Java example source code file (interpreterRuntime.cpp)
The interpreterRuntime.cpp Java example source code
/*
* Copyright (c) 1997, 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
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* questions.
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*/
#include "precompiled.hpp"
#include "classfile/systemDictionary.hpp"
#include "classfile/vmSymbols.hpp"
#include "compiler/compileBroker.hpp"
#include "compiler/disassembler.hpp"
#include "gc_interface/collectedHeap.hpp"
#include "interpreter/interpreter.hpp"
#include "interpreter/interpreterRuntime.hpp"
#include "interpreter/linkResolver.hpp"
#include "interpreter/templateTable.hpp"
#include "memory/oopFactory.hpp"
#include "memory/universe.inline.hpp"
#include "oops/constantPool.hpp"
#include "oops/instanceKlass.hpp"
#include "oops/methodData.hpp"
#include "oops/objArrayKlass.hpp"
#include "oops/oop.inline.hpp"
#include "oops/symbol.hpp"
#include "prims/jvmtiExport.hpp"
#include "prims/nativeLookup.hpp"
#include "runtime/biasedLocking.hpp"
#include "runtime/compilationPolicy.hpp"
#include "runtime/deoptimization.hpp"
#include "runtime/fieldDescriptor.hpp"
#include "runtime/handles.inline.hpp"
#include "runtime/interfaceSupport.hpp"
#include "runtime/java.hpp"
#include "runtime/jfieldIDWorkaround.hpp"
#include "runtime/osThread.hpp"
#include "runtime/sharedRuntime.hpp"
#include "runtime/stubRoutines.hpp"
#include "runtime/synchronizer.hpp"
#include "runtime/threadCritical.hpp"
#include "utilities/events.hpp"
#ifdef TARGET_ARCH_x86
# include "vm_version_x86.hpp"
#endif
#ifdef TARGET_ARCH_sparc
# include "vm_version_sparc.hpp"
#endif
#ifdef TARGET_ARCH_zero
# include "vm_version_zero.hpp"
#endif
#ifdef TARGET_ARCH_arm
# include "vm_version_arm.hpp"
#endif
#ifdef TARGET_ARCH_ppc
# include "vm_version_ppc.hpp"
#endif
#ifdef COMPILER2
#include "opto/runtime.hpp"
#endif
class UnlockFlagSaver {
private:
JavaThread* _thread;
bool _do_not_unlock;
public:
UnlockFlagSaver(JavaThread* t) {
_thread = t;
_do_not_unlock = t->do_not_unlock_if_synchronized();
t->set_do_not_unlock_if_synchronized(false);
}
~UnlockFlagSaver() {
_thread->set_do_not_unlock_if_synchronized(_do_not_unlock);
}
};
//------------------------------------------------------------------------------------------------------------------------
// State accessors
void InterpreterRuntime::set_bcp_and_mdp(address bcp, JavaThread *thread) {
last_frame(thread).interpreter_frame_set_bcp(bcp);
if (ProfileInterpreter) {
// ProfileTraps uses MDOs independently of ProfileInterpreter.
// That is why we must check both ProfileInterpreter and mdo != NULL.
