if (vars.contains(i) && !_arg_returned.test(i)) {
       return false;
     }
   }
   return true;
 }
 void BCEscapeAnalyzer::clear_bits(ArgumentMap vars, VectorSet &bm) {
   for (int i = 0; i < _arg_size; i++) {
     if (vars.contains(i)) {
       bm >>= i;
     }
   }
 }
 void BCEscapeAnalyzer::set_method_escape(ArgumentMap vars) {
   clear_bits(vars, _arg_local);
   if (vars.contains_allocated()) {
     _allocated_escapes = true;
   }
 }
 void BCEscapeAnalyzer::set_global_escape(ArgumentMap vars, bool merge) {
   clear_bits(vars, _arg_local);
   clear_bits(vars, _arg_stack);
   if (vars.contains_allocated())
     _allocated_escapes = true;
   if (merge && !vars.is_empty()) {
     // Merge new state into already processed block.
     // New state is not taken into account and
     // it may invalidate set_returned() result.
     if (vars.contains_unknown() || vars.contains_allocated()) {
       _return_local = false;
     }
     if (vars.contains_unknown() || vars.contains_vars()) {
       _return_allocated = false;
     }
     if (_return_local && vars.contains_vars() && !returns_all(vars)) {
       // Return result should be invalidated if args in new
       // state are not recorded in return state.
       _return_local = false;
     }
   }
 }
 void BCEscapeAnalyzer::set_dirty(ArgumentMap vars) {
   clear_bits(vars, _dirty);
 }
 void BCEscapeAnalyzer::set_modified(ArgumentMap vars, int offs, int size) {
   for (int i = 0; i < _arg_size; i++) {
     if (vars.contains(i)) {
       set_arg_modified(i, offs, size);
     }
   }
   if (vars.contains_unknown())
     _unknown_modified = true;
 }
 bool BCEscapeAnalyzer::is_recursive_call(ciMethod* callee) {
   for (BCEscapeAnalyzer* scope = this; scope != NULL; scope = scope->_parent) {
     if (scope->method() == callee) {
       return true;
     }
   }
   return false;
 }
 bool BCEscapeAnalyzer::is_arg_modified(int arg, int offset, int size_in_bytes) {
   if (offset == OFFSET_ANY)
     return _arg_modified[arg] != 0;
   assert(arg >= 0 && arg < _arg_size, "must be an argument.");
   bool modified = false;
   int l = offset / HeapWordSize;
   int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize;
   if (l > ARG_OFFSET_MAX)
     l = ARG_OFFSET_MAX;
   if (h > ARG_OFFSET_MAX+1)
     h = ARG_OFFSET_MAX + 1;
   for (int i = l; i < h; i++) {
     modified = modified || (_arg_modified[arg] & (1 << i)) != 0;
   }
   return modified;
 }
 void BCEscapeAnalyzer::set_arg_modified(int arg, int offset, int size_in_bytes) {
   if (offset == OFFSET_ANY) {
     _arg_modified[arg] =  (uint) -1;
     return;
   }
   assert(arg >= 0 && arg < _arg_size, "must be an argument.");
   int l = offset / HeapWordSize;
   int h = round_to(offset + size_in_bytes, HeapWordSize) / HeapWordSize;
   if (l > ARG_OFFSET_MAX)
     l = ARG_OFFSET_MAX;
   if (h > ARG_OFFSET_MAX+1)
     h = ARG_OFFSET_MAX + 1;
   for (int i = l; i < h; i++) {
     _arg_modified[arg] |= (1 << i);
   }
 }
 void BCEscapeAnalyzer::invoke(StateInfo &state, Bytecodes::Code code, ciMethod* target, ciKlass* holder) {
   int i;
   // retrieve information about the callee
   ciInstanceKlass* klass = target->holder();
   ciInstanceKlass* calling_klass = 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 or invokestatic.
   if (target->is_loaded() && !target->is_abstract() && target->can_be_statically_bound()) {
     switch (code) {
     case Bytecodes::_invokevirtual:
       code = Bytecodes::_invokespecial;
       break;
     case Bytecodes::_invokehandle:
       code = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokespecial;
       break;
     }
   }
   // compute size of arguments
   int arg_size = target->invoke_arg_size(code);
   int arg_base = MAX2(state._stack_height - arg_size, 0);
   // direct recursive calls are skipped if they can be bound statically without introducing
   // dependencies and if parameters are passed at the same position as in the current method
   // other calls are skipped if there are no unescaped arguments passed to them
   bool directly_recursive = (method() == target) &&
                (code != Bytecodes::_invokevirtual || target->is_final_method() || state._stack[arg_base] .is_empty());
   // check if analysis of callee can safely be skipped
   bool skip_callee = true;
   for (i = state._stack_height - 1; i >= arg_base && skip_callee; i--) {
     ArgumentMap arg = state._stack[i];
     skip_callee = !is_argument(arg) || !is_arg_stack(arg) || (directly_recursive && arg.is_singleton(i - arg_base));
   }
   // For now we conservatively skip invokedynamic.
