Issue mcp-graveyard/UXP%618 - Report source position information (line/column)

Report source position information for module export resolution failures.

Ref: BZ 1362098

7 files changed, 161 insertions, 39 deletions

diff --git a/js/src/builtin/Module.js b/js/src/builtin/Module.js
index 064293670..b3365b505 100644
--- a/js/src/builtin/Module.js
+++ b/js/src/builtin/Module.js
@@ -436,8 +436,10 @@ function ModuleDeclarationEnvironmentSetup(module)
         let resolution = callFunction(module.resolveExport, module, e.exportName);
         assert(resolution.resolved || resolution.module,
                "Unexpected failure to resolve export in ModuleDeclarationEnvironmentSetup");
-        if (!resolution.resolved)
-            return ResolutionError(resolution, "indirectExport", e.exportName)
+        if (!resolution.resolved) {
+            return ResolutionError(resolution, "indirectExport", e.exportName,
+                                   e.lineNumber, e.columnNumber)
+        }
     }
 
     // Steps 5-6
@@ -459,8 +461,10 @@ function ModuleDeclarationEnvironmentSetup(module)
             if (!resolution.resolved && !resolution.module)
                 resolution.module = module;
 
-            if (!resolution.resolved)
-                return ResolutionError(resolution, "import", imp.importName);
+            if (!resolution.resolved) {
+                return ResolutionError(resolution, "import", imp.importName,
+                                       imp.lineNumber, imp.columnNumber);
+            }
 
             CreateImportBinding(env, imp.localName, resolution.module, resolution.bindingName);
         }
@@ -470,7 +474,7 @@ function ModuleDeclarationEnvironmentSetup(module)
 }
 
 // 15.2.1.16.4.3 ResolutionError(module)
-function ResolutionError(resolution, kind, name)
+function ResolutionError(resolution, kind, name, line, column)
 {
     let module = resolution.module;
     assert(module !== null,
@@ -483,21 +487,22 @@ function ResolutionError(resolution, kind, name)
     assert(kind === "import" || kind === "indirectExport",
            "Unexpected kind in ResolutionError");
 
-    let message;
+    assert(line > 0,
+           "Line number should be present for all imports and indirect exports");
+
+    let errorNumber;
     if (kind === "import") {
-        message = resolution.ambiguous ? JSMSG_AMBIGUOUS_IMPORT
-                                       : JSMSG_MISSING_IMPORT;
+        errorNumber = resolution.ambiguous ? JSMSG_AMBIGUOUS_IMPORT
+                                           : JSMSG_MISSING_IMPORT;
     } else {
-        message = resolution.ambiguous ? JSMSG_AMBIGUOUS_INDIRECT_EXPORT
-                                       : JSMSG_MISSING_INDIRECT_EXPORT;
+        errorNumber = resolution.ambiguous ? JSMSG_AMBIGUOUS_INDIRECT_EXPORT
+                                           : JSMSG_MISSING_INDIRECT_EXPORT;
     }
 
-    try {
-        ThrowSyntaxError(message, name);
-    } catch (error) {
-        RecordModuleError(module, error);
-        throw error;
-    }
+    let message = GetErrorMessage(errorNumber) + ": " + name;
+    let error = CreateModuleSyntaxError(module, line, column, message);
+    RecordModuleError(module, error);
+    throw error;
 }
 
 // 15.2.1.16.5 ModuleEvaluate()
diff --git a/js/src/builtin/ModuleObject.cpp b/js/src/builtin/ModuleObject.cpp
index 0a836c75b..09193c9ca 100644
--- a/js/src/builtin/ModuleObject.cpp
+++ b/js/src/builtin/ModuleObject.cpp
@@ -70,6 +70,15 @@ ModuleValueGetter(JSContext* cx, unsigned argc, Value* vp)
         return &value.toString()->asAtom();                                   \
     }
 
