jdk8-mips64-public/hotspot: src/share/vm/opto/parseHelper.cpp@c1c199dde5c9 (annotated)

src/share/vm/opto/parseHelper.cpp@c1c199dde5c9 (annotated)

src/share/vm/opto/parseHelper.cpp

Wed, 03 Jun 2015 14:22:57 +0200

author: roland
date: Wed, 03 Jun 2015 14:22:57 +0200
changeset 7859: c1c199dde5c9
parent 7341: e7b3d177adda
child 7535: 7ae4e26cb1e0
permissions: -rw-r--r--

8077504: Unsafe load can loose control dependency and cause crash
Summary: Node::depends_only_on_test() should return false for Unsafe loads
Reviewed-by: kvn, adinn

 /*
  * Copyright (c) 1998, 2013, 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 "classfile/systemDictionary.hpp"
 #include "compiler/compileLog.hpp"
 #include "oops/objArrayKlass.hpp"
 #include "opto/addnode.hpp"
 #include "opto/memnode.hpp"
 #include "opto/mulnode.hpp"
 #include "opto/parse.hpp"
 #include "opto/rootnode.hpp"
 #include "opto/runtime.hpp"
 #include "runtime/sharedRuntime.hpp"
 //------------------------------make_dtrace_method_entry_exit ----------------
 // Dtrace -- record entry or exit of a method if compiled with dtrace support
 void GraphKit::make_dtrace_method_entry_exit(ciMethod* method, bool is_entry) {
   const TypeFunc *call_type    = OptoRuntime::dtrace_method_entry_exit_Type();
   address         call_address = is_entry ? CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry) :
                                             CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit);
   const char     *call_name    = is_entry ? "dtrace_method_entry" : "dtrace_method_exit";
   // Get base of thread-local storage area
   Node* thread = _gvn.transform( new (C) ThreadLocalNode() );
   // Get method
   const TypePtr* method_type = TypeMetadataPtr::make(method);
   Node *method_node = _gvn.transform( ConNode::make(C, method_type) );
   kill_dead_locals();
   // For some reason, this call reads only raw memory.
   const TypePtr* raw_adr_type = TypeRawPtr::BOTTOM;
   make_runtime_call(RC_LEAF | RC_NARROW_MEM,
                     call_type, call_address,
                     call_name, raw_adr_type,
                     thread, method_node);
 }
 //=============================================================================
 //------------------------------do_checkcast-----------------------------------
 void Parse::do_checkcast() {
   bool will_link;
   ciKlass* klass = iter().get_klass(will_link);
   Node *obj = peek();
   // Throw uncommon trap if class is not loaded or the value we are casting
   // _from_ is not loaded, and value is not null.  If the value _is_ NULL,
   // then the checkcast does nothing.
   const TypeOopPtr *tp = _gvn.type(obj)->isa_oopptr();
   if (!will_link || (tp && tp->klass() && !tp->klass()->is_loaded())) {
     if (C->log() != NULL) {
       if (!will_link) {
         C->log()->elem("assert_null reason='checkcast' klass='%d'",
                        C->log()->identify(klass));
       }
       if (tp && tp->klass() && !tp->klass()->is_loaded()) {
         // %%% Cannot happen?
         C->log()->elem("assert_null reason='checkcast source' klass='%d'",
                        C->log()->identify(tp->klass()));
       }
     }
     null_assert(obj);
     assert( stopped() || _gvn.type(peek())->higher_equal(TypePtr::NULL_PTR), "what's left behind is null" );
     if (!stopped()) {
       profile_null_checkcast();
     }
     return;
   }
   Node *res = gen_checkcast(obj, makecon(TypeKlassPtr::make(klass)) );
   // Pop from stack AFTER gen_checkcast because it can uncommon trap and
   // the debug info has to be correct.
   pop();
   push(res);
 }
 //------------------------------do_instanceof----------------------------------
 void Parse::do_instanceof() {
   if (stopped())  return;
   // We would like to return false if class is not loaded, emitting a
   // dependency, but Java requires instanceof to load its operand.
