#include "llvm/Support/IRBuilder.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetLibraryInfo.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
-#include "llvm/Config/config.h"
+#include "llvm/Config/config.h" // FIXME: Shouldn't depend on host!
using namespace llvm;
STATISTIC(NumSimplified, "Number of library calls simplified");
protected:
Function *Caller;
const TargetData *TD;
+ const TargetLibraryInfo *TLI;
LLVMContext* Context;
public:
LibCallOptimization() { }
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B)
=0;
- Value *OptimizeCall(CallInst *CI, const TargetData *TD, IRBuilder<> &B) {
+ Value *OptimizeCall(CallInst *CI, const TargetData *TD,
+ const TargetLibraryInfo *TLI, IRBuilder<> &B) {
Caller = CI->getParent()->getParent();
this->TD = TD;
+ this->TLI = TLI;
if (CI->getCalledFunction())
Context = &CI->getCalledFunction()->getContext();
}
return true;
}
+
+static bool CallHasFloatingPointArgument(const CallInst *CI) {
+ for (CallInst::const_op_iterator it = CI->op_begin(), e = CI->op_end();
+ it != e; ++it) {
+ if ((*it)->getType()->isFloatingPointTy())
+ return true;
+ }
+ return false;
+}
/// IsOnlyUsedInEqualityComparison - Return true if it is only used in equality
/// comparisons with With.
// Verify the "strcat" function prototype.
const FunctionType *FT = Callee->getFunctionType();
if (FT->getNumParams() != 2 ||
- FT->getReturnType() != Type::getInt8PtrTy(*Context) ||
+ FT->getReturnType() != B.getInt8PtrTy() ||
FT->getParamType(0) != FT->getReturnType() ||
FT->getParamType(1) != FT->getReturnType())
return 0;
// 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.
- EmitMemCpy(CpyDst, Src,
- ConstantInt::get(TD->getIntPtrType(*Context), Len+1),
- 1, false, B, TD);
+ B.CreateMemCpy(CpyDst, Src,
+ ConstantInt::get(TD->getIntPtrType(*Context), Len + 1), 1);
}
};
// Verify the "strncat" function prototype.
const FunctionType *FT = Callee->getFunctionType();
if (FT->getNumParams() != 3 ||
- FT->getReturnType() != Type::getInt8PtrTy(*Context) ||
+ FT->getReturnType() != B.getInt8PtrTy() ||
FT->getParamType(0) != FT->getReturnType() ||
FT->getParamType(1) != FT->getReturnType() ||
!FT->getParamType(2)->isIntegerTy())
// Verify the "strchr" function prototype.
const FunctionType *FT = Callee->getFunctionType();
if (FT->getNumParams() != 2 ||
- FT->getReturnType() != Type::getInt8PtrTy(*Context) ||
- FT->getParamType(0) != FT->getReturnType())
+ FT->getReturnType() != B.getInt8PtrTy() ||
+ FT->getParamType(0) != FT->getReturnType() ||
+ !FT->getParamType(1)->isIntegerTy(32))
return 0;
Value *SrcStr = CI->getArgOperand(0);
// strchr can find the nul character.
Str += '\0';
- char CharValue = CharC->getSExtValue();
// Compute the offset.
- uint64_t i = 0;
- while (1) {
- if (i == Str.size()) // Didn't find the char. strchr returns null.
- return Constant::getNullValue(CI->getType());
- // Did we find our match?
- if (Str[i] == CharValue)
- break;
- ++i;
- }
+ size_t I = Str.find(CharC->getSExtValue());
+ if (I == std::string::npos) // Didn't find the char. strchr returns null.
+ return Constant::getNullValue(CI->getType());
// strchr(s+n,c) -> gep(s+n+i,c)
- Value *Idx = ConstantInt::get(Type::getInt64Ty(*Context), i);
- return B.CreateGEP(SrcStr, Idx, "strchr");
+ return B.CreateGEP(SrcStr, B.getInt64(I), "strchr");
+ }
+};
+
+//===---------------------------------------===//
+// 'strrchr' Optimizations
+
+struct StrRChrOpt : public LibCallOptimization {
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+ // Verify the "strrchr" function prototype.
+ const FunctionType *FT = Callee->getFunctionType();
+ if (FT->getNumParams() != 2 ||
+ FT->getReturnType() != B.getInt8PtrTy() ||
+ FT->getParamType(0) != FT->getReturnType() ||
+ !FT->getParamType(1)->isIntegerTy(32))
+ return 0;
+
+ Value *SrcStr = CI->getArgOperand(0);
+ ConstantInt *CharC = dyn_cast<ConstantInt>(CI->getArgOperand(1));
+
+ // Cannot fold anything if we're not looking for a constant.
+ if (!CharC)
+ return 0;
+
+ std::string Str;
+ if (!GetConstantStringInfo(SrcStr, Str)) {
+ // strrchr(s, 0) -> strchr(s, 0)
+ if (TD && CharC->isZero())
+ return EmitStrChr(SrcStr, '\0', B, TD);
+ return 0;
+ }
+
+ // strrchr can find the nul character.
+ Str += '\0';
+
+ // Compute the offset.
+ size_t I = Str.rfind(CharC->getSExtValue());
+ if (I == std::string::npos) // Didn't find the char. Return null.
+ return Constant::getNullValue(CI->getType());
+
+ // strrchr(s+n,c) -> gep(s+n+i,c)
+ return B.CreateGEP(SrcStr, B.getInt64(I), "strrchr");
}
};
if (FT->getNumParams() != 2 ||
!FT->getReturnType()->isIntegerTy(32) ||
FT->getParamType(0) != FT->getParamType(1) ||
- FT->getParamType(0) != Type::getInt8PtrTy(*Context))
+ FT->getParamType(0) != B.getInt8PtrTy())
return 0;
Value *Str1P = CI->getArgOperand(0), *Str2P = CI->getArgOperand(1);
if (FT->getNumParams() != 3 ||
!FT->getReturnType()->isIntegerTy(32) ||
FT->getParamType(0) != FT->getParamType(1) ||
- FT->getParamType(0) != Type::getInt8PtrTy(*Context) ||
+ FT->getParamType(0) != B.getInt8PtrTy() ||
!FT->getParamType(2)->isIntegerTy())
return 0;
if (FT->getNumParams() != NumParams ||
FT->getReturnType() != FT->getParamType(0) ||
FT->getParamType(0) != FT->getParamType(1) ||
- FT->getParamType(0) != Type::getInt8PtrTy(*Context))
+ FT->getParamType(0) != B.getInt8PtrTy())
return 0;
Value *Dst = CI->getArgOperand(0), *Src = CI->getArgOperand(1);
ConstantInt::get(TD->getIntPtrType(*Context), Len),
CI->getArgOperand(2), B, TD);
else
- EmitMemCpy(Dst, Src,
- ConstantInt::get(TD->getIntPtrType(*Context), Len),
- 1, false, B, TD);
+ B.CreateMemCpy(Dst, Src,
+ ConstantInt::get(TD->getIntPtrType(*Context), Len), 1);
return Dst;
}
};
const FunctionType *FT = Callee->getFunctionType();
if (FT->getNumParams() != 3 || FT->getReturnType() != FT->getParamType(0) ||
FT->getParamType(0) != FT->getParamType(1) ||
- FT->getParamType(0) != Type::getInt8PtrTy(*Context) ||
+ FT->getParamType(0) != B.getInt8PtrTy() ||
!FT->getParamType(2)->isIntegerTy())
return 0;
if (SrcLen == 0) {
// strncpy(x, "", y) -> memset(x, '\0', y, 1)
- EmitMemSet(Dst, ConstantInt::get(Type::getInt8Ty(*Context), '\0'),
- LenOp, false, B, TD);
+ B.CreateMemSet(Dst, B.getInt8('\0'), LenOp, 1);
return Dst;
}
if (Len > SrcLen+1) return 0;
// strncpy(x, s, c) -> memcpy(x, s, c, 1) [s and c are constant]
- EmitMemCpy(Dst, Src,
- ConstantInt::get(TD->getIntPtrType(*Context), Len),
- 1, false, B, TD);
+ B.CreateMemCpy(Dst, Src,
+ ConstantInt::get(TD->getIntPtrType(*Context), Len), 1);
return Dst;
}
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
const FunctionType *FT = Callee->getFunctionType();
if (FT->getNumParams() != 1 ||
- FT->getParamType(0) != Type::getInt8PtrTy(*Context) ||
+ FT->getParamType(0) != B.getInt8PtrTy() ||
!FT->getReturnType()->isIntegerTy())
return 0;
}
};
+
+//===---------------------------------------===//
+// 'strpbrk' Optimizations
+
+struct StrPBrkOpt : public LibCallOptimization {
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+ const FunctionType *FT = Callee->getFunctionType();
+ if (FT->getNumParams() != 2 ||
+ FT->getParamType(0) != B.getInt8PtrTy() ||
+ FT->getParamType(1) != FT->getParamType(0) ||
+ FT->getReturnType() != FT->getParamType(0))
+ return 0;
+
+ std::string S1, S2;
+ bool HasS1 = GetConstantStringInfo(CI->getArgOperand(0), S1);
+ bool HasS2 = GetConstantStringInfo(CI->getArgOperand(1), S2);
+
+ // strpbrk(s, "") -> NULL
+ // strpbrk("", s) -> NULL
+ if ((HasS1 && S1.empty()) || (HasS2 && S2.empty()))
+ return Constant::getNullValue(CI->getType());
+
+ // Constant folding.
