It's not necessary to do rounding for alloca operations when the requested

alignment is equal to the stack alignment.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 119 insertions, 0 deletions

diff --git a/lib/Transforms/Instrumentation/ProfilingUtils.cpp b/lib/Transforms/Instrumentation/ProfilingUtils.cpp
new file mode 100644
index 0000000000..54ea8036de
--- /dev/null
+++ b/lib/Transforms/Instrumentation/ProfilingUtils.cpp
@@ -0,0 +1,119 @@
+//===- 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::Int8Ty));
+  const PointerType *UIntPtr = PointerType::get(Type::Int32Ty);
+  Module &M = *MainFn->getParent();
+  Constant *InitFn = M.getOrInsertFunction(FnName, Type::Int32Ty, Type::Int32Ty,
+                                           ArgVTy, UIntPtr, Type::Int32Ty,
+                                           (Type *)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::Int32Ty);
+  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;
+
+  std::vector<Constant*> GEPIndices(2, Constant::getNullValue(Type::Int32Ty));
+  unsigned NumElements = 0;
+  if (Array) {
+    Args[2] = ConstantExpr::getGetElementPtr(Array, &GEPIndices[0],
+                                             GEPIndices.size());
+    NumElements =
+      cast<ArrayType>(Array->getType()->getElementType())->getNumElements();
+  } else {
+    // If this profiling instrumentation doesn't have a constant array, just
+    // pass null.
+    Args[2] = ConstantPointerNull::get(UIntPtr);
+  }
+  Args[3] = ConstantInt::get(Type::Int32Ty, NumElements);
+
+  Instruction *InitCall = new CallInst(InitFn, &Args[0], Args.size(),
+                                       "newargc", InsertPos);
+
+  // If argc or argv are not available in main, just pass null values in.
+  Function::arg_iterator AI;
+  switch (MainFn->arg_size()) {
+  default:
+  case 2:
+    AI = MainFn->arg_begin(); ++AI;
+    if (AI->getType() != ArgVTy) {
+      Instruction::CastOps opcode = CastInst::getCastOpcode(AI, false, ArgVTy, 
+                                                            false);
+      InitCall->setOperand(2, 
+          CastInst::create(opcode, AI, ArgVTy, "argv.cast", InitCall));
+    } else {
+      InitCall->setOperand(2, AI);
+    }
+    /* FALL THROUGH */
+
+  case 1:
+    AI = MainFn->arg_begin();
+    // If the program looked at argc, have it look at the return value of the
+    // init call instead.
+    if (AI->getType() != Type::Int32Ty) {
+      Instruction::CastOps opcode;
+      if (!AI->use_empty()) {
+        opcode = CastInst::getCastOpcode(InitCall, true, AI->getType(), true);
+        AI->replaceAllUsesWith(
+          CastInst::create(opcode, InitCall, AI->getType(), "", InsertPos));
+      }
+      opcode = CastInst::getCastOpcode(AI, true, Type::Int32Ty, true);
+      InitCall->setOperand(1, 
+          CastInst::create(opcode, AI, Type::Int32Ty, "argc.cast", InitCall));
+    } else {
+      AI->replaceAllUsesWith(InitCall);
+      InitCall->setOperand(1, AI);
+    }
+
+  case 0: break;
+  }
+}
+
+void llvm::IncrementCounterInBlock(BasicBlock *BB, unsigned CounterNum,
+                                   GlobalValue *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::Int32Ty);
+  Indices[1] = ConstantInt::get(Type::Int32Ty, CounterNum);
+  Constant *ElementPtr = 
+    ConstantExpr::getGetElementPtr(CounterArray, &Indices[0], Indices.size());
+
+  // Load, increment and store the value back.
+  Value *OldVal = new LoadInst(ElementPtr, "OldFuncCounter", InsertPos);
+  Value *NewVal = BinaryOperator::create(Instruction::Add, OldVal,
+                                         ConstantInt::get(Type::Int32Ty, 1),
+                                         "NewFuncCounter", InsertPos);
+  new StoreInst(NewVal, ElementPtr, InsertPos);
+}