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llvm-mirror/lib/Transforms/Utils/BuildLibCalls.cpp
Sanjay Patel 2932dde796 fix formatting; NFC 
llvm-svn: 258167
2016-01-19 19:17:47 +00:00

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//===- BuildLibCalls.cpp - Utility builder for libcalls -------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements some functions that will create standard C libcalls.
//
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/Utils/BuildLibCalls.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Type.h"
using namespace llvm;
Value *llvm::CastToCStr(Value *V, IRBuilder<> &B) {
unsigned AS = V->getType()->getPointerAddressSpace();
return B.CreateBitCast(V, B.getInt8PtrTy(AS), "cstr");
}
Value *llvm::EmitStrLen(Value *Ptr, IRBuilder<> &B, const DataLayout &DL,
const TargetLibraryInfo *TLI) {
if (!TLI->has(LibFunc::strlen))
return nullptr;
Module *M = B.GetInsertBlock()->getParent()->getParent();
AttributeSet AS[2];
AS[0] = AttributeSet::get(M->getContext(), 1, Attribute::NoCapture);
Attribute::AttrKind AVs[2] = { Attribute::ReadOnly, Attribute::NoUnwind };
AS[1] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, AVs);
LLVMContext &Context = B.GetInsertBlock()->getContext();
Constant *StrLen = M->getOrInsertFunction(
"strlen", AttributeSet::get(M->getContext(), AS),
DL.getIntPtrType(Context), B.getInt8PtrTy(), nullptr);
CallInst *CI = B.CreateCall(StrLen, CastToCStr(Ptr, B), "strlen");
if (const Function *F = dyn_cast<Function>(StrLen->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
}
Value *llvm::EmitStrChr(Value *Ptr, char C, IRBuilder<> &B,
const TargetLibraryInfo *TLI) {
if (!TLI->has(LibFunc::strchr))
return nullptr;
Module *M = B.GetInsertBlock()->getParent()->getParent();
Attribute::AttrKind AVs[2] = { Attribute::ReadOnly, Attribute::NoUnwind };
AttributeSet AS =
AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, AVs);
Type *I8Ptr = B.getInt8PtrTy();
Type *I32Ty = B.getInt32Ty();
Constant *StrChr = M->getOrInsertFunction("strchr",
AttributeSet::get(M->getContext(),
AS),
I8Ptr, I8Ptr, I32Ty, nullptr);
CallInst *CI = B.CreateCall(
StrChr, {CastToCStr(Ptr, B), ConstantInt::get(I32Ty, C)}, "strchr");
if (const Function *F = dyn_cast<Function>(StrChr->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
}
Value *llvm::EmitStrNCmp(Value *Ptr1, Value *Ptr2, Value *Len, IRBuilder<> &B,
const DataLayout &DL, const TargetLibraryInfo *TLI) {
if (!TLI->has(LibFunc::strncmp))
return nullptr;
Module *M = B.GetInsertBlock()->getParent()->getParent();
AttributeSet AS[3];
AS[0] = AttributeSet::get(M->getContext(), 1, Attribute::NoCapture);
AS[1] = AttributeSet::get(M->getContext(), 2, Attribute::NoCapture);
Attribute::AttrKind AVs[2] = { Attribute::ReadOnly, Attribute::NoUnwind };
AS[2] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, AVs);
LLVMContext &Context = B.GetInsertBlock()->getContext();
Value *StrNCmp = M->getOrInsertFunction(
"strncmp", AttributeSet::get(M->getContext(), AS), B.getInt32Ty(),
B.getInt8PtrTy(), B.getInt8PtrTy(), DL.getIntPtrType(Context), nullptr);
CallInst *CI = B.CreateCall(
StrNCmp, {CastToCStr(Ptr1, B), CastToCStr(Ptr2, B), Len}, "strncmp");
if (const Function *F = dyn_cast<Function>(StrNCmp->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
}
Value *llvm::EmitStrCpy(Value *Dst, Value *Src, IRBuilder<> &B,
const TargetLibraryInfo *TLI, StringRef Name) {
if (!TLI->has(LibFunc::strcpy))
return nullptr;
Module *M = B.GetInsertBlock()->getParent()->getParent();
AttributeSet AS[2];
AS[0] = AttributeSet::get(M->getContext(), 2, Attribute::NoCapture);
AS[1] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex,
Attribute::NoUnwind);
Type *I8Ptr = B.getInt8PtrTy();
Value *StrCpy = M->getOrInsertFunction(Name,
