Java example source code file (methodHandles.cpp)
The methodHandles.cpp Java example source code
/*
* Copyright (c) 2008, 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 "classfile/symbolTable.hpp"
#include "compiler/compileBroker.hpp"
#include "interpreter/interpreter.hpp"
#include "interpreter/oopMapCache.hpp"
#include "memory/allocation.inline.hpp"
#include "memory/oopFactory.hpp"
#include "prims/jvmtiRedefineClassesTrace.hpp"
#include "prims/methodHandles.hpp"
#include "runtime/compilationPolicy.hpp"
#include "runtime/javaCalls.hpp"
#include "runtime/reflection.hpp"
#include "runtime/signature.hpp"
#include "runtime/stubRoutines.hpp"
/*
* JSR 292 reference implementation: method handles
* The JDK 7 reference implementation represented method handle
* combinations as chains. Each link in the chain had a "vmentry"
* field which pointed at a bit of assembly code which performed
* one transformation before dispatching to the next link in the chain.
*
* The current reference implementation pushes almost all code generation
* responsibility to (trusted) Java code. A method handle contains a
* pointer to its "LambdaForm", which embodies all details of the method
* handle's behavior. The LambdaForm is a normal Java object, managed
* by a runtime coded in Java.
*/
bool MethodHandles::_enabled = false; // set true after successful native linkage
MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL;
//------------------------------------------------------------------------------
// MethodHandles::generate_adapters
//
void MethodHandles::generate_adapters() {
if (!EnableInvokeDynamic || SystemDictionary::MethodHandle_klass() == NULL) return;
assert(_adapter_code == NULL, "generate only once");
ResourceMark rm;
TraceTime timer("MethodHandles adapters generation", TraceStartupTime);
_adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size);
if (_adapter_code == NULL)
vm_exit_out_of_memory(adapter_code_size, OOM_MALLOC_ERROR,
"CodeCache: no room for MethodHandles adapters");
{
CodeBuffer code(_adapter_code);
MethodHandlesAdapterGenerator g(&code);
g.generate();
code.log_section_sizes("MethodHandlesAdapterBlob");
}
}
//------------------------------------------------------------------------------
// MethodHandlesAdapterGenerator::generate
//
void MethodHandlesAdapterGenerator::generate() {
// Generate generic method handle adapters.
// Generate interpreter entries
for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST;
mk <= Interpreter::method_handle_invoke_LAST;
mk = Interpreter::MethodKind(1 + (int)mk)) {
vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk);
StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid));
address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid);
if (entry != NULL) {
Interpreter::set_entry_for_kind(mk, entry);
}
// If the entry is not set, it will throw AbstractMethodError.
}
}
void MethodHandles::set_enabled(bool z) {
if (_enabled != z) {
guarantee(z && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic");
_enabled = z;
}
}
// MemberName support
// import java_lang_invoke_MemberName.*
enum {
IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD,
IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR,
IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD,
IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE,
CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE,
REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT,
REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,
SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES,
SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES,
ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE
};
Handle MethodHandles::new_MemberName(TRAPS) {
Handle empty;
instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass());
if (!k->is_initialized()) k->initialize(CHECK_(empty));
return Handle(THREAD, k->allocate_instance(THREAD));
}
oop MethodHandles::init_MemberName(Handle mname, Handle target) {
// This method is used from java.lang.invoke.MemberName constructors.
// It fills in the new MemberName from a java.lang.reflect.Member.
Thread* thread = Thread::current();
oop target_oop = target();
Klass* target_klass = target_oop->klass();
if (target_klass == SystemDictionary::reflect_Field_klass()) {
oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder()
int slot = java_lang_reflect_Field::slot(target_oop); // fd.index()
KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
if (!k.is_null() && k->oop_is_instance()) {
fieldDescriptor fd(InstanceKlass::cast(k()), slot);
oop mname2 = init_field_MemberName(mname, fd);
if (mname2 != NULL) {
// Since we have the reified name and type handy, add them to the result.
if (java_lang_invoke_MemberName::name(mname2) == NULL)
java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop));
if (java_lang_invoke_MemberName::type(mname2) == NULL)
java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop));
}
return mname2;
}
} else if (target_klass == SystemDictionary::reflect_Method_klass()) {
oop clazz = java_lang_reflect_Method::clazz(target_oop);
int slot = java_lang_reflect_Method::slot(target_oop);
KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
if (!k.is_null() && k->oop_is_instance()) {
Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
if (m == NULL || is_signature_polymorphic(m->intrinsic_id()))
return NULL; // do not resolve unless there is a concrete signature
CallInfo info(m, k());
return init_method_MemberName(mname, info);
}
} else if (target_klass == SystemDictionary::reflect_Constructor_klass()) {
oop clazz = java_lang_reflect_Constructor::clazz(target_oop);
int slot = java_lang_reflect_Constructor::slot(target_oop);
KlassHandle k(thread, java_lang_Class::as_Klass(clazz));
if (!k.is_null() && k->oop_is_instance()) {
Method* m = InstanceKlass::cast(k())->method_with_idnum(slot);
if (m == NULL) return NULL;
CallInfo info(m, k());
return init_method_MemberName(mname, info);
}
}
return NULL;
}
oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) {
assert(info.resolved_appendix().is_null(), "only normal methods here");
methodHandle m = info.resolved_method();
KlassHandle m_klass = m->method_holder();
int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS );
int vmindex = Method::invalid_vtable_index;
switch (info.call_kind()) {
case CallInfo::itable_call:
vmindex = info.itable_index();
// More importantly, the itable index only works with the method holder.
