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24aec16dda
Exception handling SHOULD be possible depending on codegen (and if not, we can make it trap and add a warning when we make that decision), but throwing out of a compute construct is ill formed. This patch adds an error for a 'throw' that isn't in a 'try' scope. This error is imperfect as it won't diagnose a 'throw' that escapes its 'try', or one in a separate function, but it catches the obvious mistakes. The other cases will need to be handled as runtime failures.
616 lines
21 KiB
C++
616 lines
21 KiB
C++
//===- Scope.h - Scope interface --------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the Scope interface.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_SEMA_SCOPE_H
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#define LLVM_CLANG_SEMA_SCOPE_H
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#include "clang/AST/Decl.h"
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#include "clang/Basic/Diagnostic.h"
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#include "llvm/ADT/PointerIntPair.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/iterator_range.h"
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#include <cassert>
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#include <optional>
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namespace llvm {
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class raw_ostream;
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} // namespace llvm
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namespace clang {
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class Decl;
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class DeclContext;
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class UsingDirectiveDecl;
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class VarDecl;
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/// Scope - A scope is a transient data structure that is used while parsing the
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/// program. It assists with resolving identifiers to the appropriate
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/// declaration.
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class Scope {
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public:
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/// ScopeFlags - These are bitfields that are or'd together when creating a
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/// scope, which defines the sorts of things the scope contains.
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enum ScopeFlags {
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// A bitfield value representing no scopes.
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NoScope = 0,
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/// This indicates that the scope corresponds to a function, which
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/// means that labels are set here.
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FnScope = 0x01,
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/// This is a while, do, switch, for, etc that can have break
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/// statements embedded into it.
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BreakScope = 0x02,
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/// This is a while, do, for, which can have continue statements
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/// embedded into it.
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ContinueScope = 0x04,
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/// This is a scope that can contain a declaration. Some scopes
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/// just contain loop constructs but don't contain decls.
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DeclScope = 0x08,
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/// The controlling scope in a if/switch/while/for statement.
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ControlScope = 0x10,
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/// The scope of a struct/union/class definition.
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ClassScope = 0x20,
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/// This is a scope that corresponds to a block/closure object.
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/// Blocks serve as top-level scopes for some objects like labels, they
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/// also prevent things like break and continue. BlockScopes always have
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/// the FnScope and DeclScope flags set as well.
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BlockScope = 0x40,
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/// This is a scope that corresponds to the
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/// template parameters of a C++ template. Template parameter
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/// scope starts at the 'template' keyword and ends when the
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/// template declaration ends.
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TemplateParamScope = 0x80,
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/// This is a scope that corresponds to the
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/// parameters within a function prototype.
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FunctionPrototypeScope = 0x100,
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/// This is a scope that corresponds to the parameters within
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/// a function prototype for a function declaration (as opposed to any
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/// other kind of function declarator). Always has FunctionPrototypeScope
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/// set as well.
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FunctionDeclarationScope = 0x200,
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/// This is a scope that corresponds to the Objective-C
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/// \@catch statement.
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AtCatchScope = 0x400,
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/// This scope corresponds to an Objective-C method body.
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/// It always has FnScope and DeclScope set as well.
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ObjCMethodScope = 0x800,
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/// This is a scope that corresponds to a switch statement.
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SwitchScope = 0x1000,
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/// This is the scope of a C++ try statement.
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TryScope = 0x2000,
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/// This is the scope for a function-level C++ try or catch scope.
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FnTryCatchScope = 0x4000,
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/// This is the scope of OpenMP executable directive.
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OpenMPDirectiveScope = 0x8000,
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/// This is the scope of some OpenMP loop directive.
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OpenMPLoopDirectiveScope = 0x10000,
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/// This is the scope of some OpenMP simd directive.
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/// For example, it is used for 'omp simd', 'omp for simd'.
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/// This flag is propagated to children scopes.
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OpenMPSimdDirectiveScope = 0x20000,
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/// This scope corresponds to an enum.
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EnumScope = 0x40000,
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/// This scope corresponds to an SEH try.
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SEHTryScope = 0x80000,
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/// This scope corresponds to an SEH except.
