Java example source code file (linkResolver.cpp)
The linkResolver.cpp Java example source code/*
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* 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
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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#include "precompiled.hpp"
#include "classfile/defaultMethods.hpp"
#include "classfile/systemDictionary.hpp"
#include "classfile/vmSymbols.hpp"
#include "compiler/compileBroker.hpp"
#include "gc_interface/collectedHeap.inline.hpp"
#include "interpreter/bytecode.hpp"
#include "interpreter/interpreterRuntime.hpp"
#include "interpreter/linkResolver.hpp"
#include "memory/resourceArea.hpp"
#include "memory/universe.inline.hpp"
#include "oops/instanceKlass.hpp"
#include "oops/objArrayOop.hpp"
#include "prims/methodHandles.hpp"
#include "prims/nativeLookup.hpp"
#include "runtime/compilationPolicy.hpp"
#include "runtime/fieldDescriptor.hpp"
#include "runtime/frame.inline.hpp"
#include "runtime/handles.inline.hpp"
#include "runtime/reflection.hpp"
#include "runtime/signature.hpp"
#include "runtime/thread.inline.hpp"
#include "runtime/vmThread.hpp"
//------------------------------------------------------------------------------------------------------------------------
// Implementation of CallInfo
void CallInfo::set_static(KlassHandle resolved_klass, methodHandle resolved_method, TRAPS) {
int vtable_index = Method::nonvirtual_vtable_index;
set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
}
void CallInfo::set_interface(KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int itable_index, TRAPS) {
// This is only called for interface methods. If the resolved_method
// comes from java/lang/Object, it can be the subject of a virtual call, so
// we should pick the vtable index from the resolved method.
// In that case, the caller must call set_virtual instead of set_interface.
assert(resolved_method->method_holder()->is_interface(), "");
assert(itable_index == resolved_method()->itable_index(), "");
set_common(resolved_klass, selected_klass, resolved_method, selected_method, CallInfo::itable_call, itable_index, CHECK);
}
void CallInfo::set_virtual(KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int vtable_index, TRAPS) {
assert(vtable_index >= 0 || vtable_index == Method::nonvirtual_vtable_index, "valid index");
assert(vtable_index < 0 || !resolved_method->has_vtable_index() || vtable_index == resolved_method->vtable_index(), "");
CallKind kind = (vtable_index >= 0 && !resolved_method->can_be_statically_bound() ? CallInfo::vtable_call : CallInfo::direct_call);
set_common(resolved_klass, selected_klass, resolved_method, selected_method, kind, vtable_index, CHECK);
assert(!resolved_method->is_compiled_lambda_form(), "these must be handled via an invokehandle call");
}
void CallInfo::set_handle(methodHandle resolved_method, Handle resolved_appendix, Handle resolved_method_type, TRAPS) {
if (resolved_method.is_null()) {
THROW_MSG(vmSymbols::java_lang_InternalError(), "resolved method is null");
}
KlassHandle resolved_klass = SystemDictionary::MethodHandle_klass();
assert(resolved_method->intrinsic_id() == vmIntrinsics::_invokeBasic ||
resolved_method->is_compiled_lambda_form(),
"linkMethod must return one of these");
int vtable_index = Method::nonvirtual_vtable_index;
assert(!resolved_method->has_vtable_index(), "");
set_common(resolved_klass, resolved_klass, resolved_method, resolved_method, CallInfo::direct_call, vtable_index, CHECK);
_resolved_appendix = resolved_appendix;
_resolved_method_type = resolved_method_type;
}
void CallInfo::set_common(KlassHandle resolved_klass,
KlassHandle selected_klass,
methodHandle resolved_method,
methodHandle selected_method,
CallKind kind,
int index,
TRAPS) {
assert(resolved_method->signature() == selected_method->signature(), "signatures must correspond");
_resolved_klass = resolved_klass;
_selected_klass = selected_klass;
_resolved_method = resolved_method;
_selected_method = selected_method;
_call_kind = kind;
_call_index = index;
_resolved_appendix = Handle();
DEBUG_ONLY(verify()); // verify before making side effects
if (CompilationPolicy::must_be_compiled(selected_method)) {
// This path is unusual, mostly used by the '-Xcomp' stress test mode.
// Note: with several active threads, the must_be_compiled may be true
// while can_be_compiled is false; remove assert
// assert(CompilationPolicy::can_be_compiled(selected_method), "cannot compile");
if (THREAD->is_Compiler_thread()) {
// don't force compilation, resolve was on behalf of compiler
return;
}
if (selected_method->method_holder()->is_not_initialized()) {
// 'is_not_initialized' means not only '!is_initialized', but also that
// initialization has not been started yet ('!being_initialized')
// Do not force compilation of methods in uninitialized classes.
// Note that doing this would throw an assert later,
// in CompileBroker::compile_method.
// We sometimes use the link resolver to do reflective lookups
// even before classes are initialized.
return;
}
CompileBroker::compile_method(selected_method, InvocationEntryBci,
CompilationPolicy::policy()->initial_compile_level(),
methodHandle(), 0, "must_be_compiled", CHECK);
}
}
// utility query for unreflecting a method
CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass) {
Klass* resolved_method_holder = resolved_method->method_holder();
if (resolved_klass == NULL) { // 2nd argument defaults to holder of 1st
resolved_klass = resolved_method_holder;
}
_resolved_klass = resolved_klass;
_selected_klass = resolved_klass;
_resolved_method = resolved_method;
_selected_method = resolved_method;
// classify:
CallKind kind = CallInfo::unknown_kind;
int index = resolved_method->vtable_index();
if (resolved_method->can_be_statically_bound()) {
kind = CallInfo::direct_call;
} else if (!resolved_method_holder->is_interface()) {
// Could be an Object method inherited into an interface, but still a vtable call.
kind = CallInfo::vtable_call;
} else if (!resolved_klass->is_interface()) {
// A default or miranda method. Compute the vtable index.
ResourceMark rm;
klassVtable* vt = InstanceKlass::cast(resolved_klass)->vtable();
index = LinkResolver::vtable_index_of_interface_method(resolved_klass,
resolved_method);
assert(index >= 0 , "we should have valid vtable index at this point");
kind = CallInfo::vtable_call;
} else if (resolved_method->has_vtable_index()) {
// Can occur if an interface redeclares a method of Object.
#ifdef ASSERT
// Ensure that this is really the case.
KlassHandle object_klass = SystemDictionary::Object_klass();
Method * object_resolved_method = object_klass()->vtable()->method_at(index);
assert(object_resolved_method->name() == resolved_method->name(),
err_msg("Object and interface method names should match at vtable index %d, %s != %s",
index, object_resolved_method->name()->as_C_string(), resolved_method->name()->as_C_string()));
assert(object_resolved_method->signature() == resolved_method->signature(),
err_msg("Object and interface method signatures should match at vtable index %d, %s != %s",
index, object_resolved_method->signature()->as_C_string(), resolved_method->signature()->as_C_string()));
#endif // ASSERT
kind = CallInfo::vtable_call;
} else {
// A regular interface call.
