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[Stack Switching] Trap on cont.bind of a null continuation #8477

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Merged
kripken merged 1 commit into from
Mar 17, 2026
Merged

[Stack Switching] Trap on cont.bind of a null continuation #8477

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7 changes: 6 additions & 1 deletion src/wasm-interpreter.h
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Original file line number Diff line number Diff line change
Expand Up @@ -4770,9 +4770,14 @@ class ModuleRunnerBase : public ExpressionRunner<SubType> {
VISIT_ARGUMENTS(flow, curr->operands, arguments)
VISIT(cont, curr->cont)

auto contValue = cont.getSingleValue();
if (contValue.isNull()) {
trap("null ref");
}

// Create a new continuation, copying the old but with the new type +
// arguments.
auto old = cont.getSingleValue().getContData();
auto old = contValue.getContData();
auto newData = *old;
newData.type = curr->type.getHeapType();
for (auto arg : arguments) {
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11 changes: 11 additions & 0 deletions test/lit/exec/cont_bindings.wast
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Expand Up @@ -43,5 +43,16 @@
)
)
)

;; CHECK: [fuzz-exec] calling null-binding
;; CHECK-NEXT: [trap null ref]
(func $null-binding (export "null-binding")
(drop
(cont.bind $C1 $C2
(i32.const 42)
(ref.null $C1)
)
)
)
)

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