1 files changed, 65 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/wasm/gc/bug-1879096.js b/js/src/jit-test/tests/wasm/gc/bug-1879096.js
new file mode 100644
index 0000000000..e71d2bac27
--- /dev/null
+++ b/js/src/jit-test/tests/wasm/gc/bug-1879096.js
@@ -0,0 +1,65 @@
+// |jit-test| test-also=--setpref=wasm_test_serialization; skip-if: !wasmGcEnabled()
+
+// Conditional branch instructions need to rewrite their stack types according
+// to the destination label types. This loses information but is mandated by
+// the spec.
+
+// br_if
+wasmFailValidateText(`(module
+  (func (result anyref)
+    ref.null array      ;; stack: [arrayref]
+    ref.null struct     ;; stack: [arrayref structref]
+    i32.const 0         ;; stack: [arrayref structref i32]
+    br_if 0             ;; stack: [arrayref anyref]
+    ref.eq              ;; should fail (anyref is not eq)
+    unreachable
+  )
+)`, /type mismatch: expression has type anyref but expected eqref/);
+
+// br_on_null
+wasmFailValidateText(`(module
+  (func (param externref) (result anyref)
+    ref.null array      ;; stack: [arrayref]
+    local.get 0         ;; stack: [arrayref externref]
+    br_on_null 0        ;; stack: [anyref (ref extern)]
+    drop                ;; stack: [anyref]
+    array.len           ;; should fail
+    unreachable
+  )
+)`, /type mismatch: expression has type anyref but expected arrayref/);
+
+// br_on_non_null
+wasmFailValidateText(`(module
+  (func (param externref) (result anyref (ref extern))
+    ref.null array      ;; stack: [arrayref]
+    ref.null struct     ;; stack: [arrayref structref]
+    local.get 0         ;; stack: [arrayref structref externref]
+    br_on_non_null 0    ;; stack: [arrayref anyref]
+    ref.eq              ;; should fail (anyref is not eq)
+    unreachable
+  )
+)`, /type mismatch: expression has type anyref but expected eqref/);
+
+// br_on_cast
+wasmFailValidateText(`(module
+  (type $s (struct))
+  (func (result anyref (ref $s))
+    ref.null array                    ;; stack: [arrayref]
+    ref.null struct                   ;; stack: [arrayref structref]
+    br_on_cast 0 structref (ref $s)   ;; stack: [anyref structref]
+    ref.eq                            ;; should fail (anyref is not eq)
+    unreachable
+  )
+)`, /type mismatch: expression has type anyref but expected eqref/);
+
+// br_on_cast_fail
+wasmFailValidateText(`(module
+  (type $s (struct))
+  (func (result anyref anyref)
+    ref.null array                        ;; stack: [arrayref]
+    ref.null struct                       ;; stack: [arrayref structref]
+    br_on_cast_fail 0 structref (ref $s)  ;; stack: [anyref (ref $s)]
+    ref.eq                                ;; should fail (anyref is not eq)
+    unreachable
+  )
+)`, /type mismatch: expression has type anyref but expected eqref/);