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Add new __llvm_cxxeh_begin_catch_if_isa function, change C -> C++ comments
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8150 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
parent
0320b1406e
commit
23b9b05fd3
@ -42,9 +42,9 @@ void *__llvm_eh_current_uncaught_exception_type(unsigned HandlerType) {
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}
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/*===----------------------------------------------------------------------===**
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* C++ Specific exception handling support...
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*/
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//===----------------------------------------------------------------------===//
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// C++ Specific exception handling support...
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//
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// __llvm_cxxeh_allocate_exception - This function allocates space for the
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// specified number of bytes, plus a C++ exception object header.
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@ -113,8 +113,8 @@ void __llvm_cxxeh_throw(void *ObjectPtr, const std::type_info *TypeInfoPtr,
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E->TypeInfo = TypeInfoPtr;
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E->ExceptionObjectDestructor = DtorPtr;
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E->UnexpectedHandler = 0; /* FIXME */
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E->TerminateHandler = 0; /* FIXME */
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E->UnexpectedHandler = 0; // FIXME
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E->TerminateHandler = 0; // FIXME
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}
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// __llvm_cxxeh_current_uncaught_exception_isa - This function checks to see if
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@ -126,7 +126,7 @@ void *__llvm_cxxeh_current_uncaught_exception_isa(
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const std::type_info *CatchType) {
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assert(UncaughtExceptionStack && "No uncaught exception!");
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if (UncaughtExceptionStack->ExceptionType != CXXException)
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return 0; /* If it's not a c++ exception, it doesn't match! */
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return 0; // If it's not a c++ exception, it doesn't match!
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// If it is a C++ exception, use the type info object stored in the exception
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// to see if TypeID matches and, if so, to adjust the exception object
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@ -156,68 +156,83 @@ void *__llvm_cxxeh_current_uncaught_exception_isa(
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}
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/* __llvm_cxxeh_begin_catch - This function is called by "exception handlers",
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* which transition an exception from being uncaught to being caught. It
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* returns a pointer to the exception object portion of the exception. This
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* function must work with foreign exceptions.
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*/
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// __llvm_cxxeh_begin_catch - This function is called by "exception handlers",
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// which transition an exception from being uncaught to being caught. It
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// returns a pointer to the exception object portion of the exception. This
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// function must work with foreign exceptions.
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//
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void *__llvm_cxxeh_begin_catch(void) {
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llvm_exception *E = UncaughtExceptionStack;
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assert(UncaughtExceptionStack && "There are no uncaught exceptions!?!?");
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/* The exception is now no longer uncaught... */
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// The exception is now no longer uncaught.
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UncaughtExceptionStack = E->Next;
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/* The exception is now caught... */
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// The exception is now caught.
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E->Next = CaughtExceptionStack;
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CaughtExceptionStack = E->Next;
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/* Increment the handler count for this exception. */
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// Increment the handler count for this exception.
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E->HandlerCount++;
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/* Return a pointer to the exception object */
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// Return a pointer to the raw exception object.
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return E+1;
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}
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/* __llvm_cxxeh_end_catch - This function decrements the HandlerCount of the
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* top-level caught exception, destroying it if this is the last handler for the
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* exception.
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*/
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// __llvm_cxxeh_begin_catch_if_isa - This function checks to see if the current
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// uncaught exception is of the specified type. If not, it returns a null
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// pointer, otherwise it 'catches' the exception and returns a pointer to the
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// object of the specified type. This function does never succeeds with foreign
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// exceptions (because they can never be of type CatchType).
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//
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void *__llvm_cxxeh_begin_catch_if_isa(const std::type_info *CatchType) {
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void *ObjPtr = __llvm_cxxeh_current_uncaught_exception_isa(CatchType);
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if (!ObjPtr) return 0;
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// begin_catch, meaning that the object is now "caught", not "uncaught"
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__llvm_cxxeh_begin_catch();
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return ObjPtr;
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}
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// __llvm_cxxeh_end_catch - This function decrements the HandlerCount of the
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// top-level caught exception, destroying it if this is the last handler for the
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// exception.
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//
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void __llvm_cxxeh_end_catch(void) {
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llvm_exception *E = CaughtExceptionStack;
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assert(E && "There are no caught exceptions!");
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/* If this is the last handler using the exception, destroy it now! */
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// If this is the last handler using the exception, destroy it now!
