bool CompiledIC::is_call_to_interpreted() const {
assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
// Call to interpreter if destination is either calling to a stub (if it
// is optimized), or calling to an I2C
bool is_call_to_interpreted = false;
#ifdef COMPILER1
if (!is_optimized()) {
is_call_to_interpreted =
Runtime1::blob_for(Runtime1::interpreter_entries_id)->contains(ic_destination());
} else {
// Check if we are calling into our own codeblob (i.e., to a stub)
CodeBlob* cb = CodeCache::find_blob(_ic_call->instruction_address());
is_call_to_interpreted = cb->contains(ic_destination());
}
#else
if (!is_optimized()) {
CodeBlob* cb = CodeCache::find_blob(ic_destination());
is_call_to_interpreted = (cb != NULL && cb->is_c2i_adapter());
} else {
// Check if we are calling into our own codeblob (i.e., to a stub)
CodeBlob* cb = CodeCache::find_blob(_ic_call->instruction_address());
is_call_to_interpreted = cb->contains(ic_destination());
}
#endif // COMPILER1
assert(!is_call_to_interpreted || is_optimized() || (cached_oop() != NULL && cached_oop()->is_compiledICHolder()), "sanity check");
return is_call_to_interpreted;
}
void CompiledIC::internal_set_ic_destination(address entry_point, bool is_icstub, void* cache, bool is_icholder) {
assert(entry_point != NULL, "must set legal entry point");
assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
assert (!is_optimized() || cache == NULL, "an optimized virtual call does not have a cached metadata");
assert (cache == NULL || cache != (Metadata*)badOopVal, "invalid metadata");
assert(!is_icholder || is_icholder_entry(entry_point), "must be");
// Don't use ic_destination for this test since that forwards
// through ICBuffer instead of returning the actual current state of
// the CompiledIC.
if (is_icholder_entry(_ic_call->destination())) {
// When patching for the ICStub case the cached value isn't
// overwritten until the ICStub copied into the CompiledIC during
// the next safepoint. Make sure that the CompiledICHolder* is
// marked for release at this point since it won't be identifiable
// once the entry point is overwritten.
InlineCacheBuffer::queue_for_release((CompiledICHolder*)_value->data());
}
if (TraceCompiledIC) {
tty->print(" ");
print_compiled_ic();
tty->print(" changing destination to " INTPTR_FORMAT, p2i(entry_point));
if (!is_optimized()) {
tty->print(" changing cached %s to " INTPTR_FORMAT, is_icholder ? "icholder" : "metadata", p2i((address)cache));
}
if (is_icstub) {
tty->print(" (icstub)");
}
tty->cr();
}
{
MutexLockerEx pl(SafepointSynchronize::is_at_safepoint() ? NULL : Patching_lock, Mutex::_no_safepoint_check_flag);
#ifdef ASSERT
CodeBlob* cb = CodeCache::find_blob_unsafe(_ic_call);
assert(cb != NULL && cb->is_nmethod(), "must be nmethod");
#endif
_ic_call->set_destination_mt_safe(entry_point);
}
if (is_optimized() || is_icstub) {
// Optimized call sites don't have a cache value and ICStub call
// sites only change the entry point. Changing the value in that
// case could lead to MT safety issues.
assert(cache == NULL, "must be null");
return;
}
if (cache == NULL) cache = (void*)Universe::non_oop_word();
_value->set_data((intptr_t)cache);
}
void CompiledIC::set_cached_oop(oop cache) {
assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
assert (!is_optimized(), "an optimized virtual call does not have a cached oop");
assert (cache == NULL || cache != badOop, "invalid oop");
if (TraceCompiledIC) {
tty->print(" ");
print_compiled_ic();
tty->print_cr(" changing oop to " INTPTR_FORMAT, cache);
}
if (cache == NULL) cache = (oop)Universe::non_oop_word();
*_oop_addr = cache;
// fix up the relocations
RelocIterator iter = _oops;
while (iter.next()) {
if (iter.type() == relocInfo::oop_type) {
oop_Relocation* r = iter.oop_reloc();
if (r->oop_addr() == _oop_addr)
r->fix_oop_relocation();
}
}
return;
}
// true if destination is megamorphic stub
bool CompiledIC::is_megamorphic() const {
assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
assert(!is_optimized(), "an optimized call cannot be megamorphic");
// Cannot rely on cached_oop. It is either an interface or a method.
