Stream: git-wasmtime

Topic: wasmtime / PR #3781 ISLE: Common accessors for some insn ...

Wasmtime GitHub notifications bot (Feb 08 2022 at 22:52):

uweigand opened PR #3781 from isle-insndata to main:

Add accessors to prelude.isle to access data fields of
func_addr and symbol_value instructions.

These are based on similar versions I had added to the s390x
back-end, but are a bit more straightforward to use.

• func_ref_data: Extract SigRef, ExternalName, and RelocDistance
  fields given a FuncRef.

• symbol_value_data: Extract ExternalName, RelocDistance, and
  offset fields given a GlobalValue representing a Symbol.

• reloc_distance_near: Test for RelocDistance::Near.

The s390x back-end is changed to use these common versions.

Note that this exposed a bug in common isle code: This extractor:

(extractor (load_sym inst)
  (and inst
       (load _ (def_inst (symbol_value
                           (symbol_value_data _
                             (reloc_distance_near) offset)))
               (i64_from_offset
                 (memarg_symbol_offset_sum <offset _)))))

would raise an assertion in sema.rs due to a supposed cycle in
extractor definitions. But there was no actual cycle, it was
simply that the extractor tree refers twice to the insn_data
extractor (once via the load and once via the symbol_value
extractor). Fixed by checking for pre-existing definitions only
along one path in the tree, not across the whole tree.

CC @cfallin

<!--

Please ensure that the following steps are all taken care of before submitting
the PR.

• [ ] This has been discussed in issue #..., or if not, please tell us why
  here.

• [ ] A short description of what this does, why it is needed; if the
  description becomes long, the matter should probably be discussed in an issue
  first.

• [ ] This PR contains test cases, if meaningful.

• [ ] A reviewer from the core maintainer team has been assigned for this PR.
  If you don't know who could review this, please indicate so. The list of
  suggested reviewers on the right can help you.

Please ensure all communication adheres to the code of conduct.
-->

Wasmtime GitHub notifications bot (Feb 09 2022 at 01:57):

cfallin submitted PR review.

Wasmtime GitHub notifications bot (Feb 09 2022 at 01:57):

cfallin merged PR #3781.

Last updated: Oct 23 2024 at 20:03 UTC