| //===- 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); |
| |
| Type *I8Ptr = B.getInt8PtrTy(); |
| 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; |
| } |
| |
| /// EmitStrNCmp - Emit a call to the strncmp function to the builder. |
| Value *llvm::EmitStrNCmp(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 *StrNCmp = M->getOrInsertFunction("strncmp", AttrListPtr::get(AWI, 3), |
| B.getInt32Ty(), |
| B.getInt8PtrTy(), |
| B.getInt8PtrTy(), |
| TD->getIntPtrType(Context), NULL); |
| 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 TargetData *TD, StringRef Name) { |
| Module *M = B.GetInsertBlock()->getParent()->getParent(); |
| AttributeWithIndex AWI[2]; |
| AWI[0] = AttributeWithIndex::get(2, Attribute::NoCapture); |
| AWI[1] = AttributeWithIndex::get(~0u, Attribute::NoUnwind); |
| Type *I8Ptr = B.getInt8PtrTy(); |
| Value *StrCpy = M->getOrInsertFunction(Name, AttrListPtr::get(AWI, 2), |
| I8Ptr, I8Ptr, I8Ptr, NULL); |
| 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 TargetData *TD, StringRef Name) { |
| Module *M = B.GetInsertBlock()->getParent()->getParent(); |
| AttributeWithIndex AWI[2]; |
| AWI[0] = AttributeWithIndex::get(2, Attribute::NoCapture); |
| AWI[1] = AttributeWithIndex::get(~0u, Attribute::NoUnwind); |
| Type *I8Ptr = B.getInt8PtrTy(); |
| Value *StrNCpy = M->getOrInsertFunction(Name, AttrListPtr::get(AWI, 2), |
| I8Ptr, I8Ptr, I8Ptr, |
| Len->getType(), NULL); |
| 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 TargetData *TD) { |
| Module *M = B.GetInsertBlock()->getParent()->getParent(); |
| AttributeWithIndex AWI; |
| AWI = AttributeWithIndex::get(~0u, Attribute::NoUnwind); |
| LLVMContext &Context = B.GetInsertBlock()->getContext(); |
| Value *MemCpy = M->getOrInsertFunction("__memcpy_chk", |
| AttrListPtr::get(&AWI, 1), |
| B.getInt8PtrTy(), |
| B.getInt8PtrTy(), |
| B.getInt8PtrTy(), |
| TD->getIntPtrType(Context), |
| TD->getIntPtrType(Context), NULL); |
| 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 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; |
| } |
| |
| /// 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()); |
| } |
| |
| SimplifyFortifiedLibCalls::~SimplifyFortifiedLibCalls() { } |
| |
| bool SimplifyFortifiedLibCalls::fold(CallInst *CI, const TargetData *TD) { |
| // We really need TargetData for later. |
| if (!TD) return false; |
| |
| this->CI = CI; |
| Function *Callee = CI->getCalledFunction(); |
| StringRef Name = Callee->getName(); |
| FunctionType *FT = Callee->getFunctionType(); |
| LLVMContext &Context = CI->getParent()->getContext(); |
| IRBuilder<> B(CI); |
| |
| if (Name == "__memcpy_chk") { |
| // Check if this has the right signature. |
| if (FT->getNumParams() != 4 || FT->getReturnType() != FT->getParamType(0) || |
| !FT->getParamType(0)->isPointerTy() || |
| !FT->getParamType(1)->isPointerTy() || |
| FT->getParamType(2) != TD->getIntPtrType(Context) || |
| FT->getParamType(3) != TD->getIntPtrType(Context)) |
| return false; |
| |
| if (isFoldable(3, 2, false)) { |
| B.CreateMemCpy(CI->getArgOperand(0), CI->getArgOperand(1), |
| CI->getArgOperand(2), 1); |
| replaceCall(CI->getArgOperand(0)); |
