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

1 files changed, 500 insertions, 0 deletions

diff --git a/clang-r353983/include/clang/Sema/Scope.h b/clang-r353983/include/clang/Sema/Scope.h
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+//===- Scope.h - Scope interface --------------------------------*- 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 defines the Scope interface.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_SEMA_SCOPE_H
+#define LLVM_CLANG_SEMA_SCOPE_H
+
+#include "clang/AST/Decl.h"
+#include "clang/Basic/Diagnostic.h"
+#include "llvm/ADT/PointerIntPair.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/iterator_range.h"
+#include <cassert>
+
+namespace llvm {
+
+class raw_ostream;
+
+} // namespace llvm
+
+namespace clang {
+
+class Decl;
+class DeclContext;
+class UsingDirectiveDecl;
+class VarDecl;
+
+/// Scope - A scope is a transient data structure that is used while parsing the
+/// program.  It assists with resolving identifiers to the appropriate
+/// declaration.
+class Scope {
+public:
+  /// ScopeFlags - These are bitfields that are or'd together when creating a
+  /// scope, which defines the sorts of things the scope contains.
+  enum ScopeFlags {
+    /// This indicates that the scope corresponds to a function, which
+    /// means that labels are set here.
+    FnScope       = 0x01,
+
+    /// This is a while, do, switch, for, etc that can have break
+    /// statements embedded into it.
+    BreakScope    = 0x02,
+
+    /// This is a while, do, for, which can have continue statements
+    /// embedded into it.
+    ContinueScope = 0x04,
+
+    /// This is a scope that can contain a declaration.  Some scopes
+    /// just contain loop constructs but don't contain decls.
+    DeclScope = 0x08,
+
+    /// The controlling scope in a if/switch/while/for statement.
+    ControlScope = 0x10,
+
+    /// The scope of a struct/union/class definition.
+    ClassScope = 0x20,
+
+    /// This is a scope that corresponds to a block/closure object.
+    /// Blocks serve as top-level scopes for some objects like labels, they
+    /// also prevent things like break and continue.  BlockScopes always have
+    /// the FnScope and DeclScope flags set as well.
+    BlockScope = 0x40,
+
+    /// This is a scope that corresponds to the
+    /// template parameters of a C++ template. Template parameter
+    /// scope starts at the 'template' keyword and ends when the
+    /// template declaration ends.
+    TemplateParamScope = 0x80,
+
+    /// This is a scope that corresponds to the
+    /// parameters within a function prototype.
+    FunctionPrototypeScope = 0x100,
+
+    /// This is a scope that corresponds to the parameters within
+    /// a function prototype for a function declaration (as opposed to any
+    /// other kind of function declarator). Always has FunctionPrototypeScope
+    /// set as well.
+    FunctionDeclarationScope = 0x200,
+
+    /// This is a scope that corresponds to the Objective-C
+    /// \@catch statement.
+    AtCatchScope = 0x400,
+
+    /// This scope corresponds to an Objective-C method body.
+    /// It always has FnScope and DeclScope set as well.
+    ObjCMethodScope = 0x800,
+
+    /// This is a scope that corresponds to a switch statement.
+    SwitchScope = 0x1000,
+
+    /// This is the scope of a C++ try statement.
+    TryScope = 0x2000,
+
+    /// This is the scope for a function-level C++ try or catch scope.
+    FnTryCatchScope = 0x4000,
+
+    /// This is the scope of OpenMP executable directive.
+    OpenMPDirectiveScope = 0x8000,
+
+    /// This is the scope of some OpenMP loop directive.
+    OpenMPLoopDirectiveScope = 0x10000,
+
+    /// This is the scope of some OpenMP simd directive.
+    /// For example, it is used for 'omp simd', 'omp for simd'.
+    /// This flag is propagated to children scopes.
+    OpenMPSimdDirectiveScope = 0x20000,
+
+    /// This scope corresponds to an enum.
+    EnumScope = 0x40000,
+
+    /// This scope corresponds to an SEH try.
+    SEHTryScope = 0x80000,
+
+    /// This scope corresponds to an SEH except.
+    SEHExceptScope = 0x100000,
+
+    /// We are currently in the filter expression of an SEH except block.
+    SEHFilterScope = 0x200000,
+
+    /// This is a compound statement scope.
+    CompoundStmtScope = 0x400000,
+
+    /// We are between inheritance colon and the real class/struct definition scope.
+    ClassInheritanceScope = 0x800000,
+  };
+
+private:
+  /// The parent scope for this scope.  This is null for the translation-unit
+  /// scope.