   if (code == Bytecodes::_invokedynamic) {
     skip_callee = true;
   }
   if (skip_callee) {
     TRACE_BCEA(3, tty->print_cr("[EA] skipping method %s::%s", holder->name()->as_utf8(), target->name()->as_utf8()));
     for (i = 0; i < arg_size; i++) {
       set_method_escape(state.raw_pop());
     }
     _unknown_modified = true;  // assume the worst since we don't analyze the called method
     return;
   }
   // determine actual method (use CHA if necessary)
   ciMethod* inline_target = NULL;
   if (target->is_loaded() && klass->is_loaded()
       && (klass->is_initialized() || klass->is_interface() && target->holder()->is_initialized())
       && target->is_loaded()) {
     if (code == Bytecodes::_invokestatic
         || code == Bytecodes::_invokespecial
         || code == Bytecodes::_invokevirtual && target->is_final_method()) {
       inline_target = target;
     } else {
       inline_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv);
     }
   }
   if (inline_target != NULL && !is_recursive_call(inline_target)) {
     // analyze callee
     BCEscapeAnalyzer analyzer(inline_target, this);
     // adjust escape state of actual parameters
     bool must_record_dependencies = false;
     for (i = arg_size - 1; i >= 0; i--) {
       ArgumentMap arg = state.raw_pop();
       if (!is_argument(arg))
         continue;
       for (int j = 0; j < _arg_size; j++) {
         if (arg.contains(j)) {
           _arg_modified[j] |= analyzer._arg_modified[i];
         }
       }
       if (!is_arg_stack(arg)) {
         // arguments have already been recognized as escaping
       } else if (analyzer.is_arg_stack(i) && !analyzer.is_arg_returned(i)) {
         set_method_escape(arg);
         must_record_dependencies = true;
       } else {
         set_global_escape(arg);
       }
     }
     _unknown_modified = _unknown_modified || analyzer.has_non_arg_side_affects();
     // record dependencies if at least one parameter retained stack-allocatable
     if (must_record_dependencies) {
       if (code == Bytecodes::_invokeinterface || code == Bytecodes::_invokevirtual && !target->is_final_method()) {
         _dependencies.append(actual_recv);
         _dependencies.append(inline_target);
       }
       _dependencies.appendAll(analyzer.dependencies());
     }
   } else {
     TRACE_BCEA(1, tty->print_cr("[EA] virtual method %s is not monomorphic.",
                                 target->name()->as_utf8()));
     // conservatively mark all actual parameters as escaping globally
     for (i = 0; i < arg_size; i++) {
       ArgumentMap arg = state.raw_pop();
       if (!is_argument(arg))
         continue;
       set_modified(arg, OFFSET_ANY, type2size[T_INT]*HeapWordSize);
       set_global_escape(arg);
     }
     _unknown_modified = true;  // assume the worst since we don't know the called method
   }
 }
 bool BCEscapeAnalyzer::contains(uint arg_set1, uint arg_set2) {
   return ((~arg_set1) | arg_set2) == 0;
 }
 void BCEscapeAnalyzer::iterate_one_block(ciBlock *blk, StateInfo &state, GrowableArray<ciBlock *> &successors) {
   blk->set_processed();
   ciBytecodeStream s(method());
   int limit_bci = blk->limit_bci();
   bool fall_through = false;
   ArgumentMap allocated_obj;
   allocated_obj.add_allocated();
   ArgumentMap unknown_obj;
   unknown_obj.add_unknown();
   ArgumentMap empty_map;
   s.reset_to_bci(blk->start_bci());
   while (s.next() != ciBytecodeStream::EOBC() && s.cur_bci() < limit_bci) {
     fall_through = true;
     switch (s.cur_bc()) {
       case Bytecodes::_nop:
         break;
       case Bytecodes::_aconst_null:
         state.apush(unknown_obj);
         break;
       case Bytecodes::_iconst_m1:
       case Bytecodes::_iconst_0:
       case Bytecodes::_iconst_1:
       case Bytecodes::_iconst_2:
       case Bytecodes::_iconst_3:
       case Bytecodes::_iconst_4:
       case Bytecodes::_iconst_5:
       case Bytecodes::_fconst_0:
       case Bytecodes::_fconst_1:
       case Bytecodes::_fconst_2:
       case Bytecodes::_bipush:
       case Bytecodes::_sipush:
         state.spush();
         break;
       case Bytecodes::_lconst_0:
       case Bytecodes::_lconst_1:
       case Bytecodes::_dconst_0:
       case Bytecodes::_dconst_1:
         state.lpush();
         break;
       case Bytecodes::_ldc:
       case Bytecodes::_ldc_w:
       case Bytecodes::_ldc2_w:
       {
         // Avoid calling get_constant() which will try to allocate
         // unloaded constant. We need only constant's type.
         int index = s.get_constant_pool_index();
         constantTag tag = s.get_constant_pool_tag(index);
         if (tag.is_long() || tag.is_double()) {
           // Only longs and doubles use 2 stack slots.
