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llvm/lib/Transforms/Utils/BuildLibCalls.cpp
Eric Christopher b6174e3605 Move SimplifyLibCalls's LibCall builders to a separate file so they 
can be used in more places.  Add an argument for the TargetData that
most of them need. Update for the getInt8PtrTy() change.  Should be
no functionality change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97844 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-05 22:25:30 +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/Type.h"
#include "llvm/Constants.h"
#include "llvm/Function.h"
#include "llvm/Module.h"
#include "llvm/Support/IRBuilder.h"
#include "llvm/Target/TargetData.h"
#include "llvm/LLVMContext.h"
#include "llvm/Intrinsics.h"
using namespace llvm;
/// CastToCStr - Return V if it is an i8*, otherwise cast it to i8*.
Value *llvm::CastToCStr(Value *V, IRBuilder<> &B) {
return B.CreateBitCast(V, B.getInt8PtrTy(), "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 TargetData *TD) {
Module *M = B.GetInsertBlock()->getParent()->getParent();
AttributeWithIndex AWI[2];
AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture);
AWI[1] = AttributeWithIndex::get(~0u, Attribute::ReadOnly |
Attribute::NoUnwind);
LLVMContext &Context = B.GetInsertBlock()->getContext();
Constant *StrLen = M->getOrInsertFunction("strlen", AttrListPtr::get(AWI, 2),
TD->getIntPtrType(Context),
B.getInt8PtrTy(),
NULL);
CallInst *CI = B.CreateCall(StrLen, CastToCStr(Ptr, B), "strlen");
if (const Function *F = dyn_cast<Function>(StrLen->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 TargetData *TD) {
Module *M = B.GetInsertBlock()->getParent()->getParent();
AttributeWithIndex AWI =
AttributeWithIndex::get(~0u, Attribute::ReadOnly | Attribute::NoUnwind);
const Type *I8Ptr = B.getInt8PtrTy();
const Type *I32Ty = B.getInt32Ty();
Constant *StrChr = M->getOrInsertFunction("strchr", AttrListPtr::get(&AWI, 1),
I8Ptr, I8Ptr, I32Ty, NULL);
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;
}
/// 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 TargetData *TD) {
Module *M = B.GetInsertBlock()->getParent()->getParent();
AttributeWithIndex AWI[2];
AWI[0] = AttributeWithIndex::get(2, Attribute::NoCapture);
AWI[1] = AttributeWithIndex::get(~0u, Attribute::NoUnwind);
const Type *I8Ptr = B.getInt8PtrTy();
Value *StrCpy = M->getOrInsertFunction("strcpy", AttrListPtr::get(AWI, 2),
I8Ptr, I8Ptr, I8Ptr, NULL);
CallInst *CI = B.CreateCall2(StrCpy, CastToCStr(Dst, B), CastToCStr(Src, B),
"strcpy");
if (const Function *F = dyn_cast<Function>(StrCpy->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
}
/// EmitMemCpy - Emit a call to the memcpy function to the builder. This always
/// expects that the size has type 'intptr_t' and Dst/Src are pointers.
Value *llvm::EmitMemCpy(Value *Dst, Value *Src, Value *Len,
unsigned Align, IRBuilder<> &B, const TargetData *TD) {
Module *M = B.GetInsertBlock()->getParent()->getParent();
const Type *Ty = Len->getType();
Value *MemCpy = Intrinsic::getDeclaration(M, Intrinsic::memcpy, &Ty, 1);
Dst = CastToCStr(Dst, B);
Src = CastToCStr(Src, B);
return B.CreateCall4(MemCpy, Dst, Src, Len,
ConstantInt::get(B.getInt32Ty(), Align));
}
/// EmitMemMove - Emit a call to the memmove function to the builder. This
/// always expects that the size has type 'intptr_t' and Dst/Src are pointers.
