jdk8-mips64-public/hotspot: src/share/vm/ci/ciEnv.cpp@b2ee5dc63353 (annotated)

src/share/vm/ci/ciEnv.cpp@b2ee5dc63353 (annotated)

src/share/vm/ci/ciEnv.cpp

Wed, 23 Oct 2013 12:40:23 +0200

author: roland
date: Wed, 23 Oct 2013 12:40:23 +0200
changeset 5991: b2ee5dc63353
parent 5904: 5cc2d82aa82a
child 5971: b8860472c377
permissions: -rw-r--r--

8024070: C2 needs some form of type speculation
Summary: record unused type profile information with type system, propagate and use it.
Reviewed-by: kvn, twisti

 /*
  * Copyright (c) 1999, 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 "ci/ciConstant.hpp"
 #include "ci/ciEnv.hpp"
 #include "ci/ciField.hpp"
 #include "ci/ciInstance.hpp"
 #include "ci/ciInstanceKlass.hpp"
 #include "ci/ciMethod.hpp"
 #include "ci/ciNullObject.hpp"
 #include "ci/ciReplay.hpp"
 #include "ci/ciUtilities.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "classfile/vmSymbols.hpp"
 #include "code/scopeDesc.hpp"
 #include "compiler/compileBroker.hpp"
 #include "compiler/compileLog.hpp"
 #include "compiler/compilerOracle.hpp"
 #include "gc_interface/collectedHeap.inline.hpp"
 #include "interpreter/linkResolver.hpp"
 #include "memory/allocation.inline.hpp"
 #include "memory/oopFactory.hpp"
 #include "memory/universe.inline.hpp"
 #include "oops/methodData.hpp"
 #include "oops/objArrayKlass.hpp"
 #include "oops/oop.inline.hpp"
 #include "oops/oop.inline2.hpp"
 #include "prims/jvmtiExport.hpp"
 #include "runtime/init.hpp"
 #include "runtime/reflection.hpp"
 #include "runtime/sharedRuntime.hpp"
 #include "utilities/dtrace.hpp"
 #include "utilities/macros.hpp"
 #ifdef COMPILER1
 #include "c1/c1_Runtime1.hpp"
 #endif
 #ifdef COMPILER2
 #include "opto/runtime.hpp"
 #endif
 // ciEnv
 //
 // This class is the top level broker for requests from the compiler
 // to the VM.
 ciObject*              ciEnv::_null_object_instance;
 #define WK_KLASS_DEFN(name, ignore_s, ignore_o) ciInstanceKlass* ciEnv::_##name = NULL;
 WK_KLASSES_DO(WK_KLASS_DEFN)
 #undef WK_KLASS_DEFN
 ciSymbol*        ciEnv::_unloaded_cisymbol = NULL;
 ciInstanceKlass* ciEnv::_unloaded_ciinstance_klass = NULL;
 ciObjArrayKlass* ciEnv::_unloaded_ciobjarrayklass = NULL;
 jobject ciEnv::_ArrayIndexOutOfBoundsException_handle = NULL;
 jobject ciEnv::_ArrayStoreException_handle = NULL;
 jobject ciEnv::_ClassCastException_handle = NULL;
 #ifndef PRODUCT
 static bool firstEnv = true;
 #endif /* PRODUCT */
 // ------------------------------------------------------------------
 // ciEnv::ciEnv
 ciEnv::ciEnv(CompileTask* task, int system_dictionary_modification_counter) {
   VM_ENTRY_MARK;
   // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
   thread->set_env(this);
   assert(ciEnv::current() == this, "sanity");
   _oop_recorder = NULL;
   _debug_info = NULL;
   _dependencies = NULL;
   _failure_reason = NULL;
   _compilable = MethodCompilable;
   _break_at_compile = false;
   _compiler_data = NULL;
 #ifndef PRODUCT
   assert(!firstEnv, "not initialized properly");
 #endif /* !PRODUCT */
   _system_dictionary_modification_counter = system_dictionary_modification_counter;
   _num_inlined_bytecodes = 0;
   assert(task == NULL || thread->task() == task, "sanity");
   _task = task;
   _log = NULL;
   // Temporary buffer for creating symbols and such.
   _name_buffer = NULL;
   _name_buffer_len = 0;
   _arena   = &_ciEnv_arena;
   _factory = new (_arena) ciObjectFactory(_arena, 128);
   // Preload commonly referenced system ciObjects.
   // During VM initialization, these instances have not yet been created.
   // Assertions ensure that these instances are not accessed before
   // their initialization.
   assert(Universe::is_fully_initialized(), "should be complete");
   oop o = Universe::null_ptr_exception_instance();
   assert(o != NULL, "should have been initialized");
   _NullPointerException_instance = get_object(o)->as_instance();
   o = Universe::arithmetic_exception_instance();
   assert(o != NULL, "should have been initialized");
   _ArithmeticException_instance = get_object(o)->as_instance();
   _ArrayIndexOutOfBoundsException_instance = NULL;
   _ArrayStoreException_instance = NULL;
   _ClassCastException_instance = NULL;
   _the_null_string = NULL;
   _the_min_jint_string = NULL;
 }
 ciEnv::ciEnv(Arena* arena) {
   ASSERT_IN_VM;
   // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
   CompilerThread* current_thread = CompilerThread::current();
   assert(current_thread->env() == NULL, "must be");
   current_thread->set_env(this);
   assert(ciEnv::current() == this, "sanity");
   _oop_recorder = NULL;
   _debug_info = NULL;
   _dependencies = NULL;
   _failure_reason = NULL;
   _compilable = MethodCompilable_never;
   _break_at_compile = false;
   _compiler_data = NULL;
 #ifndef PRODUCT
   assert(firstEnv, "must be first");
   firstEnv = false;
 #endif /* !PRODUCT */
   _system_dictionary_modification_counter = 0;
   _num_inlined_bytecodes = 0;
   _task = NULL;
   _log = NULL;
   // Temporary buffer for creating symbols and such.