           state.lpush();
         } else if (tag.basic_type() == T_OBJECT) {
           state.apush(unknown_obj);
         } else {
           state.spush();
         }
         break;
       }
       case Bytecodes::_aload:
         state.apush(state._vars[s.get_index()]);
         break;
       case Bytecodes::_iload:
       case Bytecodes::_fload:
       case Bytecodes::_iload_0:
       case Bytecodes::_iload_1:
       case Bytecodes::_iload_2:
       case Bytecodes::_iload_3:
       case Bytecodes::_fload_0:
       case Bytecodes::_fload_1:
       case Bytecodes::_fload_2:
       case Bytecodes::_fload_3:
         state.spush();
         break;
       case Bytecodes::_lload:
       case Bytecodes::_dload:
       case Bytecodes::_lload_0:
       case Bytecodes::_lload_1:
       case Bytecodes::_lload_2:
       case Bytecodes::_lload_3:
       case Bytecodes::_dload_0:
       case Bytecodes::_dload_1:
       case Bytecodes::_dload_2:
       case Bytecodes::_dload_3:
         state.lpush();
         break;
       case Bytecodes::_aload_0:
         state.apush(state._vars[0]);
         break;
       case Bytecodes::_aload_1:
         state.apush(state._vars[1]);
         break;
       case Bytecodes::_aload_2:
         state.apush(state._vars[2]);
         break;
       case Bytecodes::_aload_3:
         state.apush(state._vars[3]);
         break;
       case Bytecodes::_iaload:
       case Bytecodes::_faload:
       case Bytecodes::_baload:
       case Bytecodes::_caload:
       case Bytecodes::_saload:
         state.spop();
         set_method_escape(state.apop());
         state.spush();
         break;
       case Bytecodes::_laload:
       case Bytecodes::_daload:
         state.spop();
         set_method_escape(state.apop());
         state.lpush();
         break;
       case Bytecodes::_aaload:
         { state.spop();
           ArgumentMap array = state.apop();
           set_method_escape(array);
           state.apush(unknown_obj);
           set_dirty(array);
         }
         break;
       case Bytecodes::_istore:
       case Bytecodes::_fstore:
       case Bytecodes::_istore_0:
       case Bytecodes::_istore_1:
       case Bytecodes::_istore_2:
       case Bytecodes::_istore_3:
       case Bytecodes::_fstore_0:
       case Bytecodes::_fstore_1:
       case Bytecodes::_fstore_2:
       case Bytecodes::_fstore_3:
         state.spop();
         break;
       case Bytecodes::_lstore:
       case Bytecodes::_dstore:
       case Bytecodes::_lstore_0:
       case Bytecodes::_lstore_1:
       case Bytecodes::_lstore_2:
       case Bytecodes::_lstore_3:
       case Bytecodes::_dstore_0:
       case Bytecodes::_dstore_1:
       case Bytecodes::_dstore_2:
       case Bytecodes::_dstore_3:
         state.lpop();
         break;
       case Bytecodes::_astore:
         state._vars[s.get_index()] = state.apop();
         break;
       case Bytecodes::_astore_0:
         state._vars[0] = state.apop();
         break;
       case Bytecodes::_astore_1:
         state._vars[1] = state.apop();
         break;
       case Bytecodes::_astore_2:
         state._vars[2] = state.apop();
         break;
       case Bytecodes::_astore_3:
         state._vars[3] = state.apop();
         break;
       case Bytecodes::_iastore:
       case Bytecodes::_fastore:
       case Bytecodes::_bastore:
       case Bytecodes::_castore:
       case Bytecodes::_sastore:
       {
         state.spop();
         state.spop();
         ArgumentMap arr = state.apop();
         set_method_escape(arr);
         set_modified(arr, OFFSET_ANY, type2size[T_INT]*HeapWordSize);
         break;
       }
       case Bytecodes::_lastore:
       case Bytecodes::_dastore:
       {
         state.lpop();
         state.spop();
         ArgumentMap arr = state.apop();
         set_method_escape(arr);
         set_modified(arr, OFFSET_ANY, type2size[T_LONG]*HeapWordSize);
         break;
       }
       case Bytecodes::_aastore:
       {
         set_global_escape(state.apop());
         state.spop();
         ArgumentMap arr = state.apop();
         set_modified(arr, OFFSET_ANY, type2size[T_OBJECT]*HeapWordSize);
         break;
       }
       case Bytecodes::_pop:
         state.raw_pop();
         break;
       case Bytecodes::_pop2:
         state.raw_pop();
         state.raw_pop();
         break;
       case Bytecodes::_dup:
         { ArgumentMap w1 = state.raw_pop();
           state.raw_push(w1);
           state.raw_push(w1);
         }
         break;
       case Bytecodes::_dup_x1:
         { ArgumentMap w1 = state.raw_pop();
           ArgumentMap w2 = state.raw_pop();
           state.raw_push(w1);
           state.raw_push(w2);
           state.raw_push(w1);
         }
         break;
       case Bytecodes::_dup_x2:
         { ArgumentMap w1 = state.raw_pop();
           ArgumentMap w2 = state.raw_pop();
           ArgumentMap w3 = state.raw_pop();
           state.raw_push(w1);
           state.raw_push(w3);
           state.raw_push(w2);
           state.raw_push(w1);
         }
         break;
       case Bytecodes::_dup2:
         { ArgumentMap w1 = state.raw_pop();
           ArgumentMap 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:
         { ArgumentMap w1 = state.raw_pop();
           ArgumentMap w2 = state.raw_pop();
           ArgumentMap 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:
         { ArgumentMap w1 = state.raw_pop();
           ArgumentMap w2 = state.raw_pop();
           ArgumentMap w3 = state.raw_pop();
           ArgumentMap 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:
         { ArgumentMap w1 = state.raw_pop();
           ArgumentMap w2 = state.raw_pop();
           state.raw_push(w1);
           state.raw_push(w2);
         }
         break;
       case Bytecodes::_iadd:
       case Bytecodes::_fadd:
       case Bytecodes::_isub:
       case Bytecodes::_fsub:
       case Bytecodes::_imul:
       case Bytecodes::_fmul:
       case Bytecodes::_idiv:
       case Bytecodes::_fdiv:
       case Bytecodes::_irem:
       case Bytecodes::_frem:
       case Bytecodes::_iand:
       case Bytecodes::_ior:
       case Bytecodes::_ixor:
         state.spop();
         state.spop();
         state.spush();
         break;
       case Bytecodes::_ladd:
       case Bytecodes::_dadd:
       case Bytecodes::_lsub:
       case Bytecodes::_dsub:
       case Bytecodes::_lmul:
       case Bytecodes::_dmul:
       case Bytecodes::_ldiv:
       case Bytecodes::_ddiv:
       case Bytecodes::_lrem:
