X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FTransforms%2FInstrumentation%2FEdgeProfiling.cpp;h=e8ef2654d2564ff8268db778b8a62f19e7c24c46;hb=22689b6034dbde1c08e39b162fd59e1fd5d35b96;hp=ef334f22f3353fcb91d1a37afa3ac44d26a350b5;hpb=954da37bb492b519f5c31dc360f2a142567e08b4;p=oota-llvm.git

diff --git a/lib/Transforms/Instrumentation/EdgeProfiling.cpp b/lib/Transforms/Instrumentation/EdgeProfiling.cpp
index ef334f22f33..e8ef2654d25 100644
--- a/lib/Transforms/Instrumentation/EdgeProfiling.cpp
+++ b/lib/Transforms/Instrumentation/EdgeProfiling.cpp
@@ -1,10 +1,10 @@
 //===- EdgeProfiling.cpp - Insert counters for edge profiling -------------===//
-// 
+//
 //                      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 is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
 //===----------------------------------------------------------------------===//
 //
 // This pass instruments the specified program with counters for edge profiling.
@@ -16,37 +16,55 @@
 // number of counters inserted.
 //
 //===----------------------------------------------------------------------===//
+#define DEBUG_TYPE "insert-edge-profiling"
 
-#include "llvm/Constants.h"
-#include "llvm/DerivedTypes.h"
+#include "ProfilingUtils.h"
 #include "llvm/Module.h"
 #include "llvm/Pass.h"
+#include "llvm/Support/raw_ostream.h"
 #include "llvm/Transforms/Utils/BasicBlockUtils.h"
-#include "ProfilingUtils.h"
-#include <iostream>
+#include "llvm/Transforms/Instrumentation.h"
+#include "llvm/ADT/Statistic.h"
 #include <set>
 using namespace llvm;
 
+STATISTIC(NumEdgesInserted, "The # of edges inserted.");
+
 namespace {
-  class EdgeProfiler : public Pass {
-    bool run(Module &M);
-  };
+  class EdgeProfiler : public ModulePass {
+    bool runOnModule(Module &M);
+  public:
+    static char ID; // Pass identification, replacement for typeid
+    EdgeProfiler() : ModulePass(ID) {
+      initializeEdgeProfilerPass(*PassRegistry::getPassRegistry());
+    }
 
-  RegisterOpt<EdgeProfiler> X("insert-edge-profiling",
-                              "Insert instrumentation for edge profiling");
+    virtual const char *getPassName() const {
+      return "Edge Profiler";
+    }
+  };
 }
 
-bool EdgeProfiler::run(Module &M) {
-  Function *Main = M.getMainFunction();
+char EdgeProfiler::ID = 0;
+INITIALIZE_PASS(EdgeProfiler, "insert-edge-profiling",
+                "Insert instrumentation for edge profiling", false, false)
+
+ModulePass *llvm::createEdgeProfilerPass() { return new EdgeProfiler(); }
+
+bool EdgeProfiler::runOnModule(Module &M) {
+  Function *Main = M.getFunction("main");
   if (Main == 0) {
-    std::cerr << "WARNING: cannot insert edge profiling into a module"
-              << " with no main function!\n";
+    errs() << "WARNING: cannot insert edge profiling into a module"
+           << " with no main function!\n";
     return false;  // No main, no instrumentation!
   }
 
   std::set<BasicBlock*> BlocksToInstrument;
   unsigned NumEdges = 0;
-  for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F)
+  for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
+    if (F->isDeclaration()) continue;
+    // Reserve space for (0,entry) edge.
+    ++NumEdges;
     for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
       // Keep track of which blocks need to be instrumented.  We don't want to
       // instrument blocks that are added as the result of breaking critical
@@ -54,17 +72,20 @@ bool EdgeProfiler::run(Module &M) {
       BlocksToInstrument.insert(BB);
       NumEdges += BB->getTerminator()->getNumSuccessors();
     }
+  }
 
-  const Type *ATy = ArrayType::get(Type::UIntTy, NumEdges);
+  Type *ATy = ArrayType::get(Type::getInt32Ty(M.getContext()), NumEdges);
   GlobalVariable *Counters =
-    new GlobalVariable(ATy, false, GlobalValue::InternalLinkage,
-                       Constant::getNullValue(ATy), "EdgeProfCounters", &M);
-
-  ConstantPointerRef *CounterCPR = ConstantPointerRef::get(Counters);
+    new GlobalVariable(M, ATy, false, GlobalValue::InternalLinkage,
+                       Constant::getNullValue(ATy), "EdgeProfCounters");
+  NumEdgesInserted = NumEdges;
 
   // Instrument all of the edges...
   unsigned i = 0;
-  for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F)
+  for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
+    if (F->isDeclaration()) continue;
+    // Create counter for (0,entry) edge.
+    IncrementCounterInBlock(&F->getEntryBlock(), i++, Counters);
     for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
       if (BlocksToInstrument.count(BB)) {  // Don't instrument inserted blocks
         // Okay, we have to add a counter of each outgoing edge.  If the
@@ -78,15 +99,16 @@ bool EdgeProfiler::run(Module &M) {
           // Okay, we are guaranteed that the edge is no longer critical.  If we
           // only have a single successor, insert the counter in this block,
           // otherwise insert it in the successor block.
-          if (TI->getNumSuccessors() == 0) {
+          if (TI->getNumSuccessors() == 1) {
             // Insert counter at the start of the block
-            IncrementCounterInBlock(BB, i++, CounterCPR);
+            IncrementCounterInBlock(BB, i++, Counters, false);
           } else {
             // Insert counter at the start of the block
-            IncrementCounterInBlock(TI->getSuccessor(s), i++, CounterCPR);
+            IncrementCounterInBlock(TI->getSuccessor(s), i++, Counters);
           }
         }
       }
+  }
 
   // Add the initialization call to main.
   InsertProfilingInitCall(Main, "llvm_start_edge_profiling", Counters);