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//===- SJLJ-exception.h - SetJmp/LongJmp Exception Handling -----*- C++ -*-===//
//
// This file defines the data structures and API used by the Setjmp/Longjmp
// exception handling runtime library.
//
//===----------------------------------------------------------------------===//
#ifndef SJLJ_EXCEPTION_H
#define SJLJ_EXCEPTION_H
#include "exception.h"
#include <cassert>
struct llvm_sjlj_exception {
// JmpBuffer - This is the buffer which was longjmp'd with.
//
void *JmpBuffer;
// LongJmpValue - The value passed into longjmp, which the corresponding
// setjmp should return. Note that this value will never be equal to 0.
//
int LongJmpValue;
// BaseException - The language independent portion of the exception state.
// This is at the end of the record so that we can add additional members to
// this structure without breaking binary compatibility.
//
llvm_exception BaseException;
};
extern "C" {
// __llvm_sjljeh_throw_longjmp - This function creates the longjmp exception
// and returns. It takes care of mapping the longjmp value from 0 -> 1 as
// appropriate. The caller should immediately call llvm.unwind after this
// function call.
void __llvm_sjljeh_throw_longjmp(void *JmpBuffer, int Val) throw();
// __llvm_sjljeh_init_setjmpmap - This funciton initializes the pointer
// provided to an empty setjmp map, and should be called on entry to a
// function which calls setjmp.
void __llvm_sjljeh_init_setjmpmap(void **SetJmpMap) throw();
// __llvm_sjljeh_destroy_setjmpmap - This function frees all memory associated
// with the specified setjmpmap structure. It should be called on all exits
// (returns or unwinds) from the function which calls ...init_setjmpmap.
void __llvm_sjljeh_destroy_setjmpmap(void **SetJmpMap) throw();
// __llvm_sjljeh_add_setjmp_to_map - This function adds or updates an entry to
// the map, to indicate which setjmp should be returned to if a longjmp
// happens.
void __llvm_sjljeh_add_setjmp_to_map(void **SetJmpMap, void *JmpBuf,
unsigned SetJmpID) throw();
// __llvm_sjljeh_is_longjmp_exception - This function returns true if the
// current uncaught exception is a longjmp exception. This is the first step
// of catching a sjlj exception.
bool __llvm_sjljeh_is_longjmp_exception() throw();
// __llvm_sjljeh_get_longjmp_value - This function returns the value that the
// setjmp call should "return". This requires that the current uncaught
// exception be a sjlj exception, though it does not require the exception to
// be caught by this function.
int __llvm_sjljeh_get_longjmp_value() throw();
// __llvm_sjljeh_try_catching_longjmp_exception - This function checks to see
// if the current uncaught longjmp exception matches any of the setjmps
// collected in the setjmpmap structure. If so, it catches and destroys the
// exception, returning the index of the setjmp which caught the exception.
// If not, it leaves the exception uncaught and returns a value of ~0.
unsigned __llvm_sjljeh_try_catching_longjmp_exception(void **SetJmpMap)
throw();
}
#endif
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