   // Throw uncommon trap if class is not loaded
   bool will_link;
   ciKlass* klass = iter().get_klass(will_link);
   if (!will_link) {
     if (C->log() != NULL) {
       C->log()->elem("assert_null reason='instanceof' klass='%d'",
                      C->log()->identify(klass));
     }
     null_assert(peek());
     assert( stopped() || _gvn.type(peek())->higher_equal(TypePtr::NULL_PTR), "what's left behind is null" );
     if (!stopped()) {
       // The object is now known to be null.
       // Shortcut the effect of gen_instanceof and return "false" directly.
       pop();                   // pop the null
       push(_gvn.intcon(0));    // push false answer
     }
     return;
   }
   // Push the bool result back on stack
   Node* res = gen_instanceof(peek(), makecon(TypeKlassPtr::make(klass)), true);
   // Pop from stack AFTER gen_instanceof because it can uncommon trap.
   pop();
   push(res);
 }
 //------------------------------array_store_check------------------------------
 // pull array from stack and check that the store is valid
 void Parse::array_store_check() {
   // Shorthand access to array store elements without popping them.
   Node *obj = peek(0);
   Node *idx = peek(1);
   Node *ary = peek(2);
   if (_gvn.type(obj) == TypePtr::NULL_PTR) {
     // There's never a type check on null values.
     // This cutout lets us avoid the uncommon_trap(Reason_array_check)
     // below, which turns into a performance liability if the
     // gen_checkcast folds up completely.
     return;
   }
   // Extract the array klass type
   int klass_offset = oopDesc::klass_offset_in_bytes();
   Node* p = basic_plus_adr( ary, ary, klass_offset );
   // p's type is array-of-OOPS plus klass_offset
   Node* array_klass = _gvn.transform(LoadKlassNode::make(_gvn, NULL, immutable_memory(), p, TypeInstPtr::KLASS));
   // Get the array klass
   const TypeKlassPtr *tak = _gvn.type(array_klass)->is_klassptr();
   // The type of array_klass is usually INexact array-of-oop.  Heroically
   // cast array_klass to EXACT array and uncommon-trap if the cast fails.
   // Make constant out of the inexact array klass, but use it only if the cast
   // succeeds.
   bool always_see_exact_class = false;
   if (MonomorphicArrayCheck
       && !too_many_traps(Deoptimization::Reason_array_check)
       && !tak->klass_is_exact()
       && tak != TypeKlassPtr::OBJECT) {
       // Regarding the fourth condition in the if-statement from above:
       //
       // If the compiler has determined that the type of array 'ary' (represented
       // by 'array_klass') is java/lang/Object, the compiler must not assume that
       // the array 'ary' is monomorphic.
       //
       // If 'ary' were of type java/lang/Object, this arraystore would have to fail,
       // because it is not possible to perform a arraystore into an object that is not
       // a "proper" array.
       //
       // Therefore, let's obtain at runtime the type of 'ary' and check if we can still
       // successfully perform the store.
       //
       // The implementation reasons for the condition are the following:
       //
       // java/lang/Object is the superclass of all arrays, but it is represented by the VM
       // as an InstanceKlass. The checks generated by gen_checkcast() (see below) expect
       // 'array_klass' to be ObjArrayKlass, which can result in invalid memory accesses.
       //
       // See issue JDK-8057622 for details.
     always_see_exact_class = true;
     // (If no MDO at all, hope for the best, until a trap actually occurs.)
     // Make a constant out of the inexact array klass
     const TypeKlassPtr *extak = tak->cast_to_exactness(true)->is_klassptr();
     Node* con = makecon(extak);
     Node* cmp = _gvn.transform(new (C) CmpPNode( array_klass, con ));
     Node* bol = _gvn.transform(new (C) BoolNode( cmp, BoolTest::eq ));
     Node* ctrl= control();
     { BuildCutout unless(this, bol, PROB_MAX);
       uncommon_trap(Deoptimization::Reason_array_check,
                     Deoptimization::Action_maybe_recompile,
                     tak->klass());
     }
     if (stopped()) {          // MUST uncommon-trap?
       set_control(ctrl);      // Then Don't Do It, just fall into the normal checking
     } else {                  // Cast array klass to exactness:
       // Use the exact constant value we know it is.
       replace_in_map(array_klass,con);
       CompileLog* log = C->log();
       if (log != NULL) {
         log->elem("cast_up reason='monomorphic_array' from='%d' to='(exact)'",
                   log->identify(tak->klass()));
       }
       array_klass = con;      // Use cast value moving forward
     }
   }
   // Come here for polymorphic array klasses
   // Extract the array element class
   int element_klass_offset = in_bytes(ObjArrayKlass::element_klass_offset());
   Node *p2 = basic_plus_adr(array_klass, array_klass, element_klass_offset);
   // We are allowed to use the constant type only if cast succeeded. If always_see_exact_class is true,
   // we must set a control edge from the IfTrue node created by the uncommon_trap above to the
   // LoadKlassNode.
