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Use setjmp/longjmp to handle LLVM exceptions.

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This commit is contained in:
losfair
2019-08-07 00:06:35 +08:00
parent 180522095f
commit b50fd31adb
2 changed files with 47 additions and 5 deletions
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35
lib/llvm-backend/cpp/object_loader.cpp
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@ -5,6 +5,41 @@
extern "C" void __register_frame(uint8_t *);
extern "C" void __deregister_frame(uint8_t *);
struct UnwindPoint {
UnwindPoint *prev;
jmp_buf unwind_info;
std::unique_ptr<std::exception> exception;
};
static thread_local UnwindPoint *unwind_state = nullptr;
void catch_unwind(std::function<void()>&& f) {
UnwindPoint current;
current.prev = unwind_state;
unwind_state = &current;
bool rethrow = false;
if(setjmp(current.unwind_info)) {
rethrow = true;
} else {
f();
}
unwind_state = current.prev;
if(rethrow) throw *current.exception;
}
void unsafe_unwind(std::exception *exception) {
UnwindPoint *state = unwind_state;
if(state) {
state->exception.reset(exception);
longjmp(state->unwind_info, 42);
} else {
abort();
}
}
struct MemoryManager : llvm::RuntimeDyld::MemoryManager {
public:
MemoryManager(callbacks_t callbacks) : callbacks(callbacks) {}