For PR872:

Shrinkify LLVM's footprint by removing the analyze tool and moving its
functionality into the opt tool. THis eliminates one of the largest tools
from LLVM and doesn't make opt much bigger because it already included
most of the analysis passes.  To get the old analyze functionality pass
the -analyze option to opt. Note that the integeration here is dead
simple. The "main" of analyze was just copied to opt and invoked if the
-analyze option was given. There may be opportunities for further
integration such as removing the distinction between transform passes
and analysis passes.

To use the analysis functionality, if you previously did this:
  analyze $FNAME -domset -disable-verify
you would now do this:
  opt -analyze $FNAME -domset -disable-verify
Pretty simple.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29762 91177308-0d34-0410-b5e6-96231b3b80d8

8 files changed, 153 insertions, 478 deletions

diff --git a/tools/Makefile b/tools/Makefile
index 99e73960ac..649c655be9 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -9,8 +9,7 @@
 
 LEVEL := ..
 PARALLEL_DIRS := llvm-config llvm-as llvm-dis opt gccas llc llvm-link lli gccld\
-                 llvm-stub analyze llvm-extract llvm-nm llvm-prof llvm-ar \
-		 llvm-ranlib llvm-bcanalyzer llvmc llvm-ld llvm-db bugpoint \
-                 llvm2cpp
+                 llvm-stub llvm-extract llvm-nm llvm-prof llvm-ar llvm-ranlib \
+		 llvm-bcanalyzer llvmc llvm-ld llvm-db bugpoint llvm2cpp
 
