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  1. 20 Aug, 2017 1 commit
    • Adam Nelson's avatar
      Atomic memory cells and operations for WMM/RISC-V · 59737ac5
      Adam Nelson authored
      - Memory and registers are split up into typed atomic cells
      - Value type now contains only scalar values
      - Instructions are compiled down to WMM "operations", allowing stores
        and loads of composite values to be split up into atomic parts
      - Scheduler now executes one operation at a time, rather than one block
        at a time
      - New scheduler steps for WMM
      - Commands (formerly Thread Actions) such as allocation now executed at
        the global scheduler level. Action IDs no longer needed.
      - Threads and stacks changed completely; registers now stored in stack
      - Monads pretty-print properly again!
      - Patricia trees replaced with sptrees
      Lots of code is still commented out, and tests still don't work, but
      the main formalization code compiles.
  2. 20 Jul, 2017 1 commit
  3. 25 Jun, 2017 1 commit
    • Adam Nelson's avatar
      More progress on RISC-V, change pop-frame process · b1d3c66c
      Adam Nelson authored
      - Free was changed from a store message to a thread_action message
      - Stack frames are now freed properly when returning from a function
      - Heap/stack addresses are tracked separately again
      - New stores are added to invalidation buffers, per the spec
      - Thread actions are executed now
      - Tests still don't work yet
  4. 22 Jun, 2017 1 commit
  5. 06 Jun, 2017 1 commit
  6. 05 May, 2017 1 commit
    • Adam Nelson's avatar
      Prove local seq consistency for seq_cst_schedule · fb68640a
      Adam Nelson authored
      It's finally done! The first memory consistency proof in the formalization:
      a sequentially consistent schedule (one that always commits memory messages
      from the front of a thread's outbox queue) will always produce locally
      sequentially consistent semantics.
      Changes made in the process of this proof include:
      - Removed thread IDs and stack IDs from the thread and stack records;
        keeping up with invariants for them was pointless bookkeeping
      - Defined custom tactics multi_case_tac and rw_assums, which greatly
        reduced the size and complexity of some proofs
      - Added several new invariants to state_ok, including memory consistency
        invariants (committed messages are all distinct, no message can be in
        both the commit list and a thread's outbox, etc.)
  7. 03 Apr, 2017 1 commit
  8. 02 Apr, 2017 1 commit
  9. 31 Mar, 2017 1 commit
  10. 28 Mar, 2017 1 commit
  11. 26 Mar, 2017 1 commit
  12. 02 Mar, 2017 1 commit
    • Adam Nelson's avatar
      Split up uvmThreadSemantics, add 'ok' predicates · ff7ff016
      Adam Nelson authored
      uvmThreadSemantics was becoming a huge file that took several minutes
      to compile, so it's been split into uvmThreadsStacks and
      In uvmThreadsStacks, new 'thread_ok' and 'stack_ok' predicates define
      basic consistency requirements for thread and stack data structures.
      All functions in this file have also been proven to produce valid
      thread/stack structures when given valid input. This is a prerequisite
      for proving execution state homomorphisms.
      'thread_state' has been renamed to 'thread', and 'state_follows' has
      been renamed to 'thread_follows'.