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8213486: SIGSEGV in CompiledMethod::cleanup_inline_caches_impl with AOT

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Reviewed-by: kvn, dlong
This commit is contained in:
Erik Österlund 2018-11-22 09:46:24 +01:00
parent 62b2f0f5c9
commit 44b1ed07f5
5 changed files with 79 additions and 76 deletions
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71
src/hotspot/share/code/nmethod.cpp
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@ -565,6 +565,7 @@ nmethod::nmethod(
ByteSize basic_lock_sp_offset,
OopMapSet* oop_maps )
: CompiledMethod(method, "native nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
_is_unloading_state(0),
_native_receiver_sp_offset(basic_lock_owner_sp_offset),
_native_basic_lock_sp_offset(basic_lock_sp_offset)
{
@ -609,6 +610,7 @@ nmethod::nmethod(
code_buffer->copy_code_and_locs_to(this);
code_buffer->copy_values_to(this);
clear_unloading_state();
if (ScavengeRootsInCode) {
Universe::heap()->register_nmethod(this);
}
@ -672,6 +674,7 @@ nmethod::nmethod(
#endif
)
: CompiledMethod(method, "nmethod", type, nmethod_size, sizeof(nmethod), code_buffer, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps, false),
_is_unloading_state(0),
_native_receiver_sp_offset(in_ByteSize(-1)),
_native_basic_lock_sp_offset(in_ByteSize(-1))
{
@ -1505,6 +1508,74 @@ void nmethod::metadata_do(void f(Metadata*)) {
if (_method != NULL) f(_method);
}
// The _is_unloading_state encodes a tuple comprising the unloading cycle
// and the result of IsUnloadingBehaviour::is_unloading() fpr that cycle.
// This is the bit layout of the _is_unloading_state byte: 00000CCU
// CC refers to the cycle, which has 2 bits, and U refers to the result of
// IsUnloadingBehaviour::is_unloading() for that unloading cycle.
class IsUnloadingState: public AllStatic {
static const uint8_t _is_unloading_mask = 1;
static const uint8_t _is_unloading_shift = 0;
static const uint8_t _unloading_cycle_mask = 6;
static const uint8_t _unloading_cycle_shift = 1;
static uint8_t set_is_unloading(uint8_t state, bool value) {
state &= ~_is_unloading_mask;
if (value) {
state |= 1 << _is_unloading_shift;
}
assert(is_unloading(state) == value, "unexpected unloading cycle overflow");
return state;
}
static uint8_t set_unloading_cycle(uint8_t state, uint8_t value) {
state &= ~_unloading_cycle_mask;
state |= value << _unloading_cycle_shift;
assert(unloading_cycle(state) == value, "unexpected unloading cycle overflow");
return state;
}
public:
static bool is_unloading(uint8_t state) { return (state & _is_unloading_mask) >> _is_unloading_shift == 1; }
static uint8_t unloading_cycle(uint8_t state) { return (state & _unloading_cycle_mask) >> _unloading_cycle_shift; }
static uint8_t create(bool is_unloading, uint8_t unloading_cycle) {
uint8_t state = 0;
state = set_is_unloading(state, is_unloading);
state = set_unloading_cycle(state, unloading_cycle);
return state;
}
};
bool nmethod::is_unloading() {
uint8_t state = RawAccess<MO_RELAXED>::load(&_is_unloading_state);
bool state_is_unloading = IsUnloadingState::is_unloading(state);
uint8_t state_unloading_cycle = IsUnloadingState::unloading_cycle(state);
if (state_is_unloading) {
return true;
}
if (state_unloading_cycle == CodeCache::unloading_cycle()) {
return false;
}
// The IsUnloadingBehaviour is responsible for checking if there are any dead
// oops in the CompiledMethod, by calling oops_do on it.
state_unloading_cycle = CodeCache::unloading_cycle();
state_is_unloading = IsUnloadingBehaviour::current()->is_unloading(this);
state = IsUnloadingState::create(state_is_unloading, state_unloading_cycle);
RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
return state_is_unloading;
}
void nmethod::clear_unloading_state() {
uint8_t state = IsUnloadingState::create(false, CodeCache::unloading_cycle());
RawAccess<MO_RELAXED>::store(&_is_unloading_state, state);
}
// This is called at the end of the strong tracing/marking phase of a
// GC to unload an nmethod if it contains otherwise unreachable