move default handlers to their own file so they can be overridden at build time (dyld)

git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@152770 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 98 insertions, 0 deletions

diff --git a/src/cxa_default_handlers.cpp b/src/cxa_default_handlers.cpp
new file mode 100644
index 0000000..ae18b3e
--- /dev/null
+++ b/src/cxa_default_handlers.cpp
@@ -0,0 +1,98 @@
+//===------------------------- cxa_default_handlers.cpp -------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//
+// This file implements the default terminate_handler and unexpected_handler.
+//===----------------------------------------------------------------------===//
+
+#include <stdexcept>
+#include <new>
+#include <exception>
+#include "abort_message.h"
+#include "cxxabi.h"
+#include "cxa_handlers.hpp"
+#include "cxa_exception.hpp"
+#include "private_typeinfo.h"
+#include "cxa_default_handlers.hpp"
+
+__attribute__((noreturn))
+static void default_handler(const char* cause)
+{
+    // If there might be an uncaught exception
+    using namespace __cxxabiv1;
+    __cxa_eh_globals* globals = __cxa_get_globals_fast();
+    if (globals)
+    {
+        __cxa_exception* exception_header = globals->caughtExceptions;
+        // If there is an uncaught exception
+        if (exception_header)
+        {
+            _Unwind_Exception* unwind_exception =
+                reinterpret_cast<_Unwind_Exception*>(exception_header + 1) - 1;
+            bool native_exception =
+                (unwind_exception->exception_class   & get_vendor_and_language) == 
+                                 (kOurExceptionClass & get_vendor_and_language);
+            if (native_exception)
+            {
+                void* thrown_object =
+                    unwind_exception->exception_class == kOurDependentExceptionClass ?
+                        ((__cxa_dependent_exception*)exception_header)->primaryException :
+                        exception_header + 1;
+                const __shim_type_info* thrown_type =
+                    static_cast<const __shim_type_info*>(exception_header->exceptionType);
+                // Try to get demangled name of thrown_type
+                int status;
+                char buf[1024];
+                size_t len = sizeof(buf);
+                const char* name = __cxa_demangle(thrown_type->name(), buf, &len, &status);
+                if (status != 0)
+                    name = thrown_type->name();
+                // If the uncaught exception can be caught with std::exception&
+                const __shim_type_info* catch_type =
+				 static_cast<const __shim_type_info*>(&typeid(std::exception));
+                if (catch_type->can_catch(thrown_type, thrown_object))
+                {
+                    // Include the what() message from the exception
+                    const std::exception* e = static_cast<const std::exception*>(thrown_object);
+                    abort_message("terminating with %s exception of type %s: %s",
+                                  cause, name, e->what());
+                }
+                else
+                    // Else just note that we're terminating with an exception
+                    abort_message("terminating with %s exception of type %s",
+                                   cause, name);
+            }
+            else
+                // Else we're terminating with a foreign exception
+                abort_message("terminating with %s foreign exception", cause);
+        }
+    }
+    // Else just note that we're terminating
+    abort_message("terminating");
+}
+
+
+__attribute__((visibility("hidden"), noreturn))
+void default_terminate_handler() 
+{
+	default_handler("terminate");
+}
+
+__attribute__((visibility("hidden"), noreturn))
+void default_unexpected_handler() 
+{
+	default_handler("unexpected");
+}
+
+
+//
+// Global variables that hold the pointers to the current handler
+//
+std::terminate_handler  __cxa_terminate_handler = default_terminate_handler;
+std::unexpected_handler __cxa_unexpected_handler = default_unexpected_handler;
+std::new_handler __cxa_new_handler = 0;
+