return VtableStubs::is_entry_point(ic_destination());
}
bool CompiledIC::is_call_to_interpreted() const {
assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
// Call to interpreter if destination is either calling to a stub (if it
// is optimized), or calling to an I2C blob
bool is_call_to_interpreted = false;
if (!is_optimized()) {
// must use unsafe because the destination can be a zombie (and we're cleaning)
// and the print_compiled_ic code wants to know if site (in the non-zombie)
// is to the interpreter.
CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination());
is_call_to_interpreted = (cb != NULL && cb->is_adapter_blob());
assert(!is_call_to_interpreted || (is_icholder_call() && cached_icholder() != NULL), "sanity check");
} else {
// Check if we are calling into our own codeblob (i.e., to a stub)
CodeBlob* cb = CodeCache::find_blob(_ic_call->instruction_address());
address dest = ic_destination();
#ifdef ASSERT
{
CodeBlob* db = CodeCache::find_blob_unsafe(dest);
assert(!db->is_adapter_blob(), "must use stub!");
}
#endif /* ASSERT */
is_call_to_interpreted = cb->contains(dest);
}
return is_call_to_interpreted;
}
bool CompiledIC::is_call_to_compiled() const {
assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
// Use unsafe, since an inline cache might point to a zombie method. However, the zombie
// method is guaranteed to still exist, since we only remove methods after all inline caches
// has been cleaned up
CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination());
bool is_monomorphic = (cb != NULL && cb->is_nmethod());
// Check that the cached_oop is a klass for non-optimized monomorphic calls
// This assertion is invalid for compiler1: a call that does not look optimized (no static stub) can be used
// for calling directly to vep without using the inline cache (i.e., cached_oop == NULL)
#ifdef ASSERT
#ifdef TIERED
CodeBlob* caller = CodeCache::find_blob_unsafe(instruction_address());
bool is_c1_method = caller->is_compiled_by_c1();
#else
#ifdef COMPILER1
bool is_c1_method = true;
#else
bool is_c1_method = false;
#endif // COMPILER1
#endif // TIERED
assert( is_c1_method ||
!is_monomorphic ||
is_optimized() ||
(cached_oop() != NULL && cached_oop()->is_klass()), "sanity check");
#endif // ASSERT
return is_monomorphic;
}
void CompiledIC::verify() {
// make sure code pattern is actually a call imm32 instruction
_ic_call->verify();
if (os::is_MP()) {
_ic_call->verify_alignment();
}
assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted()
|| is_optimized() || is_megamorphic(), "sanity check");
}
bool CompiledIC::is_clean() const {
assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
bool is_clean = false;
address dest = ic_destination();
is_clean = dest == SharedRuntime::get_resolve_opt_virtual_call_stub() ||
dest == SharedRuntime::get_resolve_virtual_call_stub();
assert(!is_clean || is_optimized() || cached_value() == NULL, "sanity check");
return is_clean;
}
void CompiledIC::set_to_clean() {
assert(SafepointSynchronize::is_at_safepoint() || CompiledIC_lock->is_locked() , "MT-unsafe call");
if (TraceInlineCacheClearing || TraceICs) {
tty->print_cr("IC@" INTPTR_FORMAT ": set to clean", instruction_address());
print();
}
address entry;
#ifdef COMPILER1
entry = is_optimized() ?
Runtime1::entry_for(Runtime1::resolve_invoke_opt_virtual_id) :
Runtime1::entry_for(Runtime1::resolve_invokevirtual_id);
#else
entry =
is_optimized()
? OptoRuntime::resolve_opt_virtual_call_Java()
: OptoRuntime::resolve_virtual_call_Java();
#endif
// A zombie transition will always be safe, since the oop has already been set to NULL, so
// we only need to patch the destination
bool safe_transition = is_optimized() || SafepointSynchronize::is_at_safepoint();
if (safe_transition) {
if (!is_optimized()) set_cached_oop(NULL);
// Kill any leftover stub we might have too
if (is_in_transition_state()) {
ICStub* old_stub = ICStub_from_destination_address(stub_address());
old_stub->clear();
}
set_ic_destination(entry);
} else {
// Unsafe transition - create stub.
