For PR351:

* Place a try/catch block around the entire tool to Make sure std::string
  exceptions are caught and printed before exiting the tool.
* Make sure we catch unhandled exceptions at the top level so that we don't
  abort with a useless message but indicate than an unhandled exception was
  generated.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19192 91177308-0d34-0410-b5e6-96231b3b80d8

17 files changed, 948 insertions, 840 deletions

diff --git a/tools/analyze/analyze.cpp b/tools/analyze/analyze.cpp
index 5a0c950..0ac7068 100644
--- a/tools/analyze/analyze.cpp
+++ b/tools/analyze/analyze.cpp
@@ -116,58 +116,66 @@ namespace {
 }
 
 int main(int argc, char **argv) {
-  cl::ParseCommandLineOptions(argc, argv, " llvm analysis printer tool\n");
-  sys::PrintStackTraceOnErrorSignal();
-
-  Module *CurMod = 0;
   try {
+    cl::ParseCommandLineOptions(argc, argv, " llvm analysis printer tool\n");
+    sys::PrintStackTraceOnErrorSignal();
+
+    Module *CurMod = 0;
+    try {
 #if 0
-    TimeRegion RegionTimer(BytecodeLoadTimer);
+      TimeRegion RegionTimer(BytecodeLoadTimer);
 #endif
-    CurMod = ParseBytecodeFile(InputFilename);
-    if (!CurMod && !(CurMod = ParseAssemblyFile(InputFilename))){
-      std::cerr << argv[0] << ": input file didn't read correctly.\n";
+      CurMod = ParseBytecodeFile(InputFilename);
+      if (!CurMod && !(CurMod = ParseAssemblyFile(InputFilename))){
+        std::cerr << argv[0] << ": input file didn't read correctly.\n";
+        return 1;
+      }
+    } catch (const ParseException &E) {
+      std::cerr << argv[0] << ": " << E.getMessage() << "\n";
       return 1;
     }
-  } catch (const ParseException &E) {
-    std::cerr << argv[0] << ": " << E.getMessage() << "\n";
-    return 1;
-  }
 
-  // Create a PassManager to hold and optimize the collection of passes we are
-  // about to build...
-  //
-  PassManager Passes;
+    // Create a PassManager to hold and optimize the collection of passes we are
+    // about to build...
+    //
+    PassManager Passes;
+
+    // Add an appropriate TargetData instance for this module...
+    Passes.add(new TargetData("analyze", CurMod));
+
+    // Make sure the input LLVM is well formed.
+    if (!NoVerify)
+      Passes.add(createVerifierPass());
+
+    // Create a new optimization pass for each one specified on the command line
+    for (unsigned i = 0; i < AnalysesList.size(); ++i) {
+      const PassInfo *Analysis = AnalysesList[i];
+      
+      if (Analysis->getNormalCtor()) {
+        Pass *P = Analysis->getNormalCtor()();
+        Passes.add(P);
+
+        if (BasicBlockPass *BBP = dynamic_cast<BasicBlockPass*>(P))
+          Passes.add(new BasicBlockPassPrinter(Analysis));
+        else if (FunctionPass *FP = dynamic_cast<FunctionPass*>(P))
+          Passes.add(new FunctionPassPrinter(Analysis));
+        else
+          Passes.add(new ModulePassPrinter(Analysis));
+
+      } else
+        std::cerr << argv[0] << ": cannot create pass: "
+                  << Analysis->getPassName() << "\n";
+    }
 
-  // Add an appropriate TargetData instance for this module...
-  Passes.add(new TargetData("analyze", CurMod));
+    Passes.run(*CurMod);
 
-  // Make sure the input LLVM is well formed.
-  if (!NoVerify)
-    Passes.add(createVerifierPass());
+    delete CurMod;
+    return 0;
 
-  // Create a new optimization pass for each one specified on the command line
-  for (unsigned i = 0; i < AnalysesList.size(); ++i) {
-    const PassInfo *Analysis = AnalysesList[i];
-    
-    if (Analysis->getNormalCtor()) {
-      Pass *P = Analysis->getNormalCtor()();
-      Passes.add(P);
-
-      if (BasicBlockPass *BBP = dynamic_cast<BasicBlockPass*>(P))
-        Passes.add(new BasicBlockPassPrinter(Analysis));
-      else if (FunctionPass *FP = dynamic_cast<FunctionPass*>(P))
-        Passes.add(new FunctionPassPrinter(Analysis));
-      else
-        Passes.add(new ModulePassPrinter(Analysis));
-
-    } else
-      std::cerr << argv[0] << ": cannot create pass: "
-                << Analysis->getPassName() << "\n";
+  } catch (const std::string& msg) {
+    std::cerr << argv[0] << ": " << msg << "\n";
+  } catch (...) {
+    std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
   }
-
-  Passes.run(*CurMod);
-
-  delete CurMod;
-  return 0;
+  return 1;
 }
diff --git a/tools/bugpoint/bugpoint.cpp b/tools/bugpoint/bugpoint.cpp
index ff26a37..9e5b4c4 100644
--- a/tools/bugpoint/bugpoint.cpp
+++ b/tools/bugpoint/bugpoint.cpp
@@ -51,10 +51,11 @@ int main(int argc, char **argv) {
     return D.run();
   } catch (ToolExecutionError &TEE) {
     std::cerr << "Tool execution error: " << TEE.what() << '\n';
-    return 1;
+  } catch (const std::string& msg) {
+    std::cerr << argv[0] << ": " << msg << "\n";
   } catch (...) {
     std::cerr << "Whoops, an exception leaked out of bugpoint.  "
               << "This is a bug in bugpoint!\n";
-    return 1;
   }
+  return 1;
 }
diff --git a/tools/extract/extract.cpp b/tools/extract/extract.cpp
index 95822d0..c7f942a 100644
--- a/tools/extract/extract.cpp
+++ b/tools/extract/extract.cpp
@@ -45,53 +45,60 @@ ExtractFunc("func", cl::desc("Specify function to extract"), cl::init("main"),
             cl::value_desc("function"));
 
 int main(int argc, char **argv) {
-  cl::ParseCommandLineOptions(argc, argv, " llvm extractor\n");
-  sys::PrintStackTraceOnErrorSignal();
+  try {
+    cl::ParseCommandLineOptions(argc, argv, " llvm extractor\n");
+    sys::PrintStackTraceOnErrorSignal();
 
-  std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
-  if (M.get() == 0) {
-    std::cerr << argv[0] << ": bytecode didn't read correctly.\n";
-    return 1;
-  }
+    std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
+    if (M.get() == 0) {
+      std::cerr << argv[0] << ": bytecode didn't read correctly.\n";
+      return 1;
+    }
 
-  // Figure out which function we should extract
-  Function *F = M.get()->getNamedFunction(ExtractFunc);
-  if (F == 0) {
-    std::cerr << argv[0] << ": program doesn't contain function named '"
-              << ExtractFunc << "'!\n";
-    return 1;
-  }
+    // Figure out which function we should extract
+    Function *F = M.get()->getNamedFunction(ExtractFunc);
+    if (F == 0) {
+      std::cerr << argv[0] << ": program doesn't contain function named '"
+                << ExtractFunc << "'!\n";
+      return 1;
+    }
 
-  // In addition to deleting all other functions, we also want to spiff it up a
-  // little bit.  Do this now.
-  //
-  PassManager Passes;
-  Passes.add(new TargetData("extract", M.get())); // Use correct TargetData
-  // Either isolate the function or delete it from the Module
-  Passes.add(createFunctionExtractionPass(F, DeleteFn));
-  Passes.add(createGlobalDCEPass());              // Delete unreachable globals
-  Passes.add(createFunctionResolvingPass());      // Delete prototypes
-  Passes.add(createDeadTypeEliminationPass());    // Remove dead types...
+    // In addition to deleting all other functions, we also want to spiff it up a
+    // little bit.  Do this now.
+    //
+    PassManager Passes;
+    Passes.add(new TargetData("extract", M.get())); // Use correct TargetData
+    // Either isolate the function or delete it from the Module
+    Passes.add(createFunctionExtractionPass(F, DeleteFn));
+    Passes.add(createGlobalDCEPass());              // Delete unreachable globals
+    Passes.add(createFunctionResolvingPass());      // Delete prototypes
+    Passes.add(createDeadTypeEliminationPass());    // Remove dead types...
 
-  std::ostream *Out = 0;
+    std::ostream *Out = 0;
 
-  if (OutputFilename != "-") {  // Not stdout?
-    if (!Force && std::ifstream(OutputFilename.c_str())) {
-      // If force is not specified, make sure not to overwrite a file!
-      std::cerr << argv[0] << ": error opening '" << OutputFilename
-                << "': file exists!\n"
-                << "Use -f command line argument to force output\n";
-      return 1;
+    if (OutputFilename != "-") {  // Not stdout?
+      if (!Force && std::ifstream(OutputFilename.c_str())) {
+        // If force is not specified, make sure not to overwrite a file!
+        std::cerr << argv[0] << ": error opening '" << OutputFilename
+                  << "': file exists!\n"
+                  << "Use -f command line argument to force output\n";
+        return 1;
+      }
+      Out = new std::ofstream(OutputFilename.c_str());
+    } else {                      // Specified stdout
+      Out = &std::cout;       
     }
-    Out = new std::ofstream(OutputFilename.c_str());
-  } else {                      // Specified stdout
-    Out = &std::cout;       
-  }
 
-  Passes.add(new WriteBytecodePass(Out));  // Write bytecode to file...
-  Passes.run(*M.get());
+    Passes.add(new WriteBytecodePass(Out));  // Write bytecode to file...
+    Passes.run(*M.get());
 
-  if (Out != &std::cout)
-    delete Out;
-  return 0;
+    if (Out != &std::cout)
+      delete Out;
+    return 0;
+  } catch (const std::string& msg) {
+    std::cerr << argv[0] << ": " << msg << "\n";
+  } catch (...) {
+    std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
+  }
+  return 1;
 }
diff --git a/tools/gccas/gccas.cpp b/tools/gccas/gccas.cpp
index 813042c..c222c6e 100644
--- a/tools/gccas/gccas.cpp
+++ b/tools/gccas/gccas.cpp
@@ -128,77 +128,85 @@ void AddConfiguredTransformationPasses(PassManager &PM) {
 
 
 int main(int argc, char **argv) {
-  cl::ParseCommandLineOptions(argc, argv, " llvm .s -> .o assembler for GCC\n");
-  sys::PrintStackTraceOnErrorSignal();
-
-  std::auto_ptr<Module> M;
   try {
-    // Parse the file now...
-    M.reset(ParseAssemblyFile(InputFilename));
-  } catch (const ParseException &E) {
-    std::cerr << argv[0] << ": " << E.getMessage() << "\n";
-    return 1;
-  }
+    cl::ParseCommandLineOptions(argc, argv, 
+                                " llvm .s -> .o assembler for GCC\n");
+    sys::PrintStackTraceOnErrorSignal();
+
+    std::auto_ptr<Module> M;
+    try {
+      // Parse the file now...
+      M.reset(ParseAssemblyFile(InputFilename));
+    } catch (const ParseException &E) {
+      std::cerr << argv[0] << ": " << E.getMessage() << "\n";
+      return 1;
+    }
 
