[RTS] Add getObjectLoadStatus

This adds a function to the RTS linker API which lets the
user check the status of dynamically linked objects.

It was initially proposed by @afarmer in D2068.
It's useful for testing the linker and also for detecting retention
problems in production.

It takes a path, because it's easier to use path as key instead of producing
some stable handle.

It returns an enum instead of bool, because I see no reason for destroying
information. All the complexity is already out in the open, so there's
nothing to save the users from.

Test Plan: ./validate

Reviewers: simonmar, Phyx, bgamari, austin, erikd

Reviewed By: Phyx, bgamari

Subscribers: rwbarton, afarmer, thomie

Differential Revision: https://phabricator.haskell.org/D3963

1 files changed, 0 insertions, 9 deletions

diff --git a/rts/LinkerInternals.h b/rts/LinkerInternals.h
index 2e8491789d..dd17be0992 100644
--- a/rts/LinkerInternals.h
+++ b/rts/LinkerInternals.h
@@ -20,15 +20,6 @@
 typedef void SymbolAddr;
 typedef char SymbolName;
 
-/* See Linker.c Note [runtime-linker-phases] */
-typedef enum {
-    OBJECT_LOADED,
-    OBJECT_NEEDED,
-    OBJECT_RESOLVED,
-    OBJECT_UNLOADED,
-    OBJECT_DONT_RESOLVE
-} OStatus;
-
 /* Indication of section kinds for loaded objects.  Needed by
    the GC for deciding whether or not a pointer on the stack
    is a code pointer.