 include $(LEVEL)/Makefile.common
diff --git a/tools/analyze/AnalysisWrappers.cpp b/tools/analyze/AnalysisWrappers.cpp
deleted file mode 100644
index b371d50ef3..0000000000
--- a/tools/analyze/AnalysisWrappers.cpp
+++ /dev/null
@@ -1,81 +0,0 @@
-//===- AnalysisWrappers.cpp - Wrappers around non-pass analyses -----------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file defines pass wrappers around LLVM analyses that don't make sense to
-// be passes.  It provides a nice standard pass interface to these classes so
-// that they can be printed out by analyze.
-//
-// These classes are separated out of analyze.cpp so that it is more clear which
-// code is the integral part of the analyze tool, and which part of the code is
-// just making it so more passes are available.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Module.h"
-#include "llvm/Pass.h"
-#include "llvm/Support/CallSite.h"
-#include "llvm/Analysis/CallGraph.h"
-#include <iostream>
-using namespace llvm;
-
-namespace {
-  /// ExternalFunctionsPassedConstants - This pass prints out call sites to
-  /// external functions that are called with constant arguments.  This can be
-  /// useful when looking for standard library functions we should constant fold
-  /// or handle in alias analyses.
-  struct ExternalFunctionsPassedConstants : public ModulePass {
-    virtual bool runOnModule(Module &M) {
-      for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
-        if (I->isExternal()) {
-          bool PrintedFn = false;
-          for (Value::use_iterator UI = I->use_begin(), E = I->use_end();
-               UI != E; ++UI)
-            if (Instruction *User = dyn_cast<Instruction>(*UI)) {
-              CallSite CS = CallSite::get(User);
-              if (CS.getInstruction()) {
-                for (CallSite::arg_iterator AI = CS.arg_begin(),
-                       E = CS.arg_end(); AI != E; ++AI)
-                  if (isa<Constant>(*AI)) {
-                    if (!PrintedFn) {
-                      std::cerr << "Function '" << I->getName() << "':\n";
-                      PrintedFn = true;
-                    }
-                    std::cerr << *User;
-                    break;
-                  }
-              }
-            }
-        }
-
-      return false;
-    }
-
-    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
-      AU.setPreservesAll();
-    }
-  };
-
-  RegisterAnalysis<ExternalFunctionsPassedConstants>
-  P1("externalfnconstants", "Print external fn callsites passed constants");
-  
-  struct CallGraphPrinter : public ModulePass {
-    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
-      AU.setPreservesAll();
-      AU.addRequired<CallGraph>();
-    }
-    virtual bool runOnModule(Module &M) { return false; }
-
-    virtual void print(std::ostream &OS, const Module *M) const {
-      getAnalysis<CallGraph>().print(OS, M);
-    }
-  };
-  
-  RegisterAnalysis<CallGraphPrinter>
-    P2("callgraph", "Print a call graph");
-}
diff --git a/tools/analyze/GraphPrinters.cpp b/tools/analyze/GraphPrinters.cpp
deleted file mode 100644
index 8826cd2a77..0000000000
--- a/tools/analyze/GraphPrinters.cpp
+++ /dev/null
@@ -1,77 +0,0 @@
-//===- GraphPrinters.cpp - DOT printers for various graph types -----------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file defines several printers for various different types of graphs used
-// by the LLVM infrastructure.  It uses the generic graph interface to convert
-// the graph into a .dot graph.  These graphs can then be processed with the
-// "dot" tool to convert them to postscript or some other suitable format.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Support/GraphWriter.h"
-#include "llvm/Pass.h"
-#include "llvm/Value.h"
-#include "llvm/Analysis/CallGraph.h"
-#include <fstream>
-using namespace llvm;
-
-template<typename GraphType>
-static void WriteGraphToFile(std::ostream &O, const std::string &GraphName,
-                             const GraphType &GT) {
-  std::string Filename = GraphName + ".dot";
-  O << "Writing '" << Filename << "'...";
-  std::ofstream F(Filename.c_str());
-
-  if (F.good())
-    WriteGraph(F, GT);
-  else
-    O << "  error opening file for writing!";
-  O << "\n";
-}
-
-
-//===----------------------------------------------------------------------===//
-//                              Call Graph Printer
-//===----------------------------------------------------------------------===//
-
-namespace llvm {
-  template<>
-  struct DOTGraphTraits<CallGraph*> : public DefaultDOTGraphTraits {
-    static std::string getGraphName(CallGraph *F) {
-      return "Call Graph";
-    }
-
-    static std::string getNodeLabel(CallGraphNode *Node, CallGraph *Graph) {
-      if (Node->getFunction())
-        return ((Value*)Node->getFunction())->getName();
-      else
-        return "Indirect call node";
-    }
-  };
-}
-
-
-namespace {