-  if (M.get() == 0) {
-    std::cerr << argv[0] << ": assembly didn't read correctly.\n";
-    return 1;
-  }
+    if (M.get() == 0) {
+      std::cerr << argv[0] << ": assembly didn't read correctly.\n";
+      return 1;
+    }
 
-  std::ostream *Out = 0;
-  if (OutputFilename == "") {   // Didn't specify an output filename?
-    if (InputFilename == "-") {
-      OutputFilename = "-";
-    } else {
-      std::string IFN = InputFilename;
-      int Len = IFN.length();
-      if (IFN[Len-2] == '.' && IFN[Len-1] == 's') {   // Source ends in .s?
-        OutputFilename = std::string(IFN.begin(), IFN.end()-2);
+    std::ostream *Out = 0;
+    if (OutputFilename == "") {   // Didn't specify an output filename?
+      if (InputFilename == "-") {
+        OutputFilename = "-";
       } else {
-        OutputFilename = IFN;   // Append a .o to it
+        std::string IFN = InputFilename;
+        int Len = IFN.length();
+        if (IFN[Len-2] == '.' && IFN[Len-1] == 's') {   // Source ends in .s?
+          OutputFilename = std::string(IFN.begin(), IFN.end()-2);
+        } else {
+          OutputFilename = IFN;   // Append a .o to it
+        }
+        OutputFilename += ".o";
       }
-      OutputFilename += ".o";
     }
-  }
 
-  if (OutputFilename == "-")
-    Out = &std::cout;
-  else {
-    Out = new std::ofstream(OutputFilename.c_str(), std::ios::out);
+    if (OutputFilename == "-")
+      Out = &std::cout;
+    else {
+      Out = new std::ofstream(OutputFilename.c_str(), std::ios::out);
 
-    // Make sure that the Out file gets unlinked from the disk if we get a
-    // signal
-    sys::RemoveFileOnSignal(sys::Path(OutputFilename));
-  }
+      // Make sure that the Out file gets unlinked from the disk if we get a
+      // signal
+      sys::RemoveFileOnSignal(sys::Path(OutputFilename));
+    }
 
-  
-  if (!Out->good()) {
-    std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
-    return 1;
-  }
+    
+    if (!Out->good()) {
+      std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
+      return 1;
+    }
 
-  // In addition to just parsing the input from GCC, we also want to spiff it up
-  // a little bit.  Do this now.
-  //
-  PassManager Passes;
+    // In addition to just parsing the input from GCC, we also want to spiff it up
+    // a little bit.  Do this now.
+    //
+    PassManager Passes;
 
-  // Add an appropriate TargetData instance for this module...
-  Passes.add(new TargetData("gccas", M.get()));
+    // Add an appropriate TargetData instance for this module...
+    Passes.add(new TargetData("gccas", M.get()));
 
-  // Add all of the transformation passes to the pass manager to do the cleanup
-  // and optimization of the GCC output.
-  //
-  AddConfiguredTransformationPasses(Passes);
+    // Add all of the transformation passes to the pass manager to do the cleanup
+    // and optimization of the GCC output.
+    //
+    AddConfiguredTransformationPasses(Passes);
 
-  // Make sure everything is still good.
-  Passes.add(createVerifierPass());
+    // Make sure everything is still good.
+    Passes.add(createVerifierPass());
 
-  // Write bytecode to file...
-  Passes.add(new WriteBytecodePass(Out,false,!NoCompress));
+    // Write bytecode to file...
+    Passes.add(new WriteBytecodePass(Out,false,!NoCompress));
 
-  // Run our queue of passes all at once now, efficiently.
-  Passes.run(*M.get());
+    // Run our queue of passes all at once now, efficiently.
+    Passes.run(*M.get());
 
-  if (Out != &std::cout) delete Out;
-  return 0;
+    if (Out != &std::cout) delete Out;
+    return 0;
+  } catch (const std::string& msg) {
+    std::cerr << argv[0] << ": " << msg << "\n";
+  } catch (...) {
+    std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
+  }
+  return 1;
 }
diff --git a/tools/llc/llc.cpp b/tools/llc/llc.cpp
index ba624b2..cbb2507 100644
--- a/tools/llc/llc.cpp
+++ b/tools/llc/llc.cpp
@@ -63,110 +63,117 @@ GetFileNameRoot(const std::string &InputFilename) {
 // main - Entry point for the llc compiler.
 //
 int main(int argc, char **argv) {
-  cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n");
-  sys::PrintStackTraceOnErrorSignal();
-
-  // Load the module to be compiled...
-  std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
-  if (M.get() == 0) {
-    std::cerr << argv[0] << ": bytecode didn't read correctly.\n";
-    return 1;
-  }
-  Module &mod = *M.get();
-
-  // Allocate target machine.  First, check whether the user has
-  // explicitly specified an architecture to compile for.
-  TargetMachine* (*TargetMachineAllocator)(const Module&,
-                                           IntrinsicLowering *) = 0;
-  if (MArch == 0) {
-    std::string Err;
-    MArch = TargetMachineRegistry::getClosestStaticTargetForModule(mod, Err);
-    if (MArch == 0) {
-      std::cerr << argv[0] << ": error auto-selecting target for module '"
-                << Err << "'.  Please use the -march option to explicitly "
-                << "pick a target.\n";
+  try {
+    cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n");
+    sys::PrintStackTraceOnErrorSignal();
+
+    // Load the module to be compiled...
+    std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
+    if (M.get() == 0) {
+      std::cerr << argv[0] << ": bytecode didn't read correctly.\n";
       return 1;
     }
-  }
+    Module &mod = *M.get();
 
-  std::auto_ptr<TargetMachine> target(MArch->CtorFn(mod, 0));
-  assert(target.get() && "Could not allocate target machine!");
-  TargetMachine &Target = *target.get();
-  const TargetData &TD = Target.getTargetData();
-
-  // Build up all of the passes that we want to do to the module...
-  PassManager Passes;
-  Passes.add(new TargetData("llc", TD.isLittleEndian(), TD.getPointerSize(),
-                            TD.getPointerAlignment(), TD.getDoubleAlignment()));
-
-  // Figure out where we are going to send the output...
-  std::ostream *Out = 0;
-  if (OutputFilename != "") {
-    if (OutputFilename != "-") {
-      // Specified an output filename?
-      if (!Force && std::ifstream(OutputFilename.c_str())) {
-        // If force is not specified, make sure not to overwrite a file!
-        std::cerr << argv[0] << ": error opening '" << OutputFilename
-                  << "': file exists!\n"
-                  << "Use -f command line argument to force output\n";
+    // Allocate target machine.  First, check whether the user has
+    // explicitly specified an architecture to compile for.
+    TargetMachine* (*TargetMachineAllocator)(const Module&,
+                                             IntrinsicLowering *) = 0;
+    if (MArch == 0) {
+      std::string Err;
+      MArch = TargetMachineRegistry::getClosestStaticTargetForModule(mod, Err);
+      if (MArch == 0) {
+        std::cerr << argv[0] << ": error auto-selecting target for module '"
+                  << Err << "'.  Please use the -march option to explicitly "
+                  << "pick a target.\n";
         return 1;
       }
-      Out = new std::ofstream(OutputFilename.c_str());
+    }
 
-      // Make sure that the Out file gets unlinked from the disk if we get a
-      // SIGINT
-      sys::RemoveFileOnSignal(sys::Path(OutputFilename));
+    std::auto_ptr<TargetMachine> target(MArch->CtorFn(mod, 0));
+    assert(target.get() && "Could not allocate target machine!");
+    TargetMachine &Target = *target.get();
+    const TargetData &TD = Target.getTargetData();
+
+    // Build up all of the passes that we want to do to the module...
+    PassManager Passes;
+    Passes.add(new TargetData("llc", TD.isLittleEndian(), TD.getPointerSize(),
+                              TD.getPointerAlignment(), TD.getDoubleAlignment()));
+
+    // Figure out where we are going to send the output...
+    std::ostream *Out = 0;
+    if (OutputFilename != "") {
+      if (OutputFilename != "-") {
+        // Specified an output filename?
+        if (!Force && std::ifstream(OutputFilename.c_str())) {
+          // If force is not specified, make sure not to overwrite a file!
+          std::cerr << argv[0] << ": error opening '" << OutputFilename
+                    << "': file exists!\n"
+                    << "Use -f command line argument to force output\n";
+          return 1;
+        }
+        Out = new std::ofstream(OutputFilename.c_str());
+
+        // Make sure that the Out file gets unlinked from the disk if we get a
+        // SIGINT
+        sys::RemoveFileOnSignal(sys::Path(OutputFilename));
+      } else {
+        Out = &std::cout;
+      }
     } else {
-      Out = &std::cout;
+      if (InputFilename == "-") {
+        OutputFilename = "-";
+        Out = &std::cout;
+      } else {
+        OutputFilename = GetFileNameRoot(InputFilename); 
+
+        if (MArch->Name[0] != 'c' || MArch->Name[1] != 0)  // not CBE
+          OutputFilename += ".s";
+        else
+          OutputFilename += ".cbe.c";
+        
+        if (!Force && std::ifstream(OutputFilename.c_str())) {
+          // If force is not specified, make sure not to overwrite a file!
+          std::cerr << argv[0] << ": error opening '" << OutputFilename
+                    << "': file exists!\n"
+                    << "Use -f command line argument to force output\n";
+          return 1;
+        }
+        
+        Out = new std::ofstream(OutputFilename.c_str());
+        if (!Out->good()) {
+          std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
+          delete Out;
+          return 1;
+        }
+        
+        // Make sure that the Out file gets unlinked from the disk if we get a
+        // SIGINT
+        sys::RemoveFileOnSignal(sys::Path(OutputFilename));
+      }
     }
-  } else {
-    if (InputFilename == "-") {
-      OutputFilename = "-";
-      Out = &std::cout;
+
+    // Ask the target to add backend passes as necessary
+    if (Target.addPassesToEmitAssembly(Passes, *Out)) {
+      std::cerr << argv[0] << ": target '" << Target.getName()
+                << "' does not support static compilation!\n";
+      if (Out != &std::cout) delete Out;
+      // And the Out file is empty and useless, so remove it now.
+      std::remove(OutputFilename.c_str());
+      return 1;
     } else {
-      OutputFilename = GetFileNameRoot(InputFilename); 
-
-      if (MArch->Name[0] != 'c' || MArch->Name[1] != 0)  // not CBE
-        OutputFilename += ".s";
-      else
-        OutputFilename += ".cbe.c";
-      
-      if (!Force && std::ifstream(OutputFilename.c_str())) {
-        // If force is not specified, make sure not to overwrite a file!
-        std::cerr << argv[0] << ": error opening '" << OutputFilename
-                  << "': file exists!\n"
-                  << "Use -f command line argument to force output\n";
-        return 1;
-      }
-      
-      Out = new std::ofstream(OutputFilename.c_str());
-      if (!Out->good()) {
-        std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
-        delete Out;
-        return 1;
-      }
-      
-      // Make sure that the Out file gets unlinked from the disk if we get a
-      // SIGINT
-      sys::RemoveFileOnSignal(sys::Path(OutputFilename));
+      // Run our queue of passes all at once now, efficiently.
+      Passes.run(*M.get());
     }
-  }
 
