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/Function.h"
16 #include "llvm/GlobalVariable.h"
17 #include "llvm/IRBuilder.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.
CreateGlobalString(StringRef Str,const Twine & Name)26 Value *IRBuilderBase::CreateGlobalString(StringRef Str, const Twine &Name) {
27 Constant *StrConstant = ConstantDataArray::getString(Context, Str);
28 Module &M = *BB->getParent()->getParent();
29 GlobalVariable *GV = new GlobalVariable(M, StrConstant->getType(),
30 true, GlobalValue::PrivateLinkage,
31 StrConstant);
32 GV->setName(Name);
33 GV->setUnnamedAddr(true);
34 return GV;
35 }
36
getCurrentFunctionReturnType() const37 Type *IRBuilderBase::getCurrentFunctionReturnType() const {
38 assert(BB && BB->getParent() && "No current function!");
39 return BB->getParent()->getReturnType();
40 }
41
getCastedInt8PtrValue(Value * Ptr)42 Value *IRBuilderBase::getCastedInt8PtrValue(Value *Ptr) {
43 PointerType *PT = cast<PointerType>(Ptr->getType());
44 if (PT->getElementType()->isIntegerTy(8))
45 return Ptr;
46
47 // Otherwise, we need to insert a bitcast.
48 PT = getInt8PtrTy(PT->getAddressSpace());
49 BitCastInst *BCI = new BitCastInst(Ptr, PT, "");
50 BB->getInstList().insert(InsertPt, BCI);
51 SetInstDebugLocation(BCI);
52 return BCI;
53 }
54
createCallHelper(Value * Callee,ArrayRef<Value * > Ops,IRBuilderBase * Builder)55 static CallInst *createCallHelper(Value *Callee, ArrayRef<Value *> Ops,
56 IRBuilderBase *Builder) {
57 CallInst *CI = CallInst::Create(Callee, Ops, "");
58 Builder->GetInsertBlock()->getInstList().insert(Builder->GetInsertPoint(),CI);
59 Builder->SetInstDebugLocation(CI);
60 return CI;
61 }
62
63 CallInst *IRBuilderBase::
CreateMemSet(Value * Ptr,Value * Val,Value * Size,unsigned Align,bool isVolatile,MDNode * TBAATag)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 Type *Tys[] = { Ptr->getType(), Size->getType() };
69 Module *M = BB->getParent()->getParent();
70 Value *TheFn = Intrinsic::getDeclaration(M, Intrinsic::memset, Tys);
71
72 CallInst *CI = createCallHelper(TheFn, Ops, 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::
CreateMemCpy(Value * Dst,Value * Src,Value * Size,unsigned Align,bool isVolatile,MDNode * TBAATag)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 Type *Tys[] = { Dst->getType(), Src->getType(), Size->getType() };
89 Module *M = BB->getParent()->getParent();
90 Value *TheFn = Intrinsic::getDeclaration(M, Intrinsic::memcpy, Tys);
91
92 CallInst *CI = createCallHelper(TheFn, Ops, 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::
CreateMemMove(Value * Dst,Value * Src,Value * Size,unsigned Align,bool isVolatile,MDNode * TBAATag)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 Type *Tys[] = { Dst->getType(), Src->getType(), Size->getType() };
109 Module *M = BB->getParent()->getParent();
110 Value *TheFn = Intrinsic::getDeclaration(M, Intrinsic::memmove, Tys);
111
112 CallInst *CI = createCallHelper(TheFn, Ops, this);
113
114 // Set the TBAA info if present.
115 if (TBAATag)
116 CI->setMetadata(LLVMContext::MD_tbaa, TBAATag);
117
118 return CI;
119 }
120
CreateLifetimeStart(Value * Ptr,ConstantInt * Size)121 CallInst *IRBuilderBase::CreateLifetimeStart(Value *Ptr, ConstantInt *Size) {
122 assert(isa<PointerType>(Ptr->getType()) &&
123 "lifetime.start only applies to pointers.");
124 Ptr = getCastedInt8PtrValue(Ptr);
125 if (!Size)
126 Size = getInt64(-1);
127 else
128 assert(Size->getType() == getInt64Ty() &&
129 "lifetime.start requires the size to be an i64");
130 Value *Ops[] = { Size, Ptr };
131 Module *M = BB->getParent()->getParent();
132 Value *TheFn = Intrinsic::getDeclaration(M, Intrinsic::lifetime_start);
133 return createCallHelper(TheFn, Ops, this);
134 }
135
CreateLifetimeEnd(Value * Ptr,ConstantInt * Size)136 CallInst *IRBuilderBase::CreateLifetimeEnd(Value *Ptr, ConstantInt *Size) {
137 assert(isa<PointerType>(Ptr->getType()) &&
138 "lifetime.end only applies to pointers.");
139 Ptr = getCastedInt8PtrValue(Ptr);
140 if (!Size)
141 Size = getInt64(-1);
142 else
143 assert(Size->getType() == getInt64Ty() &&
144 "lifetime.end requires the size to be an i64");
145 Value *Ops[] = { Size, Ptr };
146 Module *M = BB->getParent()->getParent();
147 Value *TheFn = Intrinsic::getDeclaration(M, Intrinsic::lifetime_end);
148 return createCallHelper(TheFn, Ops, this);
149 }
150