1 files changed, 0 insertions, 1012 deletions

diff --git a/contrib/llvm/lib/Analysis/MemoryBuiltins.cpp b/contrib/llvm/lib/Analysis/MemoryBuiltins.cpp
deleted file mode 100644
index 729dad463657..000000000000
--- a/contrib/llvm/lib/Analysis/MemoryBuiltins.cpp
+++ /dev/null
@@ -1,1012 +0,0 @@
-//===- MemoryBuiltins.cpp - Identify calls to memory builtins -------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// This family of functions identifies calls to builtin functions that allocate
-// or free memory.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Analysis/MemoryBuiltins.h"
-#include "llvm/ADT/APInt.h"
-#include "llvm/ADT/None.h"
-#include "llvm/ADT/Optional.h"
-#include "llvm/ADT/STLExtras.h"
-#include "llvm/ADT/Statistic.h"
-#include "llvm/ADT/StringRef.h"
-#include "llvm/Analysis/TargetFolder.h"
-#include "llvm/Analysis/TargetLibraryInfo.h"
-#include "llvm/Analysis/Utils/Local.h"
-#include "llvm/Analysis/ValueTracking.h"
-#include "llvm/IR/Argument.h"
-#include "llvm/IR/Attributes.h"
-#include "llvm/IR/Constants.h"
-#include "llvm/IR/DataLayout.h"
-#include "llvm/IR/DerivedTypes.h"
-#include "llvm/IR/Function.h"
-#include "llvm/IR/GlobalAlias.h"
-#include "llvm/IR/GlobalVariable.h"
-#include "llvm/IR/Instruction.h"
-#include "llvm/IR/Instructions.h"
-#include "llvm/IR/IntrinsicInst.h"
-#include "llvm/IR/Operator.h"
-#include "llvm/IR/Type.h"
-#include "llvm/IR/Value.h"
-#include "llvm/Support/Casting.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Support/MathExtras.h"
-#include "llvm/Support/raw_ostream.h"
-#include <cassert>
-#include <cstdint>
-#include <iterator>
-#include <utility>
-
-using namespace llvm;
-
-#define DEBUG_TYPE "memory-builtins"
-
-enum AllocType : uint8_t {
-  OpNewLike          = 1<<0, // allocates; never returns null
-  MallocLike         = 1<<1 | OpNewLike, // allocates; may return null
-  CallocLike         = 1<<2, // allocates + bzero
-  ReallocLike        = 1<<3, // reallocates
-  StrDupLike         = 1<<4,
-  MallocOrCallocLike = MallocLike | CallocLike,
-  AllocLike          = MallocLike | CallocLike | StrDupLike,
-  AnyAlloc           = AllocLike | ReallocLike
-};
-
-struct AllocFnsTy {
-  AllocType AllocTy;
-  unsigned NumParams;
-  // First and Second size parameters (or -1 if unused)
-  int FstParam, SndParam;
-};
-
-// FIXME: certain users need more information. E.g., SimplifyLibCalls needs to
-// know which functions are nounwind, noalias, nocapture parameters, etc.
-static const std::pair<LibFunc, AllocFnsTy> AllocationFnData[] = {
-  {LibFunc_malloc,              {MallocLike,  1, 0,  -1}},
-  {LibFunc_valloc,              {MallocLike,  1, 0,  -1}},
-  {LibFunc_Znwj,                {OpNewLike,   1, 0,  -1}}, // new(unsigned int)
-  {LibFunc_ZnwjRKSt9nothrow_t,  {MallocLike,  2, 0,  -1}}, // new(unsigned int, nothrow)
-  {LibFunc_ZnwjSt11align_val_t, {OpNewLike,   2, 0,  -1}}, // new(unsigned int, align_val_t)
-  {LibFunc_ZnwjSt11align_val_tRKSt9nothrow_t, // new(unsigned int, align_val_t, nothrow)
-                                {MallocLike,  3, 0,  -1}},
-  {LibFunc_Znwm,                {OpNewLike,   1, 0,  -1}}, // new(unsigned long)
-  {LibFunc_ZnwmRKSt9nothrow_t,  {MallocLike,  2, 0,  -1}}, // new(unsigned long, nothrow)
-  {LibFunc_ZnwmSt11align_val_t, {OpNewLike,   2, 0,  -1}}, // new(unsigned long, align_val_t)
-  {LibFunc_ZnwmSt11align_val_tRKSt9nothrow_t, // new(unsigned long, align_val_t, nothrow)
-                                {MallocLike,  3, 0,  -1}},
-  {LibFunc_Znaj,                {OpNewLike,   1, 0,  -1}}, // new[](unsigned int)
-  {LibFunc_ZnajRKSt9nothrow_t,  {MallocLike,  2, 0,  -1}}, // new[](unsigned int, nothrow)
-  {LibFunc_ZnajSt11align_val_t, {OpNewLike,   2, 0,  -1}}, // new[](unsigned int, align_val_t)
-  {LibFunc_ZnajSt11align_val_tRKSt9nothrow_t, // new[](unsigned int, align_val_t, nothrow)
-                                {MallocLike,  3, 0,  -1}},
-  {LibFunc_Znam,                {OpNewLike,   1, 0,  -1}}, // new[](unsigned long)
-  {LibFunc_ZnamRKSt9nothrow_t,  {MallocLike,  2, 0,  -1}}, // new[](unsigned long, nothrow)
-  {LibFunc_ZnamSt11align_val_t, {OpNewLike,   2, 0,  -1}}, // new[](unsigned long, align_val_t)
-  {LibFunc_ZnamSt11align_val_tRKSt9nothrow_t, // new[](unsigned long, align_val_t, nothrow)
-                                 {MallocLike,  3, 0,  -1}},
-  {LibFunc_msvc_new_int,         {OpNewLike,   1, 0,  -1}}, // new(unsigned int)
-  {LibFunc_msvc_new_int_nothrow, {MallocLike,  2, 0,  -1}}, // new(unsigned int, nothrow)
-  {LibFunc_msvc_new_longlong,         {OpNewLike,   1, 0,  -1}}, // new(unsigned long long)
-  {LibFunc_msvc_new_longlong_nothrow, {MallocLike,  2, 0,  -1}}, // new(unsigned long long, nothrow)
-  {LibFunc_msvc_new_array_int,         {OpNewLike,   1, 0,  -1}}, // new[](unsigned int)
-  {LibFunc_msvc_new_array_int_nothrow, {MallocLike,  2, 0,  -1}}, // new[](unsigned int, nothrow)
-  {LibFunc_msvc_new_array_longlong,         {OpNewLike,   1, 0,  -1}}, // new[](unsigned long long)
-  {LibFunc_msvc_new_array_longlong_nothrow, {MallocLike,  2, 0,  -1}}, // new[](unsigned long long, nothrow)
-  {LibFunc_calloc,              {CallocLike,  2, 0,   1}},
-  {LibFunc_realloc,             {ReallocLike, 2, 1,  -1}},
-  {LibFunc_reallocf,            {ReallocLike, 2, 1,  -1}},
-  {LibFunc_strdup,              {StrDupLike,  1, -1, -1}},
-  {LibFunc_strndup,             {StrDupLike,  2, 1,  -1}}
-  // TODO: Handle "int posix_memalign(void **, size_t, size_t)"
-};
-
-static const Function *getCalledFunction(const Value *V, bool LookThroughBitCast,
-                                         bool &IsNoBuiltin) {
-  // Don't care about intrinsics in this case.
