forked from OSchip/llvm-project
627 lines
26 KiB
C++
627 lines
26 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/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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#include "llvm/Target/TargetLibraryInfo.h"
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using namespace llvm;
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/// CastToCStr - Return V if it is an i8*, otherwise cast it to i8*.
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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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/// EmitStrLen - Emit a call to the strlen function to the builder, for the
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/// specified pointer. This always returns an integer value of size intptr_t.
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Value *llvm::EmitStrLen(Value *Ptr, IRBuilder<> &B, const DataLayout *TD,
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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()->getParent()->getParent();
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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,
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ArrayRef<Attribute::AttrKind>(AVs, 2));
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LLVMContext &Context = B.GetInsertBlock()->getContext();
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Constant *StrLen = M->getOrInsertFunction("strlen",
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AttributeSet::get(M->getContext(),
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AS),
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TD->getIntPtrType(Context),
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B.getInt8PtrTy(),
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NULL);
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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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/// EmitStrNLen - Emit a call to the strnlen function to the builder, for the
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/// specified pointer. Ptr is required to be some pointer type, MaxLen must
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/// be of size_t type, and the return value has 'intptr_t' type.
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Value *llvm::EmitStrNLen(Value *Ptr, Value *MaxLen, IRBuilder<> &B,
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const DataLayout *TD, const TargetLibraryInfo *TLI) {
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if (!TLI->has(LibFunc::strnlen))
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return nullptr;
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Module *M = B.GetInsertBlock()->getParent()->getParent();
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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,
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ArrayRef<Attribute::AttrKind>(AVs, 2));
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LLVMContext &Context = B.GetInsertBlock()->getContext();
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Constant *StrNLen = M->getOrInsertFunction("strnlen",
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AttributeSet::get(M->getContext(),
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AS),
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TD->getIntPtrType(Context),
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B.getInt8PtrTy(),
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TD->getIntPtrType(Context),
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NULL);
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CallInst *CI = B.CreateCall2(StrNLen, CastToCStr(Ptr, B), MaxLen, "strnlen");
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if (const Function *F = dyn_cast<Function>(StrNLen->stripPointerCasts()))
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CI->setCallingConv(F->getCallingConv());
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return CI;
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}
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/// EmitStrChr - Emit a call to the strchr function to the builder, for the
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/// specified pointer and character. Ptr is required to be some pointer type,
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/// and the return value has 'i8*' type.
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Value *llvm::EmitStrChr(Value *Ptr, char C, IRBuilder<> &B,
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const DataLayout *TD, 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()->getParent()->getParent();
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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,
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ArrayRef<Attribute::AttrKind>(AVs, 2));
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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, NULL);
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CallInst *CI = B.CreateCall2(StrChr, CastToCStr(Ptr, B),
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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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/// EmitStrNCmp - Emit a call to the strncmp function to the builder.
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Value *llvm::EmitStrNCmp(Value *Ptr1, Value *Ptr2, Value *Len,
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IRBuilder<> &B, const DataLayout *TD,
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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()->getParent()->getParent();
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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,
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ArrayRef<Attribute::AttrKind>(AVs, 2));
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LLVMContext &Context = B.GetInsertBlock()->getContext();
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Value *StrNCmp = M->getOrInsertFunction("strncmp",
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AttributeSet::get(M->getContext(),
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AS),
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B.getInt32Ty(),
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B.getInt8PtrTy(),
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B.getInt8PtrTy(),
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TD->getIntPtrType(Context), NULL);
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CallInst *CI = B.CreateCall3(StrNCmp, CastToCStr(Ptr1, B),
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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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/// EmitStrCpy - Emit a call to the strcpy function to the builder, for the
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/// specified pointer arguments.
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Value *llvm::EmitStrCpy(Value *Dst, Value *Src, IRBuilder<> &B,
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const DataLayout *TD, const TargetLibraryInfo *TLI,
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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()->getParent()->getParent();
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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, NULL);
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CallInst *CI = B.CreateCall2(StrCpy, CastToCStr(Dst, B), CastToCStr(Src, B),
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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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/// EmitStrNCpy - Emit a call to the strncpy function to the builder, for the
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/// specified pointer arguments.
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Value *llvm::EmitStrNCpy(Value *Dst, Value *Src, Value *Len,
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IRBuilder<> &B, const DataLayout *TD,
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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()->getParent()->getParent();
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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(), NULL);
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CallInst *CI = B.CreateCall3(StrNCpy, CastToCStr(Dst, B), CastToCStr(Src, B),
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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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/// EmitMemCpyChk - Emit a call to the __memcpy_chk function to the builder.
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/// This expects that the Len and ObjSize have type 'intptr_t' and Dst/Src
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/// are pointers.
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Value *llvm::EmitMemCpyChk(Value *Dst, Value *Src, Value *Len, Value *ObjSize,
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IRBuilder<> &B, const DataLayout *TD,
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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()->getParent()->getParent();
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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("__memcpy_chk",
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AttributeSet::get(M->getContext(), AS),
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B.getInt8PtrTy(),
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B.getInt8PtrTy(),
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B.getInt8PtrTy(),
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TD->getIntPtrType(Context),
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TD->getIntPtrType(Context), NULL);
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Dst = CastToCStr(Dst, B);
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Src = CastToCStr(Src, B);
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CallInst *CI = B.CreateCall4(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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/// EmitMemChr - Emit a call to the memchr function. This assumes that Ptr is
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/// a pointer, Val is an i32 value, and Len is an 'intptr_t' value.
