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[SR-4553] Recursive generics causes runtime crash #47130

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swift-ci opened this issue Apr 10, 2017 · 0 comments
Closed

[SR-4553] Recursive generics causes runtime crash #47130

swift-ci opened this issue Apr 10, 2017 · 0 comments
Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself runtime The Swift Runtime

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Previous ID SR-4553
Radar None
Original Reporter ylin (JIRA User)
Type Bug
Status Resolved
Resolution Duplicate
Environment

Swift 3.0.2 and 3.1, OSX and Ubuntu 16.04

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

md5: e2897dbe16375302dc368ad8a232af74

duplicates:

  • SR-2549 [CRTP] Non-generic class inheriting from a generic class with Self as generic parameter locks execution

Issue Description:

Here is a short example:

class Super<T> {
}

class Child: Super<Child> {
}

_ = Child()

On OSX, this code will compile, but when executed, it will crash with this stack trace:

ylin@youming-mbpr:~/Desktop$ swift main.swift 
0  swift                    0x0000000107b5dec7 PrintStackTraceSignalHandler(void*) + 39
1  swift                    0x0000000107b5d376 SignalHandler(int) + 646
2  libsystem_platform.dylib 0x00007fffa7414b3a _sigtramp + 26
3  libsystem_platform.dylib 0x000000011442c978 _sigtramp + 1828814424
4  libdispatch.dylib        0x00007fffa71cf8ef dispatch_once_f + 92
5  libdispatch.dylib        0x000000010a0681d8 dispatch_once_f + 1659472197
6  libdispatch.dylib        0x000000010a068424 dispatch_once_f + 1659472785
7  libdispatch.dylib        0x000000010a0683c4 dispatch_once_f + 1659472689
8  libdispatch.dylib        0x00007fffa71cf8fc _dispatch_client_callout + 8
9  libdispatch.dylib        0x00007fffa71cf8b9 dispatch_once_f + 38
10 libdispatch.dylib        0x000000010a0681d8 dispatch_once_f + 1659472197
11 libdispatch.dylib        0x000000010a06801c dispatch_once_f + 1659471753
12 swift                    0x00000001054a5e2f llvm::MCJIT::runFunction(llvm::Function*, llvm::ArrayRef<llvm::GenericValue>) + 655
13 swift                    0x00000001054aba23 llvm::ExecutionEngine::runFunctionAsMain(llvm::Function*, std::__1::vector<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > > > const&, char const* const*) + 707
14 swift                    0x00000001049a8b09 swift::RunImmediately(swift::CompilerInstance&, std::__1::vector<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > > > const&, swift::IRGenOptions&, swift::SILOptions const&) + 3385
15 swift                    0x000000010497eda4 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 50596
16 swift                    0x000000010492c57c main + 9052
17 libdyld.dylib            0x00007fffa7205235 start + 1
18 libdyld.dylib            0x000000000000000a start + 1491054038
Stack dump:
0.  Program arguments: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -frontend -interpret main.swift -enable-objc-interop -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk -color-diagnostics -module-name main 
Illegal instruction: 4

However, on Ubuntu 16.04, this code will compile, but when executed it will hang and the process will not return without CTRL+C.

I don't know if this kind of recursive generics is natively supported by Swift. If yes, then the code should not crash at runtime. If not, then the compiler should've caught this.
@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
This issue was closed.
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself runtime The Swift Runtime
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