+ if (HasS1 && HasS2) {
+ size_t I = S1.find_first_of(S2);
+ if (I == std::string::npos) // No match.
+ return Constant::getNullValue(CI->getType());
+
+ return B.CreateGEP(CI->getArgOperand(0), B.getInt64(I), "strpbrk");
+ }
+
+ // strpbrk(s, "a") -> strchr(s, 'a')
+ if (TD && HasS2 && S2.size() == 1)
+ return EmitStrChr(CI->getArgOperand(0), S2[0], B, TD);
+
+ return 0;
+ }
+};
+
//===---------------------------------------===//
// 'strto*' Optimizations. This handles strtol, strtod, strtof, strtoul, etc.
Value *EndPtr = CI->getArgOperand(1);
if (isa<ConstantPointerNull>(EndPtr)) {
- CI->setOnlyReadsMemory();
+ // With a null EndPtr, this function won't capture the main argument.
+ // It would be readonly too, except that it still may write to errno.
CI->addAttribute(1, Attribute::NoCapture);
}
}
};
+//===---------------------------------------===//
+// 'strspn' Optimizations
+
+struct StrSpnOpt : public LibCallOptimization {
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+ const FunctionType *FT = Callee->getFunctionType();
+ if (FT->getNumParams() != 2 ||
+ FT->getParamType(0) != B.getInt8PtrTy() ||
+ FT->getParamType(1) != FT->getParamType(0) ||
+ !FT->getReturnType()->isIntegerTy())
+ return 0;
+
+ std::string S1, S2;
+ bool HasS1 = GetConstantStringInfo(CI->getArgOperand(0), S1);
+ bool HasS2 = GetConstantStringInfo(CI->getArgOperand(1), S2);
+
+ // strspn(s, "") -> 0
+ // strspn("", s) -> 0
+ if ((HasS1 && S1.empty()) || (HasS2 && S2.empty()))
+ return Constant::getNullValue(CI->getType());
+
+ // Constant folding.
+ if (HasS1 && HasS2)
+ return ConstantInt::get(CI->getType(), strspn(S1.c_str(), S2.c_str()));
+
+ return 0;
+ }
+};
+
+//===---------------------------------------===//
+// 'strcspn' Optimizations
+
+struct StrCSpnOpt : public LibCallOptimization {
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+ const FunctionType *FT = Callee->getFunctionType();
+ if (FT->getNumParams() != 2 ||
+ FT->getParamType(0) != B.getInt8PtrTy() ||
+ FT->getParamType(1) != FT->getParamType(0) ||
+ !FT->getReturnType()->isIntegerTy())
+ return 0;
+
+ std::string S1, S2;
+ bool HasS1 = GetConstantStringInfo(CI->getArgOperand(0), S1);
+ bool HasS2 = GetConstantStringInfo(CI->getArgOperand(1), S2);
+
+ // strcspn("", s) -> 0
+ if (HasS1 && S1.empty())
+ return Constant::getNullValue(CI->getType());
+
+ // Constant folding.
+ if (HasS1 && HasS2)
+ return ConstantInt::get(CI->getType(), strcspn(S1.c_str(), S2.c_str()));
+
+ // strcspn(s, "") -> strlen(s)
+ if (TD && HasS2 && S2.empty())
+ return EmitStrLen(CI->getArgOperand(0), B, TD);
+
+ return 0;
+ }
+};
+
//===---------------------------------------===//
// 'strstr' Optimizations
return 0;
// memcpy(x, y, n) -> llvm.memcpy(x, y, n, 1)
- EmitMemCpy(CI->getArgOperand(0), CI->getArgOperand(1),
- CI->getArgOperand(2), 1, false, B, TD);
+ B.CreateMemCpy(CI->getArgOperand(0), CI->getArgOperand(1),
+ CI->getArgOperand(2), 1);
return CI->getArgOperand(0);
}
};
return 0;
// memmove(x, y, n) -> llvm.memmove(x, y, n, 1)
- EmitMemMove(CI->getArgOperand(0), CI->getArgOperand(1),
- CI->getArgOperand(2), 1, false, B, TD);
+ B.CreateMemMove(CI->getArgOperand(0), CI->getArgOperand(1),
+ CI->getArgOperand(2), 1);
return CI->getArgOperand(0);
}
};
return 0;
// memset(p, v, n) -> llvm.memset(p, v, n, 1)
- Value *Val = B.CreateIntCast(CI->getArgOperand(1),
- Type::getInt8Ty(*Context), false);
- EmitMemSet(CI->getArgOperand(0), Val, CI->getArgOperand(2), false, B, TD);
+ Value *Val = B.CreateIntCast(CI->getArgOperand(1), B.getInt8Ty(), false);
+ B.CreateMemSet(CI->getArgOperand(0), Val, CI->getArgOperand(2), 1);
return CI->getArgOperand(0);
}
};
Value *LdExpArg = 0;
if (SIToFPInst *OpC = dyn_cast<SIToFPInst>(Op)) {
if (OpC->getOperand(0)->getType()->getPrimitiveSizeInBits() <= 32)
- LdExpArg = B.CreateSExt(OpC->getOperand(0),
- Type::getInt32Ty(*Context), "tmp");
+ LdExpArg = B.CreateSExt(OpC->getOperand(0), B.getInt32Ty(), "tmp");
} else if (UIToFPInst *OpC = dyn_cast<UIToFPInst>(Op)) {
if (OpC->getOperand(0)->getType()->getPrimitiveSizeInBits() < 32)
- LdExpArg = B.CreateZExt(OpC->getOperand(0),
- Type::getInt32Ty(*Context), "tmp");
+ LdExpArg = B.CreateZExt(OpC->getOperand(0), B.getInt32Ty(), "tmp");
}
if (LdExpArg) {
Module *M = Caller->getParent();
Value *Callee = M->getOrInsertFunction(Name, Op->getType(),
Op->getType(),
- Type::getInt32Ty(*Context),NULL);
+ B.getInt32Ty(), NULL);
CallInst *CI = B.CreateCall2(Callee, One, LdExpArg);
if (const Function *F = dyn_cast<Function>(Callee->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
Value *V = Cast->getOperand(0);
V = EmitUnaryFloatFnCall(V, Callee->getName().data(), B,
Callee->getAttributes());
- return B.CreateFPExt(V, Type::getDoubleTy(*Context));
+ return B.CreateFPExt(V, B.getDoubleTy());
}
};
if (ConstantInt *CI = dyn_cast<ConstantInt>(Op)) {
if (CI->getValue() == 0) // ffs(0) -> 0.
