mirror of
https://github.com/c64scene-ar/llvm-6502.git
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* Add proper support for rethrown exceptions.
* Make catch_begin() produce a pointer that must be passed to catch_end() * Eliminate the caught exception stack. * Add optional debugging code that may be turned on. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8184 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
parent
902d580bd9
commit
b40d5e7d94
@ -11,6 +11,12 @@
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#include <cstdlib>
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#include <cstdarg>
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//#define DEBUG
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#ifdef DEBUG
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#include <stdio.h>
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#endif
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//===----------------------------------------------------------------------===//
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// Generic exception support
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//
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@ -18,7 +24,11 @@
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// Thread local state for exception handling.
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// FIXME: This should really be made thread-local!
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//
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static llvm_exception *CaughtExceptionStack = 0;
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// LastCaughtException - The last exception caught by this handler. This is for
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// implementation of _rethrow and _get_last_caught.
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//
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static llvm_exception *LastCaughtException = 0;
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// UncaughtExceptionStack - The stack of exceptions currently being thrown.
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static llvm_exception *UncaughtExceptionStack = 0;
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@ -76,13 +86,9 @@ void __llvm_cxxeh_free_exception(void *ObjectPtr) throw() {
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// exception.
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//
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static void cxx_destructor(llvm_exception *LE) /* might throw */{
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assert(LE->Next == 0 && "On the uncaught stack??");
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llvm_cxx_exception *E = get_cxx_exception(LE);
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// The exception is no longer caught.
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assert(CaughtExceptionStack == LE &&
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"Destroying an exception which is not the current caught exception?");
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CaughtExceptionStack = LE->Next;
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struct ExceptionFreer {
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void *Ptr;
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ExceptionFreer(void *P) : Ptr(P) {}
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@ -110,6 +116,7 @@ void __llvm_cxxeh_throw(void *ObjectPtr, void *TypeInfoPtr,
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E->BaseException.Next = UncaughtExceptionStack;
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UncaughtExceptionStack = &E->BaseException;
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E->BaseException.HandlerCount = 0;
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E->BaseException.isRethrown = 0;
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E->TypeInfo = (const std::type_info*)TypeInfoPtr;
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E->ExceptionObjectDestructor = DtorPtr;
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@ -121,14 +128,16 @@ void __llvm_cxxeh_throw(void *ObjectPtr, void *TypeInfoPtr,
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// CXXExceptionISA - use the type info object stored in the exception to see if
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// TypeID matches and, if so, to adjust the exception object pointer.
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//
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static void *CXXExceptionISA(llvm_cxx_exception *E, const std::type_info *Type){
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static void *CXXExceptionISA(llvm_cxx_exception *E,
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const std::type_info *Type) throw() {
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// ThrownPtr is a pointer to the object being thrown...
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void *ThrownPtr = E+1;
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const std::type_info *ThrownType = E->TypeInfo;
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#if 0
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// FIXME: this code exists in the GCC exception handling library: I haven't
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// thought about this yet, so it should be verified at some point!
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#if 1
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// Pointer types need to adjust the actual pointer, not
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// the pointer to pointer that is the exception object.
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// This also has the effect of passing pointer types
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@ -137,8 +146,13 @@ static void *CXXExceptionISA(llvm_cxx_exception *E, const std::type_info *Type){
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ThrownPtr = *(void **)ThrownPtr;
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#endif
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if (Type->__do_catch(ThrownType, &ThrownPtr, 1))
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if (Type->__do_catch(ThrownType, &ThrownPtr, 1)) {
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#ifdef DEBUG
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printf("isa<%s>(%s): 0x%p -> 0x%p\n", Type->name(), ThrownType->name(),
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E+1, ThrownPtr);
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#endif
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return ThrownPtr;
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}
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return 0;
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}
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@ -175,11 +189,17 @@ void *__llvm_cxxeh_begin_catch() throw() {
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UncaughtExceptionStack = E->Next;
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// The exception is now caught.