assert(m_klass->verify_itable_index(vmindex), "");
flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT);
if (TraceInvokeDynamic) {
ResourceMark rm;
tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:",
Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
vmindex);
m->access_flags().print_on(tty);
if (!m->is_abstract()) {
tty->print("default");
}
tty->cr();
}
break;
case CallInfo::vtable_call:
vmindex = info.vtable_index();
flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT);
assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe");
if (m_klass->is_interface()) {
// This is a vtable call to an interface method (abstract "miranda method" or default method).
// The vtable index is meaningless without a class (not interface) receiver type, so get one.
// (LinkResolver should help us figure this out.)
KlassHandle m_klass_non_interface = info.resolved_klass();
if (m_klass_non_interface->is_interface()) {
m_klass_non_interface = SystemDictionary::Object_klass();
#ifdef ASSERT
{ ResourceMark rm;
Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex);
assert(m->name() == m2->name() && m->signature() == m2->signature(),
err_msg("at %d, %s != %s", vmindex,
m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()));
}
#endif //ASSERT
}
if (!m->is_public()) {
assert(m->is_public(), "virtual call must be to public interface method");
return NULL; // elicit an error later in product build
}
assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe");
m_klass = m_klass_non_interface;
}
if (TraceInvokeDynamic) {
ResourceMark rm;
tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:",
Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()),
m_klass->internal_name(), vmindex);
m->access_flags().print_on(tty);
if (m->is_default_method()) {
tty->print("default");
}
tty->cr();
}
break;
case CallInfo::direct_call:
vmindex = Method::nonvirtual_vtable_index;
if (m->is_static()) {
flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT);
} else if (m->is_initializer()) {
flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
} else {
flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT);
}
break;
default: assert(false, "bad CallInfo"); return NULL;
}
// @CallerSensitive annotation detected
if (m->caller_sensitive()) {
flags |= CALLER_SENSITIVE;
}
oop mname_oop = mname();
java_lang_invoke_MemberName::set_flags( mname_oop, flags);
java_lang_invoke_MemberName::set_vmtarget(mname_oop, m());
java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index
java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror());
// Note: name and type can be lazily computed by resolve_MemberName,
// if Java code needs them as resolved String and MethodType objects.
// The clazz must be eagerly stored, because it provides a GC
// root to help keep alive the Method*.
// If relevant, the vtable or itable value is stored as vmindex.
// This is done eagerly, since it is readily available without
// constructing any new objects.
// TO DO: maybe intern mname_oop
m->method_holder()->add_member_name(m->method_idnum(), mname);
return mname();
}
oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) {
int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS );
flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT);
if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT);
Metadata* vmtarget = fd.field_holder();
int vmindex = fd.offset(); // determines the field uniquely when combined with static bit
oop mname_oop = mname();
java_lang_invoke_MemberName::set_flags(mname_oop, flags);
java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget);
java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex);
java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror());
oop type = field_signature_type_or_null(fd.signature());
oop name = field_name_or_null(fd.name());
if (name != NULL)
java_lang_invoke_MemberName::set_name(mname_oop, name);
if (type != NULL)
java_lang_invoke_MemberName::set_type(mname_oop, type);
// Note: name and type can be lazily computed by resolve_MemberName,
// if Java code needs them as resolved String and Class objects.
// Note that the incoming type oop might be pre-resolved (non-null).
// The base clazz and field offset (vmindex) must be eagerly stored,
// because they unambiguously identify the field.
// Although the fieldDescriptor::_index would also identify the field,
// we do not use it, because it is harder to decode.
// TO DO: maybe intern mname_oop
return mname();
}
// JVM 2.9 Special Methods:
// A method is signature polymorphic if and only if all of the following conditions hold :
// * It is declared in the java.lang.invoke.MethodHandle class.
// * It has a single formal parameter of type Object[].
// * It has a return type of Object.
