1// Copyright 2015 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5(function(global, utils, extrasUtils) {
6
7"use strict";
8
9%CheckIsBootstrapping();
10
11// -----------------------------------------------------------------------
12// Utils
13
14var imports = UNDEFINED;
15var imports_from_experimental = UNDEFINED;
16var exports_container = %ExportFromRuntime({});
17var typed_array_setup = UNDEFINED;
18
19// Register context value to be initialized with a typed array in
20// Genesis::InitializeBuiltinTypedArrays.
21function SetupTypedArray(f) {
22  f.next = typed_array_setup;
23  typed_array_setup = f;
24}
25
26// Export to other scripts.
27// In normal natives, this exports functions to other normal natives.
28// In experimental natives, this exports to other experimental natives and
29// to normal natives that import using utils.ImportFromExperimental.
30function Export(f) {
31  f(exports_container);
32}
33
34
35// Import from other scripts. The actual importing happens in PostNatives and
36// PostExperimental so that we can import from scripts executed later. However,
37// that means that the import is not available until the very end. If the
38// import needs to be available immediate, use ImportNow.
39// In normal natives, this imports from other normal natives.
40// In experimental natives, this imports from other experimental natives and
41// whitelisted exports from normal natives.
42function Import(f) {
43  f.next = imports;
44  imports = f;
45}
46
47
48// Import immediately from exports of previous scripts. We need this for
49// functions called during bootstrapping. Hooking up imports in PostNatives
50// would be too late.
51function ImportNow(name) {
52  return exports_container[name];
53}
54
55
56// In normal natives, import from experimental natives.
57// Not callable from experimental natives.
58function ImportFromExperimental(f) {
59  f.next = imports_from_experimental;
60  imports_from_experimental = f;
61}
62
63
64function SetFunctionName(f, name, prefix) {
65  if (IS_SYMBOL(name)) {
66    name = "[" + %SymbolDescription(name) + "]";
67  }
68  if (IS_UNDEFINED(prefix)) {
69    %FunctionSetName(f, name);
70  } else {
71    %FunctionSetName(f, prefix + " " + name);
72  }
73}
74
75
76function InstallConstants(object, constants) {
77  %CheckIsBootstrapping();
78  %OptimizeObjectForAddingMultipleProperties(object, constants.length >> 1);
79  var attributes = DONT_ENUM | DONT_DELETE | READ_ONLY;
80  for (var i = 0; i < constants.length; i += 2) {
81    var name = constants[i];
82    var k = constants[i + 1];
83    %AddNamedProperty(object, name, k, attributes);
84  }
85  %ToFastProperties(object);
86}
87
88
89function InstallFunctions(object, attributes, functions) {
90  %CheckIsBootstrapping();
91  %OptimizeObjectForAddingMultipleProperties(object, functions.length >> 1);
92  for (var i = 0; i < functions.length; i += 2) {
93    var key = functions[i];
94    var f = functions[i + 1];
95    SetFunctionName(f, key);
96    %FunctionRemovePrototype(f);
97    %AddNamedProperty(object, key, f, attributes);
98    %SetNativeFlag(f);
99  }
100  %ToFastProperties(object);
101}
102
103
104// Helper function to install a getter-only accessor property.
105function InstallGetter(object, name, getter, attributes, prefix) {
106  %CheckIsBootstrapping();
107  if (IS_UNDEFINED(attributes)) attributes = DONT_ENUM;
108  SetFunctionName(getter, name, IS_UNDEFINED(prefix) ? "get" : prefix);
109  %FunctionRemovePrototype(getter);
110  %DefineGetterPropertyUnchecked(object, name, getter, attributes);
111  %SetNativeFlag(getter);
112}
113
114
115function OverrideFunction(object, name, f, afterInitialBootstrap) {
116  %CheckIsBootstrapping();
117  %object_define_property(object, name, { value: f,
118                                          writeable: true,
119                                          configurable: true,
120                                          enumerable: false });
121  SetFunctionName(f, name);
122  if (!afterInitialBootstrap) %FunctionRemovePrototype(f);
123  %SetNativeFlag(f);
124}
125
126
127// Prevents changes to the prototype of a built-in function.
128// The "prototype" property of the function object is made non-configurable,
129// and the prototype object is made non-extensible. The latter prevents
130// changing the __proto__ property.
131function SetUpLockedPrototype(
132    constructor, fields, methods) {
133  %CheckIsBootstrapping();
134  var prototype = constructor.prototype;
135  // Install functions first, because this function is used to initialize
136  // PropertyDescriptor itself.
