6785258: Update copyright year
Summary: Update copyright for files that have been modified starting July 2008 to Dec 2008
Reviewed-by: katleman, ohair, tbell
/*
* Copyright 1999-2008 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/_ciEnv.cpp.incl"
// ciEnv
//
// This class is the top level broker for requests from the compiler
// to the VM.
ciObject* ciEnv::_null_object_instance;
ciMethodKlass* ciEnv::_method_klass_instance;
ciSymbolKlass* ciEnv::_symbol_klass_instance;
ciKlassKlass* ciEnv::_klass_klass_instance;
ciInstanceKlassKlass* ciEnv::_instance_klass_klass_instance;
ciTypeArrayKlassKlass* ciEnv::_type_array_klass_klass_instance;
ciObjArrayKlassKlass* ciEnv::_obj_array_klass_klass_instance;
ciInstanceKlass* ciEnv::_ArrayStoreException;
ciInstanceKlass* ciEnv::_Class;
ciInstanceKlass* ciEnv::_ClassCastException;
ciInstanceKlass* ciEnv::_Object;
ciInstanceKlass* ciEnv::_Throwable;
ciInstanceKlass* ciEnv::_Thread;
ciInstanceKlass* ciEnv::_OutOfMemoryError;
ciInstanceKlass* ciEnv::_String;
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;
}
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");
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;
}
ciEnv::~ciEnv() {
CompilerThread* current_thread = CompilerThread::current();
current_thread->set_env(NULL);
}
// ------------------------------------------------------------------
// helper for lazy exception creation
ciInstance* ciEnv::get_or_create_exception(jobject& handle, symbolHandle name) {
VM_ENTRY_MARK;
if (handle == NULL) {
// Cf. universe.cpp, creation of Universe::_null_ptr_exception_instance.
klassOop k = SystemDictionary::find(name, Handle(), Handle(), THREAD);
jobject objh = NULL;
if (!HAS_PENDING_EXCEPTION && k != NULL) {
oop obj = instanceKlass::cast(k)->allocate_permanent_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();
}
// ------------------------------------------------------------------
// ciEnv::ArrayIndexOutOfBoundsException_instance, etc.
ciInstance* ciEnv::ArrayIndexOutOfBoundsException_instance() {
if (_ArrayIndexOutOfBoundsException_instance == NULL) {
_ArrayIndexOutOfBoundsException_instance
= get_or_create_exception(_ArrayIndexOutOfBoundsException_handle,
vmSymbolHandles::java_lang_ArrayIndexOutOfBoundsException());
}
return _ArrayIndexOutOfBoundsException_instance;
}
ciInstance* ciEnv::ArrayStoreException_instance() {
if (_ArrayStoreException_instance == NULL) {
_ArrayStoreException_instance
= get_or_create_exception(_ArrayStoreException_handle,
vmSymbolHandles::java_lang_ArrayStoreException());
}
return _ArrayStoreException_instance;
}
ciInstance* ciEnv::ClassCastException_instance() {
if (_ClassCastException_instance == NULL) {
_ClassCastException_instance
= get_or_create_exception(_ClassCastException_handle,
vmSymbolHandles::java_lang_ClassCastException());
}
return _ClassCastException_instance;
}
// ------------------------------------------------------------------
// ciEnv::get_method_from_handle
ciMethod* ciEnv::get_method_from_handle(jobject method) {
VM_ENTRY_MARK;
return get_object(JNIHandles::resolve(method))->as_method();
}
// ------------------------------------------------------------------
// ciEnv::make_array
ciArray* ciEnv::make_array(GrowableArray<ciObject*>* objects) {
VM_ENTRY_MARK;
int length = objects->length();
objArrayOop a = oopFactory::new_system_objArray(length, THREAD);
if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION;
record_out_of_memory_failure();
return NULL;
}
for (int i = 0; i < length; i++) {
a->obj_at_put(i, objects->at(i)->get_oop());
}
assert(a->is_perm(), "");
return get_object(a)->as_array();
}
// ------------------------------------------------------------------
// 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
// constantPoolOopDesc::verify_constant_pool_resolve.
