[llvm-bugs] [Bug 43162] New: Add ability to print segment size information

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https://bugs.llvm.org/show_bug.cgi?id=43162

            Bug ID: 43162
           Summary: Add ability to print segment size information
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: llvm-size
          Assignee: unassignedbugs at nondot.org
          Reporter: jh7370.2008 at my.bristol.ac.uk
                CC: bigcheesegs at gmail.com, llvm-bugs at lists.llvm.org

llvm-size, like GNU size, uses the section headers to determine the sizes it
will print. However, this doesn't really reflect what the memory usage of a
program might be, because, for example, it doesn't take account of
between-section padding, stripped sections (e.g. via llvm-objcopy
--strip-sections) and so on. It might be nice if we added a new switch
(possibly a new --format option) to print the sizes as a loader might see,
namely the size of all loadable segments, probably broken down by segment. It
may or may not make sense to print the sizes of other (non-loadable) segments.
I'm open to ideas for formatting etc. It probably makes sense to look similar
to sysv output, listing each segment, in order, with type, flags, file size,
and memory size listed. Possibly a Total line would only include the real size
(i.e. nested segment sizes wouldn't be included).

Example:

Index Type      Flags FileSize MemSize
    1 LOAD      RX          10      10
    2 LOAD      RW           8      20
    3 TLS       RW           4      10
    4 GNU_RELRO RW           4       4
    4 NOTE      R           20       0
Total                       38      3c

(I've assumed special-handling of PT_TLS in the above example, since it looks
to be nested, but takes up additional memory not included in the parent
segment).

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