import from UXP: JS - support for Array.prototype.values() (f8591643)

dom/workers/RuntimeService.cpp

@@ -301,7 +301,9 @@ LoadContextOptions(const char* aPrefName, void* /* aClosure */)
                 .setNativeRegExp(GetWorkerPref<bool>(NS_LITERAL_CSTRING("native_regexp")))
                 .setAsyncStack(GetWorkerPref<bool>(NS_LITERAL_CSTRING("asyncstack")))
                 .setWerror(GetWorkerPref<bool>(NS_LITERAL_CSTRING("werror")))
-                .setExtraWarnings(GetWorkerPref<bool>(NS_LITERAL_CSTRING("strict")));
+                .setExtraWarnings(GetWorkerPref<bool>(NS_LITERAL_CSTRING("strict")))
+                .setArrayProtoValues(GetWorkerPref<bool>(
+                      NS_LITERAL_CSTRING("array_prototype_values")));
 
   RuntimeService::SetDefaultContextOptions(contextOptions);
 

js/src/jsapi.h

@@ -1113,6 +1113,7 @@ class JS_PUBLIC_API(ContextOptions) {
         werror_(false),
         strictMode_(false),
         extraWarnings_(false),
+        arrayProtoValues_(true),
 #ifdef NIGHTLY_BUILD
         forEachStatement_(false)
 #else
@@ -1252,6 +1253,12 @@ class JS_PUBLIC_API(ContextOptions) {
         return *this;
     }
 
+    bool arrayProtoValues() const { return arrayProtoValues_; }
+    ContextOptions& setArrayProtoValues(bool flag) {
+        arrayProtoValues_ = flag;
+        return *this;
+    }
+
   private:
     bool baseline_ : 1;
     bool ion_ : 1;
@@ -1268,6 +1275,7 @@ class JS_PUBLIC_API(ContextOptions) {
     bool werror_ : 1;
     bool strictMode_ : 1;
     bool extraWarnings_ : 1;
+    bool arrayProtoValues_ : 1;
     bool forEachStatement_: 1;
 };
 

js/src/jsarray.cpp

@@ -3147,9 +3147,7 @@ static const JSFunctionSpec array_methods[] = {
     JS_SELF_HOSTED_SYM_FN(iterator,  "ArrayValues",      0,0),
     JS_SELF_HOSTED_FN("entries",     "ArrayEntries",     0,0),
     JS_SELF_HOSTED_FN("keys",        "ArrayKeys",        0,0),
-#ifdef NIGHTLY_BUILD
     JS_SELF_HOSTED_FN("values",      "ArrayValues",      0,0),
-#endif
 
     /* ES7 additions */
     JS_SELF_HOSTED_FN("includes",    "ArrayIncludes",    2,0),

js/src/jsobj.cpp

@@ -2925,6 +2925,11 @@ DefineFunctionFromSpec(JSContext* cx, HandleObject obj, const JSFunctionSpec* fs
     if (!PropertySpecNameToId(cx, fs->name, &id))
         return false;
 
+    if (StandardProtoKeyOrNull(obj) == JSProto_Array && id == NameToId(cx->names().values)) {
+        if (!cx->options().arrayProtoValues())
+            return true;
+    }
+
     JSFunction* fun = NewFunctionFromSpec(cx, fs, id);
     if (!fun)
         return false;

js/src/shell/js.cpp

@@ -320,6 +320,7 @@ static bool enableNativeRegExp = false;
 static bool enableUnboxedArrays = false;
 static bool enableSharedMemory = SHARED_MEMORY_DEFAULT;
 static bool enableWasmAlwaysBaseline = false;
+static bool enableArrayProtoValues = true;
 static bool printTiming = false;
 static const char* jsCacheDir = nullptr;
 static const char* jsCacheAsmJSPath = nullptr;
@@ -7279,6 +7280,7 @@ SetContextOptions(JSContext* cx, const OptionParser& op)
     enableNativeRegExp = !op.getBoolOption("no-native-regexp");
     enableUnboxedArrays = op.getBoolOption("unboxed-arrays");
     enableWasmAlwaysBaseline = op.getBoolOption("wasm-always-baseline");
+    enableArrayProtoValues = !op.getBoolOption("no-array-proto-values");
 