+#define DEFINE_UINT32_ACCESSOR_METHOD(cls, name)                              \
+    uint32_t                                                                  \
+    cls::name() const                                                         \
+    {                                                                         \
+        Value value = cls##_##name##Value(this);                              \
+        MOZ_ASSERT(value.toInt32() >= 0);                                     \
+        return value.toInt32();                                               \
+    }
+
 ///////////////////////////////////////////////////////////////////////////
 // ImportEntryObject
 
@@ -83,10 +92,14 @@ ImportEntryObject::class_ = {
 DEFINE_GETTER_FUNCTIONS(ImportEntryObject, moduleRequest, ModuleRequestSlot)
 DEFINE_GETTER_FUNCTIONS(ImportEntryObject, importName, ImportNameSlot)
 DEFINE_GETTER_FUNCTIONS(ImportEntryObject, localName, LocalNameSlot)
+DEFINE_GETTER_FUNCTIONS(ImportEntryObject, lineNumber, LineNumberSlot)
+DEFINE_GETTER_FUNCTIONS(ImportEntryObject, columnNumber, ColumnNumberSlot)
 
 DEFINE_ATOM_ACCESSOR_METHOD(ImportEntryObject, moduleRequest)
 DEFINE_ATOM_ACCESSOR_METHOD(ImportEntryObject, importName)
 DEFINE_ATOM_ACCESSOR_METHOD(ImportEntryObject, localName)
+DEFINE_UINT32_ACCESSOR_METHOD(ImportEntryObject, lineNumber)
+DEFINE_UINT32_ACCESSOR_METHOD(ImportEntryObject, columnNumber)
 
 /* static */ bool
 ImportEntryObject::isInstance(HandleValue value)
@@ -101,6 +114,8 @@ GlobalObject::initImportEntryProto(JSContext* cx, Handle<GlobalObject*> global)
         JS_PSG("moduleRequest", ImportEntryObject_moduleRequestGetter, 0),
         JS_PSG("importName", ImportEntryObject_importNameGetter, 0),
         JS_PSG("localName", ImportEntryObject_localNameGetter, 0),
+        JS_PSG("lineNumber", ImportEntryObject_lineNumberGetter, 0),
+        JS_PSG("columnNumber", ImportEntryObject_columnNumberGetter, 0),
         JS_PS_END
     };
 
@@ -119,8 +134,12 @@ GlobalObject::initImportEntryProto(JSContext* cx, Handle<GlobalObject*> global)
 ImportEntryObject::create(ExclusiveContext* cx,
                           HandleAtom moduleRequest,
                           HandleAtom importName,
-                          HandleAtom localName)
+                          HandleAtom localName,
+                          uint32_t lineNumber,
+                          uint32_t columnNumber)
 {
+    MOZ_ASSERT(lineNumber > 0);
+
     RootedObject proto(cx, cx->global()->getImportEntryPrototype());
     RootedObject obj(cx, NewObjectWithGivenProto(cx, &class_, proto));
     if (!obj)
@@ -130,6 +149,8 @@ ImportEntryObject::create(ExclusiveContext* cx,
     self->initReservedSlot(ModuleRequestSlot, StringValue(moduleRequest));
     self->initReservedSlot(ImportNameSlot, StringValue(importName));
     self->initReservedSlot(LocalNameSlot, StringValue(localName));
+    self->initReservedSlot(LineNumberSlot, Int32Value(lineNumber));
+    self->initReservedSlot(ColumnNumberSlot, Int32Value(columnNumber));
     return self;
 }
 
@@ -147,11 +168,15 @@ DEFINE_GETTER_FUNCTIONS(ExportEntryObject, exportName, ExportNameSlot)
 DEFINE_GETTER_FUNCTIONS(ExportEntryObject, moduleRequest, ModuleRequestSlot)
 DEFINE_GETTER_FUNCTIONS(ExportEntryObject, importName, ImportNameSlot)
 DEFINE_GETTER_FUNCTIONS(ExportEntryObject, localName, LocalNameSlot)
+DEFINE_GETTER_FUNCTIONS(ExportEntryObject, lineNumber, LineNumberSlot)
+DEFINE_GETTER_FUNCTIONS(ExportEntryObject, columnNumber, ColumnNumberSlot)
 