-  // Ask the target to add backend passes as necessary
-  if (Target.addPassesToEmitAssembly(Passes, *Out)) {
-    std::cerr << argv[0] << ": target '" << Target.getName()
-              << "' does not support static compilation!\n";
+    // Delete the ostream if it's not a stdout stream
     if (Out != &std::cout) delete Out;
-    // And the Out file is empty and useless, so remove it now.
-    std::remove(OutputFilename.c_str());
-    return 1;
-  } else {
-    // Run our queue of passes all at once now, efficiently.
-    Passes.run(*M.get());
-  }
 
-  // Delete the ostream if it's not a stdout stream
-  if (Out != &std::cout) delete Out;
-
-  return 0;
+    return 0;
+  } catch (const std::string& msg) {
+    std::cerr << argv[0] << ": " << msg << "\n";
+  } catch (...) {
+    std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
+  }
+  return 1;
 }
diff --git a/tools/lli/lli.cpp b/tools/lli/lli.cpp
index eb8ac01..6d16ea5 100644
--- a/tools/lli/lli.cpp
+++ b/tools/lli/lli.cpp
@@ -47,62 +47,69 @@ namespace {
 // main Driver function
 //
 int main(int argc, char **argv, char * const *envp) {
-  cl::ParseCommandLineOptions(argc, argv,
-                              " llvm interpreter & dynamic compiler\n");
-  sys::PrintStackTraceOnErrorSignal();
-
-  // Load the bytecode...
-  std::string ErrorMsg;
-  ModuleProvider *MP = 0;
   try {
-    MP = getBytecodeModuleProvider(InputFile);
-  } catch (std::string &err) {
-    std::cerr << "Error loading program '" << InputFile << "': " << err << "\n";
-    exit(1);
-  }
-
-  ExecutionEngine *EE = ExecutionEngine::create(MP, ForceInterpreter);
-  assert(EE && "Couldn't create an ExecutionEngine, not even an interpreter?");
-
-  // If the user specifically requested an argv[0] to pass into the program, do
-  // it now.
-  if (!FakeArgv0.empty()) {
-    InputFile = FakeArgv0;
-  } else {
-    // Otherwise, if there is a .bc suffix on the executable strip it off, it
-    // might confuse the program.
-    if (InputFile.rfind(".bc") == InputFile.length() - 3)
-      InputFile.erase(InputFile.length() - 3);
-  }
-
-  // Add the module's name to the start of the vector of arguments to main().
-  InputArgv.insert(InputArgv.begin(), InputFile);
-
-  // Call the main function from M as if its signature were:
-  //   int main (int argc, char **argv, const char **envp)
-  // using the contents of Args to determine argc & argv, and the contents of
-  // EnvVars to determine envp.
-  //
-  Function *Fn = MP->getModule()->getMainFunction();
-  if (!Fn) {
-    std::cerr << "'main' function not found in module.\n";
-    return -1;
+    cl::ParseCommandLineOptions(argc, argv,
+                                " llvm interpreter & dynamic compiler\n");
+    sys::PrintStackTraceOnErrorSignal();
+
+    // Load the bytecode...
+    std::string ErrorMsg;
+    ModuleProvider *MP = 0;
+    try {
+      MP = getBytecodeModuleProvider(InputFile);
+    } catch (std::string &err) {
+      std::cerr << "Error loading program '" << InputFile << "': " << err << "\n";
+      exit(1);
+    }
+
+    ExecutionEngine *EE = ExecutionEngine::create(MP, ForceInterpreter);
+    assert(EE && "Couldn't create an ExecutionEngine, not even an interpreter?");
+
+    // If the user specifically requested an argv[0] to pass into the program, do
+    // it now.
+    if (!FakeArgv0.empty()) {
+      InputFile = FakeArgv0;
+    } else {
+      // Otherwise, if there is a .bc suffix on the executable strip it off, it
+      // might confuse the program.
+      if (InputFile.rfind(".bc") == InputFile.length() - 3)
+        InputFile.erase(InputFile.length() - 3);
+    }
+
+    // Add the module's name to the start of the vector of arguments to main().
+    InputArgv.insert(InputArgv.begin(), InputFile);
+
+    // Call the main function from M as if its signature were:
+    //   int main (int argc, char **argv, const char **envp)
+    // using the contents of Args to determine argc & argv, and the contents of
+    // EnvVars to determine envp.
+    //
+    Function *Fn = MP->getModule()->getMainFunction();
+    if (!Fn) {
+      std::cerr << "'main' function not found in module.\n";
+      return -1;
+    }
+
+    // Run main...
+    int Result = EE->runFunctionAsMain(Fn, InputArgv, envp);
+
+    // If the program didn't explicitly call exit, call exit now, for the program.
+    // This ensures that any atexit handlers get called correctly.
+    Function *Exit = MP->getModule()->getOrInsertFunction("exit", Type::VoidTy,
+                                                          Type::IntTy, 0);
+
+    std::vector<GenericValue> Args;
+    GenericValue ResultGV;
+    ResultGV.IntVal = Result;
+    Args.push_back(ResultGV);
+    EE->runFunction(Exit, Args);
+
+    std::cerr << "ERROR: exit(" << Result << ") returned!\n";
+    abort();
+  } catch (const std::string& msg) {
+    std::cerr << argv[0] << ": " << msg << "\n";
+  } catch (...) {
+    std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
   }
-
-  // Run main...
-  int Result = EE->runFunctionAsMain(Fn, InputArgv, envp);
-
-  // If the program didn't explicitly call exit, call exit now, for the program.
-  // This ensures that any atexit handlers get called correctly.
-  Function *Exit = MP->getModule()->getOrInsertFunction("exit", Type::VoidTy,
-                                                        Type::IntTy, 0);
-
-  std::vector<GenericValue> Args;
-  GenericValue ResultGV;
-  ResultGV.IntVal = Result;
-  Args.push_back(ResultGV);
-  EE->runFunction(Exit, Args);
-
-  std::cerr << "ERROR: exit(" << Result << ") returned!\n";
   abort();
 }
diff --git a/tools/llvm-as/llvm-as.cpp b/tools/llvm-as/llvm-as.cpp
index 7a777a4..804490a 100644
--- a/tools/llvm-as/llvm-as.cpp
+++ b/tools/llvm-as/llvm-as.cpp
@@ -52,6 +52,7 @@ int main(int argc, char **argv) {
   cl::ParseCommandLineOptions(argc, argv, " llvm .ll -> .bc assembler\n");
   sys::PrintStackTraceOnErrorSignal();
 
+  int exitCode = 0;
   std::ostream *Out = 0;
   try {
     // Parse the file now...
@@ -126,10 +127,16 @@ int main(int argc, char **argv) {
     WriteBytecodeToFile(M.get(), *Out, !NoCompress);
   } catch (const ParseException &E) {
     std::cerr << argv[0] << ": " << E.getMessage() << "\n";
-    return 1;
+    exitCode = 1;
+  } catch (const std::string& msg) {
+    std::cerr << argv[0] << ": " << msg << "\n";
+    exitCode = 1;
+  } catch (...) {
+    std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
+    exitCode = 1;
   }
 
   if (Out != &std::cout) delete Out;
-  return 0;
+  return exitCode;
 }
 
diff --git a/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp b/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp
index d4be138..b79b6fe 100644
--- a/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp
+++ b/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp
@@ -49,52 +49,58 @@ static cl::opt<bool> Dump      ("dump", cl::desc("Dump low level bytecode trace"
 static cl::opt<bool> Verify    ("verify", cl::desc("Progressively verify module"));
 
 int 
-main(int argc, char **argv) 
-{
-  cl::ParseCommandLineOptions(argc, argv, 
-    " llvm-bcanalyzer Analysis of ByteCode Dumper\n");
-
-  sys::PrintStackTraceOnErrorSignal();
-
-  std::ostream* Out = &std::cout;  // Default to printing to stdout...
-  std::istream* In  = &std::cin;   // Default to reading stdin
-  std::string ErrorMessage;
-  BytecodeAnalysis bca;
-
-  /// Determine what to generate
-  bca.detailedResults = !NoDetails;
-  bca.progressiveVerify = Verify;
-
-  /// Analyze the bytecode file
-  Module* M = AnalyzeBytecodeFile(InputFilename, bca, &ErrorMessage, (Dump?Out:0));
-
-  // All that bcanalyzer does is write the gathered statistics to the output
-  PrintBytecodeAnalysis(bca,*Out);
-
-  if ( M && Verify ) {
-    std::string verificationMsg;
-    try {
-      verifyModule( *M, ThrowExceptionAction );
-    } catch (std::string& errmsg ) {
-      verificationMsg = errmsg;
+main(int argc, char **argv) {
+  try {
+    cl::ParseCommandLineOptions(argc, argv, 
+      " llvm-bcanalyzer Analysis of ByteCode Dumper\n");
+
+    sys::PrintStackTraceOnErrorSignal();
+
+    std::ostream* Out = &std::cout;  // Default to printing to stdout...
+    std::istream* In  = &std::cin;   // Default to reading stdin
+    std::string ErrorMessage;
+    BytecodeAnalysis bca;
+
+    /// Determine what to generate
+    bca.detailedResults = !NoDetails;
+    bca.progressiveVerify = Verify;
+
+    /// Analyze the bytecode file
+    Module* M = AnalyzeBytecodeFile(InputFilename, bca, &ErrorMessage, (Dump?Out:0));
+
+    // All that bcanalyzer does is write the gathered statistics to the output
+    PrintBytecodeAnalysis(bca,*Out);
+
+    if ( M && Verify ) {
+      std::string verificationMsg;
+      try {
+        verifyModule( *M, ThrowExceptionAction );
+      } catch (std::string& errmsg ) {
+        verificationMsg = errmsg;
+      }
+      if ( verificationMsg.length() > 0 ) 
+        std::cerr << "Final Verification Message: " << verificationMsg << "\n";
     }
-    if ( verificationMsg.length() > 0 ) 
-      std::cerr << "Final Verification Message: " << verificationMsg << "\n";
-  }
 