AttributeSet::get(M->getContext(), AS),
I8Ptr, I8Ptr, I8Ptr, nullptr);
CallInst *CI =
B.CreateCall(StrCpy, {CastToCStr(Dst, B), CastToCStr(Src, B)}, Name);
if (const Function *F = dyn_cast<Function>(StrCpy->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
}
Value *llvm::EmitStrNCpy(Value *Dst, Value *Src, Value *Len, IRBuilder<> &B,
const TargetLibraryInfo *TLI, StringRef Name) {
if (!TLI->has(LibFunc::strncpy))
return nullptr;
Module *M = B.GetInsertBlock()->getParent()->getParent();
AttributeSet AS[2];
AS[0] = AttributeSet::get(M->getContext(), 2, Attribute::NoCapture);
AS[1] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex,
Attribute::NoUnwind);
Type *I8Ptr = B.getInt8PtrTy();
Value *StrNCpy = M->getOrInsertFunction(Name,
AttributeSet::get(M->getContext(),
AS),
I8Ptr, I8Ptr, I8Ptr,
Len->getType(), nullptr);
CallInst *CI = B.CreateCall(
StrNCpy, {CastToCStr(Dst, B), CastToCStr(Src, B), Len}, "strncpy");
if (const Function *F = dyn_cast<Function>(StrNCpy->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
}
Value *llvm::EmitMemCpyChk(Value *Dst, Value *Src, Value *Len, Value *ObjSize,
IRBuilder<> &B, const DataLayout &DL,
const TargetLibraryInfo *TLI) {
if (!TLI->has(LibFunc::memcpy_chk))
return nullptr;
Module *M = B.GetInsertBlock()->getParent()->getParent();
AttributeSet AS;
AS = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex,
Attribute::NoUnwind);
LLVMContext &Context = B.GetInsertBlock()->getContext();
Value *MemCpy = M->getOrInsertFunction(
"__memcpy_chk", AttributeSet::get(M->getContext(), AS), B.getInt8PtrTy(),
B.getInt8PtrTy(), B.getInt8PtrTy(), DL.getIntPtrType(Context),
DL.getIntPtrType(Context), nullptr);
Dst = CastToCStr(Dst, B);
Src = CastToCStr(Src, B);
CallInst *CI = B.CreateCall(MemCpy, {Dst, Src, Len, ObjSize});
if (const Function *F = dyn_cast<Function>(MemCpy->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
}
Value *llvm::EmitMemChr(Value *Ptr, Value *Val, Value *Len, IRBuilder<> &B,
const DataLayout &DL, const TargetLibraryInfo *TLI) {
if (!TLI->has(LibFunc::memchr))
return nullptr;
Module *M = B.GetInsertBlock()->getParent()->getParent();
AttributeSet AS;
Attribute::AttrKind AVs[2] = { Attribute::ReadOnly, Attribute::NoUnwind };
AS = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, AVs);
LLVMContext &Context = B.GetInsertBlock()->getContext();
Value *MemChr = M->getOrInsertFunction(
"memchr", AttributeSet::get(M->getContext(), AS), B.getInt8PtrTy(),
B.getInt8PtrTy(), B.getInt32Ty(), DL.getIntPtrType(Context), nullptr);
CallInst *CI = B.CreateCall(MemChr, {CastToCStr(Ptr, B), Val, Len}, "memchr");
if (const Function *F = dyn_cast<Function>(MemChr->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
}
Value *llvm::EmitMemCmp(Value *Ptr1, Value *Ptr2, Value *Len, IRBuilder<> &B,
const DataLayout &DL, const TargetLibraryInfo *TLI) {
if (!TLI->has(LibFunc::memcmp))
return nullptr;
Module *M = B.GetInsertBlock()->getParent()->getParent();
AttributeSet AS[3];
AS[0] = AttributeSet::get(M->getContext(), 1, Attribute::NoCapture);
AS[1] = AttributeSet::get(M->getContext(), 2, Attribute::NoCapture);
Attribute::AttrKind AVs[2] = { Attribute::ReadOnly, Attribute::NoUnwind };
AS[2] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex, AVs);
LLVMContext &Context = B.GetInsertBlock()->getContext();
Value *MemCmp = M->getOrInsertFunction(
"memcmp", AttributeSet::get(M->getContext(), AS), B.getInt32Ty(),
B.getInt8PtrTy(), B.getInt8PtrTy(), DL.getIntPtrType(Context), nullptr);
CallInst *CI = B.CreateCall(
MemCmp, {CastToCStr(Ptr1, B), CastToCStr(Ptr2, B), Len}, "memcmp");
if (const Function *F = dyn_cast<Function>(MemCmp->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
}
/// Append a suffix to the function name according to the type of 'Op'.
