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Probably the best way to know that all getOperand() calls have been handled is to replace that API instead of updating. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101579 91177308-0d34-0410-b5e6-96231b3b80d8
502 lines
21 KiB
C++
502 lines
21 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/Type.h"
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#include "llvm/Constants.h"
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#include "llvm/Function.h"
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#include "llvm/Module.h"
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#include "llvm/Support/IRBuilder.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/LLVMContext.h"
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#include "llvm/Intrinsics.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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return B.CreateBitCast(V, B.getInt8PtrTy(), "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 TargetData *TD) {
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Module *M = B.GetInsertBlock()->getParent()->getParent();
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AttributeWithIndex AWI[2];
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AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture);
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AWI[1] = AttributeWithIndex::get(~0u, Attribute::ReadOnly |
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Attribute::NoUnwind);
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LLVMContext &Context = B.GetInsertBlock()->getContext();
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Constant *StrLen = M->getOrInsertFunction("strlen", AttrListPtr::get(AWI, 2),
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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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/// 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 TargetData *TD) {
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Module *M = B.GetInsertBlock()->getParent()->getParent();
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AttributeWithIndex AWI =
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AttributeWithIndex::get(~0u, Attribute::ReadOnly | Attribute::NoUnwind);
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const Type *I8Ptr = B.getInt8PtrTy();
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const Type *I32Ty = B.getInt32Ty();
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Constant *StrChr = M->getOrInsertFunction("strchr", AttrListPtr::get(&AWI, 1),
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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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/// 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 TargetData *TD, StringRef Name) {
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Module *M = B.GetInsertBlock()->getParent()->getParent();
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AttributeWithIndex AWI[2];
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AWI[0] = AttributeWithIndex::get(2, Attribute::NoCapture);
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AWI[1] = AttributeWithIndex::get(~0u, Attribute::NoUnwind);
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const Type *I8Ptr = B.getInt8PtrTy();
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Value *StrCpy = M->getOrInsertFunction(Name, AttrListPtr::get(AWI, 2),
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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 TargetData *TD, StringRef Name) {
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Module *M = B.GetInsertBlock()->getParent()->getParent();
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AttributeWithIndex AWI[2];
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AWI[0] = AttributeWithIndex::get(2, Attribute::NoCapture);
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AWI[1] = AttributeWithIndex::get(~0u, Attribute::NoUnwind);
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const Type *I8Ptr = B.getInt8PtrTy();
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Value *StrNCpy = M->getOrInsertFunction(Name, AttrListPtr::get(AWI, 2),
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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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/// EmitMemCpy - Emit a call to the memcpy function to the builder. This always
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/// expects that Len has type 'intptr_t' and Dst/Src are pointers.
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Value *llvm::EmitMemCpy(Value *Dst, Value *Src, Value *Len, unsigned Align,
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bool isVolatile, IRBuilder<> &B, const TargetData *TD) {
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Module *M = B.GetInsertBlock()->getParent()->getParent();
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const Type *ArgTys[3] = { Dst->getType(), Src->getType(), Len->getType() };
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Value *MemCpy = Intrinsic::getDeclaration(M, Intrinsic::memcpy, ArgTys, 3);
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Dst = CastToCStr(Dst, B);
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Src = CastToCStr(Src, B);
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return B.CreateCall5(MemCpy, Dst, Src, Len,
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ConstantInt::get(B.getInt32Ty(), Align),
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ConstantInt::get(B.getInt1Ty(), isVolatile));
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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 TargetData *TD) {
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Module *M = B.GetInsertBlock()->getParent()->getParent();
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AttributeWithIndex AWI;
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AWI = AttributeWithIndex::get(~0u, 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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AttrListPtr::get(&AWI, 1),
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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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/// EmitMemMove - Emit a call to the memmove function to the builder. This
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/// always expects that the size has type 'intptr_t' and Dst/Src are pointers.