kind = CallInfo::itable_call;
index = resolved_method->itable_index();
}
assert(index == Method::nonvirtual_vtable_index || index >= 0, err_msg("bad index %d", index));
_call_kind = kind;
_call_index = index;
_resolved_appendix = Handle();
DEBUG_ONLY(verify());
}
#ifdef ASSERT
void CallInfo::verify() {
switch (call_kind()) { // the meaning and allowed value of index depends on kind
case CallInfo::direct_call:
if (_call_index == Method::nonvirtual_vtable_index) break;
// else fall through to check vtable index:
case CallInfo::vtable_call:
assert(resolved_klass()->verify_vtable_index(_call_index), "");
break;
case CallInfo::itable_call:
assert(resolved_method()->method_holder()->verify_itable_index(_call_index), "");
break;
case CallInfo::unknown_kind:
assert(call_kind() != CallInfo::unknown_kind, "CallInfo must be set");
break;
default:
fatal(err_msg_res("Unexpected call kind %d", call_kind()));
}
}
#endif //ASSERT
//------------------------------------------------------------------------------------------------------------------------
// Klass resolution
void LinkResolver::check_klass_accessability(KlassHandle ref_klass, KlassHandle sel_klass, TRAPS) {
if (!Reflection::verify_class_access(ref_klass(),
sel_klass(),
true)) {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_IllegalAccessError(),
"tried to access class %s from class %s",
sel_klass->external_name(),
ref_klass->external_name()
);
return;
}
}
void LinkResolver::resolve_klass(KlassHandle& result, constantPoolHandle pool, int index, TRAPS) {
Klass* result_oop = pool->klass_ref_at(index, CHECK);
result = KlassHandle(THREAD, result_oop);
}
//------------------------------------------------------------------------------------------------------------------------
// Method resolution
//
// According to JVM spec. $5.4.3c & $5.4.3d
// Look up method in klasses, including static methods
// Then look up local default methods
void LinkResolver::lookup_method_in_klasses(methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, bool checkpolymorphism, bool in_imethod_resolve, TRAPS) {
Method* result_oop = klass->uncached_lookup_method(name, signature);
// JDK 8, JVMS 5.4.3.4: Interface method resolution should
// ignore static and non-public methods of java.lang.Object,
// like clone, finalize, registerNatives.
if (in_imethod_resolve &&
result_oop != NULL &&
klass->is_interface() &&
(result_oop->is_static() || !result_oop->is_public()) &&
result_oop->method_holder() == SystemDictionary::Object_klass()) {
result_oop = NULL;
}
if (result_oop == NULL) {
Array<Method*>* default_methods = InstanceKlass::cast(klass())->default_methods();
if (default_methods != NULL) {
result_oop = InstanceKlass::find_method(default_methods, name, signature);
}
}
if (checkpolymorphism && EnableInvokeDynamic && result_oop != NULL) {
vmIntrinsics::ID iid = result_oop->intrinsic_id();
if (MethodHandles::is_signature_polymorphic(iid)) {
// Do not link directly to these. The VM must produce a synthetic one using lookup_polymorphic_method.
return;
}
}
result = methodHandle(THREAD, result_oop);
}
// returns first instance method
// Looks up method in classes, then looks up local default methods
void LinkResolver::lookup_instance_method_in_klasses(methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS) {
Method* result_oop = klass->uncached_lookup_method(name, signature);
result = methodHandle(THREAD, result_oop);
while (!result.is_null() && result->is_static() && result->method_holder()->super() != NULL) {
KlassHandle super_klass = KlassHandle(THREAD, result->method_holder()->super());
result = methodHandle(THREAD, super_klass->uncached_lookup_method(name, signature));
}
if (result.is_null()) {
Array<Method*>* default_methods = InstanceKlass::cast(klass())->default_methods();
if (default_methods != NULL) {
result = methodHandle(InstanceKlass::find_method(default_methods, name, signature));
assert(result.is_null() || !result->is_static(), "static defaults not allowed");
}
}
}
int LinkResolver::vtable_index_of_interface_method(KlassHandle klass,
methodHandle resolved_method) {
int vtable_index = Method::invalid_vtable_index;
Symbol* name = resolved_method->name();
Symbol* signature = resolved_method->signature();
// First check in default method array
if (!resolved_method->is_abstract() &&
(InstanceKlass::cast(klass())->default_methods() != NULL)) {
int index = InstanceKlass::find_method_index(InstanceKlass::cast(klass())->default_methods(), name, signature);
if (index >= 0 ) {
vtable_index = InstanceKlass::cast(klass())->default_vtable_indices()->at(index);
}
}
if (vtable_index == Method::invalid_vtable_index) {
// get vtable_index for miranda methods
ResourceMark rm;
klassVtable *vt = InstanceKlass::cast(klass())->vtable();
vtable_index = vt->index_of_miranda(name, signature);
}
return vtable_index;
}
void LinkResolver::lookup_method_in_interfaces(methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS) {
InstanceKlass *ik = InstanceKlass::cast(klass());
// Specify 'true' in order to skip default methods when searching the
// interfaces. Function lookup_method_in_klasses() already looked for
// the method in the default methods table.
result = methodHandle(THREAD, ik->lookup_method_in_all_interfaces(name, signature, true));
}
void LinkResolver::lookup_polymorphic_method(methodHandle& result,
KlassHandle klass, Symbol* name, Symbol* full_signature,
KlassHandle current_klass,
Handle *appendix_result_or_null,
Handle *method_type_result,
TRAPS) {
vmIntrinsics::ID iid = MethodHandles::signature_polymorphic_name_id(name);
if (TraceMethodHandles) {
ResourceMark rm(THREAD);
tty->print_cr("lookup_polymorphic_method iid=%s %s.%s%s",
vmIntrinsics::name_at(iid), klass->external_name(),
name->as_C_string(), full_signature->as_C_string());
}
if (EnableInvokeDynamic &&
klass() == SystemDictionary::MethodHandle_klass() &&
iid != vmIntrinsics::_none) {
if (MethodHandles::is_signature_polymorphic_intrinsic(iid)) {
// Most of these do not need an up-call to Java to resolve, so can be done anywhere.
// Do not erase last argument type (MemberName) if it is a static linkTo method.
bool keep_last_arg = MethodHandles::is_signature_polymorphic_static(iid);
TempNewSymbol basic_signature =
MethodHandles::lookup_basic_type_signature(full_signature, keep_last_arg, CHECK);
if (TraceMethodHandles) {
ResourceMark rm(THREAD);
tty->print_cr("lookup_polymorphic_method %s %s => basic %s",
name->as_C_string(),
full_signature->as_C_string(),
basic_signature->as_C_string());
}
result = SystemDictionary::find_method_handle_intrinsic(iid,
basic_signature,
CHECK);
if (result.not_null()) {
assert(result->is_method_handle_intrinsic(), "MH.invokeBasic or MH.linkTo* intrinsic");
assert(result->intrinsic_id() != vmIntrinsics::_invokeGeneric, "wrong place to find this");
assert(basic_signature == result->signature(), "predict the result signature");
if (TraceMethodHandles) {
tty->print("lookup_polymorphic_method => intrinsic ");
result->print_on(tty);
}
return;
}
} else if (iid == vmIntrinsics::_invokeGeneric
&& !THREAD->is_Compiler_thread()
&& appendix_result_or_null != NULL) {
// This is a method with type-checking semantics.
// We will ask Java code to spin an adapter method for it.
if (!MethodHandles::enabled()) {
// Make sure the Java part of the runtime has been booted up.