       case Bytecodes::_drem:
       case Bytecodes::_land:
       case Bytecodes::_lor:
       case Bytecodes::_lxor:
         state.lpop();
         state.lpop();
         state.lpush();
         break;
       case Bytecodes::_ishl:
       case Bytecodes::_ishr:
       case Bytecodes::_iushr:
         state.spop();
         state.spop();
         state.spush();
         break;
       case Bytecodes::_lshl:
       case Bytecodes::_lshr:
       case Bytecodes::_lushr:
         state.spop();
         state.lpop();
         state.lpush();
         break;
       case Bytecodes::_ineg:
       case Bytecodes::_fneg:
         state.spop();
         state.spush();
         break;
       case Bytecodes::_lneg:
       case Bytecodes::_dneg:
         state.lpop();
         state.lpush();
         break;
       case Bytecodes::_iinc:
         break;
       case Bytecodes::_i2l:
       case Bytecodes::_i2d:
       case Bytecodes::_f2l:
       case Bytecodes::_f2d:
         state.spop();
         state.lpush();
         break;
       case Bytecodes::_i2f:
       case Bytecodes::_f2i:
         state.spop();
         state.spush();
         break;
       case Bytecodes::_l2i:
       case Bytecodes::_l2f:
       case Bytecodes::_d2i:
       case Bytecodes::_d2f:
         state.lpop();
         state.spush();
         break;
       case Bytecodes::_l2d:
       case Bytecodes::_d2l:
         state.lpop();
         state.lpush();
         break;
       case Bytecodes::_i2b:
       case Bytecodes::_i2c:
       case Bytecodes::_i2s:
         state.spop();
         state.spush();
         break;
       case Bytecodes::_lcmp:
       case Bytecodes::_dcmpl:
       case Bytecodes::_dcmpg:
         state.lpop();
         state.lpop();
         state.spush();
         break;
       case Bytecodes::_fcmpl:
       case Bytecodes::_fcmpg:
         state.spop();
         state.spop();
         state.spush();
         break;
       case Bytecodes::_ifeq:
       case Bytecodes::_ifne:
       case Bytecodes::_iflt:
       case Bytecodes::_ifge:
       case Bytecodes::_ifgt:
       case Bytecodes::_ifle:
       {
         state.spop();
         int dest_bci = s.get_dest();
         assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
         assert(s.next_bci() == limit_bci, "branch must end block");
         successors.push(_methodBlocks->block_containing(dest_bci));
         break;
       }
       case Bytecodes::_if_icmpeq:
       case Bytecodes::_if_icmpne:
       case Bytecodes::_if_icmplt:
       case Bytecodes::_if_icmpge:
       case Bytecodes::_if_icmpgt:
       case Bytecodes::_if_icmple:
       {
         state.spop();
         state.spop();
         int dest_bci = s.get_dest();
         assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
         assert(s.next_bci() == limit_bci, "branch must end block");
         successors.push(_methodBlocks->block_containing(dest_bci));
         break;
       }
       case Bytecodes::_if_acmpeq:
       case Bytecodes::_if_acmpne:
       {
         set_method_escape(state.apop());
         set_method_escape(state.apop());
         int dest_bci = s.get_dest();
         assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
         assert(s.next_bci() == limit_bci, "branch must end block");
         successors.push(_methodBlocks->block_containing(dest_bci));
         break;
       }
       case Bytecodes::_goto:
       {
         int dest_bci = s.get_dest();
         assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
         assert(s.next_bci() == limit_bci, "branch must end block");
         successors.push(_methodBlocks->block_containing(dest_bci));
         fall_through = false;
         break;
       }
       case Bytecodes::_jsr:
       {
         int dest_bci = s.get_dest();
         assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
         assert(s.next_bci() == limit_bci, "branch must end block");
         state.apush(empty_map);
         successors.push(_methodBlocks->block_containing(dest_bci));
         fall_through = false;
         break;
       }
       case Bytecodes::_ret:
         // we don't track  the destination of a "ret" instruction
         assert(s.next_bci() == limit_bci, "branch must end block");
         fall_through = false;
         break;
       case Bytecodes::_return:
         assert(s.next_bci() == limit_bci, "return must end block");
         fall_through = false;
         break;
       case Bytecodes::_tableswitch:
         {
           state.spop();
           Bytecode_tableswitch sw(&s);
           int len = sw.length();
           int dest_bci;
           for (int i = 0; i < len; i++) {
             dest_bci = s.cur_bci() + sw.dest_offset_at(i);
             assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
             successors.push(_methodBlocks->block_containing(dest_bci));
           }
           dest_bci = s.cur_bci() + sw.default_offset();
           assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
           successors.push(_methodBlocks->block_containing(dest_bci));
           assert(s.next_bci() == limit_bci, "branch must end block");
           fall_through = false;
           break;
         }
       case Bytecodes::_lookupswitch:
         {
           state.spop();
           Bytecode_lookupswitch sw(&s);
           int len = sw.number_of_pairs();
           int dest_bci;
           for (int i = 0; i < len; i++) {
             dest_bci = s.cur_bci() + sw.pair_at(i).offset();
             assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
             successors.push(_methodBlocks->block_containing(dest_bci));
           }
           dest_bci = s.cur_bci() + sw.default_offset();
           assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
           successors.push(_methodBlocks->block_containing(dest_bci));
           fall_through = false;
           break;
         }
       case Bytecodes::_ireturn:
       case Bytecodes::_freturn:
         state.spop();
         fall_through = false;
         break;
       case Bytecodes::_lreturn:
       case Bytecodes::_dreturn:
         state.lpop();
         fall_through = false;
         break;
       case Bytecodes::_areturn:
         set_returned(state.apop());
         fall_through = false;
         break;
       case Bytecodes::_getstatic:
       case Bytecodes::_getfield:
         { bool ignored_will_link;
           ciField* field = s.get_field(ignored_will_link);
           BasicType field_type = field->type()->basic_type();
           if (s.cur_bc() != Bytecodes::_getstatic) {