-  if (isa<IntrinsicInst>(V))
-    return nullptr;
-
-  if (LookThroughBitCast)
-    V = V->stripPointerCasts();
-
-  ImmutableCallSite CS(V);
-  if (!CS.getInstruction())
-    return nullptr;
-
-  IsNoBuiltin = CS.isNoBuiltin();
-
-  if (const Function *Callee = CS.getCalledFunction())
-    return Callee;
-  return nullptr;
-}
-
-/// Returns the allocation data for the given value if it's either a call to a
-/// known allocation function, or a call to a function with the allocsize
-/// attribute.
-static Optional<AllocFnsTy>
-getAllocationDataForFunction(const Function *Callee, AllocType AllocTy,
-                             const TargetLibraryInfo *TLI) {
-  // Make sure that the function is available.
-  StringRef FnName = Callee->getName();
-  LibFunc TLIFn;
-  if (!TLI || !TLI->getLibFunc(FnName, TLIFn) || !TLI->has(TLIFn))
-    return None;
-
-  const auto *Iter = find_if(
-      AllocationFnData, [TLIFn](const std::pair<LibFunc, AllocFnsTy> &P) {
-        return P.first == TLIFn;
-      });
-
-  if (Iter == std::end(AllocationFnData))
-    return None;
-
-  const AllocFnsTy *FnData = &Iter->second;
-  if ((FnData->AllocTy & AllocTy) != FnData->AllocTy)
-    return None;
-
-  // Check function prototype.
-  int FstParam = FnData->FstParam;
-  int SndParam = FnData->SndParam;
-  FunctionType *FTy = Callee->getFunctionType();
-
-  if (FTy->getReturnType() == Type::getInt8PtrTy(FTy->getContext()) &&
-      FTy->getNumParams() == FnData->NumParams &&
-      (FstParam < 0 ||
-       (FTy->getParamType(FstParam)->isIntegerTy(32) ||
-        FTy->getParamType(FstParam)->isIntegerTy(64))) &&
-      (SndParam < 0 ||
-       FTy->getParamType(SndParam)->isIntegerTy(32) ||
-       FTy->getParamType(SndParam)->isIntegerTy(64)))
-    return *FnData;
-  return None;
-}
-
-static Optional<AllocFnsTy> getAllocationData(const Value *V, AllocType AllocTy,
-                                              const TargetLibraryInfo *TLI,
-                                              bool LookThroughBitCast = false) {
-  bool IsNoBuiltinCall;
-  if (const Function *Callee =
-          getCalledFunction(V, LookThroughBitCast, IsNoBuiltinCall))
-    if (!IsNoBuiltinCall)
-      return getAllocationDataForFunction(Callee, AllocTy, TLI);
-  return None;
-}
-
-static Optional<AllocFnsTy> getAllocationSize(const Value *V,
-                                              const TargetLibraryInfo *TLI) {
-  bool IsNoBuiltinCall;
-  const Function *Callee =
-      getCalledFunction(V, /*LookThroughBitCast=*/false, IsNoBuiltinCall);
-  if (!Callee)
-    return None;
-
-  // Prefer to use existing information over allocsize. This will give us an
-  // accurate AllocTy.
-  if (!IsNoBuiltinCall)
-    if (Optional<AllocFnsTy> Data =
-            getAllocationDataForFunction(Callee, AnyAlloc, TLI))
-      return Data;
-
-  Attribute Attr = Callee->getFnAttribute(Attribute::AllocSize);
-  if (Attr == Attribute())
-    return None;
-
-  std::pair<unsigned, Optional<unsigned>> Args = Attr.getAllocSizeArgs();
-
-  AllocFnsTy Result;
-  // Because allocsize only tells us how many bytes are allocated, we're not
-  // really allowed to assume anything, so we use MallocLike.
-  Result.AllocTy = MallocLike;
-  Result.NumParams = Callee->getNumOperands();
-  Result.FstParam = Args.first;
-  Result.SndParam = Args.second.getValueOr(-1);
-  return Result;
-}
-
-static bool hasNoAliasAttr(const Value *V, bool LookThroughBitCast) {
-  ImmutableCallSite CS(LookThroughBitCast ? V->stripPointerCasts() : V);
-  return CS && CS.hasRetAttr(Attribute::NoAlias);
-}
-
-/// Tests if a value is a call or invoke to a library function that
-/// allocates or reallocates memory (either malloc, calloc, realloc, or strdup
-/// like).
-bool llvm::isAllocationFn(const Value *V, const TargetLibraryInfo *TLI,
-                          bool LookThroughBitCast) {
-  return getAllocationData(V, AnyAlloc, TLI, LookThroughBitCast).hasValue();
-}
-
-/// Tests if a value is a call or invoke to a function that returns a
-/// NoAlias pointer (including malloc/calloc/realloc/strdup-like functions).