+  Scope *AnyParent;
+
+  /// Flags - This contains a set of ScopeFlags, which indicates how the scope
+  /// interrelates with other control flow statements.
+  unsigned Flags;
+
+  /// Depth - This is the depth of this scope.  The translation-unit scope has
+  /// depth 0.
+  unsigned short Depth;
+
+  /// Declarations with static linkage are mangled with the number of
+  /// scopes seen as a component.
+  unsigned short MSLastManglingNumber;
+
+  unsigned short MSCurManglingNumber;
+
+  /// PrototypeDepth - This is the number of function prototype scopes
+  /// enclosing this scope, including this scope.
+  unsigned short PrototypeDepth;
+
+  /// PrototypeIndex - This is the number of parameters currently
+  /// declared in this scope.
+  unsigned short PrototypeIndex;
+
+  /// FnParent - If this scope has a parent scope that is a function body, this
+  /// pointer is non-null and points to it.  This is used for label processing.
+  Scope *FnParent;
+  Scope *MSLastManglingParent;
+
+  /// BreakParent/ContinueParent - This is a direct link to the innermost
+  /// BreakScope/ContinueScope which contains the contents of this scope
+  /// for control flow purposes (and might be this scope itself), or null
+  /// if there is no such scope.
+  Scope *BreakParent, *ContinueParent;
+
+  /// BlockParent - This is a direct link to the immediately containing
+  /// BlockScope if this scope is not one, or null if there is none.
+  Scope *BlockParent;
+
+  /// TemplateParamParent - This is a direct link to the
+  /// immediately containing template parameter scope. In the
+  /// case of nested templates, template parameter scopes can have
+  /// other template parameter scopes as parents.
+  Scope *TemplateParamParent;
+
+  /// DeclsInScope - This keeps track of all declarations in this scope.  When
+  /// the declaration is added to the scope, it is set as the current
+  /// declaration for the identifier in the IdentifierTable.  When the scope is
+  /// popped, these declarations are removed from the IdentifierTable's notion
+  /// of current declaration.  It is up to the current Action implementation to
+  /// implement these semantics.
+  using DeclSetTy = llvm::SmallPtrSet<Decl *, 32>;
+  DeclSetTy DeclsInScope;
+
+  /// The DeclContext with which this scope is associated. For
+  /// example, the entity of a class scope is the class itself, the
+  /// entity of a function scope is a function, etc.
+  DeclContext *Entity;
+
+  using UsingDirectivesTy = SmallVector<UsingDirectiveDecl *, 2>;
+  UsingDirectivesTy UsingDirectives;
+
+  /// Used to determine if errors occurred in this scope.
+  DiagnosticErrorTrap ErrorTrap;
+
+  /// A lattice consisting of undefined, a single NRVO candidate variable in
+  /// this scope, or over-defined. The bit is true when over-defined.
+  llvm::PointerIntPair<VarDecl *, 1, bool> NRVO;
+
+  void setFlags(Scope *Parent, unsigned F);
+
+public:
+  Scope(Scope *Parent, unsigned ScopeFlags, DiagnosticsEngine &Diag)
+      : ErrorTrap(Diag) {
+    Init(Parent, ScopeFlags);
+  }
+
+  /// getFlags - Return the flags for this scope.
+  unsigned getFlags() const { return Flags; }
+
+  void setFlags(unsigned F) { setFlags(getParent(), F); }
+
+  /// isBlockScope - Return true if this scope correspond to a closure.
+  bool isBlockScope() const { return Flags & BlockScope; }
+
+  /// getParent - Return the scope that this is nested in.
+  const Scope *getParent() const { return AnyParent; }
+  Scope *getParent() { return AnyParent; }
+
+  /// getFnParent - Return the closest scope that is a function body.
+  const Scope *getFnParent() const { return FnParent; }
+  Scope *getFnParent() { return FnParent; }
+
+  const Scope *getMSLastManglingParent() const {
+    return MSLastManglingParent;
+  }
+  Scope *getMSLastManglingParent() { return MSLastManglingParent; }
+
+  /// getContinueParent - Return the closest scope that a continue statement
+  /// would be affected by.
+  Scope *getContinueParent() {
+    return ContinueParent;
+  }
+
+  const Scope *getContinueParent() const {
+    return const_cast<Scope*>(this)->getContinueParent();
+  }
+
+  /// getBreakParent - Return the closest scope that a break statement
+  /// would be affected by.