 DEFINE_ATOM_OR_NULL_ACCESSOR_METHOD(ExportEntryObject, exportName)
 DEFINE_ATOM_OR_NULL_ACCESSOR_METHOD(ExportEntryObject, moduleRequest)
 DEFINE_ATOM_OR_NULL_ACCESSOR_METHOD(ExportEntryObject, importName)
 DEFINE_ATOM_OR_NULL_ACCESSOR_METHOD(ExportEntryObject, localName)
+DEFINE_UINT32_ACCESSOR_METHOD(ExportEntryObject, lineNumber)
+DEFINE_UINT32_ACCESSOR_METHOD(ExportEntryObject, columnNumber)
 
 /* static */ bool
 ExportEntryObject::isInstance(HandleValue value)
@@ -167,6 +192,8 @@ GlobalObject::initExportEntryProto(JSContext* cx, Handle<GlobalObject*> global)
         JS_PSG("moduleRequest", ExportEntryObject_moduleRequestGetter, 0),
         JS_PSG("importName", ExportEntryObject_importNameGetter, 0),
         JS_PSG("localName", ExportEntryObject_localNameGetter, 0),
+        JS_PSG("lineNumber", ExportEntryObject_lineNumberGetter, 0),
+        JS_PSG("columnNumber", ExportEntryObject_columnNumberGetter, 0),
         JS_PS_END
     };
 
@@ -192,8 +219,13 @@ ExportEntryObject::create(ExclusiveContext* cx,
                           HandleAtom maybeExportName,
                           HandleAtom maybeModuleRequest,
                           HandleAtom maybeImportName,
-                          HandleAtom maybeLocalName)
+                          HandleAtom maybeLocalName,
+                          uint32_t lineNumber,
+                          uint32_t columnNumber)
 {
+    // Line and column numbers are optional for export entries since direct
+    // entries are checked at parse time.
+
     RootedObject proto(cx, cx->global()->getExportEntryPrototype());
     RootedObject obj(cx, NewObjectWithGivenProto(cx, &class_, proto));
     if (!obj)
@@ -204,6 +236,8 @@ ExportEntryObject::create(ExclusiveContext* cx,
     self->initReservedSlot(ModuleRequestSlot, StringOrNullValue(maybeModuleRequest));
     self->initReservedSlot(ImportNameSlot, StringOrNullValue(maybeImportName));
     self->initReservedSlot(LocalNameSlot, StringOrNullValue(maybeLocalName));
+    self->initReservedSlot(LineNumberSlot, Int32Value(lineNumber));
+    self->initReservedSlot(ColumnNumberSlot, Int32Value(columnNumber));
     return self;
 }
 
@@ -1025,9 +1059,11 @@ GlobalObject::initModuleProto(JSContext* cx, Handle<GlobalObject*> global)
 ///////////////////////////////////////////////////////////////////////////
 // ModuleBuilder
 
