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