jdk8-mips64-public/hotspot: src/share/vm/opto/parse3.cpp@6deeaebad47a (annotated)

src/share/vm/opto/parse3.cpp@6deeaebad47a (annotated)

src/share/vm/opto/parse3.cpp

Mon, 01 Feb 2010 17:35:05 -0700

author: dcubed
date: Mon, 01 Feb 2010 17:35:05 -0700
changeset 1648: 6deeaebad47a
parent 1573: dd57230ba8fe
child 1687: f516d5d7a019
permissions: -rw-r--r--

6902182: 4/4 Starting with jdwp agent should not incur performance penalty
Summary: Rename can_post_exceptions support to can_post_on_exceptions. Add support for should_post_on_exceptions flag to permit per JavaThread optimizations.
Reviewed-by: never, kvn, dcubed
Contributed-by: tom.deneau@amd.com

 /*
  * Copyright 1998-2009 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  *
  */
 #include "incls/_precompiled.incl"
 #include "incls/_parse3.cpp.incl"
 //=============================================================================
 // Helper methods for _get* and _put* bytecodes
 //=============================================================================
 bool Parse::static_field_ok_in_clinit(ciField *field, ciMethod *method) {
   // Could be the field_holder's <clinit> method, or <clinit> for a subklass.
   // Better to check now than to Deoptimize as soon as we execute
   assert( field->is_static(), "Only check if field is static");
   // is_being_initialized() is too generous.  It allows access to statics
   // by threads that are not running the <clinit> before the <clinit> finishes.
   // return field->holder()->is_being_initialized();
   // The following restriction is correct but conservative.
   // It is also desirable to allow compilation of methods called from <clinit>
   // but this generated code will need to be made safe for execution by
   // other threads, or the transition from interpreted to compiled code would
   // need to be guarded.
   ciInstanceKlass *field_holder = field->holder();
   bool access_OK = false;
   if (method->holder()->is_subclass_of(field_holder)) {
     if (method->is_static()) {
       if (method->name() == ciSymbol::class_initializer_name()) {
         // OK to access static fields inside initializer
         access_OK = true;
       }
     } else {
       if (method->name() == ciSymbol::object_initializer_name()) {
         // It's also OK to access static fields inside a constructor,
         // because any thread calling the constructor must first have
         // synchronized on the class by executing a '_new' bytecode.
         access_OK = true;
       }
     }
   }
   return access_OK;
 }
 void Parse::do_field_access(bool is_get, bool is_field) {
   bool will_link;
   ciField* field = iter().get_field(will_link);
   assert(will_link, "getfield: typeflow responsibility");
   ciInstanceKlass* field_holder = field->holder();
   if (is_field == field->is_static()) {
     // Interpreter will throw java_lang_IncompatibleClassChangeError
     // Check this before allowing <clinit> methods to access static fields
     uncommon_trap(Deoptimization::Reason_unhandled,
                   Deoptimization::Action_none);
     return;
   }
   if (!is_field && !field_holder->is_initialized()) {
     if (!static_field_ok_in_clinit(field, method())) {
       uncommon_trap(Deoptimization::Reason_uninitialized,
                     Deoptimization::Action_reinterpret,
                     NULL, "!static_field_ok_in_clinit");
       return;
     }
   }
   assert(field->will_link(method()->holder(), bc()), "getfield: typeflow responsibility");
   // Note:  We do not check for an unloaded field type here any more.
   // Generate code for the object pointer.
   Node* obj;
   if (is_field) {
     int obj_depth = is_get ? 0 : field->type()->size();
     obj = do_null_check(peek(obj_depth), T_OBJECT);
     // Compile-time detect of null-exception?
     if (stopped())  return;
     const TypeInstPtr *tjp = TypeInstPtr::make(TypePtr::NotNull, iter().get_declared_field_holder());
     assert(_gvn.type(obj)->higher_equal(tjp), "cast_up is no longer needed");
     if (is_get) {
       --_sp;  // pop receiver before getting
       do_get_xxx(tjp, obj, field, is_field);
     } else {
       do_put_xxx(tjp, obj, field, is_field);
       --_sp;  // pop receiver after putting
     }
   } else {
     const TypeKlassPtr* tkp = TypeKlassPtr::make(field_holder);
     obj = _gvn.makecon(tkp);
     if (is_get) {
       do_get_xxx(tkp, obj, field, is_field);
     } else {
       do_put_xxx(tkp, obj, field, is_field);
     }
   }
 }
 void Parse::do_get_xxx(const TypePtr* obj_type, Node* obj, ciField* field, bool is_field) {
   // Does this field have a constant value?  If so, just push the value.
   if (field->is_constant()) {