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if (--E->HandlerCount == 0) {
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CaughtExceptionStack = E->Next; /* Unlink from the stack */
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E->ExceptionDestructor(E); /* Release memory for the exception */
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CaughtExceptionStack = E->Next; // Unlink from the stack
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E->ExceptionDestructor(E); // Release memory for the exception
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}
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}
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/* __llvm_cxxeh_rethrow - This function turns the top-level caught exception
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* into an uncaught exception, in preparation for an llvm.unwind, which should
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* follow immediately after the call to this function. This function must be
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* prepared to deal with foreign exceptions.
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*/
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// __llvm_cxxeh_rethrow - This function turns the top-level caught exception
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// into an uncaught exception, in preparation for an llvm.unwind, which should
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// follow immediately after the call to this function. This function must be
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// prepared to deal with foreign exceptions.
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//
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void __llvm_cxxeh_rethrow(void) {
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llvm_exception *E = CaughtExceptionStack;
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if (E == 0) {
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/* 15.1.8 - If there are no uncaught exceptions being thrown, 'throw;'
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* should call terminate.
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*/
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/* FIXME */assert(0 && "FIXME: this should call E->Terminate!");
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// 15.1.8 - If there are no uncaught exceptions being thrown, 'throw;'
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// should call terminate.
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//
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assert(0 && "FIXME: this should call E->Terminate!"); // FIXME!
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}
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/* Otherwise we have an exception to rethrow. Move it back to the uncaught
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* stack.
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*/
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// Otherwise we have an exception to rethrow. Move it back to the uncaught
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// stack.
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CaughtExceptionStack = E->Next;
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E->Next = UncaughtExceptionStack;
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UncaughtExceptionStack = E;
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/* Decrement the number of handlers which are using the exception. */
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// Decrement the number of handlers which are using the exception.
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--E->HandlerCount;
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/* Return to the caller, which should perform the unwind now. */
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// Return to the caller, which should perform the unwind now.
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}
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@ -54,6 +54,7 @@ extern "C" {
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void * __llvm_cxxeh_current_uncaught_exception_isa(const std::type_info *Ty);
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void *__llvm_cxxeh_begin_catch(void);
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void *__llvm_cxxeh_begin_catch_if_isa(const std::type_info *CatchType);
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void __llvm_cxxeh_end_catch(void);
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void __llvm_cxxeh_rethrow(void);
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@ -42,9 +42,9 @@ void *__llvm_eh_current_uncaught_exception_type(unsigned HandlerType) {
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}
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/*===----------------------------------------------------------------------===**
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* C++ Specific exception handling support...
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*/
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//===----------------------------------------------------------------------===//
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// C++ Specific exception handling support...
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//
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// __llvm_cxxeh_allocate_exception - This function allocates space for the
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// specified number of bytes, plus a C++ exception object header.
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@ -113,8 +113,8 @@ void __llvm_cxxeh_throw(void *ObjectPtr, const std::type_info *TypeInfoPtr,
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E->TypeInfo = TypeInfoPtr;
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E->ExceptionObjectDestructor = DtorPtr;
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E->UnexpectedHandler = 0; /* FIXME */
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E->TerminateHandler = 0; /* FIXME */
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E->UnexpectedHandler = 0; // FIXME
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E->TerminateHandler = 0; // FIXME
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}
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// __llvm_cxxeh_current_uncaught_exception_isa - This function checks to see if
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@ -126,7 +126,7 @@ void *__llvm_cxxeh_current_uncaught_exception_isa(
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const std::type_info *CatchType) {
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assert(UncaughtExceptionStack && "No uncaught exception!");
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if (UncaughtExceptionStack->ExceptionType != CXXException)
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return 0; /* If it's not a c++ exception, it doesn't match! */
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return 0; // If it's not a c++ exception, it doesn't match!
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// If it is a C++ exception, use the type info object stored in the exception
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// to see if TypeID matches and, if so, to adjust the exception object
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@ -156,68 +156,83 @@ void *__llvm_cxxeh_current_uncaught_exception_isa(
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}
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/* __llvm_cxxeh_begin_catch - This function is called by "exception handlers",
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* which transition an exception from being uncaught to being caught. It
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* returns a pointer to the exception object portion of the exception. This
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* function must work with foreign exceptions.
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*/
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// __llvm_cxxeh_begin_catch - This function is called by "exception handlers",
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// which transition an exception from being uncaught to being caught. It
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// returns a pointer to the exception object portion of the exception. This
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// function must work with foreign exceptions.