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SEHExceptScope = 0x100000,
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/// We are currently in the filter expression of an SEH except block.
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SEHFilterScope = 0x200000,
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/// This is a compound statement scope.
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CompoundStmtScope = 0x400000,
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/// We are between inheritance colon and the real class/struct definition
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/// scope.
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ClassInheritanceScope = 0x800000,
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/// This is the scope of a C++ catch statement.
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CatchScope = 0x1000000,
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/// This is a scope in which a condition variable is currently being
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/// parsed. If such a scope is a ContinueScope, it's invalid to jump to the
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/// continue block from here.
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ConditionVarScope = 0x2000000,
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/// This is a scope of some OpenMP directive with
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/// order clause which specifies concurrent
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OpenMPOrderClauseScope = 0x4000000,
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/// This is the scope for a lambda, after the lambda introducer.
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/// Lambdas need two FunctionPrototypeScope scopes (because there is a
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/// template scope in between), the outer scope does not increase the
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/// depth of recursion.
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LambdaScope = 0x8000000,
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/// This is the scope of an OpenACC Compute Construct, which restricts
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/// jumping into/out of it.
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OpenACCComputeConstructScope = 0x10000000,
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};
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private:
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/// The parent scope for this scope. This is null for the translation-unit
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/// scope.
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Scope *AnyParent;
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/// Flags - This contains a set of ScopeFlags, which indicates how the scope
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/// interrelates with other control flow statements.
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unsigned Flags;
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/// Depth - This is the depth of this scope. The translation-unit scope has
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/// depth 0.
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unsigned short Depth;
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/// Declarations with static linkage are mangled with the number of
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/// scopes seen as a component.
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unsigned short MSLastManglingNumber;
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unsigned short MSCurManglingNumber;
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/// PrototypeDepth - This is the number of function prototype scopes
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/// enclosing this scope, including this scope.
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unsigned short PrototypeDepth;
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/// PrototypeIndex - This is the number of parameters currently
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/// declared in this scope.
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unsigned short PrototypeIndex;
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/// FnParent - If this scope has a parent scope that is a function body, this
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/// pointer is non-null and points to it. This is used for label processing.
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Scope *FnParent;
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Scope *MSLastManglingParent;
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/// BreakParent/ContinueParent - This is a direct link to the innermost
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/// BreakScope/ContinueScope which contains the contents of this scope
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/// for control flow purposes (and might be this scope itself), or null
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/// if there is no such scope.
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Scope *BreakParent, *ContinueParent;
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/// BlockParent - This is a direct link to the immediately containing
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/// BlockScope if this scope is not one, or null if there is none.
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Scope *BlockParent;
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/// TemplateParamParent - This is a direct link to the
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/// immediately containing template parameter scope. In the
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/// case of nested templates, template parameter scopes can have
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/// other template parameter scopes as parents.
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Scope *TemplateParamParent;
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/// DeclsInScope - This keeps track of all declarations in this scope. When
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/// the declaration is added to the scope, it is set as the current
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/// declaration for the identifier in the IdentifierTable. When the scope is
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/// popped, these declarations are removed from the IdentifierTable's notion
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/// of current declaration. It is up to the current Action implementation to
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/// implement these semantics.
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using DeclSetTy = llvm::SmallPtrSet<Decl *, 32>;
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DeclSetTy DeclsInScope;
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/// The DeclContext with which this scope is associated. For
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/// example, the entity of a class scope is the class itself, the
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/// entity of a function scope is a function, etc.
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DeclContext *Entity;
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using UsingDirectivesTy = SmallVector<UsingDirectiveDecl *, 2>;
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UsingDirectivesTy UsingDirectives;
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/// Used to determine if errors occurred in this scope.
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DiagnosticErrorTrap ErrorTrap;
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/// A single NRVO candidate variable in this scope.
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/// There are three possible values:
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/// 1) pointer to VarDecl that denotes NRVO candidate itself.
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/// 2) nullptr value means that NRVO is not allowed in this scope
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/// (e.g. return a function parameter).