Klass* natives = SystemDictionary::MethodHandleNatives_klass();
if (natives == NULL || InstanceKlass::cast(natives)->is_not_initialized()) {
SystemDictionary::resolve_or_fail(vmSymbols::java_lang_invoke_MethodHandleNatives(),
Handle(),
Handle(),
true,
CHECK);
}
}
Handle appendix;
Handle method_type;
result = SystemDictionary::find_method_handle_invoker(name,
full_signature,
current_klass,
&appendix,
&method_type,
CHECK);
if (TraceMethodHandles) {
tty->print("lookup_polymorphic_method => (via Java) ");
result->print_on(tty);
tty->print(" lookup_polymorphic_method => appendix = ");
if (appendix.is_null()) tty->print_cr("(none)");
else appendix->print_on(tty);
}
if (result.not_null()) {
#ifdef ASSERT
ResourceMark rm(THREAD);
TempNewSymbol basic_signature =
MethodHandles::lookup_basic_type_signature(full_signature, CHECK);
int actual_size_of_params = result->size_of_parameters();
int expected_size_of_params = ArgumentSizeComputer(basic_signature).size();
// +1 for MethodHandle.this, +1 for trailing MethodType
if (!MethodHandles::is_signature_polymorphic_static(iid)) expected_size_of_params += 1;
if (appendix.not_null()) expected_size_of_params += 1;
if (actual_size_of_params != expected_size_of_params) {
tty->print_cr("*** basic_signature=%s", basic_signature->as_C_string());
tty->print_cr("*** result for %s: ", vmIntrinsics::name_at(iid));
result->print();
}
assert(actual_size_of_params == expected_size_of_params,
err_msg("%d != %d", actual_size_of_params, expected_size_of_params));
#endif //ASSERT
assert(appendix_result_or_null != NULL, "");
(*appendix_result_or_null) = appendix;
(*method_type_result) = method_type;
return;
}
}
}
}
void LinkResolver::check_method_accessability(KlassHandle ref_klass,
KlassHandle resolved_klass,
KlassHandle sel_klass,
methodHandle sel_method,
TRAPS) {
AccessFlags flags = sel_method->access_flags();
// Special case: arrays always override "clone". JVMS 2.15.
// If the resolved klass is an array class, and the declaring class
// is java.lang.Object and the method is "clone", set the flags
// to public.
//
// We'll check for the method name first, as that's most likely
// to be false (so we'll short-circuit out of these tests).
if (sel_method->name() == vmSymbols::clone_name() &&
sel_klass() == SystemDictionary::Object_klass() &&
resolved_klass->oop_is_array()) {
// We need to change "protected" to "public".
assert(flags.is_protected(), "clone not protected?");
jint new_flags = flags.as_int();
new_flags = new_flags & (~JVM_ACC_PROTECTED);
new_flags = new_flags | JVM_ACC_PUBLIC;
flags.set_flags(new_flags);
}
// assert(extra_arg_result_or_null != NULL, "must be able to return extra argument");
if (!Reflection::verify_field_access(ref_klass(),
resolved_klass(),
sel_klass(),
flags,
true)) {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_IllegalAccessError(),
"tried to access method %s.%s%s from class %s",
sel_klass->external_name(),
sel_method->name()->as_C_string(),
sel_method->signature()->as_C_string(),
ref_klass->external_name()
);
return;
}
}
void LinkResolver::resolve_method_statically(methodHandle& resolved_method, KlassHandle& resolved_klass,
Bytecodes::Code code, constantPoolHandle pool, int index, TRAPS) {
// This method is used only
// (1) in C2 from InlineTree::ok_to_inline (via ciMethod::check_call),
// and
// (2) in Bytecode_invoke::static_target
// It appears to fail when applied to an invokeinterface call site.
// FIXME: Remove this method and ciMethod::check_call; refactor to use the other LinkResolver entry points.
// resolve klass
if (code == Bytecodes::_invokedynamic) {
resolved_klass = SystemDictionary::MethodHandle_klass();
Symbol* method_name = vmSymbols::invoke_name();
Symbol* method_signature = pool->signature_ref_at(index);
KlassHandle current_klass(THREAD, pool->pool_holder());
resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, true, false, CHECK);
return;
}
resolve_klass(resolved_klass, pool, index, CHECK);
Symbol* method_name = pool->name_ref_at(index);
Symbol* method_signature = pool->signature_ref_at(index);
KlassHandle current_klass(THREAD, pool->pool_holder());
if (pool->has_preresolution()
|| (resolved_klass() == SystemDictionary::MethodHandle_klass() &&
MethodHandles::is_signature_polymorphic_name(resolved_klass(), method_name))) {
Method* result_oop = ConstantPool::method_at_if_loaded(pool, index);
if (result_oop != NULL) {
resolved_method = methodHandle(THREAD, result_oop);
return;
}
}
if (code == Bytecodes::_invokeinterface) {
resolve_interface_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, true, true, CHECK);
} else if (code == Bytecodes::_invokevirtual) {
resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, true, true, CHECK);
} else if (!resolved_klass->is_interface()) {
resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, true, false, CHECK);
} else {
bool nostatics = (code == Bytecodes::_invokestatic) ? false : true;
resolve_interface_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, true, nostatics, CHECK);
}
}
void LinkResolver::resolve_method(methodHandle& resolved_method, KlassHandle resolved_klass,
Symbol* method_name, Symbol* method_signature,
KlassHandle current_klass, bool check_access,
bool require_methodref, TRAPS) {
Handle nested_exception;
// 1. check if methodref required, that resolved_klass is not interfacemethodref
if (require_methodref && resolved_klass->is_interface()) {
ResourceMark rm(THREAD);
char buf[200];
jio_snprintf(buf, sizeof(buf), "Found interface %s, but class was expected",
resolved_klass()->external_name());
THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
}
// 2. lookup method in resolved klass and its super klasses
lookup_method_in_klasses(resolved_method, resolved_klass, method_name, method_signature, true, false, CHECK);
if (resolved_method.is_null()) { // not found in the class hierarchy
// 3. lookup method in all the interfaces implemented by the resolved klass
lookup_method_in_interfaces(resolved_method, resolved_klass, method_name, method_signature, CHECK);
if (resolved_method.is_null()) {
// JSR 292: see if this is an implicitly generated method MethodHandle.linkToVirtual(*...), etc
lookup_polymorphic_method(resolved_method, resolved_klass, method_name, method_signature,
current_klass, (Handle*)NULL, (Handle*)NULL, THREAD);
if (HAS_PENDING_EXCEPTION) {
nested_exception = Handle(THREAD, PENDING_EXCEPTION);
CLEAR_PENDING_EXCEPTION;
}
}
if (resolved_method.is_null()) {
// 4. method lookup failed
ResourceMark rm(THREAD);
THROW_MSG_CAUSE(vmSymbols::java_lang_NoSuchMethodError(),
Method::name_and_sig_as_C_string(resolved_klass(),
method_name,
method_signature),
nested_exception);
}
}
// 5. check if method is concrete
if (resolved_method->is_abstract() && !resolved_klass->is_abstract()) {
ResourceMark rm(THREAD);
THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
Method::name_and_sig_as_C_string(resolved_klass(),
method_name,
method_signature));
}
// 6. access checks, access checking may be turned off when calling from within the VM.
