Initial checkin of the "Hello World" Pass.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3266 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Hello/Hello.cpp

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+//===- Hello.cpp - Example code from "Writing an LLVM Pass" ---------------===//
+//
+// This file implements two versions of the LLVM "Hello World" pass described
+// in docs/WritingAnLLVMPass.html
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Pass.h"
+#include "llvm/Function.h"
+
+namespace {
+  // Hello - The first implementation, without getAnalysisUsage.
+  struct Hello : public FunctionPass {
+    virtual bool runOnFunction(Function &F) {
+      std::cerr << "Hello: " << F.getName() << "\n";
+      return false;
+    }
+  }; 
+  RegisterOpt<Hello> X("hello", "Hello World Pass");
+
+  // Hello2 - The second implementation with getAnalysisUsage implemented.
+  struct Hello2 : public FunctionPass {
+    virtual bool runOnFunction(Function &F) {
+      std::cerr << "Hello: " << F.getName() << "\n";
+      return false;
+    }
+
+    // We don't modify the program, so we preserve all analyses
+    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+      AU.setPreservesAll();
+    };
+  }; 
+  RegisterOpt<Hello2> Y("hello2", "Hello World Pass (with getAnalysisUsage implemented)");
+}

lib/Transforms/Hello/Makefile

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+LEVEL = ../../..
+LIBRARYNAME = hello
+SHARED_LIBRARY = 1
+
+include $(LEVEL)/Makefile.common
+