   _name_buffer = NULL;
   _name_buffer_len = 0;
   _arena   = arena;
   _factory = new (_arena) ciObjectFactory(_arena, 128);
   // Preload commonly referenced system ciObjects.
   // During VM initialization, these instances have not yet been created.
   // Assertions ensure that these instances are not accessed before
   // their initialization.
   assert(Universe::is_fully_initialized(), "must be");
   _NullPointerException_instance = NULL;
   _ArithmeticException_instance = NULL;
   _ArrayIndexOutOfBoundsException_instance = NULL;
   _ArrayStoreException_instance = NULL;
   _ClassCastException_instance = NULL;
   _the_null_string = NULL;
   _the_min_jint_string = NULL;
 }
 ciEnv::~ciEnv() {
   CompilerThread* current_thread = CompilerThread::current();
   _factory->remove_symbols();
   // Need safepoint to clear the env on the thread.  RedefineClasses might
   // be reading it.
   GUARDED_VM_ENTRY(current_thread->set_env(NULL);)
 }
 // ------------------------------------------------------------------
 // Cache Jvmti state
 void ciEnv::cache_jvmti_state() {
   VM_ENTRY_MARK;
   // Get Jvmti capabilities under lock to get consistant values.
   MutexLocker mu(JvmtiThreadState_lock);
   _jvmti_can_hotswap_or_post_breakpoint = JvmtiExport::can_hotswap_or_post_breakpoint();
   _jvmti_can_access_local_variables     = JvmtiExport::can_access_local_variables();
   _jvmti_can_post_on_exceptions         = JvmtiExport::can_post_on_exceptions();
 }
 // ------------------------------------------------------------------
 // Cache DTrace flags
 void ciEnv::cache_dtrace_flags() {
   // Need lock?
   _dtrace_extended_probes = ExtendedDTraceProbes;
   if (_dtrace_extended_probes) {
     _dtrace_monitor_probes  = true;
     _dtrace_method_probes   = true;
     _dtrace_alloc_probes    = true;
   } else {
     _dtrace_monitor_probes  = DTraceMonitorProbes;
     _dtrace_method_probes   = DTraceMethodProbes;
     _dtrace_alloc_probes    = DTraceAllocProbes;
   }
 }
 // ------------------------------------------------------------------
 // helper for lazy exception creation
 ciInstance* ciEnv::get_or_create_exception(jobject& handle, Symbol* name) {
   VM_ENTRY_MARK;
   if (handle == NULL) {
     // Cf. universe.cpp, creation of Universe::_null_ptr_exception_instance.
     Klass* k = SystemDictionary::find(name, Handle(), Handle(), THREAD);
     jobject objh = NULL;
     if (!HAS_PENDING_EXCEPTION && k != NULL) {
       oop obj = InstanceKlass::cast(k)->allocate_instance(THREAD);
       if (!HAS_PENDING_EXCEPTION)
         objh = JNIHandles::make_global(obj);
     }
     if (HAS_PENDING_EXCEPTION) {
       CLEAR_PENDING_EXCEPTION;
     } else {
       handle = objh;
     }
   }
   oop obj = JNIHandles::resolve(handle);
   return obj == NULL? NULL: get_object(obj)->as_instance();
 }
 ciInstance* ciEnv::ArrayIndexOutOfBoundsException_instance() {
   if (_ArrayIndexOutOfBoundsException_instance == NULL) {
     _ArrayIndexOutOfBoundsException_instance
           = get_or_create_exception(_ArrayIndexOutOfBoundsException_handle,
           vmSymbols::java_lang_ArrayIndexOutOfBoundsException());
   }
   return _ArrayIndexOutOfBoundsException_instance;
 }
 ciInstance* ciEnv::ArrayStoreException_instance() {
   if (_ArrayStoreException_instance == NULL) {
     _ArrayStoreException_instance
           = get_or_create_exception(_ArrayStoreException_handle,
           vmSymbols::java_lang_ArrayStoreException());
   }
   return _ArrayStoreException_instance;
 }
 ciInstance* ciEnv::ClassCastException_instance() {
   if (_ClassCastException_instance == NULL) {
     _ClassCastException_instance
           = get_or_create_exception(_ClassCastException_handle,
           vmSymbols::java_lang_ClassCastException());
   }
   return _ClassCastException_instance;
 }
 ciInstance* ciEnv::the_null_string() {
   if (_the_null_string == NULL) {
     VM_ENTRY_MARK;
     _the_null_string = get_object(Universe::the_null_string())->as_instance();
   }
   return _the_null_string;
 }
 ciInstance* ciEnv::the_min_jint_string() {
   if (_the_min_jint_string == NULL) {
     VM_ENTRY_MARK;
     _the_min_jint_string = get_object(Universe::the_min_jint_string())->as_instance();
   }
   return _the_min_jint_string;
 }
 // ------------------------------------------------------------------
 // ciEnv::get_method_from_handle
 ciMethod* ciEnv::get_method_from_handle(Method* method) {
   VM_ENTRY_MARK;
   return get_metadata(method)->as_method();
 }
 // ------------------------------------------------------------------
 // ciEnv::array_element_offset_in_bytes
 int ciEnv::array_element_offset_in_bytes(ciArray* a_h, ciObject* o_h) {
   VM_ENTRY_MARK;
   objArrayOop a = (objArrayOop)a_h->get_oop();
   assert(a->is_objArray(), "");
   int length = a->length();
   oop o = o_h->get_oop();
   for (int i = 0; i < length; i++) {
     if (a->obj_at(i) == o)  return i;
   }
   return -1;
 }
 // ------------------------------------------------------------------
 // ciEnv::check_klass_accessiblity
 //
 // Note: the logic of this method should mirror the logic of
 // ConstantPool::verify_constant_pool_resolve.