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Value *llvm::EmitMemMove(Value *Dst, Value *Src, Value *Len, unsigned Align,
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bool isVolatile, IRBuilder<> &B, const TargetData *TD) {
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Module *M = B.GetInsertBlock()->getParent()->getParent();
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LLVMContext &Context = B.GetInsertBlock()->getContext();
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const Type *ArgTys[3] = { Dst->getType(), Src->getType(),
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TD->getIntPtrType(Context) };
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Value *MemMove = Intrinsic::getDeclaration(M, Intrinsic::memmove, ArgTys, 3);
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Dst = CastToCStr(Dst, B);
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Src = CastToCStr(Src, B);
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Value *A = ConstantInt::get(B.getInt32Ty(), Align);
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Value *Vol = ConstantInt::get(B.getInt1Ty(), isVolatile);
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return B.CreateCall5(MemMove, Dst, Src, Len, A, Vol);
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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 TargetData *TD) {
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Module *M = B.GetInsertBlock()->getParent()->getParent();
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AttributeWithIndex AWI;
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AWI = AttributeWithIndex::get(~0u, Attribute::ReadOnly | Attribute::NoUnwind);
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LLVMContext &Context = B.GetInsertBlock()->getContext();
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Value *MemChr = M->getOrInsertFunction("memchr", AttrListPtr::get(&AWI, 1),
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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 TargetData *TD) {
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Module *M = B.GetInsertBlock()->getParent()->getParent();
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AttributeWithIndex AWI[3];
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AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture);
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AWI[1] = AttributeWithIndex::get(2, Attribute::NoCapture);
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AWI[2] = AttributeWithIndex::get(~0u, Attribute::ReadOnly |
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Attribute::NoUnwind);
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LLVMContext &Context = B.GetInsertBlock()->getContext();
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Value *MemCmp = M->getOrInsertFunction("memcmp", AttrListPtr::get(AWI, 3),
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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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/// EmitMemSet - Emit a call to the memset function
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Value *llvm::EmitMemSet(Value *Dst, Value *Val, Value *Len, bool isVolatile,
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IRBuilder<> &B, const TargetData *TD) {
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Module *M = B.GetInsertBlock()->getParent()->getParent();
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Intrinsic::ID IID = Intrinsic::memset;
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const Type *Tys[2] = { Dst->getType(), Len->getType() };
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Value *MemSet = Intrinsic::getDeclaration(M, IID, Tys, 2);
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Value *Align = ConstantInt::get(B.getInt32Ty(), 1);
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Value *Vol = ConstantInt::get(B.getInt1Ty(), isVolatile);
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return B.CreateCall5(MemSet, CastToCStr(Dst, B), Val, Len, Align, Vol);
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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, const char *Name,
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IRBuilder<> &B, const AttrListPtr &Attrs) {
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char NameBuffer[20];
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if (!Op->getType()->isDoubleTy()) {
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// If we need to add a suffix, copy into NameBuffer.
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unsigned NameLen = strlen(Name);
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assert(NameLen < sizeof(NameBuffer)-2);
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memcpy(NameBuffer, Name, NameLen);
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if (Op->getType()->isFloatTy())
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NameBuffer[NameLen] = 'f'; // floorf
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else
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NameBuffer[NameLen] = 'l'; // floorl
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NameBuffer[NameLen+1] = 0;
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Name = NameBuffer;
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}
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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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/// 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 TargetData *TD) {
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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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void llvm::EmitPutS(Value *Str, IRBuilder<> &B, const TargetData *TD) {
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Module *M = B.GetInsertBlock()->getParent()->getParent();
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AttributeWithIndex AWI[2];
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AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture);
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AWI[1] = AttributeWithIndex::get(~0u, Attribute::NoUnwind);
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Value *PutS = M->getOrInsertFunction("puts", AttrListPtr::get(AWI, 2),
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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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}
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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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void llvm::EmitFPutC(Value *Char, Value *File, IRBuilder<> &B,
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const TargetData *TD) {
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Module *M = B.GetInsertBlock()->getParent()->getParent();
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AttributeWithIndex AWI[2];
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AWI[0] = AttributeWithIndex::get(2, Attribute::NoCapture);
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AWI[1] = AttributeWithIndex::get(~0u, Attribute::NoUnwind);
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Constant *F;
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if (File->getType()->isPointerTy())
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F = M->getOrInsertFunction("fputc", AttrListPtr::get(AWI, 2),
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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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}
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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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void llvm::EmitFPutS(Value *Str, Value *File, IRBuilder<> &B,
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const TargetData *TD) {
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Module *M = B.GetInsertBlock()->getParent()->getParent();
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AttributeWithIndex AWI[3];
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AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture);
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AWI[1] = AttributeWithIndex::get(2, Attribute::NoCapture);
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AWI[2] = AttributeWithIndex::get(~0u, Attribute::NoUnwind);
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Constant *F;
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if (File->getType()->isPointerTy())
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F = M->getOrInsertFunction("fputs", AttrListPtr::get(AWI, 3),
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B.getInt32Ty(),
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B.getInt8PtrTy(),
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File->getType(), NULL);
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else
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F = M->getOrInsertFunction("fputs", B.getInt32Ty(),
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B.getInt8PtrTy(),
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File->getType(), NULL);
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CallInst *CI = B.CreateCall2(F, CastToCStr(Str, B), File, "fputs");
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if (const Function *Fn = dyn_cast<Function>(F->stripPointerCasts()))
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CI->setCallingConv(Fn->getCallingConv());
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}
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/// EmitFWrite - Emit a call to the fwrite function. This assumes that Ptr is
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/// a pointer, Size is an 'intptr_t', and File is a pointer to FILE.