// * It has the ACC_VARARGS and ACC_NATIVE flags set.
bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) {
if (klass == NULL)
return false;
// The following test will fail spuriously during bootstrap of MethodHandle itself:
// if (klass != SystemDictionary::MethodHandle_klass())
// Test the name instead:
if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle())
return false;
Symbol* poly_sig = vmSymbols::object_array_object_signature();
Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig);
if (m == NULL) return false;
int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS;
int flags = m->access_flags().as_int();
return (flags & required) == required;
}
Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) {
assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid));
switch (iid) {
case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name();
case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name();
case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name();
case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name();
case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name();
}
assert(false, "");
return 0;
}
int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) {
switch (iid) {
case vmIntrinsics::_invokeBasic: return 0;
case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual;
case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic;
case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial;
case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface;
}
assert(false, err_msg("iid=%d", iid));
return 0;
}
vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) {
vmSymbols::SID name_id = vmSymbols::find_sid(name);
switch (name_id) {
// The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins.
case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric;
// The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic:
case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic;
// There is one static signature-polymorphic method for each JVM invocation mode.
case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual;
case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic;
case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial;
case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface;
}
// Cover the case of invokeExact and any future variants of invokeFoo.
Klass* mh_klass = SystemDictionary::well_known_klass(
SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) );
if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name))
return vmIntrinsics::_invokeGeneric;
// Note: The pseudo-intrinsic _compiledLambdaForm is never linked against.
// Instead it is used to mark lambda forms bound to invokehandle or invokedynamic.
return vmIntrinsics::_none;
}
vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) {
if (klass != NULL &&
klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) {
vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
if (iid != vmIntrinsics::_none)
return iid;
if (is_method_handle_invoke_name(klass, name))
return vmIntrinsics::_invokeGeneric;
}
return vmIntrinsics::_none;
}
// convert the external string or reflective type to an internal signature
Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) {
if (java_lang_invoke_MethodType::is_instance(type_str)) {
return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, CHECK_NULL);
} else if (java_lang_Class::is_instance(type_str)) {
return java_lang_Class::as_signature(type_str, false, CHECK_NULL);
} else if (java_lang_String::is_instance(type_str)) {
if (intern_if_not_found) {
return java_lang_String::as_symbol(type_str, CHECK_NULL);
} else {
return java_lang_String::as_symbol_or_null(type_str);
}
} else {
THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL);
}
}
static const char OBJ_SIG[] = "Ljava/lang/Object;";
enum { OBJ_SIG_LEN = 18 };
bool MethodHandles::is_basic_type_signature(Symbol* sig) {
assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, "");
assert(vmSymbols::object_signature()->equals(OBJ_SIG), "");
const int len = sig->utf8_length();
for (int i = 0; i < len; i++) {
switch (sig->byte_at(i)) {
case 'L':
// only java/lang/Object is valid here
if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i)
return false;
i += OBJ_SIG_LEN-1; //-1 because of i++ in loop
continue;
case '(': case ')': case 'V':
case 'I': case 'J': case 'F': case 'D':
continue;
//case '[':
//case 'Z': case 'B': case 'C': case 'S':
default:
return false;
}
}
return true;
}
Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) {
Symbol* bsig = NULL;
if (sig == NULL) {
return sig;
} else if (is_basic_type_signature(sig)) {
sig->increment_refcount();
return sig; // that was easy
} else if (sig->byte_at(0) != '(') {
BasicType bt = char2type(sig->byte_at(0));
if (is_subword_type(bt)) {
bsig = vmSymbols::int_signature();
} else {
assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false");
bsig = vmSymbols::object_signature();
}
} else {
ResourceMark rm;
stringStream buffer(128);
buffer.put('(');
int arg_pos = 0, keep_arg_pos = -1;
if (keep_last_arg)
keep_arg_pos = ArgumentCount(sig).size() - 1;
for (SignatureStream ss(sig); !ss.is_done(); ss.next()) {
BasicType bt = ss.type();
size_t this_arg_pos = buffer.size();
if (ss.at_return_type()) {
buffer.put(')');
}
if (arg_pos == keep_arg_pos) {
buffer.write((char*) ss.raw_bytes(),
(int) ss.raw_length());
} else if (bt == T_OBJECT || bt == T_ARRAY) {
buffer.write(OBJ_SIG, OBJ_SIG_LEN);
} else {
if (is_subword_type(bt))
bt = T_INT;
buffer.put(type2char(bt));
}
arg_pos++;
}
const char* sigstr = buffer.base();
int siglen = (int) buffer.size();
bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD);
}
assert(is_basic_type_signature(bsig) ||
// detune assert in case the injected argument is not a basic type:
keep_last_arg, "");
return bsig;
}
void MethodHandles::print_as_basic_type_signature_on(outputStream* st,
Symbol* sig,
bool keep_arrays,
bool keep_basic_names) {
st = st ? st : tty;
int len = sig->utf8_length();
int array = 0;
bool prev_type = false;
for (int i = 0; i < len; i++) {
char ch = sig->byte_at(i);
switch (ch) {
case '(': case ')':
prev_type = false;
st->put(ch);
continue;
case '[':
if (!keep_basic_names && keep_arrays)
st->put(ch);
array++;
continue;
case 'L':
{
if (prev_type) st->put(',');
int start = i+1, slash = start;
while (++i < len && (ch = sig->byte_at(i)) != ';') {
if (ch == '/' || ch == '.' || ch == '$') slash = i+1;
}
if (slash < i) start = slash;
if (!keep_basic_names) {
st->put('L');
} else {
for (int j = start; j < i; j++)
st->put(sig->byte_at(j));
prev_type = true;
}
break;
}
default:
{
if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) {
ch = '[';
array = 0;
}
if (prev_type) st->put(',');
const char* n = NULL;
if (keep_basic_names)
n = type2name(char2type(ch));
if (n == NULL) {
// unknown letter, or we don't want to know its name
st->put(ch);
} else {
st->print(n);
prev_type = true;
}
break;
}
}
// Switch break goes here to take care of array suffix:
if (prev_type) {
while (array > 0) {
st->print("[]");
--array;
}
}
array = 0;
}
}
static oop object_java_mirror() {
return SystemDictionary::Object_klass()->java_mirror();
}
oop MethodHandles::field_name_or_null(Symbol* s) {
if (s == NULL) return NULL;
return StringTable::lookup(s);
}
oop MethodHandles::field_signature_type_or_null(Symbol* s) {
if (s == NULL) return NULL;
BasicType bt = FieldType::basic_type(s);
if (is_java_primitive(bt)) {
assert(s->utf8_length() == 1, "");
return java_lang_Class::primitive_mirror(bt);
}
// Here are some more short cuts for common types.