   Node* a_e_klass = _gvn.transform(LoadKlassNode::make(_gvn, always_see_exact_class ? control() : NULL,
                                                        immutable_memory(), p2, tak));
   // Check (the hard way) and throw if not a subklass.
   // Result is ignored, we just need the CFG effects.
   gen_checkcast(obj, a_e_klass);
 }
 void Parse::emit_guard_for_new(ciInstanceKlass* klass) {
   // Emit guarded new
   //   if (klass->_init_thread != current_thread ||
   //       klass->_init_state != being_initialized)
   //      uncommon_trap
   Node* cur_thread = _gvn.transform( new (C) ThreadLocalNode() );
   Node* merge = new (C) RegionNode(3);
   _gvn.set_type(merge, Type::CONTROL);
   Node* kls = makecon(TypeKlassPtr::make(klass));
   Node* init_thread_offset = _gvn.MakeConX(in_bytes(InstanceKlass::init_thread_offset()));
   Node* adr_node = basic_plus_adr(kls, kls, init_thread_offset);
   Node* init_thread = make_load(NULL, adr_node, TypeRawPtr::BOTTOM, T_ADDRESS, MemNode::unordered);
   Node *tst   = Bool( CmpP( init_thread, cur_thread), BoolTest::eq);
   IfNode* iff = create_and_map_if(control(), tst, PROB_ALWAYS, COUNT_UNKNOWN);
   set_control(IfTrue(iff));
   merge->set_req(1, IfFalse(iff));
   Node* init_state_offset = _gvn.MakeConX(in_bytes(InstanceKlass::init_state_offset()));
   adr_node = basic_plus_adr(kls, kls, init_state_offset);
   // Use T_BOOLEAN for InstanceKlass::_init_state so the compiler
   // can generate code to load it as unsigned byte.
   Node* init_state = make_load(NULL, adr_node, TypeInt::UBYTE, T_BOOLEAN, MemNode::unordered);
   Node* being_init = _gvn.intcon(InstanceKlass::being_initialized);
   tst   = Bool( CmpI( init_state, being_init), BoolTest::eq);
   iff = create_and_map_if(control(), tst, PROB_ALWAYS, COUNT_UNKNOWN);
   set_control(IfTrue(iff));
   merge->set_req(2, IfFalse(iff));
   PreserveJVMState pjvms(this);
   record_for_igvn(merge);
   set_control(merge);
   uncommon_trap(Deoptimization::Reason_uninitialized,
                 Deoptimization::Action_reinterpret,
                 klass);
 }
 //------------------------------do_new-----------------------------------------
 void Parse::do_new() {
   kill_dead_locals();
   bool will_link;
   ciInstanceKlass* klass = iter().get_klass(will_link)->as_instance_klass();
   assert(will_link, "_new: typeflow responsibility");
   // Should initialize, or throw an InstantiationError?
   if (!klass->is_initialized() && !klass->is_being_initialized() ||
       klass->is_abstract() || klass->is_interface() ||
       klass->name() == ciSymbol::java_lang_Class() ||
       iter().is_unresolved_klass()) {
     uncommon_trap(Deoptimization::Reason_uninitialized,
                   Deoptimization::Action_reinterpret,
                   klass);
     return;
   }
   if (klass->is_being_initialized()) {
     emit_guard_for_new(klass);
   }
   Node* kls = makecon(TypeKlassPtr::make(klass));
   Node* obj = new_instance(kls);
   // Push resultant oop onto stack
   push(obj);
   // Keep track of whether opportunities exist for StringBuilder
   // optimizations.
   if (OptimizeStringConcat &&
       (klass == C->env()->StringBuilder_klass() ||
        klass == C->env()->StringBuffer_klass())) {
     C->set_has_stringbuilder(true);
   }
   // Keep track of boxed values for EliminateAutoBox optimizations.
   if (C->eliminate_boxing() && klass->is_box_klass()) {
     C->set_has_boxed_value(true);
   }
 }
 #ifndef PRODUCT
 //------------------------------dump_map_adr_mem-------------------------------
 // Debug dump of the mapping from address types to MergeMemNode indices.
 void Parse::dump_map_adr_mem() const {
   tty->print_cr("--- Mapping from address types to memory Nodes ---");
   MergeMemNode *mem = map() == NULL ? NULL : (map()->memory()->is_MergeMem() ?