 bool ciEnv::check_klass_accessibility(ciKlass* accessing_klass,
                                       Klass* resolved_klass) {
   if (accessing_klass == NULL || !accessing_klass->is_loaded()) {
     return true;
   }
   if (accessing_klass->is_obj_array_klass()) {
     accessing_klass = accessing_klass->as_obj_array_klass()->base_element_klass();
   }
   if (!accessing_klass->is_instance_klass()) {
     return true;
   }
   if (resolved_klass->oop_is_objArray()) {
     // Find the element klass, if this is an array.
     resolved_klass = ObjArrayKlass::cast(resolved_klass)->bottom_klass();
   }
   if (resolved_klass->oop_is_instance()) {
     return Reflection::verify_class_access(accessing_klass->get_Klass(),
                                            resolved_klass,
                                            true);
   }
   return true;
 }
 // ------------------------------------------------------------------
 // ciEnv::get_klass_by_name_impl
 ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass,
                                        constantPoolHandle cpool,
                                        ciSymbol* name,
                                        bool require_local) {
   ASSERT_IN_VM;
   EXCEPTION_CONTEXT;
   // Now we need to check the SystemDictionary
   Symbol* sym = name->get_symbol();
   if (sym->byte_at(0) == 'L' &&
     sym->byte_at(sym->utf8_length()-1) == ';') {
     // This is a name from a signature.  Strip off the trimmings.
     // Call recursive to keep scope of strippedsym.
     TempNewSymbol strippedsym = SymbolTable::new_symbol(sym->as_utf8()+1,
                     sym->utf8_length()-2,
                     KILL_COMPILE_ON_FATAL_(_unloaded_ciinstance_klass));
     ciSymbol* strippedname = get_symbol(strippedsym);
     return get_klass_by_name_impl(accessing_klass, cpool, strippedname, require_local);
   }
   // Check for prior unloaded klass.  The SystemDictionary's answers
   // can vary over time but the compiler needs consistency.
   ciKlass* unloaded_klass = check_get_unloaded_klass(accessing_klass, name);
   if (unloaded_klass != NULL) {
     if (require_local)  return NULL;
     return unloaded_klass;
   }
   Handle loader(THREAD, (oop)NULL);
   Handle domain(THREAD, (oop)NULL);
   if (accessing_klass != NULL) {
     loader = Handle(THREAD, accessing_klass->loader());
     domain = Handle(THREAD, accessing_klass->protection_domain());
   }
   // setup up the proper type to return on OOM
   ciKlass* fail_type;
   if (sym->byte_at(0) == '[') {
     fail_type = _unloaded_ciobjarrayklass;
   } else {
     fail_type = _unloaded_ciinstance_klass;
   }
   KlassHandle found_klass;
   {
     ttyUnlocker ttyul;  // release tty lock to avoid ordering problems
     MutexLocker ml(Compile_lock);
     Klass* kls;
     if (!require_local) {
       kls = SystemDictionary::find_constrained_instance_or_array_klass(sym, loader,
                                                                        KILL_COMPILE_ON_FATAL_(fail_type));
     } else {
       kls = SystemDictionary::find_instance_or_array_klass(sym, loader, domain,
                                                            KILL_COMPILE_ON_FATAL_(fail_type));
     }
     found_klass = KlassHandle(THREAD, kls);
   }
   // If we fail to find an array klass, look again for its element type.
   // The element type may be available either locally or via constraints.
   // In either case, if we can find the element type in the system dictionary,
   // we must build an array type around it.  The CI requires array klasses
   // to be loaded if their element klasses are loaded, except when memory
   // is exhausted.
   if (sym->byte_at(0) == '[' &&
       (sym->byte_at(1) == '[' || sym->byte_at(1) == 'L')) {
     // We have an unloaded array.
     // Build it on the fly if the element class exists.
     TempNewSymbol elem_sym = SymbolTable::new_symbol(sym->as_utf8()+1,
                                                  sym->utf8_length()-1,
                                                  KILL_COMPILE_ON_FATAL_(fail_type));
     // Get element ciKlass recursively.
     ciKlass* elem_klass =
       get_klass_by_name_impl(accessing_klass,
                              cpool,
                              get_symbol(elem_sym),
                              require_local);
     if (elem_klass != NULL && elem_klass->is_loaded()) {
       // Now make an array for it
       return ciObjArrayKlass::make_impl(elem_klass);
     }
   }
   if (found_klass() == NULL && !cpool.is_null() && cpool->has_preresolution()) {
     // Look inside the constant pool for pre-resolved class entries.
     for (int i = cpool->length() - 1; i >= 1; i--) {
       if (cpool->tag_at(i).is_klass()) {
         Klass* kls = cpool->resolved_klass_at(i);
         if (kls->name() == sym) {
           found_klass = KlassHandle(THREAD, kls);
           break;
         }
       }
     }
   }
   if (found_klass() != NULL) {
     // Found it.  Build a CI handle.
     return get_klass(found_klass());
   }
   if (require_local)  return NULL;
   // Not yet loaded into the VM, or not governed by loader constraints.