bool ciEnv::check_klass_accessibility(ciKlass* accessing_klass,
klassOop resolved_klass) {
if (accessing_klass == NULL || !accessing_klass->is_loaded()) {
return true;
}
if (accessing_klass->is_obj_array()) {
accessing_klass = accessing_klass->as_obj_array_klass()->base_element_klass();
}
if (!accessing_klass->is_instance_klass()) {
return true;
}
if (resolved_klass->klass_part()->oop_is_objArray()) {
// Find the element klass, if this is an array.
resolved_klass = objArrayKlass::cast(resolved_klass)->bottom_klass();
}
if (resolved_klass->klass_part()->oop_is_instance()) {
return Reflection::verify_class_access(accessing_klass->get_klassOop(),
resolved_klass,
true);
}
return true;
}
// ------------------------------------------------------------------
// ciEnv::get_klass_by_name_impl
ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass,
ciSymbol* name,
bool require_local) {
ASSERT_IN_VM;
EXCEPTION_CONTEXT;
// Now we need to check the SystemDictionary
symbolHandle sym(THREAD, name->get_symbolOop());
if (sym->byte_at(0) == 'L' &&
sym->byte_at(sym->utf8_length()-1) == ';') {
// This is a name from a signature. Strip off the trimmings.
sym = oopFactory::new_symbol_handle(sym->as_utf8()+1,
sym->utf8_length()-2,
KILL_COMPILE_ON_FATAL_(_unloaded_ciinstance_klass));
name = get_object(sym())->as_symbol();
}
// 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;
}
klassOop found_klass;
if (!require_local) {
found_klass =
SystemDictionary::find_constrained_instance_or_array_klass(sym, loader,
KILL_COMPILE_ON_FATAL_(fail_type));
} else {
found_klass =
SystemDictionary::find_instance_or_array_klass(sym, loader, domain,
KILL_COMPILE_ON_FATAL_(fail_type));
}
if (found_klass != NULL) {
// Found it. Build a CI handle.
return get_object(found_klass)->as_klass();
}
// 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.
symbolOop elem_sym = oopFactory::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,
get_object(elem_sym)->as_symbol(),
require_local);
if (elem_klass != NULL && elem_klass->is_loaded()) {
// Now make an array for it
return ciObjArrayKlass::make_impl(elem_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,
klass_name,
require_local);)
}
// ------------------------------------------------------------------
// ciEnv::get_klass_by_index_impl
//
// Implementation of get_klass_by_index.
ciKlass* ciEnv::get_klass_by_index_impl(ciInstanceKlass* accessor,
int index,
bool& is_accessible) {
assert(accessor->get_instanceKlass()->is_linked(), "must be linked before accessing constant pool");
EXCEPTION_CONTEXT;
constantPoolHandle cpool(THREAD, accessor->get_instanceKlass()->constants());
KlassHandle klass (THREAD, constantPoolOopDesc::klass_at_if_loaded(cpool, index));
symbolHandle klass_name;
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.
ObjectLocker ol(cpool, THREAD);
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 if (tag.is_symbol()) {
klass_name = symbolHandle(THREAD, cpool->symbol_at(index));
} else {
assert(cpool->tag_at(index).is_unresolved_klass(), "wrong tag");
klass_name = symbolHandle(THREAD, 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,
get_object(klass_name())->as_symbol(),
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, 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_klassOop());
}
return k;
}
// Check for prior unloaded klass. The SystemDictionary's answers
// can vary over time but the compiler needs consistency.
ciSymbol* name = get_object(klass()->klass_part()->name())->as_symbol();
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_object(klass())->as_klass();
}
// ------------------------------------------------------------------
// ciEnv::get_klass_by_index
//
// Get a klass from the constant pool.