+  Scope *getBreakParent() {
+    return BreakParent;
+  }
+  const Scope *getBreakParent() const {
+    return const_cast<Scope*>(this)->getBreakParent();
+  }
+
+  Scope *getBlockParent() { return BlockParent; }
+  const Scope *getBlockParent() const { return BlockParent; }
+
+  Scope *getTemplateParamParent() { return TemplateParamParent; }
+  const Scope *getTemplateParamParent() const { return TemplateParamParent; }
+
+  /// Returns the depth of this scope. The translation-unit has scope depth 0.
+  unsigned getDepth() const { return Depth; }
+
+  /// Returns the number of function prototype scopes in this scope
+  /// chain.
+  unsigned getFunctionPrototypeDepth() const {
+    return PrototypeDepth;
+  }
+
+  /// Return the number of parameters declared in this function
+  /// prototype, increasing it by one for the next call.
+  unsigned getNextFunctionPrototypeIndex() {
+    assert(isFunctionPrototypeScope());
+    return PrototypeIndex++;
+  }
+
+  using decl_range = llvm::iterator_range<DeclSetTy::iterator>;
+
+  decl_range decls() const {
+    return decl_range(DeclsInScope.begin(), DeclsInScope.end());
+  }
+
+  bool decl_empty() const { return DeclsInScope.empty(); }
+
+  void AddDecl(Decl *D) {
+    DeclsInScope.insert(D);
+  }
+
+  void RemoveDecl(Decl *D) {
+    DeclsInScope.erase(D);
+  }
+
+  void incrementMSManglingNumber() {
+    if (Scope *MSLMP = getMSLastManglingParent()) {
+      MSLMP->MSLastManglingNumber += 1;
+      MSCurManglingNumber += 1;
+    }
+  }
+
+  void decrementMSManglingNumber() {
+    if (Scope *MSLMP = getMSLastManglingParent()) {
+      MSLMP->MSLastManglingNumber -= 1;
+      MSCurManglingNumber -= 1;
+    }
+  }
+
+  unsigned getMSLastManglingNumber() const {
+    if (const Scope *MSLMP = getMSLastManglingParent())
+      return MSLMP->MSLastManglingNumber;
+    return 1;
+  }
+
+  unsigned getMSCurManglingNumber() const {
+    return MSCurManglingNumber;
+  }
+
+  /// isDeclScope - Return true if this is the scope that the specified decl is
+  /// declared in.
+  bool isDeclScope(Decl *D) {
+    return DeclsInScope.count(D) != 0;
+  }
+
+  DeclContext *getEntity() const { return Entity; }
+  void setEntity(DeclContext *E) { Entity = E; }
+
+  bool hasErrorOccurred() const { return ErrorTrap.hasErrorOccurred(); }
+
+  bool hasUnrecoverableErrorOccurred() const {
+    return ErrorTrap.hasUnrecoverableErrorOccurred();
+  }
+
+  /// isFunctionScope() - Return true if this scope is a function scope.
+  bool isFunctionScope() const { return (getFlags() & Scope::FnScope); }
+
+  /// isClassScope - Return true if this scope is a class/struct/union scope.
+  bool isClassScope() const {
+    return (getFlags() & Scope::ClassScope);
+  }
+
+  /// isInCXXInlineMethodScope - Return true if this scope is a C++ inline
+  /// method scope or is inside one.
+  bool isInCXXInlineMethodScope() const {
+    if (const Scope *FnS = getFnParent()) {
+      assert(FnS->getParent() && "TUScope not created?");
+      return FnS->getParent()->isClassScope();
+    }
+    return false;
+  }
+
+  /// isInObjcMethodScope - Return true if this scope is, or is contained in, an
+  /// Objective-C method body.  Note that this method is not constant time.
+  bool isInObjcMethodScope() const {
+    for (const Scope *S = this; S; S = S->getParent()) {
+      // If this scope is an objc method scope, then we succeed.
+      if (S->getFlags() & ObjCMethodScope)
+        return true;
+    }
+    return false;
+  }
+
+  /// isInObjcMethodOuterScope - Return true if this scope is an
+  /// Objective-C method outer most body.
+  bool isInObjcMethodOuterScope() const {
+    if (const Scope *S = this) {
+      // If this scope is an objc method scope, then we succeed.
+      if (S->getFlags() & ObjCMethodScope)
+        return true;
+    }
+    return false;
+  }
+
+  /// isTemplateParamScope - Return true if this scope is a C++
+  /// template parameter scope.
+  bool isTemplateParamScope() const {
+    return getFlags() & Scope::TemplateParamScope;
+  }
+
+  /// isFunctionPrototypeScope - Return true if this scope is a
+  /// function prototype scope.