   // Make a CI representative for it.
   return get_unloaded_klass(accessing_klass, name);
 }
 // ------------------------------------------------------------------
 // ciEnv::get_klass_by_name
 ciKlass* ciEnv::get_klass_by_name(ciKlass* accessing_klass,
                                   ciSymbol* klass_name,
                                   bool require_local) {
   GUARDED_VM_ENTRY(return get_klass_by_name_impl(accessing_klass,
                                                  constantPoolHandle(),
                                                  klass_name,
                                                  require_local);)
 }
 // ------------------------------------------------------------------
 // ciEnv::get_klass_by_index_impl
 //
 // Implementation of get_klass_by_index.
 ciKlass* ciEnv::get_klass_by_index_impl(constantPoolHandle cpool,
                                         int index,
                                         bool& is_accessible,
                                         ciInstanceKlass* accessor) {
   EXCEPTION_CONTEXT;
   KlassHandle klass; // = NULL;
   Symbol* klass_name = NULL;
   if (cpool->tag_at(index).is_symbol()) {
     klass_name = cpool->symbol_at(index);
   } else {
     // Check if it's resolved if it's not a symbol constant pool entry.
     klass = KlassHandle(THREAD, ConstantPool::klass_at_if_loaded(cpool, index));
   if (klass.is_null()) {
     // The klass has not been inserted into the constant pool.
     // Try to look it up by name.
     {
       // We have to lock the cpool to keep the oop from being resolved
       // while we are accessing it.
       oop cplock = cpool->lock();
       ObjectLocker ol(cplock, THREAD, cplock != NULL);
       constantTag tag = cpool->tag_at(index);
       if (tag.is_klass()) {
         // The klass has been inserted into the constant pool
         // very recently.
         klass = KlassHandle(THREAD, cpool->resolved_klass_at(index));
       } else {
         assert(cpool->tag_at(index).is_unresolved_klass(), "wrong tag");
         klass_name = cpool->unresolved_klass_at(index);
       }
     }
   }
   }
   if (klass.is_null()) {
     // Not found in constant pool.  Use the name to do the lookup.
     ciKlass* k = get_klass_by_name_impl(accessor,
                                         cpool,
                                         get_symbol(klass_name),
                                         false);
     // Calculate accessibility the hard way.
     if (!k->is_loaded()) {
       is_accessible = false;
     } else if (k->loader() != accessor->loader() &&
                get_klass_by_name_impl(accessor, cpool, k->name(), true) == NULL) {
       // Loaded only remotely.  Not linked yet.
       is_accessible = false;
     } else {
       // Linked locally, and we must also check public/private, etc.
       is_accessible = check_klass_accessibility(accessor, k->get_Klass());
     }
     return k;
   }
   // Check for prior unloaded klass.  The SystemDictionary's answers
   // can vary over time but the compiler needs consistency.
   ciSymbol* name = get_symbol(klass()->name());
   ciKlass* unloaded_klass = check_get_unloaded_klass(accessor, name);
   if (unloaded_klass != NULL) {
     is_accessible = false;
     return unloaded_klass;
   }
   // It is known to be accessible, since it was found in the constant pool.
   is_accessible = true;
   return get_klass(klass());
 }
 // ------------------------------------------------------------------
 // ciEnv::get_klass_by_index
 //
 // Get a klass from the constant pool.
 ciKlass* ciEnv::get_klass_by_index(constantPoolHandle cpool,
                                    int index,
                                    bool& is_accessible,
                                    ciInstanceKlass* accessor) {
   GUARDED_VM_ENTRY(return get_klass_by_index_impl(cpool, index, is_accessible, accessor);)
 }
 // ------------------------------------------------------------------
 // ciEnv::get_constant_by_index_impl
 //
 // Implementation of get_constant_by_index().
 ciConstant ciEnv::get_constant_by_index_impl(constantPoolHandle cpool,
                                              int pool_index, int cache_index,
                                              ciInstanceKlass* accessor) {
   bool ignore_will_link;
   EXCEPTION_CONTEXT;
   int index = pool_index;
   if (cache_index >= 0) {
     assert(index < 0, "only one kind of index at a time");
     oop obj = cpool->resolved_references()->obj_at(cache_index);
     if (obj != NULL) {
       ciObject* ciobj = get_object(obj);
       return ciConstant(T_OBJECT, ciobj);
     }
     index = cpool->object_to_cp_index(cache_index);
   }
   constantTag tag = cpool->tag_at(index);
   if (tag.is_int()) {
     return ciConstant(T_INT, (jint)cpool->int_at(index));
   } else if (tag.is_long()) {
     return ciConstant((jlong)cpool->long_at(index));
   } else if (tag.is_float()) {
     return ciConstant((jfloat)cpool->float_at(index));
   } else if (tag.is_double()) {
     return ciConstant((jdouble)cpool->double_at(index));
   } else if (tag.is_string()) {
     oop string = NULL;
     assert(cache_index >= 0, "should have a cache index");
     if (cpool->is_pseudo_string_at(index)) {
       string = cpool->pseudo_string_at(index, cache_index);
     } else {
       string = cpool->string_at(index, cache_index, THREAD);
       if (HAS_PENDING_EXCEPTION) {
         CLEAR_PENDING_EXCEPTION;
         record_out_of_memory_failure();
         return ciConstant();
       }
     }
     ciObject* constant = get_object(string);
     assert (constant->is_instance(), "must be an instance, or not? ");
     return ciConstant(T_OBJECT, constant);
   } else if (tag.is_klass() || tag.is_unresolved_klass()) {
     // 4881222: allow ldc to take a class type
     ciKlass* klass = get_klass_by_index_impl(cpool, index, ignore_will_link, accessor);
     if (HAS_PENDING_EXCEPTION) {
       CLEAR_PENDING_EXCEPTION;
       record_out_of_memory_failure();
       return ciConstant();
     }
     assert (klass->is_instance_klass() || klass->is_array_klass(),
             "must be an instance or array klass ");
     return ciConstant(T_OBJECT, klass->java_mirror());
   } else if (tag.is_method_type()) {
     // must execute Java code to link this CP entry into cache[i].f1
     ciSymbol* signature = get_symbol(cpool->method_type_signature_at(index));
     ciObject* ciobj = get_unloaded_method_type_constant(signature);
     return ciConstant(T_OBJECT, ciobj);
   } else if (tag.is_method_handle()) {
     // must execute Java code to link this CP entry into cache[i].f1
     int ref_kind        = cpool->method_handle_ref_kind_at(index);
     int callee_index    = cpool->method_handle_klass_index_at(index);
     ciKlass* callee     = get_klass_by_index_impl(cpool, callee_index, ignore_will_link, accessor);
     ciSymbol* name      = get_symbol(cpool->method_handle_name_ref_at(index));
     ciSymbol* signature = get_symbol(cpool->method_handle_signature_ref_at(index));
     ciObject* ciobj     = get_unloaded_method_handle_constant(callee, name, signature, ref_kind);
     return ciConstant(T_OBJECT, ciobj);
   } else {
     ShouldNotReachHere();
     return ciConstant();
   }
 }
 // ------------------------------------------------------------------
 // ciEnv::get_constant_by_index
 //
 // Pull a constant out of the constant pool.  How appropriate.