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E->Next = CaughtExceptionStack;
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CaughtExceptionStack = E;
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LastCaughtException = E;
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E->Next = 0;
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E->isRethrown = 0;
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// Increment the handler count for this exception.
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E->HandlerCount++;
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#ifdef DEBUG
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printf("Exiting begin_catch Ex=0x%p HandlerCount=%d!\n", E+1,
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E->HandlerCount);
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#endif
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// Return a pointer to the raw exception object.
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return E+1;
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@ -200,22 +220,44 @@ void *__llvm_cxxeh_begin_catch_if_isa(void *CatchType) throw() {
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return ObjPtr;
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}
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// __llvm_cxxeh_get_last_caught - Return the last exception that was caught by
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// ...begin_catch.
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//
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void *__llvm_cxxeh_get_last_caught() throw() {
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assert(LastCaughtException && "No exception caught!!");
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return LastCaughtException+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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void __llvm_cxxeh_end_catch() /* might throw */ {
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llvm_exception *E = CaughtExceptionStack;
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void __llvm_cxxeh_end_catch(void *Ex) /* might throw */ {
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llvm_exception *E = (llvm_exception*)Ex - 1;
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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 (--E->HandlerCount == 0)
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if (--E->HandlerCount == 0 && !E->isRethrown) {
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#ifdef DEBUG
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printf("Destroying exception!\n");
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#endif
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E->ExceptionDestructor(E); // Release memory for the exception
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}
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#ifdef DEBUG
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printf("Exiting end_catch Ex=0x%p HandlerCount=%d!\n", Ex, E->HandlerCount);
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#endif
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}
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// __llvm_cxxeh_call_terminate - This function is called when the dtor for an
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// object being destroyed due to an exception throw throws an exception. This
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// is illegal because it would cause multiple exceptions to be active at one
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// time.
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void __llvm_cxxeh_call_terminate() throw() {
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__terminate(__terminate_handler);
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void (*Handler)(void) = __terminate_handler;
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if (UncaughtExceptionStack)
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if (UncaughtExceptionStack->ExceptionType == CXXException)
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Handler = get_cxx_exception(UncaughtExceptionStack)->TerminateHandler;
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__terminate(Handler);
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}
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@ -225,19 +267,21 @@ void __llvm_cxxeh_call_terminate() throw() {
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// prepared to deal with foreign exceptions.
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//
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void __llvm_cxxeh_rethrow() throw() {
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llvm_exception *E = CaughtExceptionStack;
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llvm_exception *E = LastCaughtException;
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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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// 15.1.8 - If there are no exceptions being thrown, 'throw;' should call
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// terminate.
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//
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__terminate(__terminate_handler);
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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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// Otherwise we have an exception to rethrow. Mark the exception as such.
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E->isRethrown = 1;
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// Add the exception to the top of the uncaught stack, to preserve the
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// invariant that the top of the uncaught stack is the current exception.
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E->Next = UncaughtExceptionStack;
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UncaughtExceptionStack = E;
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// Return to the caller, which should perform the unwind now.
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}
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@ -283,8 +327,8 @@ void __llvm_cxxeh_check_eh_spec(void *Info, ...) {
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// Whatever exception this is, it is not allowed by the (empty) spec, call
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// unexpected, according to 15.4.8.
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try {
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__llvm_cxxeh_begin_catch(); // Start the catch
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__llvm_cxxeh_end_catch(); // Free the exception
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void *Ex = __llvm_cxxeh_begin_catch(); // Start the catch
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__llvm_cxxeh_end_catch(Ex); // Free the exception
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__unexpected(__unexpected_handler);
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} catch (...) {
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// Any exception thrown by unexpected cannot match the ehspec. Call
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@ -307,10 +351,10 @@ void __llvm_cxxeh_check_eh_spec(void *Info, ...) {
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// permitted to pass through) or not a C++ exception that is allowed. Kill
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// the exception and call the unexpected handler.