InlineCacheBuffer::create_transition_stub(this, NULL, entry);
}
// We can't check this anymore. With lazy deopt we could have already
// cleaned this IC entry before we even return. This is possible if
// we ran out of space in the inline cache buffer trying to do the
// set_next and we safepointed to free up space. This is a benign
// race because the IC entry was complete when we safepointed so
// cleaning it immediately is harmless.
// assert(is_clean(), "sanity check");
}
void CompiledIC::set_to_clean(bool in_use) {
assert(SafepointSynchronize::is_at_safepoint() || CompiledIC_lock->is_locked() , "MT-unsafe call");
if (TraceInlineCacheClearing || TraceICs) {
tty->print_cr("IC@" INTPTR_FORMAT ": set to clean", p2i(instruction_address()));
print();
}
address entry;
if (is_optimized()) {
entry = SharedRuntime::get_resolve_opt_virtual_call_stub();
} else {
entry = SharedRuntime::get_resolve_virtual_call_stub();
}
// A zombie transition will always be safe, since the metadata has already been set to NULL, so
// we only need to patch the destination
bool safe_transition = !in_use || is_optimized() || SafepointSynchronize::is_at_safepoint();
if (safe_transition) {
// Kill any leftover stub we might have too
clear_ic_stub();
if (is_optimized()) {
set_ic_destination(entry);
} else {
set_ic_destination_and_value(entry, (void*)NULL);
}
} else {
// Unsafe transition - create stub.
InlineCacheBuffer::create_transition_stub(this, NULL, entry);
}
// We can't check this anymore. With lazy deopt we could have already
// cleaned this IC entry before we even return. This is possible if
// we ran out of space in the inline cache buffer trying to do the
// set_next and we safepointed to free up space. This is a benign
// race because the IC entry was complete when we safepointed so
// cleaning it immediately is harmless.
// assert(is_clean(), "sanity check");
}
bool CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS) {
assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
assert(!is_optimized(), "cannot set an optimized virtual call to megamorphic");
assert(is_call_to_compiled() || is_call_to_interpreted(), "going directly to megamorphic?");
address entry;
if (call_info->call_kind() == CallInfo::itable_call) {
assert(bytecode == Bytecodes::_invokeinterface, "");
int itable_index = call_info->itable_index();
entry = VtableStubs::find_itable_stub(itable_index);
if (entry == false) {
return false;
}
#ifdef ASSERT
int index = call_info->resolved_method()->itable_index();
assert(index == itable_index, "CallInfo pre-computes this");
InstanceKlass* k = call_info->resolved_method()->method_holder();
assert(k->verify_itable_index(itable_index), "sanity check");
#endif //ASSERT
CompiledICHolder* holder = new CompiledICHolder(call_info->resolved_method()->method_holder(),
call_info->resolved_klass()(), false);
holder->claim();
InlineCacheBuffer::create_transition_stub(this, holder, entry);
} else {
assert(call_info->call_kind() == CallInfo::vtable_call, "either itable or vtable");
// Can be different than selected_method->vtable_index(), due to package-private etc.
int vtable_index = call_info->vtable_index();
assert(call_info->resolved_klass()->verify_vtable_index(vtable_index), "sanity check");
entry = VtableStubs::find_vtable_stub(vtable_index);
if (entry == NULL) {
return false;
}
InlineCacheBuffer::create_transition_stub(this, NULL, entry);
}
if (TraceICs) {
ResourceMark rm;
tty->print_cr ("IC@" INTPTR_FORMAT ": to megamorphic %s entry: " INTPTR_FORMAT,
p2i(instruction_address()), call_info->selected_method()->print_value_string(), p2i(entry));
}
// We can't check this anymore. With lazy deopt we could have already
// cleaned this IC entry before we even return. This is possible if
// we ran out of space in the inline cache buffer trying to do the
// set_next and we safepointed to free up space. This is a benign
// race because the IC entry was complete when we safepointed so
// cleaning it immediately is harmless.