     if (field->is_static()) {
       // final static field
       if (push_constant(field->constant_value()))
         return;
     }
     else {
       // final non-static field of a trusted class ({java,sun}.dyn
       // classes).
       if (obj->is_Con()) {
         const TypeOopPtr* oop_ptr = obj->bottom_type()->isa_oopptr();
         ciObject* constant_oop = oop_ptr->const_oop();
         ciConstant constant = field->constant_value_of(constant_oop);
         if (push_constant(constant, true))
           return;
       }
     }
   }
   ciType* field_klass = field->type();
   bool is_vol = field->is_volatile();
   // Compute address and memory type.
   int offset = field->offset_in_bytes();
   const TypePtr* adr_type = C->alias_type(field)->adr_type();
   Node *adr = basic_plus_adr(obj, obj, offset);
   BasicType bt = field->layout_type();
   // Build the resultant type of the load
   const Type *type;
   bool must_assert_null = false;
   if( bt == T_OBJECT ) {
     if (!field->type()->is_loaded()) {
       type = TypeInstPtr::BOTTOM;
       must_assert_null = true;
     } else if (field->is_constant() && field->is_static()) {
       // This can happen if the constant oop is non-perm.
       ciObject* con = field->constant_value().as_object();
       // Do not "join" in the previous type; it doesn't add value,
       // and may yield a vacuous result if the field is of interface type.
       type = TypeOopPtr::make_from_constant(con)->isa_oopptr();
       assert(type != NULL, "field singleton type must be consistent");
     } else {
       type = TypeOopPtr::make_from_klass(field_klass->as_klass());
     }
   } else {
     type = Type::get_const_basic_type(bt);
   }
   // Build the load.
   Node* ld = make_load(NULL, adr, type, bt, adr_type, is_vol);
   // Adjust Java stack
   if (type2size[bt] == 1)
     push(ld);
   else
     push_pair(ld);
   if (must_assert_null) {
     // Do not take a trap here.  It's possible that the program
     // will never load the field's class, and will happily see
     // null values in this field forever.  Don't stumble into a
     // trap for such a program, or we might get a long series
     // of useless recompilations.  (Or, we might load a class
     // which should not be loaded.)  If we ever see a non-null
     // value, we will then trap and recompile.  (The trap will
     // not need to mention the class index, since the class will
     // already have been loaded if we ever see a non-null value.)
     // uncommon_trap(iter().get_field_signature_index());
 #ifndef PRODUCT
     if (PrintOpto && (Verbose || WizardMode)) {
       method()->print_name(); tty->print_cr(" asserting nullness of field at bci: %d", bci());
     }
 #endif
     if (C->log() != NULL) {
       C->log()->elem("assert_null reason='field' klass='%d'",
                      C->log()->identify(field->type()));
     }
     // If there is going to be a trap, put it at the next bytecode:
     set_bci(iter().next_bci());
     do_null_assert(peek(), T_OBJECT);
     set_bci(iter().cur_bci()); // put it back
   }
   // If reference is volatile, prevent following memory ops from
   // floating up past the volatile read.  Also prevents commoning
   // another volatile read.
   if (field->is_volatile()) {
     // Memory barrier includes bogus read of value to force load BEFORE membar
     insert_mem_bar(Op_MemBarAcquire, ld);
   }
 }
 void Parse::do_put_xxx(const TypePtr* obj_type, Node* obj, ciField* field, bool is_field) {
   bool is_vol = field->is_volatile();
   // If reference is volatile, prevent following memory ops from
   // floating down past the volatile write.  Also prevents commoning
   // another volatile read.
   if (is_vol)  insert_mem_bar(Op_MemBarRelease);
   // Compute address and memory type.
   int offset = field->offset_in_bytes();
   const TypePtr* adr_type = C->alias_type(field)->adr_type();
   Node* adr = basic_plus_adr(obj, obj, offset);
   BasicType bt = field->layout_type();
   // Value to be stored
   Node* val = type2size[bt] == 1 ? pop() : pop_pair();
   // Round doubles before storing
   if (bt == T_DOUBLE)  val = dstore_rounding(val);
   // Store the value.
   Node* store;
   if (bt == T_OBJECT) {
     const TypeOopPtr* field_type;
     if (!field->type()->is_loaded()) {
       field_type = TypeInstPtr::BOTTOM;
     } else {
       field_type = TypeOopPtr::make_from_klass(field->type()->as_klass());
     }
     store = store_oop_to_object( control(), obj, adr, adr_type, val, field_type, bt);
   } else {
     store = store_to_memory( control(), adr, val, bt, adr_type, is_vol );
   }
   // If reference is volatile, prevent following volatiles ops from
   // floating up before the volatile write.