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try {
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__llvm_cxxeh_begin_catch(); // Start the catch
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__llvm_cxxeh_end_catch(); // Free the exception
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void *Ex = __llvm_cxxeh_begin_catch(); // Start the catch
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__llvm_cxxeh_end_catch(Ex); // Free the exception
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} catch (...) {
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__terminate(__terminate_handler); // Exception dtor threw
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__terminate(__terminate_handler); // Exception dtor threw
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}
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try {
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@ -55,7 +55,7 @@ inline llvm_cxx_exception *get_cxx_exception(llvm_exception *E) throw() {
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namespace __cxxabiv1 {
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// Invokes given handler, dying appropriately if the user handler was
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// so inconsiderate as to return.
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extern void __terminate(std::terminate_handler) __attribute__((noreturn));
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extern void __terminate(std::terminate_handler) throw() __attribute__((noreturn));
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extern void __unexpected(std::unexpected_handler) __attribute__((noreturn));
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// The current installed user handlers.
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@ -74,8 +74,10 @@ extern "C" {
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throw();
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void *__llvm_cxxeh_begin_catch() throw();
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void *__llvm_cxxeh_begin_catch_if_isa(void *CatchType) throw();
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void __llvm_cxxeh_end_catch() /* might throw */;
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void __llvm_cxxeh_end_catch(void *Exception) /* might throw */;
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void __llvm_cxxeh_rethrow() throw();
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void *__llvm_cxxeh_get_last_caught() throw();
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void __llvm_cxxeh_check_eh_spec(void *Info, ...);
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}
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@ -31,6 +31,14 @@ struct llvm_exception {
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// falls to zero, the exception is destroyed.
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//
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unsigned HandlerCount;
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// isRethrown - This field is set on an exception if it has been 'throw;'n.
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// This is needed because the exception might exit through a number of the
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// end_catch statements matching the number of begin_catch statements that
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// have been processed. When this happens, the exception should become
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// uncaught, not dead.
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//
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int isRethrown;
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};
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enum {
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@ -11,6 +11,12 @@
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#include <cstdlib>
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#include <cstdarg>
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//#define DEBUG
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#ifdef DEBUG
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#include <stdio.h>
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#endif
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//===----------------------------------------------------------------------===//
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// Generic exception support
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//
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@ -18,7 +24,11 @@
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// Thread local state for exception handling.
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// FIXME: This should really be made thread-local!
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//
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static llvm_exception *CaughtExceptionStack = 0;
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// LastCaughtException - The last exception caught by this handler. This is for
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// implementation of _rethrow and _get_last_caught.
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//
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static llvm_exception *LastCaughtException = 0;
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// UncaughtExceptionStack - The stack of exceptions currently being thrown.
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static llvm_exception *UncaughtExceptionStack = 0;
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@ -76,13 +86,9 @@ void __llvm_cxxeh_free_exception(void *ObjectPtr) throw() {
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// exception.
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//
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static void cxx_destructor(llvm_exception *LE) /* might throw */{
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assert(LE->Next == 0 && "On the uncaught stack??");
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llvm_cxx_exception *E = get_cxx_exception(LE);
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// The exception is no longer caught.
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assert(CaughtExceptionStack == LE &&
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"Destroying an exception which is not the current caught exception?");
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CaughtExceptionStack = LE->Next;
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struct ExceptionFreer {
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void *Ptr;
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ExceptionFreer(void *P) : Ptr(P) {}
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@ -110,6 +116,7 @@ void __llvm_cxxeh_throw(void *ObjectPtr, void *TypeInfoPtr,
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E->BaseException.Next = UncaughtExceptionStack;
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UncaughtExceptionStack = &E->BaseException;
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E->BaseException.HandlerCount = 0;
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E->BaseException.isRethrown = 0;
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E->TypeInfo = (const std::type_info*)TypeInfoPtr;
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E->ExceptionObjectDestructor = DtorPtr;
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@ -121,14 +128,16 @@ void __llvm_cxxeh_throw(void *ObjectPtr, void *TypeInfoPtr,
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// CXXExceptionISA - use the type info object stored in the exception to see if
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// TypeID matches and, if so, to adjust the exception object pointer.