return Constant::getNullValue(CI->getType());
- return ConstantInt::get(Type::getInt32Ty(*Context), // ffs(c) -> cttz(c)+1
- CI->getValue().countTrailingZeros()+1);
+ // ffs(c) -> cttz(c)+1
+ return B.getInt32(CI->getValue().countTrailingZeros() + 1);
}
// ffs(x) -> x != 0 ? (i32)llvm.cttz(x)+1 : 0
- const Type *ArgType = Op->getType();
+ Type *ArgType = Op->getType();
Value *F = Intrinsic::getDeclaration(Callee->getParent(),
- Intrinsic::cttz, &ArgType, 1);
+ Intrinsic::cttz, ArgType);
Value *V = B.CreateCall(F, Op, "cttz");
V = B.CreateAdd(V, ConstantInt::get(V->getType(), 1), "tmp");
- V = B.CreateIntCast(V, Type::getInt32Ty(*Context), false, "tmp");
+ V = B.CreateIntCast(V, B.getInt32Ty(), false, "tmp");
Value *Cond = B.CreateICmpNE(Op, Constant::getNullValue(ArgType), "tmp");
- return B.CreateSelect(Cond, V,
- ConstantInt::get(Type::getInt32Ty(*Context), 0));
+ return B.CreateSelect(Cond, V, B.getInt32(0));
}
};
// isdigit(c) -> (c-'0') <u 10
Value *Op = CI->getArgOperand(0);
- Op = B.CreateSub(Op, ConstantInt::get(Type::getInt32Ty(*Context), '0'),
- "isdigittmp");
- Op = B.CreateICmpULT(Op, ConstantInt::get(Type::getInt32Ty(*Context), 10),
- "isdigit");
+ Op = B.CreateSub(Op, B.getInt32('0'), "isdigittmp");
+ Op = B.CreateICmpULT(Op, B.getInt32(10), "isdigit");
return B.CreateZExt(Op, CI->getType());
}
};
// isascii(c) -> c <u 128
Value *Op = CI->getArgOperand(0);
- Op = B.CreateICmpULT(Op, ConstantInt::get(Type::getInt32Ty(*Context), 128),
- "isascii");
+ Op = B.CreateICmpULT(Op, B.getInt32(128), "isascii");
return B.CreateZExt(Op, CI->getType());
}
};
// abs(x) -> x >s -1 ? x : -x
Value *Op = CI->getArgOperand(0);
- Value *Pos = B.CreateICmpSGT(Op,
- Constant::getAllOnesValue(Op->getType()),
+ Value *Pos = B.CreateICmpSGT(Op, Constant::getAllOnesValue(Op->getType()),
"ispos");
Value *Neg = B.CreateNeg(Op, "neg");
return B.CreateSelect(Pos, Op, Neg);
// 'printf' Optimizations
struct PrintFOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // Require one fixed pointer argument and an integer/void result.
- const FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() < 1 || !FT->getParamType(0)->isPointerTy() ||
- !(FT->getReturnType()->isIntegerTy() ||
- FT->getReturnType()->isVoidTy()))
- return 0;
-
+ Value *OptimizeFixedFormatString(Function *Callee, CallInst *CI,
+ IRBuilder<> &B) {
// Check for a fixed format string.
std::string FormatStr;
if (!GetConstantStringInfo(CI->getArgOperand(0), FormatStr))
return CI->use_empty() ? (Value*)CI :
ConstantInt::get(CI->getType(), 0);
- // printf("x") -> putchar('x'), even for '%'. Return the result of putchar
- // in case there is an error writing to stdout.
+ // Do not do any of the following transformations if the printf return value
+ // is used, in general the printf return value is not compatible with either
+ // putchar() or puts().
+ if (!CI->use_empty())
+ return 0;
+
+ // printf("x") -> putchar('x'), even for '%'.
if (FormatStr.size() == 1) {
- Value *Res = EmitPutChar(ConstantInt::get(Type::getInt32Ty(*Context),
- FormatStr[0]), B, TD);
+ Value *Res = EmitPutChar(B.getInt32(FormatStr[0]), B, TD);
if (CI->use_empty()) return CI;
return B.CreateIntCast(Res, CI->getType(), true);
}
// printf("%s\n", str) --> puts(str)
if (FormatStr == "%s\n" && CI->getNumArgOperands() > 1 &&
- CI->getArgOperand(1)->getType()->isPointerTy() &&
- CI->use_empty()) {
+ CI->getArgOperand(1)->getType()->isPointerTy()) {
EmitPutS(CI->getArgOperand(1), B, TD);
return CI;
}
return 0;
}
+
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+ // Require one fixed pointer argument and an integer/void result.
+ const FunctionType *FT = Callee->getFunctionType();
+ if (FT->getNumParams() < 1 || !FT->getParamType(0)->isPointerTy() ||
+ !(FT->getReturnType()->isIntegerTy() ||
+ FT->getReturnType()->isVoidTy()))
+ return 0;
+
+ if (Value *V = OptimizeFixedFormatString(Callee, CI, B)) {
+ return V;
+ }
+
+ // printf(format, ...) -> iprintf(format, ...) if no floating point
+ // arguments.
+ if (TLI->has(LibFunc::iprintf) && !CallHasFloatingPointArgument(CI)) {
+ Module *M = B.GetInsertBlock()->getParent()->getParent();
+ Constant *IPrintFFn =
+ M->getOrInsertFunction("iprintf", FT, Callee->getAttributes());
+ CallInst *New = cast<CallInst>(CI->clone());
+ New->setCalledFunction(IPrintFFn);
+ B.Insert(New);
+ return New;
+ }
+ return 0;
+ }
};
//===---------------------------------------===//
// 'sprintf' Optimizations
struct SPrintFOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // Require two fixed pointer arguments and an integer result.
- const FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() != 2 || !FT->getParamType(0)->isPointerTy() ||
- !FT->getParamType(1)->isPointerTy() ||
- !FT->getReturnType()->isIntegerTy())
- return 0;
-
+ Value *OptimizeFixedFormatString(Function *Callee, CallInst *CI,
+ IRBuilder<> &B) {
// Check for a fixed format string.
std::string FormatStr;
if (!GetConstantStringInfo(CI->getArgOperand(1), FormatStr))
if (!TD) return 0;
// sprintf(str, fmt) -> llvm.memcpy(str, fmt, strlen(fmt)+1, 1)
- EmitMemCpy(CI->getArgOperand(0), CI->getArgOperand(1), // Copy the
- ConstantInt::get(TD->getIntPtrType(*Context), // nul byte.