-  struct CallGraphPrinter : public ModulePass {
-    virtual bool runOnModule(Module &M) {
-      WriteGraphToFile(std::cerr, "callgraph", &getAnalysis<CallGraph>());
-      return false;
-    }
-
-    void print(std::ostream &OS) const {}
-
-    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
-      AU.addRequired<CallGraph>();
-      AU.setPreservesAll();
-    }
-  };
-
-  RegisterAnalysis<CallGraphPrinter> P2("print-callgraph",
-                                        "Print Call Graph to 'dot' file");
-}
diff --git a/tools/analyze/Makefile b/tools/analyze/Makefile
deleted file mode 100644
index e3885a9358..0000000000
--- a/tools/analyze/Makefile
+++ /dev/null
@@ -1,17 +0,0 @@
-##===- tools/analyze/Makefile ------------------------------*- Makefile -*-===##
-# 
-#                     The LLVM Compiler Infrastructure
-#
-# This file was developed by the LLVM research group and is distributed under
-# the University of Illinois Open Source License. See LICENSE.TXT for details.
-# 
-##===----------------------------------------------------------------------===##
-LEVEL = ../..
-TOOLNAME = analyze
-USEDLIBS = LLVMAsmParser.a LLVMBCReader.a LLVMAnalysis.a LLVMipa.a \
-           LLVMDataStructure \
-	   LLVMScalarOpts.a LLVMTransforms.a LLVMTarget.a LLVMScalarOpts.a \
-	   LLVMTransformUtils.a LLVMCore.a LLVMSupport.a LLVMbzip2.a LLVMSystem.a
-REQUIRES_EH := 1
-
-include $(LEVEL)/Makefile.common
diff --git a/tools/analyze/PrintSCC.cpp b/tools/analyze/PrintSCC.cpp
deleted file mode 100644
index c0adf5ca03..0000000000
--- a/tools/analyze/PrintSCC.cpp
+++ /dev/null
@@ -1,105 +0,0 @@
-//===- PrintSCC.cpp - Enumerate SCCs in some key graphs -------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file provides passes to print out SCCs in a CFG or a CallGraph.
-// Normally, you would not use these passes; instead, you would use the
-// scc_iterator directly to enumerate SCCs and process them in some way.  These
-// passes serve three purposes:
-//
-// (1) As a reference for how to use the scc_iterator.
-// (2) To print out the SCCs for a CFG or a CallGraph:
-//       analyze -cfgscc            to print the SCCs in each CFG of a module.
-//       analyze -cfgscc -stats     to print the #SCCs and the maximum SCC size.
-//       analyze -cfgscc -debug > /dev/null to watch the algorithm in action.
-//
-//     and similarly:
-//       analyze -callscc [-stats] [-debug] to print SCCs in the CallGraph
-//
-// (3) To test the scc_iterator.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Pass.h"
-#include "llvm/Module.h"
-#include "llvm/Analysis/CallGraph.h"
-#include "llvm/Support/CFG.h"
-#include "llvm/ADT/SCCIterator.h"
-#include <iostream>
-using namespace llvm;
-
-namespace {
-  struct CFGSCC : public FunctionPass {
-    bool runOnFunction(Function& func);
-
-    void print(std::ostream &O, const Module* = 0) const { }
-
-    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
-      AU.setPreservesAll();
-    }
-  };
-
-  struct CallGraphSCC : public ModulePass {
-    // run - Print out SCCs in the call graph for the specified module.
-    bool runOnModule(Module &M);
-
-    void print(std::ostream &O, const Module* = 0) const { }
-
-    // getAnalysisUsage - This pass requires the CallGraph.
-    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
-      AU.setPreservesAll();
-      AU.addRequired<CallGraph>();
-    }
-  };
-
-  RegisterAnalysis<CFGSCC>
-  Y("cfgscc", "Print SCCs of each function CFG");
-
-  RegisterAnalysis<CallGraphSCC>
-  Z("callscc", "Print SCCs of the Call Graph");
-}
-
-bool CFGSCC::runOnFunction(Function &F) {
-  unsigned sccNum = 0;
-  std::cout << "SCCs for Function " << F.getName() << " in PostOrder:";
-  for (scc_iterator<Function*> SCCI = scc_begin(&F),
-         E = scc_end(&F); SCCI != E; ++SCCI) {
-    std::vector<BasicBlock*> &nextSCC = *SCCI;
-    std::cout << "\nSCC #" << ++sccNum << " : ";
-    for (std::vector<BasicBlock*>::const_iterator I = nextSCC.begin(),
-           E = nextSCC.end(); I != E; ++I)
-      std::cout << (*I)->getName() << ", ";
-    if (nextSCC.size() == 1 && SCCI.hasLoop())
-      std::cout << " (Has self-loop).";
-  }
-  std::cout << "\n";
-
-  return true;
-}
-
-
-// run - Print out SCCs in the call graph for the specified module.
-bool CallGraphSCC::runOnModule(Module &M) {
-  CallGraphNode* rootNode = getAnalysis<CallGraph>().getRoot();
-  unsigned sccNum = 0;
-  std::cout << "SCCs for the program in PostOrder:";
-  for (scc_iterator<CallGraphNode*> SCCI = scc_begin(rootNode),
-         E = scc_end(rootNode); SCCI != E; ++SCCI) {
-    const std::vector<CallGraphNode*> &nextSCC = *SCCI;
-    std::cout << "\nSCC #" << ++sccNum << " : ";
-    for (std::vector<CallGraphNode*>::const_iterator I = nextSCC.begin(),
-           E = nextSCC.end(); I != E; ++I)
-      std::cout << ((*I)->getFunction() ? (*I)->getFunction()->getName()
