[LLVMbugs] [Bug 1650] New: Should provide target-specific hooks for selecting preferred EH data emission format

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=1650

           Summary: Should provide target-specific hooks for selecting
                    preferred EH data emission format
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Common Code Generator Code
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: asl at math.spbu.ru
                CC: isanbard at gmail.com, baldrick at free.fr,
                    llvmbugs at cs.uiuc.edu


We really need to have mechanism to allow target:

1. Select data format used for emission of eh/debug data
2. Override data emission procedure.

See, for example, GCC's ASM_PREFERRED_EH_DATA_FORMAT macro and corresponding
handling in dwarf2asm.c

This will be especially needed for carefully handling of EHs on many platforms
without introducing extra code complexity & bunch of knobs.


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