-bool llvm::isNoAliasFn(const Value *V, const TargetLibraryInfo *TLI,
-                       bool LookThroughBitCast) {
-  // it's safe to consider realloc as noalias since accessing the original
-  // pointer is undefined behavior
-  return isAllocationFn(V, TLI, LookThroughBitCast) ||
-         hasNoAliasAttr(V, LookThroughBitCast);
-}
-
-/// Tests if a value is a call or invoke to a library function that
-/// allocates uninitialized memory (such as malloc).
-bool llvm::isMallocLikeFn(const Value *V, const TargetLibraryInfo *TLI,
-                          bool LookThroughBitCast) {
-  return getAllocationData(V, MallocLike, TLI, LookThroughBitCast).hasValue();
-}
-
-/// Tests if a value is a call or invoke to a library function that
-/// allocates zero-filled memory (such as calloc).
-bool llvm::isCallocLikeFn(const Value *V, const TargetLibraryInfo *TLI,
-                          bool LookThroughBitCast) {
-  return getAllocationData(V, CallocLike, TLI, LookThroughBitCast).hasValue();
-}
-
-/// Tests if a value is a call or invoke to a library function that
-/// allocates memory similar to malloc or calloc.
-bool llvm::isMallocOrCallocLikeFn(const Value *V, const TargetLibraryInfo *TLI,
-                                  bool LookThroughBitCast) {
-  return getAllocationData(V, MallocOrCallocLike, TLI,
-                           LookThroughBitCast).hasValue();
-}
-
-/// Tests if a value is a call or invoke to a library function that
-/// allocates memory (either malloc, calloc, or strdup like).
-bool llvm::isAllocLikeFn(const Value *V, const TargetLibraryInfo *TLI,
-                         bool LookThroughBitCast) {
-  return getAllocationData(V, AllocLike, TLI, LookThroughBitCast).hasValue();
-}
-
-/// Tests if a value is a call or invoke to a library function that
-/// reallocates memory (e.g., realloc).
-bool llvm::isReallocLikeFn(const Value *V, const TargetLibraryInfo *TLI,
-                     bool LookThroughBitCast) {
-  return getAllocationData(V, ReallocLike, TLI, LookThroughBitCast).hasValue();
-}
-
-/// Tests if a functions is a call or invoke to a library function that
-/// reallocates memory (e.g., realloc).
-bool llvm::isReallocLikeFn(const Function *F, const TargetLibraryInfo *TLI) {
-  return getAllocationDataForFunction(F, ReallocLike, TLI).hasValue();
-}
-
-/// extractMallocCall - Returns the corresponding CallInst if the instruction
-/// is a malloc call.  Since CallInst::CreateMalloc() only creates calls, we
-/// ignore InvokeInst here.
-const CallInst *llvm::extractMallocCall(const Value *I,
-                                        const TargetLibraryInfo *TLI) {
-  return isMallocLikeFn(I, TLI) ? dyn_cast<CallInst>(I) : nullptr;
-}
-
-static Value *computeArraySize(const CallInst *CI, const DataLayout &DL,
-                               const TargetLibraryInfo *TLI,
-                               bool LookThroughSExt = false) {
-  if (!CI)
-    return nullptr;
-
-  // The size of the malloc's result type must be known to determine array size.
-  Type *T = getMallocAllocatedType(CI, TLI);
-  if (!T || !T->isSized())
-    return nullptr;
-
-  unsigned ElementSize = DL.getTypeAllocSize(T);
-  if (StructType *ST = dyn_cast<StructType>(T))
-    ElementSize = DL.getStructLayout(ST)->getSizeInBytes();
-
-  // If malloc call's arg can be determined to be a multiple of ElementSize,
-  // return the multiple.  Otherwise, return NULL.
-  Value *MallocArg = CI->getArgOperand(0);
-  Value *Multiple = nullptr;
-  if (ComputeMultiple(MallocArg, ElementSize, Multiple, LookThroughSExt))
-    return Multiple;
-
-  return nullptr;
-}
-
-/// getMallocType - Returns the PointerType resulting from the malloc call.
-/// The PointerType depends on the number of bitcast uses of the malloc call:
-///   0: PointerType is the calls' return type.
-///   1: PointerType is the bitcast's result type.
-///  >1: Unique PointerType cannot be determined, return NULL.
-PointerType *llvm::getMallocType(const CallInst *CI,
-                                 const TargetLibraryInfo *TLI) {
-  assert(isMallocLikeFn(CI, TLI) && "getMallocType and not malloc call");
-
-  PointerType *MallocType = nullptr;
-  unsigned NumOfBitCastUses = 0;
-
-  // Determine if CallInst has a bitcast use.
-  for (Value::const_user_iterator UI = CI->user_begin(), E = CI->user_end();
-       UI != E;)
-    if (const BitCastInst *BCI = dyn_cast<BitCastInst>(*UI++)) {
-      MallocType = cast<PointerType>(BCI->getDestTy());
-      NumOfBitCastUses++;
-    }
-
-  // Malloc call has 1 bitcast use, so type is the bitcast's destination type.
-  if (NumOfBitCastUses == 1)
-    return MallocType;
-
-  // Malloc call was not bitcast, so type is the malloc function's return type.
-  if (NumOfBitCastUses == 0)
-    return cast<PointerType>(CI->getType());
-
-  // Type could not be determined.
-  return nullptr;
-}
-
-/// getMallocAllocatedType - Returns the Type allocated by malloc call.
-/// The Type depends on the number of bitcast uses of the malloc call:
-///   0: PointerType is the malloc calls' return type.
-///   1: PointerType is the bitcast's result type.
-///  >1: Unique PointerType cannot be determined, return NULL.
-Type *llvm::getMallocAllocatedType(const CallInst *CI,
-                                   const TargetLibraryInfo *TLI) {
-  PointerType *PT = getMallocType(CI, TLI);
-  return PT ? PT->getElementType() : nullptr;
-}
-
-/// getMallocArraySize - Returns the array size of a malloc call.  If the
-/// argument passed to malloc is a multiple of the size of the malloced type,
-/// then return that multiple.  For non-array mallocs, the multiple is
-/// constant 1.  Otherwise, return NULL for mallocs whose array size cannot be
-/// determined.
