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[threads] Fix shared ref.eq and disallow mixed-shareability
Update the validator to reject mixed-shareability ref.eq, although this is still under discussion in WebAssembly/shared-everything-threads#76. Fix the implementation of `Literal::operator==` to work properly with shared i31ref.
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5 files changed

+211
-3
lines changed

5 files changed

+211
-3
lines changed

‎scripts/fuzz_opt.py‎

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -360,6 +360,7 @@ def is_git_repo():
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'shared-null.wast',
361361
'shared-absheaptype.wast',
362362
'type-ssa-shared.wast',
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'shared-ref_eq.wast',
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]
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‎src/wasm/literal.cpp‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -445,7 +445,8 @@ bool Literal::operator==(const Literal& other) const {
445445
if (type.isData()) {
446446
return gcData == other.gcData;
447447
}
448-
if (type.getHeapType() == HeapType::i31) {
448+
assert(type.getHeapType().isBasic());
449+
if (type.getHeapType().getBasic(Unshared) == HeapType::i31) {
449450
return i32 == other.i32;
450451
}
451452
WASM_UNREACHABLE("unexpected type");

‎src/wasm/wasm-validator.cpp‎

Lines changed: 6 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -2306,6 +2306,12 @@ void FunctionValidator::visitRefEq(RefEq* curr) {
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eqref,
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curr->right,
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"ref.eq's right argument should be a subtype of eqref");
2309+
if (curr->left->type.isRef() && curr->right->type.isRef()) {
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shouldBeEqual(curr->left->type.getHeapType().getShared(),
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curr->right->type.getHeapType().getShared(),
2312+
curr,
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"ref.eq operands must have the same shareability");
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}
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}
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23112317
void FunctionValidator::visitTableGet(TableGet* curr) {

‎test/spec/shared-polymorphism.wast‎

Lines changed: 0 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -2,8 +2,6 @@
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;; references.
33
(module
44
(func (drop (ref.eq (ref.null (shared none)) (ref.null (shared none)))))
5-
(func (drop (ref.eq (ref.null (shared none)) (ref.null none))))
6-
(func (drop (ref.eq (ref.null none) (ref.null (shared none)))))
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86
(func (param (ref null (shared i31))) (drop (i31.get_s (local.get 0))))
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(func (param (ref null (shared i31))) (drop (i31.get_u (local.get 0))))

