Split utility functions out of BlockProfiling.cpp

llvm-svn: 12224

3 files changed, 137 insertions, 85 deletions

diff --git a/llvm/lib/Transforms/Instrumentation/BlockProfiling.cpp b/llvm/lib/Transforms/Instrumentation/BlockProfiling.cpp
index 8dacc92bc26..c518821a6dd 100644
--- a/llvm/lib/Transforms/Instrumentation/BlockProfiling.cpp
+++ b/llvm/lib/Transforms/Instrumentation/BlockProfiling.cpp
@@ -21,93 +21,11 @@
 
 #include "llvm/Constants.h"
 #include "llvm/DerivedTypes.h"
-#include "llvm/Instructions.h"
 #include "llvm/Module.h"
 #include "llvm/Pass.h"
+#include "ProfilingUtils.h"
 using namespace llvm;
 
-static void insertInitializationCall(Function *MainFn, const char *FnName,
-                                     GlobalValue *Array) {
-  const Type *ArgVTy = PointerType::get(PointerType::get(Type::SByteTy));
-  const Type *UIntPtr = PointerType::get(Type::UIntTy);
-  Module &M = *MainFn->getParent();
-  Function *InitFn = M.getOrInsertFunction(FnName, Type::IntTy, Type::IntTy,
-                                           ArgVTy, UIntPtr, Type::UIntTy, 0);
-
-  // This could force argc and argv into programs that wouldn't otherwise have
-  // them, but instead we just pass null values in.
-  std::vector<Value*> Args(4);
-  Args[0] = Constant::getNullValue(Type::IntTy);
-  Args[1] = Constant::getNullValue(ArgVTy);
-
-  // Skip over any allocas in the entry block.
-  BasicBlock *Entry = MainFn->begin();
-  BasicBlock::iterator InsertPos = Entry->begin();
-  while (isa<AllocaInst>(InsertPos)) ++InsertPos;
-
-  ConstantPointerRef *ArrayCPR = ConstantPointerRef::get(Array);
-  std::vector<Constant*> GEPIndices(2, Constant::getNullValue(Type::LongTy));
-  Args[2] = ConstantExpr::getGetElementPtr(ArrayCPR, GEPIndices);
-  
-  unsigned NumElements =
-    cast<ArrayType>(Array->getType()->getElementType())->getNumElements();
-  Args[3] = ConstantUInt::get(Type::UIntTy, NumElements);
-  
-  Instruction *InitCall = new CallInst(InitFn, Args, "newargc", InsertPos);
-
-  // If argc or argv are not available in main, just pass null values in.
-  Function::aiterator AI;
-  switch (MainFn->asize()) {
-  default:
-  case 2:
-    AI = MainFn->abegin(); ++AI;
-    if (AI->getType() != ArgVTy) {
-      InitCall->setOperand(2, new CastInst(AI, ArgVTy, "argv.cast", InitCall));
-    } else {
-      InitCall->setOperand(2, AI);
-    }
-
-  case 1:
-    AI = MainFn->abegin();
-    // If the program looked at argc, have it look at the return value of the
-    // init call instead.
-    if (AI->getType() != Type::IntTy) {
-      if (!AI->use_empty())
-        AI->replaceAllUsesWith(new CastInst(InitCall, AI->getType(), "",
-                                            InsertPos));
-      InitCall->setOperand(1, new CastInst(AI, Type::IntTy, "argc.cast",
-                                           InitCall));
-    } else {
-      AI->replaceAllUsesWith(InitCall);
-      InitCall->setOperand(1, AI);
-    }
-    
-  case 0: break;
-  }
-}
-
-static void IncrementCounterInBlock(BasicBlock *BB, unsigned CounterNum,
-                                    ConstantPointerRef *CounterArray) {
-  // Insert the increment after any alloca or PHI instructions...
-  BasicBlock::iterator InsertPos = BB->begin();
-  while (isa<AllocaInst>(InsertPos) || isa<PHINode>(InsertPos))
-    ++InsertPos;
-
-  // Create the getelementptr constant expression
-  std::vector<Constant*> Indices(2);
-  Indices[0] = Constant::getNullValue(Type::LongTy);
-  Indices[1] = ConstantSInt::get(Type::LongTy, CounterNum);
-  Constant *ElementPtr = ConstantExpr::getGetElementPtr(CounterArray, Indices);
-
-  // Load, increment and store the value back.
-  Value *OldVal = new LoadInst(ElementPtr, "OldFuncCounter", InsertPos);
-  Value *NewVal = BinaryOperator::create(Instruction::Add, OldVal,
-                                         ConstantInt::get(Type::UIntTy, 1),
-                                         "NewFuncCounter", InsertPos);
-  new StoreInst(NewVal, ElementPtr, InsertPos);
-}
-
-
 namespace {
   class FunctionProfiler : public Pass {
     bool run(Module &M);
@@ -145,7 +63,7 @@ bool FunctionProfiler::run(Module &M) {
       IncrementCounterInBlock(I->begin(), i++, CounterCPR);
 