             set_method_escape(state.apop());
           }
           if (field_type == T_OBJECT || field_type == T_ARRAY) {
             state.apush(unknown_obj);
           } else if (type2size[field_type] == 1) {
             state.spush();
           } else {
             state.lpush();
           }
         }
         break;
       case Bytecodes::_putstatic:
       case Bytecodes::_putfield:
         { bool will_link;
           ciField* field = s.get_field(will_link);
           BasicType field_type = field->type()->basic_type();
           if (field_type == T_OBJECT || field_type == T_ARRAY) {
             set_global_escape(state.apop());
           } else if (type2size[field_type] == 1) {
             state.spop();
           } else {
             state.lpop();
           }
           if (s.cur_bc() != Bytecodes::_putstatic) {
             ArgumentMap p = state.apop();
             set_method_escape(p);
             set_modified(p, will_link ? field->offset() : OFFSET_ANY, type2size[field_type]*HeapWordSize);
           }
         }
         break;
       case Bytecodes::_invokevirtual:
       case Bytecodes::_invokespecial:
       case Bytecodes::_invokestatic:
       case Bytecodes::_invokedynamic:
       case Bytecodes::_invokeinterface:
         { bool ignored_will_link;
           ciSignature* declared_signature = NULL;
           ciMethod* target = s.get_method(ignored_will_link, &declared_signature);
           ciKlass*  holder = s.get_declared_method_holder();
           assert(declared_signature != NULL, "cannot be null");
           // Push appendix argument, if one.
           if (s.has_appendix()) {
             state.apush(unknown_obj);
           }
           // Pass in raw bytecode because we need to see invokehandle instructions.
           invoke(state, s.cur_bc_raw(), target, holder);
           // We are using the return type of the declared signature here because
           // it might be a more concrete type than the one from the target (for
           // e.g. invokedynamic and invokehandle).
           ciType* return_type = declared_signature->return_type();
           if (!return_type->is_primitive_type()) {
             state.apush(unknown_obj);
           } else if (return_type->is_one_word()) {
             state.spush();
           } else if (return_type->is_two_word()) {
             state.lpush();
           }
         }
         break;
       case Bytecodes::_new:
         state.apush(allocated_obj);
         break;
       case Bytecodes::_newarray:
       case Bytecodes::_anewarray:
         state.spop();
         state.apush(allocated_obj);
         break;
       case Bytecodes::_multianewarray:
         { int i = s.cur_bcp()[3];
           while (i-- > 0) state.spop();
           state.apush(allocated_obj);
         }
         break;
       case Bytecodes::_arraylength:
         set_method_escape(state.apop());
         state.spush();
         break;
       case Bytecodes::_athrow:
         set_global_escape(state.apop());
         fall_through = false;
         break;
       case Bytecodes::_checkcast:
         { ArgumentMap obj = state.apop();
           set_method_escape(obj);
           state.apush(obj);
         }
         break;
       case Bytecodes::_instanceof:
         set_method_escape(state.apop());
         state.spush();
         break;
       case Bytecodes::_monitorenter:
       case Bytecodes::_monitorexit:
         state.apop();
         break;
       case Bytecodes::_wide:
         ShouldNotReachHere();
         break;
       case Bytecodes::_ifnull:
       case Bytecodes::_ifnonnull:
       {
         set_method_escape(state.apop());
         int dest_bci = s.get_dest();
         assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
         assert(s.next_bci() == limit_bci, "branch must end block");
         successors.push(_methodBlocks->block_containing(dest_bci));
         break;
       }
       case Bytecodes::_goto_w:
       {
         int dest_bci = s.get_far_dest();
         assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
         assert(s.next_bci() == limit_bci, "branch must end block");
         successors.push(_methodBlocks->block_containing(dest_bci));
         fall_through = false;
         break;
       }
       case Bytecodes::_jsr_w:
       {
         int dest_bci = s.get_far_dest();
         assert(_methodBlocks->is_block_start(dest_bci), "branch destination must start a block");
         assert(s.next_bci() == limit_bci, "branch must end block");
         state.apush(empty_map);
         successors.push(_methodBlocks->block_containing(dest_bci));
         fall_through = false;
         break;
       }
       case Bytecodes::_breakpoint:
         break;
       default:
         ShouldNotReachHere();
         break;
     }
   }
   if (fall_through) {
     int fall_through_bci = s.cur_bci();
     if (fall_through_bci < _method->code_size()) {
       assert(_methodBlocks->is_block_start(fall_through_bci), "must fall through to block start.");
       successors.push(_methodBlocks->block_containing(fall_through_bci));
     }
   }
 }
 void BCEscapeAnalyzer::merge_block_states(StateInfo *blockstates, ciBlock *dest, StateInfo *s_state) {
   StateInfo *d_state = blockstates + dest->index();
   int nlocals = _method->max_locals();
   // exceptions may cause transfer of control to handlers in the middle of a
   // block, so we don't merge the incoming state of exception handlers
   if (dest->is_handler())
     return;
   if (!d_state->_initialized ) {
     // destination not initialized, just copy
     for (int i = 0; i < nlocals; i++) {
       d_state->_vars[i] = s_state->_vars[i];
     }
     for (int i = 0; i < s_state->_stack_height; i++) {
       d_state->_stack[i] = s_state->_stack[i];
     }
     d_state->_stack_height = s_state->_stack_height;
     d_state->_max_stack = s_state->_max_stack;
     d_state->_initialized = true;
   } else if (!dest->processed()) {
     // we have not yet walked the bytecodes of dest, we can merge
     // the states
     assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match");
     for (int i = 0; i < nlocals; i++) {
       d_state->_vars[i].set_union(s_state->_vars[i]);
     }
     for (int i = 0; i < s_state->_stack_height; i++) {
       d_state->_stack[i].set_union(s_state->_stack[i]);
     }
   } else {
     // the bytecodes of dest have already been processed, mark any
     // arguments in the source state which are not in the dest state
     // as global escape.