‎test/spec/shared-ref_eq.wast‎

Lines changed: 202 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,202 @@
1+
(module
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(type $st (sub (shared (struct))))
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(type $st' (sub (shared (struct (field i32)))))
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(type $at (shared (array i8)))
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(type $st-sub1 (sub $st (shared (struct))))
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(type $st-sub2 (sub $st (shared (struct))))
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(type $st'-sub1 (sub $st' (shared (struct (field i32)))))
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(type $st'-sub2 (sub $st' (shared (struct (field i32)))))
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(table 20 (ref null (shared eq)))
11+
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(func (export "init")
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(table.set (i32.const 0) (ref.null (shared eq)))
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(table.set (i32.const 1) (ref.null (shared i31)))
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(table.set (i32.const 2) (ref.i31_shared (i32.const 7)))
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(table.set (i32.const 3) (ref.i31_shared (i32.const 7)))
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(table.set (i32.const 4) (ref.i31_shared (i32.const 8)))
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(table.set (i32.const 5) (struct.new_default $st))
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(table.set (i32.const 6) (struct.new_default $st))
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(table.set (i32.const 7) (array.new_default $at (i32.const 0)))
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(table.set (i32.const 8) (array.new_default $at (i32.const 0)))
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)
23+
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(func (export "eq") (param $i i32) (param $j i32) (result i32)
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(ref.eq (table.get (local.get $i)) (table.get (local.get $j)))
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)
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)
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(invoke "init")
30+
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(assert_return (invoke "eq" (i32.const 0) (i32.const 0)) (i32.const 1))
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(assert_return (invoke "eq" (i32.const 0) (i32.const 1)) (i32.const 1))
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(assert_return (invoke "eq" (i32.const 0) (i32.const 2)) (i32.const 0))
34+
(assert_return (invoke "eq" (i32.const 0) (i32.const 3)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 0) (i32.const 4)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 0) (i32.const 5)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 0) (i32.const 6)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 0) (i32.const 7)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 0) (i32.const 8)) (i32.const 0))
40+
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(assert_return (invoke "eq" (i32.const 1) (i32.const 0)) (i32.const 1))
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(assert_return (invoke "eq" (i32.const 1) (i32.const 1)) (i32.const 1))
43+
(assert_return (invoke "eq" (i32.const 1) (i32.const 2)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 1) (i32.const 3)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 1) (i32.const 4)) (i32.const 0))
46+
(assert_return (invoke "eq" (i32.const 1) (i32.const 5)) (i32.const 0))
47+
(assert_return (invoke "eq" (i32.const 1) (i32.const 6)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 1) (i32.const 7)) (i32.const 0))
49+
(assert_return (invoke "eq" (i32.const 1) (i32.const 8)) (i32.const 0))
50+
51+
(assert_return (invoke "eq" (i32.const 2) (i32.const 0)) (i32.const 0))
52+
(assert_return (invoke "eq" (i32.const 2) (i32.const 1)) (i32.const 0))
53+
(assert_return (invoke "eq" (i32.const 2) (i32.const 2)) (i32.const 1))
54+
(assert_return (invoke "eq" (i32.const 2) (i32.const 3)) (i32.const 1))
55+
(assert_return (invoke "eq" (i32.const 2) (i32.const 4)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 2) (i32.const 5)) (i32.const 0))
57+
(assert_return (invoke "eq" (i32.const 2) (i32.const 6)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 2) (i32.const 7)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 2) (i32.const 8)) (i32.const 0))
60+
61+
(assert_return (invoke "eq" (i32.const 3) (i32.const 0)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 3) (i32.const 1)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 3) (i32.const 2)) (i32.const 1))
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(assert_return (invoke "eq" (i32.const 3) (i32.const 3)) (i32.const 1))
65+
(assert_return (invoke "eq" (i32.const 3) (i32.const 4)) (i32.const 0))
66+
(assert_return (invoke "eq" (i32.const 3) (i32.const 5)) (i32.const 0))
67+
(assert_return (invoke "eq" (i32.const 3) (i32.const 6)) (i32.const 0))
68+
(assert_return (invoke "eq" (i32.const 3) (i32.const 7)) (i32.const 0))
69+
(assert_return (invoke "eq" (i32.const 3) (i32.const 8)) (i32.const 0))
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71+
(assert_return (invoke "eq" (i32.const 4) (i32.const 0)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 4) (i32.const 1)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 4) (i32.const 2)) (i32.const 0))
74+
(assert_return (invoke "eq" (i32.const 4) (i32.const 3)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 4) (i32.const 4)) (i32.const 1))
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(assert_return (invoke "eq" (i32.const 4) (i32.const 5)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 4) (i32.const 6)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 4) (i32.const 7)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 4) (i32.const 8)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 5) (i32.const 0)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 5) (i32.const 1)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 5) (i32.const 2)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 5) (i32.const 3)) (i32.const 0))
85+
(assert_return (invoke "eq" (i32.const 5) (i32.const 4)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 5) (i32.const 5)) (i32.const 1))
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(assert_return (invoke "eq" (i32.const 5) (i32.const 6)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 5) (i32.const 7)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 5) (i32.const 8)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 6) (i32.const 0)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 6) (i32.const 1)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 6) (i32.const 2)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 6) (i32.const 3)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 6) (i32.const 4)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 6) (i32.const 5)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 6) (i32.const 6)) (i32.const 1))
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(assert_return (invoke "eq" (i32.const 6) (i32.const 7)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 6) (i32.const 8)) (i32.const 0))
100+
101+
(assert_return (invoke "eq" (i32.const 7) (i32.const 0)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 7) (i32.const 1)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 7) (i32.const 2)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 7) (i32.const 3)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 7) (i32.const 4)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 7) (i32.const 5)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 7) (i32.const 6)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 7) (i32.const 7)) (i32.const 1))
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(assert_return (invoke "eq" (i32.const 7) (i32.const 8)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 8) (i32.const 0)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 8) (i32.const 1)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 8) (i32.const 2)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 8) (i32.const 3)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 8) (i32.const 4)) (i32.const 0))
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(assert_return (invoke "eq" (i32.const 8) (i32.const 5)) (i32.const 0))
117+
(assert_return (invoke "eq" (i32.const 8) (i32.const 6)) (i32.const 0))
118+
(assert_return (invoke "eq" (i32.const 8) (i32.const 7)) (i32.const 0))
119+
(assert_return (invoke "eq" (i32.const 8) (i32.const 8)) (i32.const 1))
120+
121+
(assert_invalid
122+
(module
123+
(func (export "eq") (param $r (ref (shared any))) (result i32)
124+
(ref.eq (local.get $r) (local.get $r))
125+
)
126+
)
127+
"type mismatch"
128+
)
129+
(assert_invalid
130+
(module
131+
(func (export "eq") (param $r (ref null (shared any))) (result i32)
132+
(ref.eq (local.get $r) (local.get $r))
133+
)
134+
)
135+
"type mismatch"
136+
)
137+
(assert_invalid
138+
(module
139+
(func (export "eq") (param $r (ref null (shared func))) (result i32)
140+
(ref.eq (local.get $r) (local.get $r))
141+
)
142+
)
143+
"type mismatch"
144+
)
145+
(assert_invalid
146+
(module
147+
(func (export "eq") (param $r (ref null (shared func))) (result i32)
148+
(ref.eq (local.get $r) (local.get $r))
149+
)
150+
)
151+
"type mismatch"
152+
)
153+
(assert_invalid
154+
(module
155+
(func (export "eq") (param $r (ref (shared extern))) (result i32)
156+
(ref.eq (local.get $r) (local.get $r))
157+
)
158+
)
159+
"type mismatch"
160+
)
161+
(assert_invalid
162+
(module
163+
(func (export "eq") (param $r (ref null (shared extern))) (result i32)
164+
(ref.eq (local.get $r) (local.get $r))
165+
)
166+
)
167+
"type mismatch"
168+
)
169+
170+
;; Mixed shared / unshared eq
171+
(assert_invalid
172+
(module
173+
(func (export "eq") (param $r1 (ref eq)) (param $r2 (ref (shared eq))) (result i32)
174+
(ref.eq (local.get $r1) (local.get $r2))
175+
)
176+
)
177+
"type mismatch"
178+
)
179+
(assert_invalid
180+
(module
181+
(func (export "eq") (param $r1 (ref (shared eq))) (param $r2 (ref eq)) (result i32)
182+
(ref.eq (local.get $r1) (local.get $r2))
183+
)
184+
)
185+
"type mismatch"
186+
)
187+
(assert_invalid
188+
(module
189+
(func (export "eq") (param $r1 eqref) (param $r2 (ref null (shared eq))) (result i32)
190+
(ref.eq (local.get $r1) (local.get $r2))
191+
)
192+
)
193+
"type mismatch"
194+
)
195+
(assert_invalid
196+
(module
197+
(func (export "eq") (param $r1 (ref null (shared eq))) (param $r2 eqref) (result i32)
198+
(ref.eq (local.get $r1) (local.get $r2))
199+
)
200+
)
201+
"type mismatch"
202+
)

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