   if (is_vol) {
     // First place the specific membar for THIS volatile index. This first
     // membar is dependent on the store, keeping any other membars generated
     // below from floating up past the store.
     int adr_idx = C->get_alias_index(adr_type);
     insert_mem_bar_volatile(Op_MemBarVolatile, adr_idx, store);
     // Now place a membar for AliasIdxBot for the unknown yet-to-be-parsed
     // volatile alias indices. Skip this if the membar is redundant.
     if (adr_idx != Compile::AliasIdxBot) {
       insert_mem_bar_volatile(Op_MemBarVolatile, Compile::AliasIdxBot, store);
     }
     // Finally, place alias-index-specific membars for each volatile index
     // that isn't the adr_idx membar. Typically there's only 1 or 2.
     for( int i = Compile::AliasIdxRaw; i < C->num_alias_types(); i++ ) {
       if (i != adr_idx && C->alias_type(i)->is_volatile()) {
         insert_mem_bar_volatile(Op_MemBarVolatile, i, store);
       }
     }
   }
   // If the field is final, the rules of Java say we are in <init> or <clinit>.
   // Note the presence of writes to final non-static fields, so that we
   // can insert a memory barrier later on to keep the writes from floating
   // out of the constructor.
   if (is_field && field->is_final()) {
     set_wrote_final(true);
   }
 }
 bool Parse::push_constant(ciConstant constant, bool require_constant) {
   switch (constant.basic_type()) {
   case T_BOOLEAN:  push( intcon(constant.as_boolean()) ); break;
   case T_INT:      push( intcon(constant.as_int())     ); break;
   case T_CHAR:     push( intcon(constant.as_char())    ); break;
   case T_BYTE:     push( intcon(constant.as_byte())    ); break;
   case T_SHORT:    push( intcon(constant.as_short())   ); break;
   case T_FLOAT:    push( makecon(TypeF::make(constant.as_float())) );  break;
   case T_DOUBLE:   push_pair( makecon(TypeD::make(constant.as_double())) );  break;
   case T_LONG:     push_pair( longcon(constant.as_long()) ); break;
   case T_ARRAY:
   case T_OBJECT: {
     // cases:
     //   can_be_constant    = (oop not scavengable || ScavengeRootsInCode != 0)
     //   should_be_constant = (oop not scavengable || ScavengeRootsInCode >= 2)
     // An oop is not scavengable if it is in the perm gen.
     ciObject* oop_constant = constant.as_object();
     if (oop_constant->is_null_object()) {
       push( zerocon(T_OBJECT) );
       break;
     } else if (require_constant || oop_constant->should_be_constant()) {
       push( makecon(TypeOopPtr::make_from_constant(oop_constant, require_constant)) );
       break;
     } else {
       // we cannot inline the oop, but we can use it later to narrow a type
       return false;
     }
   }
   case T_ILLEGAL: {
     // Invalid ciConstant returned due to OutOfMemoryError in the CI
     assert(C->env()->failing(), "otherwise should not see this");
     // These always occur because of object types; we are going to
     // bail out anyway, so make the stack depths match up
     push( zerocon(T_OBJECT) );
     return false;
   }
   default:
     ShouldNotReachHere();
     return false;
   }
   // success
   return true;
 }
 //=============================================================================
 void Parse::do_anewarray() {
   bool will_link;
   ciKlass* klass = iter().get_klass(will_link);
   // Uncommon Trap when class that array contains is not loaded
   // we need the loaded class for the rest of graph; do not
   // initialize the container class (see Java spec)!!!
   assert(will_link, "anewarray: typeflow responsibility");
   ciObjArrayKlass* array_klass = ciObjArrayKlass::make(klass);
   // Check that array_klass object is loaded
   if (!array_klass->is_loaded()) {
     // Generate uncommon_trap for unloaded array_class
     uncommon_trap(Deoptimization::Reason_unloaded,
                   Deoptimization::Action_reinterpret,
                   array_klass);
     return;
   }
   kill_dead_locals();
   const TypeKlassPtr* array_klass_type = TypeKlassPtr::make(array_klass);
   Node* count_val = pop();
   Node* obj = new_array(makecon(array_klass_type), count_val, 1);
   push(obj);
 }
 void Parse::do_newarray(BasicType elem_type) {
   kill_dead_locals();
   Node*   count_val = pop();
   const TypeKlassPtr* array_klass = TypeKlassPtr::make(ciTypeArrayKlass::make(elem_type));
   Node*   obj = new_array(makecon(array_klass), count_val, 1);
   // Push resultant oop onto stack
   push(obj);
 }
 // Expand simple expressions like new int[3][5] and new Object[2][nonConLen].
 // Also handle the degenerate 1-dimensional case of anewarray.
 Node* Parse::expand_multianewarray(ciArrayKlass* array_klass, Node* *lengths, int ndimensions, int nargs) {
