Initial checkin of the SJLJ EH interface

llvm-svn: 8229

runtime/GCCLibraries/crtend/SJLJ-Exception.h

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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

runtime/GCCLibraries/libexception/SJLJ-Exception.h

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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