- FormatStr.size() + 1), 1, false, B, TD);
+ B.CreateMemCpy(CI->getArgOperand(0), CI->getArgOperand(1),
+ ConstantInt::get(TD->getIntPtrType(*Context), // Copy the
+ FormatStr.size() + 1), 1); // nul byte.
return ConstantInt::get(CI->getType(), FormatStr.size());
}
if (FormatStr[1] == 'c') {
// sprintf(dst, "%c", chr) --> *(i8*)dst = chr; *((i8*)dst+1) = 0
if (!CI->getArgOperand(2)->getType()->isIntegerTy()) return 0;
- Value *V = B.CreateTrunc(CI->getArgOperand(2),
- Type::getInt8Ty(*Context), "char");
+ Value *V = B.CreateTrunc(CI->getArgOperand(2), B.getInt8Ty(), "char");
Value *Ptr = CastToCStr(CI->getArgOperand(0), B);
B.CreateStore(V, Ptr);
- Ptr = B.CreateGEP(Ptr, ConstantInt::get(Type::getInt32Ty(*Context), 1),
- "nul");
- B.CreateStore(Constant::getNullValue(Type::getInt8Ty(*Context)), Ptr);
+ Ptr = B.CreateGEP(Ptr, B.getInt32(1), "nul");
+ B.CreateStore(B.getInt8(0), Ptr);
return ConstantInt::get(CI->getType(), 1);
}
Value *IncLen = B.CreateAdd(Len,
ConstantInt::get(Len->getType(), 1),
"leninc");
- EmitMemCpy(CI->getArgOperand(0), CI->getArgOperand(2),
- IncLen, 1, false, B, TD);
+ B.CreateMemCpy(CI->getArgOperand(0), CI->getArgOperand(2), IncLen, 1);
// The sprintf result is the unincremented number of bytes in the string.
return B.CreateIntCast(Len, CI->getType(), false);
}
return 0;
}
+
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+ // Require two fixed pointer arguments and an integer result.
+ const FunctionType *FT = Callee->getFunctionType();
+ if (FT->getNumParams() != 2 || !FT->getParamType(0)->isPointerTy() ||
+ !FT->getParamType(1)->isPointerTy() ||
+ !FT->getReturnType()->isIntegerTy())
+ return 0;
+
+ if (Value *V = OptimizeFixedFormatString(Callee, CI, B)) {
+ return V;
+ }
+
+ // sprintf(str, format, ...) -> siprintf(str, format, ...) if no floating
+ // point arguments.
+ if (TLI->has(LibFunc::siprintf) && !CallHasFloatingPointArgument(CI)) {
+ Module *M = B.GetInsertBlock()->getParent()->getParent();
+ Constant *SIPrintFFn =
+ M->getOrInsertFunction("siprintf", FT, Callee->getAttributes());
+ CallInst *New = cast<CallInst>(CI->clone());
+ New->setCalledFunction(SIPrintFFn);
+ B.Insert(New);
+ return New;
+ }
+ return 0;
+ }
};
//===---------------------------------------===//
// 'fprintf' Optimizations
struct FPrintFOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // Require two fixed paramters as pointers and integer result.
- const FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() != 2 || !FT->getParamType(0)->isPointerTy() ||
- !FT->getParamType(1)->isPointerTy() ||
- !FT->getReturnType()->isIntegerTy())
- return 0;
-
+ Value *OptimizeFixedFormatString(Function *Callee, CallInst *CI,
+ IRBuilder<> &B) {
// All the optimizations depend on the format string.
std::string FormatStr;
if (!GetConstantStringInfo(CI->getArgOperand(1), FormatStr))
}
return 0;
}
+
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+ // Require two fixed paramters as pointers and integer result.
+ const FunctionType *FT = Callee->getFunctionType();
+ if (FT->getNumParams() != 2 || !FT->getParamType(0)->isPointerTy() ||
+ !FT->getParamType(1)->isPointerTy() ||
+ !FT->getReturnType()->isIntegerTy())
+ return 0;
+
+ if (Value *V = OptimizeFixedFormatString(Callee, CI, B)) {
+ return V;
+ }
+
+ // fprintf(stream, format, ...) -> fiprintf(stream, format, ...) if no
+ // floating point arguments.
+ if (TLI->has(LibFunc::fiprintf) && !CallHasFloatingPointArgument(CI)) {
+ Module *M = B.GetInsertBlock()->getParent()->getParent();
+ Constant *FIPrintFFn =
+ M->getOrInsertFunction("fiprintf", FT, Callee->getAttributes());
+ CallInst *New = cast<CallInst>(CI->clone());
+ New->setCalledFunction(FIPrintFFn);
+ B.Insert(New);
+ return New;
+ }
+ return 0;
+ }
+};
+
+//===---------------------------------------===//
+// 'puts' Optimizations
+
+struct PutsOpt : public LibCallOptimization {
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+ // Require one fixed pointer argument and an integer/void result.
+ const FunctionType *FT = Callee->getFunctionType();
+ if (FT->getNumParams() < 1 || !FT->getParamType(0)->isPointerTy() ||
+ !(FT->getReturnType()->isIntegerTy() ||
+ FT->getReturnType()->isVoidTy()))
+ return 0;
+
+ // Check for a constant string.
+ std::string Str;
+ if (!GetConstantStringInfo(CI->getArgOperand(0), Str))
+ return 0;
+
+ if (Str.empty() && CI->use_empty()) {
+ // puts("") -> putchar('\n')
+ Value *Res = EmitPutChar(B.getInt32('\n'), B, TD);
+ if (CI->use_empty()) return CI;
+ return B.CreateIntCast(Res, CI->getType(), true);
+ }
+
+ return 0;
+ }
};
} // end anonymous namespace.
/// This pass optimizes well known library functions from libc and libm.
///
class SimplifyLibCalls : public FunctionPass {
+ TargetLibraryInfo *TLI;
+
StringMap<LibCallOptimization*> Optimizations;
// String and Memory LibCall Optimizations
- StrCatOpt StrCat; StrNCatOpt StrNCat; StrChrOpt StrChr; StrCmpOpt StrCmp;
- StrNCmpOpt StrNCmp; StrCpyOpt StrCpy; StrCpyOpt StrCpyChk;
- StrNCpyOpt StrNCpy; StrLenOpt StrLen;
- StrToOpt StrTo; StrStrOpt StrStr;
+ StrCatOpt StrCat; StrNCatOpt StrNCat; StrChrOpt StrChr; StrRChrOpt StrRChr;
+ StrCmpOpt StrCmp; StrNCmpOpt StrNCmp; StrCpyOpt StrCpy; StrCpyOpt StrCpyChk;
+ StrNCpyOpt StrNCpy; StrLenOpt StrLen; StrPBrkOpt StrPBrk;
+ StrToOpt StrTo; StrSpnOpt StrSpn; StrCSpnOpt StrCSpn; StrStrOpt StrStr;
MemCmpOpt MemCmp; MemCpyOpt MemCpy; MemMoveOpt MemMove; MemSetOpt MemSet;
// Math Library Optimizations
PowOpt Pow; Exp2Opt Exp2; UnaryDoubleFPOpt UnaryDoubleFP;
// Formatting and IO Optimizations
SPrintFOpt SPrintF; PrintFOpt PrintF;
FWriteOpt FWrite; FPutsOpt FPuts; FPrintFOpt FPrintF;
-
+ PutsOpt Puts;
+
bool Modified; // This is only used by doInitialization.