-                    : std::string("Indirect CallGraph node")) << ", ";
-    if (nextSCC.size() == 1 && SCCI.hasLoop())
-      std::cout << " (Has self-loop).";
-  }
-  std::cout << "\n";
-
-  return true;
-}
diff --git a/tools/analyze/analyze.cpp b/tools/analyze/analyze.cpp
deleted file mode 100644
index e6b2be5ada..0000000000
--- a/tools/analyze/analyze.cpp
+++ /dev/null
@@ -1,188 +0,0 @@
-//===- analyze.cpp - The LLVM analyze utility -----------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This utility is designed to print out the results of running various analysis
-// passes on a program.  This is useful for understanding a program, or for
-// debugging an analysis pass.
-//
-//  analyze --help           - Output information about command line switches
-//  analyze --quiet          - Do not print analysis name before output
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Module.h"
-#include "llvm/PassManager.h"
-#include "llvm/Bytecode/Reader.h"
-#include "llvm/Assembly/Parser.h"
-#include "llvm/Analysis/Verifier.h"
-#include "llvm/Analysis/LinkAllAnalyses.h"
-#include "llvm/Target/TargetData.h"
-#include "llvm/Support/PassNameParser.h"
-#include "llvm/System/Signals.h"
-#include "llvm/Support/PluginLoader.h"
-#include "llvm/Support/Timer.h"
-#include "llvm/LinkAllVMCore.h"
-#include <algorithm>
-
-using namespace llvm;
-
-namespace {
-  cl::opt<std::string>
-  InputFilename(cl::Positional, cl::desc("<input file>"), cl::init("-"),
-                cl::value_desc("filename"));
-
-  cl::opt<bool> Quiet("q", cl::desc("Don't print analysis pass names"));
-  cl::alias    QuietA("quiet", cl::desc("Alias for -q"),
-                      cl::aliasopt(Quiet));
-
-  cl::opt<bool> NoVerify("disable-verify", cl::Hidden,
-                         cl::desc("Do not verify input module"));
-
-  // The AnalysesList is automatically populated with registered Passes by the
-  // PassNameParser.
-  //
-  cl::list<const PassInfo*, bool, FilteredPassNameParser<PassInfo::Analysis> >
-  AnalysesList(cl::desc("Analyses available:"));
-
-  Timer BytecodeLoadTimer("Bytecode Loader");
-}
-
-struct ModulePassPrinter : public ModulePass {
-  const PassInfo *PassToPrint;
-  ModulePassPrinter(const PassInfo *PI) : PassToPrint(PI) {}
-
-  virtual bool runOnModule(Module &M) {
-    if (!Quiet) {
-      std::cout << "Printing analysis '" << PassToPrint->getPassName() << "':\n";
-      getAnalysisID<Pass>(PassToPrint).print(std::cout, &M);
-    }
-
-    // Get and print pass...
-    return false;
-  }
-
-  virtual const char *getPassName() const { return "'Pass' Printer"; }
-
-  virtual void getAnalysisUsage(AnalysisUsage &AU) const {
-    AU.addRequiredID(PassToPrint);
-    AU.setPreservesAll();
-  }
-};
-
-struct FunctionPassPrinter : public FunctionPass {
-  const PassInfo *PassToPrint;
-  FunctionPassPrinter(const PassInfo *PI) : PassToPrint(PI) {}
-
-  virtual bool runOnFunction(Function &F) {
-    if (!Quiet) {
-      std::cout << "Printing analysis '" << PassToPrint->getPassName()
-		<< "' for function '" << F.getName() << "':\n";
-    }
-    // Get and print pass...
-    getAnalysisID<Pass>(PassToPrint).print(std::cout, F.getParent());
-    return false;
-  }
-
-  virtual const char *getPassName() const { return "FunctionPass Printer"; }
-
-  virtual void getAnalysisUsage(AnalysisUsage &AU) const {
-    AU.addRequiredID(PassToPrint);
-    AU.setPreservesAll();
-  }
-};
-
-struct BasicBlockPassPrinter : public BasicBlockPass {
-  const PassInfo *PassToPrint;
-  BasicBlockPassPrinter(const PassInfo *PI) : PassToPrint(PI) {}
-
-  virtual bool runOnBasicBlock(BasicBlock &BB) {
-    if (!Quiet) {
-      std::cout << "Printing Analysis info for BasicBlock '" << BB.getName()
-		<< "': Pass " << PassToPrint->getPassName() << ":\n";
-    }
-
-    // Get and print pass...
-    getAnalysisID<Pass>(PassToPrint).print(std::cout, BB.getParent()->getParent());
-    return false;
-  }
-
-  virtual const char *getPassName() const { return "BasicBlockPass Printer"; }
-
-  virtual void getAnalysisUsage(AnalysisUsage &AU) const {
-    AU.addRequiredID(PassToPrint);
-    AU.setPreservesAll();
-  }
-};
-
-
-
-int main(int argc, char **argv) {
-  try {
-    cl::ParseCommandLineOptions(argc, argv, " llvm analysis printer tool\n");
-    sys::PrintStackTraceOnErrorSignal();
-
-    Module *CurMod = 0;
-    try {
-#if 0
-      TimeRegion RegionTimer(BytecodeLoadTimer);
-#endif
-      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;
-    }
-
-    // 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(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";
-    }
-
-    Passes.run(*CurMod);
-
-    delete CurMod;
-    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/opt/Makefile b/tools/opt/Makefile
index f310639c08..9e4cddfa97 100644
--- a/tools/opt/Makefile
+++ b/tools/opt/Makefile
@@ -10,9 +10,9 @@ LEVEL = ../..
 TOOLNAME = opt
 REQUIRES_EH := 1
 
