Update prebuilt Clang to r353983e.HEADq10.0

clang 9.0.5 (based on r353983e) from build 5696680.

Bug: http://b/135931688
Bug: http://b/136008926
Test: N/A
Change-Id: I922d17410047d2e2df4625615352c588ee71b203

1 files changed, 829 insertions, 0 deletions

diff --git a/clang-r353983e/include/llvm/IR/Function.h b/clang-r353983e/include/llvm/IR/Function.h
new file mode 100644
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--- /dev/null
+++ b/clang-r353983e/include/llvm/IR/Function.h
@@ -0,0 +1,829 @@
+//===- llvm/Function.h - Class to represent a single function ---*- C++ -*-===//
+//
+// 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 file contains the declaration of the Function class, which represents a
+// single function/procedure in LLVM.
+//
+// A function basically consists of a list of basic blocks, a list of arguments,
+// and a symbol table.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_IR_FUNCTION_H
+#define LLVM_IR_FUNCTION_H
+
+#include "llvm/ADT/DenseSet.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/ADT/ilist_node.h"
+#include "llvm/ADT/iterator_range.h"
+#include "llvm/IR/Argument.h"
+#include "llvm/IR/Attributes.h"
+#include "llvm/IR/BasicBlock.h"
+#include "llvm/IR/CallingConv.h"
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/GlobalObject.h"
+#include "llvm/IR/GlobalValue.h"
+#include "llvm/IR/OperandTraits.h"
+#include "llvm/IR/SymbolTableListTraits.h"
+#include "llvm/IR/Value.h"
+#include "llvm/Support/Casting.h"
+#include "llvm/Support/Compiler.h"
+#include <cassert>
+#include <cstddef>
+#include <cstdint>
+#include <memory>
+#include <string>
+
+namespace llvm {
+
+namespace Intrinsic {
+enum ID : unsigned;
+}
+
+class AssemblyAnnotationWriter;
+class Constant;
+class DISubprogram;
+class LLVMContext;
+class Module;
+template <typename T> class Optional;
+class raw_ostream;
+class Type;
+class User;
+
+class Function : public GlobalObject, public ilist_node<Function> {
+public:
+  using BasicBlockListType = SymbolTableList<BasicBlock>;
+
+  // BasicBlock iterators...
+  using iterator = BasicBlockListType::iterator;
+  using const_iterator = BasicBlockListType::const_iterator;
+
+  using arg_iterator = Argument *;
+  using const_arg_iterator = const Argument *;
+
+private:
+  // Important things that make up a function!
+  BasicBlockListType BasicBlocks;         ///< The basic blocks
+  mutable Argument *Arguments = nullptr;  ///< The formal arguments
+  size_t NumArgs;
+  std::unique_ptr<ValueSymbolTable>
+      SymTab;                             ///< Symbol table of args/instructions
+  AttributeList AttributeSets;            ///< Parameter attributes
+
+  /*
+   * Value::SubclassData
+   *
+   * bit 0      : HasLazyArguments
+   * bit 1      : HasPrefixData
+   * bit 2      : HasPrologueData
+   * bit 3      : HasPersonalityFn
+   * bits 4-13  : CallingConvention
+   * bits 14    : HasGC
+   * bits 15 : [reserved]
+   */
+
+  /// Bits from GlobalObject::GlobalObjectSubclassData.
+  enum {
+    /// Whether this function is materializable.
+    IsMaterializableBit = 0,
+  };
+
+  friend class SymbolTableListTraits<Function>;
+
+  /// hasLazyArguments/CheckLazyArguments - The argument list of a function is
+  /// built on demand, so that the list isn't allocated until the first client
+  /// needs it.  The hasLazyArguments predicate returns true if the arg list
+  /// hasn't been set up yet.
+public:
+  bool hasLazyArguments() const {
+    return getSubclassDataFromValue() & (1<<0);
+  }
+
+private:
+  void CheckLazyArguments() const {
+    if (hasLazyArguments())
+      BuildLazyArguments();
+  }
+
+  void BuildLazyArguments() const;
+
+  void clearArguments();
+
+  /// Function ctor - If the (optional) Module argument is specified, the
+  /// function is automatically inserted into the end of the function list for
+  /// the module.
