C++ foreign type's dtor needs to be invoked on moved-from objects #77894
Labels
bug
A deviation from expected or documented behavior. Also: expected but undesirable behavior.
c++ interop
Feature: Interoperability with C++
clang importer
Area → compiler: The clang importer
compiler
The Swift compiler itself
ownership
Feature: Ownership modifiers and semantics
swift 6.0
unexpected behavior
Bug: Unexpected behavior or incorrect output
Comments
Xazax-hun
added
bug
Xazax-hun
pushed a commit
that referenced
this issue
Feb 24, 2025
In C++, we always expected to invoke the dtor for moved-from objects. This is not the case for swift. Fortunately, @incxx calling convention is already expressing that the caller supposed to destroy the object. This fixes the missing dtor calls when calling C++ functions taking rvalue references. Fixes #77894. rdar://140786022
Xazax-hun
pushed a commit
that referenced
this issue
Feb 25, 2025
In C++, we always expected to invoke the dtor for moved-from objects. This is not the case for swift. Fortunately, @incxx calling convention is already expressing that the caller supposed to destroy the object. This fixes the missing dtor calls when calling C++ functions taking rvalue references. Fixes #77894. rdar://140786022
Xazax-hun
pushed a commit
that referenced
this issue
Feb 26, 2025
In C++, we always expected to invoke the dtor for moved-from objects. This is not the case for swift. Fortunately, @incxx calling convention is already expressing that the caller supposed to destroy the object. This fixes the missing dtor calls when calling C++ functions taking rvalue references. Fixes #77894. rdar://140786022
Xazax-hun
pushed a commit
that referenced
this issue
Mar 3, 2025
In C++, we always expected to invoke the dtor for moved-from objects. This is not the case for swift. Fortunately, @incxx calling convention is already expressing that the caller supposed to destroy the object. This fixes the missing dtor calls when calling C++ functions taking rvalue references. Fixes #77894. rdar://140786022
AnthonyLatsis
added
compiler
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Description
When passing a type imported from C++ to a consuming Swift function (or a C++ foreign API taking an rvalue reference), the caller is still responsible for destroying the object (calling the dtor) regardless whether the object.
Reproduction
Expected behavior
The dtor for
xis invoked after the last use.Environment
swift-driver version: 1.115 Apple Swift version 6.0.2 (swiftlang-6.0.2.1.2 clang-1600.0.26.4)
Target: arm64-apple-macosx15.0
Additional information
No response
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