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[SR-2854] Compiler crash when mutating collection contained by objc protocol #45448

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swift-ci opened this issue Oct 4, 2016 · 3 comments
Open

[SR-2854] Compiler crash when mutating collection contained by objc protocol #45448

swift-ci opened this issue Oct 4, 2016 · 3 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 SILGen Area → compiler: The SIL generation stage

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@swift-ci
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swift-ci commented Oct 4, 2016

Previous ID SR-2854
Radar None
Original Reporter spf2 (JIRA User)
Type Bug
Environment

swift 3

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

md5: 923c53d696c0ec1f6beaa46768de7064

Issue Description:

Compiler crash is triggered by this code: https://gist.github.com/spf2/ed198c4e80a03cefbb23fe936338bf10

If you get rid of the @objc annotation, the compiler gives: error: MyPlayground.playground:8:13: error: cannot use mutating member on immutable value: 'foo' is a 'let' constant.

By the way, compiler also crashes with this code: https://gist.github.com/spf2/df1e381d00527e45df1b9b94325d4530 even though it compiles fine if you remove the @objc annotation.
@belkadan
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belkadan commented Oct 5, 2016 

Assertion failed: (decl->getMaterializeForSetFunc() && "polymorphic storage without materializeForSet"), function getMaterialized, file /Volumes/Data/swift-public/swift/lib/SILGen/SILGenLValue.cpp, line 852.

@belkadan
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belkadan commented Oct 5, 2016

ObjC protocols aren't going to have materializeForSet decls, so SILGen can't rely on this.

@belkadan
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belkadan commented Oct 5, 2016

cc @jckarter, @slavapestov (when he gets back)

@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 SILGen Area → compiler: The SIL generation stage
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@belkadan @swift-ci @AnthonyLatsis