Workaround broken JIT exceptions, use longjmp instead.

include/cling/Interpreter/Interpreter.h

@@ -15,6 +15,9 @@
 #include <string>
 #include <cstdlib>
 
+// FIXME: workaround until JIT supports exceptions
+#include <setjmp.h>
+
 namespace llvm {
   class raw_ostream;
   struct GenericValue;
@@ -171,6 +174,9 @@ namespace cling {
     ///
     mutable std::vector<ClangInternalState*> m_StoredStates;
 
+    ///\brief: FIXME: workaround until JIT supports exceptions
+    static jmp_buf* m_JumpBuf;
+
     ///\brief Processes the invocation options.
     ///
     void handleFrontendOptions();
@@ -581,6 +587,9 @@ namespace cling {
     friend int runtime::internal::local_cxa_atexit(void (*func) (void*), 
                                                    void* arg, void* dso,
                                                    void* interp);
+
+    // FIXME: workaround until JIT supports exceptions
+    static jmp_buf*& getNullDerefJump() { return m_JumpBuf; }
   };
 
   namespace internal {

lib/Interpreter/Interpreter.cpp

@@ -81,6 +81,10 @@ namespace cling {
 
 
 namespace cling {
+
+  // FIXME: workaround until JIT supports exceptions
+  jmp_buf* Interpreter::m_JumpBuf;
+
 #if (!_WIN32)
   // "Declared" to the JIT in RuntimeUniverse.h
   namespace runtime {

lib/Interpreter/RuntimeException.cpp

@@ -7,6 +7,7 @@
 
 #include "cling/Interpreter/RuntimeException.h"
 
+#include "cling/Interpreter/Interpreter.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Sema/Sema.h"
 #include "clang/Sema/SemaDiagnostic.h"
@@ -15,7 +16,12 @@ extern "C" {
 void cling__runtime__internal__throwNullDerefException(void* Sema, void* Expr) {
   clang::Sema* S = (clang::Sema*)Sema;
   clang::Expr* E = (clang::Expr*)Expr;
-  throw cling::runtime::NullDerefException(S, E);
+
+  // FIXME: workaround until JIT supports exceptions
+  //throw cling::runtime::NullDerefException(S, E);
+  S->Diag(E->getLocStart(), clang::diag::warn_null_arg) << E->getSourceRange();
+  if (cling::Interpreter::getNullDerefJump())
+    longjmp(*cling::Interpreter::getNullDerefJump(), 1);
 }
 }
 

lib/UserInterface/UserInterface.cpp

@@ -111,6 +111,14 @@ namespace cling {
 
     TI.SetPrompt("[cling]$ ");
     std::string line;
+
+    jmp_buf env;
+    int val = setjmp(env);
+    if (!val) {
+      Interpreter::getNullDerefJump() = &env;
+    } else {
+      llvm::errs() << "LongJmp occurred. Recovering...\n";
+    }
     while (true) {
       try {
         m_MetaProcessor->getOuts().flush();