Bug 1664182 - Add JS::SetUseOffThreadParseGlobal and js::UseOffThreadParseGlobal, replacing JS::ContextOptions::setUseOffThreadParseGlobal. r=tcampbell

Differential Revision: https://phabricator.services.mozilla.com/D89784

dom/workers/RuntimeService.cpp

@@ -290,9 +290,7 @@ void LoadContextOptions(const char* aPrefName, void* /* aClosure */) {
       .setPrivateClassFields(
           GetWorkerPref<bool>("experimental.private_fields"_ns))
       .setPrivateClassMethods(
-          GetWorkerPref<bool>("experimental.private_methods"_ns))
-      .setUseOffThreadParseGlobal(
-          GetWorkerPref<bool>("off_thread_parse_global"_ns));
+          GetWorkerPref<bool>("experimental.private_methods"_ns));
 
   nsCOMPtr<nsIXULRuntime> xr = do_GetService("@mozilla.org/xre/runtime;1");
   if (xr) {

js/public/ContextOptions.h

@@ -45,8 +45,7 @@ class JS_PUBLIC_API ContextOptions {
 #endif
         fuzzing_(false),
         privateClassFields_(false),
-        privateClassMethods_(false),
-        useOffThreadParseGlobal_(true) {
+        privateClassMethods_(false) {
   }
 
   bool asmJS() const { return asmJS_; }
@@ -154,12 +153,6 @@ class JS_PUBLIC_API ContextOptions {
     return *this;
   }
 
-  bool useOffThreadParseGlobal() const { return useOffThreadParseGlobal_; }
-  ContextOptions& setUseOffThreadParseGlobal(bool use) {
-    useOffThreadParseGlobal_ = use;
-    return *this;
-  }
-
   // Override to allow disabling the eval restriction security checks for
   // this context.
   bool disableEvalSecurityChecks() const { return disableEvalSecurityChecks_; }
@@ -269,9 +262,6 @@ class JS_PUBLIC_API ContextOptions {
   bool fuzzing_ : 1;
   bool privateClassFields_ : 1;
   bool privateClassMethods_ : 1;
-
-  // See TransitiveCompileOptions.useOffThreadParseGlobal.
-  bool useOffThreadParseGlobal_ : 1;
 };
 
 JS_PUBLIC_API ContextOptions& ContextOptionsRef(JSContext* cx);

js/public/OffThreadScriptCompilation.h

@@ -134,6 +134,17 @@ extern JS_PUBLIC_API bool FinishMultiOffThreadScriptsDecoder(
 extern JS_PUBLIC_API void CancelMultiOffThreadScriptsDecoder(
     JSContext* cx, OffThreadToken* token);
 
+// Tell off-thread compilation to/not to use the parse global.
+// The default value is true.
+//
+// If set to false, off-thread compilation will compile to stencil, and
+// instantiate the stencil on main-thread.
+extern JS_PUBLIC_API void SetUseOffThreadParseGlobal(bool value);
+
 }  // namespace JS
 
+namespace js {
+extern bool UseOffThreadParseGlobal();
+}  // namespace js
+
 #endif /* js_OffThreadScriptCompilation_h */

js/src/builtin/TestingFunctions.cpp

@@ -62,6 +62,7 @@
 #include "js/friend/WindowProxy.h"    // js::ToWindowProxyIfWindow
 #include "js/HashTable.h"
 #include "js/LocaleSensitive.h"
+#include "js/OffThreadScriptCompilation.h"  // js::UseOffThreadParseGlobal
 #include "js/PropertySpec.h"
 #include "js/RegExpFlags.h"  // JS::RegExpFlag, JS::RegExpFlags
 #include "js/SourceText.h"
@@ -177,7 +178,7 @@ static bool GetRealmConfiguration(JSContext* cx, unsigned argc, Value* vp) {
     return false;
   }
 