// assert(is_megamorphic(), "sanity check");
return true;
}
oop CompiledIC::cached_oop() const {
assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
assert (!is_optimized(), "an optimized virtual call does not have a cached oop");
if (!is_in_transition_state()) {
oop data = *_oop_addr;
// If we let the oop value here be initialized to zero...
assert(data != NULL || Universe::non_oop_word() == NULL,
"no raw nulls in CompiledIC oops, because of patching races");
return (data == (oop)Universe::non_oop_word()) ? NULL : data;
} else {
return InlineCacheBuffer::cached_oop_for((CompiledIC *)this);
}
}
bool CompiledIC::is_clean() const {
assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
bool is_clean = false;
address dest = ic_destination();
#ifdef COMPILER1
is_clean =
dest == Runtime1::entry_for(Runtime1::resolve_invokevirtual_id) ||
dest == Runtime1::entry_for(Runtime1::resolve_invoke_opt_virtual_id);
#else
is_clean = dest == OptoRuntime::resolve_virtual_call_Java() ||
dest == OptoRuntime::resolve_opt_virtual_call_Java();
#endif
assert(!is_clean || is_optimized() || cached_oop() == NULL, "sanity check");
return is_clean;
}
void CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS) {
methodHandle method = call_info->selected_method();
bool is_invoke_interface = (bytecode == Bytecodes::_invokeinterface && !call_info->has_vtable_index());
assert(CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
assert(method->is_oop(), "cannot be NULL and must be oop");
assert(!is_optimized(), "cannot set an optimized virtual call to megamorphic");
assert(is_call_to_compiled() || is_call_to_interpreted(), "going directly to megamorphic?");
address entry;
if (is_invoke_interface) {
int index = klassItable::compute_itable_index(call_info->resolved_method()());
entry = VtableStubs::create_stub(false, index, method());
assert(entry != NULL, "entry not computed");
klassOop k = call_info->resolved_method()->method_holder();
assert(Klass::cast(k)->is_interface(), "sanity check");
InlineCacheBuffer::create_transition_stub(this, k, entry);
} else {
// Can be different than method->vtable_index(), due to package-private etc.
int vtable_index = call_info->vtable_index();
entry = VtableStubs::create_stub(true, vtable_index, method());
InlineCacheBuffer::create_transition_stub(this, method(), entry);
}
if (TraceICs) {
ResourceMark rm;
tty->print_cr ("IC@" INTPTR_FORMAT ": to megamorphic %s entry: " INTPTR_FORMAT,
instruction_address(), method->print_value_string(), entry);
}
Events::log("compiledIC " INTPTR_FORMAT " --> megamorphic " INTPTR_FORMAT, this, method());
// We can't check this anymore. With lazy deopt we could have already
// cleaned this IC entry before we even return. This is possible if
// we ran out of space in the inline cache buffer trying to do the
// set_next and we safepointed to free up space. This is a benign
// race because the IC entry was complete when we safepointed so
// cleaning it immediately is harmless.
// assert(is_megamorphic(), "sanity check");
}
bool CompiledIC::is_call_to_compiled() const {
assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
// Use unsafe, since an inline cache might point to a zombie method. However, the zombie
// method is guaranteed to still exist, since we only remove methods after all inline caches
// has been cleaned up
CodeBlob* cb = CodeCache::find_blob_unsafe(ic_destination());
bool is_monomorphic = (cb != NULL && cb->is_nmethod());
// Check that the cached_value is a klass for non-optimized monomorphic calls
// This assertion is invalid for compiler1: a call that does not look optimized (no static stub) can be used
// for calling directly to vep without using the inline cache (i.e., cached_value == NULL).
// For JVMCI this occurs because CHA is only used to improve inlining so call sites which could be optimized
// virtuals because there are no currently loaded subclasses of a type are left as virtual call sites.