-ModuleBuilder::ModuleBuilder(ExclusiveContext* cx, HandleModuleObject module)
+ModuleBuilder::ModuleBuilder(ExclusiveContext* cx, HandleModuleObject module,
+                             const frontend::TokenStream& tokenStream)
   : cx_(cx),
     module_(cx, module),
+    tokenStream_(tokenStream),
     requestedModules_(cx, AtomVector(cx)),
     importedBoundNames_(cx, AtomVector(cx)),
     importEntries_(cx, ImportEntryVector(cx)),
@@ -1052,6 +1088,7 @@ ModuleBuilder::buildTables()
                     if (!localExportEntries_.append(exp))
                         return false;
                 } else {
+                    MOZ_ASSERT(exp->lineNumber());
                     RootedAtom exportName(cx_, exp->exportName());
                     RootedAtom moduleRequest(cx_, importEntry->moduleRequest());
                     RootedAtom importName(cx_, importEntry->importName());
@@ -1060,7 +1097,9 @@ ModuleBuilder::buildTables()
                                                             exportName,
                                                             moduleRequest,
                                                             importName,
-                                                            nullptr);
+                                                            nullptr,
+                                                            exp->lineNumber(),
+                                                            exp->columnNumber());
                     if (!exportEntry || !indirectExportEntries_.append(exportEntry))
                         return false;
                 }
@@ -1069,6 +1108,7 @@ ModuleBuilder::buildTables()
             if (!starExportEntries_.append(exp))
                 return false;
         } else {
+            MOZ_ASSERT(exp->lineNumber());
             if (!indirectExportEntries_.append(exp))
                 return false;
         }
@@ -1133,8 +1173,12 @@ ModuleBuilder::processImport(frontend::ParseNode* pn)
         if (!importedBoundNames_.append(localName))
             return false;
 
+        uint32_t line;
+        uint32_t column;
+        tokenStream_.srcCoords.lineNumAndColumnIndex(spec->pn_left->pn_pos.begin, &line, &column);
+
         RootedImportEntryObject importEntry(cx_);
-        importEntry = ImportEntryObject::create(cx_, module, importName, localName);
+        importEntry = ImportEntryObject::create(cx_, module, importName, localName, line, column);
         if (!importEntry || !importEntries_.append(importEntry))
             return false;
     }
@@ -1165,7 +1209,7 @@ ModuleBuilder::processExport(frontend::ParseNode* pn)
             MOZ_ASSERT(spec->isKind(PNK_EXPORT_SPEC));
             RootedAtom localName(cx_, spec->pn_left->pn_atom);
             RootedAtom exportName(cx_, spec->pn_right->pn_atom);
-            if (!appendExportEntry(exportName, localName))
+            if (!appendExportEntry(exportName, localName, spec))
                 return false;
         }
         break;
@@ -1230,12 +1274,12 @@ ModuleBuilder::processExportFrom(frontend::ParseNode* pn)
         if (spec->isKind(PNK_EXPORT_SPEC)) {
             RootedAtom bindingName(cx_, spec->pn_left->pn_atom);
             RootedAtom exportName(cx_, spec->pn_right->pn_atom);
-            if (!appendExportFromEntry(exportName, module, bindingName))
+            if (!appendExportFromEntry(exportName, module, bindingName, spec->pn_left))
                 return false;
         } else {
             MOZ_ASSERT(spec->isKind(PNK_EXPORT_BATCH_SPEC));
             RootedAtom importName(cx_, cx_->names().star);
-            if (!appendExportFromEntry(nullptr, module, importName))
+            if (!appendExportFromEntry(nullptr, module, importName, spec))
                 return false;
         }
     }
@@ -1264,19 +1308,30 @@ ModuleBuilder::hasExportedName(JSAtom* name) const
 }
 
 bool
-ModuleBuilder::appendExportEntry(HandleAtom exportName, HandleAtom localName)
+ModuleBuilder::appendExportEntry(HandleAtom exportName, HandleAtom localName, ParseNode* node)
 {
+    uint32_t line = 0;
+    uint32_t column = 0;
+    if (node)
+        tokenStream_.srcCoords.lineNumAndColumnIndex(node->pn_pos.begin, &line, &column);
+
     Rooted<ExportEntryObject*> exportEntry(cx_);
-    exportEntry = ExportEntryObject::create(cx_, exportName, nullptr, nullptr, localName);
+    exportEntry = ExportEntryObject::create(cx_, exportName, nullptr, nullptr, localName,
+                                            line, column);
     return exportEntry && exportEntries_.append(exportEntry);
 }
 
