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 /*

  * 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.

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  */

 #include "precompiled.hpp"

 #include "compiler/compileLog.hpp"

 #include "interpreter/linkResolver.hpp"

 #include "memory/universe.inline.hpp"

 #include "oops/objArrayKlass.hpp"

 #include "opto/addnode.hpp"

 #include "opto/memnode.hpp"

 #include "opto/parse.hpp"

 #include "opto/rootnode.hpp"

 #include "opto/runtime.hpp"

 #include "opto/subnode.hpp"

 #include "runtime/deoptimization.hpp"

 #include "runtime/handles.inline.hpp"

 //=============================================================================

 // 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;

     }

   }

   // Deoptimize on putfield writes to call site target field.

   if (!is_get && field->is_call_site_target()) {

     uncommon_trap(Deoptimization::Reason_unhandled,

                   Deoptimization::Action_reinterpret,

                   NULL, "put to call site target field");

     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 = null_check(peek(obj_depth));

     // Compile-time detect of null-exception?

     if (stopped())  return;

 #ifdef ASSERT

     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");

 #endif

     if (is_get) {

       (void) pop();  // pop receiver before getting

       do_get_xxx(obj, field, is_field);

     } else {

       do_put_xxx(obj, field, is_field);

       (void) pop();  // pop receiver after putting

     }

   } else {

     const TypeInstPtr* tip = TypeInstPtr::make(field_holder->java_mirror());

     obj = _gvn.makecon(tip);

     if (is_get) {

       do_get_xxx(obj, field, is_field);

     } else {

       do_put_xxx(obj, field, is_field);

     }

   }

 }

 void Parse::do_get_xxx(Node* obj, ciField* field, bool is_field) {

   // Does this field have a constant value?  If so, just push the value.

   if (field->is_constant()) {

     // final field

     if (field->is_static()) {

       // final static field

       if (C->eliminate_boxing()) {

         // The pointers in the autobox arrays are always non-null.

         ciSymbol* klass_name = field->holder()->name();

         if (field->name() == ciSymbol::cache_field_name() &&

             field->holder()->uses_default_loader() &&

             (klass_name == ciSymbol::java_lang_Character_CharacterCache() ||

              klass_name == ciSymbol::java_lang_Byte_ByteCache() ||

              klass_name == ciSymbol::java_lang_Short_ShortCache() ||

              klass_name == ciSymbol::java_lang_Integer_IntegerCache() ||

              klass_name == ciSymbol::java_lang_Long_LongCache())) {

           bool require_const = true;

           bool autobox_cache = true;

           if (push_constant(field->constant_value(), require_const, autobox_cache)) {

             return;

           }

         }

       }

       if (push_constant(field->constant_value()))

         return;

     }

     else {

       // final non-static field

       // Treat final non-static fields of trusted classes (classes in

       // java.lang.invoke and sun.invoke packages and subpackages) as

       // compile time constants.

       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());

     null_assert(peek());

     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(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) {

     insert_mem_bar(Op_MemBarVolatile); // Use fat membar

   }

   // 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);

     // Preserve allocation ptr to create precedent edge to it in membar

     // generated on exit from constructor.

     if (C->eliminate_boxing() &&

         adr_type->isa_oopptr() && adr_type->is_oopptr()->is_ptr_to_boxed_value() &&

         AllocateNode::Ideal_allocation(obj, &_gvn) != NULL) {

       set_alloc_with_final(obj);

     }

   }

 }

 bool Parse::push_constant(ciConstant constant, bool require_constant, bool is_autobox_cache) {

   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, is_autobox_cache)) );

       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.

   kill_dead_locals();

   // get the lengths from the stack (first dimension is on top)

   Node** length = NEW_RESOURCE_ARRAY(Node*, ndimensions + 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 (ndimensions == 1 || (1 <= expand_count && expand_count <= expand_limit)) {

     Node* obj = NULL;

     // Set the original stack and the reexecute bit for the interpreter

     // to reexecute the multianewarray bytecode if deoptimization happens.

     // Do it unconditionally even for one dimension multianewarray.

     // Note: the reexecute bit will be set in GraphKit::add_safepoint_edges()

     // when AllocateArray node for newarray is created.

     { PreserveReexecuteState preexecs(this);

       inc_sp(ndimensions);

       // Pass 0 as nargs since uncommon trap code does not need to restore stack.

       obj = expand_multianewarray(array_klass, &length[0], ndimensions, 0);

     } //original reexecute and sp are set back here

     push(obj);

     return;

   }

   address fun = NULL;

   switch (ndimensions) {

   case 1: ShouldNotReachHere(); break;

   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;

   };

   Node* c = NULL;

   if (fun != NULL) {

     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],

                           (ndimensions > 2) ? length[3] : NULL,

                           (ndimensions > 3) ? length[4] : NULL);

   } else {

     // Create a java array for dimension sizes

     Node* dims = NULL;

     { PreserveReexecuteState preexecs(this);

       inc_sp(ndimensions);

       Node* dims_array_klass = makecon(TypeKlassPtr::make(ciArrayKlass::make(ciType::make(T_INT))));

       dims = new_array(dims_array_klass, intcon(ndimensions), 0);

       // Fill-in it with values

       for (j = 0; j < ndimensions; j++) {

         Node *dims_elem = array_element_address(dims, intcon(j), T_INT);

         store_to_memory(control(), dims_elem, length[j], T_INT, TypeAryPtr::INTS);

       }

     }

     c = make_runtime_call(RC_NO_LEAF | RC_NO_IO,

                           OptoRuntime::multianewarrayN_Type(),

                           OptoRuntime::multianewarrayN_Java(), NULL, TypeRawPtr::BOTTOM,

                           makecon(TypeKlassPtr::make(array_klass)),

                           dims);

   }

   make_slow_call_ex(c, env()->Throwable_klass(), false);

   Node* res = _gvn.transform(new (C) 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) 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.

 }