virtual Value *callOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
this->CI = CI;
FunctionType *FT = Callee->getFunctionType();
- LLVMContext &Context = CI->getParent()->getContext();
// 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))
+ FT->getParamType(2) != TD->getIntPtrType(FT->getParamType(0)) ||
+ FT->getParamType(3) != TD->getIntPtrType(FT->getParamType(1)))
return 0;
if (isFoldable(3, 2, false)) {
virtual Value *callOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
this->CI = CI;
FunctionType *FT = Callee->getFunctionType();
- LLVMContext &Context = CI->getParent()->getContext();
// 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))
+ FT->getParamType(2) != TD->getIntPtrType(FT->getParamType(0)) ||
+ FT->getParamType(3) != TD->getIntPtrType(FT->getParamType(1)))
return 0;
if (isFoldable(3, 2, false)) {
virtual Value *callOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
this->CI = CI;
FunctionType *FT = Callee->getFunctionType();
- LLVMContext &Context = CI->getParent()->getContext();
// 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))
+ FT->getParamType(2) != TD->getIntPtrType(FT->getParamType(0)) ||
+ FT->getParamType(3) != TD->getIntPtrType(FT->getParamType(0)))
return 0;
if (isFoldable(3, 2, false)) {
FT->getReturnType() != FT->getParamType(0) ||
FT->getParamType(0) != FT->getParamType(1) ||
FT->getParamType(0) != Type::getInt8PtrTy(Context) ||
- FT->getParamType(2) != TD->getIntPtrType(Context))
+ FT->getParamType(2) != TD->getIntPtrType(FT->getParamType(0)))
+ return 0;
+
+ Value *Dst = CI->getArgOperand(0), *Src = CI->getArgOperand(1);
+ if (Dst == Src) // __strcpy_chk(x,x) -> x
+ return Src;
+
+ // If a) we don't have any length information, or b) we know this will
+ // fit then just lower to a plain strcpy. Otherwise we'll keep our
+ // strcpy_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(Dst, Src, B, TD, TLI, Name.substr(2, 6));
+ return Ret;
+ } else {
+ // Maybe we can stil fold __strcpy_chk to __memcpy_chk.
+ uint64_t Len = GetStringLength(Src);
+ if (Len == 0) return 0;
+
+ // This optimization require DataLayout.
+ if (!TD) return 0;
+
+ Value *Ret =
+ EmitMemCpyChk(Dst, Src,
+ ConstantInt::get(TD->getIntPtrType(Dst->getType()),
+ Len), CI->getArgOperand(2), B, TD, TLI);
+ return Ret;
+ }
+ return 0;
+ }
+};
+
+struct StpCpyChkOpt : public InstFortifiedLibCallOptimization {
+ virtual Value *callOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+ this->CI = CI;
+ StringRef Name = Callee->getName();
+ FunctionType *FT = Callee->getFunctionType();
+ LLVMContext &Context = CI->getParent()->getContext();
+
+ // 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(FT->getParamType(0)))
return 0;
+ Value *Dst = CI->getArgOperand(0), *Src = CI->getArgOperand(1);
+ if (Dst == Src) { // stpcpy(x,x) -> x+strlen(x)
+ Value *StrLen = EmitStrLen(Src, B, TD, TLI);
+ return StrLen ? B.CreateInBoundsGEP(Dst, StrLen) : 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.
+ // fit then just lower to a plain stpcpy. Otherwise we'll keep our
+ // stpcpy_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));
+ Value *Ret = EmitStrCpy(Dst, Src, B, TD, TLI, Name.substr(2, 6));
return Ret;
+ } else {
+ // Maybe we can stil fold __stpcpy_chk to __memcpy_chk.
+ uint64_t Len = GetStringLength(Src);
+ if (Len == 0) return 0;
+
+ // This optimization require DataLayout.