MethodData* mdo = last_frame(thread).interpreter_frame_method()->method_data();
if (mdo != NULL) {
NEEDS_CLEANUP;
last_frame(thread).interpreter_frame_set_mdp(mdo->bci_to_dp(last_frame(thread).interpreter_frame_bci()));
}
}
}
//------------------------------------------------------------------------------------------------------------------------
// Constants
IRT_ENTRY(void, InterpreterRuntime::ldc(JavaThread* thread, bool wide))
// access constant pool
ConstantPool* pool = method(thread)->constants();
int index = wide ? get_index_u2(thread, Bytecodes::_ldc_w) : get_index_u1(thread, Bytecodes::_ldc);
constantTag tag = pool->tag_at(index);
assert (tag.is_unresolved_klass() || tag.is_klass(), "wrong ldc call");
Klass* klass = pool->klass_at(index, CHECK);
oop java_class = klass->java_mirror();
thread->set_vm_result(java_class);
IRT_END
IRT_ENTRY(void, InterpreterRuntime::resolve_ldc(JavaThread* thread, Bytecodes::Code bytecode)) {
assert(bytecode == Bytecodes::_fast_aldc ||
bytecode == Bytecodes::_fast_aldc_w, "wrong bc");
ResourceMark rm(thread);
methodHandle m (thread, method(thread));
Bytecode_loadconstant ldc(m, bci(thread));
oop result = ldc.resolve_constant(CHECK);
#ifdef ASSERT
{
// The bytecode wrappers aren't GC-safe so construct a new one
Bytecode_loadconstant ldc2(m, bci(thread));
oop coop = m->constants()->resolved_references()->obj_at(ldc2.cache_index());
assert(result == coop, "expected result for assembly code");
}
#endif
thread->set_vm_result(result);
}
IRT_END
//------------------------------------------------------------------------------------------------------------------------
// Allocation
IRT_ENTRY(void, InterpreterRuntime::_new(JavaThread* thread, ConstantPool* pool, int index))
Klass* k_oop = pool->klass_at(index, CHECK);
instanceKlassHandle klass (THREAD, k_oop);
// Make sure we are not instantiating an abstract klass
klass->check_valid_for_instantiation(true, CHECK);
// Make sure klass is initialized
klass->initialize(CHECK);
// At this point the class may not be fully initialized
// because of recursive initialization. If it is fully
// initialized & has_finalized is not set, we rewrite
// it into its fast version (Note: no locking is needed
// here since this is an atomic byte write and can be
// done more than once).
//
// Note: In case of classes with has_finalized we don't
// rewrite since that saves us an extra check in
// the fast version which then would call the
// slow version anyway (and do a call back into
// Java).
// If we have a breakpoint, then we don't rewrite
// because the _breakpoint bytecode would be lost.
oop obj = klass->allocate_instance(CHECK);
thread->set_vm_result(obj);
IRT_END
IRT_ENTRY(void, InterpreterRuntime::newarray(JavaThread* thread, BasicType type, jint size))
oop obj = oopFactory::new_typeArray(type, size, CHECK);
thread->set_vm_result(obj);
IRT_END
IRT_ENTRY(void, InterpreterRuntime::anewarray(JavaThread* thread, ConstantPool* pool, int index, jint size))
// Note: no oopHandle for pool & klass needed since they are not used
// anymore after new_objArray() and no GC can happen before.
// (This may have to change if this code changes!)
Klass* klass = pool->klass_at(index, CHECK);
objArrayOop obj = oopFactory::new_objArray(klass, size, CHECK);
thread->set_vm_result(obj);
IRT_END
IRT_ENTRY(void, InterpreterRuntime::multianewarray(JavaThread* thread, jint* first_size_address))
// We may want to pass in more arguments - could make this slightly faster
ConstantPool* constants = method(thread)->constants();
int i = get_index_u2(thread, Bytecodes::_multianewarray);
Klass* klass = constants->klass_at(i, CHECK);
int nof_dims = number_of_dimensions(thread);
assert(klass->is_klass(), "not a class");
assert(nof_dims >= 1, "multianewarray rank must be nonzero");
// We must create an array of jints to pass to multi_allocate.
ResourceMark rm(thread);
const int small_dims = 10;
jint dim_array[small_dims];
jint *dims = &dim_array[0];
if (nof_dims > small_dims) {
dims = (jint*) NEW_RESOURCE_ARRAY(jint, nof_dims);
}
for (int index = 0; index < nof_dims; index++) {
// offset from first_size_address is addressed as local[index]
int n = Interpreter::local_offset_in_bytes(index)/jintSize;
dims[index] = first_size_address[n];
}
oop obj = ArrayKlass::cast(klass)->multi_allocate(nof_dims, dims, CHECK);
thread->set_vm_result(obj);
IRT_END
IRT_ENTRY(void, InterpreterRuntime::register_finalizer(JavaThread* thread, oopDesc* obj))
assert(obj->is_oop(), "must be a valid oop");
assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
IRT_END
// Quicken instance-of and check-cast bytecodes
IRT_ENTRY(void, InterpreterRuntime::quicken_io_cc(JavaThread* thread))
// Force resolving; quicken the bytecode
int which = get_index_u2(thread, Bytecodes::_checkcast);
ConstantPool* cpool = method(thread)->constants();
// We'd expect to assert that we're only here to quicken bytecodes, but in a multithreaded
// program we might have seen an unquick'd bytecode in the interpreter but have another
// thread quicken the bytecode before we get here.
