[LLVMbugs] [Bug 18457] New: add with symbolic immediate hits llvm_unreachable when writing object file

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18457

            Bug ID: 18457
           Summary: add with symbolic immediate hits llvm_unreachable when
                    writing object file
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: ARM
          Assignee: unassignedbugs at nondot.org
          Reporter: joerg at NetBSD.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Try something like

.Lfoo:
   add r0, pc, #.Lfoo - .

This creates a fixup of type 134 (fixup_thumb_adr_pcrel_10).

This is folded correctly by MCExpr::EvaluateSymbolicAdd when called from
MCAssembler::evaluateFixup via line 360. At this point, the fixup has been
patched up, so that both symbols are removed and line 371 is hit. Ultimately,
the code decides that the fixup is still needed, but the object writer later
rejects it as unimplemented.

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