Update comments, if we are running with the CBE, make sure the Interp…

…reter

variable and the CBE variable are pointer equal.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11599 91177308-0d34-0410-b5e6-96231b3b80d8

tools/bugpoint/BugDriver.h

@@ -173,7 +173,8 @@ class BugDriver {
 
   /// executeProgram - This method runs "Program", capturing the output of the
   /// program to a file, returning the filename of the file.  A recommended
-  /// filename may be optionally specified.
+  /// filename may be optionally specified.  If there is a problem with the code
+  /// generator (e.g., llc crashes), this will throw an exception.
   ///
   std::string executeProgram(std::string RequestedOutputFilename = "",
                              std::string Bytecode = "",
@@ -182,13 +183,15 @@ class BugDriver {
                              bool *ProgramExitedNonzero = 0);
 
   /// executeProgramWithCBE - Used to create reference output with the C
-  /// backend, if reference output is not provided.
+  /// backend, if reference output is not provided.  If there is a problem with
+  /// the code generator (e.g., llc crashes), this will throw an exception.
   ///
   std::string executeProgramWithCBE(std::string OutputFile = "");
 
   /// diffProgram - This method executes the specified module and diffs the
   /// output against the file specified by ReferenceOutputFile.  If the output
-  /// is different, true is returned.
+  /// is different, true is returned.  If there is a problem with the code
+  /// generator (e.g., llc crashes), this will throw an exception.
   ///
   bool diffProgram(const std::string &BytecodeFile = "",
                    const std::string &SharedObj = "",

tools/bugpoint/ExecutionDriver.cpp

@@ -84,11 +84,12 @@ bool BugDriver::initializeExecutionEnvironment() {
 
   // Create an instance of the AbstractInterpreter interface as specified on
   // the command line
+  cbe = 0;
   std::string Message;
   switch (InterpreterSel) {
   case AutoPick:
     InterpreterSel = RunCBE;
-    Interpreter = AbstractInterpreter::createCBE(getToolName(), Message);
+    Interpreter = cbe = AbstractInterpreter::createCBE(getToolName(), Message);
     if (!Interpreter) {
       InterpreterSel = RunJIT;
       Interpreter = AbstractInterpreter::createJIT(getToolName(), Message);
@@ -116,7 +117,7 @@ bool BugDriver::initializeExecutionEnvironment() {
     Interpreter = AbstractInterpreter::createJIT(getToolName(), Message);
     break;
   case RunCBE:
-    Interpreter = AbstractInterpreter::createCBE(getToolName(), Message);
+    Interpreter = cbe = AbstractInterpreter::createCBE(getToolName(), Message);
     break;
   default:
     Message = "Sorry, this back-end is not supported by bugpoint right now!\n";
@@ -125,8 +126,10 @@ bool BugDriver::initializeExecutionEnvironment() {
   std::cerr << Message;
 
   // Initialize auxiliary tools for debugging
-  cbe = AbstractInterpreter::createCBE(getToolName(), Message);
-  if (!cbe) { std::cout << Message << "\nExiting.\n"; exit(1); }
+  if (!cbe) {
+    cbe = AbstractInterpreter::createCBE(getToolName(), Message);
+    if (!cbe) { std::cout << Message << "\nExiting.\n"; exit(1); }
+  }
   gcc = GCC::create(getToolName(), Message);
   if (!gcc) { std::cout << Message << "\nExiting.\n"; exit(1); }