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//
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static void *CXXExceptionISA(llvm_cxx_exception *E, const std::type_info *Type){
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static void *CXXExceptionISA(llvm_cxx_exception *E,
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const std::type_info *Type) throw() {
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// ThrownPtr is a pointer to the object being thrown...
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void *ThrownPtr = E+1;
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const std::type_info *ThrownType = E->TypeInfo;
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#if 0
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// FIXME: this code exists in the GCC exception handling library: I haven't
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// thought about this yet, so it should be verified at some point!
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#if 1
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// Pointer types need to adjust the actual pointer, not
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// the pointer to pointer that is the exception object.
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// This also has the effect of passing pointer types
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@ -137,8 +146,13 @@ static void *CXXExceptionISA(llvm_cxx_exception *E, const std::type_info *Type){
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ThrownPtr = *(void **)ThrownPtr;
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#endif
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if (Type->__do_catch(ThrownType, &ThrownPtr, 1))
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if (Type->__do_catch(ThrownType, &ThrownPtr, 1)) {
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#ifdef DEBUG
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printf("isa<%s>(%s): 0x%p -> 0x%p\n", Type->name(), ThrownType->name(),
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E+1, ThrownPtr);
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#endif
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return ThrownPtr;
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}
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return 0;
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}
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@ -175,11 +189,17 @@ void *__llvm_cxxeh_begin_catch() throw() {
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UncaughtExceptionStack = E->Next;
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// The exception is now caught.
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E->Next = CaughtExceptionStack;
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CaughtExceptionStack = E;
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LastCaughtException = E;
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E->Next = 0;
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E->isRethrown = 0;
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// Increment the handler count for this exception.
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E->HandlerCount++;
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#ifdef DEBUG
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printf("Exiting begin_catch Ex=0x%p HandlerCount=%d!\n", E+1,
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E->HandlerCount);
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#endif
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// Return a pointer to the raw exception object.
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return E+1;
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@ -200,22 +220,44 @@ void *__llvm_cxxeh_begin_catch_if_isa(void *CatchType) throw() {
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return ObjPtr;
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}
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// __llvm_cxxeh_get_last_caught - Return the last exception that was caught by
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// ...begin_catch.
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//
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void *__llvm_cxxeh_get_last_caught() throw() {
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assert(LastCaughtException && "No exception caught!!");
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return LastCaughtException+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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void __llvm_cxxeh_end_catch() /* might throw */ {
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llvm_exception *E = CaughtExceptionStack;
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void __llvm_cxxeh_end_catch(void *Ex) /* might throw */ {
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llvm_exception *E = (llvm_exception*)Ex - 1;
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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 (--E->HandlerCount == 0)
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if (--E->HandlerCount == 0 && !E->isRethrown) {
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#ifdef DEBUG
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printf("Destroying exception!\n");
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#endif
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E->ExceptionDestructor(E); // Release memory for the exception
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}
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#ifdef DEBUG
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printf("Exiting end_catch Ex=0x%p HandlerCount=%d!\n", Ex, E->HandlerCount);
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#endif
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}
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// __llvm_cxxeh_call_terminate - This function is called when the dtor for an
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// object being destroyed due to an exception throw throws an exception. This
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// is illegal because it would cause multiple exceptions to be active at one
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// time.
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void __llvm_cxxeh_call_terminate() throw() {
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__terminate(__terminate_handler);
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void (*Handler)(void) = __terminate_handler;
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if (UncaughtExceptionStack)
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if (UncaughtExceptionStack->ExceptionType == CXXException)
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Handler = get_cxx_exception(UncaughtExceptionStack)->TerminateHandler;
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__terminate(Handler);
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}
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@ -225,19 +267,21 @@ void __llvm_cxxeh_call_terminate() throw() {
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// prepared to deal with foreign exceptions.
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//
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void __llvm_cxxeh_rethrow() throw() {
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llvm_exception *E = CaughtExceptionStack;
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llvm_exception *E = LastCaughtException;
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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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// 15.1.8 - If there are no exceptions being thrown, 'throw;' should call
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// terminate.
