1374aa35a3
When a vector is instantiated with a pointer type (`T` being `const Foo*`), the inferred annotation becomes `push_back(const Foo*& value [[clang::lifetime_capture_by(this)]])`. For reference parameters, the `lifetime_capture_by` attribute treats the lifetime as referring to the referenced object -- in this case, the **pointer** itself, not the pointee object. In the `push_back`, we copy the pointer's value, which does not establish a reference to the pointer. This behavior is safe and does not capture the pointer's lifetime. The annotation should not be inferred for cases where `T` is a pointer type, as the intended semantics do not align with the annotation. Fixes #121391
68 lines
2.5 KiB
C++
68 lines
2.5 KiB
C++
//===- CheckExprLifetime.h ----------------------------------- -*- 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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// This files implements a statement-local lifetime analysis.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_SEMA_CHECK_EXPR_LIFETIME_H
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#define LLVM_CLANG_SEMA_CHECK_EXPR_LIFETIME_H
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#include "clang/AST/Expr.h"
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#include "clang/Sema/Initialization.h"
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#include "clang/Sema/Sema.h"
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namespace clang::sema {
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// Tells whether the type is annotated with [[gsl::Pointer]].
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bool isGLSPointerType(QualType QT);
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/// Describes an entity that is being assigned.
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struct AssignedEntity {
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// The left-hand side expression of the assignment.
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Expr *LHS = nullptr;
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CXXMethodDecl *AssignmentOperator = nullptr;
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};
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struct CapturingEntity {
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// In an function call involving a lifetime capture, this would be the
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// argument capturing the lifetime of another argument.
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// void addToSet(std::string_view sv [[clang::lifetime_capture_by(setsv)]],
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// set<std::string_view>& setsv);
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// set<std::string_view> setsv;
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// addToSet(std::string(), setsv); // Here 'setsv' is the 'Entity'.
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//
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// This is 'nullptr' when the capturing entity is 'global' or 'unknown'.
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Expr *Entity = nullptr;
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};
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/// Check that the lifetime of the given expr (and its subobjects) is
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/// sufficient for initializing the entity, and perform lifetime extension
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/// (when permitted) if not.
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void checkInitLifetime(Sema &SemaRef, const InitializedEntity &Entity,
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Expr *Init);
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/// Check that the lifetime of the given expr (and its subobjects) is
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/// sufficient for assigning to the entity.
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void checkAssignmentLifetime(Sema &SemaRef, const AssignedEntity &Entity,
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Expr *Init);
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void checkCaptureByLifetime(Sema &SemaRef, const CapturingEntity &Entity,
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Expr *Init);
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/// Check that the lifetime of the given expr (and its subobjects) is
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/// sufficient, assuming that it is passed as an argument to a musttail
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/// function.
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void checkExprLifetimeMustTailArg(Sema &SemaRef,
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const InitializedEntity &Entity, Expr *Init);
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bool implicitObjectParamIsLifetimeBound(const FunctionDecl *FD);
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} // namespace clang::sema
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#endif // LLVM_CLANG_SEMA_CHECK_EXPR_LIFETIME_H
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