     // Future refinement:  we only need to mark these variable to the
     // maximum escape of any variables in dest state
     assert(d_state->_stack_height == s_state->_stack_height, "computed stack heights must match");
     ArgumentMap extra_vars;
     for (int i = 0; i < nlocals; i++) {
       ArgumentMap t;
       t = s_state->_vars[i];
       t.set_difference(d_state->_vars[i]);
       extra_vars.set_union(t);
     }
     for (int i = 0; i < s_state->_stack_height; i++) {
       ArgumentMap t;
       //extra_vars |= !d_state->_vars[i] & s_state->_vars[i];
       t.clear();
       t = s_state->_stack[i];
       t.set_difference(d_state->_stack[i]);
       extra_vars.set_union(t);
     }
     set_global_escape(extra_vars, true);
   }
 }
 void BCEscapeAnalyzer::iterate_blocks(Arena *arena) {
   int numblocks = _methodBlocks->num_blocks();
   int stkSize   = _method->max_stack();
   int numLocals = _method->max_locals();
   StateInfo state;
   int datacount = (numblocks + 1) * (stkSize + numLocals);
   int datasize = datacount * sizeof(ArgumentMap);
   StateInfo *blockstates = (StateInfo *) arena->Amalloc(numblocks * sizeof(StateInfo));
   ArgumentMap *statedata  = (ArgumentMap *) arena->Amalloc(datasize);
   for (int i = 0; i < datacount; i++) ::new ((void*)&statedata[i]) ArgumentMap();
   ArgumentMap *dp = statedata;
   state._vars = dp;
   dp += numLocals;
   state._stack = dp;
   dp += stkSize;
   state._initialized = false;
   state._max_stack = stkSize;
   for (int i = 0; i < numblocks; i++) {
     blockstates[i]._vars = dp;
     dp += numLocals;
     blockstates[i]._stack = dp;
     dp += stkSize;
     blockstates[i]._initialized = false;
     blockstates[i]._stack_height = 0;
     blockstates[i]._max_stack  = stkSize;
   }
   GrowableArray<ciBlock *> worklist(arena, numblocks / 4, 0, NULL);
   GrowableArray<ciBlock *> successors(arena, 4, 0, NULL);
   _methodBlocks->clear_processed();
   // initialize block 0 state from method signature
   ArgumentMap allVars;   // all oop arguments to method
   ciSignature* sig = method()->signature();
   int j = 0;
   ciBlock* first_blk = _methodBlocks->block_containing(0);
   int fb_i = first_blk->index();
   if (!method()->is_static()) {
     // record information for "this"
     blockstates[fb_i]._vars[j].set(j);
     allVars.add(j);
     j++;
   }
   for (int i = 0; i < sig->count(); i++) {
     ciType* t = sig->type_at(i);
     if (!t->is_primitive_type()) {
       blockstates[fb_i]._vars[j].set(j);
       allVars.add(j);
     }
     j += t->size();
   }
   blockstates[fb_i]._initialized = true;
   assert(j == _arg_size, "just checking");
   ArgumentMap unknown_map;
   unknown_map.add_unknown();
   worklist.push(first_blk);
   while(worklist.length() > 0) {
     ciBlock *blk = worklist.pop();
     StateInfo *blkState = blockstates + blk->index();
     if (blk->is_handler() || blk->is_ret_target()) {
       // for an exception handler or a target of a ret instruction, we assume the worst case,
       // that any variable could contain any argument
       for (int i = 0; i < numLocals; i++) {
         state._vars[i] = allVars;
       }
       if (blk->is_handler()) {
         state._stack_height = 1;
       } else {
         state._stack_height = blkState->_stack_height;
       }
       for (int i = 0; i < state._stack_height; i++) {
 // ??? should this be unknown_map ???