Value *llvm::EmitMemMove(Value *Dst, Value *Src, Value *Len,
unsigned Align, IRBuilder<> &B, const TargetData *TD) {
Module *M = B.GetInsertBlock()->getParent()->getParent();
LLVMContext &Context = B.GetInsertBlock()->getContext();
const Type *Ty = TD->getIntPtrType(Context);
Value *MemMove = Intrinsic::getDeclaration(M, Intrinsic::memmove, &Ty, 1);
Dst = CastToCStr(Dst, B);
Src = CastToCStr(Src, B);
Value *A = ConstantInt::get(B.getInt32Ty(), Align);
return B.CreateCall4(MemMove, Dst, Src, Len, A);
}
/// 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 TargetData *TD) {
Module *M = B.GetInsertBlock()->getParent()->getParent();
AttributeWithIndex AWI;
AWI = AttributeWithIndex::get(~0u, Attribute::ReadOnly | Attribute::NoUnwind);
LLVMContext &Context = B.GetInsertBlock()->getContext();
Value *MemChr = M->getOrInsertFunction("memchr", AttrListPtr::get(&AWI, 1),
B.getInt8PtrTy(),
B.getInt8PtrTy(),
B.getInt32Ty(),
TD->getIntPtrType(Context),
NULL);
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 TargetData *TD) {
Module *M = B.GetInsertBlock()->getParent()->getParent();
AttributeWithIndex AWI[3];
AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture);
AWI[1] = AttributeWithIndex::get(2, Attribute::NoCapture);
AWI[2] = AttributeWithIndex::get(~0u, Attribute::ReadOnly |
Attribute::NoUnwind);
LLVMContext &Context = B.GetInsertBlock()->getContext();
Value *MemCmp = M->getOrInsertFunction("memcmp", AttrListPtr::get(AWI, 3),
B.getInt32Ty(),
B.getInt8PtrTy(),
B.getInt8PtrTy(),
TD->getIntPtrType(Context), NULL);
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;
}
/// EmitMemSet - Emit a call to the memset function
Value *llvm::EmitMemSet(Value *Dst, Value *Val,
Value *Len, IRBuilder<> &B, const TargetData *TD) {
Module *M = B.GetInsertBlock()->getParent()->getParent();
Intrinsic::ID IID = Intrinsic::memset;
const Type *Tys[1];
Tys[0] = Len->getType();
Value *MemSet = Intrinsic::getDeclaration(M, IID, Tys, 1);
Value *Align = ConstantInt::get(B.getInt32Ty(), 1);
return B.CreateCall4(MemSet, CastToCStr(Dst, B), Val, Len, Align);
}
/// 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, const char *Name,
IRBuilder<> &B, const AttrListPtr &Attrs) {
char NameBuffer[20];
if (!Op->getType()->isDoubleTy()) {
// If we need to add a suffix, copy into NameBuffer.
unsigned NameLen = strlen(Name);
assert(NameLen < sizeof(NameBuffer)-2);
memcpy(NameBuffer, Name, NameLen);
if (Op->getType()->isFloatTy())
NameBuffer[NameLen] = 'f'; // floorf
else
NameBuffer[NameLen] = 'l'; // floorl
NameBuffer[NameLen+1] = 0;
Name = NameBuffer;
}
Module *M = B.GetInsertBlock()->getParent()->getParent();
Value *Callee = M->getOrInsertFunction(Name, Op->getType(),
Op->getType(), NULL);
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;
}
/// EmitPutChar - Emit a call to the putchar function. This assumes that Char
/// is an integer.
