[LLVMbugs] [Bug 1380] NEW: EH frames must be emitted in one "atom".

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=1380

           Summary: EH frames must be emitted in one "atom".
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Common Code Generator Code
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: asl at math.spbu.ru


Currently there are two ways of registering eh function frames during runtime:

1. __register_frame_info call (and friends) in the early beginning (crtbegin.o).
2. Direct eh section inspection ("GLIBC" method).

Unfortunately, it seems the __register_frame_info call not always emitted (e.g.
crtbegin.o compiled during llvm-gcc compilation without LLVM itself lacks this
call). 

The second approach uses some assumptions. One of the biggest assumption is that
entries in eh frame section are sorted according to PC's stored in entries. We
can easily achieve this, if we emit information at once in the end (like gcc
does). When we're emitting this information in separate "parts" (but in one
section, of course), linker can permute "parts" making sort assumption invalid.

This is needed for backward compatibility of generated eh information.



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