if (check_access) {
assert(current_klass.not_null() , "current_klass should not be null");
// check if method can be accessed by the referring class
check_method_accessability(current_klass,
resolved_klass,
KlassHandle(THREAD, resolved_method->method_holder()),
resolved_method,
CHECK);
// check loader constraints
Handle loader (THREAD, InstanceKlass::cast(current_klass())->class_loader());
Handle class_loader (THREAD, resolved_method->method_holder()->class_loader());
{
ResourceMark rm(THREAD);
Symbol* failed_type_symbol =
SystemDictionary::check_signature_loaders(method_signature, loader,
class_loader, true, CHECK);
if (failed_type_symbol != NULL) {
const char* msg = "loader constraint violation: when resolving method"
" \"%s\" the class loader (instance of %s) of the current class, %s,"
" and the class loader (instance of %s) for the method's defining class, %s, have"
" different Class objects for the type %s used in the signature";
char* sig = Method::name_and_sig_as_C_string(resolved_klass(),method_name,method_signature);
const char* loader1 = SystemDictionary::loader_name(loader());
char* current = InstanceKlass::cast(current_klass())->name()->as_C_string();
const char* loader2 = SystemDictionary::loader_name(class_loader());
char* target = InstanceKlass::cast(resolved_method->method_holder())
->name()->as_C_string();
char* failed_type_name = failed_type_symbol->as_C_string();
size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) +
strlen(current) + strlen(loader2) + strlen(target) +
strlen(failed_type_name) + 1;
char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2,
target, failed_type_name);
THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
}
}
}
}
void LinkResolver::resolve_interface_method(methodHandle& resolved_method,
KlassHandle resolved_klass,
Symbol* method_name,
Symbol* method_signature,
KlassHandle current_klass,
bool check_access,
bool nostatics, TRAPS) {
// check if klass is interface
if (!resolved_klass->is_interface()) {
ResourceMark rm(THREAD);
char buf[200];
jio_snprintf(buf, sizeof(buf), "Found class %s, but interface was expected", resolved_klass()->external_name());
THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
}
// lookup method in this interface or its super, java.lang.Object
// JDK8: also look for static methods
lookup_method_in_klasses(resolved_method, resolved_klass, method_name, method_signature, false, true, CHECK);
if (resolved_method.is_null()) {
// lookup method in all the super-interfaces
lookup_method_in_interfaces(resolved_method, resolved_klass, method_name, method_signature, CHECK);
if (resolved_method.is_null()) {
// no method found
ResourceMark rm(THREAD);
THROW_MSG(vmSymbols::java_lang_NoSuchMethodError(),
Method::name_and_sig_as_C_string(resolved_klass(),
method_name,
method_signature));
}
}
if (nostatics && resolved_method->is_static()) {
ResourceMark rm(THREAD);
char buf[200];
jio_snprintf(buf, sizeof(buf), "Expected instance not static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
resolved_method->name(),
resolved_method->signature()));
THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
}
if (check_access) {
// JDK8 adds non-public interface methods, and accessability check requirement
assert(current_klass.not_null() , "current_klass should not be null");
// check if method can be accessed by the referring class
check_method_accessability(current_klass,
resolved_klass,
KlassHandle(THREAD, resolved_method->method_holder()),
resolved_method,
CHECK);
HandleMark hm(THREAD);
Handle loader (THREAD, InstanceKlass::cast(current_klass())->class_loader());
Handle class_loader (THREAD, resolved_method->method_holder()->class_loader());
{
ResourceMark rm(THREAD);
Symbol* failed_type_symbol =
SystemDictionary::check_signature_loaders(method_signature, loader,
class_loader, true, CHECK);
if (failed_type_symbol != NULL) {
const char* msg = "loader constraint violation: when resolving "
"interface method \"%s\" the class loader (instance of %s) of the "
"current class, %s, and the class loader (instance of %s) for "
"the method's defining class, %s, have different Class objects for the type %s "
"used in the signature";
char* sig = Method::name_and_sig_as_C_string(resolved_klass(),method_name,method_signature);
const char* loader1 = SystemDictionary::loader_name(loader());
char* current = InstanceKlass::cast(current_klass())->name()->as_C_string();
const char* loader2 = SystemDictionary::loader_name(class_loader());
char* target = InstanceKlass::cast(resolved_method->method_holder())
->name()->as_C_string();
char* failed_type_name = failed_type_symbol->as_C_string();
size_t buflen = strlen(msg) + strlen(sig) + strlen(loader1) +
strlen(current) + strlen(loader2) + strlen(target) +
strlen(failed_type_name) + 1;
char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
jio_snprintf(buf, buflen, msg, sig, loader1, current, loader2,
target, failed_type_name);
THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
}
}
}
if (TraceItables && Verbose) {
ResourceMark rm(THREAD);
tty->print("invokeinterface resolved method: caller-class:%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
(current_klass.is_null() ? "<NULL>" : current_klass->internal_name()),
(resolved_klass.is_null() ? "<NULL>" : resolved_klass->internal_name()),
Method::name_and_sig_as_C_string(resolved_klass(),
resolved_method->name(),
resolved_method->signature()),
resolved_method->method_holder()->internal_name()
);
resolved_method->access_flags().print_on(tty);
if (resolved_method->is_default_method()) {
tty->print("default ");
}
if (resolved_method->is_overpass()) {
tty->print("overpass");
}
tty->cr();
}
}
//------------------------------------------------------------------------------------------------------------------------
// Field resolution
void LinkResolver::check_field_accessability(KlassHandle ref_klass,
KlassHandle resolved_klass,
KlassHandle sel_klass,
fieldDescriptor& fd,
TRAPS) {
if (!Reflection::verify_field_access(ref_klass(),
resolved_klass(),
sel_klass(),
fd.access_flags(),
true)) {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_IllegalAccessError(),
"tried to access field %s.%s from class %s",
sel_klass->external_name(),
fd.name()->as_C_string(),
ref_klass->external_name()
);
return;
}
}
void LinkResolver::resolve_field_access(fieldDescriptor& result, constantPoolHandle pool, int index, Bytecodes::Code byte, TRAPS) {
// Load these early in case the resolve of the containing klass fails
Symbol* field = pool->name_ref_at(index);
Symbol* sig = pool->signature_ref_at(index);
// resolve specified klass
KlassHandle resolved_klass;
resolve_klass(resolved_klass, pool, index, CHECK);
KlassHandle current_klass(THREAD, pool->pool_holder());
resolve_field(result, resolved_klass, field, sig, current_klass, byte, true, true, CHECK);
}
void LinkResolver::resolve_field(fieldDescriptor& fd, KlassHandle resolved_klass, Symbol* field, Symbol* sig,
KlassHandle current_klass, Bytecodes::Code byte, bool check_access, bool initialize_class,
TRAPS) {
assert(byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic ||
byte == Bytecodes::_getfield || byte == Bytecodes::_putfield ||
(byte == Bytecodes::_nop && !check_access), "bad field access bytecode");
bool is_static = (byte == Bytecodes::_getstatic || byte == Bytecodes::_putstatic);
bool is_put = (byte == Bytecodes::_putfield || byte == Bytecodes::_putstatic);
// Check if there's a resolved klass containing the field
if (resolved_klass.is_null()) {
ResourceMark rm(THREAD);
THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
}
// Resolve instance field
KlassHandle sel_klass(THREAD, InstanceKlass::cast(resolved_klass())->find_field(field, sig, &fd));
// check if field exists; i.e., if a klass containing the field def has been selected
if (sel_klass.is_null()) {
ResourceMark rm(THREAD);
THROW_MSG(vmSymbols::java_lang_NoSuchFieldError(), field->as_C_string());
}
if (!check_access)
// Access checking may be turned off when calling from within the VM.
return;
// check access
check_field_accessability(current_klass, resolved_klass, sel_klass, fd, CHECK);
// check for errors
if (is_static != fd.is_static()) {
ResourceMark rm(THREAD);
char msg[200];
jio_snprintf(msg, sizeof(msg), "Expected %s field %s.%s", is_static ? "static" : "non-static", resolved_klass()->external_name(), fd.name()->as_C_string());
THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), msg);
}
// Final fields can only be accessed from its own class.
if (is_put && fd.access_flags().is_final() && sel_klass() != current_klass()) {
THROW(vmSymbols::java_lang_IllegalAccessError());
}
// initialize resolved_klass if necessary
// note 1: the klass which declared the field must be initialized (i.e, sel_klass)
// according to the newest JVM spec (5.5, p.170) - was bug (gri 7/28/99)
//
// note 2: we don't want to force initialization if we are just checking
// if the field access is legal; e.g., during compilation
if (is_static && initialize_class) {
sel_klass->initialize(CHECK);
}
if (sel_klass() != current_klass()) {
HandleMark hm(THREAD);
Handle ref_loader (THREAD, InstanceKlass::cast(current_klass())->class_loader());
Handle sel_loader (THREAD, InstanceKlass::cast(sel_klass())->class_loader());
{
ResourceMark rm(THREAD);
Symbol* failed_type_symbol =
SystemDictionary::check_signature_loaders(sig,
ref_loader, sel_loader,
false,
CHECK);
if (failed_type_symbol != NULL) {
const char* msg = "loader constraint violation: when resolving field"
" \"%s\" the class loader (instance of %s) of the referring class, "
"%s, and the class loader (instance of %s) for the field's resolved "
"type, %s, have different Class objects for that type";
char* field_name = field->as_C_string();
const char* loader1 = SystemDictionary::loader_name(ref_loader());
char* sel = InstanceKlass::cast(sel_klass())->name()->as_C_string();
const char* loader2 = SystemDictionary::loader_name(sel_loader());
char* failed_type_name = failed_type_symbol->as_C_string();
size_t buflen = strlen(msg) + strlen(field_name) + strlen(loader1) +
strlen(sel) + strlen(loader2) + strlen(failed_type_name) + 1;
char* buf = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, buflen);
jio_snprintf(buf, buflen, msg, field_name, loader1, sel, loader2,
failed_type_name);
THROW_MSG(vmSymbols::java_lang_LinkageError(), buf);
}
}
}
// return information. note that the klass is set to the actual klass containing the
// field, otherwise access of static fields in superclasses will not work.
