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[SR-15223] Swift/LLVM Crash #57545

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swift-ci opened this issue Sep 21, 2021 · 5 comments
Closed

[SR-15223] Swift/LLVM Crash #57545

swift-ci opened this issue Sep 21, 2021 · 5 comments
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@beccadax
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself

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Previous ID SR-15223
Radar rdar://problem/83411927
Original Reporter ed4online (JIRA User)
Type Bug
Status Resolved
Resolution Duplicate
Environment 
$ swift --version swift-driver version: 1.26.9 Apple Swift version 5.5 (swiftlang-1300.0.31.1 clang-1300.0.29.1) Target: x86_64-apple-macosx11.0
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug
Assignee @beccadax
Priority Medium

md5: 46197bfe3129c8df0bf7d51cdfa541ce

Issue Description:

//
$ swift
Welcome to Swift version 5.5-dev.
Type :help for assistance.
  1> class Foo {}
  2> class Test { 
      func makeFoo (_ bool: Bool) -> Foo? { return bool ? Foo() : nil }
      func process (bools: [Bool]) -> [Foo]? { 
        // the `as? [Foo]` was meant to produce `nil` from [nil, Foo()]
        return bools.map { makeFoo(bool:$0) } as? [Foo]
      } 
    } 
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace.
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
0  lldb                     0x0000000109ce80b7 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 39
1  lldb                     0x0000000109ce7775 llvm::sys::RunSignalHandlers() + 85
2  lldb                     0x0000000109ce8966 SignalHandler(int) + 278
3  libsystem_platform.dylib 0x00007fff204d4d7d _sigtramp + 29
4  libsystem_platform.dylib 0x00007ff67b3033d8 _sigtramp + 18446744036579665528
5  LLDB                     0x000000010cd41bcc swift::ASTVisitor<(anonymous namespace)::StmtEmitter, void, void, void, void, void, void>::visit(swift::Stmt*) + 3772
6  LLDB                     0x000000010cd46b4a (anonymous namespace)::StmtEmitter::visitBraceStmt(swift::BraceStmt*) + 250
7  LLDB                     0x000000010cd40d05 swift::Lowering::SILGenFunction::emitStmt(swift::Stmt*) + 21
8  LLDB                     0x000000010cd06779 swift::Lowering::SILGenFunction::emitFunction(swift::FuncDecl*) + 409
9  LLDB                     0x000000010cca3576 swift::Lowering::SILGenModule::emitFunctionDefinition(swift::SILDeclRef, swift::SILFunction*) + 6966
10 LLDB                     0x000000010cca4ab0 emitOrDelayFunction(swift::Lowering::SILGenModule&, swift::SILDeclRef, bool) + 352
11 LLDB                     0x000000010cca1a2b swift::Lowering::SILGenModule::emitFunction(swift::FuncDecl*) + 107
12 LLDB                     0x000000010cd4fb83 swift::ASTVisitor<(anonymous namespace)::SILGenType, void, void, void, void, void, void>::visit(swift::Decl*) + 115
13 LLDB                     0x000000010cd4d7ac (anonymous namespace)::SILGenType::emitType() + 108
14 LLDB                     0x000000010cd4d739 swift::Lowering::SILGenModule::visitNominalTypeDecl(swift::NominalTypeDecl*) + 25
15 LLDB                     0x000000010cca6bc9 swift::ASTLoweringRequest::evaluate(swift::Evaluator&, swift::ASTLoweringDescriptor) const + 1913
16 LLDB                     0x000000010cd408d5 swift::SimpleRequest<swift::ASTLoweringRequest, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule> > (swift::ASTLoweringDescriptor), (swift::RequestFlags)9>::evaluateRequest(swift::ASTLoweringRequest const&, swift::Evaluator&) + 197
17 LLDB                     0x000000010cabfee7 llvm::Expected<swift::ASTLoweringRequest::OutputType> swift::Evaluator::getResultUncached<swift::ASTLoweringRequest>(swift::ASTLoweringRequest const&) + 231
18 LLDB                     0x000000010cca7af7 swift::performASTLowering(swift::FileUnit&, swift::Lowering::TypeConverter&, swift::SILOptions const&) + 103
19 LLDB                     0x000000010c1162a2 lldb_private::SwiftExpressionParser::Parse(lldb_private::DiagnosticManager&, unsigned int, unsigned int) + 5202
20 LLDB                     0x000000010c125f8d lldb_private::SwiftUserExpression::Parse(lldb_private::DiagnosticManager&, lldb_private::ExecutionContext&, lldb_private::ExecutionPolicy, bool, bool) + 1821
21 LLDB                     0x000000010bf50504 lldb_private::UserExpression::Evaluate(lldb_private::ExecutionContext&, lldb_private::EvaluateExpressionOptions const&, llvm::StringRef, llvm::StringRef, std::__1::shared_ptr<lldb_private::ValueObject>&, lldb_private::Status&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*, lldb_private::ValueObject*) + 2260
22 LLDB                     0x000000010bf4e291 lldb_private::REPL::IOHandlerInputComplete(lldb_private::IOHandler&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >&) + 2721
23 LLDB                     0x000000010bebfcd2 lldb_private::IOHandlerEditline::Run() + 322
24 LLDB                     0x000000010bea5e0f lldb_private::Debugger::RunIOHandlers() + 143
25 LLDB                     0x000000010bea8a43 lldb_private::Debugger::IOHandlerThread(void*) + 19
26 LLDB                     0x000000010bf59177 lldb_private::HostNativeThreadBase::ThreadCreateTrampoline(void*) + 103
27 libsystem_pthread.dylib  0x00007fff2048f8fc _pthread_start + 224
28 libsystem_pthread.dylib  0x00007fff2048b443 thread_start + 15
Segmentation fault: 11
@swift-ci
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Comment by Ed (JIRA)

The use of `as? [Foo]` or `as! [Foo]` produces the crash. Using `as` or leaving out the clause altogether produces a compiler error (as expected based on the type mismatch).

@typesanitizer
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Comment by Ed (JIRA)

$ swift 
Welcome to Swift version 5.5-dev. 
Type :help for assistance.   
1> class Foo {}
2> let foos: [Foo?] = [nil, Foo(), Foo()]  
foos: [Foo?] = 3 values {   
[0] = nil   
[1] = 0x0000000100504300   
[2] = 0x0000000100504a80 
}   
3> let foosCompacted: [Foo]? = foos as? [Foo]  
foosCompacted: [Foo]? = nil

This is as expected.

@beccadax
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beccadax commented Oct 1, 2021

With the compiler I've been working on locally (built recently from main), I get:

<stdin>:6:35: error: extraneous argument label 'bool:' in call
        return bools.map { makeFoo(bool:$0) } as? [Foo]
                                  ^~~~~~

ed4online (JIRA User), can you download the latest "Trunk Development (main)" snapshot from https://swift.org/download/ and see if the bug is fixed for you?

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swift-ci commented Oct 2, 2021

Comment by Ed (JIRA)

And if you fix the syntax error? [To ensure that my cut-and-paste error when creating this Issue isn't masking the `as?` issue]

On 5.5-dev it is the combination of the syntax error AND `as?` causing the crash. Fix the syntax error or replace `as?` with `as` and the crash goes away.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself
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