+ if (!TD) return 0;
+
+ Type *PT = FT->getParamType(0);
+ Value *LenV = ConstantInt::get(TD->getIntPtrType(PT), Len);
+ Value *DstEnd = B.CreateGEP(Dst,
+ ConstantInt::get(TD->getIntPtrType(PT),
+ Len - 1));
+ if (!EmitMemCpyChk(Dst, Src, LenV, CI->getArgOperand(2), B, TD, TLI))
+ return 0;
+ return DstEnd;
}
return 0;
}
FT->getParamType(0) != FT->getParamType(1) ||
FT->getParamType(0) != Type::getInt8PtrTy(Context) ||
!FT->getParamType(2)->isIntegerTy() ||
- FT->getParamType(3) != TD->getIntPtrType(Context))
+ FT->getParamType(3) != TD->getIntPtrType(FT->getParamType(0)))
return 0;
if (isFoldable(3, 2, false)) {
// We have enough information to now generate the memcpy call to do the
// concatenation for us. Make a memcpy to copy the nul byte with align = 1.
B.CreateMemCpy(CpyDst, Src,
- ConstantInt::get(TD->getIntPtrType(*Context), Len + 1), 1);
+ ConstantInt::get(TD->getIntPtrType(Src->getType()),
+ Len + 1), 1);
return Dst;
}
};
if (Len == 0 || !FT->getParamType(1)->isIntegerTy(32))// memchr needs i32.
return 0;
+ Type *PT = FT->getParamType(0);
return EmitMemChr(SrcStr, CI->getArgOperand(1), // include nul.
- ConstantInt::get(TD->getIntPtrType(*Context), Len),
+ ConstantInt::get(TD->getIntPtrType(PT), Len),
B, TD, TLI);
}
// These optimizations require DataLayout.
if (!TD) return 0;
+ Type *PT = FT->getParamType(0);
return EmitMemCmp(Str1P, Str2P,
- ConstantInt::get(TD->getIntPtrType(*Context),
+ ConstantInt::get(TD->getIntPtrType(PT),
std::min(Len1, Len2)), B, TD, TLI);
}
}
};
+struct StrCpyOpt : public LibCallOptimization {
+ virtual Value *callOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+ // Verify the "strcpy" function prototype.
+ FunctionType *FT = Callee->getFunctionType();
+ if (FT->getNumParams() != 2 ||
+ FT->getReturnType() != FT->getParamType(0) ||
+ FT->getParamType(0) != FT->getParamType(1) ||
+ FT->getParamType(0) != B.getInt8PtrTy())
+ return 0;
+
+ Value *Dst = CI->getArgOperand(0), *Src = CI->getArgOperand(1);
+ if (Dst == Src) // strcpy(x,x) -> x
+ return Src;
+
+ // These optimizations require DataLayout.
+ if (!TD) return 0;
+
+ // See if we can get the length of the input string.
+ uint64_t Len = GetStringLength(Src);
+ if (Len == 0) return 0;
+
+ // We have enough information to now generate the memcpy call to do the
+ // copy for us. Make a memcpy to copy the nul byte with align = 1.
+ B.CreateMemCpy(Dst, Src,
+ ConstantInt::get(TD->getIntPtrType(Dst->getType()), Len), 1);
+ return Dst;
+ }
+};
+
+struct StpCpyOpt: public LibCallOptimization {
+ virtual Value *callOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+ // Verify the "stpcpy" function prototype.
+ FunctionType *FT = Callee->getFunctionType();
+ if (FT->getNumParams() != 2 ||
+ FT->getReturnType() != FT->getParamType(0) ||
+ FT->getParamType(0) != FT->getParamType(1) ||
+ FT->getParamType(0) != B.getInt8PtrTy())
+ return 0;
+
+ // These optimizations require DataLayout.
+ if (!TD) return 0;
+
+ Value *Dst = CI->getArgOperand(0), *Src = CI->getArgOperand(1);
+ if (Dst == Src) { // stpcpy(x,x) -> x+strlen(x)
+ Value *StrLen = EmitStrLen(Src, B, TD, TLI);
+ return StrLen ? B.CreateInBoundsGEP(Dst, StrLen) : 0;
+ }
+
+ // See if we can get the length of the input string.
