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[SR-3770] Swift REPL: Automatically printed description of indirect enum is incorrect and may cause infinite loop #4643

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swift-ci opened this issue Jan 28, 2017 · 4 comments
Closed

[SR-3770] Swift REPL: Automatically printed description of indirect enum is incorrect and may cause infinite loop #4643

swift-ci opened this issue Jan 28, 2017 · 4 comments
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bug Something isn't working LLDB for Swift REPL

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@swift-ci
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Previous ID SR-3770
Radar None
Original Reporter palle (JIRA User)
Type Bug
Status Resolved
Resolution Done
Environment

macOS 10.12.3 (16D32),
Swift 3.0.2 (swiftlang-800.0.63 clang-800.0.42.1),
Xcode 8.2.1 (8C1002)

Additional Detail from JIRA
Votes 0
Component/s LLDB for Swift
Labels Bug, REPL
Assignee jingham@apple.com (JIRA)
Priority Medium

md5: 7c8e8fccab79d40e32bc5bb1aed3238d

is duplicated by:

  • SR-3972 Infinite recursion when defining indirect enums in REPL

Issue Description:

When typing the following code into the Swift REPL (in a Terminal), the Swift REPL goes into an infinite loop trying to print the structural description of a created value:

indirect enum Test {
    case something(Test)
    case end
}
// This line will cause the REPL to go into an infinite loop:
let test = Test.something(Test.something(Test.something(Test.something(Test.end))))

In another case, I have noticed, that some fields in the description may be missing or wrong:

public indirect enum List<Element> {
    case empty
    case element(head: Element, tail: List<Element>)
}
var list = List<Int>.empty
// Everything OK so far
list = List.element(head: 42, tail: list)
// The next line will print an incorrect structural description of the variable list:
list

Some outputs for the last line of the second example are:

$R0: List<Int> = element {
  element = {
    head = 4301270064
    tail = element {
      element = {
        head = -4611677235481463998
        tail = element {
          element = {
            head = 4579621336
            tail = element {
              element = {
                head = 140527134881072
                tail = element {
                  element = {
                    head = 140527134881088
                    tail = element {
                      element = {
                        head = 140527134881088
                        tail = element {
                          element = {
                            head = 4580062912
                            tail = empty
                          }
                        }
                      }
                    }
                  }
                }
              }
            }
          }
        }
      }
    }
  }
}

or

$R1: List<Int> = element {
  element = {
    head = 4301270064
    tail = element {
      element = {
        head = -8070441749301998876
        tail = empty
      }
    }
  }
}
@belkadan
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Reproduces on master. @jckarter, is this a known runtime issue, or an issue with mirrors, or something that really is LLDB's fault?

@jckarter
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I think LLDB does its own handling of these. jingham@apple.com (JIRA User)?

@swift-ci
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Comment by Jim Ingham (JIRA)

This is a data formatter issue, not specific to the REPL. I'm currently investigating this problem.

@swift-ci
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swift-ci commented Feb 7, 2017

Comment by Jim Ingham (JIRA)

Fixed by commit 4e15b79413073623fb0b52702773e5addda85814.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@shahmishal shahmishal transferred this issue from apple/swift May 9, 2022
This issue was closed.
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bug Something isn't working LLDB for Swift REPL
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@jckarter @belkadan @swift-ci