'Pass' should now not be derived from by clients. Instead, they should derive

[oota-llvm.git] / lib / Transforms / Instrumentation / EmitFunctions.cpp

diff --git a/lib/Transforms/Instrumentation/EmitFunctions.cpp b/lib/Transforms/Instrumentation/EmitFunctions.cpp
index 32488d69b53ae9a0e7716ae4808807d22504fd7f..92abffb8ead090183c7ee907abb1a8260090643c 100644 (file)
--- a/lib/Transforms/Instrumentation/EmitFunctions.cpp
+++ b/lib/Transforms/Instrumentation/EmitFunctions.cpp
@@ -1,6 +1,15 @@
-//===-- EmitFunctions.cpp - interface to insert instrumentation --*- C++ -*--=//
+//===-- EmitFunctions.cpp - interface to insert instrumentation -----------===//
+// 
+//                     The LLVM Compiler Infrastructure
 //
-// This inserts a global constant table with function pointers all along
+// 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 inserts a global constant table with function pointers all along.
+//
+// NOTE: This pass is used by the reoptimizer only.
 //
 //===----------------------------------------------------------------------===//
 
@@ -8,34 +17,94 @@
 #include "llvm/DerivedTypes.h"
 #include "llvm/Module.h"
 #include "llvm/Pass.h"
-
-using std::vector;
+#include "llvm/Support/CFG.h"
+using namespace llvm;
 
 namespace {
-  struct EmitFunctionTable : public Pass {
-    bool run(Module &M);
+  enum Color{
+    WHITE,
+    GREY,
+    BLACK
+  };
+  
+  struct EmitFunctionTable : public ModulePass {
+    bool runOnModule(Module &M);
   };
   
-  RegisterOpt<EmitFunctionTable> X("emitfuncs", "Emit a Function Table");
+  RegisterOpt<EmitFunctionTable>
+  X("emitfuncs", "Emit a function table for the reoptimizer");
+}
+
+static char doDFS(BasicBlock * node,std::map<BasicBlock *, Color > &color){
+  color[node] = GREY;
+
+  for(succ_iterator vl = succ_begin(node), ve = succ_end(node); vl != ve; ++vl){
+   
+    BasicBlock *BB = *vl; 
+    
+    if(color[BB]!=GREY && color[BB]!=BLACK){
+      if(!doDFS(BB, color)){
+       return 0;
+      }
+    }
+
+    //if has backedge
+    else if(color[BB]==GREY)
+      return 0;
+
+  }
+
+  color[node] = BLACK;
+  return 1;
+}
+
+static char hasBackEdge(Function *F){
+  std::map<BasicBlock *, Color > color;
+  return doDFS(F->begin(), color);
 }
 
 // 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)
+bool EmitFunctionTable::runOnModule(Module &M){
+  std::vector<const Type*> vType;
+ 
+  std::vector<Constant *> vConsts;
+  std::vector<Constant *> sBCons;
+
+  unsigned int counter = 0;
+  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);
+    
+      //std::cerr<<MI;
+
+      vConsts.push_back(MI);
+      sBCons.push_back(ConstantInt::get(Type::SByteTy, hasBackEdge(MI)));
+      
+      counter++;
     }
   
   StructType *sttype = StructType::get(vType);
-  ConstantStruct *cstruct = ConstantStruct::get(sttype, vConsts);
+  Constant *cstruct = ConstantStruct::get(sttype, vConsts);
 
   GlobalVariable *gb = new GlobalVariable(cstruct->getType(), true,
                                           GlobalValue::ExternalLinkage, 
                                           cstruct, "llvmFunctionTable");
   M.getGlobalList().push_back(gb);
+
+  Constant *constArray = ConstantArray::get(ArrayType::get(Type::SByteTy, 
+                                                               sBCons.size()),
+                                                sBCons);
+
+  GlobalVariable *funcArray = new GlobalVariable(constArray->getType(), true,
+                                             GlobalValue::ExternalLinkage,
+                                             constArray, "llvmSimpleFunction");
+
+  M.getGlobalList().push_back(funcArray);
+
+  ConstantInt *cnst = ConstantSInt::get(Type::IntTy, counter); 
+  GlobalVariable *fnCount = new GlobalVariable(Type::IntTy, true, 
+                                              GlobalValue::ExternalLinkage, 
+                                              cnst, "llvmFunctionCount");
+  M.getGlobalList().push_back(fnCount);
   return true;  // Always modifies program
 }