 //
 // Implementation note: this query is currently in no way cached.
 ciConstant ciEnv::get_constant_by_index(constantPoolHandle cpool,
                                         int pool_index, int cache_index,
                                         ciInstanceKlass* accessor) {
   GUARDED_VM_ENTRY(return get_constant_by_index_impl(cpool, pool_index, cache_index, accessor);)
 }
 // ------------------------------------------------------------------
 // ciEnv::get_field_by_index_impl
 //
 // Implementation of get_field_by_index.
 //
 // Implementation note: the results of field lookups are cached
 // in the accessor klass.
 ciField* ciEnv::get_field_by_index_impl(ciInstanceKlass* accessor,
                                         int index) {
   ciConstantPoolCache* cache = accessor->field_cache();
   if (cache == NULL) {
     ciField* field = new (arena()) ciField(accessor, index);
     return field;
   } else {
     ciField* field = (ciField*)cache->get(index);
     if (field == NULL) {
       field = new (arena()) ciField(accessor, index);
       cache->insert(index, field);
     }
     return field;
   }
 }
 // ------------------------------------------------------------------
 // ciEnv::get_field_by_index
 //
 // Get a field by index from a klass's constant pool.
 ciField* ciEnv::get_field_by_index(ciInstanceKlass* accessor,
                                    int index) {
   GUARDED_VM_ENTRY(return get_field_by_index_impl(accessor, index);)
 }
 // ------------------------------------------------------------------
 // ciEnv::lookup_method
 //
 // Perform an appropriate method lookup based on accessor, holder,
 // name, signature, and bytecode.
 Method* ciEnv::lookup_method(InstanceKlass*  accessor,
                                InstanceKlass*  holder,
                                Symbol*       name,
                                Symbol*       sig,
                                Bytecodes::Code bc) {
   EXCEPTION_CONTEXT;
   KlassHandle h_accessor(THREAD, accessor);
   KlassHandle h_holder(THREAD, holder);
   LinkResolver::check_klass_accessability(h_accessor, h_holder, KILL_COMPILE_ON_FATAL_(NULL));
   methodHandle dest_method;
   switch (bc) {
   case Bytecodes::_invokestatic:
     dest_method =
       LinkResolver::resolve_static_call_or_null(h_holder, name, sig, h_accessor);
     break;
   case Bytecodes::_invokespecial:
     dest_method =
       LinkResolver::resolve_special_call_or_null(h_holder, name, sig, h_accessor);
     break;
   case Bytecodes::_invokeinterface:
     dest_method =
       LinkResolver::linktime_resolve_interface_method_or_null(h_holder, name, sig,
                                                               h_accessor, true);
     break;
   case Bytecodes::_invokevirtual:
     dest_method =
       LinkResolver::linktime_resolve_virtual_method_or_null(h_holder, name, sig,
                                                             h_accessor, true);
     break;
   default: ShouldNotReachHere();
   }
   return dest_method();
 }
 // ------------------------------------------------------------------
 // ciEnv::get_method_by_index_impl
 ciMethod* ciEnv::get_method_by_index_impl(constantPoolHandle cpool,
                                           int index, Bytecodes::Code bc,
                                           ciInstanceKlass* accessor) {
   if (bc == Bytecodes::_invokedynamic) {
     ConstantPoolCacheEntry* cpce = cpool->invokedynamic_cp_cache_entry_at(index);
     bool is_resolved = !cpce->is_f1_null();
     // FIXME: code generation could allow for null (unlinked) call site
     // The call site could be made patchable as follows:
     // Load the appendix argument from the constant pool.
     // Test the appendix argument and jump to a known deopt routine if it is null.
     // Jump through a patchable call site, which is initially a deopt routine.
     // Patch the call site to the nmethod entry point of the static compiled lambda form.
     // As with other two-component call sites, both values must be independently verified.
     if (is_resolved) {
       // Get the invoker Method* from the constant pool.
       // (The appendix argument, if any, will be noted in the method's signature.)