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//
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__terminate(__terminate_handler);
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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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// Otherwise we have an exception to rethrow. Mark the exception as such.
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E->isRethrown = 1;
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// Add the exception to the top of the uncaught stack, to preserve the
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// invariant that the top of the uncaught stack is the current exception.
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E->Next = UncaughtExceptionStack;
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UncaughtExceptionStack = E;
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// Return to the caller, which should perform the unwind now.
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}
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@ -283,8 +327,8 @@ void __llvm_cxxeh_check_eh_spec(void *Info, ...) {
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// Whatever exception this is, it is not allowed by the (empty) spec, call
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// unexpected, according to 15.4.8.
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try {
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__llvm_cxxeh_begin_catch(); // Start the catch
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__llvm_cxxeh_end_catch(); // Free the exception
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void *Ex = __llvm_cxxeh_begin_catch(); // Start the catch
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__llvm_cxxeh_end_catch(Ex); // Free the exception
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__unexpected(__unexpected_handler);
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} catch (...) {
|
||||
// Any exception thrown by unexpected cannot match the ehspec. Call
|
||||
@ -307,10 +351,10 @@ void __llvm_cxxeh_check_eh_spec(void *Info, ...) {
|
||||
// permitted to pass through) or not a C++ exception that is allowed. Kill
|
||||
// the exception and call the unexpected handler.
|
||||
try {
|
||||
__llvm_cxxeh_begin_catch(); // Start the catch
|
||||
__llvm_cxxeh_end_catch(); // Free the exception
|
||||
void *Ex = __llvm_cxxeh_begin_catch(); // Start the catch
|
||||
__llvm_cxxeh_end_catch(Ex); // Free the exception
|
||||
} catch (...) {
|
||||
__terminate(__terminate_handler); // Exception dtor threw
|
||||
__terminate(__terminate_handler); // Exception dtor threw
|
||||
}
|
||||
|
||||
try {
|
||||
|
||||
@ -55,7 +55,7 @@ inline llvm_cxx_exception *get_cxx_exception(llvm_exception *E) throw() {
|
||||
namespace __cxxabiv1 {
|
||||
// Invokes given handler, dying appropriately if the user handler was
|
||||
// so inconsiderate as to return.
|
||||
extern void __terminate(std::terminate_handler) __attribute__((noreturn));
|
||||
extern void __terminate(std::terminate_handler) throw() __attribute__((noreturn));
|
||||
extern void __unexpected(std::unexpected_handler) __attribute__((noreturn));
|
||||
|
||||
// The current installed user handlers.
|
||||
@ -74,8 +74,10 @@ extern "C" {
|
||||
throw();
|
||||
void *__llvm_cxxeh_begin_catch() throw();
|
||||
void *__llvm_cxxeh_begin_catch_if_isa(void *CatchType) throw();
|
||||
void __llvm_cxxeh_end_catch() /* might throw */;
|
||||
void __llvm_cxxeh_end_catch(void *Exception) /* might throw */;
|
||||
void __llvm_cxxeh_rethrow() throw();
|
||||
void *__llvm_cxxeh_get_last_caught() throw();
|
||||
|
||||
void __llvm_cxxeh_check_eh_spec(void *Info, ...);
|
||||
}
|
||||
|
||||
|
||||
@ -31,6 +31,14 @@ struct llvm_exception {
|
||||
// falls to zero, the exception is destroyed.
|
||||
//
|
||||
unsigned HandlerCount;
|
||||
|
||||
// isRethrown - This field is set on an exception if it has been 'throw;'n.
|
||||
// This is needed because the exception might exit through a number of the
|
||||
// end_catch statements matching the number of begin_catch statements that
|
||||
// have been processed. When this happens, the exception should become
|
||||
// uncaught, not dead.
|
||||
//
|
||||
int isRethrown;
|
||||
};
|
||||
|
||||
enum {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user