-USEDLIBS = LLVMBCReader.a LLVMBCWriter.a LLVMInstrumentation.a \
-	   LLVMScalarOpts.a LLVMipo.a LLVMipa.a LLVMDataStructure LLVMTransforms.a \
-	   LLVMTarget.a LLVMTransformUtils.a LLVMAnalysis.a LLVMCore.a LLVMSupport.a \
-	   LLVMbzip2.a LLVMSystem.a 
+USEDLIBS = LLVMAsmParser.a LLVMBCReader.a LLVMBCWriter.a LLVMInstrumentation.a \
+	   LLVMScalarOpts.a LLVMipo.a LLVMipa.a LLVMDataStructure \
+	   LLVMTransforms.a LLVMTarget.a LLVMTransformUtils.a LLVMAnalysis.a \
+	   LLVMCore.a LLVMSupport.a LLVMbzip2.a LLVMSystem.a 
 
 include $(LEVEL)/Makefile.common
diff --git a/tools/opt/opt.cpp b/tools/opt/opt.cpp
index 096506ff39..b67892bb34 100644
--- a/tools/opt/opt.cpp
+++ b/tools/opt/opt.cpp
@@ -8,11 +8,12 @@
 //===----------------------------------------------------------------------===//
 //
 // Optimizations may be specified an arbitrary number of times on the command
-// line, they are run in the order specified.
+// line, They are run in the order specified.
 //
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Module.h"
+#include "llvm/Assembly/Parser.h"
 #include "llvm/PassManager.h"
 #include "llvm/Bytecode/Reader.h"
 #include "llvm/Bytecode/WriteBytecodePass.h"
@@ -24,6 +25,8 @@
 #include "llvm/System/Signals.h"
 #include "llvm/Support/PluginLoader.h"
 #include "llvm/Support/SystemUtils.h"
+#include "llvm/Support/Timer.h"
+#include "llvm/Analysis/LinkAllAnalyses.h"
 #include "llvm/Transforms/LinkAllPasses.h"
 #include "llvm/LinkAllVMCore.h"
 #include <fstream>
@@ -43,7 +46,8 @@ OptimizationList(cl::desc("Optimizations available:"));
 // Other command line options...
 //
 static cl::opt<std::string>
-InputFilename(cl::Positional, cl::desc("<input bytecode>"), cl::init("-"));
+InputFilename(cl::Positional, cl::desc("<input bytecode file>"), 
+    cl::init("-"), cl::value_desc("filename"));
 