static void AppendTypeSuffix(Value *Op, StringRef &Name,
SmallString<20> &NameBuffer) {
if (!Op->getType()->isDoubleTy()) {
NameBuffer += Name;
if (Op->getType()->isFloatTy())
NameBuffer += 'f';
else
NameBuffer += 'l';
Name = NameBuffer;
}
return;
}
Value *llvm::EmitUnaryFloatFnCall(Value *Op, StringRef Name, IRBuilder<> &B,
const AttributeSet &Attrs) {
SmallString<20> NameBuffer;
AppendTypeSuffix(Op, Name, NameBuffer);
Module *M = B.GetInsertBlock()->getParent()->getParent();
Value *Callee = M->getOrInsertFunction(Name, Op->getType(),
Op->getType(), nullptr);
CallInst *CI = B.CreateCall(Callee, Op, Name);
CI->setAttributes(Attrs);
if (const Function *F = dyn_cast<Function>(Callee->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
}
Value *llvm::EmitBinaryFloatFnCall(Value *Op1, Value *Op2, StringRef Name,
IRBuilder<> &B, const AttributeSet &Attrs) {
SmallString<20> NameBuffer;
AppendTypeSuffix(Op1, Name, NameBuffer);
Module *M = B.GetInsertBlock()->getParent()->getParent();
Value *Callee = M->getOrInsertFunction(Name, Op1->getType(), Op1->getType(),
Op2->getType(), nullptr);
CallInst *CI = B.CreateCall(Callee, {Op1, Op2}, Name);
CI->setAttributes(Attrs);
if (const Function *F = dyn_cast<Function>(Callee->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
}
Value *llvm::EmitPutChar(Value *Char, IRBuilder<> &B,
const TargetLibraryInfo *TLI) {
if (!TLI->has(LibFunc::putchar))
return nullptr;
Module *M = B.GetInsertBlock()->getParent()->getParent();
Value *PutChar = M->getOrInsertFunction("putchar", B.getInt32Ty(),
B.getInt32Ty(), nullptr);
CallInst *CI = B.CreateCall(PutChar,
B.CreateIntCast(Char,
B.getInt32Ty(),
/*isSigned*/true,
"chari"),
"putchar");
if (const Function *F = dyn_cast<Function>(PutChar->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
}
Value *llvm::EmitPutS(Value *Str, IRBuilder<> &B,
const TargetLibraryInfo *TLI) {
if (!TLI->has(LibFunc::puts))
return nullptr;
Module *M = B.GetInsertBlock()->getParent()->getParent();
AttributeSet AS[2];
AS[0] = AttributeSet::get(M->getContext(), 1, Attribute::NoCapture);
AS[1] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex,
Attribute::NoUnwind);
Value *PutS = M->getOrInsertFunction("puts",
AttributeSet::get(M->getContext(), AS),
B.getInt32Ty(),
B.getInt8PtrTy(),
nullptr);
CallInst *CI = B.CreateCall(PutS, CastToCStr(Str, B), "puts");
if (const Function *F = dyn_cast<Function>(PutS->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
}
Value *llvm::EmitFPutC(Value *Char, Value *File, IRBuilder<> &B,
const TargetLibraryInfo *TLI) {
if (!TLI->has(LibFunc::fputc))
return nullptr;
Module *M = B.GetInsertBlock()->getParent()->getParent();
AttributeSet AS[2];
AS[0] = AttributeSet::get(M->getContext(), 2, Attribute::NoCapture);
AS[1] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex,
Attribute::NoUnwind);
