[Bug general/3721] New: Add ISA <-> Elf map, eliminate switch

["cagney at redhat dot com" <sourceware-bugzilla@sourceware.org>]

The file IsaFactory contains:

        ElfEHeader header = elfFile.getEHeader();
        switch (header.machine)
          {
          case ElfEMachine.EM_386:
            {
              if (frysk.core.Build.BUILD_ARCH.equals("i686"))
                return LinuxIa32.isaSingleton ();
              else
                return LinuxIa32On64.isaSingleton();
            }
          case ElfEMachine.EM_PPC:
            {
              // Assume we do not build 32-bit frysk on ppc64.
              if (frysk.core.Build.BUILD_ARCH.equals("powerpc64"))
                return LinuxPPC32On64.isaSingleton ();
              else
                return LinuxPPC.isaSingleton ();
            }
          case ElfEMachine.EM_PPC64:
            return LinuxPPC64.isaSingleton ();
          case ElfEMachine.EM_X86_64:
            return LinuxX8664.isaSingleton ();
          default:
            throw new TaskException("Unknown machine type " + header.machine);
          }

instead the IsaFactory (called ElfIsa????) should contain a hash table mapping
Elf.MACHINE/Elf.ENDIAN/Elf.WORDSIZE <-> a corresponding ISA object and then use
that.

That way, given an ISA, the corresponding Elf info can be found - see fcore; and
given the Elf info the corresponding ISA can be found - see the existing code.

-- 
           Summary: Add ISA <-> Elf map, eliminate switch
           Product: frysk
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: general
        AssignedTo: frysk-bugzilla at sourceware dot org
        ReportedBy: cagney at redhat dot com
                CC: pmuldoon at redhat dot com
OtherBugsDependingO 2234,3387
             nThis:


http://sourceware.org/bugzilla/show_bug.cgi?id=3721

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