       Method* adapter = cpce->f1_as_method();
       return get_method(adapter);
     }
     // Fake a method that is equivalent to a declared method.
     ciInstanceKlass* holder    = get_instance_klass(SystemDictionary::MethodHandle_klass());
     ciSymbol*        name      = ciSymbol::invokeBasic_name();
     ciSymbol*        signature = get_symbol(cpool->signature_ref_at(index));
     return get_unloaded_method(holder, name, signature, accessor);
   } else {
     const int holder_index = cpool->klass_ref_index_at(index);
     bool holder_is_accessible;
     ciKlass* holder = get_klass_by_index_impl(cpool, holder_index, holder_is_accessible, accessor);
     ciInstanceKlass* declared_holder = get_instance_klass_for_declared_method_holder(holder);
     // Get the method's name and signature.
     Symbol* name_sym = cpool->name_ref_at(index);
     Symbol* sig_sym  = cpool->signature_ref_at(index);
     if (cpool->has_preresolution()
         || (holder == ciEnv::MethodHandle_klass() &&
             MethodHandles::is_signature_polymorphic_name(holder->get_Klass(), name_sym))) {
       // Short-circuit lookups for JSR 292-related call sites.
       // That is, do not rely only on name-based lookups, because they may fail
       // if the names are not resolvable in the boot class loader (7056328).
       switch (bc) {
       case Bytecodes::_invokevirtual:
       case Bytecodes::_invokeinterface:
       case Bytecodes::_invokespecial:
       case Bytecodes::_invokestatic:
         {
           Method* m = ConstantPool::method_at_if_loaded(cpool, index);
           if (m != NULL) {
             return get_method(m);
           }
         }
         break;
       }
     }
     if (holder_is_accessible) {  // Our declared holder is loaded.
       InstanceKlass* lookup = declared_holder->get_instanceKlass();
       Method* m = lookup_method(accessor->get_instanceKlass(), lookup, name_sym, sig_sym, bc);
       if (m != NULL &&
           (bc == Bytecodes::_invokestatic
            ?  m->method_holder()->is_not_initialized()
            : !m->method_holder()->is_loaded())) {
         m = NULL;
       }
 #ifdef ASSERT
       if (m != NULL && ReplayCompiles && !ciReplay::is_loaded(m)) {
         m = NULL;
       }
 #endif
       if (m != NULL) {
         // We found the method.
         return get_method(m);
       }
     }
     // Either the declared holder was not loaded, or the method could
     // not be found.  Create a dummy ciMethod to represent the failed
     // lookup.
     ciSymbol* name      = get_symbol(name_sym);
     ciSymbol* signature = get_symbol(sig_sym);
     return get_unloaded_method(declared_holder, name, signature, accessor);
   }
 }
 // ------------------------------------------------------------------
 // ciEnv::get_instance_klass_for_declared_method_holder
 ciInstanceKlass* ciEnv::get_instance_klass_for_declared_method_holder(ciKlass* method_holder) {
   // For the case of <array>.clone(), the method holder can be a ciArrayKlass
   // instead of a ciInstanceKlass.  For that case simply pretend that the
   // declared holder is Object.clone since that's where the call will bottom out.
   // A more correct fix would trickle out through many interfaces in CI,
   // requiring ciInstanceKlass* to become ciKlass* and many more places would
   // require checks to make sure the expected type was found.  Given that this
   // only occurs for clone() the more extensive fix seems like overkill so
   // instead we simply smear the array type into Object.
   guarantee(method_holder != NULL, "no method holder");
   if (method_holder->is_instance_klass()) {
     return method_holder->as_instance_klass();
   } else if (method_holder->is_array_klass()) {
     return current()->Object_klass();
   } else {
     ShouldNotReachHere();
   }
   return NULL;
 }
 // ------------------------------------------------------------------
 // ciEnv::get_method_by_index
 ciMethod* ciEnv::get_method_by_index(constantPoolHandle cpool,
                                      int index, Bytecodes::Code bc,
                                      ciInstanceKlass* accessor) {
   GUARDED_VM_ENTRY(return get_method_by_index_impl(cpool, index, bc, accessor);)
 }
 // ------------------------------------------------------------------
 // ciEnv::name_buffer
 char *ciEnv::name_buffer(int req_len) {
   if (_name_buffer_len < req_len) {
     if (_name_buffer == NULL) {
       _name_buffer = (char*)arena()->Amalloc(sizeof(char)*req_len);
       _name_buffer_len = req_len;
     } else {
       _name_buffer =
         (char*)arena()->Arealloc(_name_buffer, _name_buffer_len, req_len);
       _name_buffer_len = req_len;
     }
   }
   return _name_buffer;
 }
 // ------------------------------------------------------------------
 // ciEnv::is_in_vm
 bool ciEnv::is_in_vm() {
   return JavaThread::current()->thread_state() == _thread_in_vm;
 }
 bool ciEnv::system_dictionary_modification_counter_changed() {
   return _system_dictionary_modification_counter != SystemDictionary::number_of_modifications();
 }
 // ------------------------------------------------------------------
 // ciEnv::validate_compile_task_dependencies
 //
 // Check for changes during compilation (e.g. class loads, evolution,
 // breakpoints, call site invalidation).
 void ciEnv::validate_compile_task_dependencies(ciMethod* target) {
   if (failing())  return;  // no need for further checks
   // First, check non-klass dependencies as we might return early and
   // not check klass dependencies if the system dictionary
   // modification counter hasn't changed (see below).