+  bool isFunctionPrototypeScope() const {
+    return getFlags() & Scope::FunctionPrototypeScope;
+  }
+
+  /// isAtCatchScope - Return true if this scope is \@catch.
+  bool isAtCatchScope() const {
+    return getFlags() & Scope::AtCatchScope;
+  }
+
+  /// isSwitchScope - Return true if this scope is a switch scope.
+  bool isSwitchScope() const {
+    for (const Scope *S = this; S; S = S->getParent()) {
+      if (S->getFlags() & Scope::SwitchScope)
+        return true;
+      else if (S->getFlags() & (Scope::FnScope | Scope::ClassScope |
+                                Scope::BlockScope | Scope::TemplateParamScope |
+                                Scope::FunctionPrototypeScope |
+                                Scope::AtCatchScope | Scope::ObjCMethodScope))
+        return false;
+    }
+    return false;
+  }
+
+  /// Determines whether this scope is the OpenMP directive scope
+  bool isOpenMPDirectiveScope() const {
+    return (getFlags() & Scope::OpenMPDirectiveScope);
+  }
+
+  /// Determine whether this scope is some OpenMP loop directive scope
+  /// (for example, 'omp for', 'omp simd').
+  bool isOpenMPLoopDirectiveScope() const {
+    if (getFlags() & Scope::OpenMPLoopDirectiveScope) {
+      assert(isOpenMPDirectiveScope() &&
+             "OpenMP loop directive scope is not a directive scope");
+      return true;
+    }
+    return false;
+  }
+
+  /// Determine whether this scope is (or is nested into) some OpenMP
+  /// loop simd directive scope (for example, 'omp simd', 'omp for simd').
+  bool isOpenMPSimdDirectiveScope() const {
+    return getFlags() & Scope::OpenMPSimdDirectiveScope;
+  }
+
+  /// Determine whether this scope is a loop having OpenMP loop
+  /// directive attached.
+  bool isOpenMPLoopScope() const {
+    const Scope *P = getParent();
+    return P && P->isOpenMPLoopDirectiveScope();
+  }
+
+  /// Determine whether this scope is a C++ 'try' block.
+  bool isTryScope() const { return getFlags() & Scope::TryScope; }
+
+  /// Determine whether this scope is a SEH '__try' block.
+  bool isSEHTryScope() const { return getFlags() & Scope::SEHTryScope; }
+
+  /// Determine whether this scope is a SEH '__except' block.
+  bool isSEHExceptScope() const { return getFlags() & Scope::SEHExceptScope; }
+
+  /// Determine whether this scope is a compound statement scope.
+  bool isCompoundStmtScope() const {
+    return getFlags() & Scope::CompoundStmtScope;
+  }
+
+  /// Returns if rhs has a higher scope depth than this.
+  ///
+  /// The caller is responsible for calling this only if one of the two scopes
+  /// is an ancestor of the other.
+  bool Contains(const Scope& rhs) const { return Depth < rhs.Depth; }
+
+  /// containedInPrototypeScope - Return true if this or a parent scope
+  /// is a FunctionPrototypeScope.
+  bool containedInPrototypeScope() const;
+
+  void PushUsingDirective(UsingDirectiveDecl *UDir) {
+    UsingDirectives.push_back(UDir);
+  }
+
+  using using_directives_range =
+      llvm::iterator_range<UsingDirectivesTy::iterator>;
+
+  using_directives_range using_directives() {
+    return using_directives_range(UsingDirectives.begin(),
+                                  UsingDirectives.end());
+  }
+
+  void addNRVOCandidate(VarDecl *VD) {
+    if (NRVO.getInt())
+      return;
+    if (NRVO.getPointer() == nullptr) {
+      NRVO.setPointer(VD);
+      return;
+    }
+    if (NRVO.getPointer() != VD)
+      setNoNRVO();
+  }
+
+  void setNoNRVO() {
+    NRVO.setInt(true);
+    NRVO.setPointer(nullptr);
+  }
+
+  void mergeNRVOIntoParent();
+
+  /// Init - This is used by the parser to implement scope caching.
+  void Init(Scope *parent, unsigned flags);
+
+  /// Sets up the specified scope flags and adjusts the scope state
+  /// variables accordingly.
+  void AddFlags(unsigned Flags);
+
+  void dumpImpl(raw_ostream &OS) const;
+  void dump() const;
+};
+
+} // namespace clang
+
+#endif // LLVM_CLANG_SEMA_SCOPE_H