public:
static char ID; // Pass identification
- SimplifyLibCalls() : FunctionPass(&ID), StrCpy(false), StrCpyChk(true) {}
+ SimplifyLibCalls() : FunctionPass(ID), StrCpy(false), StrCpyChk(true) {
+ initializeSimplifyLibCallsPass(*PassRegistry::getPassRegistry());
+ }
void InitOptimizations();
bool runOnFunction(Function &F);
void setDoesNotAlias(Function &F, unsigned n);
bool doInitialization(Module &M);
+ void inferPrototypeAttributes(Function &F);
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.addRequired<TargetLibraryInfo>();
}
};
- char SimplifyLibCalls::ID = 0;
} // end anonymous namespace.
-INITIALIZE_PASS(SimplifyLibCalls, "simplify-libcalls",
- "Simplify well-known library calls", false, false);
+char SimplifyLibCalls::ID = 0;
+
+INITIALIZE_PASS_BEGIN(SimplifyLibCalls, "simplify-libcalls",
+ "Simplify well-known library calls", false, false)
+INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfo)
+INITIALIZE_PASS_END(SimplifyLibCalls, "simplify-libcalls",
+ "Simplify well-known library calls", false, false)
// Public interface to the Simplify LibCalls pass.
FunctionPass *llvm::createSimplifyLibCallsPass() {
Optimizations["strcat"] = &StrCat;
Optimizations["strncat"] = &StrNCat;
Optimizations["strchr"] = &StrChr;
+ Optimizations["strrchr"] = &StrRChr;
Optimizations["strcmp"] = &StrCmp;
Optimizations["strncmp"] = &StrNCmp;
Optimizations["strcpy"] = &StrCpy;
Optimizations["strncpy"] = &StrNCpy;
Optimizations["strlen"] = &StrLen;
+ Optimizations["strpbrk"] = &StrPBrk;
Optimizations["strtol"] = &StrTo;
Optimizations["strtod"] = &StrTo;
Optimizations["strtof"] = &StrTo;
Optimizations["strtoll"] = &StrTo;
Optimizations["strtold"] = &StrTo;
Optimizations["strtoull"] = &StrTo;
+ Optimizations["strspn"] = &StrSpn;
+ Optimizations["strcspn"] = &StrCSpn;
Optimizations["strstr"] = &StrStr;
Optimizations["memcmp"] = &MemCmp;
- Optimizations["memcpy"] = &MemCpy;
+ if (TLI->has(LibFunc::memcpy)) Optimizations["memcpy"] = &MemCpy;
Optimizations["memmove"] = &MemMove;
- Optimizations["memset"] = &MemSet;
+ if (TLI->has(LibFunc::memset)) Optimizations["memset"] = &MemSet;
// _chk variants of String and Memory LibCall Optimizations.
Optimizations["__strcpy_chk"] = &StrCpyChk;
Optimizations["fwrite"] = &FWrite;
Optimizations["fputs"] = &FPuts;
Optimizations["fprintf"] = &FPrintF;
+ Optimizations["puts"] = &Puts;
}
/// runOnFunction - Top level algorithm.
///
bool SimplifyLibCalls::runOnFunction(Function &F) {
+ TLI = &getAnalysis<TargetLibraryInfo>();
+
if (Optimizations.empty())
InitOptimizations();
// Set the builder to the instruction after the call.
Builder.SetInsertPoint(BB, I);
+ // Use debug location of CI for all new instructions.
+ Builder.SetCurrentDebugLocation(CI->getDebugLoc());
+
// Try to optimize this call.
- Value *Result = LCO->OptimizeCall(CI, TD, Builder);
+ Value *Result = LCO->OptimizeCall(CI, TD, TLI, Builder);
if (Result == 0) continue;
DEBUG(dbgs() << "SimplifyLibCalls simplified: " << *CI;
}
}
+
+void SimplifyLibCalls::inferPrototypeAttributes(Function &F) {
+ const FunctionType *FTy = F.getFunctionType();
+
+ StringRef Name = F.getName();
+ switch (Name[0]) {
+ case 's':
+ if (Name == "strlen") {
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setOnlyReadsMemory(F);
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "strchr" ||
+ Name == "strrchr") {
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isIntegerTy())
+ return;
+ setOnlyReadsMemory(F);
+ setDoesNotThrow(F);
+ } else if (Name == "strcpy" ||
+ Name == "stpcpy" ||
+ Name == "strcat" ||
+ Name == "strtol" ||
+ Name == "strtod" ||
+ Name == "strtof" ||
+ Name == "strtoul" ||
+ Name == "strtoll" ||
+ Name == "strtold" ||
+ Name == "strncat" ||
+ Name == "strncpy" ||
+ Name == "strtoull") {
+ if (FTy->getNumParams() < 2 ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "strxfrm") {
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "strcmp" ||
+ Name == "strspn" ||
+ Name == "strncmp" ||
+ Name == "strcspn" ||
+ Name == "strcoll" ||
+ Name == "strcasecmp" ||
+ Name == "strncasecmp") {
+ if (FTy->getNumParams() < 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setOnlyReadsMemory(F);
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "strstr" ||
+ Name == "strpbrk") {
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
+ return;
+ setOnlyReadsMemory(F);
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "strtok" ||
+ Name == "strtok_r") {
+ if (FTy->getNumParams() < 2 || !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "scanf" ||
+ Name == "setbuf" ||
+ Name == "setvbuf") {
+ if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "strdup" ||
+ Name == "strndup") {
+ if (FTy->getNumParams() < 1 || !FTy->getReturnType()->isPointerTy() ||
+ !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "stat" ||
+ Name == "sscanf" ||
+ Name == "sprintf" ||
+ Name == "statvfs") {
+ if (FTy->getNumParams() < 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "snprintf") {
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(2)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 3);
+ } else if (Name == "setitimer") {
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(1)->isPointerTy() ||
+ !FTy->getParamType(2)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ setDoesNotCapture(F, 3);
+ } else if (Name == "system") {
+ if (FTy->getNumParams() != 1 ||
+ !FTy->getParamType(0)->isPointerTy())
+ return;
+ // May throw; "system" is a valid pthread cancellation point.
+ setDoesNotCapture(F, 1);
+ }
+ break;
+ case 'm':
+ if (Name == "malloc") {
+ if (FTy->getNumParams() != 1 ||
+ !FTy->getReturnType()->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ } else if (Name == "memcmp") {
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setOnlyReadsMemory(F);
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "memchr" ||
+ Name == "memrchr") {
+ if (FTy->getNumParams() != 3)
+ return;
+ setOnlyReadsMemory(F);
+ setDoesNotThrow(F);
+ } else if (Name == "modf" ||
+ Name == "modff" ||
+ Name == "modfl" ||
+ Name == "memcpy" ||
+ Name == "memccpy" ||
+ Name == "memmove") {
+ if (FTy->getNumParams() < 2 ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "memalign") {
+ if (!FTy->getReturnType()->isPointerTy())
+ return;
+ setDoesNotAlias(F, 0);
+ } else if (Name == "mkdir" ||
+ Name == "mktime") {
+ if (FTy->getNumParams() == 0 ||
+ !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ }
+ break;
+ case 'r':
+ if (Name == "realloc") {
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getReturnType()->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "read") {
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ // May throw; "read" is a valid pthread cancellation point.