 
-  // If there was an error, print it and stop.
-  if ( ErrorMessage.size() ) {
-    std::cerr << argv[0] << ": " << ErrorMessage << "\n";
-    return 1;
-  }
-  
+    // If there was an error, print it and stop.
+    if ( ErrorMessage.size() ) {
+      std::cerr << argv[0] << ": " << ErrorMessage << "\n";
+      return 1;
+    }
+    
 
-  if (Out != &std::cout) {
-    ((std::ofstream*)Out)->close();
-    delete Out;
+    if (Out != &std::cout) {
+      ((std::ofstream*)Out)->close();
+      delete Out;
+    }
+    return 0;
+  } catch (const std::string& msg) {
+    std::cerr << argv[0] << ": " << msg << "\n";
+  } catch (...) {
+    std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
   }
-  return 0;
+  return 1;
 }
 
 // vim: sw=2
diff --git a/tools/llvm-db/llvm-db.cpp b/tools/llvm-db/llvm-db.cpp
index 2e8dc83..f7913df 100644
--- a/tools/llvm-db/llvm-db.cpp
+++ b/tools/llvm-db/llvm-db.cpp
@@ -50,39 +50,46 @@ namespace {
 // main Driver function
 //
 int main(int argc, char **argv, char * const *envp) {
-  cl::ParseCommandLineOptions(argc, argv,
-                              " llvm source-level debugger\n");
-  sys::PrintStackTraceOnErrorSignal();
+  try {
+    cl::ParseCommandLineOptions(argc, argv,
+                                " llvm source-level debugger\n");
+    sys::PrintStackTraceOnErrorSignal();
 
-  if (!Quiet)
-    std::cout << "llvm-db: The LLVM source-level debugger\n";
+    if (!Quiet)
+      std::cout << "llvm-db: The LLVM source-level debugger\n";
 
-  // Merge Inputfile and InputArgs into the InputArgs list...
-  if (!InputFile.empty() && InputArgs.empty())
-    InputArgs.push_back(InputFile);
+    // Merge Inputfile and InputArgs into the InputArgs list...
+    if (!InputFile.empty() && InputArgs.empty())
+      InputArgs.push_back(InputFile);
 
-  // Create the CLI debugger...
-  CLIDebugger D;
+    // Create the CLI debugger...
+    CLIDebugger D;
 
-  // Initialize the debugger with the command line options we read...
-  Debugger &Dbg = D.getDebugger();
+    // Initialize the debugger with the command line options we read...
+    Debugger &Dbg = D.getDebugger();
 
-  // Initialize the debugger environment.
-  Dbg.initializeEnvironment(envp);
-  Dbg.setWorkingDirectory(WorkingDirectory);
-  for (unsigned i = 0, e = SourceDirectories.size(); i != e; ++i)
-    D.addSourceDirectory(SourceDirectories[i]);
-  
-  if (!InputArgs.empty()) {
-    try {
-      D.fileCommand(InputArgs[0]);
-    } catch (const std::string &Error) {
-      std::cout << "Error: " << Error << "\n";
+    // Initialize the debugger environment.
+    Dbg.initializeEnvironment(envp);
+    Dbg.setWorkingDirectory(WorkingDirectory);
+    for (unsigned i = 0, e = SourceDirectories.size(); i != e; ++i)
+      D.addSourceDirectory(SourceDirectories[i]);
+    
+    if (!InputArgs.empty()) {
+      try {
+        D.fileCommand(InputArgs[0]);
+      } catch (const std::string &Error) {
+        std::cout << "Error: " << Error << "\n";
+      }
+
+      Dbg.setProgramArguments(InputArgs.begin()+1, InputArgs.end());
     }
 
-    Dbg.setProgramArguments(InputArgs.begin()+1, InputArgs.end());
+    // Now that we have initialized the debugger, run it.
+    return D.run();
+  } catch (const std::string& msg) {
+    std::cerr << argv[0] << ": " << msg << "\n";
+  } catch (...) {
+    std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
   }
-
-  // Now that we have initialized the debugger, run it.
-  return D.run();
+  return 1;
 }
diff --git a/tools/llvm-dis/llvm-dis.cpp b/tools/llvm-dis/llvm-dis.cpp
index 78d10ee..8fa16c8 100644
--- a/tools/llvm-dis/llvm-dis.cpp
+++ b/tools/llvm-dis/llvm-dis.cpp
@@ -41,81 +41,88 @@ static cl::opt<bool>
 CWriteMode("c", cl::desc("Obsolete option, do not use"), cl::ReallyHidden);
 
 int main(int argc, char **argv) {
-  cl::ParseCommandLineOptions(argc, argv, " llvm .bc -> .ll disassembler\n");
-  sys::PrintStackTraceOnErrorSignal();
+  try {
+    cl::ParseCommandLineOptions(argc, argv, " llvm .bc -> .ll disassembler\n");
+    sys::PrintStackTraceOnErrorSignal();
 
-  std::ostream *Out = &std::cout;  // Default to printing to stdout...
-  std::string ErrorMessage;
+    std::ostream *Out = &std::cout;  // Default to printing to stdout...
+    std::string ErrorMessage;
 
-  if (CWriteMode) {
-    std::cerr << "ERROR: llvm-dis no longer contains the C backend. "
-              << "Use 'llc -march=c' instead!\n";
-    exit(1);
-  }
+    if (CWriteMode) {
+      std::cerr << "ERROR: llvm-dis no longer contains the C backend. "
+                << "Use 'llc -march=c' instead!\n";
+      exit(1);
+    }
 
-  std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename, &ErrorMessage));
-  if (M.get() == 0) {
-    std::cerr << argv[0] << ": ";
-    if (ErrorMessage.size())
-      std::cerr << ErrorMessage << "\n";
-    else
-      std::cerr << "bytecode didn't read correctly.\n";
-    return 1;
-  }
-  
-  if (OutputFilename != "") {   // Specified an output filename?
-    if (OutputFilename != "-") { // Not stdout?
-      if (!Force && std::ifstream(OutputFilename.c_str())) {
-        // If force is not specified, make sure not to overwrite a file!
-        std::cerr << argv[0] << ": error opening '" << OutputFilename
-                  << "': file exists! Sending to standard output.\n";
-      } else {
-        Out = new std::ofstream(OutputFilename.c_str());
-      }
+    std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename, &ErrorMessage));
+    if (M.get() == 0) {
+      std::cerr << argv[0] << ": ";
+      if (ErrorMessage.size())
+        std::cerr << ErrorMessage << "\n";
+      else
+        std::cerr << "bytecode didn't read correctly.\n";
+      return 1;
     }
-  } else {
-    if (InputFilename == "-") {
-      OutputFilename = "-";
-    } else {
-      std::string IFN = InputFilename;
-      int Len = IFN.length();
-      if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
-	// Source ends in .bc
-	OutputFilename = std::string(IFN.begin(), IFN.end()-3)+".ll";
-      } else {
-	OutputFilename = IFN+".ll";
+    
+    if (OutputFilename != "") {   // Specified an output filename?
+      if (OutputFilename != "-") { // Not stdout?
+        if (!Force && std::ifstream(OutputFilename.c_str())) {
+          // If force is not specified, make sure not to overwrite a file!
+          std::cerr << argv[0] << ": error opening '" << OutputFilename
+                    << "': file exists! Sending to standard output.\n";
+        } else {
+          Out = new std::ofstream(OutputFilename.c_str());
+        }
       }
-
-      if (!Force && std::ifstream(OutputFilename.c_str())) {
-        // If force is not specified, make sure not to overwrite a file!
-        std::cerr << argv[0] << ": error opening '" << OutputFilename
-                  << "': file exists! Sending to standard output.\n";
+    } else {
+      if (InputFilename == "-") {
+        OutputFilename = "-";
       } else {
-        Out = new std::ofstream(OutputFilename.c_str());
-
-        // Make sure that the Out file gets unlinked from the disk if we get a
-        // SIGINT
-        sys::RemoveFileOnSignal(sys::Path(OutputFilename));
+        std::string IFN = InputFilename;
+        int Len = IFN.length();
+        if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
+          // Source ends in .bc
+          OutputFilename = std::string(IFN.begin(), IFN.end()-3)+".ll";
+        } else {
+          OutputFilename = IFN+".ll";
+        }
+
+        if (!Force && std::ifstream(OutputFilename.c_str())) {
+          // If force is not specified, make sure not to overwrite a file!
+          std::cerr << argv[0] << ": error opening '" << OutputFilename
+                    << "': file exists! Sending to standard output.\n";
+        } else {
+          Out = new std::ofstream(OutputFilename.c_str());
+
+          // Make sure that the Out file gets unlinked from the disk if we get a
+          // SIGINT
+          sys::RemoveFileOnSignal(sys::Path(OutputFilename));
+        }
       }
     }
-  }
 
-  if (!Out->good()) {
-    std::cerr << argv[0] << ": error opening " << OutputFilename
-              << ": sending to stdout instead!\n";
-    Out = &std::cout;
-  }
+    if (!Out->good()) {
+      std::cerr << argv[0] << ": error opening " << OutputFilename
+                << ": sending to stdout instead!\n";
+      Out = &std::cout;
+    }
 
-  // All that dis does is write the assembly or C out to a file...
-  //
-  PassManager Passes;
-  Passes.add(new PrintModulePass(Out));
-  Passes.run(*M.get());
+    // All that dis does is write the assembly or C out to a file...
+    //
+    PassManager Passes;
+    Passes.add(new PrintModulePass(Out));
+    Passes.run(*M.get());
 