         state._stack[i] = allVars;
       }
     } else {
       for (int i = 0; i < numLocals; i++) {
         state._vars[i] = blkState->_vars[i];
       }
       for (int i = 0; i < blkState->_stack_height; i++) {
         state._stack[i] = blkState->_stack[i];
       }
       state._stack_height = blkState->_stack_height;
     }
     iterate_one_block(blk, state, successors);
     // if this block has any exception handlers, push them
     // onto successor list
     if (blk->has_handler()) {
       DEBUG_ONLY(int handler_count = 0;)
       int blk_start = blk->start_bci();
       int blk_end = blk->limit_bci();
       for (int i = 0; i < numblocks; i++) {
         ciBlock *b = _methodBlocks->block(i);
         if (b->is_handler()) {
           int ex_start = b->ex_start_bci();
           int ex_end = b->ex_limit_bci();
           if ((ex_start >= blk_start && ex_start < blk_end) ||
               (ex_end > blk_start && ex_end <= blk_end)) {
             successors.push(b);
           }
           DEBUG_ONLY(handler_count++;)
         }
       }
       assert(handler_count > 0, "must find at least one handler");
     }
     // merge computed variable state with successors
     while(successors.length() > 0) {
       ciBlock *succ = successors.pop();
       merge_block_states(blockstates, succ, &state);
       if (!succ->processed())
         worklist.push(succ);
     }
   }
 }
 bool BCEscapeAnalyzer::do_analysis() {
   Arena* arena = CURRENT_ENV->arena();
   // identify basic blocks
   _methodBlocks = _method->get_method_blocks();
   iterate_blocks(arena);
   // TEMPORARY
   return true;
 }
 vmIntrinsics::ID BCEscapeAnalyzer::known_intrinsic() {
   vmIntrinsics::ID iid = method()->intrinsic_id();
   if (iid == vmIntrinsics::_getClass ||
       iid ==  vmIntrinsics::_fillInStackTrace ||
       iid == vmIntrinsics::_hashCode)
     return iid;
   else
     return vmIntrinsics::_none;
 }
 bool BCEscapeAnalyzer::compute_escape_for_intrinsic(vmIntrinsics::ID iid) {
   ArgumentMap arg;
   arg.clear();
   switch (iid) {
   case vmIntrinsics::_getClass:
     _return_local = false;
     break;
   case vmIntrinsics::_fillInStackTrace:
     arg.set(0); // 'this'
     set_returned(arg);
     break;
   case vmIntrinsics::_hashCode:
     // initialized state is correct
     break;
   default:
     assert(false, "unexpected intrinsic");
   }
   return true;
 }
 void BCEscapeAnalyzer::initialize() {
   int i;
   // clear escape information (method may have been deoptimized)
   methodData()->clear_escape_info();
   // initialize escape state of object parameters
   ciSignature* sig = method()->signature();
   int j = 0;
   if (!method()->is_static()) {
     _arg_local.set(0);
     _arg_stack.set(0);
     j++;
   }
   for (i = 0; i < sig->count(); i++) {
     ciType* t = sig->type_at(i);
     if (!t->is_primitive_type()) {
       _arg_local.set(j);
       _arg_stack.set(j);
     }
     j += t->size();
   }
   assert(j == _arg_size, "just checking");
   // start with optimistic assumption
   ciType *rt = _method->return_type();
   if (rt->is_primitive_type()) {
     _return_local = false;
     _return_allocated = false;
   } else {
     _return_local = true;
     _return_allocated = true;
   }
   _allocated_escapes = false;
   _unknown_modified = false;
 }
 void BCEscapeAnalyzer::clear_escape_info() {
   ciSignature* sig = method()->signature();
   int arg_count = sig->count();
   ArgumentMap var;
   if (!method()->is_static()) {
     arg_count++;  // allow for "this"
   }
   for (int i = 0; i < arg_count; i++) {
     set_arg_modified(i, OFFSET_ANY, 4);
     var.clear();
     var.set(i);
     set_modified(var, OFFSET_ANY, 4);
     set_global_escape(var);
   }
   _arg_local.Clear();
   _arg_stack.Clear();
   _arg_returned.Clear();
   _return_local = false;
   _return_allocated = false;
   _allocated_escapes = true;
   _unknown_modified = true;
 }
 void BCEscapeAnalyzer::compute_escape_info() {
   int i;
   assert(!methodData()->has_escape_info(), "do not overwrite escape info");
   vmIntrinsics::ID iid = known_intrinsic();
   // check if method can be analyzed
   if (iid ==  vmIntrinsics::_none && (method()->is_abstract() || method()->is_native() || !method()->holder()->is_initialized()
       || _level > MaxBCEAEstimateLevel
       || method()->code_size() > MaxBCEAEstimateSize)) {
     if (BCEATraceLevel >= 1) {
       tty->print("Skipping method because: ");
       if (method()->is_abstract())
         tty->print_cr("method is abstract.");
       else if (method()->is_native())
         tty->print_cr("method is native.");
       else if (!method()->holder()->is_initialized())
         tty->print_cr("class of method is not initialized.");
       else if (_level > MaxBCEAEstimateLevel)
         tty->print_cr("level (%d) exceeds MaxBCEAEstimateLevel (%d).",
                       _level, (int) MaxBCEAEstimateLevel);
       else if (method()->code_size() > MaxBCEAEstimateSize)
         tty->print_cr("code size (%d) exceeds MaxBCEAEstimateSize (%d).",
                       method()->code_size(), (int) MaxBCEAEstimateSize);
       else
         ShouldNotReachHere();
     }
     clear_escape_info();
     return;
   }
   if (BCEATraceLevel >= 1) {
     tty->print("[EA] estimating escape information for");
     if (iid != vmIntrinsics::_none)
       tty->print(" intrinsic");
     method()->print_short_name();
     tty->print_cr(" (%d bytes)", method()->code_size());
   }
   bool success;
   initialize();
   // Do not scan method if it has no object parameters and
   // does not returns an object (_return_allocated is set in initialize()).
   if (_arg_local.Size() == 0 && !_return_allocated) {
     // Clear all info since method's bytecode was not analysed and
     // set pessimistic escape information.