// assert( cpool->tag_at(which).is_unresolved_klass(), "should only come here to quicken bytecodes" );
Klass* klass = cpool->klass_at(which, CHECK);
thread->set_vm_result_2(klass);
IRT_END
//------------------------------------------------------------------------------------------------------------------------
// Exceptions
// Assume the compiler is (or will be) interested in this event.
// If necessary, create an MDO to hold the information, and record it.
void InterpreterRuntime::note_trap(JavaThread* thread, int reason, TRAPS) {
assert(ProfileTraps, "call me only if profiling");
methodHandle trap_method(thread, method(thread));
if (trap_method.not_null()) {
MethodData* trap_mdo = trap_method->method_data();
if (trap_mdo == NULL) {
Method::build_interpreter_method_data(trap_method, THREAD);
if (HAS_PENDING_EXCEPTION) {
assert((PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())), "we expect only an OOM error here");
CLEAR_PENDING_EXCEPTION;
}
trap_mdo = trap_method->method_data();
// and fall through...
}
if (trap_mdo != NULL) {
// Update per-method count of trap events. The interpreter
// is updating the MDO to simulate the effect of compiler traps.
int trap_bci = trap_method->bci_from(bcp(thread));
Deoptimization::update_method_data_from_interpreter(trap_mdo, trap_bci, reason);
}
}
}
static Handle get_preinitialized_exception(Klass* k, TRAPS) {
// get klass
InstanceKlass* klass = InstanceKlass::cast(k);
assert(klass->is_initialized(),
"this klass should have been initialized during VM initialization");
// create instance - do not call constructor since we may have no
// (java) stack space left (should assert constructor is empty)
Handle exception;
oop exception_oop = klass->allocate_instance(CHECK_(exception));
exception = Handle(THREAD, exception_oop);
if (StackTraceInThrowable) {
java_lang_Throwable::fill_in_stack_trace(exception);
}
return exception;
}
// Special handling for stack overflow: since we don't have any (java) stack
// space left we use the pre-allocated & pre-initialized StackOverflowError
// klass to create an stack overflow error instance. We do not call its
// constructor for the same reason (it is empty, anyway).
IRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* thread))
Handle exception = get_preinitialized_exception(
SystemDictionary::StackOverflowError_klass(),
CHECK);
THROW_HANDLE(exception);
IRT_END
IRT_ENTRY(void, InterpreterRuntime::create_exception(JavaThread* thread, char* name, char* message))
// lookup exception klass
TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
if (ProfileTraps) {
if (s == vmSymbols::java_lang_ArithmeticException()) {
note_trap(thread, Deoptimization::Reason_div0_check, CHECK);
} else if (s == vmSymbols::java_lang_NullPointerException()) {
note_trap(thread, Deoptimization::Reason_null_check, CHECK);
}
}
// create exception
Handle exception = Exceptions::new_exception(thread, s, message);
thread->set_vm_result(exception());
IRT_END
IRT_ENTRY(void, InterpreterRuntime::create_klass_exception(JavaThread* thread, char* name, oopDesc* obj))
ResourceMark rm(thread);
const char* klass_name = obj->klass()->external_name();
// lookup exception klass
TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
if (ProfileTraps) {
note_trap(thread, Deoptimization::Reason_class_check, CHECK);
}
// create exception, with klass name as detail message
Handle exception = Exceptions::new_exception(thread, s, klass_name);
thread->set_vm_result(exception());
IRT_END
IRT_ENTRY(void, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException(JavaThread* thread, char* name, jint index))
char message[jintAsStringSize];
// lookup exception klass
TempNewSymbol s = SymbolTable::new_symbol(name, CHECK);
if (ProfileTraps) {
note_trap(thread, Deoptimization::Reason_range_check, CHECK);
}
// create exception
sprintf(message, "%d", index);
THROW_MSG(s, message);
IRT_END
IRT_ENTRY(void, InterpreterRuntime::throw_ClassCastException(
JavaThread* thread, oopDesc* obj))
ResourceMark rm(thread);
char* message = SharedRuntime::generate_class_cast_message(
thread, obj->klass()->external_name());
if (ProfileTraps) {
note_trap(thread, Deoptimization::Reason_class_check, CHECK);
}
// create exception
THROW_MSG(vmSymbols::java_lang_ClassCastException(), message);
IRT_END
// exception_handler_for_exception(...) returns the continuation address,
// the exception oop (via TLS) and sets the bci/bcp for the continuation.