// They are optional, since reference types can be resolved lazily.
if (bt == T_OBJECT) {
if (s == vmSymbols::object_signature()) {
return object_java_mirror();
} else if (s == vmSymbols::class_signature()) {
return SystemDictionary::Class_klass()->java_mirror();
} else if (s == vmSymbols::string_signature()) {
return SystemDictionary::String_klass()->java_mirror();
}
}
return NULL;
}
// An unresolved member name is a mere symbolic reference.
// Resolving it plants a vmtarget/vmindex in it,
// which refers directly to JVM internals.
Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) {
Handle empty;
assert(java_lang_invoke_MemberName::is_instance(mname()), "");
if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) {
// Already resolved.
DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname()));
assert(vmindex >= Method::nonvirtual_vtable_index, "");
return mname;
}
Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname()));
Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname()));
Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname()));
int flags = java_lang_invoke_MemberName::flags(mname());
int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
if (!ref_kind_is_valid(ref_kind)) {
THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty);
}
DEBUG_ONLY(int old_vmindex);
assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input");
if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) {
THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty);
}
instanceKlassHandle defc;
{
Klass* defc_klass = java_lang_Class::as_Klass(defc_oop());
if (defc_klass == NULL) return empty; // a primitive; no resolution possible
if (!defc_klass->oop_is_instance()) {
if (!defc_klass->oop_is_array()) return empty;
defc_klass = SystemDictionary::Object_klass();
}
defc = instanceKlassHandle(THREAD, defc_klass);
}
if (defc.is_null()) {
THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty);
}
defc->link_class(CHECK_(empty)); // possible safepoint
// convert the external string name to an internal symbol
TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str());
if (name == NULL) return empty; // no such name
if (name == vmSymbols::class_initializer_name())
return empty; // illegal name
vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none;
if ((flags & ALL_KINDS) == IS_METHOD &&
(defc() == SystemDictionary::MethodHandle_klass()) &&
(ref_kind == JVM_REF_invokeVirtual ||
ref_kind == JVM_REF_invokeSpecial ||
// static invocation mode is required for _linkToVirtual, etc.:
ref_kind == JVM_REF_invokeStatic)) {
vmIntrinsics::ID iid = signature_polymorphic_name_id(name);
if (iid != vmIntrinsics::_none &&
((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) {
// Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic.
// For a static reference it could an internal linkage routine like _linkToVirtual, etc.
mh_invoke_id = iid;
}
}
// convert the external string or reflective type to an internal signature
TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty));
if (type == NULL) return empty; // no such signature exists in the VM
// Time to do the lookup.
switch (flags & ALL_KINDS) {
case IS_METHOD:
{
CallInfo result;
{
assert(!HAS_PENDING_EXCEPTION, "");
if (ref_kind == JVM_REF_invokeStatic) {
LinkResolver::resolve_static_call(result,
defc, name, type, caller, caller.not_null(), false, THREAD);
} else if (ref_kind == JVM_REF_invokeInterface) {
LinkResolver::resolve_interface_call(result, Handle(), defc,
defc, name, type, caller, caller.not_null(), false, THREAD);
} else if (mh_invoke_id != vmIntrinsics::_none) {
assert(!is_signature_polymorphic_static(mh_invoke_id), "");
LinkResolver::resolve_handle_call(result,
defc, name, type, caller, THREAD);
} else if (ref_kind == JVM_REF_invokeSpecial) {
LinkResolver::resolve_special_call(result,
defc, name, type, caller, caller.not_null(), THREAD);
} else if (ref_kind == JVM_REF_invokeVirtual) {
LinkResolver::resolve_virtual_call(result, Handle(), defc,
defc, name, type, caller, caller.not_null(), false, THREAD);
} else {
assert(false, err_msg("ref_kind=%d", ref_kind));
}
if (HAS_PENDING_EXCEPTION) {
return empty;
}
}
if (result.resolved_appendix().not_null()) {
// The resolved MemberName must not be accompanied by an appendix argument,
// since there is no way to bind this value into the MemberName.