     clear_escape_info();
     methodData()->set_eflag(MethodData::allocated_escapes);
     methodData()->set_eflag(MethodData::unknown_modified);
     methodData()->set_eflag(MethodData::estimated);
     return;
   }
   if (iid != vmIntrinsics::_none)
     success = compute_escape_for_intrinsic(iid);
   else {
     success = do_analysis();
   }
   // don't store interprocedural escape information if it introduces
   // dependencies or if method data is empty
   //
   if (!has_dependencies() && !methodData()->is_empty()) {
     for (i = 0; i < _arg_size; i++) {
       if (_arg_local.test(i)) {
         assert(_arg_stack.test(i), "inconsistent escape info");
         methodData()->set_arg_local(i);
         methodData()->set_arg_stack(i);
       } else if (_arg_stack.test(i)) {
         methodData()->set_arg_stack(i);
       }
       if (_arg_returned.test(i)) {
         methodData()->set_arg_returned(i);
       }
       methodData()->set_arg_modified(i, _arg_modified[i]);
     }
     if (_return_local) {
       methodData()->set_eflag(MethodData::return_local);
     }
     if (_return_allocated) {
       methodData()->set_eflag(MethodData::return_allocated);
     }
     if (_allocated_escapes) {
       methodData()->set_eflag(MethodData::allocated_escapes);
     }
     if (_unknown_modified) {
       methodData()->set_eflag(MethodData::unknown_modified);
     }
     methodData()->set_eflag(MethodData::estimated);
   }
 }
 void BCEscapeAnalyzer::read_escape_info() {
   assert(methodData()->has_escape_info(), "no escape info available");
   // read escape information from method descriptor
   for (int i = 0; i < _arg_size; i++) {
     if (methodData()->is_arg_local(i))
       _arg_local.set(i);
     if (methodData()->is_arg_stack(i))
       _arg_stack.set(i);
     if (methodData()->is_arg_returned(i))
       _arg_returned.set(i);
     _arg_modified[i] = methodData()->arg_modified(i);
   }
   _return_local = methodData()->eflag_set(MethodData::return_local);
   _return_allocated = methodData()->eflag_set(MethodData::return_allocated);
   _allocated_escapes = methodData()->eflag_set(MethodData::allocated_escapes);
   _unknown_modified = methodData()->eflag_set(MethodData::unknown_modified);
 }
 #ifndef PRODUCT
 void BCEscapeAnalyzer::dump() {
   tty->print("[EA] estimated escape information for");
   method()->print_short_name();
   tty->print_cr(has_dependencies() ? " (not stored)" : "");
   tty->print("     non-escaping args:      ");
   _arg_local.print_on(tty);
   tty->print("     stack-allocatable args: ");
   _arg_stack.print_on(tty);
   if (_return_local) {
     tty->print("     returned args:          ");
     _arg_returned.print_on(tty);
   } else if (is_return_allocated()) {
     tty->print_cr("     return allocated value");
   } else {
     tty->print_cr("     return non-local value");
   }
   tty->print("     modified args: ");
   for (int i = 0; i < _arg_size; i++) {
     if (_arg_modified[i] == 0)
       tty->print("    0");
     else
       tty->print("    0x%x", _arg_modified[i]);
   }
   tty->cr();
   tty->print("     flags: ");
   if (_return_allocated)
     tty->print(" return_allocated");
   if (_allocated_escapes)
     tty->print(" allocated_escapes");
   if (_unknown_modified)
     tty->print(" unknown_modified");
   tty->cr();
 }
 #endif
 BCEscapeAnalyzer::BCEscapeAnalyzer(ciMethod* method, BCEscapeAnalyzer* parent)
     : _conservative(method == NULL || !EstimateArgEscape)
     , _arena(CURRENT_ENV->arena())
     , _method(method)
     , _methodData(method ? method->method_data() : NULL)
     , _arg_size(method ? method->arg_size() : 0)
     , _arg_local(_arena)
     , _arg_stack(_arena)
     , _arg_returned(_arena)
     , _dirty(_arena)
     , _return_local(false)
     , _return_allocated(false)
     , _allocated_escapes(false)
     , _unknown_modified(false)
     , _dependencies(_arena, 4, 0, NULL)
     , _parent(parent)
     , _level(parent == NULL ? 0 : parent->level() + 1) {
   if (!_conservative) {
     _arg_local.Clear();
     _arg_stack.Clear();
     _arg_returned.Clear();
     _dirty.Clear();
     Arena* arena = CURRENT_ENV->arena();
     _arg_modified = (uint *) arena->Amalloc(_arg_size * sizeof(uint));
     Copy::zero_to_bytes(_arg_modified, _arg_size * sizeof(uint));
     if (methodData() == NULL)
       return;
     bool printit = _method->should_print_assembly();
     if (methodData()->has_escape_info()) {
       TRACE_BCEA(2, tty->print_cr("[EA] Reading previous results for %s.%s",
                                   method->holder()->name()->as_utf8(),
                                   method->name()->as_utf8()));
       read_escape_info();
     } else {
       TRACE_BCEA(2, tty->print_cr("[EA] computing results for %s.%s",
                                   method->holder()->name()->as_utf8(),
                                   method->name()->as_utf8()));
       compute_escape_info();
       methodData()->update_escape_info();
     }
 #ifndef PRODUCT
     if (BCEATraceLevel >= 3) {
       // dump escape information
       dump();
     }
 #endif
   }
 }
 void BCEscapeAnalyzer::copy_dependencies(Dependencies *deps) {
   if (ciEnv::current()->jvmti_can_hotswap_or_post_breakpoint()) {
     // Also record evol dependencies so redefinition of the
     // callee will trigger recompilation.
     deps->assert_evol_method(method());
   }
   for (int i = 0; i < _dependencies.length(); i+=2) {
     ciKlass *k = _dependencies.at(i)->as_klass();
     ciMethod *m = _dependencies.at(i+1)->as_method();
     deps->assert_unique_concrete_method(k, m);
   }
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/ci/bcEscapeAnalyzer.cpp@42d9a5f06728 (annotated)

src/share/vm/ci/bcEscapeAnalyzer.cpp