                                       map()->memory()->as_MergeMem() : NULL);
   for (uint i = 0; i < (uint)C->num_alias_types(); i++) {
     C->alias_type(i)->print_on(tty);
     tty->print("\t");
     // Node mapping, if any
     if (mem && i < mem->req() && mem->in(i) && mem->in(i) != mem->empty_memory()) {
       mem->in(i)->dump();
     } else {
       tty->cr();
     }
   }
 }
 #endif
 //=============================================================================
 //
 // parser methods for profiling
 //----------------------test_counter_against_threshold ------------------------
 void Parse::test_counter_against_threshold(Node* cnt, int limit) {
   // Test the counter against the limit and uncommon trap if greater.
   // This code is largely copied from the range check code in
   // array_addressing()
   // Test invocation count vs threshold
   Node *threshold = makecon(TypeInt::make(limit));
   Node *chk   = _gvn.transform( new (C) CmpUNode( cnt, threshold) );
   BoolTest::mask btest = BoolTest::lt;
   Node *tst   = _gvn.transform( new (C) BoolNode( chk, btest) );
   // Branch to failure if threshold exceeded
   { BuildCutout unless(this, tst, PROB_ALWAYS);
     uncommon_trap(Deoptimization::Reason_age,
                   Deoptimization::Action_maybe_recompile);
   }
 }
 //----------------------increment_and_test_invocation_counter-------------------
 void Parse::increment_and_test_invocation_counter(int limit) {
   if (!count_invocations()) return;
   // Get the Method* node.
   ciMethod* m = method();
   MethodCounters* counters_adr = m->ensure_method_counters();
   if (counters_adr == NULL) {
     C->record_failure("method counters allocation failed");
     return;
   }
   Node* ctrl = control();
   const TypePtr* adr_type = TypeRawPtr::make((address) counters_adr);
   Node *counters_node = makecon(adr_type);
   Node* adr_iic_node = basic_plus_adr(counters_node, counters_node,
     MethodCounters::interpreter_invocation_counter_offset_in_bytes());
   Node* cnt = make_load(ctrl, adr_iic_node, TypeInt::INT, T_INT, adr_type, MemNode::unordered);
   test_counter_against_threshold(cnt, limit);
   // Add one to the counter and store
   Node* incr = _gvn.transform(new (C) AddINode(cnt, _gvn.intcon(1)));
   store_to_memory(ctrl, adr_iic_node, incr, T_INT, adr_type, MemNode::unordered);
 }
 //----------------------------method_data_addressing---------------------------
 Node* Parse::method_data_addressing(ciMethodData* md, ciProfileData* data, ByteSize counter_offset, Node* idx, uint stride) {
   // Get offset within MethodData* of the data array
   ByteSize data_offset = MethodData::data_offset();
   // Get cell offset of the ProfileData within data array
   int cell_offset = md->dp_to_di(data->dp());
   // Add in counter_offset, the # of bytes into the ProfileData of counter or flag
   int offset = in_bytes(data_offset) + cell_offset + in_bytes(counter_offset);
   const TypePtr* adr_type = TypeMetadataPtr::make(md);
   Node* mdo = makecon(adr_type);
   Node* ptr = basic_plus_adr(mdo, mdo, offset);
   if (stride != 0) {
     Node* str = _gvn.MakeConX(stride);
     Node* scale = _gvn.transform( new (C) MulXNode( idx, str ) );
     ptr   = _gvn.transform( new (C) AddPNode( mdo, ptr, scale ) );
   }
   return ptr;
 }
 //--------------------------increment_md_counter_at----------------------------
