void CompiledDirectStaticCall::set_to_interpreted(const methodHandle& callee, address entry) {
address stub = find_stub(/*is_aot*/ false);
guarantee(stub != NULL, "stub not found");
if (TraceICs) {
ResourceMark rm;
tty->print_cr("CompiledDirectStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s",
p2i(instruction_address()),
callee->name_and_sig_as_C_string());
}
// Creation also verifies the object.
NativeMovConstReg* method_holder = nativeMovConstReg_at(stub + NativeCall::get_IC_pos_in_java_to_interp_stub());
NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
// A generated lambda form might be deleted from the Lambdaform
// cache in MethodTypeForm. If a jit compiled lambdaform method
// becomes not entrant and the cache access returns null, the new
// resolve will lead to a new generated LambdaForm.
assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee() || callee->is_compiled_lambda_form(),
"a) MT-unsafe modification of inline cache");
assert(jump->jump_destination() == (address)-1 || jump->jump_destination() == entry,
"b) MT-unsafe modification of inline cache");
// Update stub.
method_holder->set_data((intptr_t)callee());
jump->set_jump_destination(entry);
// Update jump to call.
set_destination_mt_safe(stub);
}
void CompiledStaticCall::set_to_interpreted(methodHandle callee, address entry) {
address stub = find_stub();
guarantee(stub != NULL, "stub not found");
if (TraceICs) {
ResourceMark rm;
tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_interpreted %s",
p2i(instruction_address()),
callee->name_and_sig_as_C_string());
}
// Creation also verifies the object.
NativeMovConstReg* method_holder = nativeMovConstReg_at(stub);
NativeJump* jump = nativeJump_at(method_holder->next_instruction_address());
assert(method_holder->data() == 0 || method_holder->data() == (intptr_t)callee(),
"a) MT-unsafe modification of inline cache");
assert(jump->jump_destination() == (address)-1 || jump->jump_destination() == entry,
"b) MT-unsafe modification of inline cache");
// Update stub.
method_holder->set_data((intptr_t)callee());
jump->set_jump_destination(entry);
// Update jump to call.
set_destination_mt_safe(stub);
}
void CompiledStaticCall::set_to_clean() {
assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
// Reset call site
MutexLockerEx pl(SafepointSynchronize::is_at_safepoint() ? NULL : Patching_lock, Mutex::_no_safepoint_check_flag);
#ifdef ASSERT
CodeBlob* cb = CodeCache::find_blob_unsafe(this);
assert(cb != NULL && cb->is_nmethod(), "must be nmethod");
#endif
set_destination_mt_safe(SharedRuntime::get_resolve_static_call_stub());
// Do not reset stub here: It is too expensive to call find_stub.
// Instead, rely on caller (nmethod::clear_inline_caches) to clear
// both the call and its stub.
}
void CompiledStaticCall::set(const StaticCallInfo& info) {
assert (CompiledIC_lock->is_locked() || SafepointSynchronize::is_at_safepoint(), "mt unsafe call");
MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
// 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
assert(is_clean(), "do not update a call entry - use clean");
if (info._to_interpreter) {
// Call to interpreted code
set_to_interpreted(info.callee(), info.entry());
} else {
if (TraceICs) {
ResourceMark rm;
tty->print_cr("CompiledStaticCall@" INTPTR_FORMAT ": set_to_compiled " INTPTR_FORMAT,
p2i(instruction_address()),
p2i(info.entry()));
}
// Call to compiled code
assert (CodeCache::contains(info.entry()), "wrong entry point");
set_destination_mt_safe(info.entry());
}
}