ciKlass* ciEnv::get_klass_by_index(ciInstanceKlass* accessor,
int index,
bool& is_accessible) {
GUARDED_VM_ENTRY(return get_klass_by_index_impl(accessor, index, is_accessible);)
}
// ------------------------------------------------------------------
// ciEnv::get_constant_by_index_impl
//
// Implementation of get_constant_by_index().
ciConstant ciEnv::get_constant_by_index_impl(ciInstanceKlass* accessor,
int index) {
EXCEPTION_CONTEXT;
instanceKlass* ik_accessor = accessor->get_instanceKlass();
assert(ik_accessor->is_linked(), "must be linked before accessing constant pool");
constantPoolOop cpool = ik_accessor->constants();
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() || tag.is_unresolved_string()) {
oop string = NULL;
if (cpool->is_pseudo_string_at(index)) {
string = cpool->pseudo_string_at(index);
} else {
string = cpool->string_at(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
bool ignore;
ciKlass* klass = get_klass_by_index_impl(accessor, index, ignore);
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);
} else {
ShouldNotReachHere();
return ciConstant();
}
}
// ------------------------------------------------------------------
// ciEnv::is_unresolved_string_impl
//
// Implementation of is_unresolved_string().
bool ciEnv::is_unresolved_string_impl(instanceKlass* accessor, int index) const {
EXCEPTION_CONTEXT;
assert(accessor->is_linked(), "must be linked before accessing constant pool");
constantPoolOop cpool = accessor->constants();
constantTag tag = cpool->tag_at(index);
return tag.is_unresolved_string();
}
// ------------------------------------------------------------------
// ciEnv::is_unresolved_klass_impl
//
// Implementation of is_unresolved_klass().
bool ciEnv::is_unresolved_klass_impl(instanceKlass* accessor, int index) const {
EXCEPTION_CONTEXT;
assert(accessor->is_linked(), "must be linked before accessing constant pool");
constantPoolOop cpool = accessor->constants();
constantTag tag = cpool->tag_at(index);
return tag.is_unresolved_klass();
}
// ------------------------------------------------------------------
// 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(ciInstanceKlass* accessor,
int index) {
GUARDED_VM_ENTRY(return get_constant_by_index_impl(accessor, index); )
}
// ------------------------------------------------------------------
// ciEnv::is_unresolved_string
//
// Check constant pool
//
// Implementation note: this query is currently in no way cached.
bool ciEnv::is_unresolved_string(ciInstanceKlass* accessor,
int index) const {
GUARDED_VM_ENTRY(return is_unresolved_string_impl(accessor->get_instanceKlass(), index); )
}
// ------------------------------------------------------------------
// ciEnv::is_unresolved_klass
//
// Check constant pool
//
// Implementation note: this query is currently in no way cached.
bool ciEnv::is_unresolved_klass(ciInstanceKlass* accessor,
int index) const {
GUARDED_VM_ENTRY(return is_unresolved_klass_impl(accessor->get_instanceKlass(), index); )
}
// ------------------------------------------------------------------
// 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.
methodOop ciEnv::lookup_method(instanceKlass* accessor,
instanceKlass* holder,
symbolOop name,
symbolOop sig,
Bytecodes::Code bc) {
EXCEPTION_CONTEXT;
KlassHandle h_accessor(THREAD, accessor);
KlassHandle h_holder(THREAD, holder);
symbolHandle h_name(THREAD, name);
symbolHandle h_sig(THREAD, sig);
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, h_name, h_sig, h_accessor);
break;
case Bytecodes::_invokespecial:
dest_method =
LinkResolver::resolve_special_call_or_null(h_holder, h_name, h_sig, h_accessor);
break;
case Bytecodes::_invokeinterface:
dest_method =
LinkResolver::linktime_resolve_interface_method_or_null(h_holder, h_name, h_sig,
h_accessor, true);
break;
case Bytecodes::_invokevirtual:
dest_method =
LinkResolver::linktime_resolve_virtual_method_or_null(h_holder, h_name, h_sig,
h_accessor, true);
break;
default: ShouldNotReachHere();
}
return dest_method();
}
// ------------------------------------------------------------------
// ciEnv::get_method_by_index_impl
ciMethod* ciEnv::get_method_by_index_impl(ciInstanceKlass* accessor,
int index, Bytecodes::Code bc) {
// Get the method's declared holder.