-Value *llvm::getMallocArraySize(CallInst *CI, const DataLayout &DL,
-                                const TargetLibraryInfo *TLI,
-                                bool LookThroughSExt) {
-  assert(isMallocLikeFn(CI, TLI) && "getMallocArraySize and not malloc call");
-  return computeArraySize(CI, DL, TLI, LookThroughSExt);
-}
-
-/// extractCallocCall - Returns the corresponding CallInst if the instruction
-/// is a calloc call.
-const CallInst *llvm::extractCallocCall(const Value *I,
-                                        const TargetLibraryInfo *TLI) {
-  return isCallocLikeFn(I, TLI) ? cast<CallInst>(I) : nullptr;
-}
-
-/// isLibFreeFunction - Returns true if the function is a builtin free()
-bool llvm::isLibFreeFunction(const Function *F, const LibFunc TLIFn) {
-  unsigned ExpectedNumParams;
-  if (TLIFn == LibFunc_free ||
-      TLIFn == LibFunc_ZdlPv || // operator delete(void*)
-      TLIFn == LibFunc_ZdaPv || // operator delete[](void*)
-      TLIFn == LibFunc_msvc_delete_ptr32 || // operator delete(void*)
-      TLIFn == LibFunc_msvc_delete_ptr64 || // operator delete(void*)
-      TLIFn == LibFunc_msvc_delete_array_ptr32 || // operator delete[](void*)
-      TLIFn == LibFunc_msvc_delete_array_ptr64)   // operator delete[](void*)
-    ExpectedNumParams = 1;
-  else if (TLIFn == LibFunc_ZdlPvj ||              // delete(void*, uint)
-           TLIFn == LibFunc_ZdlPvm ||              // delete(void*, ulong)
-           TLIFn == LibFunc_ZdlPvRKSt9nothrow_t || // delete(void*, nothrow)
-           TLIFn == LibFunc_ZdlPvSt11align_val_t || // delete(void*, align_val_t)
-           TLIFn == LibFunc_ZdaPvj ||              // delete[](void*, uint)
-           TLIFn == LibFunc_ZdaPvm ||              // delete[](void*, ulong)
-           TLIFn == LibFunc_ZdaPvRKSt9nothrow_t || // delete[](void*, nothrow)
-           TLIFn == LibFunc_ZdaPvSt11align_val_t || // delete[](void*, align_val_t)
-           TLIFn == LibFunc_msvc_delete_ptr32_int ||      // delete(void*, uint)
-           TLIFn == LibFunc_msvc_delete_ptr64_longlong || // delete(void*, ulonglong)
-           TLIFn == LibFunc_msvc_delete_ptr32_nothrow || // delete(void*, nothrow)
-           TLIFn == LibFunc_msvc_delete_ptr64_nothrow || // delete(void*, nothrow)
-           TLIFn == LibFunc_msvc_delete_array_ptr32_int ||      // delete[](void*, uint)
-           TLIFn == LibFunc_msvc_delete_array_ptr64_longlong || // delete[](void*, ulonglong)
-           TLIFn == LibFunc_msvc_delete_array_ptr32_nothrow || // delete[](void*, nothrow)
-           TLIFn == LibFunc_msvc_delete_array_ptr64_nothrow)   // delete[](void*, nothrow)
-    ExpectedNumParams = 2;
-  else if (TLIFn == LibFunc_ZdaPvSt11align_val_tRKSt9nothrow_t || // delete(void*, align_val_t, nothrow)
-           TLIFn == LibFunc_ZdlPvSt11align_val_tRKSt9nothrow_t) // delete[](void*, align_val_t, nothrow)
-    ExpectedNumParams = 3;
-  else
-    return false;
-
-  // Check free prototype.
-  // FIXME: workaround for PR5130, this will be obsolete when a nobuiltin
-  // attribute will exist.
-  FunctionType *FTy = F->getFunctionType();
-  if (!FTy->getReturnType()->isVoidTy())
-    return false;
-  if (FTy->getNumParams() != ExpectedNumParams)
-    return false;
-  if (FTy->getParamType(0) != Type::getInt8PtrTy(F->getContext()))
-    return false;
-
-  return true;
-}
-
-/// isFreeCall - Returns non-null if the value is a call to the builtin free()
-const CallInst *llvm::isFreeCall(const Value *I, const TargetLibraryInfo *TLI) {
-  bool IsNoBuiltinCall;
-  const Function *Callee =
-      getCalledFunction(I, /*LookThroughBitCast=*/false, IsNoBuiltinCall);
-  if (Callee == nullptr || IsNoBuiltinCall)
-    return nullptr;
-
-  StringRef FnName = Callee->getName();
-  LibFunc TLIFn;
-  if (!TLI || !TLI->getLibFunc(FnName, TLIFn) || !TLI->has(TLIFn))
-    return nullptr;
-
-  return isLibFreeFunction(Callee, TLIFn) ? dyn_cast<CallInst>(I) : nullptr;
-}
-
-
-//===----------------------------------------------------------------------===//
-//  Utility functions to compute size of objects.
-//
-static APInt getSizeWithOverflow(const SizeOffsetType &Data) {
-  if (Data.second.isNegative() || Data.first.ult(Data.second))
-    return APInt(Data.first.getBitWidth(), 0);
-  return Data.first - Data.second;
-}
-
-/// Compute the size of the object pointed by Ptr. Returns true and the
-/// object size in Size if successful, and false otherwise.
-/// If RoundToAlign is true, then Size is rounded up to the alignment of
-/// allocas, byval arguments, and global variables.