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/// 3) std::nullopt value means that there is no NRVO candidate in this scope
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/// (i.e. there are no return statements in this scope).
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std::optional<VarDecl *> NRVO;
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/// Represents return slots for NRVO candidates in the current scope.
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/// If a variable is present in this set, it means that a return slot is
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/// available for this variable in the current scope.
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llvm::SmallPtrSet<VarDecl *, 8> ReturnSlots;
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void setFlags(Scope *Parent, unsigned F);
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public:
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Scope(Scope *Parent, unsigned ScopeFlags, DiagnosticsEngine &Diag)
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: ErrorTrap(Diag) {
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Init(Parent, ScopeFlags);
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}
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/// getFlags - Return the flags for this scope.
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unsigned getFlags() const { return Flags; }
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void setFlags(unsigned F) { setFlags(getParent(), F); }
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/// isBlockScope - Return true if this scope correspond to a closure.
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bool isBlockScope() const { return Flags & BlockScope; }
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/// getParent - Return the scope that this is nested in.
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const Scope *getParent() const { return AnyParent; }
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Scope *getParent() { return AnyParent; }
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/// getFnParent - Return the closest scope that is a function body.
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const Scope *getFnParent() const { return FnParent; }
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Scope *getFnParent() { return FnParent; }
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const Scope *getMSLastManglingParent() const {
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return MSLastManglingParent;
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}
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Scope *getMSLastManglingParent() { return MSLastManglingParent; }
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/// getContinueParent - Return the closest scope that a continue statement
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/// would be affected by.
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Scope *getContinueParent() {
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return ContinueParent;
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}
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const Scope *getContinueParent() const {
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return const_cast<Scope*>(this)->getContinueParent();
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}
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// Set whether we're in the scope of a condition variable, where 'continue'
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// is disallowed despite being a continue scope.
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void setIsConditionVarScope(bool InConditionVarScope) {
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Flags = (Flags & ~ConditionVarScope) |
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(InConditionVarScope ? ConditionVarScope : 0);
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}
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bool isConditionVarScope() const {
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return Flags & ConditionVarScope;
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}
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/// getBreakParent - Return the closest scope that a break statement
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/// would be affected by.
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Scope *getBreakParent() {
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return BreakParent;
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}
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const Scope *getBreakParent() const {
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return const_cast<Scope*>(this)->getBreakParent();
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}
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Scope *getBlockParent() { return BlockParent; }
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const Scope *getBlockParent() const { return BlockParent; }
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Scope *getTemplateParamParent() { return TemplateParamParent; }
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const Scope *getTemplateParamParent() const { return TemplateParamParent; }
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/// Returns the depth of this scope. The translation-unit has scope depth 0.
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unsigned getDepth() const { return Depth; }
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/// Returns the number of function prototype scopes in this scope
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/// chain.
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unsigned getFunctionPrototypeDepth() const {
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return PrototypeDepth;
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}
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/// Return the number of parameters declared in this function
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/// prototype, increasing it by one for the next call.
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unsigned getNextFunctionPrototypeIndex() {
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assert(isFunctionPrototypeScope());
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return PrototypeIndex++;
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}
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using decl_range = llvm::iterator_range<DeclSetTy::iterator>;
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decl_range decls() const {
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return decl_range(DeclsInScope.begin(), DeclsInScope.end());
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}
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bool decl_empty() const { return DeclsInScope.empty(); }
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void AddDecl(Decl *D) {
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if (auto *VD = dyn_cast<VarDecl>(D))
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if (!isa<ParmVarDecl>(VD))
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ReturnSlots.insert(VD);
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DeclsInScope.insert(D);
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}
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void RemoveDecl(Decl *D) { DeclsInScope.erase(D); }
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void incrementMSManglingNumber() {
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if (Scope *MSLMP = getMSLastManglingParent()) {
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MSLMP->MSLastManglingNumber += 1;
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MSCurManglingNumber += 1;
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}
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}
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void decrementMSManglingNumber() {
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if (Scope *MSLMP = getMSLastManglingParent()) {
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MSLMP->MSLastManglingNumber -= 1;
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MSCurManglingNumber -= 1;
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}
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}
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unsigned getMSLastManglingNumber() const {
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if (const Scope *MSLMP = getMSLastManglingParent())
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return MSLMP->MSLastManglingNumber;
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return 1;
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}
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unsigned getMSCurManglingNumber() const {
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return MSCurManglingNumber;
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}
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/// isDeclScope - Return true if this is the scope that the specified decl is
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/// declared in.