}
//------------------------------------------------------------------------------------------------------------------------
// Invoke resolution
//
// Naming conventions:
//
// resolved_method the specified method (i.e., static receiver specified via constant pool index)
// sel_method the selected method (selected via run-time lookup; e.g., based on dynamic receiver class)
// resolved_klass the specified klass (i.e., specified via constant pool index)
// recv_klass the receiver klass
void LinkResolver::resolve_static_call(CallInfo& result, KlassHandle& resolved_klass, Symbol* method_name,
Symbol* method_signature, KlassHandle current_klass,
bool check_access, bool initialize_class, TRAPS) {
methodHandle resolved_method;
linktime_resolve_static_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK);
resolved_klass = KlassHandle(THREAD, resolved_method->method_holder());
// Initialize klass (this should only happen if everything is ok)
if (initialize_class && resolved_klass->should_be_initialized()) {
resolved_klass->initialize(CHECK);
linktime_resolve_static_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK);
}
// setup result
result.set_static(resolved_klass, resolved_method, CHECK);
}
// throws linktime exceptions
void LinkResolver::linktime_resolve_static_method(methodHandle& resolved_method, KlassHandle resolved_klass,
Symbol* method_name, Symbol* method_signature,
KlassHandle current_klass, bool check_access, TRAPS) {
if (!resolved_klass->is_interface()) {
resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, false, CHECK);
} else {
resolve_interface_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, false, CHECK);
}
assert(resolved_method->name() != vmSymbols::class_initializer_name(), "should have been checked in verifier");
// check if static
if (!resolved_method->is_static()) {
ResourceMark rm(THREAD);
char buf[200];
jio_snprintf(buf, sizeof(buf), "Expected static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
resolved_method->name(),
resolved_method->signature()));
THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
}
}
void LinkResolver::resolve_special_call(CallInfo& result, KlassHandle resolved_klass, Symbol* method_name,
Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS) {
methodHandle resolved_method;
linktime_resolve_special_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK);
runtime_resolve_special_method(result, resolved_method, resolved_klass, current_klass, check_access, CHECK);
}
// throws linktime exceptions
void LinkResolver::linktime_resolve_special_method(methodHandle& resolved_method, KlassHandle resolved_klass,
Symbol* method_name, Symbol* method_signature,
KlassHandle current_klass, bool check_access, TRAPS) {
// Invokespecial is called for multiple special reasons:
// <init>
// local private method invocation, for classes and interfaces
// superclass.method, which can also resolve to a default method
// and the selected method is recalculated relative to the direct superclass
// superinterface.method, which explicitly does not check shadowing
if (!resolved_klass->is_interface()) {
resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, false, CHECK);
} else {
resolve_interface_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, true, CHECK);
}
// check if method name is <init>, that it is found in same klass as static type
if (resolved_method->name() == vmSymbols::object_initializer_name() &&
resolved_method->method_holder() != resolved_klass()) {
ResourceMark rm(THREAD);
Exceptions::fthrow(
THREAD_AND_LOCATION,
vmSymbols::java_lang_NoSuchMethodError(),
"%s: method %s%s not found",
resolved_klass->external_name(),
resolved_method->name()->as_C_string(),
resolved_method->signature()->as_C_string()
);
return;
}
// check if invokespecial's interface method reference is in an indirect superinterface
if (!current_klass.is_null() && resolved_klass->is_interface()) {
Klass *klass_to_check = !InstanceKlass::cast(current_klass())->is_anonymous() ?
current_klass() :
InstanceKlass::cast(current_klass())->host_klass();
// As of the fix for 4486457 we disable verification for all of the
// dynamically-generated bytecodes associated with the 1.4
// reflection implementation, not just those associated with
// sun/reflect/SerializationConstructorAccessor.
bool is_reflect = JDK_Version::is_gte_jdk14x_version() &&
UseNewReflection &&
klass_to_check->is_subclass_of(
SystemDictionary::reflect_MagicAccessorImpl_klass());
if (!is_reflect &&
!InstanceKlass::cast(klass_to_check)->is_same_or_direct_interface(resolved_klass())) {
ResourceMark rm(THREAD);
char buf[200];
jio_snprintf(buf, sizeof(buf),
"Interface method reference: %s, is in an indirect superinterface of %s",
Method::name_and_sig_as_C_string(resolved_klass(),
resolved_method->name(),
resolved_method->signature()),
current_klass->external_name());
THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
}
}
// check if not static
if (resolved_method->is_static()) {
ResourceMark rm(THREAD);
char buf[200];
jio_snprintf(buf, sizeof(buf),
"Expecting non-static method %s",
Method::name_and_sig_as_C_string(resolved_klass(),
resolved_method->name(),
resolved_method->signature()));
THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
}
if (TraceItables && Verbose) {
ResourceMark rm(THREAD);
tty->print("invokespecial resolved method: caller-class:%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
(current_klass.is_null() ? "<NULL>" : current_klass->internal_name()),
(resolved_klass.is_null() ? "<NULL>" : resolved_klass->internal_name()),
Method::name_and_sig_as_C_string(resolved_klass(),
resolved_method->name(),
resolved_method->signature()),
resolved_method->method_holder()->internal_name()
);
resolved_method->access_flags().print_on(tty);
if (resolved_method->is_default_method()) {
tty->print("default ");
}
if (resolved_method->is_overpass()) {
tty->print("overpass");
}
tty->cr();
}
}
// throws runtime exceptions
void LinkResolver::runtime_resolve_special_method(CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass,
KlassHandle current_klass, bool check_access, TRAPS) {
// resolved method is selected method unless we have an old-style lookup
// for a superclass method
// Invokespecial for a superinterface, resolved method is selected method,
// no checks for shadowing
methodHandle sel_method(THREAD, resolved_method());
// check if this is an old-style super call and do a new lookup if so
{ KlassHandle method_klass = KlassHandle(THREAD,
resolved_method->method_holder());
if (check_access &&
// a) check if ACC_SUPER flag is set for the current class
(current_klass->is_super() || !AllowNonVirtualCalls) &&
// b) check if the class of the resolved_klass is a superclass
// (not supertype in order to exclude interface classes) of the current class.
