JDK14/Java14源码在线阅读
/*
* Copyright (c) 1999, 2019, 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 "jvm.h"
#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.inline.hpp"
#include "classfile/symbolTable.hpp"
#include "classfile/systemDictionary.hpp"
#include "classfile/vmSymbols.hpp"
#include "code/codeCache.hpp"
#include "code/scopeDesc.hpp"
#include "compiler/compileBroker.hpp"
#include "compiler/compileLog.hpp"
#include "compiler/disassembler.hpp"
#include "gc/shared/collectedHeap.inline.hpp"
#include "interpreter/linkResolver.hpp"
#include "jfr/jfrEvents.hpp"
#include "logging/log.hpp"
#include "memory/allocation.inline.hpp"
#include "memory/oopFactory.hpp"
#include "memory/resourceArea.hpp"
#include "memory/universe.hpp"
#include "oops/constantPool.inline.hpp"
#include "oops/cpCache.inline.hpp"
#include "oops/method.inline.hpp"
#include "oops/methodData.hpp"
#include "oops/objArrayKlass.hpp"
#include "oops/objArrayOop.inline.hpp"
#include "oops/oop.inline.hpp"
#include "prims/jvmtiExport.hpp"
#include "runtime/handles.inline.hpp"
#include "runtime/init.hpp"
#include "runtime/reflection.hpp"
#include "runtime/jniHandles.inline.hpp"
#include "runtime/safepointVerifiers.hpp"
#include "runtime/sharedRuntime.hpp"
#include "runtime/thread.inline.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) 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)
: _ciEnv_arena(mtCompiler) {
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;
_inc_decompile_count_on_failure = true;
_compilable = MethodCompilable;
_break_at_compile = false;
_compiler_data = NULL;
#ifndef PRODUCT
assert(!firstEnv, "not initialized properly");
#endif /* !PRODUCT */
_num_inlined_bytecodes = 0;
assert(task == NULL || thread->task() == task, "sanity");
if (task != NULL) {
task->mark_started(os::elapsed_counter());
}
_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;
_jvmti_redefinition_count = 0;
_jvmti_can_hotswap_or_post_breakpoint = false;
_jvmti_can_access_local_variables = false;
_jvmti_can_post_on_exceptions = false;
_jvmti_can_pop_frame = false;
}
ciEnv::ciEnv(Arena* arena) : _ciEnv_arena(mtCompiler) {
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;
_inc_decompile_count_on_failure = true;
_compilable = MethodCompilable_never;
_break_at_compile = false;
_compiler_data = NULL;
#ifndef PRODUCT
assert(firstEnv, "must be first");
firstEnv = false;
#endif /* !PRODUCT */
_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;
_jvmti_redefinition_count = 0;
_jvmti_can_hotswap_or_post_breakpoint = false;
_jvmti_can_access_local_variables = false;
_jvmti_can_post_on_exceptions = false;
_jvmti_can_pop_frame = false;
}
ciEnv::~ciEnv() {
GUARDED_VM_ENTRY(
CompilerThread* current_thread = CompilerThread::current();
_factory->remove_symbols();
// Need safepoint to clear the env on the thread. RedefineClasses might
// be reading it.
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_redefinition_count = JvmtiExport::redefinition_count();
_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();
_jvmti_can_pop_frame = JvmtiExport::can_pop_frame();
_jvmti_can_get_owned_monitor_info = JvmtiExport::can_get_owned_monitor_info();
}
bool ciEnv::jvmti_state_changed() const {
// Some classes were redefined
if (_jvmti_redefinition_count != JvmtiExport::redefinition_count()) {
return true;
}
if (!_jvmti_can_access_local_variables &&
JvmtiExport::can_access_local_variables()) {
return true;
}
if (!_jvmti_can_hotswap_or_post_breakpoint &&
JvmtiExport::can_hotswap_or_post_breakpoint()) {
return true;
}
if (!_jvmti_can_post_on_exceptions &&
JvmtiExport::can_post_on_exceptions()) {
return true;
}
if (!_jvmti_can_pop_frame &&
JvmtiExport::can_pop_frame()) {
return true;
}
if (!_jvmti_can_get_owned_monitor_info &&
JvmtiExport::can_get_owned_monitor_info()) {
return true;
}
return false;
}
// ------------------------------------------------------------------
// 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(Handle(THREAD, 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->is_objArray_klass()) {
// Find the element klass, if this is an array.