 bool
 ModuleBuilder::appendExportFromEntry(HandleAtom exportName, HandleAtom moduleRequest,
-                                     HandleAtom importName)
+                                     HandleAtom importName, ParseNode* node)
 {
+    uint32_t line;
+    uint32_t column;
+    tokenStream_.srcCoords.lineNumAndColumnIndex(node->pn_pos.begin, &line, &column);
+
     Rooted<ExportEntryObject*> exportEntry(cx_);
-    exportEntry = ExportEntryObject::create(cx_, exportName, moduleRequest, importName, nullptr);
+    exportEntry = ExportEntryObject::create(cx_, exportName, moduleRequest, importName, nullptr,
+                                            line, column);
     return exportEntry && exportEntries_.append(exportEntry);
 }
 
diff --git a/js/src/builtin/ModuleObject.h b/js/src/builtin/ModuleObject.h
index 365fcd4bf..be0315215 100644
--- a/js/src/builtin/ModuleObject.h
+++ b/js/src/builtin/ModuleObject.h
@@ -24,6 +24,7 @@ class ModuleObject;
 
 namespace frontend {
 class ParseNode;
+class TokenStream;
 } /* namespace frontend */
 
 typedef Rooted<ModuleObject*> RootedModuleObject;
@@ -39,6 +40,8 @@ class ImportEntryObject : public NativeObject
         ModuleRequestSlot = 0,
         ImportNameSlot,
         LocalNameSlot,
+        LineNumberSlot,
+        ColumnNumberSlot,
         SlotCount
     };
 
@@ -48,10 +51,14 @@ class ImportEntryObject : public NativeObject
     static ImportEntryObject* create(ExclusiveContext* cx,
                                      HandleAtom moduleRequest,
                                      HandleAtom importName,
-                                     HandleAtom localName);
+                                     HandleAtom localName,
+                                     uint32_t lineNumber,
+                                     uint32_t columnNumber);
     JSAtom* moduleRequest() const;
     JSAtom* importName() const;
     JSAtom* localName() const;
+    uint32_t lineNumber() const;
+    uint32_t columnNumber() const;
 };
 
 typedef Rooted<ImportEntryObject*> RootedImportEntryObject;
@@ -66,6 +73,8 @@ class ExportEntryObject : public NativeObject
         ModuleRequestSlot,
         ImportNameSlot,
         LocalNameSlot,
+        LineNumberSlot,
+        ColumnNumberSlot,
         SlotCount
     };
 
@@ -76,11 +85,15 @@ class ExportEntryObject : public NativeObject
                                      HandleAtom maybeExportName,
                                      HandleAtom maybeModuleRequest,
                                      HandleAtom maybeImportName,
-                                     HandleAtom maybeLocalName);
+                                     HandleAtom maybeLocalName,
+                                     uint32_t lineNumber,
+                                     uint32_t columnNumber);
     JSAtom* exportName() const;
     JSAtom* moduleRequest() const;
     JSAtom* importName() const;
     JSAtom* localName() const;
+    uint32_t lineNumber() const;
+    uint32_t columnNumber() const;
 };
 
 typedef Rooted<ExportEntryObject*> RootedExportEntryObject;
@@ -304,7 +317,8 @@ class ModuleObject : public NativeObject
 class MOZ_STACK_CLASS ModuleBuilder
 {
   public:
-    explicit ModuleBuilder(ExclusiveContext* cx, HandleModuleObject module);
+    explicit ModuleBuilder(ExclusiveContext* cx, HandleModuleObject module,
+                           const frontend::TokenStream& tokenStream);
 
     bool processImport(frontend::ParseNode* pn);
     bool processExport(frontend::ParseNode* pn);
@@ -329,6 +343,7 @@ class MOZ_STACK_CLASS ModuleBuilder
 