-bool llvm::getObjectSize(const Value *Ptr, uint64_t &Size, const DataLayout &DL,
-                         const TargetLibraryInfo *TLI, ObjectSizeOpts Opts) {
-  ObjectSizeOffsetVisitor Visitor(DL, TLI, Ptr->getContext(), Opts);
-  SizeOffsetType Data = Visitor.compute(const_cast<Value*>(Ptr));
-  if (!Visitor.bothKnown(Data))
-    return false;
-
-  Size = getSizeWithOverflow(Data).getZExtValue();
-  return true;
-}
-
-Value *llvm::lowerObjectSizeCall(IntrinsicInst *ObjectSize,
-                                 const DataLayout &DL,
-                                 const TargetLibraryInfo *TLI,
-                                 bool MustSucceed) {
-  assert(ObjectSize->getIntrinsicID() == Intrinsic::objectsize &&
-         "ObjectSize must be a call to llvm.objectsize!");
-
-  bool MaxVal = cast<ConstantInt>(ObjectSize->getArgOperand(1))->isZero();
-  ObjectSizeOpts EvalOptions;
-  // Unless we have to fold this to something, try to be as accurate as
-  // possible.
-  if (MustSucceed)
-    EvalOptions.EvalMode =
-        MaxVal ? ObjectSizeOpts::Mode::Max : ObjectSizeOpts::Mode::Min;
-  else
-    EvalOptions.EvalMode = ObjectSizeOpts::Mode::Exact;
-
-  EvalOptions.NullIsUnknownSize =
-      cast<ConstantInt>(ObjectSize->getArgOperand(2))->isOne();
-
-  auto *ResultType = cast<IntegerType>(ObjectSize->getType());
-  bool StaticOnly = cast<ConstantInt>(ObjectSize->getArgOperand(3))->isZero();
-  if (StaticOnly) {
-    // FIXME: Does it make sense to just return a failure value if the size won't
-    // fit in the output and `!MustSucceed`?
-    uint64_t Size;
-    if (getObjectSize(ObjectSize->getArgOperand(0), Size, DL, TLI, EvalOptions) &&
-        isUIntN(ResultType->getBitWidth(), Size))
-      return ConstantInt::get(ResultType, Size);
-  } else {
-    LLVMContext &Ctx = ObjectSize->getFunction()->getContext();
-    ObjectSizeOffsetEvaluator Eval(DL, TLI, Ctx, EvalOptions);
-    SizeOffsetEvalType SizeOffsetPair =
-        Eval.compute(ObjectSize->getArgOperand(0));
-
-    if (SizeOffsetPair != ObjectSizeOffsetEvaluator::unknown()) {
-      IRBuilder<TargetFolder> Builder(Ctx, TargetFolder(DL));
-      Builder.SetInsertPoint(ObjectSize);
-
-      // If we've outside the end of the object, then we can always access
-      // exactly 0 bytes.
-      Value *ResultSize =
-          Builder.CreateSub(SizeOffsetPair.first, SizeOffsetPair.second);
-      Value *UseZero =
-          Builder.CreateICmpULT(SizeOffsetPair.first, SizeOffsetPair.second);
-      return Builder.CreateSelect(UseZero, ConstantInt::get(ResultType, 0),
-                                  ResultSize);
-    }
-  }
-
-  if (!MustSucceed)
-    return nullptr;
-
-  return ConstantInt::get(ResultType, MaxVal ? -1ULL : 0);
-}
-
-STATISTIC(ObjectVisitorArgument,
-          "Number of arguments with unsolved size and offset");
-STATISTIC(ObjectVisitorLoad,
-          "Number of load instructions with unsolved size and offset");
-
-APInt ObjectSizeOffsetVisitor::align(APInt Size, uint64_t Align) {
-  if (Options.RoundToAlign && Align)
-    return APInt(IntTyBits, alignTo(Size.getZExtValue(), Align));
-  return Size;
-}
-
-ObjectSizeOffsetVisitor::ObjectSizeOffsetVisitor(const DataLayout &DL,
-                                                 const TargetLibraryInfo *TLI,
-                                                 LLVMContext &Context,
-                                                 ObjectSizeOpts Options)
-    : DL(DL), TLI(TLI), Options(Options) {
-  // Pointer size must be rechecked for each object visited since it could have
-  // a different address space.
-}
-
-SizeOffsetType ObjectSizeOffsetVisitor::compute(Value *V) {
-  IntTyBits = DL.getPointerTypeSizeInBits(V->getType());
-  Zero = APInt::getNullValue(IntTyBits);
-
-  V = V->stripPointerCasts();
-  if (Instruction *I = dyn_cast<Instruction>(V)) {
-    // If we have already seen this instruction, bail out. Cycles can happen in
-    // unreachable code after constant propagation.
-    if (!SeenInsts.insert(I).second)
-      return unknown();
-
-    if (GEPOperator *GEP = dyn_cast<GEPOperator>(V))
-      return visitGEPOperator(*GEP);
-    return visit(*I);
-  }
-  if (Argument *A = dyn_cast<Argument>(V))
-    return visitArgument(*A);
-  if (ConstantPointerNull *P = dyn_cast<ConstantPointerNull>(V))
-    return visitConstantPointerNull(*P);
-  if (GlobalAlias *GA = dyn_cast<GlobalAlias>(V))
-    return visitGlobalAlias(*GA);
-  if (GlobalVariable *GV = dyn_cast<GlobalVariable>(V))
-    return visitGlobalVariable(*GV);
-  if (UndefValue *UV = dyn_cast<UndefValue>(V))
-    return visitUndefValue(*UV);
-  if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
-    if (CE->getOpcode() == Instruction::IntToPtr)
-      return unknown(); // clueless
-    if (CE->getOpcode() == Instruction::GetElementPtr)
-      return visitGEPOperator(cast<GEPOperator>(*CE));
-  }
-
-  LLVM_DEBUG(dbgs() << "ObjectSizeOffsetVisitor::compute() unhandled value: "
-                    << *V << '\n');
-  return unknown();
-}
-
-/// When we're compiling N-bit code, and the user uses parameters that are
-/// greater than N bits (e.g. uint64_t on a 32-bit build), we can run into
-/// trouble with APInt size issues. This function handles resizing + overflow
-/// checks for us. Check and zext or trunc \p I depending on IntTyBits and
-/// I's value.
-bool ObjectSizeOffsetVisitor::CheckedZextOrTrunc(APInt &I) {
-  // More bits than we can handle. Checking the bit width isn't necessary, but
-  // it's faster than checking active bits, and should give `false` in the
-  // vast majority of cases.
