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
diff --git a/lib/Transforms/Instrumentation/ProfilingUtils.cpp b/lib/Transforms/Instrumentation/ProfilingUtils.cpp
new file mode 100644
index 0000000..54ea803
--- /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);
+}