Value *llvm::EmitPutChar(Value *Char, IRBuilder<> &B, const TargetData *TD) {
Module *M = B.GetInsertBlock()->getParent()->getParent();
Value *PutChar = M->getOrInsertFunction("putchar", B.getInt32Ty(),
B.getInt32Ty(), NULL);
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.
void llvm::EmitPutS(Value *Str, IRBuilder<> &B, const TargetData *TD) {
Module *M = B.GetInsertBlock()->getParent()->getParent();
AttributeWithIndex AWI[2];
AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture);
AWI[1] = AttributeWithIndex::get(~0u, Attribute::NoUnwind);
Value *PutS = M->getOrInsertFunction("puts", AttrListPtr::get(AWI, 2),
B.getInt32Ty(),
B.getInt8PtrTy(),
NULL);
CallInst *CI = B.CreateCall(PutS, CastToCStr(Str, B), "puts");
if (const Function *F = dyn_cast<Function>(PutS->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
}
/// EmitFPutC - Emit a call to the fputc function. This assumes that Char is
/// an integer and File is a pointer to FILE.
void llvm::EmitFPutC(Value *Char, Value *File, IRBuilder<> &B,
const TargetData *TD) {
Module *M = B.GetInsertBlock()->getParent()->getParent();
AttributeWithIndex AWI[2];
AWI[0] = AttributeWithIndex::get(2, Attribute::NoCapture);
AWI[1] = AttributeWithIndex::get(~0u, Attribute::NoUnwind);
Constant *F;
if (File->getType()->isPointerTy())
F = M->getOrInsertFunction("fputc", AttrListPtr::get(AWI, 2),
B.getInt32Ty(),
B.getInt32Ty(), File->getType(),
NULL);
else
F = M->getOrInsertFunction("fputc",
B.getInt32Ty(),
B.getInt32Ty(),
File->getType(), NULL);
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());
}
/// EmitFPutS - Emit a call to the puts function. Str is required to be a
/// pointer and File is a pointer to FILE.
void llvm::EmitFPutS(Value *Str, Value *File, IRBuilder<> &B,
const TargetData *TD) {
Module *M = B.GetInsertBlock()->getParent()->getParent();
AttributeWithIndex AWI[3];
AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture);
AWI[1] = AttributeWithIndex::get(2, Attribute::NoCapture);
AWI[2] = AttributeWithIndex::get(~0u, Attribute::NoUnwind);
Constant *F;
if (File->getType()->isPointerTy())
F = M->getOrInsertFunction("fputs", AttrListPtr::get(AWI, 3),
B.getInt32Ty(),
B.getInt8PtrTy(),
File->getType(), NULL);
else
F = M->getOrInsertFunction("fputs", B.getInt32Ty(),
B.getInt8PtrTy(),
File->getType(), NULL);
CallInst *CI = B.CreateCall2(F, CastToCStr(Str, B), File, "fputs");
if (const Function *Fn = dyn_cast<Function>(F->stripPointerCasts()))
CI->setCallingConv(Fn->getCallingConv());
}
/// 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.
void llvm::EmitFWrite(Value *Ptr, Value *Size, Value *File,
IRBuilder<> &B, const TargetData *TD) {
Module *M = B.GetInsertBlock()->getParent()->getParent();
AttributeWithIndex AWI[3];
AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture);
AWI[1] = AttributeWithIndex::get(4, Attribute::NoCapture);
AWI[2] = AttributeWithIndex::get(~0u, Attribute::NoUnwind);
LLVMContext &Context = B.GetInsertBlock()->getContext();
Constant *F;
if (File->getType()->isPointerTy())
F = M->getOrInsertFunction("fwrite", AttrListPtr::get(AWI, 3),
TD->getIntPtrType(Context),
B.getInt8PtrTy(),
TD->getIntPtrType(Context),
TD->getIntPtrType(Context),
File->getType(), NULL);
else
F = M->getOrInsertFunction("fwrite", TD->getIntPtrType(Context),
B.getInt8PtrTy(),
TD->getIntPtrType(Context),
TD->getIntPtrType(Context),
File->getType(), NULL);
CallInst *CI = B.CreateCall4(F, CastToCStr(Ptr, B), Size,
ConstantInt::get(TD->getIntPtrType(Context), 1), File);
if (const Function *Fn = dyn_cast<Function>(F->stripPointerCasts()))
CI->setCallingConv(Fn->getCallingConv());
}
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