   for (Dependencies::DepStream deps(dependencies()); deps.next(); ) {
     if (deps.is_klass_type())  continue;  // skip klass dependencies
     Klass* witness = deps.check_dependency();
     if (witness != NULL) {
       record_failure("invalid non-klass dependency");
       return;
     }
   }
   // Klass dependencies must be checked when the system dictionary
   // changes.  If logging is enabled all violated dependences will be
   // recorded in the log.  In debug mode check dependencies even if
   // the system dictionary hasn't changed to verify that no invalid
   // dependencies were inserted.  Any violated dependences in this
   // case are dumped to the tty.
   bool counter_changed = system_dictionary_modification_counter_changed();
   bool verify_deps = trueInDebug;
   if (!counter_changed && !verify_deps)  return;
   int klass_violations = 0;
   for (Dependencies::DepStream deps(dependencies()); deps.next(); ) {
     if (!deps.is_klass_type())  continue;  // skip non-klass dependencies
     Klass* witness = deps.check_dependency();
     if (witness != NULL) {
       klass_violations++;
       if (!counter_changed) {
         // Dependence failed but counter didn't change.  Log a message
         // describing what failed and allow the assert at the end to
         // trigger.
         deps.print_dependency(witness);
       } else if (xtty == NULL) {
         // If we're not logging then a single violation is sufficient,
         // otherwise we want to log all the dependences which were
         // violated.
         break;
       }
     }
   }
   if (klass_violations != 0) {
 #ifdef ASSERT
     if (!counter_changed && !PrintCompilation) {
       // Print out the compile task that failed
       _task->print_line();
     }
 #endif
     assert(counter_changed, "failed dependencies, but counter didn't change");
     record_failure("concurrent class loading");
   }
 }
 // ------------------------------------------------------------------
 // ciEnv::register_method
 void ciEnv::register_method(ciMethod* target,
                             int entry_bci,
                             CodeOffsets* offsets,
                             int orig_pc_offset,
                             CodeBuffer* code_buffer,
                             int frame_words,
                             OopMapSet* oop_map_set,
                             ExceptionHandlerTable* handler_table,
                             ImplicitExceptionTable* inc_table,
                             AbstractCompiler* compiler,
                             int comp_level,
                             bool has_unsafe_access,
                             bool has_wide_vectors) {
   VM_ENTRY_MARK;
   nmethod* nm = NULL;
   {
     // To prevent compile queue updates.
     MutexLocker locker(MethodCompileQueue_lock, THREAD);
     // Prevent SystemDictionary::add_to_hierarchy from running
     // and invalidating our dependencies until we install this method.
     MutexLocker ml(Compile_lock);
     // Change in Jvmti state may invalidate compilation.
     if (!failing() &&
         ( (!jvmti_can_hotswap_or_post_breakpoint() &&
            JvmtiExport::can_hotswap_or_post_breakpoint()) ||
           (!jvmti_can_access_local_variables() &&
            JvmtiExport::can_access_local_variables()) ||
           (!jvmti_can_post_on_exceptions() &&
            JvmtiExport::can_post_on_exceptions()) )) {
       record_failure("Jvmti state change invalidated dependencies");
     }
     // Change in DTrace flags may invalidate compilation.
     if (!failing() &&
         ( (!dtrace_extended_probes() && ExtendedDTraceProbes) ||
           (!dtrace_method_probes() && DTraceMethodProbes) ||
           (!dtrace_alloc_probes() && DTraceAllocProbes) )) {
       record_failure("DTrace flags change invalidated dependencies");
     }
     if (!failing()) {
       if (log() != NULL) {
         // Log the dependencies which this compilation declares.
         dependencies()->log_all_dependencies();
       }
       // Encode the dependencies now, so we can check them right away.
       dependencies()->encode_content_bytes();
       // Check for {class loads, evolution, breakpoints, ...} during compilation
       validate_compile_task_dependencies(target);
     }
     methodHandle method(THREAD, target->get_Method());
     if (failing()) {
       // While not a true deoptimization, it is a preemptive decompile.
       MethodData* mdo = method()->method_data();
       if (mdo != NULL) {
         mdo->inc_decompile_count();
       }
       // All buffers in the CodeBuffer are allocated in the CodeCache.
       // If the code buffer is created on each compile attempt
       // as in C2, then it must be freed.
       code_buffer->free_blob();
       return;
     }
     assert(offsets->value(CodeOffsets::Deopt) != -1, "must have deopt entry");
     assert(offsets->value(CodeOffsets::Exceptions) != -1, "must have exception entry");
     nm =  nmethod::new_nmethod(method,
                                compile_id(),
                                entry_bci,
                                offsets,
                                orig_pc_offset,
                                debug_info(), dependencies(), code_buffer,
                                frame_words, oop_map_set,
                                handler_table, inc_table,
                                compiler, comp_level);
     // Free codeBlobs
     code_buffer->free_blob();
     // stress test 6243940 by immediately making the method
     // non-entrant behind the system's back. This has serious
     // side effects on the code cache and is not meant for
     // general stress testing
     if (nm != NULL && StressNonEntrant) {
       MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
       NativeJump::patch_verified_entry(nm->entry_point(), nm->verified_entry_point(),
                   SharedRuntime::get_handle_wrong_method_stub());
     }
     if (nm == NULL) {
       // The CodeCache is full.  Print out warning and disable compilation.
       record_failure("code cache is full");
       {
         MutexUnlocker ml(Compile_lock);
         MutexUnlocker locker(MethodCompileQueue_lock);
         CompileBroker::handle_full_code_cache();
       }
     } else {
       nm->set_has_unsafe_access(has_unsafe_access);
       nm->set_has_wide_vectors(has_wide_vectors);
       // Record successful registration.