// The exception oop is returned to make sure it is preserved over GC (it
// is only on the stack if the exception was thrown explicitly via athrow).
// During this operation, the expression stack contains the values for the
// bci where the exception happened. If the exception was propagated back
// from a call, the expression stack contains the values for the bci at the
// invoke w/o arguments (i.e., as if one were inside the call).
IRT_ENTRY(address, InterpreterRuntime::exception_handler_for_exception(JavaThread* thread, oopDesc* exception))
Handle h_exception(thread, exception);
methodHandle h_method (thread, method(thread));
constantPoolHandle h_constants(thread, h_method->constants());
bool should_repeat;
int handler_bci;
int current_bci = bci(thread);
// Need to do this check first since when _do_not_unlock_if_synchronized
// is set, we don't want to trigger any classloading which may make calls
// into java, or surprisingly find a matching exception handler for bci 0
// since at this moment the method hasn't been "officially" entered yet.
if (thread->do_not_unlock_if_synchronized()) {
ResourceMark rm;
assert(current_bci == 0, "bci isn't zero for do_not_unlock_if_synchronized");
thread->set_vm_result(exception);
#ifdef CC_INTERP
return (address) -1;
#else
return Interpreter::remove_activation_entry();
#endif
}
do {
should_repeat = false;
// assertions
#ifdef ASSERT
assert(h_exception.not_null(), "NULL exceptions should be handled by athrow");
assert(h_exception->is_oop(), "just checking");
// Check that exception is a subclass of Throwable, otherwise we have a VerifyError
if (!(h_exception->is_a(SystemDictionary::Throwable_klass()))) {
if (ExitVMOnVerifyError) vm_exit(-1);
ShouldNotReachHere();
}
#endif
// tracing
if (TraceExceptions) {
ttyLocker ttyl;
ResourceMark rm(thread);
tty->print_cr("Exception <%s> (" INTPTR_FORMAT ")", h_exception->print_value_string(), (address)h_exception());
tty->print_cr(" thrown in interpreter method <%s>", h_method->print_value_string());
tty->print_cr(" at bci %d for thread " INTPTR_FORMAT, current_bci, thread);
}
// Don't go paging in something which won't be used.
// else if (extable->length() == 0) {
// // disabled for now - interpreter is not using shortcut yet
// // (shortcut is not to call runtime if we have no exception handlers)
// // warning("performance bug: should not call runtime if method has no exception handlers");
// }
// for AbortVMOnException flag
NOT_PRODUCT(Exceptions::debug_check_abort(h_exception));
// exception handler lookup
KlassHandle h_klass(THREAD, h_exception->klass());
handler_bci = Method::fast_exception_handler_bci_for(h_method, h_klass, current_bci, THREAD);
if (HAS_PENDING_EXCEPTION) {
// We threw an exception while trying to find the exception handler.
