Merge "Update prebuilt Clang to r353983." into p9.0HEADp9.0-backupp9.0

1 files changed, 264 insertions, 0 deletions

diff --git a/clang-r353983/include/llvm/IR/GlobalVariable.h b/clang-r353983/include/llvm/IR/GlobalVariable.h
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+++ b/clang-r353983/include/llvm/IR/GlobalVariable.h
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+//===-- llvm/GlobalVariable.h - GlobalVariable class ------------*- 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 GlobalVariable class, which
+// represents a single global variable (or constant) in the VM.
+//
+// Global variables are constant pointers that refer to hunks of space that are
+// allocated by either the VM, or by the linker in a static compiler.  A global
+// variable may have an initial value, which is copied into the executables .data
+// area.  Global Constants are required to have initializers.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_IR_GLOBALVARIABLE_H
+#define LLVM_IR_GLOBALVARIABLE_H
+
+#include "llvm/ADT/PointerUnion.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/ADT/ilist_node.h"
+#include "llvm/IR/Attributes.h"
+#include "llvm/IR/GlobalObject.h"
+#include "llvm/IR/OperandTraits.h"
+#include "llvm/IR/Value.h"
+#include <cassert>
+#include <cstddef>
+
+namespace llvm {
+
+class Constant;
+class Module;
+
+template <typename ValueSubClass> class SymbolTableListTraits;
+class DIGlobalVariable;
+class DIGlobalVariableExpression;
+
+class GlobalVariable : public GlobalObject, public ilist_node<GlobalVariable> {
+  friend class SymbolTableListTraits<GlobalVariable>;
+
+  AttributeSet Attrs;
+  bool isConstantGlobal : 1;                   // Is this a global constant?
+  bool isExternallyInitializedConstant : 1;    // Is this a global whose value
+                                               // can change from its initial
+                                               // value before global
+                                               // initializers are run?
+
+public:
+  /// GlobalVariable ctor - If a parent module is specified, the global is
+  /// automatically inserted into the end of the specified modules global list.
+  GlobalVariable(Type *Ty, bool isConstant, LinkageTypes Linkage,
+                 Constant *Initializer = nullptr, const Twine &Name = "",
+                 ThreadLocalMode = NotThreadLocal, unsigned AddressSpace = 0,
+                 bool isExternallyInitialized = false);
+  /// GlobalVariable ctor - This creates a global and inserts it before the
+  /// specified other global.
+  GlobalVariable(Module &M, Type *Ty, bool isConstant,
+                 LinkageTypes Linkage, Constant *Initializer,
+                 const Twine &Name = "", GlobalVariable *InsertBefore = nullptr,
+                 ThreadLocalMode = NotThreadLocal, unsigned AddressSpace = 0,
+                 bool isExternallyInitialized = false);
+  GlobalVariable(const GlobalVariable &) = delete;
+  GlobalVariable &operator=(const GlobalVariable &) = delete;
+
+  ~GlobalVariable() {
+    dropAllReferences();
+  }
+
+  // allocate space for exactly one operand
+  void *operator new(size_t s) {
+    return User::operator new(s, 1);
+  }
+
+  // delete space for exactly one operand as created in the corresponding new operator
+  void operator delete(void *ptr){
+    assert(ptr != nullptr && "must not be nullptr");
+    User *Obj = static_cast<User *>(ptr);
+    // Number of operands can be set to 0 after construction and initialization. Make sure
+    // that number of operands is reset to 1, as this is needed in User::operator delete
+    Obj->setGlobalVariableNumOperands(1);
+    User::operator delete(Obj);
+  }
+
+  /// Provide fast operand accessors
+  DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
+
+  /// Definitions have initializers, declarations don't.
+  ///
+  inline bool hasInitializer() const { return !isDeclaration(); }
+
+  /// hasDefinitiveInitializer - Whether the global variable has an initializer,
+  /// and any other instances of the global (this can happen due to weak
+  /// linkage) are guaranteed to have the same initializer.
+  ///
+  /// Note that if you want to transform a global, you must use
+  /// hasUniqueInitializer() instead, because of the *_odr linkage type.
+  ///
+  /// Example:
+  ///
+  /// @a = global SomeType* null - Initializer is both definitive and unique.
+  ///
+  /// @b = global weak SomeType* null - Initializer is neither definitive nor
+  /// unique.
+  ///
+  /// @c = global weak_odr SomeType* null - Initializer is definitive, but not
+  /// unique.
+  inline bool hasDefinitiveInitializer() const {
+    return hasInitializer() &&
+      // The initializer of a global variable may change to something arbitrary
+      // at link time.
+      !isInterposable() &&
+      // The initializer of a global variable with the externally_initialized
+      // marker may change at runtime before C++ initializers are evaluated.
+      !isExternallyInitialized();
+  }
+
+  /// hasUniqueInitializer - Whether the global variable has an initializer, and
+  /// any changes made to the initializer will turn up in the final executable.