Constant *F;
if (File->getType()->isPointerTy())
F = M->getOrInsertFunction("fputc",
AttributeSet::get(M->getContext(), AS),
B.getInt32Ty(),
B.getInt32Ty(), File->getType(),
nullptr);
else
F = M->getOrInsertFunction("fputc",
B.getInt32Ty(),
B.getInt32Ty(),
File->getType(), nullptr);
Char = B.CreateIntCast(Char, B.getInt32Ty(), /*isSigned*/true,
"chari");
CallInst *CI = B.CreateCall(F, {Char, File}, "fputc");
if (const Function *Fn = dyn_cast<Function>(F->stripPointerCasts()))
CI->setCallingConv(Fn->getCallingConv());
return CI;
}
Value *llvm::EmitFPutS(Value *Str, Value *File, IRBuilder<> &B,
const TargetLibraryInfo *TLI) {
if (!TLI->has(LibFunc::fputs))
return nullptr;
Module *M = B.GetInsertBlock()->getParent()->getParent();
AttributeSet AS[3];
AS[0] = AttributeSet::get(M->getContext(), 1, Attribute::NoCapture);
AS[1] = AttributeSet::get(M->getContext(), 2, Attribute::NoCapture);
AS[2] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex,
Attribute::NoUnwind);
StringRef FPutsName = TLI->getName(LibFunc::fputs);
Constant *F;
if (File->getType()->isPointerTy())
F = M->getOrInsertFunction(FPutsName,
AttributeSet::get(M->getContext(), AS),
B.getInt32Ty(),
B.getInt8PtrTy(),
File->getType(), nullptr);
else
F = M->getOrInsertFunction(FPutsName, B.getInt32Ty(),
B.getInt8PtrTy(),
File->getType(), nullptr);
CallInst *CI = B.CreateCall(F, {CastToCStr(Str, B), File}, "fputs");
if (const Function *Fn = dyn_cast<Function>(F->stripPointerCasts()))
CI->setCallingConv(Fn->getCallingConv());
return CI;
}
Value *llvm::EmitFWrite(Value *Ptr, Value *Size, Value *File, IRBuilder<> &B,
const DataLayout &DL, const TargetLibraryInfo *TLI) {
if (!TLI->has(LibFunc::fwrite))
return nullptr;
Module *M = B.GetInsertBlock()->getParent()->getParent();
AttributeSet AS[3];
AS[0] = AttributeSet::get(M->getContext(), 1, Attribute::NoCapture);
AS[1] = AttributeSet::get(M->getContext(), 4, Attribute::NoCapture);
AS[2] = AttributeSet::get(M->getContext(), AttributeSet::FunctionIndex,
Attribute::NoUnwind);
LLVMContext &Context = B.GetInsertBlock()->getContext();
StringRef FWriteName = TLI->getName(LibFunc::fwrite);
Constant *F;
if (File->getType()->isPointerTy())
F = M->getOrInsertFunction(
FWriteName, AttributeSet::get(M->getContext(), AS),
DL.getIntPtrType(Context), B.getInt8PtrTy(), DL.getIntPtrType(Context),
DL.getIntPtrType(Context), File->getType(), nullptr);
else
F = M->getOrInsertFunction(FWriteName, DL.getIntPtrType(Context),
B.getInt8PtrTy(), DL.getIntPtrType(Context),
DL.getIntPtrType(Context), File->getType(),
nullptr);
CallInst *CI =
B.CreateCall(F, {CastToCStr(Ptr, B), Size,
ConstantInt::get(DL.getIntPtrType(Context), 1), File});
if (const Function *Fn = dyn_cast<Function>(F->stripPointerCasts()))
CI->setCallingConv(Fn->getCallingConv());
return CI;
}
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