// This check is not performed for super.invoke for interface methods
// in super interfaces.
current_klass->is_subclass_of(resolved_klass()) &&
current_klass() != resolved_klass() &&
// c) check if the method is not <init>
resolved_method->name() != vmSymbols::object_initializer_name()) {
// Lookup super method
KlassHandle super_klass(THREAD, current_klass->super());
lookup_instance_method_in_klasses(sel_method, super_klass,
resolved_method->name(),
resolved_method->signature(), CHECK);
// check if found
if (sel_method.is_null()) {
ResourceMark rm(THREAD);
THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
Method::name_and_sig_as_C_string(resolved_klass(),
resolved_method->name(),
resolved_method->signature()));
}
}
}
// check if not static
if (sel_method->is_static()) {
ResourceMark rm(THREAD);
char buf[200];
jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
resolved_method->name(),
resolved_method->signature()));
THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
}
// check if abstract
if (sel_method->is_abstract()) {
ResourceMark rm(THREAD);
THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
Method::name_and_sig_as_C_string(resolved_klass(),
sel_method->name(),
sel_method->signature()));
}
if (TraceItables && Verbose) {
ResourceMark rm(THREAD);
tty->print("invokespecial selected method: resolved-class:%s, method:%s, method_holder:%s, access_flags: ",
(resolved_klass.is_null() ? "<NULL>" : resolved_klass->internal_name()),
Method::name_and_sig_as_C_string(resolved_klass(),
sel_method->name(),
sel_method->signature()),
sel_method->method_holder()->internal_name()
);
sel_method->access_flags().print_on(tty);
if (sel_method->is_default_method()) {
tty->print("default ");
}
if (sel_method->is_overpass()) {
tty->print("overpass");
}
tty->cr();
}
// setup result
result.set_static(resolved_klass, sel_method, CHECK);
}
void LinkResolver::resolve_virtual_call(CallInfo& result, Handle recv, KlassHandle receiver_klass, KlassHandle resolved_klass,
Symbol* method_name, Symbol* method_signature, KlassHandle current_klass,
bool check_access, bool check_null_and_abstract, TRAPS) {
methodHandle resolved_method;
linktime_resolve_virtual_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK);
runtime_resolve_virtual_method(result, resolved_method, resolved_klass, recv, receiver_klass, check_null_and_abstract, CHECK);
}
// throws linktime exceptions
void LinkResolver::linktime_resolve_virtual_method(methodHandle &resolved_method, KlassHandle resolved_klass,
Symbol* method_name, Symbol* method_signature,
KlassHandle current_klass, bool check_access, TRAPS) {
// normal method resolution
resolve_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, true, CHECK);
assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
// check if private interface method
if (resolved_klass->is_interface() && resolved_method->is_private()) {
ResourceMark rm(THREAD);
char buf[200];
jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokevirtual: method %s, caller-class:%s",
Method::name_and_sig_as_C_string(resolved_klass(),
resolved_method->name(),
resolved_method->signature()),
(current_klass.is_null() ? "<NULL>" : current_klass->internal_name()));
THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
}
// check if not static
if (resolved_method->is_static()) {
ResourceMark rm(THREAD);
char buf[200];
jio_snprintf(buf, sizeof(buf), "Expecting non-static method %s", Method::name_and_sig_as_C_string(resolved_klass(),
resolved_method->name(),
resolved_method->signature()));
THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
}
if (PrintVtables && Verbose) {
ResourceMark rm(THREAD);
tty->print("invokevirtual resolved method: caller-class:%s, compile-time-class:%s, method:%s, method_holder:%s, access_flags: ",
(current_klass.is_null() ? "<NULL>" : current_klass->internal_name()),
(resolved_klass.is_null() ? "<NULL>" : resolved_klass->internal_name()),
Method::name_and_sig_as_C_string(resolved_klass(),
resolved_method->name(),
resolved_method->signature()),
resolved_method->method_holder()->internal_name()
);
resolved_method->access_flags().print_on(tty);
if (resolved_method->is_default_method()) {
tty->print("default ");
}
if (resolved_method->is_overpass()) {
tty->print("overpass");
}
tty->cr();
}
}
// throws runtime exceptions
void LinkResolver::runtime_resolve_virtual_method(CallInfo& result,
methodHandle resolved_method,
KlassHandle resolved_klass,
Handle recv,
KlassHandle recv_klass,
bool check_null_and_abstract,
TRAPS) {
// setup default return values
int vtable_index = Method::invalid_vtable_index;
methodHandle selected_method;
assert(recv.is_null() || recv->is_oop(), "receiver is not an oop");
// runtime method resolution
if (check_null_and_abstract && recv.is_null()) { // check if receiver exists
THROW(vmSymbols::java_lang_NullPointerException());
}
// Virtual methods cannot be resolved before its klass has been linked, for otherwise the Method*'s
// has not been rewritten, and the vtable initialized. Make sure to do this after the nullcheck, since
// a missing receiver might result in a bogus lookup.
assert(resolved_method->method_holder()->is_linked(), "must be linked");
// do lookup based on receiver klass using the vtable index
if (resolved_method->method_holder()->is_interface()) { // miranda method
vtable_index = vtable_index_of_interface_method(resolved_klass,
resolved_method);
assert(vtable_index >= 0 , "we should have valid vtable index at this point");
InstanceKlass* inst = InstanceKlass::cast(recv_klass());
selected_method = methodHandle(THREAD, inst->method_at_vtable(vtable_index));
} else {
// at this point we are sure that resolved_method is virtual and not
// a miranda method; therefore, it must have a valid vtable index.
assert(!resolved_method->has_itable_index(), "");
vtable_index = resolved_method->vtable_index();
// We could get a negative vtable_index for final methods,
// because as an optimization they are they are never put in the vtable,
// unless they override an existing method.
// If we do get a negative, it means the resolved method is the the selected
// method, and it can never be changed by an override.
if (vtable_index == Method::nonvirtual_vtable_index) {
assert(resolved_method->can_be_statically_bound(), "cannot override this method");
selected_method = resolved_method;
} else {
// recv_klass might be an arrayKlassOop but all vtables start at
// the same place. The cast is to avoid virtual call and assertion.
InstanceKlass* inst = (InstanceKlass*)recv_klass();
selected_method = methodHandle(THREAD, inst->method_at_vtable(vtable_index));
}
}
// check if method exists
if (selected_method.is_null()) {
ResourceMark rm(THREAD);
THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
Method::name_and_sig_as_C_string(resolved_klass(),
resolved_method->name(),
resolved_method->signature()));
}
// check if abstract
if (check_null_and_abstract && selected_method->is_abstract()) {
ResourceMark rm(THREAD);
THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
Method::name_and_sig_as_C_string(resolved_klass(),
selected_method->name(),
selected_method->signature()));
}
if (PrintVtables && Verbose) {
ResourceMark rm(THREAD);
tty->print("invokevirtual selected method: receiver-class:%s, resolved-class:%s, method:%s, method_holder:%s, vtable_index:%d, access_flags: ",
(recv_klass.is_null() ? "<NULL>" : recv_klass->internal_name()),
(resolved_klass.is_null() ? "<NULL>" : resolved_klass->internal_name()),
Method::name_and_sig_as_C_string(resolved_klass(),
resolved_method->name(),
resolved_method->signature()),
selected_method->method_holder()->internal_name(),
vtable_index
);
selected_method->access_flags().print_on(tty);
if (selected_method->is_default_method()) {
tty->print("default ");
}
if (selected_method->is_overpass()) {
tty->print("overpass");
}
tty->cr();
}
// setup result
result.set_virtual(resolved_klass, recv_klass, resolved_method, selected_method, vtable_index, CHECK);
}
void LinkResolver::resolve_interface_call(CallInfo& result, Handle recv, KlassHandle recv_klass, KlassHandle resolved_klass,
Symbol* method_name, Symbol* method_signature, KlassHandle current_klass,
bool check_access, bool check_null_and_abstract, TRAPS) {
methodHandle resolved_method;
linktime_resolve_interface_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, CHECK);
runtime_resolve_interface_method(result, resolved_method, resolved_klass, recv, recv_klass, check_null_and_abstract, CHECK);
}
// throws linktime exceptions
void LinkResolver::linktime_resolve_interface_method(methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name,
Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS) {
// normal interface method resolution
resolve_interface_method(resolved_method, resolved_klass, method_name, method_signature, current_klass, check_access, true, CHECK);
assert(resolved_method->name() != vmSymbols::object_initializer_name(), "should have been checked in verifier");
assert(resolved_method->name() != vmSymbols::class_initializer_name (), "should have been checked in verifier");
}
// throws runtime exceptions
void LinkResolver::runtime_resolve_interface_method(CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass,
Handle recv, KlassHandle recv_klass, bool check_null_and_abstract, TRAPS) {
// check if receiver exists
if (check_null_and_abstract && recv.is_null()) {
THROW(vmSymbols::java_lang_NullPointerException());
}
// check if private interface method
if (resolved_klass->is_interface() && resolved_method->is_private()) {
ResourceMark rm(THREAD);
char buf[200];
jio_snprintf(buf, sizeof(buf), "private interface method requires invokespecial, not invokeinterface: method %s",
Method::name_and_sig_as_C_string(resolved_klass(),
resolved_method->name(),
resolved_method->signature()));
THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
}
// check if receiver klass implements the resolved interface
if (!recv_klass->is_subtype_of(resolved_klass())) {
ResourceMark rm(THREAD);
char buf[200];
jio_snprintf(buf, sizeof(buf), "Class %s does not implement the requested interface %s",
recv_klass()->external_name(),
resolved_klass()->external_name());
THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), buf);
}
// do lookup based on receiver klass
methodHandle sel_method;
// This search must match the linktime preparation search for itable initialization
// to correctly enforce loader constraints for interface method inheritance
lookup_instance_method_in_klasses(sel_method, recv_klass,
resolved_method->name(),
resolved_method->signature(), CHECK);
if (sel_method.is_null() && !check_null_and_abstract) {
// In theory this is a harmless placeholder value, but
// in practice leaving in null affects the nsk default method tests.