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bool isDeclScope(const Decl *D) const { return DeclsInScope.contains(D); }
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/// Get the entity corresponding to this scope.
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DeclContext *getEntity() const {
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return isTemplateParamScope() ? nullptr : Entity;
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}
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/// Get the DeclContext in which to continue unqualified lookup after a
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/// lookup in this scope.
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DeclContext *getLookupEntity() const { return Entity; }
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void setEntity(DeclContext *E) {
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assert(!isTemplateParamScope() &&
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"entity associated with template param scope");
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Entity = E;
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}
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void setLookupEntity(DeclContext *E) { Entity = E; }
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/// Determine whether any unrecoverable errors have occurred within this
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/// scope. Note that this may return false even if the scope contains invalid
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/// declarations or statements, if the errors for those invalid constructs
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/// were suppressed because some prior invalid construct was referenced.
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bool hasUnrecoverableErrorOccurred() const {
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return ErrorTrap.hasUnrecoverableErrorOccurred();
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}
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/// isFunctionScope() - Return true if this scope is a function scope.
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bool isFunctionScope() const { return getFlags() & Scope::FnScope; }
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/// isClassScope - Return true if this scope is a class/struct/union scope.
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bool isClassScope() const { return getFlags() & Scope::ClassScope; }
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/// Determines whether this scope is between inheritance colon and the real
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/// class/struct definition.
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bool isClassInheritanceScope() const {
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return getFlags() & Scope::ClassInheritanceScope;
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}
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/// isInCXXInlineMethodScope - Return true if this scope is a C++ inline
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/// method scope or is inside one.
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bool isInCXXInlineMethodScope() const {
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if (const Scope *FnS = getFnParent()) {
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assert(FnS->getParent() && "TUScope not created?");
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return FnS->getParent()->isClassScope();
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}
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return false;
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}
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/// isInObjcMethodScope - Return true if this scope is, or is contained in, an
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/// Objective-C method body. Note that this method is not constant time.
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bool isInObjcMethodScope() const {
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for (const Scope *S = this; S; S = S->getParent()) {
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// If this scope is an objc method scope, then we succeed.
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if (S->getFlags() & ObjCMethodScope)
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return true;
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}
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return false;
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}
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/// isInObjcMethodOuterScope - Return true if this scope is an
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/// Objective-C method outer most body.
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bool isInObjcMethodOuterScope() const {
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if (const Scope *S = this) {
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// If this scope is an objc method scope, then we succeed.
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if (S->getFlags() & ObjCMethodScope)
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return true;
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}
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return false;
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}
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/// isTemplateParamScope - Return true if this scope is a C++
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/// template parameter scope.
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bool isTemplateParamScope() const {
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return getFlags() & Scope::TemplateParamScope;
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}
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/// isFunctionPrototypeScope - Return true if this scope is a
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/// function prototype scope.
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bool isFunctionPrototypeScope() const {
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return getFlags() & Scope::FunctionPrototypeScope;
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}
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/// isFunctionDeclarationScope - Return true if this scope is a
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/// function prototype scope.
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bool isFunctionDeclarationScope() const {
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return getFlags() & Scope::FunctionDeclarationScope;
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}
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/// isAtCatchScope - Return true if this scope is \@catch.
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bool isAtCatchScope() const {
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return getFlags() & Scope::AtCatchScope;
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}
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/// isCatchScope - Return true if this scope is a C++ catch statement.
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bool isCatchScope() const { return getFlags() & Scope::CatchScope; }
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/// isSwitchScope - Return true if this scope is a switch scope.