     ExclusiveContext* cx_;
     RootedModuleObject module_;
+    const frontend::TokenStream& tokenStream_;
     RootedAtomVector requestedModules_;
     RootedAtomVector importedBoundNames_;
     RootedImportEntryVector importEntries_;
@@ -339,9 +354,10 @@ class MOZ_STACK_CLASS ModuleBuilder
 
     ImportEntryObject* importEntryFor(JSAtom* localName) const;
 
-    bool appendExportEntry(HandleAtom exportName, HandleAtom localName);
+    bool appendExportEntry(HandleAtom exportName, HandleAtom localName,
+                           frontend::ParseNode* node = nullptr);
     bool appendExportFromEntry(HandleAtom exportName, HandleAtom moduleRequest,
-                               HandleAtom importName);
+                               HandleAtom importName, frontend::ParseNode* node);
 
     bool maybeAppendRequestedModule(HandleAtom module);
 
diff --git a/js/src/builtin/ReflectParse.cpp b/js/src/builtin/ReflectParse.cpp
index a8065d6d1..5cb81355f 100644
--- a/js/src/builtin/ReflectParse.cpp
+++ b/js/src/builtin/ReflectParse.cpp
@@ -3741,7 +3741,7 @@ reflect_parse(JSContext* cx, uint32_t argc, Value* vp)
         if (!module)
             return false;
 
-        ModuleBuilder builder(cx, module);
+        ModuleBuilder builder(cx, module, parser.tokenStream);
         ModuleSharedContext modulesc(cx, module, &cx->global()->emptyGlobalScope(), builder);
         pn = parser.moduleBody(&modulesc);
         if (!pn)
diff --git a/js/src/frontend/BytecodeCompiler.cpp b/js/src/frontend/BytecodeCompiler.cpp
index ccfe3cd2e..3c2bcc1ed 100644
--- a/js/src/frontend/BytecodeCompiler.cpp
+++ b/js/src/frontend/BytecodeCompiler.cpp
@@ -405,7 +405,7 @@ BytecodeCompiler::compileModule()
 
     module->init(script);
 
-    ModuleBuilder builder(cx, module);
+    ModuleBuilder builder(cx, module, parser->tokenStream);
     ModuleSharedContext modulesc(cx, module, enclosingScope, builder);
     ParseNode* pn = parser->moduleBody(&modulesc);
     if (!pn)
diff --git a/js/src/js.msg b/js/src/js.msg
index ee74c8dd5..9c508ebbd 100644
--- a/js/src/js.msg
+++ b/js/src/js.msg
@@ -573,10 +573,10 @@ MSG_DEF(JSMSG_REINIT_THIS,       0, JSEXN_REFERENCEERR, "super() called twice in
 
 // Modules
 MSG_DEF(JSMSG_BAD_DEFAULT_EXPORT,        0, JSEXN_SYNTAXERR, "default export cannot be provided by export *")
-MSG_DEF(JSMSG_MISSING_INDIRECT_EXPORT,   1, JSEXN_SYNTAXERR, "indirect export '{0}' not found")
-MSG_DEF(JSMSG_AMBIGUOUS_INDIRECT_EXPORT, 1, JSEXN_SYNTAXERR, "ambiguous indirect export '{0}'")
-MSG_DEF(JSMSG_MISSING_IMPORT,            1, JSEXN_SYNTAXERR, "import '{0}' not found")
-MSG_DEF(JSMSG_AMBIGUOUS_IMPORT,          1, JSEXN_SYNTAXERR, "ambiguous import '{0}'")
+MSG_DEF(JSMSG_MISSING_INDIRECT_EXPORT,   0, JSEXN_SYNTAXERR, "indirect export not found")
+MSG_DEF(JSMSG_AMBIGUOUS_INDIRECT_EXPORT, 0, JSEXN_SYNTAXERR, "ambiguous indirect export")
+MSG_DEF(JSMSG_MISSING_IMPORT,            0, JSEXN_SYNTAXERR, "import not found")
+MSG_DEF(JSMSG_AMBIGUOUS_IMPORT,          0, JSEXN_SYNTAXERR, "ambiguous import")
 MSG_DEF(JSMSG_MISSING_NAMESPACE_EXPORT,  0, JSEXN_SYNTAXERR, "export not found for namespace")
 MSG_DEF(JSMSG_MISSING_EXPORT,            1, JSEXN_SYNTAXERR, "local binding for export '{0}' not found")
 MSG_DEF(JSMSG_MODULE_INSTANTIATE_FAILED, 0, JSEXN_INTERNALERR, "attempt to re-instantiate module after failure")
diff --git a/js/src/vm/SelfHosting.cpp b/js/src/vm/SelfHosting.cpp
index 89750d61a..0dfeffc36 100644
--- a/js/src/vm/SelfHosting.cpp
+++ b/js/src/vm/SelfHosting.cpp
@@ -345,6 +345,50 @@ intrinsic_ThrowInternalError(JSContext* cx, unsigned argc, Value* vp)
     return false;
 }
 