-  if (Out != &std::cout) {
-    ((std::ofstream*)Out)->close();
-    delete Out;
+    if (Out != &std::cout) {
+      ((std::ofstream*)Out)->close();
+      delete Out;
+    }
+    return 0;
+  } catch (const std::string& msg) {
+    std::cerr << argv[0] << ": " << msg << "\n";
+  } catch (...) {
+    std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
   }
-  return 0;
+  return 1;
 }
 
diff --git a/tools/llvm-extract/llvm-extract.cpp b/tools/llvm-extract/llvm-extract.cpp
index 95822d0..c7f942a 100644
--- a/tools/llvm-extract/llvm-extract.cpp
+++ b/tools/llvm-extract/llvm-extract.cpp
@@ -45,53 +45,60 @@ ExtractFunc("func", cl::desc("Specify function to extract"), cl::init("main"),
             cl::value_desc("function"));
 
 int main(int argc, char **argv) {
-  cl::ParseCommandLineOptions(argc, argv, " llvm extractor\n");
-  sys::PrintStackTraceOnErrorSignal();
+  try {
+    cl::ParseCommandLineOptions(argc, argv, " llvm extractor\n");
+    sys::PrintStackTraceOnErrorSignal();
 
-  std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
-  if (M.get() == 0) {
-    std::cerr << argv[0] << ": bytecode didn't read correctly.\n";
-    return 1;
-  }
+    std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
+    if (M.get() == 0) {
+      std::cerr << argv[0] << ": bytecode didn't read correctly.\n";
+      return 1;
+    }
 
-  // Figure out which function we should extract
-  Function *F = M.get()->getNamedFunction(ExtractFunc);
-  if (F == 0) {
-    std::cerr << argv[0] << ": program doesn't contain function named '"
-              << ExtractFunc << "'!\n";
-    return 1;
-  }
+    // Figure out which function we should extract
+    Function *F = M.get()->getNamedFunction(ExtractFunc);
+    if (F == 0) {
+      std::cerr << argv[0] << ": program doesn't contain function named '"
+                << ExtractFunc << "'!\n";
+      return 1;
+    }
 
-  // In addition to deleting all other functions, we also want to spiff it up a
-  // little bit.  Do this now.
-  //
-  PassManager Passes;
-  Passes.add(new TargetData("extract", M.get())); // Use correct TargetData
-  // Either isolate the function or delete it from the Module
-  Passes.add(createFunctionExtractionPass(F, DeleteFn));
-  Passes.add(createGlobalDCEPass());              // Delete unreachable globals
-  Passes.add(createFunctionResolvingPass());      // Delete prototypes
-  Passes.add(createDeadTypeEliminationPass());    // Remove dead types...
+    // In addition to deleting all other functions, we also want to spiff it up a
+    // little bit.  Do this now.
+    //
+    PassManager Passes;
+    Passes.add(new TargetData("extract", M.get())); // Use correct TargetData
+    // Either isolate the function or delete it from the Module
+    Passes.add(createFunctionExtractionPass(F, DeleteFn));
+    Passes.add(createGlobalDCEPass());              // Delete unreachable globals
+    Passes.add(createFunctionResolvingPass());      // Delete prototypes
+    Passes.add(createDeadTypeEliminationPass());    // Remove dead types...
 
-  std::ostream *Out = 0;
+    std::ostream *Out = 0;
 
-  if (OutputFilename != "-") {  // Not stdout?
-    if (!Force && std::ifstream(OutputFilename.c_str())) {
-      // If force is not specified, make sure not to overwrite a file!
-      std::cerr << argv[0] << ": error opening '" << OutputFilename
-                << "': file exists!\n"
-                << "Use -f command line argument to force output\n";
-      return 1;
+    if (OutputFilename != "-") {  // Not stdout?
+      if (!Force && std::ifstream(OutputFilename.c_str())) {
+        // If force is not specified, make sure not to overwrite a file!
+        std::cerr << argv[0] << ": error opening '" << OutputFilename
+                  << "': file exists!\n"
+                  << "Use -f command line argument to force output\n";
+        return 1;
+      }
+      Out = new std::ofstream(OutputFilename.c_str());
+    } else {                      // Specified stdout
+      Out = &std::cout;       
     }
-    Out = new std::ofstream(OutputFilename.c_str());
-  } else {                      // Specified stdout
-    Out = &std::cout;       
-  }
 
-  Passes.add(new WriteBytecodePass(Out));  // Write bytecode to file...
-  Passes.run(*M.get());
+    Passes.add(new WriteBytecodePass(Out));  // Write bytecode to file...
+    Passes.run(*M.get());
 
-  if (Out != &std::cout)
-    delete Out;
-  return 0;
+    if (Out != &std::cout)
+      delete Out;
+    return 0;
+  } catch (const std::string& msg) {
+    std::cerr << argv[0] << ": " << msg << "\n";
+  } catch (...) {
+    std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
+  }
+  return 1;
 }
diff --git a/tools/llvm-ld/llvm-ld.cpp b/tools/llvm-ld/llvm-ld.cpp
index b944383..07879ac 100644
--- a/tools/llvm-ld/llvm-ld.cpp
+++ b/tools/llvm-ld/llvm-ld.cpp
@@ -389,126 +389,133 @@ extern void Optimize(Module*);
 }
 
 int main(int argc, char **argv, char **envp) {
-  // Initial global variable above for convenience printing of program name.
-  progname = sys::Path(argv[0]).getBasename();
-  Linker TheLinker(progname, Verbose);
-  
-  // Set up the library paths for the Linker
-  TheLinker.addPaths(LibPaths);
-  TheLinker.addSystemPaths();
-
-  // Parse the command line options
-  cl::ParseCommandLineOptions(argc, argv, " llvm linker\n");
-  sys::PrintStackTraceOnErrorSignal();
-
-  // Remove any consecutive duplicates of the same library...
-  Libraries.erase(std::unique(Libraries.begin(), Libraries.end()),
-                  Libraries.end());
-
-  if (LinkAsLibrary) {
-    std::vector<sys::Path> Files;
-    for (unsigned i = 0; i < InputFilenames.size(); ++i )
-      Files.push_back(sys::Path(InputFilenames[i]));
-    if (TheLinker.LinkInFiles(Files))
-      return 1; // Error already printed
-
-    // The libraries aren't linked in but are noted as "dependent" in the
-    // module.
-    for (cl::list<std::string>::const_iterator I = Libraries.begin(), 
-         E = Libraries.end(); I != E ; ++I) {
-      TheLinker.getModule()->addLibrary(*I);
-    }
-  } else {
-    // Build a list of the items from our command line
-    Linker::ItemList Items;
-    BuildLinkItems(Items, InputFilenames, Libraries);
-
-    // Link all the items together
-    if (TheLinker.LinkInItems(Items) )
-      return 1;
-  }
+  try {
+    // Initial global variable above for convenience printing of program name.
+    progname = sys::Path(argv[0]).getBasename();
+    Linker TheLinker(progname, Verbose);
+    
+    // Set up the library paths for the Linker
+    TheLinker.addPaths(LibPaths);
+    TheLinker.addSystemPaths();
+
+    // Parse the command line options
+    cl::ParseCommandLineOptions(argc, argv, " llvm linker\n");
+    sys::PrintStackTraceOnErrorSignal();
+
+    // Remove any consecutive duplicates of the same library...
+    Libraries.erase(std::unique(Libraries.begin(), Libraries.end()),
+                    Libraries.end());
+
+    if (LinkAsLibrary) {
+      std::vector<sys::Path> Files;
+      for (unsigned i = 0; i < InputFilenames.size(); ++i )
+        Files.push_back(sys::Path(InputFilenames[i]));
+      if (TheLinker.LinkInFiles(Files))
+        return 1; // Error already printed
+
+      // The libraries aren't linked in but are noted as "dependent" in the
+      // module.
+      for (cl::list<std::string>::const_iterator I = Libraries.begin(), 
+           E = Libraries.end(); I != E ; ++I) {
+        TheLinker.getModule()->addLibrary(*I);
+      }
+    } else {
+      // Build a list of the items from our command line
+      Linker::ItemList Items;
+      BuildLinkItems(Items, InputFilenames, Libraries);
 
-  std::auto_ptr<Module> Composite(TheLinker.releaseModule());
-
-  // Optimize the module
-  Optimize(Composite.get());
-
-  // Generate the bytecode for the optimized module.
-  std::string RealBytecodeOutput = OutputFilename;
-  if (!LinkAsLibrary) RealBytecodeOutput += ".bc";
-  GenerateBytecode(Composite.get(), RealBytecodeOutput);
-
-  // If we are not linking a library, generate either a native executable
-  // or a JIT shell script, depending upon what the user wants.
-  if (!LinkAsLibrary) {
-    // If the user wants to generate a native executable, compile it from the
-    // bytecode file.
-    //
-    // Otherwise, create a script that will run the bytecode through the JIT.
-    if (Native) {
-      // Name of the Assembly Language output file
-      sys::Path AssemblyFile ( OutputFilename);
-      AssemblyFile.appendSuffix("s");
-
-      // Mark the output files for removal if we get an interrupt.
-      sys::RemoveFileOnSignal(AssemblyFile);
-      sys::RemoveFileOnSignal(sys::Path(OutputFilename));
-
-      // Determine the locations of the llc and gcc programs.
-      sys::Path llc = FindExecutable("llc", argv[0]);
-      if (llc.isEmpty())
-        return PrintAndReturn("Failed to find llc");
-
-      sys::Path gcc = FindExecutable("gcc", argv[0]);
-      if (gcc.isEmpty())
-        return PrintAndReturn("Failed to find gcc");
-
-      // Generate an assembly language file for the bytecode.
-      if (Verbose) std::cout << "Generating Assembly Code\n";
-      GenerateAssembly(AssemblyFile.toString(), RealBytecodeOutput, llc);
-      if (Verbose) std::cout << "Generating Native Code\n";
-      GenerateNative(OutputFilename, AssemblyFile.toString(), Libraries, 
-                     gcc, envp);
-
-      // Remove the assembly language file.
-      AssemblyFile.destroyFile();
-    } else if (NativeCBE) {
-      sys::Path CFile (OutputFilename);
-      CFile.appendSuffix("cbe.c");
-
-      // Mark the output files for removal if we get an interrupt.
-      sys::RemoveFileOnSignal(CFile);
-      sys::RemoveFileOnSignal(sys::Path(OutputFilename));
-
-      // Determine the locations of the llc and gcc programs.
-      sys::Path llc = FindExecutable("llc", argv[0]);
-      if (llc.isEmpty())
-        return PrintAndReturn("Failed to find llc");
-
-      sys::Path gcc = FindExecutable("gcc", argv[0]);
-      if (gcc.isEmpty())
-        return PrintAndReturn("Failed to find gcc");
-
-      // Generate an assembly language file for the bytecode.
-      if (Verbose) std::cout << "Generating Assembly Code\n";
-      GenerateCFile(CFile.toString(), RealBytecodeOutput, llc);
-      if (Verbose) std::cout << "Generating Native Code\n";
-      GenerateNative(OutputFilename, CFile.toString(), Libraries, gcc, envp);
-
-      // Remove the assembly language file.
-      CFile.destroyFile();
+      // Link all the items together
+      if (TheLinker.LinkInItems(Items) )
+        return 1;
+    }
 