+  ///
+  Function(FunctionType *Ty, LinkageTypes Linkage, unsigned AddrSpace,
+           const Twine &N = "", Module *M = nullptr);
+
+public:
+  Function(const Function&) = delete;
+  void operator=(const Function&) = delete;
+  ~Function();
+
+  // This is here to help easily convert from FunctionT * (Function * or
+  // MachineFunction *) in BlockFrequencyInfoImpl to Function * by calling
+  // FunctionT->getFunction().
+  const Function &getFunction() const { return *this; }
+
+  static Function *Create(FunctionType *Ty, LinkageTypes Linkage,
+                          unsigned AddrSpace, const Twine &N = "",
+                          Module *M = nullptr) {
+    return new Function(Ty, Linkage, AddrSpace, N, M);
+  }
+
+  // TODO: remove this once all users have been updated to pass an AddrSpace
+  static Function *Create(FunctionType *Ty, LinkageTypes Linkage,
+                          const Twine &N = "", Module *M = nullptr) {
+    return new Function(Ty, Linkage, static_cast<unsigned>(-1), N, M);
+  }
+
+  /// Creates a new function and attaches it to a module.
+  ///
+  /// Places the function in the program address space as specified
+  /// by the module's data layout.
+  static Function *Create(FunctionType *Ty, LinkageTypes Linkage,
+                          const Twine &N, Module &M);
+
+  // Provide fast operand accessors.
+  DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
+
+  /// Returns the number of non-debug IR instructions in this function.
+  /// This is equivalent to the sum of the sizes of each basic block contained
+  /// within this function.
+  unsigned getInstructionCount() const;
+
+  /// Returns the FunctionType for me.
+  FunctionType *getFunctionType() const {
+    return cast<FunctionType>(getValueType());
+  }
+
+  /// Returns the type of the ret val.
+  Type *getReturnType() const { return getFunctionType()->getReturnType(); }
+
+  /// getContext - Return a reference to the LLVMContext associated with this
+  /// function.
+  LLVMContext &getContext() const;
+
+  /// isVarArg - Return true if this function takes a variable number of
+  /// arguments.
+  bool isVarArg() const { return getFunctionType()->isVarArg(); }
+
+  bool isMaterializable() const {
+    return getGlobalObjectSubClassData() & (1 << IsMaterializableBit);
+  }
+  void setIsMaterializable(bool V) {
+    unsigned Mask = 1 << IsMaterializableBit;
+    setGlobalObjectSubClassData((~Mask & getGlobalObjectSubClassData()) |
+                                (V ? Mask : 0u));
+  }
+
+  /// getIntrinsicID - This method returns the ID number of the specified
+  /// function, or Intrinsic::not_intrinsic if the function is not an
+  /// intrinsic, or if the pointer is null.  This value is always defined to be
+  /// zero to allow easy checking for whether a function is intrinsic or not.
+  /// The particular intrinsic functions which correspond to this value are
+  /// defined in llvm/Intrinsics.h.
+  Intrinsic::ID getIntrinsicID() const LLVM_READONLY { return IntID; }
+
+  /// isIntrinsic - Returns true if the function's name starts with "llvm.".
+  /// It's possible for this function to return true while getIntrinsicID()
+  /// returns Intrinsic::not_intrinsic!
+  bool isIntrinsic() const { return HasLLVMReservedName; }
+
+  static Intrinsic::ID lookupIntrinsicID(StringRef Name);
+
+  /// Recalculate the ID for this function if it is an Intrinsic defined
+  /// in llvm/Intrinsics.h.  Sets the intrinsic ID to Intrinsic::not_intrinsic
+  /// if the name of this function does not match an intrinsic in that header.
+  /// Note, this method does not need to be called directly, as it is called
+  /// from Value::setName() whenever the name of this function changes.
+  void recalculateIntrinsicID();
+
+  /// getCallingConv()/setCallingConv(CC) - These method get and set the
+  /// calling convention of this function.  The enum values for the known
+  /// calling conventions are defined in CallingConv.h.