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Value *llvm::EmitMemChr(Value *Ptr, Value *Val,
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Value *Len, IRBuilder<> &B, const DataLayout *TD,
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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()->getParent()->getParent();
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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,
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ArrayRef<Attribute::AttrKind>(AVs, 2));
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LLVMContext &Context = B.GetInsertBlock()->getContext();
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Value *MemChr = M->getOrInsertFunction("memchr",
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AttributeSet::get(M->getContext(), AS),
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B.getInt8PtrTy(),
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B.getInt8PtrTy(),
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B.getInt32Ty(),
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TD->getIntPtrType(Context),
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NULL);
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CallInst *CI = B.CreateCall3(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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/// EmitMemCmp - Emit a call to the memcmp function.
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Value *llvm::EmitMemCmp(Value *Ptr1, Value *Ptr2,
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Value *Len, IRBuilder<> &B, const DataLayout *TD,
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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()->getParent()->getParent();
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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,
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ArrayRef<Attribute::AttrKind>(AVs, 2));
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LLVMContext &Context = B.GetInsertBlock()->getContext();
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Value *MemCmp = M->getOrInsertFunction("memcmp",
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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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B.getInt8PtrTy(),
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TD->getIntPtrType(Context), NULL);
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CallInst *CI = B.CreateCall3(MemCmp, CastToCStr(Ptr1, B), CastToCStr(Ptr2, B),
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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, 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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return;
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}
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/// EmitUnaryFloatFnCall - Emit a call to the unary function named 'Name' (e.g.
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/// 'floor'). This function is known to take a single of type matching 'Op' and
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/// returns one value with the same type. If 'Op' is a long double, 'l' is
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/// added as the suffix of name, if 'Op' is a float, we add a 'f' suffix.
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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()->getParent()->getParent();
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Value *Callee = M->getOrInsertFunction(Name, Op->getType(),
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Op->getType(), NULL);
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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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/// EmitBinaryFloatFnCall - Emit a call to the binary function named 'Name'
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/// (e.g. 'fmin'). This function is known to take type matching 'Op1' and 'Op2'
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/// and return one value with the same type. If 'Op1/Op2' are long double, 'l'
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/// is added as the suffix of name, if 'Op1/Op2' is a float, we add a 'f'
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/// suffix.
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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()->getParent()->getParent();
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Value *Callee = M->getOrInsertFunction(Name, Op1->getType(),
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Op1->getType(), Op2->getType(), NULL);
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CallInst *CI = B.CreateCall2(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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/// EmitPutChar - Emit a call to the putchar function. This assumes that Char
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/// is an integer.
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Value *llvm::EmitPutChar(Value *Char, IRBuilder<> &B, const DataLayout *TD,
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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()->getParent()->getParent();
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Value *PutChar = M->getOrInsertFunction("putchar", B.getInt32Ty(),
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B.getInt32Ty(), NULL);
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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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/// EmitPutS - Emit a call to the puts function. This assumes that Str is
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/// some pointer.
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Value *llvm::EmitPutS(Value *Str, IRBuilder<> &B, const DataLayout *TD,
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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()->getParent()->getParent();
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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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NULL);
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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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/// EmitFPutC - Emit a call to the fputc function. This assumes that Char is
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/// an integer and File is a pointer to FILE.
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Value *llvm::EmitFPutC(Value *Char, Value *File, IRBuilder<> &B,
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const DataLayout *TD, 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()->getParent()->getParent();
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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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NULL);
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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(), NULL);
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Char = B.CreateIntCast(Char, B.getInt32Ty(), /*isSigned*/true,
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"chari");
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CallInst *CI = B.CreateCall2(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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/// EmitFPutS - Emit a call to the puts function. Str is required to be a
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/// pointer and File is a pointer to FILE.
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Value *llvm::EmitFPutS(Value *Str, Value *File, IRBuilder<> &B,
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const DataLayout *TD, 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()->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(), NULL);
|
|
else
|
|
F = M->getOrInsertFunction(FPutsName, 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());
|
|
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 *TD,
|
|
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),
|
|
TD->getIntPtrType(Context),
|
|
B.getInt8PtrTy(),
|
|
TD->getIntPtrType(Context),
|
|
TD->getIntPtrType(Context),
|
|
File->getType(), NULL);
|
|
else
|
|
F = M->getOrInsertFunction(FWriteName, 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());
|
|
return CI;
|
|
}
|
|
|
|
SimplifyFortifiedLibCalls::~SimplifyFortifiedLibCalls() { }
|
|
|
|
bool SimplifyFortifiedLibCalls::fold(CallInst *CI, const DataLayout *TD,
|
|
const TargetLibraryInfo *TLI) {
|
|
// We really need DataLayout 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,
|
|
TLI, Name.substr(2, 6));
|
|
if (!Ret)
|
|
return false;
|
|
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, TLI,
|
|
Name.substr(2, 7));
|
|
if (!Ret)
|
|
return false;
|
|
replaceCall(Ret);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
if (Name == "__strcat_chk") {
|
|
return false;
|
|
}
|
|
|
|
if (Name == "__strncat_chk") {
|
|
return false;
|
|
}
|
|
|
|
return false;
|
|
}
|