// Transfer the new exception to the exception handle which will
// be set into thread local storage, and do another lookup for an
// exception handler for this exception, this time starting at the
// BCI of the exception handler which caused the exception to be
// thrown (bug 4307310).
h_exception = Handle(THREAD, PENDING_EXCEPTION);
CLEAR_PENDING_EXCEPTION;
if (handler_bci >= 0) {
current_bci = handler_bci;
should_repeat = true;
}
}
} while (should_repeat == true);
// notify JVMTI of an exception throw; JVMTI will detect if this is a first
// time throw or a stack unwinding throw and accordingly notify the debugger
if (JvmtiExport::can_post_on_exceptions()) {
JvmtiExport::post_exception_throw(thread, h_method(), bcp(thread), h_exception());
}
#ifdef CC_INTERP
address continuation = (address)(intptr_t) handler_bci;
#else
address continuation = NULL;
#endif
address handler_pc = NULL;
if (handler_bci < 0 || !thread->reguard_stack((address) &continuation)) {
// Forward exception to callee (leaving bci/bcp untouched) because (a) no
// handler in this method, or (b) after a stack overflow there is not yet
// enough stack space available to reprotect the stack.
#ifndef CC_INTERP
continuation = Interpreter::remove_activation_entry();
#endif
// Count this for compilation purposes
h_method->interpreter_throwout_increment(THREAD);
} else {
// handler in this method => change bci/bcp to handler bci/bcp and continue there
handler_pc = h_method->code_base() + handler_bci;
#ifndef CC_INTERP
set_bcp_and_mdp(handler_pc, thread);
continuation = Interpreter::dispatch_table(vtos)[*handler_pc];
#endif
}
// notify debugger of an exception catch
// (this is good for exceptions caught in native methods as well)
if (JvmtiExport::can_post_on_exceptions()) {
JvmtiExport::notice_unwind_due_to_exception(thread, h_method(), handler_pc, h_exception(), (handler_pc != NULL));
}
thread->set_vm_result(h_exception());
return continuation;
IRT_END
IRT_ENTRY(void, InterpreterRuntime::throw_pending_exception(JavaThread* thread))
assert(thread->has_pending_exception(), "must only ne called if there's an exception pending");
// nothing to do - eventually we should remove this code entirely (see comments @ call sites)
IRT_END
IRT_ENTRY(void, InterpreterRuntime::throw_AbstractMethodError(JavaThread* thread))
THROW(vmSymbols::java_lang_AbstractMethodError());
IRT_END
IRT_ENTRY(void, InterpreterRuntime::throw_IncompatibleClassChangeError(JavaThread* thread))
THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
IRT_END
//------------------------------------------------------------------------------------------------------------------------
// Fields
//
IRT_ENTRY(void, InterpreterRuntime::resolve_get_put(JavaThread* thread, Bytecodes::Code bytecode))
// resolve field
fieldDescriptor info;
constantPoolHandle pool(thread, method(thread)->constants());
bool is_put = (bytecode == Bytecodes::_putfield || bytecode == Bytecodes::_putstatic);
bool is_static = (bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic);
{
JvmtiHideSingleStepping jhss(thread);
LinkResolver::resolve_field_access(info, pool, get_index_u2_cpcache(thread, bytecode),
bytecode, CHECK);
} // end JvmtiHideSingleStepping
// check if link resolution caused cpCache to be updated
if (already_resolved(thread)) return;
// compute auxiliary field attributes
TosState state = as_TosState(info.field_type());
// We need to delay resolving put instructions on final fields
// until we actually invoke one. This is required so we throw
// exceptions at the correct place. If we do not resolve completely
// in the current pass, leaving the put_code set to zero will
// cause the next put instruction to reresolve.
Bytecodes::Code put_code = (Bytecodes::Code)0;
// We also need to delay resolving getstatic instructions until the
// class is intitialized. This is required so that access to the static
// field will call the initialization function every time until the class
// is completely initialized ala. in 2.17.5 in JVM Specification.
