[llvm-bugs] [Bug 30453] New: Assertion failed when using RSP as .cfi_def_cfa_register: (MRI.getLLVMRegNum(Inst.getRegister(), true) == (Is64Bit ? X86::RBP : X86::EBP) && "Invalid frame pointer!")

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30453

            Bug ID: 30453
           Summary: Assertion failed when using RSP as
                    .cfi_def_cfa_register:
                    (MRI.getLLVMRegNum(Inst.getRegister(), true) ==
                    (Is64Bit ? X86::RBP : X86::EBP) && "Invalid frame
                    pointer!")
           Product: clang
           Version: trunk
          Hardware: PC
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: sean.william.g at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Repro:

// %clang -target x86_64-apple-macho -c %s -o /dev/null

_label:
        .cfi_startproc
        .cfi_def_cfa_register rsp
        .cfi_endproc

Outputs:
Assertion failed: (MRI.getLLVMRegNum(Inst.getRegister(), true) == (Is64Bit ?
X86::RBP : X86::EBP) && "Invalid frame pointer!"), function
generateCompactUnwindEncodingImpl, file
/Users/sean/Documents/workspace/clang/llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp,
line 550.
Stack dump:
0.      Program arguments:
/Users/sean/Documents/workspace/clang/build/debug/bin/clang-4.0 -cc1as -triple
x86_64-apple--macho -filetype obj -main-file-name repro.S -target-cpu x86-64
-fdebug-compilation-dir /Users/sean/Documents/workspace/clang/llvm
-dwarf-debug-producer clang version 4.0.0 (trunk 281680) (llvm/trunk 281679)
-dwarf-version=4 -mrelocation-model pic -o /dev/null
/var/folders/b2/t16__58j5437wpqs_fbms4gr0000gn/T/repro-cfe9af.s
clang-4.0: error: unable to execute command: Abort trap: 6
clang-4.0: error: clang integrated assembler command failed due to signal (use
-v to see invocation)
clang version 4.0.0 (trunk 281680) (llvm/trunk 281679)
Target: x86_64-apple--macho
Thread model: posix
InstalledDir: /Users/sean/Documents/workspace/clang/llvm/../build/debug/bin
clang-4.0: note: diagnostic msg: PLEASE submit a bug report to
http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and
associated run script.
clang-4.0: note: diagnostic msg:
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-4.0: note: diagnostic msg:
/var/folders/b2/t16__58j5437wpqs_fbms4gr0000gn/T/repro-d8f001.S
clang-4.0: note: diagnostic msg:
/var/folders/b2/t16__58j5437wpqs_fbms4gr0000gn/T/repro-d8f001.sh
clang-4.0: note: diagnostic msg:

********************

The expected behavior is for clang to raise an error in this case (for the ABI
violation) instead of asserting.

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