+  CallingConv::ID getCallingConv() const {
+    return static_cast<CallingConv::ID>((getSubclassDataFromValue() >> 4) &
+                                        CallingConv::MaxID);
+  }
+  void setCallingConv(CallingConv::ID CC) {
+    auto ID = static_cast<unsigned>(CC);
+    assert(!(ID & ~CallingConv::MaxID) && "Unsupported calling convention");
+    setValueSubclassData((getSubclassDataFromValue() & 0xc00f) | (ID << 4));
+  }
+
+  /// Return the attribute list for this Function.
+  AttributeList getAttributes() const { return AttributeSets; }
+
+  /// Set the attribute list for this Function.
+  void setAttributes(AttributeList Attrs) { AttributeSets = Attrs; }
+
+  /// Add function attributes to this function.
+  void addFnAttr(Attribute::AttrKind Kind) {
+    addAttribute(AttributeList::FunctionIndex, Kind);
+  }
+
+  /// Add function attributes to this function.
+  void addFnAttr(StringRef Kind, StringRef Val = StringRef()) {
+    addAttribute(AttributeList::FunctionIndex,
+                 Attribute::get(getContext(), Kind, Val));
+  }
+
+  /// Add function attributes to this function.
+  void addFnAttr(Attribute Attr) {
+    addAttribute(AttributeList::FunctionIndex, Attr);
+  }
+
+  /// Remove function attributes from this function.
+  void removeFnAttr(Attribute::AttrKind Kind) {
+    removeAttribute(AttributeList::FunctionIndex, Kind);
+  }
+
+  /// Remove function attribute from this function.
+  void removeFnAttr(StringRef Kind) {
+    setAttributes(getAttributes().removeAttribute(
+        getContext(), AttributeList::FunctionIndex, Kind));
+  }
+
+  enum ProfileCountType { PCT_Invalid, PCT_Real, PCT_Synthetic };
+
+  /// Class to represent profile counts.
+  ///
+  /// This class represents both real and synthetic profile counts.
+  class ProfileCount {
+  private:
+    uint64_t Count;
+    ProfileCountType PCT;
+    static ProfileCount Invalid;
+
+  public:
+    ProfileCount() : Count(-1), PCT(PCT_Invalid) {}
+    ProfileCount(uint64_t Count, ProfileCountType PCT)
+        : Count(Count), PCT(PCT) {}
+    bool hasValue() const { return PCT != PCT_Invalid; }
+    uint64_t getCount() const { return Count; }
+    ProfileCountType getType() const { return PCT; }
+    bool isSynthetic() const { return PCT == PCT_Synthetic; }
+    explicit operator bool() { return hasValue(); }
+    bool operator!() const { return !hasValue(); }
+    // Update the count retaining the same profile count type.
+    ProfileCount &setCount(uint64_t C) {
+      Count = C;
+      return *this;
+    }
+    static ProfileCount getInvalid() { return ProfileCount(-1, PCT_Invalid); }
+  };
+
+  /// Set the entry count for this function.
+  ///
+  /// Entry count is the number of times this function was executed based on
+  /// pgo data. \p Imports points to a set of GUIDs that needs to
+  /// be imported by the function for sample PGO, to enable the same inlines as
+  /// the profiled optimized binary.
+  void setEntryCount(ProfileCount Count,
+                     const DenseSet<GlobalValue::GUID> *Imports = nullptr);
+
+  /// A convenience wrapper for setting entry count
+  void setEntryCount(uint64_t Count, ProfileCountType Type = PCT_Real,
+                     const DenseSet<GlobalValue::GUID> *Imports = nullptr);
+
+  /// Get the entry count for this function.
+  ///
+  /// Entry count is the number of times the function was executed based on
+  /// pgo data.
+  ProfileCount getEntryCount() const;
+
+  /// Return true if the function is annotated with profile data.
+  ///
+  /// Presence of entry counts from a profile run implies the function has
+  /// profile annotations.
+  bool hasProfileData() const { return getEntryCount().hasValue(); }
+
+  /// Returns the set of GUIDs that needs to be imported to the function for
+  /// sample PGO, to enable the same inlines as the profiled optimized binary.
