Moved over EmitFunctions to this library

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2928 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Instrumentation/EmitFunctions.cpp

@@ -0,0 +1,45 @@
+//===-- EmitFunctions.cpp - interface to insert instrumentation --*- C++ -*--=//
+//
+// This inserts a global constant table with function pointers all along
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Transforms/Instrumentation/EmitFunctions.h"
+#include "llvm/Constants.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Constants.h"
+#include "llvm/Module.h"
+
+using std::vector;
+
+struct EmitFunctionTable : public Pass {
+  const char *getPassName() const { return "EmitFunctionTablePass"; }
+
+  bool run(Module &M);
+};
+
+// Create a new pass to add function table
+//
+Pass *createEmitFunctionTablePass() {
+  return new EmitFunctionTable();
+}
+
+// Per Module pass for inserting function table
+bool EmitFunctionTable::run(Module &M){
+  vector<const Type*> vType;
+  vector<Constant *> vConsts;
+  for(Module::iterator MI = M.begin(), ME = M.end(); MI!=ME; ++MI)
+    if (!MI->isExternal()) {
+      ConstantPointerRef *CP = ConstantPointerRef::get(MI);
+      vType.push_back(MI->getType());
+      vConsts.push_back(CP);
+    }
+  
+  StructType *sttype = StructType::get(vType);
+  ConstantStruct *cstruct = ConstantStruct::get(sttype, vConsts);
+
+  GlobalVariable *gb = new GlobalVariable(cstruct->getType(), true, false, 
+                                          cstruct, "llvmFunctionTable");
+  M.getGlobalList().push_back(gb);
+  return true;  // Always modifies program
+}