 void Parse::increment_md_counter_at(ciMethodData* md, ciProfileData* data, ByteSize counter_offset, Node* idx, uint stride) {
   Node* adr_node = method_data_addressing(md, data, counter_offset, idx, stride);
   const TypePtr* adr_type = _gvn.type(adr_node)->is_ptr();
   Node* cnt  = make_load(NULL, adr_node, TypeInt::INT, T_INT, adr_type, MemNode::unordered);
   Node* incr = _gvn.transform(new (C) AddINode(cnt, _gvn.intcon(DataLayout::counter_increment)));
   store_to_memory(NULL, adr_node, incr, T_INT, adr_type, MemNode::unordered);
 }
 //--------------------------test_for_osr_md_counter_at-------------------------
 void Parse::test_for_osr_md_counter_at(ciMethodData* md, ciProfileData* data, ByteSize counter_offset, int limit) {
   Node* adr_node = method_data_addressing(md, data, counter_offset);
   const TypePtr* adr_type = _gvn.type(adr_node)->is_ptr();
   Node* cnt  = make_load(NULL, adr_node, TypeInt::INT, T_INT, adr_type, MemNode::unordered);
   test_counter_against_threshold(cnt, limit);
 }
 //-------------------------------set_md_flag_at--------------------------------
 void Parse::set_md_flag_at(ciMethodData* md, ciProfileData* data, int flag_constant) {
   Node* adr_node = method_data_addressing(md, data, DataLayout::flags_offset());
   const TypePtr* adr_type = _gvn.type(adr_node)->is_ptr();
   Node* flags = make_load(NULL, adr_node, TypeInt::BYTE, T_BYTE, adr_type, MemNode::unordered);
   Node* incr = _gvn.transform(new (C) OrINode(flags, _gvn.intcon(flag_constant)));
   store_to_memory(NULL, adr_node, incr, T_BYTE, adr_type, MemNode::unordered);
 }
 //----------------------------profile_taken_branch-----------------------------
 void Parse::profile_taken_branch(int target_bci, bool force_update) {
   // This is a potential osr_site if we have a backedge.
   int cur_bci = bci();
   bool osr_site =
     (target_bci <= cur_bci) && count_invocations() && UseOnStackReplacement;
   // If we are going to OSR, restart at the target bytecode.
   set_bci(target_bci);
   // To do: factor out the the limit calculations below. These duplicate
   // the similar limit calculations in the interpreter.
   if (method_data_update() || force_update) {
     ciMethodData* md = method()->method_data();
     assert(md != NULL, "expected valid ciMethodData");
     ciProfileData* data = md->bci_to_data(cur_bci);
     assert(data->is_JumpData(), "need JumpData for taken branch");
     increment_md_counter_at(md, data, JumpData::taken_offset());
   }
   // In the new tiered system this is all we need to do. In the old
   // (c2 based) tiered sytem we must do the code below.
 #ifndef TIERED
   if (method_data_update()) {
     ciMethodData* md = method()->method_data();
     if (osr_site) {
       ciProfileData* data = md->bci_to_data(cur_bci);
       int limit = (CompileThreshold
                    * (OnStackReplacePercentage - InterpreterProfilePercentage)) / 100;
       test_for_osr_md_counter_at(md, data, JumpData::taken_offset(), limit);
     }
   } else {
     // With method data update off, use the invocation counter to trigger an
     // OSR compilation, as done in the interpreter.
     if (osr_site) {
       int limit = (CompileThreshold * OnStackReplacePercentage) / 100;
       increment_and_test_invocation_counter(limit);
     }
   }
 #endif // TIERED
   // Restore the original bytecode.