+ setDoesNotCapture(F, 2);
+ } else if (Name == "rmdir" ||
+ Name == "rewind" ||
+ Name == "remove" ||
+ Name == "realpath") {
+ if (FTy->getNumParams() < 1 ||
+ !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "rename" ||
+ Name == "readlink") {
+ if (FTy->getNumParams() < 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ }
+ break;
+ case 'w':
+ if (Name == "write") {
+ if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy())
+ return;
+ // May throw; "write" is a valid pthread cancellation point.
+ setDoesNotCapture(F, 2);
+ }
+ break;
+ case 'b':
+ if (Name == "bcopy") {
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "bcmp") {
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setOnlyReadsMemory(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "bzero") {
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ }
+ break;
+ case 'c':
+ if (Name == "calloc") {
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getReturnType()->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ } else if (Name == "chmod" ||
+ Name == "chown" ||
+ Name == "ctermid" ||
+ Name == "clearerr" ||
+ Name == "closedir") {
+ if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ }
+ break;
+ case 'a':
+ if (Name == "atoi" ||
+ Name == "atol" ||
+ Name == "atof" ||
+ Name == "atoll") {
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setOnlyReadsMemory(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "access") {
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ }
+ break;
+ case 'f':
+ if (Name == "fopen") {
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getReturnType()->isPointerTy() ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "fdopen") {
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getReturnType()->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "feof" ||
+ Name == "free" ||
+ Name == "fseek" ||
+ Name == "ftell" ||
+ Name == "fgetc" ||
+ Name == "fseeko" ||
+ Name == "ftello" ||
+ Name == "fileno" ||
+ Name == "fflush" ||
+ Name == "fclose" ||
+ Name == "fsetpos" ||
+ Name == "flockfile" ||
+ Name == "funlockfile" ||
+ Name == "ftrylockfile") {
+ if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "ferror") {
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setOnlyReadsMemory(F);
+ } else if (Name == "fputc" ||
+ Name == "fstat" ||
+ Name == "frexp" ||
+ Name == "frexpf" ||
+ Name == "frexpl" ||
+ Name == "fstatvfs") {
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "fgets") {
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(2)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 3);
+ } else if (Name == "fread" ||
+ Name == "fwrite") {
+ if (FTy->getNumParams() != 4 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(3)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 4);
+ } else if (Name == "fputs" ||
+ Name == "fscanf" ||
+ Name == "fprintf" ||
+ Name == "fgetpos") {
+ if (FTy->getNumParams() < 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ }
+ break;
+ case 'g':
+ if (Name == "getc" ||
+ Name == "getlogin_r" ||
+ Name == "getc_unlocked") {
+ if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "getenv") {
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setOnlyReadsMemory(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "gets" ||
+ Name == "getchar") {
+ setDoesNotThrow(F);
+ } else if (Name == "getitimer") {
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "getpwnam") {
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ }
+ break;
+ case 'u':
+ if (Name == "ungetc") {
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "uname" ||
+ Name == "unlink" ||
+ Name == "unsetenv") {
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "utime" ||
+ Name == "utimes") {
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ }
+ break;
+ case 'p':
+ if (Name == "putc") {
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "puts" ||
+ Name == "printf" ||
+ Name == "perror") {
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "pread" ||
+ Name == "pwrite") {
+ if (FTy->getNumParams() != 4 || !FTy->getParamType(1)->isPointerTy())
+ return;
+ // May throw; these are valid pthread cancellation points.
+ setDoesNotCapture(F, 2);
+ } else if (Name == "putchar") {
+ setDoesNotThrow(F);
+ } else if (Name == "popen") {
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getReturnType()->isPointerTy() ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "pclose") {
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ }
+ break;
+ case 'v':
+ if (Name == "vscanf") {
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "vsscanf" ||
+ Name == "vfscanf") {
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(1)->isPointerTy() ||
+ !FTy->getParamType(2)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "valloc") {
+ if (!FTy->getReturnType()->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ } else if (Name == "vprintf") {
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "vfprintf" ||
+ Name == "vsprintf") {
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "vsnprintf") {
+ if (FTy->getNumParams() != 4 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(2)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 3);
+ }
+ break;
+ case 'o':
+ if (Name == "open") {
+ if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ // May throw; "open" is a valid pthread cancellation point.
+ setDoesNotCapture(F, 1);
+ } else if (Name == "opendir") {
+ if (FTy->getNumParams() != 1 ||
+ !FTy->getReturnType()->isPointerTy() ||
+ !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ setDoesNotCapture(F, 1);
+ }
+ break;
+ case 't':
+ if (Name == "tmpfile") {
+ if (!FTy->getReturnType()->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ } else if (Name == "times") {
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ }
+ break;
+ case 'h':
+ if (Name == "htonl" ||
+ Name == "htons") {
+ setDoesNotThrow(F);
+ setDoesNotAccessMemory(F);
+ }
+ break;
+ case 'n':
+ if (Name == "ntohl" ||
+ Name == "ntohs") {
+ setDoesNotThrow(F);
+ setDoesNotAccessMemory(F);
+ }
+ break;
+ case 'l':
+ if (Name == "lstat") {
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "lchown") {
+ if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ }
+ break;
+ case 'q':
+ if (Name == "qsort") {
+ if (FTy->getNumParams() != 4 || !FTy->getParamType(3)->isPointerTy())
+ return;
+ // May throw; places call through function pointer.
+ setDoesNotCapture(F, 4);
+ }
+ break;
+ case '_':
+ if (Name == "__strdup" ||
+ Name == "__strndup") {
+ if (FTy->getNumParams() < 1 ||
+ !FTy->getReturnType()->isPointerTy() ||
+ !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "__strtok_r") {
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "_IO_getc") {
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "_IO_putc") {
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ }
+ break;
+ case 1:
+ if (Name == "\1__isoc99_scanf") {
+ if (FTy->getNumParams() < 1 ||
+ !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "\1stat64" ||
+ Name == "\1lstat64" ||
+ Name == "\1statvfs64" ||
+ Name == "\1__isoc99_sscanf") {
+ if (FTy->getNumParams() < 1 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "\1fopen64") {
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getReturnType()->isPointerTy() ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "\1fseeko64" ||
+ Name == "\1ftello64") {
+ if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "\1tmpfile64") {
+ if (!FTy->getReturnType()->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ } else if (Name == "\1fstat64" ||
+ Name == "\1fstatvfs64") {
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "\1open64") {
+ if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ // May throw; "open" is a valid pthread cancellation point.
+ setDoesNotCapture(F, 1);
+ }
+ break;
+ }
+}
+
/// doInitialization - Add attributes to well-known functions.