-    } else {
-      EmitShellScript(argv);
+    std::auto_ptr<Module> Composite(TheLinker.releaseModule());
+
+    // Optimize the module
+    Optimize(Composite.get());
+
+    // Generate the bytecode for the optimized module.
+    std::string RealBytecodeOutput = OutputFilename;
+    if (!LinkAsLibrary) RealBytecodeOutput += ".bc";
+    GenerateBytecode(Composite.get(), RealBytecodeOutput);
+
+    // If we are not linking a library, generate either a native executable
+    // or a JIT shell script, depending upon what the user wants.
+    if (!LinkAsLibrary) {
+      // If the user wants to generate a native executable, compile it from the
+      // bytecode file.
+      //
+      // Otherwise, create a script that will run the bytecode through the JIT.
+      if (Native) {
+        // Name of the Assembly Language output file
+        sys::Path AssemblyFile ( OutputFilename);
+        AssemblyFile.appendSuffix("s");
+
+        // Mark the output files for removal if we get an interrupt.
+        sys::RemoveFileOnSignal(AssemblyFile);
+        sys::RemoveFileOnSignal(sys::Path(OutputFilename));
+
+        // Determine the locations of the llc and gcc programs.
+        sys::Path llc = FindExecutable("llc", argv[0]);
+        if (llc.isEmpty())
+          return PrintAndReturn("Failed to find llc");
+
+        sys::Path gcc = FindExecutable("gcc", argv[0]);
+        if (gcc.isEmpty())
+          return PrintAndReturn("Failed to find gcc");
+
+        // Generate an assembly language file for the bytecode.
+        if (Verbose) std::cout << "Generating Assembly Code\n";
+        GenerateAssembly(AssemblyFile.toString(), RealBytecodeOutput, llc);
+        if (Verbose) std::cout << "Generating Native Code\n";
+        GenerateNative(OutputFilename, AssemblyFile.toString(), Libraries, 
+                       gcc, envp);
+
+        // Remove the assembly language file.
+        AssemblyFile.destroyFile();
+      } else if (NativeCBE) {
+        sys::Path CFile (OutputFilename);
+        CFile.appendSuffix("cbe.c");
+
+        // Mark the output files for removal if we get an interrupt.
+        sys::RemoveFileOnSignal(CFile);
+        sys::RemoveFileOnSignal(sys::Path(OutputFilename));
+
+        // Determine the locations of the llc and gcc programs.
+        sys::Path llc = FindExecutable("llc", argv[0]);
+        if (llc.isEmpty())
+          return PrintAndReturn("Failed to find llc");
+
+        sys::Path gcc = FindExecutable("gcc", argv[0]);
+        if (gcc.isEmpty())
+          return PrintAndReturn("Failed to find gcc");
+
+        // Generate an assembly language file for the bytecode.
+        if (Verbose) std::cout << "Generating Assembly Code\n";
+        GenerateCFile(CFile.toString(), RealBytecodeOutput, llc);
+        if (Verbose) std::cout << "Generating Native Code\n";
+        GenerateNative(OutputFilename, CFile.toString(), Libraries, gcc, envp);
+
+        // Remove the assembly language file.
+        CFile.destroyFile();
+
+      } else {
+        EmitShellScript(argv);
+      }
+    
+      // Make the script executable...
+      sys::Path(OutputFilename).makeExecutable();
+
+      // Make the bytecode file readable and directly executable in LLEE as well
+      sys::Path(RealBytecodeOutput).makeExecutable();
+      sys::Path(RealBytecodeOutput).makeReadable();
     }
-  
-    // Make the script executable...
-    sys::Path(OutputFilename).makeExecutable();
 
-    // Make the bytecode file readable and directly executable in LLEE as well
-    sys::Path(RealBytecodeOutput).makeExecutable();
-    sys::Path(RealBytecodeOutput).makeReadable();
+    return 0;
+  } catch (const std::string& msg) {
+    std::cerr << argv[0] << ": " << msg << "\n";
+  } catch (...) {
+    std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
   }
-
-  return 0;
+  return 1;
 }
diff --git a/tools/llvm-link/llvm-link.cpp b/tools/llvm-link/llvm-link.cpp
index 8d8bc4a..7176ea7 100644
--- a/tools/llvm-link/llvm-link.cpp
+++ b/tools/llvm-link/llvm-link.cpp
@@ -75,70 +75,77 @@ static inline std::auto_ptr<Module> LoadFile(const std::string &FN) {
 }
 
 int main(int argc, char **argv) {
-  cl::ParseCommandLineOptions(argc, argv, " llvm linker\n");
-  sys::PrintStackTraceOnErrorSignal();
-  assert(InputFilenames.size() > 0 && "OneOrMore is not working");
+  try {
+    cl::ParseCommandLineOptions(argc, argv, " llvm linker\n");
+    sys::PrintStackTraceOnErrorSignal();
+    assert(InputFilenames.size() > 0 && "OneOrMore is not working");
 
-  unsigned BaseArg = 0;
-  std::string ErrorMessage;
-
-  std::auto_ptr<Module> Composite(LoadFile(InputFilenames[BaseArg]));
-  if (Composite.get() == 0) {
-    std::cerr << argv[0] << ": error loading file '"
-              << InputFilenames[BaseArg] << "'\n";
-    return 1;
-  }
+    unsigned BaseArg = 0;
+    std::string ErrorMessage;
 
-  for (unsigned i = BaseArg+1; i < InputFilenames.size(); ++i) {
-    std::auto_ptr<Module> M(LoadFile(InputFilenames[i]));
-    if (M.get() == 0) {
+    std::auto_ptr<Module> Composite(LoadFile(InputFilenames[BaseArg]));
+    if (Composite.get() == 0) {
       std::cerr << argv[0] << ": error loading file '"
-                << InputFilenames[i] << "'\n";
+                << InputFilenames[BaseArg] << "'\n";
       return 1;
     }
 
-    if (Verbose) std::cerr << "Linking in '" << InputFilenames[i] << "'\n";
-
-    if (Linker::LinkModules(Composite.get(), M.get(), &ErrorMessage)) {
-      std::cerr << argv[0] << ": link error in '" << InputFilenames[i]
-                << "': " << ErrorMessage << "\n";
-      return 1;
+    for (unsigned i = BaseArg+1; i < InputFilenames.size(); ++i) {
+      std::auto_ptr<Module> M(LoadFile(InputFilenames[i]));
+      if (M.get() == 0) {
+        std::cerr << argv[0] << ": error loading file '"
+                  << InputFilenames[i] << "'\n";
+        return 1;
+      }
+
+      if (Verbose) std::cerr << "Linking in '" << InputFilenames[i] << "'\n";
+
+      if (Linker::LinkModules(Composite.get(), M.get(), &ErrorMessage)) {
+        std::cerr << argv[0] << ": link error in '" << InputFilenames[i]
+                  << "': " << ErrorMessage << "\n";
+        return 1;
+      }
     }
-  }
-
-  // TODO: Iterate over the -l list and link in any modules containing
-  // global symbols that have not been resolved so far.
 
-  if (DumpAsm) std::cerr << "Here's the assembly:\n" << Composite.get();
-
-  std::ostream *Out = &std::cout;  // Default to printing to stdout...
-  if (OutputFilename != "-") {
-    if (!Force && std::ifstream(OutputFilename.c_str())) {
-      // If force is not specified, make sure not to overwrite a file!
-      std::cerr << argv[0] << ": error opening '" << OutputFilename
-                << "': file exists!\n"
-                << "Use -f command line argument to force output\n";
-      return 1;
+    // TODO: Iterate over the -l list and link in any modules containing
+    // global symbols that have not been resolved so far.
+
+    if (DumpAsm) std::cerr << "Here's the assembly:\n" << Composite.get();
+
+    std::ostream *Out = &std::cout;  // Default to printing to stdout...
+    if (OutputFilename != "-") {
+      if (!Force && std::ifstream(OutputFilename.c_str())) {
+        // If force is not specified, make sure not to overwrite a file!
+        std::cerr << argv[0] << ": error opening '" << OutputFilename
+                  << "': file exists!\n"
+                  << "Use -f command line argument to force output\n";
+        return 1;
+      }
+      Out = new std::ofstream(OutputFilename.c_str());
+      if (!Out->good()) {
+        std::cerr << argv[0] << ": error opening '" << OutputFilename << "'!\n";
+        return 1;
+      }
+
+      // Make sure that the Out file gets unlinked from the disk if we get a
+      // SIGINT
+      sys::RemoveFileOnSignal(sys::Path(OutputFilename));
     }
-    Out = new std::ofstream(OutputFilename.c_str());
-    if (!Out->good()) {
-      std::cerr << argv[0] << ": error opening '" << OutputFilename << "'!\n";
+
+    if (verifyModule(*Composite.get())) {
+      std::cerr << argv[0] << ": linked module is broken!\n";
       return 1;
     }
 
-    // Make sure that the Out file gets unlinked from the disk if we get a
-    // SIGINT
-    sys::RemoveFileOnSignal(sys::Path(OutputFilename));
-  }
+    if (Verbose) std::cerr << "Writing bytecode...\n";
+    WriteBytecodeToFile(Composite.get(), *Out, !NoCompress);
 