InstanceKlass* klass = InstanceKlass::cast(info.field_holder());
bool uninitialized_static = ((bytecode == Bytecodes::_getstatic || bytecode == Bytecodes::_putstatic) &&
!klass->is_initialized());
Bytecodes::Code get_code = (Bytecodes::Code)0;
if (!uninitialized_static) {
get_code = ((is_static) ? Bytecodes::_getstatic : Bytecodes::_getfield);
if (is_put || !info.access_flags().is_final()) {
put_code = ((is_static) ? Bytecodes::_putstatic : Bytecodes::_putfield);
}
}
cache_entry(thread)->set_field(
get_code,
put_code,
info.field_holder(),
info.index(),
info.offset(),
state,
info.access_flags().is_final(),
info.access_flags().is_volatile(),
pool->pool_holder()
);
IRT_END
//------------------------------------------------------------------------------------------------------------------------
// Synchronization
//
// The interpreter's synchronization code is factored out so that it can
// be shared by method invocation and synchronized blocks.
//%note synchronization_3
//%note monitor_1
IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorenter(JavaThread* thread, BasicObjectLock* elem))
#ifdef ASSERT
thread->last_frame().interpreter_frame_verify_monitor(elem);
#endif
if (PrintBiasedLockingStatistics) {
Atomic::inc(BiasedLocking::slow_path_entry_count_addr());
}
Handle h_obj(thread, elem->obj());
assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
"must be NULL or an object");
if (UseBiasedLocking) {
// Retry fast entry if bias is revoked to avoid unnecessary inflation
ObjectSynchronizer::fast_enter(h_obj, elem->lock(), true, CHECK);
} else {
ObjectSynchronizer::slow_enter(h_obj, elem->lock(), CHECK);
}
assert(Universe::heap()->is_in_reserved_or_null(elem->obj()),
"must be NULL or an object");
#ifdef ASSERT
thread->last_frame().interpreter_frame_verify_monitor(elem);
#endif
IRT_END
//%note monitor_1
IRT_ENTRY_NO_ASYNC(void, InterpreterRuntime::monitorexit(JavaThread* thread, BasicObjectLock* elem))
#ifdef ASSERT
thread->last_frame().interpreter_frame_verify_monitor(elem);
#endif
Handle h_obj(thread, elem->obj());
assert(Universe::heap()->is_in_reserved_or_null(h_obj()),
"must be NULL or an object");
if (elem == NULL || h_obj()->is_unlocked()) {
THROW(vmSymbols::java_lang_IllegalMonitorStateException());
}
ObjectSynchronizer::slow_exit(h_obj(), elem->lock(), thread);
// Free entry. This must be done here, since a pending exception might be installed on
// exit. If it is not cleared, the exception handling code will try to unlock the monitor again.
elem->set_obj(NULL);
#ifdef ASSERT
thread->last_frame().interpreter_frame_verify_monitor(elem);
#endif
IRT_END
IRT_ENTRY(void, InterpreterRuntime::throw_illegal_monitor_state_exception(JavaThread* thread))
THROW(vmSymbols::java_lang_IllegalMonitorStateException());
IRT_END
IRT_ENTRY(void, InterpreterRuntime::new_illegal_monitor_state_exception(JavaThread* thread))
// Returns an illegal exception to install into the current thread. The
// pending_exception flag is cleared so normal exception handling does not
// trigger. Any current installed exception will be overwritten. This
// method will be called during an exception unwind.