       // (Put nm into the task handle *before* publishing to the Java heap.)
       if (task() != NULL)  task()->set_code(nm);
       if (entry_bci == InvocationEntryBci) {
         if (TieredCompilation) {
           // If there is an old version we're done with it
           nmethod* old = method->code();
           if (TraceMethodReplacement && old != NULL) {
             ResourceMark rm;
             char *method_name = method->name_and_sig_as_C_string();
             tty->print_cr("Replacing method %s", method_name);
           }
           if (old != NULL ) {
             old->make_not_entrant();
           }
         }
         if (TraceNMethodInstalls ) {
           ResourceMark rm;
           char *method_name = method->name_and_sig_as_C_string();
           ttyLocker ttyl;
           tty->print_cr("Installing method (%d) %s ",
                         comp_level,
                         method_name);
         }
         // Allow the code to be executed
         method->set_code(method, nm);
       } else {
         if (TraceNMethodInstalls ) {
           ResourceMark rm;
           char *method_name = method->name_and_sig_as_C_string();
           ttyLocker ttyl;
           tty->print_cr("Installing osr method (%d) %s @ %d",
                         comp_level,
                         method_name,
                         entry_bci);
         }
         method->method_holder()->add_osr_nmethod(nm);
       }
     }
   }
   // JVMTI -- compiled method notification (must be done outside lock)
   if (nm != NULL) {
     nm->post_compiled_method_load_event();
   }
 }
 // ------------------------------------------------------------------
 // ciEnv::find_system_klass
 ciKlass* ciEnv::find_system_klass(ciSymbol* klass_name) {
   VM_ENTRY_MARK;
   return get_klass_by_name_impl(NULL, constantPoolHandle(), klass_name, false);
 }
 // ------------------------------------------------------------------
 // ciEnv::comp_level
 int ciEnv::comp_level() {
   if (task() == NULL)  return CompLevel_highest_tier;
   return task()->comp_level();
 }
 // ------------------------------------------------------------------
 // ciEnv::compile_id
 uint ciEnv::compile_id() {
   if (task() == NULL)  return 0;
   return task()->compile_id();
 }
 // ------------------------------------------------------------------
 // ciEnv::notice_inlined_method()
 void ciEnv::notice_inlined_method(ciMethod* method) {
   _num_inlined_bytecodes += method->code_size_for_inlining();
 }
 // ------------------------------------------------------------------
 // ciEnv::num_inlined_bytecodes()
 int ciEnv::num_inlined_bytecodes() const {
   return _num_inlined_bytecodes;
 }
 // ------------------------------------------------------------------
 // ciEnv::record_failure()
 void ciEnv::record_failure(const char* reason) {
   if (log() != NULL) {
     log()->elem("failure reason='%s'", reason);
   }
   if (_failure_reason == NULL) {
     // Record the first failure reason.
     _failure_reason = reason;
   }
 }
 // ------------------------------------------------------------------
 // ciEnv::record_method_not_compilable()
 void ciEnv::record_method_not_compilable(const char* reason, bool all_tiers) {
   int new_compilable =
     all_tiers ? MethodCompilable_never : MethodCompilable_not_at_tier ;
   // Only note transitions to a worse state
   if (new_compilable > _compilable) {
     if (log() != NULL) {
       if (all_tiers) {
         log()->elem("method_not_compilable");
       } else {
         log()->elem("method_not_compilable_at_tier level='%d'",
                     current()->task()->comp_level());
       }
     }
     _compilable = new_compilable;
     // Reset failure reason; this one is more important.
     _failure_reason = NULL;
     record_failure(reason);
   }
 }
 // ------------------------------------------------------------------
 // ciEnv::record_out_of_memory_failure()
 void ciEnv::record_out_of_memory_failure() {
   // If memory is low, we stop compiling methods.
   record_method_not_compilable("out of memory");
 }
 ciInstance* ciEnv::unloaded_ciinstance() {
   GUARDED_VM_ENTRY(return _factory->get_unloaded_object_constant();)
 }
 // ------------------------------------------------------------------
 // ciEnv::dump_replay_data*
 // Don't change thread state and acquire any locks.
 // Safe to call from VM error reporter.
 void ciEnv::dump_replay_data_unsafe(outputStream* out) {
   ResourceMark rm;
 #if INCLUDE_JVMTI
   out->print_cr("JvmtiExport can_access_local_variables %d",     _jvmti_can_access_local_variables);
   out->print_cr("JvmtiExport can_hotswap_or_post_breakpoint %d", _jvmti_can_hotswap_or_post_breakpoint);
   out->print_cr("JvmtiExport can_post_on_exceptions %d",         _jvmti_can_post_on_exceptions);
 #endif // INCLUDE_JVMTI
   GrowableArray<ciMetadata*>* objects = _factory->get_ci_metadata();
   out->print_cr("# %d ciObject found", objects->length());
   for (int i = 0; i < objects->length(); i++) {
     objects->at(i)->dump_replay_data(out);
   }
   CompileTask* task = this->task();
   Method* method = task->method();
   int entry_bci = task->osr_bci();
   int comp_level = task->comp_level();
   // Klass holder = method->method_holder();
   out->print_cr("compile %s %s %s %d %d",
                 method->klass_name()->as_quoted_ascii(),
                 method->name()->as_quoted_ascii(),
                 method->signature()->as_quoted_ascii(),
                 entry_bci, comp_level);
   out->flush();
 }
 void ciEnv::dump_replay_data(outputStream* out) {
   GUARDED_VM_ENTRY(
     MutexLocker ml(Compile_lock);
     dump_replay_data_unsafe(out);
   )
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/ci/ciEnv.cpp@b2ee5dc63353 (annotated)

src/share/vm/ci/ciEnv.cpp