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void llvm::EmitFWrite(Value *Ptr, Value *Size, Value *File,
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IRBuilder<> &B, const TargetData *TD) {
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Module *M = B.GetInsertBlock()->getParent()->getParent();
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AttributeWithIndex AWI[3];
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AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture);
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AWI[1] = AttributeWithIndex::get(4, Attribute::NoCapture);
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AWI[2] = AttributeWithIndex::get(~0u, Attribute::NoUnwind);
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LLVMContext &Context = B.GetInsertBlock()->getContext();
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Constant *F;
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if (File->getType()->isPointerTy())
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F = M->getOrInsertFunction("fwrite", AttrListPtr::get(AWI, 3),
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TD->getIntPtrType(Context),
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B.getInt8PtrTy(),
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TD->getIntPtrType(Context),
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TD->getIntPtrType(Context),
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File->getType(), NULL);
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else
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F = M->getOrInsertFunction("fwrite", TD->getIntPtrType(Context),
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B.getInt8PtrTy(),
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TD->getIntPtrType(Context),
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TD->getIntPtrType(Context),
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File->getType(), NULL);
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CallInst *CI = B.CreateCall4(F, CastToCStr(Ptr, B), Size,
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ConstantInt::get(TD->getIntPtrType(Context), 1), File);
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if (const Function *Fn = dyn_cast<Function>(F->stripPointerCasts()))
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CI->setCallingConv(Fn->getCallingConv());
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}
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SimplifyFortifiedLibCalls::~SimplifyFortifiedLibCalls() { }
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bool SimplifyFortifiedLibCalls::fold(CallInst *CI, const TargetData *TD) {
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// We really need TargetData for later.
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if (!TD) return false;
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this->CI = CI;
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Function *Callee = CI->getCalledFunction();
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StringRef Name = Callee->getName();
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const FunctionType *FT = Callee->getFunctionType();
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BasicBlock *BB = CI->getParent();
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LLVMContext &Context = CI->getParent()->getContext();
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IRBuilder<> B(Context);
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// Set the builder to the instruction after the call.
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B.SetInsertPoint(BB, CI);
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if (Name == "__memcpy_chk") {
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// Check if this has the right signature.
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if (FT->getNumParams() != 4 || FT->getReturnType() != FT->getParamType(0) ||
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!FT->getParamType(0)->isPointerTy() ||
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!FT->getParamType(1)->isPointerTy() ||
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FT->getParamType(2) != TD->getIntPtrType(Context) ||
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FT->getParamType(3) != TD->getIntPtrType(Context))
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return false;
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if (isFoldable(4, 3, false)) {
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|
EmitMemCpy(CI->getOperand(1), CI->getOperand(2), CI->getOperand(3),
|
|
1, false, B, TD);
|
|
replaceCall(CI->getOperand(1));
|
|
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(4, 3, false)) {
|
|
EmitMemMove(CI->getOperand(1), CI->getOperand(2), CI->getOperand(3),
|
|
1, false, B, TD);
|
|
replaceCall(CI->getOperand(1));
|
|
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(4, 3, false)) {
|
|
Value *Val = B.CreateIntCast(CI->getOperand(2), B.getInt8Ty(),
|
|
false);
|
|
EmitMemSet(CI->getOperand(1), Val, CI->getOperand(3), false, B, TD);
|
|
replaceCall(CI->getOperand(1));
|
|
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(3, 2, true)) {
|
|
Value *Ret = EmitStrCpy(CI->getOperand(1), CI->getOperand(2), B, TD,
|
|
Name.substr(2, 6));
|
|
replaceCall(Ret);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
if (Name == "__strncpy_chk" || Name == "__stpncpy_chk") {
|
|
// Check if this has the right signature.
|
|
if (FT->getNumParams() != 4 || FT->getReturnType() != FT->getParamType(0) ||
|
|
FT->getParamType(0) != FT->getParamType(1) ||
|
|
FT->getParamType(0) != Type::getInt8PtrTy(Context) ||
|
|
!FT->getParamType(2)->isIntegerTy() ||
|
|
FT->getParamType(3) != TD->getIntPtrType(Context))
|
|
return false;
|
|
|
|
if (isFoldable(4, 3, false)) {
|
|
Value *Ret = EmitStrNCpy(CI->getOperand(1), CI->getOperand(2),
|
|
CI->getOperand(3), B, TD, Name.substr(2, 7));
|
|
replaceCall(Ret);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
if (Name == "__strcat_chk") {
|
|
return false;
|
|
}
|
|
|
|
if (Name == "__strncat_chk") {
|
|
return false;
|
|
}
|
|
|
|
return false;
|
|
}
|