assert(accessor->get_instanceKlass()->is_linked(), "must be linked before accessing constant pool");
constantPoolHandle cpool = accessor->get_instanceKlass()->constants();
int holder_index = cpool->klass_ref_index_at(index);
bool holder_is_accessible;
ciKlass* holder = get_klass_by_index_impl(accessor, holder_index, holder_is_accessible);
ciInstanceKlass* declared_holder = get_instance_klass_for_declared_method_holder(holder);
// Get the method's name and signature.
int nt_index = cpool->name_and_type_ref_index_at(index);
int sig_index = cpool->signature_ref_index_at(nt_index);
symbolOop name_sym = cpool->name_ref_at(index);
symbolOop sig_sym = cpool->symbol_at(sig_index);
if (holder_is_accessible) { // Our declared holder is loaded.
instanceKlass* lookup = declared_holder->get_instanceKlass();
methodOop m = lookup_method(accessor->get_instanceKlass(), lookup, name_sym, sig_sym, bc);
if (m != NULL) {
// We found the method.
return get_object(m)->as_method();
}
}
// Either the declared holder was not loaded, or the method could
// not be found. Create a dummy ciMethod to represent the failed
// lookup.
return get_unloaded_method(declared_holder,
get_object(name_sym)->as_symbol(),
get_object(sig_sym)->as_symbol());
}
// ------------------------------------------------------------------
// 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.
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(ciInstanceKlass* accessor,
int index, Bytecodes::Code bc) {
GUARDED_VM_ENTRY(return get_method_by_index_impl(accessor, index, bc);)
}
// ------------------------------------------------------------------
// 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::check_for_system_dictionary_modification
// Check for changes to the system dictionary during compilation
// class loads, evolution, breakpoints
void ciEnv::check_for_system_dictionary_modification(ciMethod* target) {
if (failing()) return; // no need for further checks
// 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 test_deps = counter_changed;
DEBUG_ONLY(test_deps = true);
if (!test_deps) return;
bool print_failures = false;
DEBUG_ONLY(print_failures = !counter_changed);
bool keep_going = (print_failures || xtty != NULL);
int violated = 0;
for (Dependencies::DepStream deps(dependencies()); deps.next(); ) {
klassOop witness = deps.check_dependency();
if (witness != NULL) {
++violated;
if (print_failures) deps.print_dependency(witness, /*verbose=*/ true);
// If there's no log and we're not sanity-checking, we're done.
if (!keep_going) break;
}
}
if (violated != 0) {
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_debug_info,
bool has_unsafe_access) {
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);
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
check_for_system_dictionary_modification(target);
methodHandle method(THREAD, target->get_methodOop());
if (failing()) {
// While not a true deoptimization, it is a preemptive decompile.
methodDataOop 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");
UseInterpreter = true;
if (UseCompiler || AlwaysCompileLoopMethods ) {
#ifndef PRODUCT
warning("CodeCache is full. Compiler has been disabled");
if (CompileTheWorld || ExitOnFullCodeCache) {
before_exit(JavaThread::current());
exit_globals(); // will delete tty
vm_direct_exit(CompileTheWorld ? 0 : 1);
}
#endif
UseCompiler = false;
AlwaysCompileLoopMethods = false;
}
} else {
NOT_PRODUCT(nm->set_has_debug_info(has_debug_info); )
nm->set_has_unsafe_access(has_unsafe_access);
// 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) {
#ifdef TIERED
// 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();
}
#endif // TIERED
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);
}
instanceKlass::cast(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, klass_name, false);
}
// ------------------------------------------------------------------
// ciEnv::comp_level
int ciEnv::comp_level() {
if (task() == NULL) return CompLevel_full_optimization;
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();
}
// ------------------------------------------------------------------
// 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");
}
}
_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");
}