   set_bci(cur_bci);
 }
 //--------------------------profile_not_taken_branch---------------------------
 void Parse::profile_not_taken_branch(bool force_update) {
   if (method_data_update() || force_update) {
     ciMethodData* md = method()->method_data();
     assert(md != NULL, "expected valid ciMethodData");
     ciProfileData* data = md->bci_to_data(bci());
     assert(data->is_BranchData(), "need BranchData for not taken branch");
     increment_md_counter_at(md, data, BranchData::not_taken_offset());
   }
 }
 //---------------------------------profile_call--------------------------------
 void Parse::profile_call(Node* receiver) {
   if (!method_data_update()) return;
   switch (bc()) {
   case Bytecodes::_invokevirtual:
   case Bytecodes::_invokeinterface:
     profile_receiver_type(receiver);
     break;
   case Bytecodes::_invokestatic:
   case Bytecodes::_invokedynamic:
   case Bytecodes::_invokespecial:
     profile_generic_call();
     break;
   default: fatal("unexpected call bytecode");
   }
 }
 //------------------------------profile_generic_call---------------------------
 void Parse::profile_generic_call() {
   assert(method_data_update(), "must be generating profile code");
   ciMethodData* md = method()->method_data();
   assert(md != NULL, "expected valid ciMethodData");
   ciProfileData* data = md->bci_to_data(bci());
   assert(data->is_CounterData(), "need CounterData for not taken branch");
   increment_md_counter_at(md, data, CounterData::count_offset());
 }
 //-----------------------------profile_receiver_type---------------------------
 void Parse::profile_receiver_type(Node* receiver) {
   assert(method_data_update(), "must be generating profile code");
   ciMethodData* md = method()->method_data();
   assert(md != NULL, "expected valid ciMethodData");
   ciProfileData* data = md->bci_to_data(bci());
   assert(data->is_ReceiverTypeData(), "need ReceiverTypeData here");
   // Skip if we aren't tracking receivers
   if (TypeProfileWidth < 1) {
     increment_md_counter_at(md, data, CounterData::count_offset());
     return;
   }
   ciReceiverTypeData* rdata = (ciReceiverTypeData*)data->as_ReceiverTypeData();
   Node* method_data = method_data_addressing(md, rdata, in_ByteSize(0));
   // Using an adr_type of TypePtr::BOTTOM to work around anti-dep problems.
   // A better solution might be to use TypeRawPtr::BOTTOM with RC_NARROW_MEM.
   make_runtime_call(RC_LEAF, OptoRuntime::profile_receiver_type_Type(),
                     CAST_FROM_FN_PTR(address,
                                      OptoRuntime::profile_receiver_type_C),
                     "profile_receiver_type_C",
                     TypePtr::BOTTOM,
                     method_data, receiver);
 }
 //---------------------------------profile_ret---------------------------------
 void Parse::profile_ret(int target_bci) {
   if (!method_data_update()) return;
   // Skip if we aren't tracking ret targets
   if (TypeProfileWidth < 1) return;
   ciMethodData* md = method()->method_data();
   assert(md != NULL, "expected valid ciMethodData");
   ciProfileData* data = md->bci_to_data(bci());
   assert(data->is_RetData(), "need RetData for ret");
   ciRetData* ret_data = (ciRetData*)data->as_RetData();
   // Look for the target_bci is already in the table
   uint row;
   bool table_full = true;
   for (row = 0; row < ret_data->row_limit(); row++) {
     int key = ret_data->bci(row);
     table_full &= (key != RetData::no_bci);
     if (key == target_bci) break;
   }
   if (row >= ret_data->row_limit()) {
     // The target_bci was not found in the table.
     if (!table_full) {
       // XXX: Make slow call to update RetData
     }
     return;
   }
   // the target_bci is already in the table
   increment_md_counter_at(md, data, RetData::bci_count_offset(row));
 }
 //--------------------------profile_null_checkcast----------------------------
 void Parse::profile_null_checkcast() {
   // Set the null-seen flag, done in conjunction with the usual null check. We
   // never unset the flag, so this is a one-way switch.
   if (!method_data_update()) return;
   ciMethodData* md = method()->method_data();
   assert(md != NULL, "expected valid ciMethodData");
   ciProfileData* data = md->bci_to_data(bci());
   assert(data->is_BitData(), "need BitData for checkcast");
   set_md_flag_at(md, data, BitData::null_seen_byte_constant());
 }
 //-----------------------------profile_switch_case-----------------------------
 void Parse::profile_switch_case(int table_index) {
   if (!method_data_update()) return;
   ciMethodData* md = method()->method_data();
   assert(md != NULL, "expected valid ciMethodData");
   ciProfileData* data = md->bci_to_data(bci());
   assert(data->is_MultiBranchData(), "need MultiBranchData for switch case");
   if (table_index >= 0) {
     increment_md_counter_at(md, data, MultiBranchData::case_count_offset(table_index));
   } else {
     increment_md_counter_at(md, data, MultiBranchData::default_count_offset());
   }
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/opto/parseHelper.cpp@c1c199dde5c9 (annotated)

src/share/vm/opto/parseHelper.cpp