+static bool
+intrinsic_GetErrorMessage(JSContext* cx, unsigned argc, Value* vp)
+{
+    CallArgs args = CallArgsFromVp(argc, vp);
+    MOZ_ASSERT(args.length() == 1);
+    MOZ_ASSERT(args[0].isInt32());
+
+    const JSErrorFormatString* errorString = GetErrorMessage(nullptr, args[0].toInt32());
+    MOZ_ASSERT(errorString);
+
+    MOZ_ASSERT(errorString->argCount == 0);
+    RootedString message(cx, JS_NewStringCopyZ(cx, errorString->format));
+    if (!message)
+        return false;
+
+    args.rval().setString(message);
+    return true;
+}
+
+static bool
+intrinsic_CreateModuleSyntaxError(JSContext* cx, unsigned argc, Value* vp)
+{
+    CallArgs args = CallArgsFromVp(argc, vp);
+    MOZ_ASSERT(args.length() == 4);
+    MOZ_ASSERT(args[0].isObject());
+    MOZ_ASSERT(args[1].isInt32());
+    MOZ_ASSERT(args[2].isInt32());
+    MOZ_ASSERT(args[3].isString());
+
+    RootedModuleObject module(cx, &args[0].toObject().as<ModuleObject>());
+    RootedString filename(cx, JS_NewStringCopyZ(cx, module->script()->filename()));
+    RootedString message(cx, args[3].toString());
+
+    RootedValue error(cx);
+    if (!JS::CreateError(cx, JSEXN_SYNTAXERR, nullptr, filename, args[1].toInt32(),
+                         args[2].toInt32(), nullptr, message, &error))
+    {
+        return false;
+    }
+
+    args.rval().set(error);
+    return true;
+}
+
 /**
  * Handles an assertion failure in self-hosted code just like an assertion
  * failure in C++ code. Information about the failure can be provided in args[0].
@@ -2339,6 +2383,8 @@ static const JSFunctionSpec intrinsic_functions[] = {
     JS_FN("ThrowTypeError",          intrinsic_ThrowTypeError,          4,0),
     JS_FN("ThrowSyntaxError",        intrinsic_ThrowSyntaxError,        4,0),
     JS_FN("ThrowInternalError",      intrinsic_ThrowInternalError,      4,0),
+    JS_FN("GetErrorMessage",         intrinsic_GetErrorMessage,         1,0),
+    JS_FN("CreateModuleSyntaxError", intrinsic_CreateModuleSyntaxError, 4,0),
     JS_FN("AssertionFailed",         intrinsic_AssertionFailed,         1,0),
     JS_FN("DumpMessage",             intrinsic_DumpMessage,             1,0),
     JS_FN("OwnPropertyKeys",         intrinsic_OwnPropertyKeys,         1,0),