assert(!HAS_PENDING_EXCEPTION, "no pending exception");
Handle exception(thread, thread->vm_result());
assert(exception() != NULL, "vm result should be set");
thread->set_vm_result(NULL); // clear vm result before continuing (may cause memory leaks and assert failures)
if (!exception->is_a(SystemDictionary::ThreadDeath_klass())) {
exception = get_preinitialized_exception(
SystemDictionary::IllegalMonitorStateException_klass(),
CATCH);
}
thread->set_vm_result(exception());
IRT_END
//------------------------------------------------------------------------------------------------------------------------
// Invokes
IRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* thread, Method* method, address bcp))
return method->orig_bytecode_at(method->bci_from(bcp));
IRT_END
IRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* thread, Method* method, address bcp, Bytecodes::Code new_code))
method->set_orig_bytecode_at(method->bci_from(bcp), new_code);
IRT_END
IRT_ENTRY(void, InterpreterRuntime::_breakpoint(JavaThread* thread, Method* method, address bcp))
JvmtiExport::post_raw_breakpoint(thread, method, bcp);
IRT_END
IRT_ENTRY(void, InterpreterRuntime::resolve_invoke(JavaThread* thread, Bytecodes::Code bytecode)) {
// extract receiver from the outgoing argument list if necessary
Handle receiver(thread, NULL);
if (bytecode == Bytecodes::_invokevirtual || bytecode == Bytecodes::_invokeinterface) {
ResourceMark rm(thread);
methodHandle m (thread, method(thread));
Bytecode_invoke call(m, bci(thread));
Symbol* signature = call.signature();
receiver = Handle(thread,
thread->last_frame().interpreter_callee_receiver(signature));
assert(Universe::heap()->is_in_reserved_or_null(receiver()),
"sanity check");
assert(receiver.is_null() ||
!Universe::heap()->is_in_reserved(receiver->klass()),
"sanity check");
}
// resolve method
CallInfo info;
constantPoolHandle pool(thread, method(thread)->constants());
{
JvmtiHideSingleStepping jhss(thread);
LinkResolver::resolve_invoke(info, receiver, pool,
get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
int retry_count = 0;
while (info.resolved_method()->is_old()) {
// It is very unlikely that method is redefined more than 100 times
// in the middle of resolve. If it is looping here more than 100 times
// means then there could be a bug here.
guarantee((retry_count++ < 100),
"Could not resolve to latest version of redefined method");
// method is redefined in the middle of resolve so re-try.
LinkResolver::resolve_invoke(info, receiver, pool,
get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
}
}
} // end JvmtiHideSingleStepping
// check if link resolution caused cpCache to be updated
if (already_resolved(thread)) return;
if (bytecode == Bytecodes::_invokeinterface) {
if (TraceItables && Verbose) {
ResourceMark rm(thread);
tty->print_cr("Resolving: klass: %s to method: %s", info.resolved_klass()->name()->as_C_string(), info.resolved_method()->name()->as_C_string());
}
}
#ifdef ASSERT
if (bytecode == Bytecodes::_invokeinterface) {
if (info.resolved_method()->method_holder() ==
SystemDictionary::Object_klass()) {
// NOTE: THIS IS A FIX FOR A CORNER CASE in the JVM spec
// (see also CallInfo::set_interface for details)
assert(info.call_kind() == CallInfo::vtable_call ||
info.call_kind() == CallInfo::direct_call, "");
methodHandle rm = info.resolved_method();
assert(rm->is_final() || info.has_vtable_index(),
"should have been set already");
} else if (!info.resolved_method()->has_itable_index()) {
// Resolved something like CharSequence.toString. Use vtable not itable.
assert(info.call_kind() != CallInfo::itable_call, "");
} else {
// Setup itable entry
assert(info.call_kind() == CallInfo::itable_call, "");
int index = info.resolved_method()->itable_index();
assert(info.itable_index() == index, "");
}
} else {
assert(info.call_kind() == CallInfo::direct_call ||
info.call_kind() == CallInfo::vtable_call, "");
}
#endif
switch (info.call_kind()) {
case CallInfo::direct_call:
cache_entry(thread)->set_direct_call(
bytecode,
info.resolved_method());
break;
case CallInfo::vtable_call:
cache_entry(thread)->set_vtable_call(
bytecode,
info.resolved_method(),
info.vtable_index());
break;
case CallInfo::itable_call:
cache_entry(thread)->set_itable_call(
bytecode,
info.resolved_method(),
info.itable_index());
break;
default: ShouldNotReachHere();
}
}
IRT_END
// First time execution: Resolve symbols, create a permanent MethodType object.