-  if (I.getBitWidth() > IntTyBits && I.getActiveBits() > IntTyBits)
-    return false;
-  if (I.getBitWidth() != IntTyBits)
-    I = I.zextOrTrunc(IntTyBits);
-  return true;
-}
-
-SizeOffsetType ObjectSizeOffsetVisitor::visitAllocaInst(AllocaInst &I) {
-  if (!I.getAllocatedType()->isSized())
-    return unknown();
-
-  APInt Size(IntTyBits, DL.getTypeAllocSize(I.getAllocatedType()));
-  if (!I.isArrayAllocation())
-    return std::make_pair(align(Size, I.getAlignment()), Zero);
-
-  Value *ArraySize = I.getArraySize();
-  if (const ConstantInt *C = dyn_cast<ConstantInt>(ArraySize)) {
-    APInt NumElems = C->getValue();
-    if (!CheckedZextOrTrunc(NumElems))
-      return unknown();
-
-    bool Overflow;
-    Size = Size.umul_ov(NumElems, Overflow);
-    return Overflow ? unknown() : std::make_pair(align(Size, I.getAlignment()),
-                                                 Zero);
-  }
-  return unknown();
-}
-
-SizeOffsetType ObjectSizeOffsetVisitor::visitArgument(Argument &A) {
-  // No interprocedural analysis is done at the moment.
-  if (!A.hasByValOrInAllocaAttr()) {
-    ++ObjectVisitorArgument;
-    return unknown();
-  }
-  PointerType *PT = cast<PointerType>(A.getType());
-  APInt Size(IntTyBits, DL.getTypeAllocSize(PT->getElementType()));
-  return std::make_pair(align(Size, A.getParamAlignment()), Zero);
-}
-
-SizeOffsetType ObjectSizeOffsetVisitor::visitCallSite(CallSite CS) {
-  Optional<AllocFnsTy> FnData = getAllocationSize(CS.getInstruction(), TLI);
-  if (!FnData)
-    return unknown();
-
-  // Handle strdup-like functions separately.
-  if (FnData->AllocTy == StrDupLike) {
-    APInt Size(IntTyBits, GetStringLength(CS.getArgument(0)));
-    if (!Size)
-      return unknown();
-
-    // Strndup limits strlen.
-    if (FnData->FstParam > 0) {
-      ConstantInt *Arg =
-          dyn_cast<ConstantInt>(CS.getArgument(FnData->FstParam));
-      if (!Arg)
-        return unknown();
-
-      APInt MaxSize = Arg->getValue().zextOrSelf(IntTyBits);
-      if (Size.ugt(MaxSize))
-        Size = MaxSize + 1;
-    }
-    return std::make_pair(Size, Zero);
-  }
-
-  ConstantInt *Arg = dyn_cast<ConstantInt>(CS.getArgument(FnData->FstParam));
-  if (!Arg)
-    return unknown();
-
-  APInt Size = Arg->getValue();
-  if (!CheckedZextOrTrunc(Size))
-    return unknown();
-
-  // Size is determined by just 1 parameter.
-  if (FnData->SndParam < 0)
-    return std::make_pair(Size, Zero);
-
-  Arg = dyn_cast<ConstantInt>(CS.getArgument(FnData->SndParam));
-  if (!Arg)
-    return unknown();
-
-  APInt NumElems = Arg->getValue();
-  if (!CheckedZextOrTrunc(NumElems))
-    return unknown();
-
-  bool Overflow;
-  Size = Size.umul_ov(NumElems, Overflow);
-  return Overflow ? unknown() : std::make_pair(Size, Zero);
-
-  // TODO: handle more standard functions (+ wchar cousins):
-  // - strdup / strndup
-  // - strcpy / strncpy
-  // - strcat / strncat
-  // - memcpy / memmove
-  // - strcat / strncat
-  // - memset
-}
-
-SizeOffsetType
-ObjectSizeOffsetVisitor::visitConstantPointerNull(ConstantPointerNull& CPN) {
-  // If null is unknown, there's nothing we can do. Additionally, non-zero
-  // address spaces can make use of null, so we don't presume to know anything
-  // about that.
-  //
-  // TODO: How should this work with address space casts? We currently just drop
-  // them on the floor, but it's unclear what we should do when a NULL from
-  // addrspace(1) gets casted to addrspace(0) (or vice-versa).
-  if (Options.NullIsUnknownSize || CPN.getType()->getAddressSpace())
-    return unknown();
-  return std::make_pair(Zero, Zero);
-}
-
-SizeOffsetType
-ObjectSizeOffsetVisitor::visitExtractElementInst(ExtractElementInst&) {
-  return unknown();
-}
-
-SizeOffsetType
-ObjectSizeOffsetVisitor::visitExtractValueInst(ExtractValueInst&) {
-  // Easy cases were already folded by previous passes.
-  return unknown();
-}
-
-SizeOffsetType ObjectSizeOffsetVisitor::visitGEPOperator(GEPOperator &GEP) {
-  SizeOffsetType PtrData = compute(GEP.getPointerOperand());
-  APInt Offset(IntTyBits, 0);
-  if (!bothKnown(PtrData) || !GEP.accumulateConstantOffset(DL, Offset))
-    return unknown();
-
-  return std::make_pair(PtrData.first, PtrData.second + Offset);
-}
-
-SizeOffsetType ObjectSizeOffsetVisitor::visitGlobalAlias(GlobalAlias &GA) {
-  if (GA.isInterposable())
-    return unknown();
-  return compute(GA.getAliasee());
-}
-
-SizeOffsetType ObjectSizeOffsetVisitor::visitGlobalVariable(GlobalVariable &GV){
-  if (!GV.hasDefinitiveInitializer())
-    return unknown();
-
-  APInt Size(IntTyBits, DL.getTypeAllocSize(GV.getValueType()));
-  return std::make_pair(align(Size, GV.getAlignment()), Zero);
-}
-
-SizeOffsetType ObjectSizeOffsetVisitor::visitIntToPtrInst(IntToPtrInst&) {
-  // clueless
-  return unknown();
-}
-
-SizeOffsetType ObjectSizeOffsetVisitor::visitLoadInst(LoadInst&) {
-  ++ObjectVisitorLoad;
-  return unknown();
-}
-
-SizeOffsetType ObjectSizeOffsetVisitor::visitPHINode(PHINode&) {
-  // too complex to analyze statically.
