Begin sketching out a bitcode verifier pass. Idea is to emit a .bc file and

then read the file back in to verify use-list serialization/deserialization.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146439 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Bitcode/ReaderWriter.h

@@ -60,8 +60,12 @@ namespace llvm {
   /// createBitcodeWriterPass - Create and return a pass that writes the module
   /// to the specified ostream.
   ModulePass *createBitcodeWriterPass(raw_ostream &Str);
-  
-  
+
+  /// createBitcodeVerifierPass - Create a pass that writes a module to disk and
+  /// then reads the module back in to verify bitcode serialization and
+  /// deserialization.
+  ModulePass *createBitcodeVerifierPass(raw_ostream &Str);
+
   /// isBitcodeWrapper - Return true if the given bytes are the magic bytes
   /// for an LLVM IR bitcode wrapper.
   ///

lib/Bitcode/Writer/BitcodeVerifier.cpp

@@ -0,0 +1,54 @@
+//===--- Bitcode/Writer/BitcodeVerifier.cpp - Bitcode Writer ----------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// BitcodeVerifier implementation.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Pass.h"
+#include "llvm/Bitcode/ReaderWriter.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace llvm;
+
+namespace {
+  struct VerifyBitcode : public ModulePass {
+    raw_ostream &OS; // raw_ostream to read from
+  public:
+    static char ID; // Pass identification, replacement for typeid
+    explicit VerifyBitcode(raw_ostream &o)
+      : ModulePass(ID), OS(o) {}
+    
+    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+    }
+
+    const char *getPassName() const { return "Bitcode Verifier"; }
+    
+    bool runOnModule(Module &M) {
+      Verify(M);
+      return false;
+    }
+
+    void Verify(Module &M);
+  };
+}
+
+char VerifyBitcode::ID = 0;
+
+/// createBitcodeVerifierPass - Create a pass that writes a module to disk and
+/// then reads the module back in to verify bitcode serialization and
+/// deserialization.
+ModulePass *llvm::createBitcodeVerifierPass(raw_ostream &Str) {
+  return new VerifyBitcode(Str);
+}
+
+void VerifyBitcode::Verify(Module &M) {
+  dbgs() << "BitcodeVerifier!\n";
+}