-  bool offThreadParseGlobal = cx->options().useOffThreadParseGlobal();
+  bool offThreadParseGlobal = js::UseOffThreadParseGlobal();
   if (!JS_SetProperty(
           cx, info, "offThreadParseGlobal",
           offThreadParseGlobal ? TrueHandleValue : FalseHandleValue)) {

js/src/jsapi.cpp

@@ -61,7 +61,8 @@
 #include "js/JSON.h"
 #include "js/LocaleSensitive.h"
 #include "js/MemoryFunctions.h"
-#include "js/Object.h"  // JS::SetPrivate
+#include "js/Object.h"                      // JS::SetPrivate
+#include "js/OffThreadScriptCompilation.h"  // js::UseOffThreadParseGlobal
 #include "js/PropertySpec.h"
 #include "js/Proxy.h"
 #include "js/SliceBudget.h"
@@ -3545,7 +3546,7 @@ JS::CompileOptions::CompileOptions(JSContext* cx)
       cx->options().throwOnAsmJSValidationFailure();
   privateClassFields = cx->options().privateClassFields();
   privateClassMethods = cx->options().privateClassMethods();
-  useOffThreadParseGlobal = cx->options().useOffThreadParseGlobal();
+  useOffThreadParseGlobal = UseOffThreadParseGlobal();
 
   sourcePragmas_ = cx->options().sourcePragmas();
 

js/src/shell/js.cpp

@@ -109,10 +109,10 @@
 #include "js/Exception.h"                  // JS::StealPendingExceptionStack
 #include "js/experimental/CodeCoverage.h"  // js::EnableCodeCoverage
 #include "js/experimental/JitInfo.h"  // JSJit{Getter,Setter,Method}CallArgs, JSJitGetterInfo, JSJit{Getter,Setter}Op, JSJitInfo
-#include "js/experimental/SourceHook.h"    // js::{Set,Forget,}SourceHook
-#include "js/experimental/TypedData.h"     // JS_NewUint8Array
-#include "js/friend/DumpFunctions.h"       // JS::FormatStackDump
-#include "js/friend/StackLimits.h"  // js::CheckRecursionLimitConservative
+#include "js/experimental/SourceHook.h"  // js::{Set,Forget,}SourceHook
+#include "js/experimental/TypedData.h"   // JS_NewUint8Array
+#include "js/friend/DumpFunctions.h"     // JS::FormatStackDump
+#include "js/friend/StackLimits.h"       // js::CheckRecursionLimitConservative
 #include "js/friend/WindowProxy.h"  // js::IsWindowProxy, js::SetWindowProxyClass, js::ToWindowProxyIfWindow, js::ToWindowIfWindowProxy
 #include "js/GCAPI.h"               // JS::AutoCheckCannotGC
 #include "js/GCVector.h"
@@ -121,6 +121,7 @@
 #include "js/MemoryFunctions.h"
 #include "js/Modules.h"  // JS::GetModulePrivate, JS::SetModule{DynamicImport,Metadata,Resolve}Hook, JS::SetModulePrivate
 #include "js/Object.h"  // JS::GetClass, JS::GetCompartment, JS::GetReservedSlot, JS::SetReservedSlot
+#include "js/OffThreadScriptCompilation.h"  // JS::SetUseOffThreadParseGlobal
 #include "js/Printf.h"
 #include "js/PropertySpec.h"
 #include "js/Realm.h"
@@ -10270,8 +10271,9 @@ static bool SetContextOptions(JSContext* cx, const OptionParser& op) {
       .setAsyncStack(enableAsyncStacks)
       .setAsyncStackCaptureDebuggeeOnly(enableAsyncStackCaptureDebuggeeOnly)
       .setPrivateClassFields(enablePrivateClassFields)
-      .setPrivateClassMethods(enablePrivateClassMethods)
-      .setUseOffThreadParseGlobal(useOffThreadParseGlobal);
+      .setPrivateClassMethods(enablePrivateClassMethods);
+
+  JS::SetUseOffThreadParseGlobal(useOffThreadParseGlobal);
 
   if (op.getBoolOption("no-ion-for-main-context")) {
     JS::ContextOptionsRef(cx).setDisableIon();

js/src/vm/HelperThreads.cpp

@@ -17,8 +17,9 @@
 #include "frontend/BytecodeCompilation.h"
 #include "frontend/CompilationInfo.h"  // frontend::CompilationInfo, frontend::CompilationGCOutput
 #include "jit/IonCompileTask.h"
-#include "js/ContextOptions.h"      // JS::ContextOptions
-#include "js/friend/StackLimits.h"  // js::ReportOverRecursed
+#include "js/ContextOptions.h"              // JS::ContextOptions
+#include "js/friend/StackLimits.h"          // js::ReportOverRecursed
+#include "js/OffThreadScriptCompilation.h"  // js::UseOffThreadParseGlobal
 #include "js/SourceText.h"
 #include "js/UniquePtr.h"
 #include "js/Utility.h"
@@ -2072,7 +2073,9 @@ JSObject* GlobalHelperThreadState::finishModuleParseTask(
 