-  if (verifyModule(*Composite.get())) {
-    std::cerr << argv[0] << ": linked module is broken!\n";
-    return 1;
+    if (Out != &std::cout) delete Out;
+    return 0;
+  } catch (const std::string& msg) {
+    std::cerr << argv[0] << ": " << msg << "\n";
+  } catch (...) {
+    std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
   }
-
-  if (Verbose) std::cerr << "Writing bytecode...\n";
-  WriteBytecodeToFile(Composite.get(), *Out, !NoCompress);
-
-  if (Out != &std::cout) delete Out;
-  return 0;
+  return 1;
 }
diff --git a/tools/llvm-nm/llvm-nm.cpp b/tools/llvm-nm/llvm-nm.cpp
index ba5e031..4234905 100644
--- a/tools/llvm-nm/llvm-nm.cpp
+++ b/tools/llvm-nm/llvm-nm.cpp
@@ -152,20 +152,27 @@ void DumpSymbolNamesFromFile (std::string &Filename) {
 }
 
 int main(int argc, char **argv) {
-  cl::ParseCommandLineOptions(argc, argv, " llvm symbol table dumper\n");
-  sys::PrintStackTraceOnErrorSignal();
-
-  ToolName = argv[0];
-  if (BSDFormat) OutputFormat = bsd;
-  if (POSIXFormat) OutputFormat = posix;
+  try {
+    cl::ParseCommandLineOptions(argc, argv, " llvm symbol table dumper\n");
+    sys::PrintStackTraceOnErrorSignal();
+
+    ToolName = argv[0];
+    if (BSDFormat) OutputFormat = bsd;
+    if (POSIXFormat) OutputFormat = posix;
+
+    switch (InputFilenames.size()) {
+    case 0: InputFilenames.push_back("-");
+    case 1: break;
+    default: MultipleFiles = true;
+    }
 
-  switch (InputFilenames.size()) {
-  case 0: InputFilenames.push_back("-");
-  case 1: break;
-  default: MultipleFiles = true;
+    std::for_each (InputFilenames.begin (), InputFilenames.end (),
+                   DumpSymbolNamesFromFile);
+    return 0;
+  } catch (const std::string& msg) {
+    std::cerr << argv[0] << ": " << msg << "\n";
+  } catch (...) {
+    std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
   }
-
-  std::for_each (InputFilenames.begin (), InputFilenames.end (),
-                 DumpSymbolNamesFromFile);
-  return 0;
+  return 1;
 }
diff --git a/tools/llvm-prof/llvm-prof.cpp b/tools/llvm-prof/llvm-prof.cpp
index 8834407..d6e8bb1 100644
--- a/tools/llvm-prof/llvm-prof.cpp
+++ b/tools/llvm-prof/llvm-prof.cpp
@@ -107,124 +107,131 @@ namespace {
 
 
 int main(int argc, char **argv) {
-  cl::ParseCommandLineOptions(argc, argv, " llvm profile dump decoder\n");
-  sys::PrintStackTraceOnErrorSignal();
-
-  // Read in the bytecode file...
-  std::string ErrorMessage;
-  Module *M = ParseBytecodeFile(BytecodeFile, &ErrorMessage);
-  if (M == 0) {
-    std::cerr << argv[0] << ": " << BytecodeFile << ": " << ErrorMessage
-              << "\n";
-    return 1;
-  }
-
-  // Read the profiling information
-  ProfileInfoLoader PI(argv[0], ProfileDataFile, *M);
-
-  std::map<const Function  *, unsigned> FuncFreqs;
-  std::map<const BasicBlock*, unsigned> BlockFreqs;
-  std::map<ProfileInfoLoader::Edge, unsigned> EdgeFreqs;
-
-  // Output a report.  Eventually, there will be multiple reports selectable on
-  // the command line, for now, just keep things simple.
-
-  // Emit the most frequent function table...
-  std::vector<std::pair<Function*, unsigned> > FunctionCounts;
-  PI.getFunctionCounts(FunctionCounts);
-  FuncFreqs.insert(FunctionCounts.begin(), FunctionCounts.end());
-
-  // Sort by the frequency, backwards.
-  std::sort(FunctionCounts.begin(), FunctionCounts.end(),
-            PairSecondSortReverse<Function*>());
-
-  unsigned long long TotalExecutions = 0;
-  for (unsigned i = 0, e = FunctionCounts.size(); i != e; ++i)
-    TotalExecutions += FunctionCounts[i].second;
-  
-  std::cout << "===" << std::string(73, '-') << "===\n"
-            << "LLVM profiling output for execution";
-  if (PI.getNumExecutions() != 1) std::cout << "s";
-  std::cout << ":\n";
-  
-  for (unsigned i = 0, e = PI.getNumExecutions(); i != e; ++i) {
-    std::cout << "  ";
-    if (e != 1) std::cout << i+1 << ". ";
-    std::cout << PI.getExecution(i) << "\n";
-  }
-  
-  std::cout << "\n===" << std::string(73, '-') << "===\n";
-  std::cout << "Function execution frequencies:\n\n";
-
-  // Print out the function frequencies...
-  printf(" ##   Frequency\n");
-  for (unsigned i = 0, e = FunctionCounts.size(); i != e; ++i) {
-    if (FunctionCounts[i].second == 0) {
-      printf("\n  NOTE: %d function%s never executed!\n",
-             e-i, e-i-1 ? "s were" : " was");
-      break;
+  try {
+    cl::ParseCommandLineOptions(argc, argv, " llvm profile dump decoder\n");
+    sys::PrintStackTraceOnErrorSignal();
+
+    // Read in the bytecode file...
+    std::string ErrorMessage;
+    Module *M = ParseBytecodeFile(BytecodeFile, &ErrorMessage);
+    if (M == 0) {
+      std::cerr << argv[0] << ": " << BytecodeFile << ": " << ErrorMessage
+                << "\n";
+      return 1;
     }
 
-    printf("%3d. %5u/%llu %s\n", i+1, FunctionCounts[i].second, TotalExecutions,
-           FunctionCounts[i].first->getName().c_str());
-  }
+    // Read the profiling information
+    ProfileInfoLoader PI(argv[0], ProfileDataFile, *M);
 
-  std::set<Function*> FunctionsToPrint;
+    std::map<const Function  *, unsigned> FuncFreqs;
+    std::map<const BasicBlock*, unsigned> BlockFreqs;
+    std::map<ProfileInfoLoader::Edge, unsigned> EdgeFreqs;
 
-  // If we have block count information, print out the LLVM module with
-  // frequency annotations.
-  if (PI.hasAccurateBlockCounts()) {
-    std::vector<std::pair<BasicBlock*, unsigned> > Counts;
-    PI.getBlockCounts(Counts);
+    // Output a report.  Eventually, there will be multiple reports selectable on
+    // the command line, for now, just keep things simple.
 
-    TotalExecutions = 0;
-    for (unsigned i = 0, e = Counts.size(); i != e; ++i)
-      TotalExecutions += Counts[i].second;
+    // Emit the most frequent function table...
+    std::vector<std::pair<Function*, unsigned> > FunctionCounts;
+    PI.getFunctionCounts(FunctionCounts);
+    FuncFreqs.insert(FunctionCounts.begin(), FunctionCounts.end());
 
     // Sort by the frequency, backwards.
-    std::sort(Counts.begin(), Counts.end(),
-              PairSecondSortReverse<BasicBlock*>());
+    std::sort(FunctionCounts.begin(), FunctionCounts.end(),
+              PairSecondSortReverse<Function*>());
+
+    unsigned long long TotalExecutions = 0;
+    for (unsigned i = 0, e = FunctionCounts.size(); i != e; ++i)
+      TotalExecutions += FunctionCounts[i].second;
+    
+    std::cout << "===" << std::string(73, '-') << "===\n"
+              << "LLVM profiling output for execution";
+    if (PI.getNumExecutions() != 1) std::cout << "s";
+    std::cout << ":\n";
+    
+    for (unsigned i = 0, e = PI.getNumExecutions(); i != e; ++i) {
+      std::cout << "  ";
+      if (e != 1) std::cout << i+1 << ". ";
+      std::cout << PI.getExecution(i) << "\n";
+    }
     
     std::cout << "\n===" << std::string(73, '-') << "===\n";
-    std::cout << "Top 20 most frequently executed basic blocks:\n\n";
+    std::cout << "Function execution frequencies:\n\n";
 
     // Print out the function frequencies...
-    printf(" ##      %%%% \tFrequency\n");
-    unsigned BlocksToPrint = Counts.size();
-    if (BlocksToPrint > 20) BlocksToPrint = 20;
-    for (unsigned i = 0; i != BlocksToPrint; ++i) {
-      if (Counts[i].second == 0) break;
-      Function *F = Counts[i].first->getParent();
-      printf("%3d. %5.2f%% %5u/%llu\t%s() - %s\n", i+1,
-             Counts[i].second/(double)TotalExecutions*100,
-             Counts[i].second, TotalExecutions,
-             F->getName().c_str(), Counts[i].first->getName().c_str());
-      FunctionsToPrint.insert(F);
+    printf(" ##   Frequency\n");
+    for (unsigned i = 0, e = FunctionCounts.size(); i != e; ++i) {
+      if (FunctionCounts[i].second == 0) {
+        printf("\n  NOTE: %d function%s never executed!\n",
+               e-i, e-i-1 ? "s were" : " was");
+        break;
+      }
+
+      printf("%3d. %5u/%llu %s\n", i+1, FunctionCounts[i].second, TotalExecutions,
+             FunctionCounts[i].first->getName().c_str());
     }
 
-    BlockFreqs.insert(Counts.begin(), Counts.end());
-  }
-  
-  if (PI.hasAccurateEdgeCounts()) {
-    std::vector<std::pair<ProfileInfoLoader::Edge, unsigned> > Counts;
-    PI.getEdgeCounts(Counts);
-    EdgeFreqs.insert(Counts.begin(), Counts.end());
-  }
+    std::set<Function*> FunctionsToPrint;
 
-  if (PrintAnnotatedLLVM || PrintAllCode) {
-    std::cout << "\n===" << std::string(73, '-') << "===\n";
-    std::cout << "Annotated LLVM code for the module:\n\n";
+    // If we have block count information, print out the LLVM module with
+    // frequency annotations.
+    if (PI.hasAccurateBlockCounts()) {
+      std::vector<std::pair<BasicBlock*, unsigned> > Counts;
+      PI.getBlockCounts(Counts);
+
+      TotalExecutions = 0;
+      for (unsigned i = 0, e = Counts.size(); i != e; ++i)
+        TotalExecutions += Counts[i].second;
+
+      // Sort by the frequency, backwards.
+      std::sort(Counts.begin(), Counts.end(),
+                PairSecondSortReverse<BasicBlock*>());
+      
+      std::cout << "\n===" << std::string(73, '-') << "===\n";
+      std::cout << "Top 20 most frequently executed basic blocks:\n\n";
+
+      // Print out the function frequencies...
+      printf(" ##      %%%% \tFrequency\n");
+      unsigned BlocksToPrint = Counts.size();
+      if (BlocksToPrint > 20) BlocksToPrint = 20;
+      for (unsigned i = 0; i != BlocksToPrint; ++i) {
+        if (Counts[i].second == 0) break;
+        Function *F = Counts[i].first->getParent();
+        printf("%3d. %5.2f%% %5u/%llu\t%s() - %s\n", i+1,
+               Counts[i].second/(double)TotalExecutions*100,
+               Counts[i].second, TotalExecutions,
+               F->getName().c_str(), Counts[i].first->getName().c_str());
+        FunctionsToPrint.insert(F);
+      }
+
+      BlockFreqs.insert(Counts.begin(), Counts.end());
+    }
     
