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[SR-6714] Runtime crash when passing an array of mutable pointers to a parameter expecting an array of immutable pointers #49263

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hamishknight opened this issue Jan 8, 2018 · 2 comments
Open

[SR-6714] Runtime crash when passing an array of mutable pointers to a parameter expecting an array of immutable pointers #49263

hamishknight opened this issue Jan 8, 2018 · 2 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself crash Bug: A crash, i.e., an abnormal termination of software run-time crash Bug → crash: Swift code crashed during execution type checker Area → compiler: Semantic analysis

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@hamishknight
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Previous ID SR-6714
Radar rdar://problem/36354660
Original Reporter @hamishknight
Type Bug
Environment

Apple Swift version 4.1-dev (LLVM 5d946db43c, Clang 1212e53405, Swift d726bd8)
Target: x86_64-apple-darwin15.6.0

Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, RunTimeCrash, TypeChecker
Assignee None
Priority Medium

md5: 283790d2dde6ebe543f8b4f0a8b2eb46

Issue Description:

The following crashes at runtime:

func foo(_ arr: [UnsafePointer<Int>]) {}

let ptr = UnsafeMutablePointer<Int>.allocate(capacity: 1)
let arr = [ptr]
foo(arr)

with the message "Could not cast value of type 'Swift.UnsafeMutablePointer<Swift.Int>' (0x11338a288) to 'Swift.UnsafePointer<Swift.Int>'".

This is unexpected because there are no force casts in the above code. Either the compiler should reject the passing of an [UnsafeMutablePointer] to a [UnsafePointer] parameter, or the runtime should perform the conversion.
@belkadan
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belkadan commented Jan 8, 2018

@swift-ci create

@tbkka
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tbkka commented Aug 20, 2021

This seems to still be happening with Xcode 12.4, so was unaffected by the dynamic cast overhaul.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@AnthonyLatsis AnthonyLatsis added the crash Bug: A crash, i.e., an abnormal termination of software label Dec 12, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself crash Bug: A crash, i.e., an abnormal termination of software run-time crash Bug → crash: Swift code crashed during execution type checker Area → compiler: Semantic analysis
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@belkadan @hamishknight @AnthonyLatsis @tbkka