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