+  DenseSet<GlobalValue::GUID> getImportGUIDs() const;
+
+  /// Set the section prefix for this function.
+  void setSectionPrefix(StringRef Prefix);
+
+  /// Get the section prefix for this function.
+  Optional<StringRef> getSectionPrefix() const;
+
+  /// Return true if the function has the attribute.
+  bool hasFnAttribute(Attribute::AttrKind Kind) const {
+    return AttributeSets.hasFnAttribute(Kind);
+  }
+
+  /// Return true if the function has the attribute.
+  bool hasFnAttribute(StringRef Kind) const {
+    return AttributeSets.hasFnAttribute(Kind);
+  }
+
+  /// Return the attribute for the given attribute kind.
+  Attribute getFnAttribute(Attribute::AttrKind Kind) const {
+    return getAttribute(AttributeList::FunctionIndex, Kind);
+  }
+
+  /// Return the attribute for the given attribute kind.
+  Attribute getFnAttribute(StringRef Kind) const {
+    return getAttribute(AttributeList::FunctionIndex, Kind);
+  }
+
+  /// Return the stack alignment for the function.
+  unsigned getFnStackAlignment() const {
+    if (!hasFnAttribute(Attribute::StackAlignment))
+      return 0;
+    return AttributeSets.getStackAlignment(AttributeList::FunctionIndex);
+  }
+
+  /// hasGC/getGC/setGC/clearGC - The name of the garbage collection algorithm
+  ///                             to use during code generation.
+  bool hasGC() const {
+    return getSubclassDataFromValue() & (1<<14);
+  }
+  const std::string &getGC() const;
+  void setGC(std::string Str);
+  void clearGC();
+
+  /// adds the attribute to the list of attributes.
+  void addAttribute(unsigned i, Attribute::AttrKind Kind);
+
+  /// adds the attribute to the list of attributes.
+  void addAttribute(unsigned i, Attribute Attr);
+
+  /// adds the attributes to the list of attributes.
+  void addAttributes(unsigned i, const AttrBuilder &Attrs);
+
+  /// adds the attribute to the list of attributes for the given arg.
+  void addParamAttr(unsigned ArgNo, Attribute::AttrKind Kind);
+
+  /// adds the attribute to the list of attributes for the given arg.
+  void addParamAttr(unsigned ArgNo, Attribute Attr);
+
+  /// adds the attributes to the list of attributes for the given arg.
+  void addParamAttrs(unsigned ArgNo, const AttrBuilder &Attrs);
+
+  /// removes the attribute from the list of attributes.
+  void removeAttribute(unsigned i, Attribute::AttrKind Kind);
+
+  /// removes the attribute from the list of attributes.
+  void removeAttribute(unsigned i, StringRef Kind);
+
+  /// removes the attributes from the list of attributes.
+  void removeAttributes(unsigned i, const AttrBuilder &Attrs);
+
+  /// removes the attribute from the list of attributes.
+  void removeParamAttr(unsigned ArgNo, Attribute::AttrKind Kind);
+
+  /// removes the attribute from the list of attributes.
+  void removeParamAttr(unsigned ArgNo, StringRef Kind);
+
+  /// removes the attribute from the list of attributes.
+  void removeParamAttrs(unsigned ArgNo, const AttrBuilder &Attrs);
+
+  /// check if an attributes is in the list of attributes.
+  bool hasAttribute(unsigned i, Attribute::AttrKind Kind) const {
+    return getAttributes().hasAttribute(i, Kind);
+  }
+
+  /// check if an attributes is in the list of attributes.
+  bool hasParamAttribute(unsigned ArgNo, Attribute::AttrKind Kind) const {
+    return getAttributes().hasParamAttribute(ArgNo, Kind);
+  }
+
+  /// gets the attribute from the list of attributes.
+  Attribute getAttribute(unsigned i, Attribute::AttrKind Kind) const {
+    return AttributeSets.getAttribute(i, Kind);
+  }
+
+  /// gets the attribute from the list of attributes.
+  Attribute getAttribute(unsigned i, StringRef Kind) const {
+    return AttributeSets.getAttribute(i, Kind);
+  }
+
+  /// adds the dereferenceable attribute to the list of attributes.
