lib/VMCore/IRBuilder.cpp

   1 //===---- IRBuilder.cpp - Builder for LLVM Instrs -------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file implements the IRBuilder class, which is used as a convenient way
  11 // to create LLVM instructions with a consistent and simplified interface.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "llvm/Support/IRBuilder.h"
  16 #include "llvm/GlobalVariable.h"
  17 #include "llvm/Function.h"
  18 #include "llvm/Intrinsics.h"
  19 #include "llvm/LLVMContext.h"
  20 using namespace llvm;
  21
  22 /// CreateGlobalString - Make a new global variable with an initializer that
  23 /// has array of i8 type filled in with the nul terminated string value
  24 /// specified.  If Name is specified, it is the name of the global variable
  25 /// created.
  26 Value *IRBuilderBase::CreateGlobalString(const char *Str, const Twine &Name) {
  27   Constant *StrConstant = ConstantArray::get(Context, Str, true);
  28   Module &M = *BB->getParent()->getParent();
  29   GlobalVariable *GV = new GlobalVariable(M, StrConstant->getType(),
  30                                           true, GlobalValue::InternalLinkage,
  31                                           StrConstant, "", 0, false);
  32   GV->setName(Name);
  33   return GV;
  34 }
  35
  36 const Type *IRBuilderBase::getCurrentFunctionReturnType() const {
  37   assert(BB && BB->getParent() && "No current function!");
  38   return BB->getParent()->getReturnType();
  39 }
  40
  41 Value *IRBuilderBase::getCastedInt8PtrValue(Value *Ptr) {
  42   const PointerType *PT = cast<PointerType>(Ptr->getType());
  43   if (PT->getElementType()->isIntegerTy(8))
  44     return Ptr;
  45
  46   // Otherwise, we need to insert a bitcast.
  47   PT = getInt8PtrTy(PT->getAddressSpace());
  48   BitCastInst *BCI = new BitCastInst(Ptr, PT, "");
  49   BB->getInstList().insert(InsertPt, BCI);
  50   SetInstDebugLocation(BCI);
  51   return BCI;
  52 }
  53
  54 static CallInst *createCallHelper(Value *Callee, Value *const* Ops,
  55                                   unsigned NumOps, IRBuilderBase *Builder) {
  56   CallInst *CI = CallInst::Create(Callee, Ops, Ops + NumOps, "");
  57   Builder->GetInsertBlock()->getInstList().insert(Builder->GetInsertPoint(),CI);
  58   Builder->SetInstDebugLocation(CI);
  59   return CI;
  60 }
  61
  62
  63 CallInst *IRBuilderBase::
  64 CreateMemSet(Value *Ptr, Value *Val, Value *Size, unsigned Align,
  65              bool isVolatile, MDNode *TBAATag) {
  66   Ptr = getCastedInt8PtrValue(Ptr);
  67   Value *Ops[] = { Ptr, Val, Size, getInt32(Align), getInt1(isVolatile) };
  68   const Type *Tys[] = { Ptr->getType(), Size->getType() };
  69   Module *M = BB->getParent()->getParent();
  70   Value *TheFn = Intrinsic::getDeclaration(M, Intrinsic::memset, Tys, 2);
  71
  72   CallInst *CI = createCallHelper(TheFn, Ops, 5, this);
  73
  74   // Set the TBAA info if present.
  75   if (TBAATag)
  76     CI->setMetadata(LLVMContext::MD_tbaa, TBAATag);
  77
  78   return CI;
  79 }
  80
  81 CallInst *IRBuilderBase::
  82 CreateMemCpy(Value *Dst, Value *Src, Value *Size, unsigned Align,
  83              bool isVolatile, MDNode *TBAATag) {
  84   Dst = getCastedInt8PtrValue(Dst);
  85   Src = getCastedInt8PtrValue(Src);
  86
  87   Value *Ops[] = { Dst, Src, Size, getInt32(Align), getInt1(isVolatile) };
  88   const Type *Tys[] = { Dst->getType(), Src->getType(), Size->getType() };
  89   Module *M = BB->getParent()->getParent();
  90   Value *TheFn = Intrinsic::getDeclaration(M, Intrinsic::memcpy, Tys, 3);
  91
  92   CallInst *CI = createCallHelper(TheFn, Ops, 5, this);
  93
  94   // Set the TBAA info if present.
  95   if (TBAATag)
  96     CI->setMetadata(LLVMContext::MD_tbaa, TBAATag);
  97
  98   return CI;
  99 }
 100
 101 CallInst *IRBuilderBase::
 102 CreateMemMove(Value *Dst, Value *Src, Value *Size, unsigned Align,
 103               bool isVolatile, MDNode *TBAATag) {
 104   Dst = getCastedInt8PtrValue(Dst);
 105   Src = getCastedInt8PtrValue(Src);
 106
 107   Value *Ops[] = { Dst, Src, Size, getInt32(Align), getInt1(isVolatile) };
 108   const Type *Tys[] = { Dst->getType(), Src->getType(), Size->getType() };
 109   Module *M = BB->getParent()->getParent();
 110   Value *TheFn = Intrinsic::getDeclaration(M, Intrinsic::memmove, Tys, 3);
 111
 112   CallInst *CI = createCallHelper(TheFn, Ops, 5, this);
 113
 114   // Set the TBAA info if present.
 115   if (TBAATag)
 116     CI->setMetadata(LLVMContext::MD_tbaa, TBAATag);
 117
 118   return CI;
 119 }