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Clang does not generate DW_TAG_label #35768

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JDevlieghere opened this issue Feb 17, 2018 · 6 comments
Open

Clang does not generate DW_TAG_label #35768

JDevlieghere opened this issue Feb 17, 2018 · 6 comments
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bugzilla Issues migrated from bugzilla debuginfo

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@JDevlieghere
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Bugzilla Link 36420
Version trunk
OS All
Attachments llvm-dwarfdump output for clang binary, llvm-dwarfdump output for gcc binary
CC @adrian-prantl,@JDevlieghere

Extended Description

clang does not generate a DW_TAG_label for the example below, while gcc does:

int main(int argc, char** argv)
{
goto failure;
failure:
return 1;
}
@JDevlieghere
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I tried bisecting this but couldn't find any passing builds. Did we ever generate this TAG?

@adrian-prantl
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I have only ever seen DW_TAG_label being generated for assembler sources. In assembler there is no notion of a function, only labels.

@adrian-prantl
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Do you think generating a DW_TAG_label for C-language labels would be useful?

@JDevlieghere
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I'd like to say yes, assuming that it's a prerequisite to be able to break on labels in the debugger. I don't know if LLDB supports this, but I'm pretty sure GDB does.

@adrian-prantl
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Is it possible to distinguish user-specified labels from compiler-generated ones in LLVM IR and MIR? If yes, then this should be fairly straightforward to implement in AsmPrinter.

@llvmbot llvmbot transferred this issue from llvm/llvm-bugzilla-archive Dec 10, 2021
@llvmbot
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llvmbot commented Oct 8, 2023

@llvm/issue-subscribers-debuginfo

| | | | --- | --- | | Bugzilla Link | [36420](https://llvm.org/bz36420) | | Version | trunk | | OS | All | | Attachments | [llvm-dwarfdump output for clang binary](https://user-images.githubusercontent.com/712896/143757064-9522842f-deb4-4d9c-b96d-fe39eebf7d47.gz), [llvm-dwarfdump output for gcc binary](https://user-images.githubusercontent.com/712896/143757065-c75ab33c-5cd9-44d7-8a94-306f4c84bb49.gz) | | CC | @adrian-prantl,@JDevlieghere |

Extended Description

clang does not generate a DW_TAG_label for the example below, while gcc does:

int main(int argc, char** argv)
{
goto failure;
failure:
return 1;
}

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@JDevlieghere @adrian-prantl @Endilll @llvmbot