     JS::ContextOptionsRef(cx).setBaseline(enableBaseline)
                              .setIon(enableIon)
@@ -7287,7 +7289,8 @@ SetContextOptions(JSContext* cx, const OptionParser& op)
                              .setWasmAlwaysBaseline(enableWasmAlwaysBaseline)
                              .setWasmAllowDebugging(true)
                              .setNativeRegExp(enableNativeRegExp)
-                             .setUnboxedArrays(enableUnboxedArrays);
+                             .setUnboxedArrays(enableUnboxedArrays)
+                             .setArrayProtoValues(enableArrayProtoValues);
 
     if (op.getBoolOption("wasm-check-bce"))
         jit::JitOptions.wasmAlwaysCheckBounds = true;
@@ -7559,7 +7562,8 @@ SetWorkerContextOptions(JSContext* cx)
                              .setWasmAlwaysBaseline(enableWasmAlwaysBaseline)
                              .setWasmAllowDebugging(true)
                              .setNativeRegExp(enableNativeRegExp)
-                             .setUnboxedArrays(enableUnboxedArrays);
+                             .setUnboxedArrays(enableUnboxedArrays)
+                             .setArrayProtoValues(enableArrayProtoValues);
     cx->setOffthreadIonCompilationEnabled(offthreadCompilation);
     cx->profilingScripts = enableCodeCoverage || enableDisassemblyDumps;
 
@@ -7732,6 +7736,7 @@ main(int argc, char** argv, char** envp)
         || !op.addBoolOption('\0', "unboxed-arrays", "Allow creating unboxed arrays")
         || !op.addBoolOption('\0', "wasm-always-baseline", "Enable wasm baseline compiler when possible")
         || !op.addBoolOption('\0', "wasm-check-bce", "Always generate wasm bounds check, even redundant ones.")
+        || !op.addBoolOption('\0', "no-array-proto-values", "Remove Array.prototype.values")
 #ifdef ENABLE_SHARED_ARRAY_BUFFER
         || !op.addStringOption('\0', "shared-memory", "on/off",
                                "SharedArrayBuffer and Atomics "

js/xpconnect/src/XPCJSContext.cpp

@@ -1503,6 +1503,8 @@ ReloadPrefsCallback(const char* pref, void* data)
     sExtraWarningsForSystemJS = Preferences::GetBool(JS_OPTIONS_DOT_STR "strict.debug");
 #endif
 
+    bool arrayProtoValues = Preferences::GetBool(JS_OPTIONS_DOT_STR "array_prototype_values");
+
     JS::ContextOptionsRef(cx).setBaseline(useBaseline)
                              .setIon(useIon)
                              .setAsmJS(useAsmJS)
@@ -1514,7 +1516,8 @@ ReloadPrefsCallback(const char* pref, void* data)
                              .setThrowOnDebuggeeWouldRun(throwOnDebuggeeWouldRun)
                              .setDumpStackOnDebuggeeWouldRun(dumpStackOnDebuggeeWouldRun)
                              .setWerror(werror)
-                             .setExtraWarnings(extraWarnings);
+                             .setExtraWarnings(extraWarnings)
+                             .setArrayProtoValues(arrayProtoValues);
 
     JS_SetParallelParsingEnabled(cx, parallelParsing);
     JS_SetOffthreadIonCompilationEnabled(cx, offthreadIonCompilation);

js/xpconnect/tests/chrome/test_xrayToJS.xul

@@ -202,9 +202,9 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=933681
       "pop", "shift", "unshift", "splice", "concat", "slice", "lastIndexOf", "indexOf",
       "includes", "forEach", "map", "reduce", "reduceRight", "filter", "some", "every", "find",
       "findIndex", "copyWithin", "fill", Symbol.iterator, Symbol.unscopables, "entries", "keys",
-      "constructor"];
+      "values", "constructor"];
   if (isNightlyBuild) {
-    gPrototypeProperties['Array'].push("values");
+    // ...nothing now
   }
   gConstructorProperties['Array'] =
     constructorProps(["join", "reverse", "sort", "push", "pop", "shift",

modules/libpref/init/all.js

@@ -1263,6 +1263,8 @@ pref("dom.webcomponents.enabled",           false);
 pref("dom.webcomponents.customelements.enabled", false);
 
 pref("javascript.enabled",                  true);
+// Enable Array.prototype.values
+pref("javascript.options.array_prototype_values", true);
 pref("javascript.options.strict",           false);
 #ifdef DEBUG
 pref("javascript.options.strict.debug",     false);