Move language independent exception handling routines OUT of C++Exception.cpp

llvm-svn: 8232

1 files changed, 57 insertions, 0 deletions

diff --git a/llvm/runtime/GCCLibraries/libexception/Exception.cpp b/llvm/runtime/GCCLibraries/libexception/Exception.cpp
new file mode 100644
index 00000000000..156b714cb1a
--- /dev/null
+++ b/llvm/runtime/GCCLibraries/libexception/Exception.cpp
@@ -0,0 +1,57 @@
+//===- Exception.cpp - Generic language-independent exceptions ------------===//
+//
+// This file defines the the shared data structures used by all language
+// specific exception handling runtime libraries.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Exception.h"
+#include <cassert>
+
+// Thread local state for exception handling.  FIXME: This should really be made
+// thread-local!
+
+// UncaughtExceptionStack - The stack of exceptions currently being thrown.
+static llvm_exception *UncaughtExceptionStack = 0;
+
+// __llvm_eh_has_uncaught_exception - This is used to implement
+// std::uncaught_exception.
+//
+bool __llvm_eh_has_uncaught_exception() throw() {
+  return UncaughtExceptionStack != 0;
+}
+
+// __llvm_eh_current_uncaught_exception - This function checks to see if the
+// current uncaught exception is of the specified language type.  If so, it
+// returns a pointer to the exception area data.
+//
+void *__llvm_eh_current_uncaught_exception_type(unsigned HandlerType) throw() {
+  assert(UncaughtExceptionStack && "No uncaught exception!");
+  if (UncaughtExceptionStack->ExceptionType == HandlerType)
+    return UncaughtExceptionStack+1;
+  return 0;
+}
+
+// __llvm_eh_add_uncaught_exception - This adds the specified exception to the
+// top of the uncaught exception stack.  The exception should not already be on
+// the stack!
+void __llvm_eh_add_uncaught_exception(llvm_exception *E) throw() {
+  E->Next = UncaughtExceptionStack;
+  UncaughtExceptionStack = E;
+}
+
+
+// __llvm_eh_get_uncaught_exception - Returns the current uncaught exception.
+// There must be an uncaught exception for this to work!
+llvm_exception *__llvm_eh_get_uncaught_exception() throw() {
+  assert(UncaughtExceptionStack && "There are no uncaught exceptions!?!?");
+  return UncaughtExceptionStack;
+}
+
+// __llvm_eh_pop_from_uncaught_stack - Remove the current uncaught exception
+// from the top of the stack.
+llvm_exception *__llvm_eh_pop_from_uncaught_stack() throw() {
+  llvm_exception *E = __llvm_eh_get_uncaught_exception();
+  UncaughtExceptionStack = E->Next;
+  return E;
+}