#ifdef ASSERT
CodeBlob* caller = CodeCache::find_blob_unsafe(instruction_address());
bool is_c1_or_jvmci_method = caller->is_compiled_by_c1() || caller->is_compiled_by_jvmci();
assert( is_c1_or_jvmci_method ||
!is_monomorphic ||
is_optimized() ||
!caller->is_alive() ||
(cached_metadata() != NULL && cached_metadata()->is_klass()), "sanity check");
#endif // ASSERT
return is_monomorphic;
}
void CompiledIC::print_compiled_ic() {
tty->print("Inline cache at " INTPTR_FORMAT ", calling %s " INTPTR_FORMAT " cached_value " INTPTR_FORMAT,
p2i(instruction_address()), is_call_to_interpreted() ? "interpreted " : "", p2i(ic_destination()), p2i(is_optimized() ? NULL : cached_value()));
}
void CompiledIC::set_to_monomorphic(CompiledICInfo& info) {
assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "");
// Updating a cache to the wrong entry can cause bugs that are very hard
// to track down - if cache entry gets invalid - we just clean it. In
// this way it is always the same code path that is responsible for
// updating and resolving an inline cache
//
// The above is no longer true. SharedRuntime::fixup_callers_callsite will change optimized
// callsites. In addition ic_miss code will update a site to monomorphic if it determines
// that an monomorphic call to the interpreter can now be monomorphic to compiled code.
//
// In both of these cases the only thing being modifed is the jump/call target and these
// transitions are mt_safe
Thread *thread = Thread::current();
if (info.to_interpreter()) {
// Call to interpreter
if (info.is_optimized() && is_optimized()) {
assert(is_clean(), "unsafe IC path");
MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
// the call analysis (callee structure) specifies that the call is optimized
// (either because of CHA or the static target is final)
// At code generation time, this call has been emitted as static call
// Call via stub
assert(info.cached_metadata() != NULL && info.cached_metadata()->is_method(), "sanity check");
CompiledStaticCall* csc = compiledStaticCall_at(instruction_address());
methodHandle method (thread, (Method*)info.cached_metadata());
csc->set_to_interpreted(method, info.entry());
if (TraceICs) {
ResourceMark rm(thread);
tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter: %s",
p2i(instruction_address()),
method->print_value_string());
}
} else {
// Call via method-klass-holder
InlineCacheBuffer::create_transition_stub(this, info.claim_cached_icholder(), info.entry());
if (TraceICs) {
ResourceMark rm(thread);
tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to interpreter via icholder ", p2i(instruction_address()));
}
}
} else {
// Call to compiled code
bool static_bound = info.is_optimized() || (info.cached_metadata() == NULL);
#ifdef ASSERT
CodeBlob* cb = CodeCache::find_blob_unsafe(info.entry());
assert (cb->is_nmethod(), "must be compiled!");
#endif /* ASSERT */
// This is MT safe if we come from a clean-cache and go through a
// non-verified entry point
bool safe = SafepointSynchronize::is_at_safepoint() ||
(!is_in_transition_state() && (info.is_optimized() || static_bound || is_clean()));
if (!safe) {
InlineCacheBuffer::create_transition_stub(this, info.cached_metadata(), info.entry());
} else {
if (is_optimized()) {
set_ic_destination(info.entry());
} else {
set_ic_destination_and_value(info.entry(), info.cached_metadata());
}
}
if (TraceICs) {
ResourceMark rm(thread);
assert(info.cached_metadata() == NULL || info.cached_metadata()->is_klass(), "must be");
tty->print_cr ("IC@" INTPTR_FORMAT ": monomorphic to compiled (rcvr klass) %s: %s",
p2i(instruction_address()),
((Klass*)info.cached_metadata())->print_value_string(),
(safe) ? "" : "via stub");
}
}
// We can't check this anymore. With lazy deopt we could have already
// cleaned this IC entry before we even return. This is possible if
// we ran out of space in the inline cache buffer trying to do the
// set_next and we safepointed to free up space. This is a benign
// race because the IC entry was complete when we safepointed so
// cleaning it immediately is harmless.
// assert(is_call_to_compiled() || is_call_to_interpreted(), "sanity check");
}