[LLVMbugs] [Bug 1618] New: Frame moves information emitter should be refactored/ generalized

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=1618

           Summary: Frame moves information emitter should be
                    refactored/generalized
           Product: libraries
           Version: trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Common Code Generator Code
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: asl at math.spbu.ru
                CC: llvmbugs at cs.uiuc.edu


Unwinding runtime and debugger needs to know some facts about stack frame
layout during the entry of function: position of return address (or, it can be
not on stack, but in some register), caller's stack and frame pointer values,
frame positions for call-clobbered registers, etc. Even more, this information
can be valid not in the entry of funciton, but few instructions later.

Current frame moves information infrastructure is pretty simple and thus code
used it became very messy and hackish (look into X86 target) and even signgle
change in codegen can break the whole stuff.

The requirements of the needed infrastructure should be investigated and code
should be modified. Maybe the can be solved via hooks from prologue/epilogue
emitter plus some target machine information, maybe via machineinst
annotations. 

Good source of ideas can be gcc.


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