[llvm-bugs] [Bug 46436] Clang crashes when compiling invalid LLVM IR file

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46436

Florian Hahn <florian_hahn at apple.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |WONTFIX
             Status|NEW                         |RESOLVED
                 CC|                            |aprantl at apple.com,
                   |                            |florian_hahn at apple.com
            Summary|Internal clang error while  |Clang crashes when
                   |compiling llvm code         |compiling invalid LLVM IR
                   |                            |file

--- Comment #1 from Florian Hahn <florian_hahn at apple.com> ---
I think this works as expected. The IR is invalid and most LLVM tools use
report_fatal_error to abort on invalid IR. The relevant abort is here:
https://github.com/llvm/llvm-project/blob/07f335128410ca2dbb4b78050132ecd070e2e425/llvm/lib/IR/AutoUpgrade.cpp#L3867

I'll go ahead and mark as wont fix for now. If I am missing something, please
feel free to re-open.


Note that this should only be an issue with invalid IR files provided by a
user. Frontends, the middle-end and back-ends should should never produce
invalid IR.

Running with opt produces:

opt -verify t.ll
Aliasee should be either GlobalValue or ConstantExpr
i32 ()* @g.0
LLVM ERROR: Broken module found, compilation aborted!
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash
backtrace.
Stack dump:
0.      Program arguments: bin/opt -verify t.ll
0  opt                      0x000000010764a6b5
llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 37
1  opt                      0x0000000107649458 llvm::sys::RunSignalHandlers() +
248
2  opt                      0x000000010764aca6 SignalHandler(int) + 262
3  libsystem_platform.dylib 0x00007fff722cc5fd _sigtramp + 29
4  libsystem_platform.dylib 000000000000000000 _sigtramp + 18446603338600626720
5  libsystem_c.dylib        0x00007fff721a2808 abort + 120
6  opt                      0x00000001075a4efb
llvm::report_fatal_error(llvm::Twine const&, bool) + 427
7  opt                      0x00000001075a4d4b llvm::report_fatal_error(char
const*, bool) + 43
8  opt                      0x0000000106ddb1ff
llvm::UpgradeDebugInfo(llvm::Module&) + 207
9  opt                      0x0000000106947f0b
llvm::LLParser::ValidateEndOfModule(bool) + 2523

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