+  inline bool hasUniqueInitializer() const {
+    return
+        // We need to be sure this is the definition that will actually be used
+        isStrongDefinitionForLinker() &&
+        // It is not safe to modify initializers of global variables with the
+        // external_initializer marker since the value may be changed at runtime
+        // before C++ initializers are evaluated.
+        !isExternallyInitialized();
+  }
+
+  /// getInitializer - Return the initializer for this global variable.  It is
+  /// illegal to call this method if the global is external, because we cannot
+  /// tell what the value is initialized to!
+  ///
+  inline const Constant *getInitializer() const {
+    assert(hasInitializer() && "GV doesn't have initializer!");
+    return static_cast<Constant*>(Op<0>().get());
+  }
+  inline Constant *getInitializer() {
+    assert(hasInitializer() && "GV doesn't have initializer!");
+    return static_cast<Constant*>(Op<0>().get());
+  }
+  /// setInitializer - Sets the initializer for this global variable, removing
+  /// any existing initializer if InitVal==NULL.  If this GV has type T*, the
+  /// initializer must have type T.
+  void setInitializer(Constant *InitVal);
+
+  /// If the value is a global constant, its value is immutable throughout the
+  /// runtime execution of the program.  Assigning a value into the constant
+  /// leads to undefined behavior.
+  ///
+  bool isConstant() const { return isConstantGlobal; }
+  void setConstant(bool Val) { isConstantGlobal = Val; }
+
+  bool isExternallyInitialized() const {
+    return isExternallyInitializedConstant;
+  }
+  void setExternallyInitialized(bool Val) {
+    isExternallyInitializedConstant = Val;
+  }
+
+  /// copyAttributesFrom - copy all additional attributes (those not needed to
+  /// create a GlobalVariable) from the GlobalVariable Src to this one.
+  void copyAttributesFrom(const GlobalVariable *Src);
+
+  /// 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();
+
+  /// Drop all references in preparation to destroy the GlobalVariable. This
+  /// drops not only the reference to the initializer but also to any metadata.
+  void dropAllReferences();
+
+  /// Attach a DIGlobalVariableExpression.
+  void addDebugInfo(DIGlobalVariableExpression *GV);
+
+  /// Fill the vector with all debug info attachements.
+  void getDebugInfo(SmallVectorImpl<DIGlobalVariableExpression *> &GVs) const;
+
+  /// Add attribute to this global.
+  void addAttribute(Attribute::AttrKind Kind) {
+    Attrs = Attrs.addAttribute(getContext(), Kind);
+  }
+
+  /// Add attribute to this global.
+  void addAttribute(StringRef Kind, StringRef Val = StringRef()) {
+    Attrs = Attrs.addAttribute(getContext(), Kind, Val);
+  }
+
+  /// Return true if the attribute exists.
+  bool hasAttribute(Attribute::AttrKind Kind) const {
+    return Attrs.hasAttribute(Kind);
+  }
+
+  /// Return true if the attribute exists.
+  bool hasAttribute(StringRef Kind) const {
+    return Attrs.hasAttribute(Kind);
+  }
+
+  /// Return true if any attributes exist.
+  bool hasAttributes() const {
+    return Attrs.hasAttributes();
+  }
+
+  /// Return the attribute object.
+  Attribute getAttribute(Attribute::AttrKind Kind) const {
+    return Attrs.getAttribute(Kind);
+  }
+
+  /// Return the attribute object.
+  Attribute getAttribute(StringRef Kind) const {
+    return Attrs.getAttribute(Kind);
+  }
+
+  /// Return the attribute set for this global
+  AttributeSet getAttributes() const {
+    return Attrs;
+  }
+
+  /// Return attribute set as list with index.
+  /// FIXME: This may not be required once ValueEnumerators
+  /// in bitcode-writer can enumerate attribute-set.
+  AttributeList getAttributesAsList(unsigned index) const {
+    if (!hasAttributes())
+      return AttributeList();
+    std::pair<unsigned, AttributeSet> AS[1] = {{index, Attrs}};
+    return AttributeList::get(getContext(), AS);
+  }
+
+  /// Set attribute list for this global
+  void setAttributes(AttributeSet A) {
+    Attrs = A;
+  }
+
+  /// Check if section name is present
+  bool hasImplicitSection() const {
+    return getAttributes().hasAttribute("bss-section") ||
+           getAttributes().hasAttribute("data-section") ||
+           getAttributes().hasAttribute("rodata-section");
+  }
+
+  // Methods for support type inquiry through isa, cast, and dyn_cast:
+  static bool classof(const Value *V) {
+    return V->getValueID() == Value::GlobalVariableVal;
+  }
+};
+
+template <>
+struct OperandTraits<GlobalVariable> :
+  public OptionalOperandTraits<GlobalVariable> {
+};
+
+DEFINE_TRANSPARENT_OPERAND_ACCESSORS(GlobalVariable, Value)
+
+} // end namespace llvm
+
+#endif // LLVM_IR_GLOBALVARIABLE_H