1 files changed, 70 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/wasm/features.js b/js/src/jit-test/tests/wasm/features.js
new file mode 100644
index 0000000000..52ee25cb92
--- /dev/null
+++ b/js/src/jit-test/tests/wasm/features.js
@@ -0,0 +1,70 @@
+// |jit-test| test-also=--wasm-gc;
+
+// Test that if a feature is 'experimental' then we must be in a nightly build,
+// and if a feature is 'released' then it must be enabled on release and beta.
+//
+// An experimental feature is allowed to be disabled by platform/feature flags,
+// we only require that it can never be enabled on release/beta builds.
+//
+// A released feature is allowed to be disabled on nightly. This is useful for
+// if we're testing out a new compiler/configuration where a released feature
+// is not supported yet. We only require that on release/beta, the feature must
+// be enabled.
+//
+// As features are advanced, this test must be manually updated.
+//
+// NOTE0: The |jit-test| directive must be updated with all opt-in shell flags
+//        for experimental features for this to work correctly.
+// NOTE1: This test relies on feature functions accurately guarding use of the
+//        feature to work correctly. All features should have a 'disabled.js'
+//        test to verify this. Basic testing for this is included with each
+//        feature in this test for sanity.
+
+let { release_or_beta } = getBuildConfiguration();
+let nightly = !release_or_beta;
+
+let nightlyOnlyFeatures = [
+  ['gc', wasmGcEnabled(), `(module (type $s (struct)) (func (param (ref null $s))))`],
+];
+
+for (let [name, enabled, test] of nightlyOnlyFeatures) {
+  if (enabled) {
+    assertEq(nightly, true, `${name} must be enabled only on nightly`);
+    wasmEvalText(test);
+  } else {
+    assertErrorMessage(() => wasmEvalText(test), WebAssembly.CompileError, /./);
+  }
+}
+
+// These are features that are enabled in beta/release but may be disabled at
+// run-time for other reasons.  The best we can do for these features is to say
+// that if one claims to be supported then it must work, and otherwise there
+// must be a CompileError.
+
+let releasedFeaturesMaybeDisabledAnyway = [
+  // SIMD will be disabled dynamically on x86/x64 if the hardware isn't SSE4.1+.
+  ['simd', wasmSimdEnabled(), `(module (func (result v128) i32.const 0 i8x16.splat))`]
+];
+
+for (let [name, enabled, test] of releasedFeaturesMaybeDisabledAnyway) {
+  if (release_or_beta) {
+    if (enabled) {
+      wasmEvalText(test);
+    } else {
+      assertErrorMessage(() => wasmEvalText(test), WebAssembly.CompileError, /./);
+    }
+  }
+}
+
+let releasedFeatures = [
+  ['multi-value', wasmMultiValueEnabled(), `(module (func (result i32 i32) i32.const 0 i32.const 0))`],
+  ['threads', wasmThreadsEnabled(), `(module (memory 1 1 shared))`],
+  ['reference-types', wasmReftypesEnabled(), `(module (func (param externref)))`],
+];
+
+for (let [name, enabled, test] of releasedFeatures) {
+  if (release_or_beta) {
+    assertEq(enabled, true, `${name} must be enabled on release and beta`);
+    wasmEvalText(test);
+  }
+}