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[SR-2764] LLDB fails to to import a Clang module imported into Swift #4586

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swift-ci opened this issue Sep 26, 2016 · 5 comments
Closed

[SR-2764] LLDB fails to to import a Clang module imported into Swift #4586

swift-ci opened this issue Sep 26, 2016 · 5 comments
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bug Something isn't working LLDB for Swift

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Previous ID SR-2764
Radar None
Original Reporter dmishe (JIRA User)
Type Bug
Status Closed
Resolution Done

Attachment: Download

Environment

Apple Swift version 3.0 (swiftlang-800.0.46.2 clang-800.0.38)
Target: x86_64-apple-macosx10.9

Additional Detail from JIRA
Votes 1
Component/s LLDB for Swift
Labels Bug
Assignee None
Priority Medium

md5: 4e80e0f98f6325462d3732d4035ae6d8

relates to:

  • SR-3169 lldb stops working when C module includes a header outside of module's include/ dir

Issue Description:

When a Clang module (CModule) is imported into Swift code (module Foo), that is then used by C code. LLDB is able to find Foo in dSYM, but fails to import the CModule module.

If you run build.sh in the attached sample, you will see:

warning: Swift error in module main.
Debug info from this module will be unavailable in the debugger.

error: in auto-import:
failed to get module 'Foo' from AST context:
error: missing required module 'CModule'

The program itself runs just fine:

$ out/main
2016-09-26 18:36:45.065 main[87591:4787892] Hello, World!
2016-09-26 18:36:45.066 main[87591:4787892] Foo = <CModule: 0x7fdbfa6002c0>

Clearly I am not telling the compiler enough for it to be able to reconstruct the context afterwards. But I am not sure what is missing.
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Comment by Dmitry Shevchenko (JIRA)

@trfiala, this might be related to https://bugs.swift.org/browse/SR-2637

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Mannequin

trfiala mannequin commented Sep 29, 2016

dmishe (JIRA User), hmm not sure. Have you tried this with a macOS package that includes the fix that went in SR-2637? Do you get the same behavior? The swift-lldb master branch is now quite a bit ahead of the swift 3.0 release's corresponding LLDB, and includes the SR-2637 change, so there is certainly potential for lookups to be handled differently given all the changes that came in from LLVM.org LLDB.

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Comment by Dmitry Shevchenko (JIRA)

Reproduces on swift-DEVELOPMENT-SNAPSHOT-2016-09-27-a.xctoolchain. I suppose it's not that related.

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Comment by Dmitry Shevchenko (JIRA)

@trfiala what is the canonical way for LLDB to discover and load Clang modules? I would like to debug this issue some more and some pointers would be really helpful.

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swift-ci commented Jan 5, 2017

Comment by Dmitry Shevchenko (JIRA)

After some poking at this, it looks like I was missing debug info in .swiftmodule, adding

 -Xfrontend -serialize-debugging-options

Fixes the issue.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@shahmishal shahmishal transferred this issue from apple/swift May 7, 2022
This issue was closed.
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