// Caller is responsible to prevent this from happening.
THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty);
}
oop mname2 = init_method_MemberName(mname, result);
return Handle(THREAD, mname2);
}
case IS_CONSTRUCTOR:
{
CallInfo result;
{
assert(!HAS_PENDING_EXCEPTION, "");
if (name == vmSymbols::object_initializer_name()) {
LinkResolver::resolve_special_call(result,
defc, name, type, caller, caller.not_null(), THREAD);
} else {
break; // will throw after end of switch
}
if (HAS_PENDING_EXCEPTION) {
return empty;
}
}
assert(result.is_statically_bound(), "");
oop mname2 = init_method_MemberName(mname, result);
return Handle(THREAD, mname2);
}
case IS_FIELD:
{
fieldDescriptor result; // find_field initializes fd if found
{
assert(!HAS_PENDING_EXCEPTION, "");
LinkResolver::resolve_field(result, defc, name, type, caller, Bytecodes::_nop, false, false, THREAD);
if (HAS_PENDING_EXCEPTION) {
return empty;
}
}
oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind));
return Handle(THREAD, mname2);
}
default:
THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty);
}
return empty;
}
// Conversely, a member name which is only initialized from JVM internals
// may have null defc, name, and type fields.
// Resolving it plants a vmtarget/vmindex in it,
// which refers directly to JVM internals.
void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) {
assert(java_lang_invoke_MemberName::is_instance(mname()), "");
Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
int vmindex = java_lang_invoke_MemberName::vmindex(mname());
if (vmtarget == NULL) {
THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand");
}
bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL);
bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL);
bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL);
int flags = java_lang_invoke_MemberName::flags(mname());
if (suppress != 0) {
if (suppress & _suppress_defc) have_defc = true;
if (suppress & _suppress_name) have_name = true;
if (suppress & _suppress_type) have_type = true;
}
if (have_defc && have_name && have_type) return; // nothing needed
switch (flags & ALL_KINDS) {
case IS_METHOD:
case IS_CONSTRUCTOR:
{
assert(vmtarget->is_method(), "method or constructor vmtarget is Method*");
methodHandle m(THREAD, (Method*)vmtarget);
DEBUG_ONLY(vmtarget = NULL); // safety
if (m.is_null()) break;
if (!have_defc) {
InstanceKlass* defc = m->method_holder();
java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
}
if (!have_name) {
//not java_lang_String::create_from_symbol; let's intern member names
Handle name = StringTable::intern(m->name(), CHECK);
java_lang_invoke_MemberName::set_name(mname(), name());
}
if (!have_type) {
Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK);
java_lang_invoke_MemberName::set_type(mname(), type());
}
return;
}
case IS_FIELD:
{
assert(vmtarget->is_klass(), "field vmtarget is Klass*");
if (!((Klass*) vmtarget)->oop_is_instance()) break;
instanceKlassHandle defc(THREAD, (Klass*) vmtarget);
DEBUG_ONLY(vmtarget = NULL); // safety
bool is_static = ((flags & JVM_ACC_STATIC) != 0);
fieldDescriptor fd; // find_field initializes fd if found
if (!defc->find_field_from_offset(vmindex, is_static, &fd))
break; // cannot expand
if (!have_defc) {
java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror());
}
if (!have_name) {
//not java_lang_String::create_from_symbol; let's intern member names
Handle name = StringTable::intern(fd.name(), CHECK);
java_lang_invoke_MemberName::set_name(mname(), name());
}
if (!have_type) {
// If it is a primitive field type, don't mess with short strings like "I".
Handle type = field_signature_type_or_null(fd.signature());
if (type.is_null()) {
java_lang_String::create_from_symbol(fd.signature(), CHECK);
}
java_lang_invoke_MemberName::set_type(mname(), type());
}
return;
}
}
THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format");
}
int MethodHandles::find_MemberNames(KlassHandle k,
Symbol* name, Symbol* sig,
int mflags, KlassHandle caller,
int skip, objArrayHandle results) {
// %%% take caller into account!
Thread* thread = Thread::current();
if (k.is_null() || !k->oop_is_instance()) return -1;
int rfill = 0, rlimit = results->length(), rskip = skip;
// overflow measurement:
int overflow = 0, overflow_limit = MAX2(1000, rlimit);
int match_flags = mflags;
bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0);
bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0);
bool local_only = !(search_superc | search_intfc);
bool classes_only = false;
if (name != NULL) {
if (name->utf8_length() == 0) return 0; // a match is not possible
}
if (sig != NULL) {
if (sig->utf8_length() == 0) return 0; // a match is not possible
if (sig->byte_at(0) == '(')
match_flags &= ~(IS_FIELD | IS_TYPE);
else
match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD);
}
if ((match_flags & IS_TYPE) != 0) {
// NYI, and Core Reflection works quite well for this query
}
if ((match_flags & IS_FIELD) != 0) {
for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
if (name != NULL && st.name() != name)
continue;
if (sig != NULL && st.signature() != sig)
continue;
// passed the filters
if (rskip > 0) {
--rskip;
} else if (rfill < rlimit) {
Handle result(thread, results->obj_at(rfill++));
if (!java_lang_invoke_MemberName::is_instance(result()))
return -99; // caller bug!
oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor());
if (saved != result())
results->obj_at_put(rfill-1, saved); // show saved instance to user
} else if (++overflow >= overflow_limit) {
match_flags = 0; break; // got tired of looking at overflow
}
}
}
if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) {
// watch out for these guys:
Symbol* init_name = vmSymbols::object_initializer_name();
Symbol* clinit_name = vmSymbols::class_initializer_name();
if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit>
bool negate_name_test = false;
// fix name so that it captures the intention of IS_CONSTRUCTOR
if (!(match_flags & IS_METHOD)) {
// constructors only
if (name == NULL) {
name = init_name;
} else if (name != init_name) {
return 0; // no constructors of this method name
}
} else if (!(match_flags & IS_CONSTRUCTOR)) {
// methods only
if (name == NULL) {
name = init_name;
negate_name_test = true; // if we see the name, we *omit* the entry
} else if (name == init_name) {
return 0; // no methods of this constructor name
}
} else {
// caller will accept either sort; no need to adjust name
}
for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) {
Method* m = st.method();
Symbol* m_name = m->name();
if (m_name == clinit_name)
continue;
if (name != NULL && ((m_name != name) ^ negate_name_test))
continue;
if (sig != NULL && m->signature() != sig)
continue;
// passed the filters
if (rskip > 0) {
--rskip;
} else if (rfill < rlimit) {
Handle result(thread, results->obj_at(rfill++));
if (!java_lang_invoke_MemberName::is_instance(result()))
return -99; // caller bug!
CallInfo info(m);
oop saved = MethodHandles::init_method_MemberName(result, info);
if (saved != result())
results->obj_at_put(rfill-1, saved); // show saved instance to user
} else if (++overflow >= overflow_limit) {
match_flags = 0; break; // got tired of looking at overflow
}
}
}
// return number of elements we at leasted wanted to initialize
return rfill + overflow;
}
//------------------------------------------------------------------------------
// MemberNameTable
//
MemberNameTable::MemberNameTable(int methods_cnt)
: GrowableArray<jweak>(methods_cnt, true) {
assert_locked_or_safepoint(MemberNameTable_lock);
}
MemberNameTable::~MemberNameTable() {
assert_locked_or_safepoint(MemberNameTable_lock);
int len = this->length();
for (int idx = 0; idx < len; idx++) {
jweak ref = this->at(idx);
JNIHandles::destroy_weak_global(ref);
}
}
void MemberNameTable::add_member_name(int index, jweak mem_name_wref) {
assert_locked_or_safepoint(MemberNameTable_lock);
this->at_put_grow(index, mem_name_wref);
}
// Return a member name oop or NULL.
oop MemberNameTable::get_member_name(int index) {
assert_locked_or_safepoint(MemberNameTable_lock);
jweak ref = this->at(index);
oop mem_name = JNIHandles::resolve(ref);
return mem_name;
}
#if INCLUDE_JVMTI
oop MemberNameTable::find_member_name_by_method(Method* old_method) {
assert_locked_or_safepoint(MemberNameTable_lock);
oop found = NULL;
int len = this->length();
for (int idx = 0; idx < len; idx++) {
oop mem_name = JNIHandles::resolve(this->at(idx));
if (mem_name == NULL) {
continue;
}
Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name);
if (method == old_method) {
found = mem_name;
break;
}
}
return found;
}
// It is called at safepoint only
void MemberNameTable::adjust_method_entries(Method** old_methods, Method** new_methods,
int methods_length, bool *trace_name_printed) {
assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
// search the MemberNameTable for uses of either obsolete or EMCP methods
for (int j = 0; j < methods_length; j++) {
Method* old_method = old_methods[j];
Method* new_method = new_methods[j];
oop mem_name = find_member_name_by_method(old_method);
if (mem_name != NULL) {
java_lang_invoke_MemberName::adjust_vmtarget(mem_name, new_method);
if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
if (!(*trace_name_printed)) {
// RC_TRACE_MESG macro has an embedded ResourceMark
RC_TRACE_MESG(("adjust: name=%s",
old_method->method_holder()->external_name()));
*trace_name_printed = true;
}
// RC_TRACE macro has an embedded ResourceMark
RC_TRACE(0x00400000, ("MemberName method update: %s(%s)",
new_method->name()->as_C_string(),
new_method->signature()->as_C_string()));
}
}
}
}
#endif // INCLUDE_JVMTI
//
// Here are the native methods in java.lang.invoke.MethodHandleNatives
// They are the private interface between this JVM and the HotSpot-specific
// Java code that implements JSR 292 method handles.