+  void addDereferenceableAttr(unsigned i, uint64_t Bytes);
+
+  /// adds the dereferenceable attribute to the list of attributes for
+  /// the given arg.
+  void addDereferenceableParamAttr(unsigned ArgNo, uint64_t Bytes);
+
+  /// adds the dereferenceable_or_null attribute to the list of
+  /// attributes.
+  void addDereferenceableOrNullAttr(unsigned i, uint64_t Bytes);
+
+  /// adds the dereferenceable_or_null attribute to the list of
+  /// attributes for the given arg.
+  void addDereferenceableOrNullParamAttr(unsigned ArgNo, uint64_t Bytes);
+
+  /// Extract the alignment for a call or parameter (0=unknown).
+  unsigned getParamAlignment(unsigned ArgNo) const {
+    return AttributeSets.getParamAlignment(ArgNo);
+  }
+
+  /// Extract the number of dereferenceable bytes for a call or
+  /// parameter (0=unknown).
+  /// @param i AttributeList index, referring to a return value or argument.
+  uint64_t getDereferenceableBytes(unsigned i) const {
+    return AttributeSets.getDereferenceableBytes(i);
+  }
+
+  /// Extract the number of dereferenceable bytes for a parameter.
+  /// @param ArgNo Index of an argument, with 0 being the first function arg.
+  uint64_t getParamDereferenceableBytes(unsigned ArgNo) const {
+    return AttributeSets.getParamDereferenceableBytes(ArgNo);
+  }
+
+  /// Extract the number of dereferenceable_or_null bytes for a call or
+  /// parameter (0=unknown).
+  /// @param i AttributeList index, referring to a return value or argument.
+  uint64_t getDereferenceableOrNullBytes(unsigned i) const {
+    return AttributeSets.getDereferenceableOrNullBytes(i);
+  }
+
+  /// Extract the number of dereferenceable_or_null bytes for a
+  /// parameter.
+  /// @param ArgNo AttributeList ArgNo, referring to an argument.
+  uint64_t getParamDereferenceableOrNullBytes(unsigned ArgNo) const {
+    return AttributeSets.getParamDereferenceableOrNullBytes(ArgNo);
+  }
+
+  /// Determine if the function does not access memory.
+  bool doesNotAccessMemory() const {
+    return hasFnAttribute(Attribute::ReadNone);
+  }
+  void setDoesNotAccessMemory() {
+    addFnAttr(Attribute::ReadNone);
+  }
+
+  /// Determine if the function does not access or only reads memory.
+  bool onlyReadsMemory() const {
+    return doesNotAccessMemory() || hasFnAttribute(Attribute::ReadOnly);
+  }
+  void setOnlyReadsMemory() {
+    addFnAttr(Attribute::ReadOnly);
+  }
+
+  /// Determine if the function does not access or only writes memory.
+  bool doesNotReadMemory() const {
+    return doesNotAccessMemory() || hasFnAttribute(Attribute::WriteOnly);
+  }
+  void setDoesNotReadMemory() {
+    addFnAttr(Attribute::WriteOnly);
+  }
+
+  /// Determine if the call can access memmory only using pointers based
+  /// on its arguments.
+  bool onlyAccessesArgMemory() const {
+    return hasFnAttribute(Attribute::ArgMemOnly);
+  }
+  void setOnlyAccessesArgMemory() { addFnAttr(Attribute::ArgMemOnly); }
+
+  /// Determine if the function may only access memory that is
+  ///  inaccessible from the IR.
+  bool onlyAccessesInaccessibleMemory() const {
+    return hasFnAttribute(Attribute::InaccessibleMemOnly);
+  }
+  void setOnlyAccessesInaccessibleMemory() {
+    addFnAttr(Attribute::InaccessibleMemOnly);
+  }
+
+  /// Determine if the function may only access memory that is
+  ///  either inaccessible from the IR or pointed to by its arguments.
+  bool onlyAccessesInaccessibleMemOrArgMem() const {
+    return hasFnAttribute(Attribute::InaccessibleMemOrArgMemOnly);
+  }
+  void setOnlyAccessesInaccessibleMemOrArgMem() {
+    addFnAttr(Attribute::InaccessibleMemOrArgMemOnly);
+  }
+
+  /// Determine if the function cannot return.
