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llvm-project/llvm/lib/Transforms/Utils/BuildLibCalls.cpp

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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/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"
#include "llvm/Analysis/TargetLibraryInfo.h"
using namespace llvm;
/// CastToCStr - Return V if it is an i8*, otherwise cast it to i8*.
Value *llvm::CastToCStr(Value *V, IRBuilder<> &B) {
unsigned AS = V->getType()->getPointerAddressSpace();
return B.CreateBitCast(V, B.getInt8PtrTy(AS), "cstr");
}
/// EmitStrLen - Emit a call to the strlen function to the builder, for the
/// specified pointer. This always returns an integer value of size intptr_t.
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;
}
/// EmitStrNLen - Emit a call to the strnlen function to the builder, for the
/// specified pointer. Ptr is required to be some pointer type, MaxLen must
/// be of size_t type, and the return value has 'intptr_t' type.
Value *llvm::EmitStrNLen(Value *Ptr, Value *MaxLen, IRBuilder<> &B,
const DataLayout &DL, const TargetLibraryInfo *TLI) {
if (!TLI->has(LibFunc::strnlen))
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 *StrNLen =
M->getOrInsertFunction("strnlen", AttributeSet::get(M->getContext(), AS),
DL.getIntPtrType(Context), B.getInt8PtrTy(),
DL.getIntPtrType(Context), nullptr);
CallInst *CI = B.CreateCall2(StrNLen, CastToCStr(Ptr, B), MaxLen, "strnlen");
if (const Function *F = dyn_cast<Function>(StrNLen->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
}
/// EmitStrChr - Emit a call to the strchr function to the builder, for the
/// specified pointer and character. Ptr is required to be some pointer type,
/// and the return value has 'i8*' type.
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.CreateCall2(StrChr, CastToCStr(Ptr, B),
ConstantInt::get(I32Ty, C), "strchr");
if (const Function *F = dyn_cast<Function>(StrChr->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
}
/// EmitStrNCmp - Emit a call to the strncmp function to the builder.
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.CreateCall3(StrNCmp, CastToCStr(Ptr1, B),
CastToCStr(Ptr2, B), Len, "strncmp");
if (const Function *F = dyn_cast<Function>(StrNCmp->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
}
/// EmitStrCpy - Emit a call to the strcpy function to the builder, for the
/// specified pointer arguments.
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.CreateCall2(StrCpy, CastToCStr(Dst, B), CastToCStr(Src, B),
Name);
if (const Function *F = dyn_cast<Function>(StrCpy->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
}
/// EmitStrNCpy - Emit a call to the strncpy function to the builder, for the
/// specified pointer arguments.
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.CreateCall3(StrNCpy, CastToCStr(Dst, B), CastToCStr(Src, B),
Len, "strncpy");
if (const Function *F = dyn_cast<Function>(StrNCpy->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
}
/// EmitMemCpyChk - Emit a call to the __memcpy_chk function to the builder.
/// This expects that the Len and ObjSize have type 'intptr_t' and Dst/Src
/// are pointers.
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.CreateCall4(MemCpy, Dst, Src, Len, ObjSize);
if (const Function *F = dyn_cast<Function>(MemCpy->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
}
/// EmitMemChr - Emit a call to the memchr function. This assumes that Ptr is
/// a pointer, Val is an i32 value, and Len is an 'intptr_t' value.
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.CreateCall3(MemChr, CastToCStr(Ptr, B), Val, Len, "memchr");
if (const Function *F = dyn_cast<Function>(MemChr->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
}
/// EmitMemCmp - Emit a call to the memcmp function.
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.CreateCall3(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;
}
/// EmitUnaryFloatFnCall - Emit a call to the unary function named 'Name' (e.g.
/// 'floor'). This function is known to take a single of type matching 'Op' and
/// returns one value with the same type. If 'Op' is a long double, 'l' is
/// added as the suffix of name, if 'Op' is a float, we add a 'f' suffix.
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;
}
/// EmitBinaryFloatFnCall - Emit a call to the binary function named 'Name'
/// (e.g. 'fmin'). This function is known to take type matching 'Op1' and 'Op2'
/// and return one value with the same type. If 'Op1/Op2' are long double, 'l'
/// is added as the suffix of name, if 'Op1/Op2' is a float, we add a 'f'
/// suffix.
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.CreateCall2(Callee, Op1, Op2, Name);
CI->setAttributes(Attrs);
if (const Function *F = dyn_cast<Function>(Callee->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
}
/// EmitPutChar - Emit a call to the putchar function. This assumes that Char
/// is an integer.
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;
}
/// EmitPutS - Emit a call to the puts function. This assumes that Str is
/// some pointer.
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;
}
/// EmitFPutC - Emit a call to the fputc function. This assumes that Char is
/// an integer and File is a pointer to FILE.
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.CreateCall2(F, Char, File, "fputc");
if (const Function *Fn = dyn_cast<Function>(F->stripPointerCasts()))
CI->setCallingConv(Fn->getCallingConv());
return CI;
}
/// EmitFPutS - Emit a call to the puts function. Str is required to be a
/// pointer and File is a pointer to FILE.
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.CreateCall2(F, CastToCStr(Str, B), File, "fputs");
if (const Function *Fn = dyn_cast<Function>(F->stripPointerCasts()))
CI->setCallingConv(Fn->getCallingConv());
return CI;
}
/// EmitFWrite - Emit a call to the fwrite function. This assumes that Ptr is
/// a pointer, Size is an 'intptr_t', and File is a pointer to FILE.
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.CreateCall4(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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