// This needs further study.
sel_method = resolved_method;
}
// check if method exists
if (sel_method.is_null()) {
ResourceMark rm(THREAD);
THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
Method::name_and_sig_as_C_string(recv_klass(),
resolved_method->name(),
resolved_method->signature()));
}
// check access
// Throw Illegal Access Error if sel_method is not public.
if (!sel_method->is_public()) {
ResourceMark rm(THREAD);
THROW_MSG(vmSymbols::java_lang_IllegalAccessError(),
Method::name_and_sig_as_C_string(recv_klass(),
sel_method->name(),
sel_method->signature()));
}
// check if abstract
if (check_null_and_abstract && sel_method->is_abstract()) {
ResourceMark rm(THREAD);
THROW_MSG(vmSymbols::java_lang_AbstractMethodError(),
Method::name_and_sig_as_C_string(recv_klass(),
sel_method->name(),
sel_method->signature()));
}
if (TraceItables && Verbose) {
ResourceMark rm(THREAD);
tty->print("invokeinterface selected method: receiver-class:%s, resolved-class:%s, method:%s, method_holder:%s, access_flags: ",
(recv_klass.is_null() ? "<NULL>" : recv_klass->internal_name()),
(resolved_klass.is_null() ? "<NULL>" : resolved_klass->internal_name()),
Method::name_and_sig_as_C_string(resolved_klass(),
resolved_method->name(),
resolved_method->signature()),
sel_method->method_holder()->internal_name()
);
sel_method->access_flags().print_on(tty);
if (sel_method->is_default_method()) {
tty->print("default ");
}
if (sel_method->is_overpass()) {
tty->print("overpass");
}
tty->cr();
}
// setup result
if (!resolved_method->has_itable_index()) {
int vtable_index = resolved_method->vtable_index();
assert(vtable_index == sel_method->vtable_index(), "sanity check");
result.set_virtual(resolved_klass, recv_klass, resolved_method, sel_method, vtable_index, CHECK);
} else {
int itable_index = resolved_method()->itable_index();
result.set_interface(resolved_klass, recv_klass, resolved_method, sel_method, itable_index, CHECK);
}
}
methodHandle LinkResolver::linktime_resolve_interface_method_or_null(
KlassHandle resolved_klass,
Symbol* method_name,
Symbol* method_signature,
KlassHandle current_klass,
bool check_access) {
EXCEPTION_MARK;
methodHandle method_result;
linktime_resolve_interface_method(method_result, resolved_klass, method_name, method_signature, current_klass, check_access, THREAD);
if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION;
return methodHandle();
} else {
return method_result;
}
}
methodHandle LinkResolver::linktime_resolve_virtual_method_or_null(
KlassHandle resolved_klass,
Symbol* method_name,
Symbol* method_signature,
KlassHandle current_klass,
bool check_access) {
EXCEPTION_MARK;
methodHandle method_result;
linktime_resolve_virtual_method(method_result, resolved_klass, method_name, method_signature, current_klass, check_access, THREAD);
if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION;
return methodHandle();
} else {
return method_result;
}
}
methodHandle LinkResolver::resolve_virtual_call_or_null(
KlassHandle receiver_klass,
KlassHandle resolved_klass,
Symbol* name,
Symbol* signature,
KlassHandle current_klass) {
EXCEPTION_MARK;
CallInfo info;
resolve_virtual_call(info, Handle(), receiver_klass, resolved_klass, name, signature, current_klass, true, false, THREAD);
if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION;
return methodHandle();
}
return info.selected_method();
}
methodHandle LinkResolver::resolve_interface_call_or_null(
KlassHandle receiver_klass,
KlassHandle resolved_klass,
Symbol* name,
Symbol* signature,
KlassHandle current_klass) {
EXCEPTION_MARK;
CallInfo info;
resolve_interface_call(info, Handle(), receiver_klass, resolved_klass, name, signature, current_klass, true, false, THREAD);
if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION;
return methodHandle();
}
return info.selected_method();
}
int LinkResolver::resolve_virtual_vtable_index(
KlassHandle receiver_klass,
KlassHandle resolved_klass,
Symbol* name,
Symbol* signature,
KlassHandle current_klass) {
EXCEPTION_MARK;
CallInfo info;
resolve_virtual_call(info, Handle(), receiver_klass, resolved_klass, name, signature, current_klass, true, false, THREAD);
if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION;
return Method::invalid_vtable_index;
}
return info.vtable_index();
}
methodHandle LinkResolver::resolve_static_call_or_null(
KlassHandle resolved_klass,
Symbol* name,
Symbol* signature,
KlassHandle current_klass) {
EXCEPTION_MARK;
CallInfo info;
resolve_static_call(info, resolved_klass, name, signature, current_klass, true, false, THREAD);
if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION;
return methodHandle();
}
return info.selected_method();
}
methodHandle LinkResolver::resolve_special_call_or_null(KlassHandle resolved_klass, Symbol* name, Symbol* signature,
KlassHandle current_klass) {
EXCEPTION_MARK;
CallInfo info;
resolve_special_call(info, resolved_klass, name, signature, current_klass, true, THREAD);
if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION;
return methodHandle();
}
return info.selected_method();
}
//------------------------------------------------------------------------------------------------------------------------
// ConstantPool entries
void LinkResolver::resolve_invoke(CallInfo& result, Handle recv, constantPoolHandle pool, int index, Bytecodes::Code byte, TRAPS) {
switch (byte) {
case Bytecodes::_invokestatic : resolve_invokestatic (result, pool, index, CHECK); break;
case Bytecodes::_invokespecial : resolve_invokespecial (result, pool, index, CHECK); break;
case Bytecodes::_invokevirtual : resolve_invokevirtual (result, recv, pool, index, CHECK); break;
case Bytecodes::_invokehandle : resolve_invokehandle (result, pool, index, CHECK); break;
case Bytecodes::_invokedynamic : resolve_invokedynamic (result, pool, index, CHECK); break;
case Bytecodes::_invokeinterface: resolve_invokeinterface(result, recv, pool, index, CHECK); break;
}
return;
}
void LinkResolver::resolve_pool(KlassHandle& resolved_klass, Symbol*& method_name, Symbol*& method_signature,
KlassHandle& current_klass, constantPoolHandle pool, int index, TRAPS) {
// resolve klass
resolve_klass(resolved_klass, pool, index, CHECK);
// Get name, signature, and static klass
method_name = pool->name_ref_at(index);
method_signature = pool->signature_ref_at(index);
current_klass = KlassHandle(THREAD, pool->pool_holder());
}
void LinkResolver::resolve_invokestatic(CallInfo& result, constantPoolHandle pool, int index, TRAPS) {
KlassHandle resolved_klass;
Symbol* method_name = NULL;
Symbol* method_signature = NULL;
KlassHandle current_klass;