 static cl::opt<std::string>
 OutputFilename("o", cl::desc("Override output filename"),
@@ -68,6 +72,91 @@ Quiet("q", cl::desc("Obsolete option"), cl::Hidden);
 static cl::alias
 QuietA("quiet", cl::desc("Alias for -q"), cl::aliasopt(Quiet));
 
+static cl::opt<bool>
+AnalyzeOnly("analyze", cl::desc("Only perform analysis, no optimization"));
+
+// The AnalysesList is automatically populated with registered Passes by the
+// PassNameParser.
+static 
+  cl::list<const PassInfo*, bool, FilteredPassNameParser<PassInfo::Analysis> >
+  AnalysesList(cl::desc("Analyses available:"));
+
+static Timer BytecodeLoadTimer("Bytecode Loader");
+
+// ---------- Define Printers for module and function passes ------------
+namespace {
+
+struct ModulePassPrinter : public ModulePass {
+  const PassInfo *PassToPrint;
+  ModulePassPrinter(const PassInfo *PI) : PassToPrint(PI) {}
+
+  virtual bool runOnModule(Module &M) {
+    if (!Quiet) {
+      std::cout << "Printing analysis '" << PassToPrint->getPassName() 
+                << "':\n";
+      getAnalysisID<Pass>(PassToPrint).print(std::cout, &M);
+    }
+
+    // Get and print pass...
+    return false;
+  }
+
+  virtual const char *getPassName() const { return "'Pass' Printer"; }
+
+  virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+    AU.addRequiredID(PassToPrint);
+    AU.setPreservesAll();
+  }
+};
+
+struct FunctionPassPrinter : public FunctionPass {
+  const PassInfo *PassToPrint;
+  FunctionPassPrinter(const PassInfo *PI) : PassToPrint(PI) {}
+
+  virtual bool runOnFunction(Function &F) {
+    if (!Quiet) {
+      std::cout << "Printing analysis '" << PassToPrint->getPassName()
+		<< "' for function '" << F.getName() << "':\n";
+    }
+    // Get and print pass...
+    getAnalysisID<Pass>(PassToPrint).print(std::cout, F.getParent());
+    return false;
+  }
+
+  virtual const char *getPassName() const { return "FunctionPass Printer"; }
+
+  virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+    AU.addRequiredID(PassToPrint);
+    AU.setPreservesAll();
+  }
+};
+
+struct BasicBlockPassPrinter : public BasicBlockPass {
+  const PassInfo *PassToPrint;
+  BasicBlockPassPrinter(const PassInfo *PI) : PassToPrint(PI) {}
+
+  virtual bool runOnBasicBlock(BasicBlock &BB) {
+    if (!Quiet) {
+      std::cout << "Printing Analysis info for BasicBlock '" << BB.getName()
+		<< "': Pass " << PassToPrint->getPassName() << ":\n";
+    }
+
+    // Get and print pass...
+    getAnalysisID<Pass>(PassToPrint).print(
+      std::cout, BB.getParent()->getParent());
+    return false;
+  }
+
+  virtual const char *getPassName() const { return "BasicBlockPass Printer"; }
+
+  virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+    AU.addRequiredID(PassToPrint);
+    AU.setPreservesAll();
+  }
+};
+
+} // anonymous namespace
+
 
 //===----------------------------------------------------------------------===//
 // main for opt
@@ -75,9 +164,63 @@ QuietA("quiet", cl::desc("Alias for -q"), cl::aliasopt(Quiet));
 int main(int argc, char **argv) {
   try {
     cl::ParseCommandLineOptions(argc, argv,
-                                " llvm .bc -> .bc modular optimizer\n");
+      " llvm .bc -> .bc modular optimizer and analysis printer \n");
     sys::PrintStackTraceOnErrorSignal();
 
+    if (AnalyzeOnly) {
+      Module *CurMod = 0;
+      try {
+#if 0
+        TimeRegion RegionTimer(BytecodeLoadTimer);
+#endif
+        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;
+      }
+
+      // 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(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";
+      }
+
+      Passes.run(*CurMod);
+
+      delete CurMod;
+      return 0;
+    }
+
     // 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;
@@ -169,6 +312,7 @@ int main(int argc, char **argv) {
     Passes.run(*M.get());
 
     return 0;
+
   } catch (const std::string& msg) {
     std::cerr << argv[0] << ": " << msg << "\n";
   } catch (...) {