//
// Note: We use a JVM_ENTRY macro to define each of these, for this is the way
// that intrinsic (non-JNI) native methods are defined in HotSpot.
//
JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) {
switch (which) {
case MethodHandles::GC_COUNT_GWT:
#ifdef COMPILER2
return true;
#else
return false;
#endif
}
return 0;
}
JVM_END
#ifndef PRODUCT
#define EACH_NAMED_CON(template, requirement) \
template(MethodHandles,GC_COUNT_GWT) \
template(java_lang_invoke_MemberName,MN_IS_METHOD) \
template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \
template(java_lang_invoke_MemberName,MN_IS_FIELD) \
template(java_lang_invoke_MemberName,MN_IS_TYPE) \
template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \
template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \
template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \
template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \
template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \
template(MethodHandles,GC_LAMBDA_SUPPORT) \
/*end*/
#define IGNORE_REQ(req_expr) /* req_expr */
#define ONE_PLUS(scope,value) 1+
static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0;
#define VALUE_COMMA(scope,value) scope::value,
static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 };
#define STRING_NULL(scope,value) #value "\0"
static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) };
static bool advertise_con_value(int which) {
if (which < 0) return false;
bool ok = true;
int count = 0;
#define INC_COUNT(scope,value) \
++count;
#define CHECK_REQ(req_expr) \
if (which < count) return ok; \
ok = (req_expr);
EACH_NAMED_CON(INC_COUNT, CHECK_REQ);
#undef INC_COUNT
#undef CHECK_REQ
assert(count == con_value_count, "");
if (which < count) return ok;
return false;
}
#undef ONE_PLUS
#undef VALUE_COMMA
#undef STRING_NULL
#undef EACH_NAMED_CON
#endif // PRODUCT
JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) {
#ifndef PRODUCT
if (advertise_con_value(which)) {
assert(which >= 0 && which < con_value_count, "");
int con = con_values[which];
objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh));
if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) {
const char* str = &con_names[0];
for (int i = 0; i < which; i++)
str += strlen(str) + 1; // skip name and null
oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint
box->obj_at_put(0, name);
}
return con;
}
#endif
return 0;
}
JVM_END
// void init(MemberName self, AccessibleObject ref)
JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) {
if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); }
Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
Handle target(THREAD, JNIHandles::resolve_non_null(target_jh));
MethodHandles::init_MemberName(mname, target);
}
JVM_END
// void expand(MemberName self)
JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) {
if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); }
Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
MethodHandles::expand_MemberName(mname, 0, CHECK);
}
JVM_END
// void resolve(MemberName self, Class<?> caller)
JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) {
if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); }
Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
// The trusted Java code that calls this method should already have performed
// access checks on behalf of the given caller. But, we can verify this.
if (VerifyMethodHandles && caller_jh != NULL &&
java_lang_invoke_MemberName::clazz(mname()) != NULL) {
Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname()));
if (reference_klass != NULL && reference_klass->oop_is_objArray()) {
reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass();
}
// Reflection::verify_class_access can only handle instance classes.
if (reference_klass != NULL && reference_klass->oop_is_instance()) {
// Emulate LinkResolver::check_klass_accessability.
Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh));
if (!Reflection::verify_class_access(caller,
reference_klass,
true)) {
THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name());
}
}
}
KlassHandle caller(THREAD,
caller_jh == NULL ? (Klass*) NULL :
java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)));
Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL);
if (resolved.is_null()) {
int flags = java_lang_invoke_MemberName::flags(mname());
int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK;
if (!MethodHandles::ref_kind_is_valid(ref_kind)) {
THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format");
}
if ((flags & ALL_KINDS) == IS_FIELD) {
THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed");
} else if ((flags & ALL_KINDS) == IS_METHOD ||
(flags & ALL_KINDS) == IS_CONSTRUCTOR) {
THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed");
} else {
THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed");
}
}
return JNIHandles::make_local(THREAD, resolved());
}
JVM_END
static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) {
if (mname == NULL ||
java_lang_invoke_MemberName::vmtarget(mname) == NULL) {
THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved");
} else {
int flags = java_lang_invoke_MemberName::flags(mname);
if ((flags & IS_FIELD) != 0 &&
(must_be_static
? (flags & JVM_ACC_STATIC) != 0
: (flags & JVM_ACC_STATIC) == 0)) {
int vmindex = java_lang_invoke_MemberName::vmindex(mname);
return (jlong) vmindex;
}
}
const char* msg = (must_be_static ? "static field required" : "non-static field required");
THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg);
return 0;
}
JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD);
}
JVM_END
JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) {
return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD);
}
JVM_END
JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) {
// use the other function to perform sanity checks:
jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL);
oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh));
return JNIHandles::make_local(THREAD, clazz);
}
JVM_END
JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) {
if (mname_jh == NULL) return NULL;
Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh));
intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname());
Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname());
objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL);
jvalue vmindex_value; vmindex_value.j = (long)vmindex;
oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL);
result->obj_at_put(0, x);
x = NULL;
if (vmtarget == NULL) {
x = NULL;
} else if (vmtarget->is_klass()) {
x = ((Klass*) vmtarget)->java_mirror();
} else if (vmtarget->is_method()) {
x = mname();
}
result->obj_at_put(1, x);
return JNIHandles::make_local(env, result());
}
JVM_END
// static native int getMembers(Class<?> defc, String matchName, String matchSig,
// int matchFlags, Class<?> caller, int skip, MemberName[] results);
JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls,
jclass clazz_jh, jstring name_jh, jstring sig_jh,
int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) {
if (clazz_jh == NULL || results_jh == NULL) return -1;
KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)));
objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh));
if (results.is_null() || !results->is_objArray()) return -1;
TempNewSymbol name = NULL;
TempNewSymbol sig = NULL;
if (name_jh != NULL) {
name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh));
if (name == NULL) return 0; // a match is not possible
}
if (sig_jh != NULL) {
sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh));
if (sig == NULL) return 0; // a match is not possible
}
KlassHandle caller;
if (caller_jh != NULL) {
oop caller_oop = JNIHandles::resolve_non_null(caller_jh);
if (!java_lang_Class::is_instance(caller_oop)) return -1;
caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop));
}
if (name != NULL && sig != NULL && results.not_null()) {
// try a direct resolve
// %%% TO DO
}
int res = MethodHandles::find_MemberNames(k, name, sig, mflags,
caller, skip, results);
// TO DO: expand at least some of the MemberNames, to avoid massive callbacks
return res;
}
JVM_END
JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
Handle target (THREAD, JNIHandles::resolve(target_jh));
{
// Walk all nmethods depending on this call site.
MutexLocker mu(Compile_lock, thread);
Universe::flush_dependents_on(call_site, target);
java_lang_invoke_CallSite::set_target(call_site(), target());
}
}
JVM_END
JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) {
Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh));
Handle target (THREAD, JNIHandles::resolve(target_jh));
{
// Walk all nmethods depending on this call site.
MutexLocker mu(Compile_lock, thread);
Universe::flush_dependents_on(call_site, target);
java_lang_invoke_CallSite::set_target_volatile(call_site(), target());
}
}
JVM_END
/**
* Throws a java/lang/UnsupportedOperationException unconditionally.
* This is required by the specification of MethodHandle.invoke if
* invoked directly.
*/
JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively");
return NULL;
}
JVM_END
/**
* Throws a java/lang/UnsupportedOperationException unconditionally.
* This is required by the specification of MethodHandle.invokeExact if
* invoked directly.
*/
JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) {
THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively");
return NULL;
}
JVM_END
/// JVM_RegisterMethodHandleMethods
#undef CS // Solaris builds complain
#define LANG "Ljava/lang/"
#define JLINV "Ljava/lang/invoke/"
#define OBJ LANG"Object;"
#define CLS LANG"Class;"
#define STRG LANG"String;"
#define CS JLINV"CallSite;"
#define MT JLINV"MethodType;"
#define MH JLINV"MethodHandle;"
#define MEM JLINV"MemberName;"
#define CC (char*) /*cast a literal from (const char*)*/
#define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
// These are the native methods on java.lang.invoke.MethodHandleNatives.
static JNINativeMethod MHN_methods[] = {
{CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)},
{CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)},
{CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)},
{CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)},
// static native int getNamedCon(int which, Object[] name)
{CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)},
// static native int getMembers(Class<?> defc, String matchName, String matchSig,
// int matchFlags, Class<?> caller, int skip, MemberName[] results);
{CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)},
{CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)},
{CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)},
{CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)},
{CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)},
{CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)},
{CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)}
};
static JNINativeMethod MH_methods[] = {
// UnsupportedOperationException throwers
{CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)},
{CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)}
};
/**
* Helper method to register native methods.
*/
static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) {
int status = env->RegisterNatives(clazz, methods, nMethods);
if (status != JNI_OK || env->ExceptionOccurred()) {
warning("JSR 292 method handle code is mismatched to this JVM. Disabling support.");
env->ExceptionClear();
return false;
}
return true;
}
/**
* This one function is exported, used by NativeLookup.
*/
JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) {
if (!EnableInvokeDynamic) {
warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable.");
return; // bind nothing
}
assert(!MethodHandles::enabled(), "must not be enabled");
bool enable_MH = true;
jclass MH_class = NULL;
if (SystemDictionary::MethodHandle_klass() == NULL) {
enable_MH = false;
} else {
oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror();
MH_class = (jclass) JNIHandles::make_local(env, mirror);
}
if (enable_MH) {
ThreadToNativeFromVM ttnfv(thread);
if (enable_MH) {
enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod));
}
if (enable_MH) {
enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod));
}
}
if (TraceInvokeDynamic) {
tty->print_cr("MethodHandle support loaded (using LambdaForms)");
}
if (enable_MH) {
MethodHandles::generate_adapters();
MethodHandles::set_enabled(true);
}
}
JVM_END
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