   MOZ_ASSERT(script->isModule());
 
-  if (!cx->options().useOffThreadParseGlobal()) {
+  // NOTE: StartOffThreadParseTask alters CompileOption only for decode task.
+  // UseOffThreadParseGlobal() should match CompileOption here.
+  if (!UseOffThreadParseGlobal()) {
     return script->module();
   }
 

js/src/vm/OffThreadScriptCompilation.cpp

@@ -207,3 +207,13 @@ JS_PUBLIC_API void JS::CancelMultiOffThreadScriptsDecoder(
   HelperThreadState().cancelParseTask(cx->runtime(),
                                       ParseTaskKind::MultiScriptsDecode, token);
 }
+
+namespace js {
+bool gUseOffThreadParseGlobal = true;
+}  // namespace js
+
+JS_PUBLIC_API void JS::SetUseOffThreadParseGlobal(bool value) {
+  gUseOffThreadParseGlobal = value;
+}
+
+bool js::UseOffThreadParseGlobal() { return gUseOffThreadParseGlobal; }

js/xpconnect/src/XPCJSContext.cpp

@@ -40,6 +40,7 @@
 #include "jsapi.h"
 #include "js/ContextOptions.h"
 #include "js/MemoryMetrics.h"
+#include "js/OffThreadScriptCompilation.h"
 #include "mozilla/dom/BindingUtils.h"
 #include "mozilla/dom/ContentChild.h"
 #include "mozilla/dom/Element.h"
@@ -866,6 +867,9 @@ static void LoadStartupJSPrefs(XPCJSContext* xpccx) {
   bool disableWasmHugeMemory =
       Preferences::GetBool(JS_OPTIONS_DOT_STR "wasm_disable_huge_memory");
 
+  bool useOffThreadParseGlobal =
+      Preferences::GetBool(JS_OPTIONS_DOT_STR "off_thread_parse_global");
+
   nsCOMPtr<nsIXULRuntime> xr = do_GetService("@mozilla.org/xre/runtime;1");
   if (xr) {
     bool safeMode = false;
@@ -927,6 +931,8 @@ static void LoadStartupJSPrefs(XPCJSContext* xpccx) {
     bool disabledHugeMemory = JS::DisableWasmHugeMemory();
     MOZ_RELEASE_ASSERT(disabledHugeMemory);
   }
+
+  JS::SetUseOffThreadParseGlobal(useOffThreadParseGlobal);
 }
 
 static void ReloadPrefsCallback(const char* pref, void* aXpccx) {
@@ -1001,9 +1007,6 @@ static void ReloadPrefsCallback(const char* pref, void* aXpccx) {
       Preferences::GetBool(JS_OPTIONS_DOT_STR "experimental.private_methods");
 #endif
 
-  bool useOffThreadParseGlobal =
-      Preferences::GetBool(JS_OPTIONS_DOT_STR "off_thread_parse_global");
-
 #ifdef JS_GC_ZEAL
   int32_t zeal = Preferences::GetInt(JS_OPTIONS_DOT_STR "gczeal", -1);
   int32_t zeal_frequency = Preferences::GetInt(
@@ -1047,8 +1050,7 @@ static void ReloadPrefsCallback(const char* pref, void* aXpccx) {
       .setThrowOnDebuggeeWouldRun(throwOnDebuggeeWouldRun)
       .setDumpStackOnDebuggeeWouldRun(dumpStackOnDebuggeeWouldRun)
       .setPrivateClassFields(privateFieldsEnabled)
-      .setPrivateClassMethods(privateMethodsEnabled)
-      .setUseOffThreadParseGlobal(useOffThreadParseGlobal);
+      .setPrivateClassMethods(privateMethodsEnabled);
 
   nsCOMPtr<nsIXULRuntime> xr = do_GetService("@mozilla.org/xre/runtime;1");
   if (xr) {