+  bool doesNotReturn() const {
+    return hasFnAttribute(Attribute::NoReturn);
+  }
+  void setDoesNotReturn() {
+    addFnAttr(Attribute::NoReturn);
+  }
+
+  /// Determine if the function should not perform indirect branch tracking.
+  bool doesNoCfCheck() const { return hasFnAttribute(Attribute::NoCfCheck); }
+
+  /// Determine if the function cannot unwind.
+  bool doesNotThrow() const {
+    return hasFnAttribute(Attribute::NoUnwind);
+  }
+  void setDoesNotThrow() {
+    addFnAttr(Attribute::NoUnwind);
+  }
+
+  /// Determine if the call cannot be duplicated.
+  bool cannotDuplicate() const {
+    return hasFnAttribute(Attribute::NoDuplicate);
+  }
+  void setCannotDuplicate() {
+    addFnAttr(Attribute::NoDuplicate);
+  }
+
+  /// Determine if the call is convergent.
+  bool isConvergent() const {
+    return hasFnAttribute(Attribute::Convergent);
+  }
+  void setConvergent() {
+    addFnAttr(Attribute::Convergent);
+  }
+  void setNotConvergent() {
+    removeFnAttr(Attribute::Convergent);
+  }
+
+  /// Determine if the call has sideeffects.
+  bool isSpeculatable() const {
+    return hasFnAttribute(Attribute::Speculatable);
+  }
+  void setSpeculatable() {
+    addFnAttr(Attribute::Speculatable);
+  }
+
+  /// Determine if the function is known not to recurse, directly or
+  /// indirectly.
+  bool doesNotRecurse() const {
+    return hasFnAttribute(Attribute::NoRecurse);
+  }
+  void setDoesNotRecurse() {
+    addFnAttr(Attribute::NoRecurse);
+  }
+
+  /// True if the ABI mandates (or the user requested) that this
+  /// function be in a unwind table.
+  bool hasUWTable() const {
+    return hasFnAttribute(Attribute::UWTable);
+  }
+  void setHasUWTable() {
+    addFnAttr(Attribute::UWTable);
+  }
+
+  /// True if this function needs an unwind table.
+  bool needsUnwindTableEntry() const {
+    return hasUWTable() || !doesNotThrow() || hasPersonalityFn();
+  }
+
+  /// Determine if the function returns a structure through first
+  /// or second pointer argument.
+  bool hasStructRetAttr() const {
+    return AttributeSets.hasParamAttribute(0, Attribute::StructRet) ||
+           AttributeSets.hasParamAttribute(1, Attribute::StructRet);
+  }
+
+  /// Determine if the parameter or return value is marked with NoAlias
+  /// attribute.
+  bool returnDoesNotAlias() const {
+    return AttributeSets.hasAttribute(AttributeList::ReturnIndex,
+                                      Attribute::NoAlias);
+  }
+  void setReturnDoesNotAlias() {
+    addAttribute(AttributeList::ReturnIndex, Attribute::NoAlias);
+  }
+
+  /// Optimize this function for minimum size (-Oz).
+  bool optForMinSize() const { return hasFnAttribute(Attribute::MinSize); }
+
+  /// Optimize this function for size (-Os) or minimum size (-Oz).
+  bool optForSize() const {
+    return hasFnAttribute(Attribute::OptimizeForSize) || optForMinSize();
+  }
+
+  /// copyAttributesFrom - copy all additional attributes (those not needed to
+  /// create a Function) from the Function Src to this one.
+  void copyAttributesFrom(const Function *Src);
+
+  /// deleteBody - This method deletes the body of the function, and converts
+  /// the linkage to external.
+  ///
+  void deleteBody() {
+    dropAllReferences();
+    setLinkage(ExternalLinkage);
+  }
+
+  /// removeFromParent - This method unlinks 'this' from the containing module,
+  /// but does not delete it.
+  ///
+  void removeFromParent();
+
+  /// eraseFromParent - This method unlinks 'this' from the containing module
+  /// and deletes it.
