[commit: ghc] master: rts linker: Introduce MachOTypes (8ed29b5)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/8ed29b50376856018dfbbcbd6d728c69af0c9f29/ghc

>---------------------------------------------------------------

commit 8ed29b50376856018dfbbcbd6d728c69af0c9f29
Author: Moritz Angermann <moritz.angermann at gmail.com>
Date:   Tue Mar 21 10:59:49 2017 -0400

    rts linker: Introduce MachOTypes
    
    This diff introduces MachOTypes, to reduce the need to typing `struct`
    all the time.  It also coaleces the 64 and non 64 structs. It also adds
    additional fiedls to the object code structure for macho, which makes
    working with macho object code much simpler and requires less passing
    around of variabls or address recomputation for the header, symbol
    table, etc...
    
    Furthermore this diff introduces a type for a linked list of stubs.
    
    I had to move the #ifdef from the bottom of the file up, to be able to
    extend the object code structure conditional on the use of the macho file format.
    
    This is just one of the pieces for the rts linker
    support for ios (aarch64-macho)
    
    ---
    
    The following diagram and legend tries to explain the dependencies a
    bit:
    ```
      .- D3240
      v
    D3255 <- D3252 <- D3251 <- This
      ^
      '- D3238
    ```
    
    - In D3238 we started allowing preloading object code with mmap
      in iOS, where we can't have r+w+x.
    - In D3239 we introduced a richer extension of the object code
      data type to make working with mach-o files easier.
    - In D3240 we set the stage to allow loading archives (.a) on iOS
    - In D3251 we added init and deinit functions to populate and
      depopulate the enriched object code data structure for mach-o
      files.
    - In D3252 we refactored most of the MachO.c file to use the
      new types and data structure.
    - in D3255 we finally introduce the aarch64-mach-o linker.
    
    Reviewers: austin, erikd, simonmar, rwbarton, bgamari
    
    Subscribers: rwbarton, thomie, ryantrinkle
    
    Differential Revision: https://phabricator.haskell.org/D3239


>---------------------------------------------------------------

8ed29b50376856018dfbbcbd6d728c69af0c9f29
 rts/Linker.c            |   6 +++
 rts/LinkerInternals.h   |  28 +++++++++-
 rts/linker/MachOTypes.h | 133 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 165 insertions(+), 2 deletions(-)

Diff suppressed because of size. To see it, use:

    git diff-tree --root --patch-with-stat --no-color --find-copies-harder --ignore-space-at-eol --cc 8ed29b50376856018dfbbcbd6d728c69af0c9f29