resolved_klass = ObjArrayKlass::cast(resolved_klass)->bottom_klass();
}
if (resolved_klass->is_instance_klass()) {
return (Reflection::verify_class_access(accessing_klass->get_Klass(),
InstanceKlass::cast(resolved_klass),
true) == Reflection::ACCESS_OK);
}
return true;
}
// ------------------------------------------------------------------
// ciEnv::get_klass_by_name_impl
ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass,
const 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->char_at(0) == JVM_SIGNATURE_CLASS &&
sym->char_at(sym->utf8_length()-1) == JVM_SIGNATURE_ENDCLASS) {
// 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);
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->char_at(0) == JVM_SIGNATURE_ARRAY) {
fail_type = _unloaded_ciobjarrayklass;
} else {
fail_type = _unloaded_ciinstance_klass;
}
Klass* 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 = 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->char_at(0) == JVM_SIGNATURE_ARRAY &&
(sym->char_at(1) == JVM_SIGNATURE_ARRAY || sym->char_at(1) == JVM_SIGNATURE_CLASS)) {
// 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);
// 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 = 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(const constantPoolHandle& cpool,
int index,
bool& is_accessible,
ciInstanceKlass* accessor) {
EXCEPTION_CONTEXT;
Klass* 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 = ConstantPool::klass_at_if_loaded(cpool, index);
// Try to look it up by name.
if (klass == NULL) {
klass_name = cpool->klass_name_at(index);
}
}
if (klass == 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(const 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(const 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");
index = cpool->object_to_cp_index(cache_index);
oop obj = cpool->resolved_references()->obj_at(cache_index);
if (obj != NULL) {
if (obj == Universe::the_null_sentinel()) {
return ciConstant(T_OBJECT, get_object(NULL));
}
BasicType bt = T_OBJECT;
if (cpool->tag_at(index).is_dynamic_constant())
bt = FieldType::basic_type(cpool->uncached_signature_ref_at(index));
if (is_reference_type(bt)) {
} else {
// we have to unbox the primitive value
if (!is_java_primitive(bt)) return ciConstant();
jvalue value;
BasicType bt2 = java_lang_boxing_object::get_value(obj, &value);
assert(bt2 == bt, "");
switch (bt2) {
case T_DOUBLE: return ciConstant(value.d);
case T_FLOAT: return ciConstant(value.f);
case T_LONG: return ciConstant(value.j);
case T_INT: return ciConstant(bt2, value.i);
case T_SHORT: return ciConstant(bt2, value.s);
case T_BYTE: return ciConstant(bt2, value.b);
case T_CHAR: return ciConstant(bt2, value.c);
case T_BOOLEAN: return ciConstant(bt2, value.z);
default: return ciConstant();
}
}
ciObject* ciobj = get_object(obj);
if (ciobj->is_array()) {
return ciConstant(T_ARRAY, ciobj);
} else {
assert(ciobj->is_instance(), "should be an instance");
return ciConstant(T_OBJECT, ciobj);
}
}
}
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);
if (constant->is_array()) {
return ciConstant(T_ARRAY, constant);
} else {
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 if (tag.is_dynamic_constant()) {
return ciConstant();
} 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(const 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(ciInstanceKlass* accessor,
ciKlass* holder,
Symbol* name,
Symbol* sig,
Bytecodes::Code bc,
constantTag tag) {
// Accessibility checks are performed in ciEnv::get_method_by_index_impl.