-    ProfileAnnotator PA(FuncFreqs, BlockFreqs, EdgeFreqs);
-
-    if (FunctionsToPrint.empty() || PrintAllCode)
-      M->print(std::cout, &PA);
-    else
-      // Print just a subset of the functions...
-      for (std::set<Function*>::iterator I = FunctionsToPrint.begin(),
-             E = FunctionsToPrint.end(); I != E; ++I)
-        (*I)->print(std::cout, &PA);
-  }
+    if (PI.hasAccurateEdgeCounts()) {
+      std::vector<std::pair<ProfileInfoLoader::Edge, unsigned> > Counts;
+      PI.getEdgeCounts(Counts);
+      EdgeFreqs.insert(Counts.begin(), Counts.end());
+    }
 
-  return 0;
+    if (PrintAnnotatedLLVM || PrintAllCode) {
+      std::cout << "\n===" << std::string(73, '-') << "===\n";
+      std::cout << "Annotated LLVM code for the module:\n\n";
+      
+      ProfileAnnotator PA(FuncFreqs, BlockFreqs, EdgeFreqs);
+
+      if (FunctionsToPrint.empty() || PrintAllCode)
+        M->print(std::cout, &PA);
+      else
+        // Print just a subset of the functions...
+        for (std::set<Function*>::iterator I = FunctionsToPrint.begin(),
+               E = FunctionsToPrint.end(); I != E; ++I)
+          (*I)->print(std::cout, &PA);
+    }
+
+    return 0;
+  } catch (const std::string& msg) {
+    std::cerr << argv[0] << ": " << msg << "\n";
+  } catch (...) {
+    std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
+  }
+  return 1;
 }
diff --git a/tools/llvmc/llvmc.cpp b/tools/llvmc/llvmc.cpp
index fe36505..fd416b2 100644
--- a/tools/llvmc/llvmc.cpp
+++ b/tools/llvmc/llvmc.cpp
@@ -368,4 +368,5 @@ int main(int argc, char **argv) {
   } catch (...) {
     std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
   }
+  return 1;
 }
diff --git a/tools/opt/opt.cpp b/tools/opt/opt.cpp
index dcc3666..3ca5d42 100644
--- a/tools/opt/opt.cpp
+++ b/tools/opt/opt.cpp
@@ -70,102 +70,109 @@ QuietA("quiet", cl::desc("Alias for -q"), cl::aliasopt(Quiet));
 // main for opt
 //
 int main(int argc, char **argv) {
-  cl::ParseCommandLineOptions(argc, argv,
-			      " llvm .bc -> .bc modular optimizer\n");
-  sys::PrintStackTraceOnErrorSignal();
-
-  // Allocate a full target machine description only if necessary...
-  // FIXME: The choice of target should be controllable on the command line.
-  std::auto_ptr<TargetMachine> target;
-
-  TargetMachine* TM = NULL;
-  std::string ErrorMessage;
-
-  // Load the input module...
-  std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename, &ErrorMessage));
-  if (M.get() == 0) {
-    std::cerr << argv[0] << ": ";
-    if (ErrorMessage.size())
-      std::cerr << ErrorMessage << "\n";
-    else
-      std::cerr << "bytecode didn't read correctly.\n";
-    return 1;
-  }
-
-  // Figure out what stream we are supposed to write to...
-  std::ostream *Out = &std::cout;  // Default to printing to stdout...
-  if (OutputFilename != "-") {
-    if (!Force && std::ifstream(OutputFilename.c_str())) {
-      // If force is not specified, make sure not to overwrite a file!
-      std::cerr << argv[0] << ": error opening '" << OutputFilename
-                << "': file exists!\n"
-                << "Use -f command line argument to force output\n";
+  try {
+    cl::ParseCommandLineOptions(argc, argv,
+                                " llvm .bc -> .bc modular optimizer\n");
+    sys::PrintStackTraceOnErrorSignal();
+
+    // Allocate a full target machine description only if necessary...
+    // FIXME: The choice of target should be controllable on the command line.
+    std::auto_ptr<TargetMachine> target;
+
+    TargetMachine* TM = NULL;
+    std::string ErrorMessage;
+
+    // Load the input module...
+    std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename, &ErrorMessage));
+    if (M.get() == 0) {
+      std::cerr << argv[0] << ": ";
+      if (ErrorMessage.size())
+        std::cerr << ErrorMessage << "\n";
+      else
+        std::cerr << "bytecode didn't read correctly.\n";
       return 1;
     }
-    Out = new std::ofstream(OutputFilename.c_str());
 
-    if (!Out->good()) {
-      std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
-      return 1;
+    // Figure out what stream we are supposed to write to...
+    std::ostream *Out = &std::cout;  // Default to printing to stdout...
+    if (OutputFilename != "-") {
+      if (!Force && std::ifstream(OutputFilename.c_str())) {
+        // If force is not specified, make sure not to overwrite a file!
+        std::cerr << argv[0] << ": error opening '" << OutputFilename
+                  << "': file exists!\n"
+                  << "Use -f command line argument to force output\n";
+        return 1;
+      }
+      Out = new std::ofstream(OutputFilename.c_str());
+
+      if (!Out->good()) {
+        std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
+        return 1;
+      }
+
+      // Make sure that the Output file gets unlinked from the disk if we get a
+      // SIGINT
+      sys::RemoveFileOnSignal(sys::Path(OutputFilename));
     }
 
-    // Make sure that the Output file gets unlinked from the disk if we get a
-    // SIGINT
-    sys::RemoveFileOnSignal(sys::Path(OutputFilename));
-  }
-
-  // If the output is set to be emitted to standard out, and standard out is a
-  // console, print out a warning message and refuse to do it.  We don't impress
-  // anyone by spewing tons of binary goo to a terminal.
-  if (Out == &std::cout && isStandardOutAConsole() && !Force && !NoOutput 
-      && !Quiet) {
-    std::cerr << "WARNING: It looks like you're attempting to print out a "
-              << "bytecode file.  I'm\ngoing to pretend you didn't ask me to do"
-              << " this (for your own good).  If you\nREALLY want to taste LLVM"
-              << " bytecode first-hand, you can force output with the\n`-f'"
-              << " option.\n\n";
-    NoOutput = true;
-  }
+    // If the output is set to be emitted to standard out, and standard out is a
+    // console, print out a warning message and refuse to do it.  We don't impress
+    // anyone by spewing tons of binary goo to a terminal.
+    if (Out == &std::cout && isStandardOutAConsole() && !Force && !NoOutput 
+        && !Quiet) {
+      std::cerr << "WARNING: It looks like you're attempting to print out a "
+                << "bytecode file.  I'm\ngoing to pretend you didn't ask me to do"
+                << " this (for your own good).  If you\nREALLY want to taste LLVM"
+                << " bytecode first-hand, you can force output with the\n`-f'"
+                << " option.\n\n";
+      NoOutput = true;
+    }
 
-  // Create a PassManager to hold and optimize the collection of passes we are
-  // about to build...
-  //
-  PassManager Passes;
-
-  // Add an appropriate TargetData instance for this module...
-  Passes.add(new TargetData("opt", M.get()));
-
-  // Create a new optimization pass for each one specified on the command line
-  for (unsigned i = 0; i < OptimizationList.size(); ++i) {
-    const PassInfo *Opt = OptimizationList[i];
-    
-    if (Opt->getNormalCtor())
-      Passes.add(Opt->getNormalCtor()());
-    else if (Opt->getTargetCtor()) {
+    // Create a PassManager to hold and optimize the collection of passes we are
+    // about to build...
+    //
+    PassManager Passes;
+
+    // Add an appropriate TargetData instance for this module...
+    Passes.add(new TargetData("opt", M.get()));
+
+    // Create a new optimization pass for each one specified on the command line
+    for (unsigned i = 0; i < OptimizationList.size(); ++i) {
+      const PassInfo *Opt = OptimizationList[i];
+      
+      if (Opt->getNormalCtor())
+        Passes.add(Opt->getNormalCtor()());
+      else if (Opt->getTargetCtor()) {
 #if 0
-      if (target.get() == NULL)
-        target.reset(allocateSparcTargetMachine()); // FIXME: target option
+        if (target.get() == NULL)
+          target.reset(allocateSparcTargetMachine()); // FIXME: target option
 #endif
-      assert(target.get() && "Could not allocate target machine!");
-      Passes.add(Opt->getTargetCtor()(*target.get()));
-    } else
-      std::cerr << argv[0] << ": cannot create pass: " << Opt->getPassName()
-                << "\n";
-
-    if (PrintEachXForm)
-      Passes.add(new PrintModulePass(&std::cerr));
-  }
+        assert(target.get() && "Could not allocate target machine!");
+        Passes.add(Opt->getTargetCtor()(*target.get()));
+      } else
+        std::cerr << argv[0] << ": cannot create pass: " << Opt->getPassName()
+                  << "\n";
+
+      if (PrintEachXForm)
+        Passes.add(new PrintModulePass(&std::cerr));
+    }
 
-  // Check that the module is well formed on completion of optimization
-  if (!NoVerify)
-    Passes.add(createVerifierPass());
+    // Check that the module is well formed on completion of optimization
+    if (!NoVerify)
+      Passes.add(createVerifierPass());
 
-  // Write bytecode out to disk or cout as the last step...
-  if (!NoOutput)
-    Passes.add(new WriteBytecodePass(Out, Out != &std::cout));
+    // Write bytecode out to disk or cout as the last step...
+    if (!NoOutput)
+      Passes.add(new WriteBytecodePass(Out, Out != &std::cout));
 
-  // Now that we have all of the passes ready, run them.
-  Passes.run(*M.get());
+    // Now that we have all of the passes ready, run them.
+    Passes.run(*M.get());
 
-  return 0;
+    return 0;
+  } catch (const std::string& msg) {
+    std::cerr << argv[0] << ": " << msg << "\n";
+  } catch (...) {
+    std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
+  }
+  return 1;
 }