Method* ConstantPoolCacheEntry::method_if_resolved(constantPoolHandle cpool) {
// Decode the action of set_method and set_interface_call
Bytecodes::Code invoke_code = bytecode_1();
if (invoke_code != (Bytecodes::Code)0) {
Metadata* f1 = f1_ord();
if (f1 != NULL) {
switch (invoke_code) {
case Bytecodes::_invokeinterface:
assert(f1->is_klass(), "");
return klassItable::method_for_itable_index((Klass*)f1, f2_as_index());
case Bytecodes::_invokestatic:
case Bytecodes::_invokespecial:
assert(!has_appendix(), "");
case Bytecodes::_invokehandle:
case Bytecodes::_invokedynamic:
assert(f1->is_method(), "");
return (Method*)f1;
}
}
}
invoke_code = bytecode_2();
if (invoke_code != (Bytecodes::Code)0) {
switch (invoke_code) {
case Bytecodes::_invokevirtual:
if (is_vfinal()) {
// invokevirtual
Method* m = f2_as_vfinal_method();
assert(m->is_method(), "");
return m;
} else {
int holder_index = cpool->uncached_klass_ref_index_at(constant_pool_index());
if (cpool->tag_at(holder_index).is_klass()) {
Klass* klass = cpool->resolved_klass_at(holder_index);
if (!klass->oop_is_instance())
klass = SystemDictionary::Object_klass();
return InstanceKlass::cast(klass)->method_at_vtable(f2_as_index());
}
}
break;
}
}
return NULL;
}
inline void vframeStreamCommon::fill_from_compiled_frame(int decode_offset) {
_mode = compiled_mode;
// Range check to detect ridiculous offsets.
if (decode_offset == DebugInformationRecorder::serialized_null ||
decode_offset < 0 ||
decode_offset >= nm()->scopes_data_size()) {
// 6379830 AsyncGetCallTrace sometimes feeds us wild frames.
// If we attempt to read nmethod::scopes_data at serialized_null (== 0),
// or if we read some at other crazy offset,
// we will decode garbage and make wild references into the heap,
// leading to crashes in product mode.
// (This isn't airtight, of course, since there are internal
// offsets which are also crazy.)
#ifdef ASSERT
if (WizardMode) {
tty->print_cr("Error in fill_from_frame: pc_desc for "
INTPTR_FORMAT " not found or invalid at %d",
p2i(_frame.pc()), decode_offset);
nm()->print();
nm()->method()->print_codes();
nm()->print_code();
nm()->print_pcs();
}
#endif
// Provide a cheap fallback in product mode. (See comment above.)
found_bad_method_frame();
fill_from_compiled_native_frame();
return;
}
// Decode first part of scopeDesc
DebugInfoReadStream buffer(nm(), decode_offset);
_sender_decode_offset = buffer.read_int();
_method = buffer.read_method();
_bci = buffer.read_bci();
assert(_method->is_method(), "checking type of decoded method");
}
inline void vframeStreamCommon::fill_from_compiled_frame(int decode_offset) {
_mode = compiled_mode;
// Range check to detect ridiculous offsets.
if (decode_offset == DebugInformationRecorder::serialized_null ||
decode_offset < 0 ||
decode_offset >= nm()->scopes_data_size()) {
// 6379830 AsyncGetCallTrace sometimes feeds us wild frames.
// If we read nmethod::scopes_data at serialized_null (== 0)
// or if read some at other invalid offset, invalid values will be decoded.
// Based on these values, invalid heap locations could be referenced
// that could lead to crashes in product mode.
// Therefore, do not use the decode offset if invalid, but fill the frame
// as it were a native compiled frame (no Java-level assumptions).
#ifdef ASSERT
if (WizardMode) {
tty->print_cr("Error in fill_from_frame: pc_desc for "
INTPTR_FORMAT " not found or invalid at %d",
p2i(_frame.pc()), decode_offset);
nm()->print();
nm()->method()->print_codes();
nm()->print_code();
nm()->print_pcs();
}
#endif
// Provide a cheap fallback in product mode. (See comment above.)
found_bad_method_frame();
fill_from_compiled_native_frame();
return;
}
// Decode first part of scopeDesc
DebugInfoReadStream buffer(nm(), decode_offset);
_sender_decode_offset = buffer.read_int();
_method = buffer.read_method();
_bci = buffer.read_bci();
assert(_method->is_method(), "checking type of decoded method");
}