| return true; |
| } |
| return false; |
| } |
| |
| // Should be similar to memcpy. |
| if (Name == "__mempcpy_chk") { |
| return false; |
| } |
| |
| if (Name == "__memmove_chk") { |
| // Check if this has the right signature. |
| if (FT->getNumParams() != 4 || FT->getReturnType() != FT->getParamType(0) || |
| !FT->getParamType(0)->isPointerTy() || |
| !FT->getParamType(1)->isPointerTy() || |
| FT->getParamType(2) != TD->getIntPtrType(Context) || |
| FT->getParamType(3) != TD->getIntPtrType(Context)) |
| return false; |
| |
| if (isFoldable(3, 2, false)) { |
| B.CreateMemMove(CI->getArgOperand(0), CI->getArgOperand(1), |
| CI->getArgOperand(2), 1); |
| replaceCall(CI->getArgOperand(0)); |
| return true; |
| } |
| return false; |
| } |
| |
| if (Name == "__memset_chk") { |
| // Check if this has the right signature. |
| if (FT->getNumParams() != 4 || FT->getReturnType() != FT->getParamType(0) || |
| !FT->getParamType(0)->isPointerTy() || |
| !FT->getParamType(1)->isIntegerTy() || |
| FT->getParamType(2) != TD->getIntPtrType(Context) || |
| FT->getParamType(3) != TD->getIntPtrType(Context)) |
| return false; |
| |
| if (isFoldable(3, 2, false)) { |
| Value *Val = B.CreateIntCast(CI->getArgOperand(1), B.getInt8Ty(), |
| false); |
| B.CreateMemSet(CI->getArgOperand(0), Val, CI->getArgOperand(2), 1); |
| replaceCall(CI->getArgOperand(0)); |
| return true; |
| } |
| return false; |
| } |
| |
| if (Name == "__strcpy_chk" || Name == "__stpcpy_chk") { |
| // Check if this has the right signature. |
| if (FT->getNumParams() != 3 || |
| FT->getReturnType() != FT->getParamType(0) || |
| FT->getParamType(0) != FT->getParamType(1) || |
| FT->getParamType(0) != Type::getInt8PtrTy(Context) || |
| FT->getParamType(2) != TD->getIntPtrType(Context)) |
| return 0; |
| |
| |
| // If a) we don't have any length information, or b) we know this will |
| // fit then just lower to a plain st[rp]cpy. Otherwise we'll keep our |
| // st[rp]cpy_chk call which may fail at runtime if the size is too long. |
| // TODO: It might be nice to get a maximum length out of the possible |
| // string lengths for varying. |
| if (isFoldable(2, 1, true)) { |
| Value *Ret = EmitStrCpy(CI->getArgOperand(0), CI->getArgOperand(1), B, TD, |
| Name.substr(2, 6)); |
| replaceCall(Ret); |
| return true; |
| } |
| return false; |
| } |
| |
| if (Name == "__strncpy_chk" || Name == "__stpncpy_chk") { |
| // Check if this has the right signature. |
| if (FT->getNumParams() != 4 || FT->getReturnType() != FT->getParamType(0) || |
| FT->getParamType(0) != FT->getParamType(1) || |
| FT->getParamType(0) != Type::getInt8PtrTy(Context) || |
| !FT->getParamType(2)->isIntegerTy() || |
| FT->getParamType(3) != TD->getIntPtrType(Context)) |
| return false; |
| |
| if (isFoldable(3, 2, false)) { |
| Value *Ret = EmitStrNCpy(CI->getArgOperand(0), CI->getArgOperand(1), |
| CI->getArgOperand(2), B, TD, Name.substr(2, 7)); |
| replaceCall(Ret); |
| return true; |
| } |
| return false; |
| } |
| |
| if (Name == "__strcat_chk") { |
| return false; |
| } |
| |
| if (Name == "__strncat_chk") { |
| return false; |
| } |
| |
| return false; |
| } |