   // Add the initialization call to main.
-  insertInitializationCall(Main, "llvm_start_func_profiling", Counters);
+  InsertProfilingInitCall(Main, "llvm_start_func_profiling", Counters);
   return true;
 }
 
@@ -186,7 +104,7 @@ bool BlockProfiler::run(Module &M) {
       IncrementCounterInBlock(BB, i++, CounterCPR);
 
   // Add the initialization call to main.
-  insertInitializationCall(Main, "llvm_start_block_profiling", Counters);
+  InsertProfilingInitCall(Main, "llvm_start_block_profiling", Counters);
   return true;
 }
 
diff --git a/llvm/lib/Transforms/Instrumentation/ProfilingUtils.cpp b/llvm/lib/Transforms/Instrumentation/ProfilingUtils.cpp
new file mode 100644
index 00000000000..5baefe9b365
--- /dev/null
+++ b/llvm/lib/Transforms/Instrumentation/ProfilingUtils.cpp
@@ -0,0 +1,102 @@
+//===- ProfilingUtils.cpp - Helper functions shared by profilers ----------===//
+// 
+//                     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 files implements a few helper functions which are used by profile
+// instrumentation code to instrument the code.  This allows the profiler pass
+// to worry about *what* to insert, and these functions take care of *how* to do
+// it.
+//
+//===----------------------------------------------------------------------===//
+
+#include "ProfilingUtils.h"
+#include "llvm/Constants.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Instructions.h"
+#include "llvm/Module.h"
+
+void llvm::InsertProfilingInitCall(Function *MainFn, const char *FnName,
+                                   GlobalValue *Array) {
+  const Type *ArgVTy = PointerType::get(PointerType::get(Type::SByteTy));
+  const Type *UIntPtr = PointerType::get(Type::UIntTy);
+  Module &M = *MainFn->getParent();
+  Function *InitFn = M.getOrInsertFunction(FnName, Type::IntTy, Type::IntTy,
+                                           ArgVTy, UIntPtr, Type::UIntTy, 0);
+
+  // This could force argc and argv into programs that wouldn't otherwise have
+  // them, but instead we just pass null values in.
+  std::vector<Value*> Args(4);
+  Args[0] = Constant::getNullValue(Type::IntTy);
+  Args[1] = Constant::getNullValue(ArgVTy);
+
+  // Skip over any allocas in the entry block.
+  BasicBlock *Entry = MainFn->begin();
+  BasicBlock::iterator InsertPos = Entry->begin();
+  while (isa<AllocaInst>(InsertPos)) ++InsertPos;
+
+  ConstantPointerRef *ArrayCPR = ConstantPointerRef::get(Array);
+  std::vector<Constant*> GEPIndices(2, Constant::getNullValue(Type::LongTy));
+  Args[2] = ConstantExpr::getGetElementPtr(ArrayCPR, GEPIndices);
+  
+  unsigned NumElements =
+    cast<ArrayType>(Array->getType()->getElementType())->getNumElements();
+  Args[3] = ConstantUInt::get(Type::UIntTy, NumElements);
+  
+  Instruction *InitCall = new CallInst(InitFn, Args, "newargc", InsertPos);
+
+  // If argc or argv are not available in main, just pass null values in.
+  Function::aiterator AI;
+  switch (MainFn->asize()) {
+  default:
+  case 2:
+    AI = MainFn->abegin(); ++AI;
+    if (AI->getType() != ArgVTy) {
+      InitCall->setOperand(2, new CastInst(AI, ArgVTy, "argv.cast", InitCall));
+    } else {
+      InitCall->setOperand(2, AI);
+    }
+
+  case 1:
+    AI = MainFn->abegin();
+    // If the program looked at argc, have it look at the return value of the
+    // init call instead.
+    if (AI->getType() != Type::IntTy) {
+      if (!AI->use_empty())
+        AI->replaceAllUsesWith(new CastInst(InitCall, AI->getType(), "",
+                                            InsertPos));
+      InitCall->setOperand(1, new CastInst(AI, Type::IntTy, "argc.cast",
+                                           InitCall));
+    } else {
+      AI->replaceAllUsesWith(InitCall);
+      InitCall->setOperand(1, AI);
+    }
+    
+  case 0: break;
+  }
+}
+
+void llvm::IncrementCounterInBlock(BasicBlock *BB, unsigned CounterNum,
+                                   ConstantPointerRef *CounterArray) {
+  // Insert the increment after any alloca or PHI instructions...
+  BasicBlock::iterator InsertPos = BB->begin();
+  while (isa<AllocaInst>(InsertPos) || isa<PHINode>(InsertPos))
+    ++InsertPos;
+
+  // Create the getelementptr constant expression
+  std::vector<Constant*> Indices(2);
+  Indices[0] = Constant::getNullValue(Type::LongTy);
+  Indices[1] = ConstantSInt::get(Type::LongTy, CounterNum);
+  Constant *ElementPtr = ConstantExpr::getGetElementPtr(CounterArray, Indices);
+
+  // Load, increment and store the value back.
+  Value *OldVal = new LoadInst(ElementPtr, "OldFuncCounter", InsertPos);
+  Value *NewVal = BinaryOperator::create(Instruction::Add, OldVal,
+                                         ConstantInt::get(Type::UIntTy, 1),
+                                         "NewFuncCounter", InsertPos);
+  new StoreInst(NewVal, ElementPtr, InsertPos);
+}
diff --git a/llvm/lib/Transforms/Instrumentation/ProfilingUtils.h b/llvm/lib/Transforms/Instrumentation/ProfilingUtils.h
new file mode 100644
index 00000000000..7e8b85f4db4
--- /dev/null
+++ b/llvm/lib/Transforms/Instrumentation/ProfilingUtils.h
@@ -0,0 +1,32 @@
+//===- ProfilingUtils.h - Helper functions shared by profilers --*- C++ -*-===//
+// 
+//                     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 files defines a few helper functions which are used by profile
+// instrumentation code to instrument the code.  This allows the profiler pass
+// to worry about *what* to insert, and these functions take care of *how* to do
+// it.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef PROFILINGUTILS_H
+#define PROFILINGUTILS_H
+
+namespace llvm {
+  class Function;
+  class GlobalValue;
+  class ConstantPointerRef;
+  class BasicBlock;
+
+  void InsertProfilingInitCall(Function *MainFn, const char *FnName,
+                               GlobalValue *Arr);
+  void IncrementCounterInBlock(BasicBlock *BB, unsigned CounterNum,
+                               ConstantPointerRef *CounterArray);
+}
+
+#endif