+  ///
+  void eraseFromParent();
+
+  /// Steal arguments from another function.
+  ///
+  /// Drop this function's arguments and splice in the ones from \c Src.
+  /// Requires that this has no function body.
+  void stealArgumentListFrom(Function &Src);
+
+  /// Get the underlying elements of the Function... the basic block list is
+  /// empty for external functions.
+  ///
+  const BasicBlockListType &getBasicBlockList() const { return BasicBlocks; }
+        BasicBlockListType &getBasicBlockList()       { return BasicBlocks; }
+
+  static BasicBlockListType Function::*getSublistAccess(BasicBlock*) {
+    return &Function::BasicBlocks;
+  }
+
+  const BasicBlock       &getEntryBlock() const   { return front(); }
+        BasicBlock       &getEntryBlock()         { return front(); }
+
+  //===--------------------------------------------------------------------===//
+  // Symbol Table Accessing functions...
+
+  /// getSymbolTable() - Return the symbol table if any, otherwise nullptr.
+  ///
+  inline ValueSymbolTable *getValueSymbolTable() { return SymTab.get(); }
+  inline const ValueSymbolTable *getValueSymbolTable() const {
+    return SymTab.get();
+  }
+
+  //===--------------------------------------------------------------------===//
+  // BasicBlock iterator forwarding functions
+  //
+  iterator                begin()       { return BasicBlocks.begin(); }
+  const_iterator          begin() const { return BasicBlocks.begin(); }
+  iterator                end  ()       { return BasicBlocks.end();   }
+  const_iterator          end  () const { return BasicBlocks.end();   }
+
+  size_t                   size() const { return BasicBlocks.size();  }
+  bool                    empty() const { return BasicBlocks.empty(); }
+  const BasicBlock       &front() const { return BasicBlocks.front(); }
+        BasicBlock       &front()       { return BasicBlocks.front(); }
+  const BasicBlock        &back() const { return BasicBlocks.back();  }
+        BasicBlock        &back()       { return BasicBlocks.back();  }
+
+/// @name Function Argument Iteration
+/// @{
+
+  arg_iterator arg_begin() {
+    CheckLazyArguments();
+    return Arguments;
+  }
+  const_arg_iterator arg_begin() const {
+    CheckLazyArguments();
+    return Arguments;
+  }
+
+  arg_iterator arg_end() {
+    CheckLazyArguments();
+    return Arguments + NumArgs;
+  }
+  const_arg_iterator arg_end() const {
+    CheckLazyArguments();
+    return Arguments + NumArgs;
+  }
+
+  iterator_range<arg_iterator> args() {
+    return make_range(arg_begin(), arg_end());
+  }
+  iterator_range<const_arg_iterator> args() const {
+    return make_range(arg_begin(), arg_end());
+  }
+
+/// @}
+
+  size_t arg_size() const { return NumArgs; }
+  bool arg_empty() const { return arg_size() == 0; }
+
+  /// Check whether this function has a personality function.
+  bool hasPersonalityFn() const {
+    return getSubclassDataFromValue() & (1<<3);
+  }
+
+  /// Get the personality function associated with this function.
+  Constant *getPersonalityFn() const;
+  void setPersonalityFn(Constant *Fn);
+
+  /// Check whether this function has prefix data.
+  bool hasPrefixData() const {
+    return getSubclassDataFromValue() & (1<<1);
+  }
+
+  /// Get the prefix data associated with this function.
+  Constant *getPrefixData() const;
+  void setPrefixData(Constant *PrefixData);
+
+  /// Check whether this function has prologue data.
+  bool hasPrologueData() const {
+    return getSubclassDataFromValue() & (1<<2);
+  }
+
+  /// Get the prologue data associated with this function.
+  Constant *getPrologueData() const;
+  void setPrologueData(Constant *PrologueData);
+
+  /// Print the function to an output stream with an optional
+  /// AssemblyAnnotationWriter.