resolve_pool(resolved_klass, method_name, method_signature, current_klass, pool, index, CHECK);
resolve_static_call(result, resolved_klass, method_name, method_signature, current_klass, true, true, CHECK);
}
void LinkResolver::resolve_invokespecial(CallInfo& result, constantPoolHandle pool, int index, TRAPS) {
KlassHandle resolved_klass;
Symbol* method_name = NULL;
Symbol* method_signature = NULL;
KlassHandle current_klass;
resolve_pool(resolved_klass, method_name, method_signature, current_klass, pool, index, CHECK);
resolve_special_call(result, resolved_klass, method_name, method_signature, current_klass, true, CHECK);
}
void LinkResolver::resolve_invokevirtual(CallInfo& result, Handle recv,
constantPoolHandle pool, int index,
TRAPS) {
KlassHandle resolved_klass;
Symbol* method_name = NULL;
Symbol* method_signature = NULL;
KlassHandle current_klass;
resolve_pool(resolved_klass, method_name, method_signature, current_klass, pool, index, CHECK);
KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
resolve_virtual_call(result, recv, recvrKlass, resolved_klass, method_name, method_signature, current_klass, true, true, CHECK);
}
void LinkResolver::resolve_invokeinterface(CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS) {
KlassHandle resolved_klass;
Symbol* method_name = NULL;
Symbol* method_signature = NULL;
KlassHandle current_klass;
resolve_pool(resolved_klass, method_name, method_signature, current_klass, pool, index, CHECK);
KlassHandle recvrKlass (THREAD, recv.is_null() ? (Klass*)NULL : recv->klass());
resolve_interface_call(result, recv, recvrKlass, resolved_klass, method_name, method_signature, current_klass, true, true, CHECK);
}
void LinkResolver::resolve_invokehandle(CallInfo& result, constantPoolHandle pool, int index, TRAPS) {
assert(EnableInvokeDynamic, "");
// This guy is reached from InterpreterRuntime::resolve_invokehandle.
KlassHandle resolved_klass;
Symbol* method_name = NULL;
Symbol* method_signature = NULL;
KlassHandle current_klass;
resolve_pool(resolved_klass, method_name, method_signature, current_klass, pool, index, CHECK);
if (TraceMethodHandles) {
ResourceMark rm(THREAD);
tty->print_cr("resolve_invokehandle %s %s", method_name->as_C_string(), method_signature->as_C_string());
}
resolve_handle_call(result, resolved_klass, method_name, method_signature, current_klass, CHECK);
}
void LinkResolver::resolve_handle_call(CallInfo& result, KlassHandle resolved_klass,
Symbol* method_name, Symbol* method_signature,
KlassHandle current_klass,
TRAPS) {
// JSR 292: this must be an implicitly generated method MethodHandle.invokeExact(*...) or similar
assert(resolved_klass() == SystemDictionary::MethodHandle_klass(), "");
assert(MethodHandles::is_signature_polymorphic_name(method_name), "");
methodHandle resolved_method;
Handle resolved_appendix;
Handle resolved_method_type;
lookup_polymorphic_method(resolved_method, resolved_klass,
method_name, method_signature,
current_klass, &resolved_appendix, &resolved_method_type, CHECK);
result.set_handle(resolved_method, resolved_appendix, resolved_method_type, CHECK);
}
void LinkResolver::resolve_invokedynamic(CallInfo& result, constantPoolHandle pool, int index, TRAPS) {
assert(EnableInvokeDynamic, "");
//resolve_pool(<resolved_klass>, method_name, method_signature, current_klass, pool, index, CHECK);
Symbol* method_name = pool->name_ref_at(index);
Symbol* method_signature = pool->signature_ref_at(index);
KlassHandle current_klass = KlassHandle(THREAD, pool->pool_holder());
// Resolve the bootstrap specifier (BSM + optional arguments).
Handle bootstrap_specifier;
// Check if CallSite has been bound already:
ConstantPoolCacheEntry* cpce = pool->invokedynamic_cp_cache_entry_at(index);
if (cpce->is_f1_null()) {
int pool_index = cpce->constant_pool_index();
oop bsm_info = pool->resolve_bootstrap_specifier_at(pool_index, CHECK);
assert(bsm_info != NULL, "");
// FIXME: Cache this once per BootstrapMethods entry, not once per CONSTANT_InvokeDynamic.
bootstrap_specifier = Handle(THREAD, bsm_info);
}
if (!cpce->is_f1_null()) {
methodHandle method( THREAD, cpce->f1_as_method());
Handle appendix( THREAD, cpce->appendix_if_resolved(pool));
Handle method_type(THREAD, cpce->method_type_if_resolved(pool));
result.set_handle(method, appendix, method_type, CHECK);
return;
}
if (TraceMethodHandles) {
ResourceMark rm(THREAD);
tty->print_cr("resolve_invokedynamic #%d %s %s",
ConstantPool::decode_invokedynamic_index(index),
method_name->as_C_string(), method_signature->as_C_string());
tty->print(" BSM info: "); bootstrap_specifier->print();
}
resolve_dynamic_call(result, bootstrap_specifier, method_name, method_signature, current_klass, CHECK);
}
void LinkResolver::resolve_dynamic_call(CallInfo& result,
Handle bootstrap_specifier,
Symbol* method_name, Symbol* method_signature,
KlassHandle current_klass,
TRAPS) {
// JSR 292: this must resolve to an implicitly generated method MH.linkToCallSite(*...)
// The appendix argument is likely to be a freshly-created CallSite.
Handle resolved_appendix;
Handle resolved_method_type;
methodHandle resolved_method =
SystemDictionary::find_dynamic_call_site_invoker(current_klass,
bootstrap_specifier,
method_name, method_signature,
&resolved_appendix,
&resolved_method_type,
THREAD);
if (HAS_PENDING_EXCEPTION) {
if (TraceMethodHandles) {
tty->print_cr("invokedynamic throws BSME for "INTPTR_FORMAT, (void *)PENDING_EXCEPTION);
PENDING_EXCEPTION->print();
}
if (PENDING_EXCEPTION->is_a(SystemDictionary::BootstrapMethodError_klass())) {
// throw these guys, since they are already wrapped
return;
}
if (!PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) {
// intercept only LinkageErrors which might have failed to wrap
return;
}
// See the "Linking Exceptions" section for the invokedynamic instruction in the JVMS.
Handle nested_exception(THREAD, PENDING_EXCEPTION);
CLEAR_PENDING_EXCEPTION;
THROW_CAUSE(vmSymbols::java_lang_BootstrapMethodError(), nested_exception)
}
result.set_handle(resolved_method, resolved_appendix, resolved_method_type, CHECK);
}
//------------------------------------------------------------------------------------------------------------------------
#ifndef PRODUCT
void CallInfo::print() {
ResourceMark rm;
const char* kindstr = "unknown";
switch (_call_kind) {
case direct_call: kindstr = "direct"; break;
case vtable_call: kindstr = "vtable"; break;
case itable_call: kindstr = "itable"; break;
}
tty->print_cr("Call %s@%d %s", kindstr, _call_index,
_resolved_method.is_null() ? "(none)" : _resolved_method->name_and_sig_as_C_string());
}
#endif
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