-  return unknown();
-}
-
-SizeOffsetType ObjectSizeOffsetVisitor::visitSelectInst(SelectInst &I) {
-  SizeOffsetType TrueSide  = compute(I.getTrueValue());
-  SizeOffsetType FalseSide = compute(I.getFalseValue());
-  if (bothKnown(TrueSide) && bothKnown(FalseSide)) {
-    if (TrueSide == FalseSide) {
-        return TrueSide;
-    }
-
-    APInt TrueResult = getSizeWithOverflow(TrueSide);
-    APInt FalseResult = getSizeWithOverflow(FalseSide);
-
-    if (TrueResult == FalseResult) {
-      return TrueSide;
-    }
-    if (Options.EvalMode == ObjectSizeOpts::Mode::Min) {
-      if (TrueResult.slt(FalseResult))
-        return TrueSide;
-      return FalseSide;
-    }
-    if (Options.EvalMode == ObjectSizeOpts::Mode::Max) {
-      if (TrueResult.sgt(FalseResult))
-        return TrueSide;
-      return FalseSide;
-    }
-  }
-  return unknown();
-}
-
-SizeOffsetType ObjectSizeOffsetVisitor::visitUndefValue(UndefValue&) {
-  return std::make_pair(Zero, Zero);
-}
-
-SizeOffsetType ObjectSizeOffsetVisitor::visitInstruction(Instruction &I) {
-  LLVM_DEBUG(dbgs() << "ObjectSizeOffsetVisitor unknown instruction:" << I
-                    << '\n');
-  return unknown();
-}
-
-ObjectSizeOffsetEvaluator::ObjectSizeOffsetEvaluator(
-    const DataLayout &DL, const TargetLibraryInfo *TLI, LLVMContext &Context,
-    ObjectSizeOpts EvalOpts)
-    : DL(DL), TLI(TLI), Context(Context),
-      Builder(Context, TargetFolder(DL),
-              IRBuilderCallbackInserter(
-                  [&](Instruction *I) { InsertedInstructions.insert(I); })),
-      EvalOpts(EvalOpts) {
-  // IntTy and Zero must be set for each compute() since the address space may
-  // be different for later objects.
-}
-
-SizeOffsetEvalType ObjectSizeOffsetEvaluator::compute(Value *V) {
-  // XXX - Are vectors of pointers possible here?
-  IntTy = cast<IntegerType>(DL.getIntPtrType(V->getType()));
-  Zero = ConstantInt::get(IntTy, 0);
-
-  SizeOffsetEvalType Result = compute_(V);
-
-  if (!bothKnown(Result)) {
-    // Erase everything that was computed in this iteration from the cache, so
-    // that no dangling references are left behind. We could be a bit smarter if
-    // we kept a dependency graph. It's probably not worth the complexity.
-    for (const Value *SeenVal : SeenVals) {
-      CacheMapTy::iterator CacheIt = CacheMap.find(SeenVal);
-      // non-computable results can be safely cached
-      if (CacheIt != CacheMap.end() && anyKnown(CacheIt->second))
-        CacheMap.erase(CacheIt);
-    }
-
-    // Erase any instructions we inserted as part of the traversal.
-    for (Instruction *I : InsertedInstructions) {
-      I->replaceAllUsesWith(UndefValue::get(I->getType()));
-      I->eraseFromParent();
-    }
-  }
-
-  SeenVals.clear();
-  InsertedInstructions.clear();
-  return Result;
-}
-
-SizeOffsetEvalType ObjectSizeOffsetEvaluator::compute_(Value *V) {
-  ObjectSizeOffsetVisitor Visitor(DL, TLI, Context, EvalOpts);
-  SizeOffsetType Const = Visitor.compute(V);
-  if (Visitor.bothKnown(Const))
-    return std::make_pair(ConstantInt::get(Context, Const.first),
-                          ConstantInt::get(Context, Const.second));
-
-  V = V->stripPointerCasts();
-
-  // Check cache.
-  CacheMapTy::iterator CacheIt = CacheMap.find(V);
-  if (CacheIt != CacheMap.end())
-    return CacheIt->second;
-
-  // Always generate code immediately before the instruction being
-  // processed, so that the generated code dominates the same BBs.
-  BuilderTy::InsertPointGuard Guard(Builder);
-  if (Instruction *I = dyn_cast<Instruction>(V))
-    Builder.SetInsertPoint(I);
-
-  // Now compute the size and offset.
-  SizeOffsetEvalType Result;
-
-  // Record the pointers that were handled in this run, so that they can be
-  // cleaned later if something fails. We also use this set to break cycles that
-  // can occur in dead code.
-  if (!SeenVals.insert(V).second) {
-    Result = unknown();
-  } else if (GEPOperator *GEP = dyn_cast<GEPOperator>(V)) {
-    Result = visitGEPOperator(*GEP);
-  } else if (Instruction *I = dyn_cast<Instruction>(V)) {
-    Result = visit(*I);
-  } else if (isa<Argument>(V) ||
-             (isa<ConstantExpr>(V) &&
-              cast<ConstantExpr>(V)->getOpcode() == Instruction::IntToPtr) ||
-             isa<GlobalAlias>(V) ||
-             isa<GlobalVariable>(V)) {
-    // Ignore values where we cannot do more than ObjectSizeVisitor.
-    Result = unknown();
-  } else {
-    LLVM_DEBUG(
-        dbgs() << "ObjectSizeOffsetEvaluator::compute() unhandled value: " << *V
-               << '\n');
-    Result = unknown();
-  }
-
-  // Don't reuse CacheIt since it may be invalid at this point.