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bool isSwitchScope() const {
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for (const Scope *S = this; S; S = S->getParent()) {
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if (S->getFlags() & Scope::SwitchScope)
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return true;
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else if (S->getFlags() & (Scope::FnScope | Scope::ClassScope |
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Scope::BlockScope | Scope::TemplateParamScope |
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Scope::FunctionPrototypeScope |
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Scope::AtCatchScope | Scope::ObjCMethodScope))
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return false;
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}
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return false;
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}
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/// Return true if this scope is a loop.
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bool isLoopScope() const {
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// 'switch' is the only loop that is not a 'break' scope as well, so we can
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// just check BreakScope and not SwitchScope.
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return (getFlags() & Scope::BreakScope) &&
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!(getFlags() & Scope::SwitchScope);
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}
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/// Determines whether this scope is the OpenMP directive scope
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bool isOpenMPDirectiveScope() const {
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return (getFlags() & Scope::OpenMPDirectiveScope);
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}
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/// Determine whether this scope is some OpenMP loop directive scope
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/// (for example, 'omp for', 'omp simd').
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bool isOpenMPLoopDirectiveScope() const {
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if (getFlags() & Scope::OpenMPLoopDirectiveScope) {
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assert(isOpenMPDirectiveScope() &&
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"OpenMP loop directive scope is not a directive scope");
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return true;
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}
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return false;
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}
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/// Determine whether this scope is (or is nested into) some OpenMP
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/// loop simd directive scope (for example, 'omp simd', 'omp for simd').
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bool isOpenMPSimdDirectiveScope() const {
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return getFlags() & Scope::OpenMPSimdDirectiveScope;
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}
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/// Determine whether this scope is a loop having OpenMP loop
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/// directive attached.
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bool isOpenMPLoopScope() const {
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const Scope *P = getParent();
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return P && P->isOpenMPLoopDirectiveScope();
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}
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/// Determine whether this scope is some OpenMP directive with
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|
/// order clause which specifies concurrent scope.
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|
bool isOpenMPOrderClauseScope() const {
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|
return getFlags() & Scope::OpenMPOrderClauseScope;
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|
}
|
|
|
|
/// Determine whether this scope is the statement associated with an OpenACC
|
|
/// Compute construct directive.
|
|
bool isOpenACCComputeConstructScope() const {
|
|
return getFlags() & Scope::OpenACCComputeConstructScope;
|
|
}
|
|
|
|
/// Determine if this scope (or its parents) are a compute construct. If the
|
|
/// argument is provided, the search will stop at any of the specified scopes.
|
|
/// Otherwise, it will stop only at the normal 'no longer search' scopes.
|
|
bool isInOpenACCComputeConstructScope(ScopeFlags Flags = NoScope) const {
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|
for (const Scope *S = this; S; S = S->getParent()) {
|
|
if (S->isOpenACCComputeConstructScope())
|
|
return true;
|
|
|
|
if (S->getFlags() & Flags)
|
|
return false;
|
|
|
|
else if (S->getFlags() &
|
|
(Scope::FnScope | Scope::ClassScope | Scope::BlockScope |
|
|
Scope::TemplateParamScope | Scope::FunctionPrototypeScope |
|
|
Scope::AtCatchScope | Scope::ObjCMethodScope))
|
|
return false;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/// Determine whether this scope is a while/do/for statement, which can have
|
|
/// continue statements embedded into it.
|
|
bool isContinueScope() const {
|
|
return getFlags() & ScopeFlags::ContinueScope;
|
|
}
|
|
|
|
/// Determine whether this scope is a C++ 'try' block.
|
|
bool isTryScope() const { return getFlags() & Scope::TryScope; }
|
|
|
|
/// Determine whether this scope is a function-level C++ try or catch scope.
|
|
bool isFnTryCatchScope() const {
|
|
return getFlags() & ScopeFlags::FnTryCatchScope;
|
|
}
|
|
|
|
/// 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;
|
|
}
|
|
|
|
/// Determine whether this scope is a controlling scope in a
|
|
/// if/switch/while/for statement.
|
|
bool isControlScope() const { return getFlags() & Scope::ControlScope; }
|
|
|
|
/// 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 updateNRVOCandidate(VarDecl *VD);
|
|
|
|
void applyNRVO();
|
|
|
|
/// 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
|