///
bool SimplifyLibCalls::doInitialization(Module &M) {
Modified = false;
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
Function &F = *I;
- if (!F.isDeclaration())
- continue;
-
- if (!F.hasName())
- continue;
-
- const FunctionType *FTy = F.getFunctionType();
-
- StringRef Name = F.getName();
- switch (Name[0]) {
- case 's':
- if (Name == "strlen") {
- if (FTy->getNumParams() != 1 ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- setOnlyReadsMemory(F);
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "strchr" ||
- Name == "strrchr") {
- if (FTy->getNumParams() != 2 ||
- !FTy->getParamType(0)->isPointerTy() ||
- !FTy->getParamType(1)->isIntegerTy())
- continue;
- setOnlyReadsMemory(F);
- setDoesNotThrow(F);
- } else if (Name == "strcpy" ||
- Name == "stpcpy" ||
- Name == "strcat" ||
- Name == "strtol" ||
- Name == "strtod" ||
- Name == "strtof" ||
- Name == "strtoul" ||
- Name == "strtoll" ||
- Name == "strtold" ||
- Name == "strncat" ||
- Name == "strncpy" ||
- Name == "strtoull") {
- if (FTy->getNumParams() < 2 ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 2);
- } else if (Name == "strxfrm") {
- if (FTy->getNumParams() != 3 ||
- !FTy->getParamType(0)->isPointerTy() ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "strcmp" ||
- Name == "strspn" ||
- Name == "strncmp" ||
- Name == "strcspn" ||
- Name == "strcoll" ||
- Name == "strcasecmp" ||
- Name == "strncasecmp") {
- if (FTy->getNumParams() < 2 ||
- !FTy->getParamType(0)->isPointerTy() ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setOnlyReadsMemory(F);
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "strstr" ||
- Name == "strpbrk") {
- if (FTy->getNumParams() != 2 ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setOnlyReadsMemory(F);
- setDoesNotThrow(F);
- setDoesNotCapture(F, 2);
- } else if (Name == "strtok" ||
- Name == "strtok_r") {
- if (FTy->getNumParams() < 2 ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 2);
- } else if (Name == "scanf" ||
- Name == "setbuf" ||
- Name == "setvbuf") {
- if (FTy->getNumParams() < 1 ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "strdup" ||
- Name == "strndup") {
- if (FTy->getNumParams() < 1 ||
- !FTy->getReturnType()->isPointerTy() ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- setDoesNotCapture(F, 1);
- } else if (Name == "stat" ||
- Name == "sscanf" ||
- Name == "sprintf" ||
- Name == "statvfs") {
- if (FTy->getNumParams() < 2 ||
- !FTy->getParamType(0)->isPointerTy() ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "snprintf") {
- if (FTy->getNumParams() != 3 ||
- !FTy->getParamType(0)->isPointerTy() ||
- !FTy->getParamType(2)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 3);
- } else if (Name == "setitimer") {
- if (FTy->getNumParams() != 3 ||
- !FTy->getParamType(1)->isPointerTy() ||
- !FTy->getParamType(2)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 2);
- setDoesNotCapture(F, 3);
- } else if (Name == "system") {
- if (FTy->getNumParams() != 1 ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- // May throw; "system" is a valid pthread cancellation point.
- setDoesNotCapture(F, 1);
- }
- break;
- case 'm':
- if (Name == "malloc") {
- if (FTy->getNumParams() != 1 ||
- !FTy->getReturnType()->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- } else if (Name == "memcmp") {
- if (FTy->getNumParams() != 3 ||
- !FTy->getParamType(0)->isPointerTy() ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setOnlyReadsMemory(F);
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "memchr" ||
- Name == "memrchr") {
- if (FTy->getNumParams() != 3)
- continue;
- setOnlyReadsMemory(F);
- setDoesNotThrow(F);
- } else if (Name == "modf" ||
- Name == "modff" ||
- Name == "modfl" ||
- Name == "memcpy" ||
- Name == "memccpy" ||
- Name == "memmove") {
- if (FTy->getNumParams() < 2 ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 2);
- } else if (Name == "memalign") {
- if (!FTy->getReturnType()->isPointerTy())
- continue;
- setDoesNotAlias(F, 0);
- } else if (Name == "mkdir" ||
- Name == "mktime") {
- if (FTy->getNumParams() == 0 ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- }
- break;
- case 'r':
- if (Name == "realloc") {
- if (FTy->getNumParams() != 2 ||
- !FTy->getParamType(0)->isPointerTy() ||
- !FTy->getReturnType()->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- setDoesNotCapture(F, 1);
- } else if (Name == "read") {
- if (FTy->getNumParams() != 3 ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- // May throw; "read" is a valid pthread cancellation point.
- setDoesNotCapture(F, 2);
- } else if (Name == "rmdir" ||
- Name == "rewind" ||
- Name == "remove" ||
- Name == "realpath") {
- if (FTy->getNumParams() < 1 ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "rename" ||
- Name == "readlink") {
- if (FTy->getNumParams() < 2 ||
- !FTy->getParamType(0)->isPointerTy() ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- }
- break;
- case 'w':
- if (Name == "write") {
- if (FTy->getNumParams() != 3 ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- // May throw; "write" is a valid pthread cancellation point.
- setDoesNotCapture(F, 2);
- }
- break;
- case 'b':
- if (Name == "bcopy") {
- if (FTy->getNumParams() != 3 ||
- !FTy->getParamType(0)->isPointerTy() ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "bcmp") {
- if (FTy->getNumParams() != 3 ||
- !FTy->getParamType(0)->isPointerTy() ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setOnlyReadsMemory(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "bzero") {
- if (FTy->getNumParams() != 2 ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- }
- break;
- case 'c':
- if (Name == "calloc") {
- if (FTy->getNumParams() != 2 ||
- !FTy->getReturnType()->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- } else if (Name == "chmod" ||
- Name == "chown" ||
- Name == "ctermid" ||
- Name == "clearerr" ||
- Name == "closedir") {
- if (FTy->getNumParams() == 0 ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- }
- break;
- case 'a':
- if (Name == "atoi" ||
- Name == "atol" ||
- Name == "atof" ||
- Name == "atoll") {
- if (FTy->getNumParams() != 1 ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setOnlyReadsMemory(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "access") {
- if (FTy->getNumParams() != 2 ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- }
- break;
- case 'f':
- if (Name == "fopen") {
- if (FTy->getNumParams() != 2 ||
- !FTy->getReturnType()->isPointerTy() ||
- !FTy->getParamType(0)->isPointerTy() ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "fdopen") {
- if (FTy->getNumParams() != 2 ||
- !FTy->getReturnType()->isPointerTy() ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- setDoesNotCapture(F, 2);
- } else if (Name == "feof" ||
- Name == "free" ||
- Name == "fseek" ||
- Name == "ftell" ||
- Name == "fgetc" ||
- Name == "fseeko" ||
- Name == "ftello" ||
- Name == "fileno" ||
- Name == "fflush" ||
- Name == "fclose" ||
- Name == "fsetpos" ||
- Name == "flockfile" ||
- Name == "funlockfile" ||
- Name == "ftrylockfile") {
- if (FTy->getNumParams() == 0 ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "ferror") {
- if (FTy->getNumParams() != 1 ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setOnlyReadsMemory(F);
- } else if (Name == "fputc" ||
- Name == "fstat" ||
- Name == "frexp" ||
- Name == "frexpf" ||
- Name == "frexpl" ||
- Name == "fstatvfs") {
- if (FTy->getNumParams() != 2 ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 2);
- } else if (Name == "fgets") {
- if (FTy->getNumParams() != 3 ||
- !FTy->getParamType(0)->isPointerTy() ||
- !FTy->getParamType(2)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 3);
- } else if (Name == "fread" ||
- Name == "fwrite") {
- if (FTy->getNumParams() != 4 ||
- !FTy->getParamType(0)->isPointerTy() ||
- !FTy->getParamType(3)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 4);
- } else if (Name == "fputs" ||
- Name == "fscanf" ||
- Name == "fprintf" ||
- Name == "fgetpos") {
- if (FTy->getNumParams() < 2 ||
- !FTy->getParamType(0)->isPointerTy() ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- }
- break;
- case 'g':
- if (Name == "getc" ||
- Name == "getlogin_r" ||
- Name == "getc_unlocked") {
- if (FTy->getNumParams() == 0 ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "getenv") {
- if (FTy->getNumParams() != 1 ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setOnlyReadsMemory(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "gets" ||
- Name == "getchar") {
- setDoesNotThrow(F);
- } else if (Name == "getitimer") {
- if (FTy->getNumParams() != 2 ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 2);
- } else if (Name == "getpwnam") {
- if (FTy->getNumParams() != 1 ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- }
- break;
- case 'u':
- if (Name == "ungetc") {
- if (FTy->getNumParams() != 2 ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 2);
- } else if (Name == "uname" ||
- Name == "unlink" ||
- Name == "unsetenv") {
- if (FTy->getNumParams() != 1 ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "utime" ||
- Name == "utimes") {
- if (FTy->getNumParams() != 2 ||
- !FTy->getParamType(0)->isPointerTy() ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- }
- break;
- case 'p':
- if (Name == "putc") {
- if (FTy->getNumParams() != 2 ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 2);
- } else if (Name == "puts" ||
- Name == "printf" ||
- Name == "perror") {
- if (FTy->getNumParams() != 1 ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "pread" ||
- Name == "pwrite") {
- if (FTy->getNumParams() != 4 ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- // May throw; these are valid pthread cancellation points.