+  void print(raw_ostream &OS, AssemblyAnnotationWriter *AAW = nullptr,
+             bool ShouldPreserveUseListOrder = false,
+             bool IsForDebug = false) const;
+
+  /// viewCFG - This function is meant for use from the debugger.  You can just
+  /// say 'call F->viewCFG()' and a ghostview window should pop up from the
+  /// program, displaying the CFG of the current function with the code for each
+  /// basic block inside.  This depends on there being a 'dot' and 'gv' program
+  /// in your path.
+  ///
+  void viewCFG() const;
+
+  /// viewCFGOnly - This function is meant for use from the debugger.  It works
+  /// just like viewCFG, but it does not include the contents of basic blocks
+  /// into the nodes, just the label.  If you are only interested in the CFG
+  /// this can make the graph smaller.
+  ///
+  void viewCFGOnly() const;
+
+  /// Methods for support type inquiry through isa, cast, and dyn_cast:
+  static bool classof(const Value *V) {
+    return V->getValueID() == Value::FunctionVal;
+  }
+
+  /// dropAllReferences() - This method causes all the subinstructions to "let
+  /// go" of all references that they are maintaining.  This allows one to
+  /// 'delete' a whole module at a time, even though there may be circular
+  /// references... first all references are dropped, and all use counts go to
+  /// zero.  Then everything is deleted for real.  Note that no operations are
+  /// valid on an object that has "dropped all references", except operator
+  /// delete.
+  ///
+  /// Since no other object in the module can have references into the body of a
+  /// function, dropping all references deletes the entire body of the function,
+  /// including any contained basic blocks.
+  ///
+  void dropAllReferences();
+
+  /// hasAddressTaken - returns true if there are any uses of this function
+  /// other than direct calls or invokes to it, or blockaddress expressions.
+  /// Optionally passes back an offending user for diagnostic purposes.
+  ///
+  bool hasAddressTaken(const User** = nullptr) const;
+
+  /// isDefTriviallyDead - Return true if it is trivially safe to remove
+  /// this function definition from the module (because it isn't externally
+  /// visible, does not have its address taken, and has no callers).  To make
+  /// this more accurate, call removeDeadConstantUsers first.
+  bool isDefTriviallyDead() const;
+
+  /// callsFunctionThatReturnsTwice - Return true if the function has a call to
+  /// setjmp or other function that gcc recognizes as "returning twice".
+  bool callsFunctionThatReturnsTwice() const;
+
+  /// Set the attached subprogram.
+  ///
+  /// Calls \a setMetadata() with \a LLVMContext::MD_dbg.
+  void setSubprogram(DISubprogram *SP);
+
+  /// Get the attached subprogram.
+  ///
+  /// Calls \a getMetadata() with \a LLVMContext::MD_dbg and casts the result
+  /// to \a DISubprogram.
+  DISubprogram *getSubprogram() const;
+
+  /// Returns true if we should emit debug info for profiling.
+  bool isDebugInfoForProfiling() const;
+
+  /// Check if null pointer dereferencing is considered undefined behavior for
+  /// the function.
+  /// Return value: false => null pointer dereference is undefined.
+  /// Return value: true =>  null pointer dereference is not undefined.
+  bool nullPointerIsDefined() const;
+
+private:
+  void allocHungoffUselist();
+  template<int Idx> void setHungoffOperand(Constant *C);
+
+  /// Shadow Value::setValueSubclassData with a private forwarding method so
+  /// that subclasses cannot accidentally use it.
+  void setValueSubclassData(unsigned short D) {
+    Value::setValueSubclassData(D);
+  }
+  void setValueSubclassDataBit(unsigned Bit, bool On);
+};
+
+/// Check whether null pointer dereferencing is considered undefined behavior
+/// for a given function or an address space.
+/// Null pointer access in non-zero address space is not considered undefined.
+/// Return value: false => null pointer dereference is undefined.
+/// Return value: true =>  null pointer dereference is not undefined.
+bool NullPointerIsDefined(const Function *F, unsigned AS = 0);
+
+template <>
+struct OperandTraits<Function> : public HungoffOperandTraits<3> {};
+
+DEFINE_TRANSPARENT_OPERAND_ACCESSORS(Function, Value)
+
+} // end namespace llvm
+
+#endif // LLVM_IR_FUNCTION_H