inline void vframeStreamCommon::fill_from_interpreter_frame() {
methodOop method = _frame.interpreter_frame_method();
intptr_t bcx = _frame.interpreter_frame_bcx();
int bci = method->validate_bci_from_bcx(bcx);
// 6379830 AsyncGetCallTrace sometimes feeds us wild frames.
if (bci < 0) {
found_bad_method_frame();
bci = 0; // pretend it's on the point of entering
}
_mode = interpreted_mode;
_method = method;
_bci = bci;
}
inline void vframeStreamCommon::fill_from_interpreter_frame() {
Method* method = _frame.interpreter_frame_method();
address bcp = _frame.interpreter_frame_bcp();
int bci = method->validate_bci_from_bcp(bcp);
// 6379830 AsyncGetCallTrace sometimes feeds us wild frames.
// AsyncGetCallTrace interrupts the VM asynchronously. As a result
// it is possible to access an interpreter frame for which
// no Java-level information is yet available (e.g., becasue
// the frame was being created when the VM interrupted it).
// In this scenario, pretend that the interpreter is at the point
// of entering the method.
if (bci < 0) {
found_bad_method_frame();
bci = 0;
}
_mode = interpreted_mode;
_method = method;
_bci = bci;
}
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",
_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 = methodOop(buffer.read_oop());
_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");
}