+ uint64_t Len = GetStringLength(Src);
+ if (Len == 0) return 0;
+
+ Type *PT = FT->getParamType(0);
+ Value *LenV = ConstantInt::get(TD->getIntPtrType(PT), Len);
+ Value *DstEnd = B.CreateGEP(Dst,
+ ConstantInt::get(TD->getIntPtrType(PT),
+ Len - 1));
+
+ // We have enough information to now generate the memcpy call to do the
+ // copy for us. Make a memcpy to copy the nul byte with align = 1.
+ B.CreateMemCpy(Dst, Src, LenV, 1);
+ return DstEnd;
+ }
+};
+
+struct StrNCpyOpt : public LibCallOptimization {
+ virtual Value *callOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+ FunctionType *FT = Callee->getFunctionType();
+ if (FT->getNumParams() != 3 || FT->getReturnType() != FT->getParamType(0) ||
+ FT->getParamType(0) != FT->getParamType(1) ||
+ FT->getParamType(0) != B.getInt8PtrTy() ||
+ !FT->getParamType(2)->isIntegerTy())
+ return 0;
+
+ Value *Dst = CI->getArgOperand(0);
+ Value *Src = CI->getArgOperand(1);
+ Value *LenOp = CI->getArgOperand(2);
+
+ // See if we can get the length of the input string.
+ uint64_t SrcLen = GetStringLength(Src);
+ if (SrcLen == 0) return 0;
+ --SrcLen;
+
+ if (SrcLen == 0) {
+ // strncpy(x, "", y) -> memset(x, '\0', y, 1)
+ B.CreateMemSet(Dst, B.getInt8('\0'), LenOp, 1);
+ return Dst;
+ }
+
+ uint64_t Len;
+ if (ConstantInt *LengthArg = dyn_cast<ConstantInt>(LenOp))
+ Len = LengthArg->getZExtValue();
+ else
+ return 0;
+
+ if (Len == 0) return Dst; // strncpy(x, y, 0) -> x
+
+ // These optimizations require DataLayout.
+ if (!TD) return 0;
+
+ // Let strncpy handle the zero padding
+ if (Len > SrcLen+1) return 0;
+
+ Type *PT = FT->getParamType(0);
+ // strncpy(x, s, c) -> memcpy(x, s, c, 1) [s and c are constant]
+ B.CreateMemCpy(Dst, Src,
+ ConstantInt::get(TD->getIntPtrType(PT), Len), 1);
+
+ return Dst;
+ }
+};
+
} // End anonymous namespace.
namespace llvm {
MemMoveChkOpt MemMoveChk;
MemSetChkOpt MemSetChk;
StrCpyChkOpt StrCpyChk;
+ StpCpyChkOpt StpCpyChk;
StrNCpyChkOpt StrNCpyChk;
// String and memory library call optimizations.
StrRChrOpt StrRChr;
StrCmpOpt StrCmp;
StrNCmpOpt StrNCmp;
+ StrCpyOpt StrCpy;
+ StpCpyOpt StpCpy;
+ StrNCpyOpt StrNCpy;
void initOptimizations();
public:
Optimizations["__memmove_chk"] = &MemMoveChk;
Optimizations["__memset_chk"] = &MemSetChk;
Optimizations["__strcpy_chk"] = &StrCpyChk;
- Optimizations["__stpcpy_chk"] = &StrCpyChk;
+ Optimizations["__stpcpy_chk"] = &StpCpyChk;
Optimizations["__strncpy_chk"] = &StrNCpyChk;
Optimizations["__stpncpy_chk"] = &StrNCpyChk;
- Optimizations["strcmp"] = &StrCmp;
- Optimizations["strncmp"] = &StrNCmp;
// String and memory library call optimizations.
Optimizations["strcat"] = &StrCat;
Optimizations["strncat"] = &StrNCat;
Optimizations["strchr"] = &StrChr;
Optimizations["strrchr"] = &StrRChr;
+ Optimizations["strcmp"] = &StrCmp;
+ Optimizations["strncmp"] = &StrNCmp;
+ Optimizations["strcpy"] = &StrCpy;
+ Optimizations["stpcpy"] = &StpCpy;
+ Optimizations["strncpy"] = &StrNCpy;
}
Value *LibCallSimplifierImpl::optimizeCall(CallInst *CI) {
projects / oota-llvm.git / blobdiff