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//
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void *__llvm_cxxeh_begin_catch(void) {
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llvm_exception *E = UncaughtExceptionStack;
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assert(UncaughtExceptionStack && "There are no uncaught exceptions!?!?");
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/* The exception is now no longer uncaught... */
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// The exception is now no longer uncaught.
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UncaughtExceptionStack = E->Next;
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/* The exception is now caught... */
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// The exception is now caught.
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E->Next = CaughtExceptionStack;
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CaughtExceptionStack = E->Next;
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/* Increment the handler count for this exception. */
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// Increment the handler count for this exception.
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E->HandlerCount++;
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/* Return a pointer to the exception object */
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// Return a pointer to the raw exception object.
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return E+1;
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}
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/* __llvm_cxxeh_end_catch - This function decrements the HandlerCount of the
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* top-level caught exception, destroying it if this is the last handler for the
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* exception.
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*/
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// __llvm_cxxeh_begin_catch_if_isa - This function checks to see if the current
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// uncaught exception is of the specified type. If not, it returns a null
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// pointer, otherwise it 'catches' the exception and returns a pointer to the
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// object of the specified type. This function does never succeeds with foreign
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// exceptions (because they can never be of type CatchType).
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//
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void *__llvm_cxxeh_begin_catch_if_isa(const std::type_info *CatchType) {
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void *ObjPtr = __llvm_cxxeh_current_uncaught_exception_isa(CatchType);
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if (!ObjPtr) return 0;
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// begin_catch, meaning that the object is now "caught", not "uncaught"
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__llvm_cxxeh_begin_catch();
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return ObjPtr;
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}
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// __llvm_cxxeh_end_catch - This function decrements the HandlerCount of the
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// top-level caught exception, destroying it if this is the last handler for the
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// exception.
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//
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void __llvm_cxxeh_end_catch(void) {
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llvm_exception *E = CaughtExceptionStack;
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assert(E && "There are no caught exceptions!");
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/* If this is the last handler using the exception, destroy it now! */
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// If this is the last handler using the exception, destroy it now!
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if (--E->HandlerCount == 0) {
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CaughtExceptionStack = E->Next; /* Unlink from the stack */
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E->ExceptionDestructor(E); /* Release memory for the exception */
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CaughtExceptionStack = E->Next; // Unlink from the stack
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E->ExceptionDestructor(E); // Release memory for the exception
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}
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}
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/* __llvm_cxxeh_rethrow - This function turns the top-level caught exception
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* into an uncaught exception, in preparation for an llvm.unwind, which should
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* follow immediately after the call to this function. This function must be
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* prepared to deal with foreign exceptions.
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*/
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// __llvm_cxxeh_rethrow - This function turns the top-level caught exception
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// into an uncaught exception, in preparation for an llvm.unwind, which should
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// follow immediately after the call to this function. This function must be
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// prepared to deal with foreign exceptions.
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//
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void __llvm_cxxeh_rethrow(void) {
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llvm_exception *E = CaughtExceptionStack;
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if (E == 0) {
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/* 15.1.8 - If there are no uncaught exceptions being thrown, 'throw;'
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* should call terminate.
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*/
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/* FIXME */assert(0 && "FIXME: this should call E->Terminate!");
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// 15.1.8 - If there are no uncaught exceptions being thrown, 'throw;'
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// should call terminate.
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//
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assert(0 && "FIXME: this should call E->Terminate!"); // FIXME!
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}
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/* Otherwise we have an exception to rethrow. Move it back to the uncaught
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* stack.
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*/
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// Otherwise we have an exception to rethrow. Move it back to the uncaught
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// stack.
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CaughtExceptionStack = E->Next;
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E->Next = UncaughtExceptionStack;
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UncaughtExceptionStack = E;
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/* Decrement the number of handlers which are using the exception. */
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// Decrement the number of handlers which are using the exception.
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--E->HandlerCount;
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/* Return to the caller, which should perform the unwind now. */
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// Return to the caller, which should perform the unwind now.
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}
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@ -54,6 +54,7 @@ extern "C" {
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void * __llvm_cxxeh_current_uncaught_exception_isa(const std::type_info *Ty);
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void *__llvm_cxxeh_begin_catch(void);
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void *__llvm_cxxeh_begin_catch_if_isa(const std::type_info *CatchType);
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void __llvm_cxxeh_end_catch(void);
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void __llvm_cxxeh_rethrow(void);
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