IRT_ENTRY(void, InterpreterRuntime::resolve_invokehandle(JavaThread* thread)) {
assert(EnableInvokeDynamic, "");
const Bytecodes::Code bytecode = Bytecodes::_invokehandle;
// resolve method
CallInfo info;
constantPoolHandle pool(thread, method(thread)->constants());
{
JvmtiHideSingleStepping jhss(thread);
LinkResolver::resolve_invoke(info, Handle(), pool,
get_index_u2_cpcache(thread, bytecode), bytecode, CHECK);
} // end JvmtiHideSingleStepping
cache_entry(thread)->set_method_handle(pool, info);
}
IRT_END
// First time execution: Resolve symbols, create a permanent CallSite object.
IRT_ENTRY(void, InterpreterRuntime::resolve_invokedynamic(JavaThread* thread)) {
assert(EnableInvokeDynamic, "");
const Bytecodes::Code bytecode = Bytecodes::_invokedynamic;
//TO DO: consider passing BCI to Java.
// int caller_bci = method(thread)->bci_from(bcp(thread));
// resolve method
CallInfo info;
constantPoolHandle pool(thread, method(thread)->constants());
int index = get_index_u4(thread, bytecode);
{
JvmtiHideSingleStepping jhss(thread);
LinkResolver::resolve_invoke(info, Handle(), pool,
index, bytecode, CHECK);
} // end JvmtiHideSingleStepping
ConstantPoolCacheEntry* cp_cache_entry = pool->invokedynamic_cp_cache_entry_at(index);
cp_cache_entry->set_dynamic_call(pool, info);
}
IRT_END
//------------------------------------------------------------------------------------------------------------------------
// Miscellaneous
nmethod* InterpreterRuntime::frequency_counter_overflow(JavaThread* thread, address branch_bcp) {
nmethod* nm = frequency_counter_overflow_inner(thread, branch_bcp);
assert(branch_bcp != NULL || nm == NULL, "always returns null for non OSR requests");
if (branch_bcp != NULL && nm != NULL) {
// This was a successful request for an OSR nmethod. Because
// frequency_counter_overflow_inner ends with a safepoint check,
// nm could have been unloaded so look it up again. It's unsafe
// to examine nm directly since it might have been freed and used
// for something else.
frame fr = thread->last_frame();
Method* method = fr.interpreter_frame_method();
int bci = method->bci_from(fr.interpreter_frame_bcp());
nm = method->lookup_osr_nmethod_for(bci, CompLevel_none, false);
}
#ifndef PRODUCT
if (TraceOnStackReplacement) {
if (nm != NULL) {
tty->print("OSR entry @ pc: " INTPTR_FORMAT ": ", nm->osr_entry());
nm->print();
}
}
#endif
return nm;
}
IRT_ENTRY(nmethod*,
InterpreterRuntime::frequency_counter_overflow_inner(JavaThread* thread, address branch_bcp))
// use UnlockFlagSaver to clear and restore the _do_not_unlock_if_synchronized
// flag, in case this method triggers classloading which will call into Java.
UnlockFlagSaver fs(thread);
frame fr = thread->last_frame();
assert(fr.is_interpreted_frame(), "must come from interpreter");
methodHandle method(thread, fr.interpreter_frame_method());
const int branch_bci = branch_bcp != NULL ? method->bci_from(branch_bcp) : InvocationEntryBci;
const int bci = branch_bcp != NULL ? method->bci_from(fr.interpreter_frame_bcp()) : InvocationEntryBci;
assert(!HAS_PENDING_EXCEPTION, "Should not have any exceptions pending");
nmethod* osr_nm = CompilationPolicy::policy()->event(method, method, branch_bci, bci, CompLevel_none, NULL, thread);
assert(!HAS_PENDING_EXCEPTION, "Event handler should not throw any exceptions");
if (osr_nm != NULL) {
// We may need to do on-stack replacement which requires that no
// monitors in the activation are biased because their
// BasicObjectLocks will need to migrate during OSR. Force
// unbiasing of all monitors in the activation now (even though
// the OSR nmethod might be invalidated) because we don't have a
// safepoint opportunity later once the migration begins.
if (UseBiasedLocking) {
ResourceMark rm;
GrowableArray<Handle>* objects_to_revoke = new GrowableArray
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