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/IR/Function.h"
16 #include "llvm/IR/GlobalVariable.h"
17 #include "llvm/IR/IRBuilder.h"
18 #include "llvm/IR/Intrinsics.h"
19 #include "llvm/IR/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,MDNode * TBAAStructTag)82 CreateMemCpy(Value *Dst, Value *Src, Value *Size, unsigned Align,
83 bool isVolatile, MDNode *TBAATag, MDNode *TBAAStructTag) {
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 // Set the TBAA Struct info if present.
99 if (TBAAStructTag)
100 CI->setMetadata(LLVMContext::MD_tbaa_struct, TBAAStructTag);
101
102 return CI;
103 }
104
105 CallInst *IRBuilderBase::
CreateMemMove(Value * Dst,Value * Src,Value * Size,unsigned Align,bool isVolatile,MDNode * TBAATag)106 CreateMemMove(Value *Dst, Value *Src, Value *Size, unsigned Align,
107 bool isVolatile, MDNode *TBAATag) {
108 Dst = getCastedInt8PtrValue(Dst);
109 Src = getCastedInt8PtrValue(Src);
110
111 Value *Ops[] = { Dst, Src, Size, getInt32(Align), getInt1(isVolatile) };
112 Type *Tys[] = { Dst->getType(), Src->getType(), Size->getType() };
113 Module *M = BB->getParent()->getParent();
114 Value *TheFn = Intrinsic::getDeclaration(M, Intrinsic::memmove, Tys);
115
116 CallInst *CI = createCallHelper(TheFn, Ops, this);
117
118 // Set the TBAA info if present.
119 if (TBAATag)
120 CI->setMetadata(LLVMContext::MD_tbaa, TBAATag);
121
122 return CI;
123 }
124
CreateLifetimeStart(Value * Ptr,ConstantInt * Size)125 CallInst *IRBuilderBase::CreateLifetimeStart(Value *Ptr, ConstantInt *Size) {
126 assert(isa<PointerType>(Ptr->getType()) &&
127 "lifetime.start only applies to pointers.");
128 Ptr = getCastedInt8PtrValue(Ptr);
129 if (!Size)
130 Size = getInt64(-1);
131 else
132 assert(Size->getType() == getInt64Ty() &&
133 "lifetime.start requires the size to be an i64");
134 Value *Ops[] = { Size, Ptr };
135 Module *M = BB->getParent()->getParent();
136 Value *TheFn = Intrinsic::getDeclaration(M, Intrinsic::lifetime_start);
137 return createCallHelper(TheFn, Ops, this);
138 }
139
CreateLifetimeEnd(Value * Ptr,ConstantInt * Size)140 CallInst *IRBuilderBase::CreateLifetimeEnd(Value *Ptr, ConstantInt *Size) {
141 assert(isa<PointerType>(Ptr->getType()) &&
142 "lifetime.end only applies to pointers.");
143 Ptr = getCastedInt8PtrValue(Ptr);
144 if (!Size)
145 Size = getInt64(-1);
146 else
147 assert(Size->getType() == getInt64Ty() &&
148 "lifetime.end requires the size to be an i64");
149 Value *Ops[] = { Size, Ptr };
150 Module *M = BB->getParent()->getParent();
151 Value *TheFn = Intrinsic::getDeclaration(M, Intrinsic::lifetime_end);
152 return createCallHelper(TheFn, Ops, this);
153 }
154