- setDoesNotCapture(F, 2);
- } else if (Name == "putchar") {
- setDoesNotThrow(F);
- } else if (Name == "popen") {
- if (FTy->getNumParams() != 2 ||
- !FTy->getReturnType()->isPointerTy() ||
- !FTy->getParamType(0)->isPointerTy() ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "pclose") {
- if (FTy->getNumParams() != 1 ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- }
- break;
- case 'v':
- if (Name == "vscanf") {
- if (FTy->getNumParams() != 2 ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "vsscanf" ||
- Name == "vfscanf") {
- if (FTy->getNumParams() != 3 ||
- !FTy->getParamType(1)->isPointerTy() ||
- !FTy->getParamType(2)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "valloc") {
- if (!FTy->getReturnType()->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- } else if (Name == "vprintf") {
- if (FTy->getNumParams() != 2 ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "vfprintf" ||
- Name == "vsprintf") {
- if (FTy->getNumParams() != 3 ||
- !FTy->getParamType(0)->isPointerTy() ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "vsnprintf") {
- if (FTy->getNumParams() != 4 ||
- !FTy->getParamType(0)->isPointerTy() ||
- !FTy->getParamType(2)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 3);
- }
- break;
- case 'o':
- if (Name == "open") {
- if (FTy->getNumParams() < 2 ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- // May throw; "open" is a valid pthread cancellation point.
- setDoesNotCapture(F, 1);
- } else if (Name == "opendir") {
- if (FTy->getNumParams() != 1 ||
- !FTy->getReturnType()->isPointerTy() ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- setDoesNotCapture(F, 1);
- }
- break;
- case 't':
- if (Name == "tmpfile") {
- if (!FTy->getReturnType()->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- } else if (Name == "times") {
- if (FTy->getNumParams() != 1 ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- }
- break;
- case 'h':
- if (Name == "htonl" ||
- Name == "htons") {
- setDoesNotThrow(F);
- setDoesNotAccessMemory(F);
- }
- break;
- case 'n':
- if (Name == "ntohl" ||
- Name == "ntohs") {
- setDoesNotThrow(F);
- setDoesNotAccessMemory(F);
- }
- break;
- case 'l':
- if (Name == "lstat") {
- if (FTy->getNumParams() != 2 ||
- !FTy->getParamType(0)->isPointerTy() ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "lchown") {
- if (FTy->getNumParams() != 3 ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- }
- break;
- case 'q':
- if (Name == "qsort") {
- if (FTy->getNumParams() != 4 ||
- !FTy->getParamType(3)->isPointerTy())
- continue;
- // May throw; places call through function pointer.
- setDoesNotCapture(F, 4);
- }
- break;
- case '_':
- if (Name == "__strdup" ||
- Name == "__strndup") {
- if (FTy->getNumParams() < 1 ||
- !FTy->getReturnType()->isPointerTy() ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- setDoesNotCapture(F, 1);
- } else if (Name == "__strtok_r") {
- if (FTy->getNumParams() != 3 ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 2);
- } else if (Name == "_IO_getc") {
- if (FTy->getNumParams() != 1 ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "_IO_putc") {
- if (FTy->getNumParams() != 2 ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 2);
- }
- break;
- case 1:
- if (Name == "\1__isoc99_scanf") {
- if (FTy->getNumParams() < 1 ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "\1stat64" ||
- Name == "\1lstat64" ||
- Name == "\1statvfs64" ||
- Name == "\1__isoc99_sscanf") {
- if (FTy->getNumParams() < 1 ||
- !FTy->getParamType(0)->isPointerTy() ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "\1fopen64") {
- if (FTy->getNumParams() != 2 ||
- !FTy->getReturnType()->isPointerTy() ||
- !FTy->getParamType(0)->isPointerTy() ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "\1fseeko64" ||
- Name == "\1ftello64") {
- if (FTy->getNumParams() == 0 ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "\1tmpfile64") {
- if (!FTy->getReturnType()->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- } else if (Name == "\1fstat64" ||
- Name == "\1fstatvfs64") {
- if (FTy->getNumParams() != 2 ||
- !FTy->getParamType(1)->isPointerTy())
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 2);
- } else if (Name == "\1open64") {
- if (FTy->getNumParams() < 2 ||
- !FTy->getParamType(0)->isPointerTy())
- continue;
- // May throw; "open" is a valid pthread cancellation point.
- setDoesNotCapture(F, 1);
- }
- break;
- }
+ if (F.isDeclaration() && F.hasName())
+ inferPrototypeAttributes(F);
}
return Modified;
}
// * pow(sqrt(x),y) -> pow(x,y*0.5)
// * pow(pow(x,y),z)-> pow(x,y*z)
//
-// puts:
-// * puts("") -> putchar('\n')
-//
// round, roundf, roundl:
// * round(cnst) -> cnst'
//
// stpcpy:
// * stpcpy(str, "literal") ->
// llvm.memcpy(str,"literal",strlen("literal")+1,1)
-// strrchr:
-// * strrchr(s,c) -> reverse_offset_of_in(c,s)
-// (if c is a constant integer and s is a constant string)
-// * strrchr(s1,0) -> strchr(s1,0)
-//
-// strpbrk:
-// * strpbrk(s,a) -> offset_in_for(s,a)
-// (if s and a are both constant strings)
-// * strpbrk(s,"") -> 0
-// * strpbrk(s,a) -> strchr(s,a[0]) (if a is constant string of length 1)
-//
-// strspn, strcspn:
-// * strspn(s,a) -> const_int (if both args are constant)
-// * strspn("",a) -> 0
-// * strspn(s,"") -> 0
-// * strcspn(s,a) -> const_int (if both args are constant)
-// * strcspn("",a) -> 0
-// * strcspn(s,"") -> strlen(a)
//
// tan, tanf, tanl:
// * tan(atan(x)) -> x