   Node* length = lengths[0];
   assert(length != NULL, "");
   Node* array = new_array(makecon(TypeKlassPtr::make(array_klass)), length, nargs);
   if (ndimensions > 1) {
     jint length_con = find_int_con(length, -1);
     guarantee(length_con >= 0, "non-constant multianewarray");
     ciArrayKlass* array_klass_1 = array_klass->as_obj_array_klass()->element_klass()->as_array_klass();
     const TypePtr* adr_type = TypeAryPtr::OOPS;
     const TypeOopPtr*    elemtype = _gvn.type(array)->is_aryptr()->elem()->make_oopptr();
     const intptr_t header   = arrayOopDesc::base_offset_in_bytes(T_OBJECT);
     for (jint i = 0; i < length_con; i++) {
       Node*    elem   = expand_multianewarray(array_klass_1, &lengths[1], ndimensions-1, nargs);
       intptr_t offset = header + ((intptr_t)i << LogBytesPerHeapOop);
       Node*    eaddr  = basic_plus_adr(array, offset);
       store_oop_to_array(control(), array, eaddr, adr_type, elem, elemtype, T_OBJECT);
     }
   }
   return array;
 }
 void Parse::do_multianewarray() {
   int ndimensions = iter().get_dimensions();
   // the m-dimensional array
   bool will_link;
   ciArrayKlass* array_klass = iter().get_klass(will_link)->as_array_klass();
   assert(will_link, "multianewarray: typeflow responsibility");
   // Note:  Array classes are always initialized; no is_initialized check.
   enum { MAX_DIMENSION = 5 };
   if (ndimensions > MAX_DIMENSION || ndimensions <= 0) {
     uncommon_trap(Deoptimization::Reason_unhandled,
                   Deoptimization::Action_none);
     return;
   }
   kill_dead_locals();
   // get the lengths from the stack (first dimension is on top)
   Node* length[MAX_DIMENSION+1];
   length[ndimensions] = NULL;  // terminating null for make_runtime_call
   int j;
   for (j = ndimensions-1; j >= 0 ; j--) length[j] = pop();
   // The original expression was of this form: new T[length0][length1]...
   // It is often the case that the lengths are small (except the last).
   // If that happens, use the fast 1-d creator a constant number of times.
   const jint expand_limit = MIN2((juint)MultiArrayExpandLimit, (juint)100);
   jint expand_count = 1;        // count of allocations in the expansion
   jint expand_fanout = 1;       // running total fanout
   for (j = 0; j < ndimensions-1; j++) {
     jint dim_con = find_int_con(length[j], -1);
     expand_fanout *= dim_con;
     expand_count  += expand_fanout; // count the level-J sub-arrays
     if (dim_con <= 0
         || dim_con > expand_limit
         || expand_count > expand_limit) {
       expand_count = 0;
       break;
     }
   }
   // Can use multianewarray instead of [a]newarray if only one dimension,
   // or if all non-final dimensions are small constants.
   if (expand_count == 1 || (1 <= expand_count && expand_count <= expand_limit)) {
     Node* obj = expand_multianewarray(array_klass, &length[0], ndimensions, ndimensions);
     push(obj);
     return;
   }
   address fun = NULL;
   switch (ndimensions) {
   //case 1: Actually, there is no case 1.  It's handled by new_array.
   case 2: fun = OptoRuntime::multianewarray2_Java(); break;
   case 3: fun = OptoRuntime::multianewarray3_Java(); break;
   case 4: fun = OptoRuntime::multianewarray4_Java(); break;
   case 5: fun = OptoRuntime::multianewarray5_Java(); break;
   default: ShouldNotReachHere();
   };
   Node* c = make_runtime_call(RC_NO_LEAF | RC_NO_IO,
                               OptoRuntime::multianewarray_Type(ndimensions),
                               fun, NULL, TypeRawPtr::BOTTOM,
                               makecon(TypeKlassPtr::make(array_klass)),
                               length[0], length[1], length[2],
                               length[3], length[4]);
   Node* res = _gvn.transform(new (C, 1) ProjNode(c, TypeFunc::Parms));
   const Type* type = TypeOopPtr::make_from_klass_raw(array_klass);
   // Improve the type:  We know it's not null, exact, and of a given length.
   type = type->is_ptr()->cast_to_ptr_type(TypePtr::NotNull);
   type = type->is_aryptr()->cast_to_exactness(true);
   const TypeInt* ltype = _gvn.find_int_type(length[0]);
   if (ltype != NULL)
     type = type->is_aryptr()->cast_to_size(ltype);
   // We cannot sharpen the nested sub-arrays, since the top level is mutable.
   Node* cast = _gvn.transform( new (C, 2) CheckCastPPNode(control(), res, type) );
   push(cast);
   // Possible improvements:
   // - Make a fast path for small multi-arrays.  (W/ implicit init. loops.)
   // - Issue CastII against length[*] values, to TypeInt::POS.
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/opto/parse3.cpp@6deeaebad47a (annotated)

src/share/vm/opto/parse3.cpp