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Make non-natural alignment a validation error in spec interpreter / test #242

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Make non-natural alignment a validation error in spec interpreter / test #242

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9dce77b
Add tests for alignment hint less than natural alignment
stevenfontanella Jan 29, 2026
36eb53a
Make non-natural alignment on atomic memroy operations a validation e…
stevenfontanella Feb 3, 2026
88fc199
PR updates
stevenfontanella Feb 4, 2026
ba21344
Update interpreter/valid/valid.ml
rossberg Feb 6, 2026
052c6c1
Update atomic.wast
rossberg Feb 6, 2026
90a44b9
Try setup-ocaml@v3
stevenfontanella Feb 6, 2026
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2 changes: 1 addition & 1 deletion .github/workflows/ci-interpreter.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,7 @@ jobs:
- name: Checkout repo
uses: actions/checkout@v2
- name: Setup OCaml
uses: ocaml/setup-ocaml@v2
uses: ocaml/setup-ocaml@v3
with:
ocaml-compiler: 4.12.x
- name: Setup OCaml tools
Expand Down
37 changes: 22 additions & 15 deletions interpreter/valid/valid.ml
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Expand Up @@ -189,7 +189,9 @@ let check_vec_binop binop at =
error at "invalid lane index"
| _ -> ()

let check_memop (c : context) (memop : ('t, 's) memop) ty_size get_sz at =
type mem_mode = NonAtomic | Atomic

let check_memop (mode : mem_mode) (c : context) (memop : ('t, 's) memop) ty_size get_sz at =
let _mt = memory c (0l @@ at) in
let size =
match get_sz memop.pack with
Expand All @@ -198,8 +200,13 @@ let check_memop (c : context) (memop : ('t, 's) memop) ty_size get_sz at =
check_pack sz (ty_size memop.ty) at;
packed_size sz
in
require (1 lsl memop.align <= size) at
"alignment must not be larger than natural"
match mode with
| NonAtomic ->
require (1 lsl memop.align <= size) at
"alignment must not be larger than natural";
| Atomic ->
require (1 lsl memop.align = size) at
"atomic alignment must be natural"


(*
Expand Down Expand Up @@ -354,29 +361,29 @@ let rec check_instr (c : context) (e : instr) (s : infer_result_type) : op_type
[] --> []

| Load memop ->
check_memop c memop num_size (Lib.Option.map fst) e.at;
check_memop NonAtomic c memop num_size (Lib.Option.map fst) e.at;
[NumType I32Type] --> [NumType memop.ty]

| Store memop ->
check_memop c memop num_size (fun sz -> sz) e.at;
check_memop NonAtomic c memop num_size (fun sz -> sz) e.at;
[NumType I32Type; NumType memop.ty] --> []

| VecLoad memop ->
check_memop c memop vec_size (Lib.Option.map fst) e.at;
check_memop NonAtomic c memop vec_size (Lib.Option.map fst) e.at;
[NumType I32Type] --> [VecType memop.ty]

| VecStore memop ->
check_memop c memop vec_size (fun _ -> None) e.at;
check_memop NonAtomic c memop vec_size (fun _ -> None) e.at;
[NumType I32Type; VecType memop.ty] --> []

| VecLoadLane (memop, i) ->
check_memop c memop vec_size (fun sz -> Some sz) e.at;
check_memop NonAtomic c memop vec_size (fun sz -> Some sz) e.at;
require (i < vec_size memop.ty / packed_size memop.pack) e.at
"invalid lane index";
[NumType I32Type; VecType memop.ty] --> [VecType memop.ty]

| VecStoreLane (memop, i) ->
check_memop c memop vec_size (fun sz -> Some sz) e.at;
check_memop NonAtomic c memop vec_size (fun sz -> Some sz) e.at;
require (i < vec_size memop.ty / packed_size memop.pack) e.at
"invalid lane index";
[NumType I32Type; VecType memop.ty] --> []
Expand Down Expand Up @@ -514,23 +521,23 @@ let rec check_instr (c : context) (e : instr) (s : infer_result_type) : op_type
"invalid lane index";
[t; NumType t2] --> [t]
| MemoryAtomicWait atomicop ->
check_memop c atomicop num_size (fun sz -> sz) e.at;
check_memop Atomic c atomicop num_size (fun sz -> sz) e.at;
[NumType I32Type; NumType atomicop.ty; NumType I64Type] --> [NumType I32Type]
| MemoryAtomicNotify atomicop ->
check_memop c atomicop num_size (fun sz -> sz) e.at;
check_memop Atomic c atomicop num_size (fun sz -> sz) e.at;
[NumType I32Type; NumType I32Type] --> [NumType I32Type]
| AtomicFence -> [] --> []
| AtomicLoad atomicop ->
check_memop c atomicop num_size (fun sz -> sz) e.at;
check_memop Atomic c atomicop num_size (fun sz -> sz) e.at;
[NumType I32Type] --> [NumType atomicop.ty]
| AtomicStore atomicop ->
check_memop c atomicop num_size (fun sz -> sz) e.at;
check_memop Atomic c atomicop num_size (fun sz -> sz) e.at;
[NumType I32Type; NumType atomicop.ty] --> []
| AtomicRmw (rmwop, atomicop) ->
check_memop c atomicop num_size (fun sz -> sz) e.at;
check_memop Atomic c atomicop num_size (fun sz -> sz) e.at;
[NumType I32Type; NumType atomicop.ty] --> [NumType atomicop.ty]
| AtomicRmwCmpXchg atomicop ->
check_memop c atomicop num_size (fun sz -> sz) e.at;
check_memop Atomic c atomicop num_size (fun sz -> sz) e.at;
[NumType I32Type; NumType atomicop.ty; NumType atomicop.ty] --> [NumType atomicop.ty]

and check_seq (c : context) (s : infer_result_type) (es : instr list)
Expand Down
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