-  CacheMap[V] = Result;
-  return Result;
-}
-
-SizeOffsetEvalType ObjectSizeOffsetEvaluator::visitAllocaInst(AllocaInst &I) {
-  if (!I.getAllocatedType()->isSized())
-    return unknown();
-
-  // must be a VLA
-  assert(I.isArrayAllocation());
-  Value *ArraySize = I.getArraySize();
-  Value *Size = ConstantInt::get(ArraySize->getType(),
-                                 DL.getTypeAllocSize(I.getAllocatedType()));
-  Size = Builder.CreateMul(Size, ArraySize);
-  return std::make_pair(Size, Zero);
-}
-
-SizeOffsetEvalType ObjectSizeOffsetEvaluator::visitCallSite(CallSite CS) {
-  Optional<AllocFnsTy> FnData = getAllocationSize(CS.getInstruction(), TLI);
-  if (!FnData)
-    return unknown();
-
-  // Handle strdup-like functions separately.
-  if (FnData->AllocTy == StrDupLike) {
-    // TODO
-    return unknown();
-  }
-
-  Value *FirstArg = CS.getArgument(FnData->FstParam);
-  FirstArg = Builder.CreateZExt(FirstArg, IntTy);
-  if (FnData->SndParam < 0)
-    return std::make_pair(FirstArg, Zero);
-
-  Value *SecondArg = CS.getArgument(FnData->SndParam);
-  SecondArg = Builder.CreateZExt(SecondArg, IntTy);
-  Value *Size = Builder.CreateMul(FirstArg, SecondArg);
-  return std::make_pair(Size, Zero);
-
-  // TODO: handle more standard functions (+ wchar cousins):
-  // - strdup / strndup
-  // - strcpy / strncpy
-  // - strcat / strncat
-  // - memcpy / memmove
-  // - strcat / strncat
-  // - memset
-}
-
-SizeOffsetEvalType
-ObjectSizeOffsetEvaluator::visitExtractElementInst(ExtractElementInst&) {
-  return unknown();
-}
-
-SizeOffsetEvalType
-ObjectSizeOffsetEvaluator::visitExtractValueInst(ExtractValueInst&) {
-  return unknown();
-}
-
-SizeOffsetEvalType
-ObjectSizeOffsetEvaluator::visitGEPOperator(GEPOperator &GEP) {
-  SizeOffsetEvalType PtrData = compute_(GEP.getPointerOperand());
-  if (!bothKnown(PtrData))
-    return unknown();
-
-  Value *Offset = EmitGEPOffset(&Builder, DL, &GEP, /*NoAssumptions=*/true);
-  Offset = Builder.CreateAdd(PtrData.second, Offset);
-  return std::make_pair(PtrData.first, Offset);
-}
-
-SizeOffsetEvalType ObjectSizeOffsetEvaluator::visitIntToPtrInst(IntToPtrInst&) {
-  // clueless
-  return unknown();
-}
-
-SizeOffsetEvalType ObjectSizeOffsetEvaluator::visitLoadInst(LoadInst&) {
-  return unknown();
-}
-
-SizeOffsetEvalType ObjectSizeOffsetEvaluator::visitPHINode(PHINode &PHI) {
-  // Create 2 PHIs: one for size and another for offset.
-  PHINode *SizePHI   = Builder.CreatePHI(IntTy, PHI.getNumIncomingValues());
-  PHINode *OffsetPHI = Builder.CreatePHI(IntTy, PHI.getNumIncomingValues());
-
-  // Insert right away in the cache to handle recursive PHIs.
-  CacheMap[&PHI] = std::make_pair(SizePHI, OffsetPHI);
-
-  // Compute offset/size for each PHI incoming pointer.
-  for (unsigned i = 0, e = PHI.getNumIncomingValues(); i != e; ++i) {
-    Builder.SetInsertPoint(&*PHI.getIncomingBlock(i)->getFirstInsertionPt());
-    SizeOffsetEvalType EdgeData = compute_(PHI.getIncomingValue(i));
-
-    if (!bothKnown(EdgeData)) {
-      OffsetPHI->replaceAllUsesWith(UndefValue::get(IntTy));
-      OffsetPHI->eraseFromParent();
-      InsertedInstructions.erase(OffsetPHI);
-      SizePHI->replaceAllUsesWith(UndefValue::get(IntTy));
-      SizePHI->eraseFromParent();
-      InsertedInstructions.erase(SizePHI);
-      return unknown();
-    }
-    SizePHI->addIncoming(EdgeData.first, PHI.getIncomingBlock(i));
-    OffsetPHI->addIncoming(EdgeData.second, PHI.getIncomingBlock(i));
-  }
-
-  Value *Size = SizePHI, *Offset = OffsetPHI;
-  if (Value *Tmp = SizePHI->hasConstantValue()) {
-    Size = Tmp;
-    SizePHI->replaceAllUsesWith(Size);
-    SizePHI->eraseFromParent();
-    InsertedInstructions.erase(SizePHI);
-  }
-  if (Value *Tmp = OffsetPHI->hasConstantValue()) {
-    Offset = Tmp;
-    OffsetPHI->replaceAllUsesWith(Offset);
-    OffsetPHI->eraseFromParent();
-    InsertedInstructions.erase(OffsetPHI);
-  }
-  return std::make_pair(Size, Offset);
-}
-
-SizeOffsetEvalType ObjectSizeOffsetEvaluator::visitSelectInst(SelectInst &I) {
-  SizeOffsetEvalType TrueSide  = compute_(I.getTrueValue());
-  SizeOffsetEvalType FalseSide = compute_(I.getFalseValue());
-
-  if (!bothKnown(TrueSide) || !bothKnown(FalseSide))
-    return unknown();
-  if (TrueSide == FalseSide)
-    return TrueSide;
-
-  Value *Size = Builder.CreateSelect(I.getCondition(), TrueSide.first,
-                                     FalseSide.first);
-  Value *Offset = Builder.CreateSelect(I.getCondition(), TrueSide.second,
-                                       FalseSide.second);
-  return std::make_pair(Size, Offset);
-}
-
-SizeOffsetEvalType ObjectSizeOffsetEvaluator::visitInstruction(Instruction &I) {
-  LLVM_DEBUG(dbgs() << "ObjectSizeOffsetEvaluator unknown instruction:" << I
-                    << '\n');
-  return unknown();
-}