assert(check_klass_accessibility(accessor, holder->get_Klass()), "holder not accessible");
InstanceKlass* accessor_klass = accessor->get_instanceKlass();
Klass* holder_klass = holder->get_Klass();
Method* dest_method;
LinkInfo link_info(holder_klass, name, sig, accessor_klass, LinkInfo::needs_access_check, tag);
switch (bc) {
case Bytecodes::_invokestatic:
dest_method =
LinkResolver::resolve_static_call_or_null(link_info);
break;
case Bytecodes::_invokespecial:
dest_method =
LinkResolver::resolve_special_call_or_null(link_info);
break;
case Bytecodes::_invokeinterface:
dest_method =
LinkResolver::linktime_resolve_interface_method_or_null(link_info);
break;
case Bytecodes::_invokevirtual:
dest_method =
LinkResolver::linktime_resolve_virtual_method_or_null(link_info);
break;
default: ShouldNotReachHere();
}
return dest_method;
}
// ------------------------------------------------------------------
// ciEnv::get_method_by_index_impl
ciMethod* ciEnv::get_method_by_index_impl(const 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);
// 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() || holder == ciEnv::VarHandle_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;
default:
break;
}
}
if (holder_is_accessible) { // Our declared holder is loaded.
constantTag tag = cpool->tag_ref_at(index);
assert(accessor->get_instanceKlass() == cpool->pool_holder(), "not the pool holder?");
Method* m = lookup_method(accessor, holder, name_sym, sig_sym, bc, tag);
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(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(const 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;
}
// ------------------------------------------------------------------
// 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
Dependencies::DepType result = dependencies()->validate_dependencies(_task);
if (result != Dependencies::end_marker) {
if (result == Dependencies::call_site_target_value) {
_inc_decompile_count_on_failure = false;
record_failure("call site target change");
} else if (Dependencies::is_klass_type(result)) {
record_failure("concurrent class loading");
} else {
record_failure("invalid non-klass dependency");
}
}
}
// ------------------------------------------------------------------
// 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,
bool has_unsafe_access,
bool has_wide_vectors,
RTMState rtm_state) {
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.
// No safepoints are allowed. Otherwise, class redefinition can occur in between.
MutexLocker ml(Compile_lock);
NoSafepointVerifier nsv;
// Change in Jvmti state may invalidate compilation.
if (!failing() && jvmti_state_changed()) {
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() && target->needs_clinit_barrier() &&
target->holder()->is_in_error_state()) {
record_failure("method holder is in error state");
}
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 INCLUDE_RTM_OPT
if (!failing() && (rtm_state != NoRTM) &&
(method()->method_data() != NULL) &&
(method()->method_data()->rtm_state() != rtm_state)) {
// Preemptive decompile if rtm state was changed.
record_failure("RTM state change invalidated rtm code");
}
#endif
if (failing()) {
// While not a true deoptimization, it is a preemptive decompile.
MethodData* mdo = method()->method_data();
if (mdo != NULL && _inc_decompile_count_on_failure) {
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, task()->comp_level());
// Free codeBlobs
code_buffer->free_blob();
if (nm != NULL) {
nm->set_has_unsafe_access(has_unsafe_access);
nm->set_has_wide_vectors(has_wide_vectors);
#if INCLUDE_RTM_OPT
nm->set_rtm_state(rtm_state);
#endif
// 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
CompiledMethod* 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_used();
}
}
LogTarget(Info, nmethod, install) lt;
if (lt.is_enabled()) {
ResourceMark rm;
char *method_name = method->name_and_sig_as_C_string();
lt.print("Installing method (%d) %s ",
task()->comp_level(), method_name);
}
// Allow the code to be executed
MutexLocker ml(CompiledMethod_lock, Mutex::_no_safepoint_check_flag);
if (nm->make_in_use()) {
method->set_code(method, nm);
}
} else {
LogTarget(Info, nmethod, install) lt;
if (lt.is_enabled()) {
ResourceMark rm;
char *method_name = method->name_and_sig_as_C_string();
lt.print("Installing osr method (%d) %s @ %d",
task()->comp_level(), method_name, entry_bci);
}
MutexLocker ml(CompiledMethod_lock, Mutex::_no_safepoint_check_flag);
if (nm->make_in_use()) {
method->method_holder()->add_osr_nmethod(nm);
}
}
}
} // safepoints are allowed again
if (nm != NULL) {
// JVMTI -- compiled method notification (must be done outside lock)
nm->post_compiled_method_load_event();
} else {
// The CodeCache is full.
record_failure("code cache is full");
}
}
// ------------------------------------------------------------------
// 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 (_failure_reason == NULL) {
// Record the first failure reason.
_failure_reason = reason;
}
}
/**代码未完, 请加载全部代码(NowJava.com).**/
关注时代Java
关注时代Java