137  var property_count = (methods.length >> 1) + (fields ? fields.length : 0);
138  if (property_count >= 4) {
139    %OptimizeObjectForAddingMultipleProperties(prototype, property_count);
140  }
141  if (fields) {
142    for (var i = 0; i < fields.length; i++) {
143      %AddNamedProperty(prototype, fields[i],
144                        UNDEFINED, DONT_ENUM | DONT_DELETE);
145    }
146  }
147  for (var i = 0; i < methods.length; i += 2) {
148    var key = methods[i];
149    var f = methods[i + 1];
150    %AddNamedProperty(prototype, key, f, DONT_ENUM | DONT_DELETE | READ_ONLY);
151    %SetNativeFlag(f);
152  }
153  %InternalSetPrototype(prototype, null);
154  %ToFastProperties(prototype);
155}
156
157
158// -----------------------------------------------------------------------
159// To be called by bootstrapper
160
161function PostNatives(utils) {
162  %CheckIsBootstrapping();
163
164  for ( ; !IS_UNDEFINED(imports); imports = imports.next) {
165    imports(exports_container);
166  }
167
168  // Whitelist of exports from normal natives to experimental natives and debug.
169  var expose_list = [
170    "FormatDateToParts",
171    "MapEntries",
172    "MapIteratorNext",
173    "MaxSimple",
174    "MinSimple",
175    "SetIteratorNext",
176    "SetValues",
177    "ToLocaleLowerCaseI18N",
178    "ToLocaleUpperCaseI18N",
179    "ToLowerCaseI18N",
180    "ToUpperCaseI18N",
181    // From runtime:
182    "promise_result_symbol",
183    "promise_state_symbol",
184    "reflect_apply",
185    "to_string_tag_symbol",
186  ];
187
188  var filtered_exports = {};
189  %OptimizeObjectForAddingMultipleProperties(
190      filtered_exports, expose_list.length);
191  for (var key of expose_list) {
192    filtered_exports[key] = exports_container[key];
193  }
194  %ToFastProperties(filtered_exports);
195  exports_container = filtered_exports;
196
197  utils.PostNatives = UNDEFINED;
198  utils.ImportFromExperimental = UNDEFINED;
199}
200
201
202function PostExperimentals(utils) {
203  %CheckIsBootstrapping();
204  for ( ; !IS_UNDEFINED(imports); imports = imports.next) {
205    imports(exports_container);
206  }
207  for ( ; !IS_UNDEFINED(imports_from_experimental);
208          imports_from_experimental = imports_from_experimental.next) {
209    imports_from_experimental(exports_container);
210  }
211
212  utils.Export = UNDEFINED;
213  utils.PostDebug = UNDEFINED;
214  utils.PostExperimentals = UNDEFINED;
215  typed_array_setup = UNDEFINED;
216}
217
218
219function PostDebug(utils) {
220  for ( ; !IS_UNDEFINED(imports); imports = imports.next) {
221    imports(exports_container);
222  }
223
224  exports_container = UNDEFINED;
225
226  utils.Export = UNDEFINED;
227  utils.Import = UNDEFINED;
228  utils.ImportNow = UNDEFINED;
229  utils.PostDebug = UNDEFINED;
230  utils.PostExperimentals = UNDEFINED;
231  typed_array_setup = UNDEFINED;
232}
233
234
235function InitializeBuiltinTypedArrays(utils, rng_state, rempio2result) {
236  var setup_list =  typed_array_setup;
237
238  for ( ; !IS_UNDEFINED(setup_list); setup_list = setup_list.next) {
239    setup_list(rng_state, rempio2result);
240  }
241}
242
243
244// -----------------------------------------------------------------------
245
246%OptimizeObjectForAddingMultipleProperties(utils, 14);
247
248utils.Import = Import;
249utils.ImportNow = ImportNow;
250utils.Export = Export;
251utils.ImportFromExperimental = ImportFromExperimental;
252utils.SetFunctionName = SetFunctionName;
253utils.InstallConstants = InstallConstants;
254utils.InstallFunctions = InstallFunctions;
255utils.InstallGetter = InstallGetter;
256utils.OverrideFunction = OverrideFunction;
257utils.SetUpLockedPrototype = SetUpLockedPrototype;
258utils.PostNatives = PostNatives;
259utils.PostExperimentals = PostExperimentals;
260utils.PostDebug = PostDebug;
261
262%ToFastProperties(utils);
263
264// -----------------------------------------------------------------------
265
266%OptimizeObjectForAddingMultipleProperties(extrasUtils, 7);
267
268extrasUtils.logStackTrace = function logStackTrace() {
269  %DebugTrace();
270};
271
272extrasUtils.log = function log() {
273  let message = '';
274  for (const arg of arguments) {
275    message += arg;
276  }
277
278  %GlobalPrint(message);
279};
280
281// Extras need the ability to store private state on their objects without
282// exposing it to the outside world.
283
284extrasUtils.createPrivateSymbol = function createPrivateSymbol(name) {
285  return %CreatePrivateSymbol(name);
286};
287
288// These functions are key for safe meta-programming:
289// http://wiki.ecmascript.org/doku.php?id=conventions:safe_meta_programming
290//
291// Technically they could all be derived from combinations of
292// Function.prototype.{bind,call,apply} but that introduces lots of layers of
293// indirection and slowness given how un-optimized bind is.
294
295extrasUtils.simpleBind = function simpleBind(func, thisArg) {
296  return function(...args) {
297    return %reflect_apply(func, thisArg, args);
298  };
299};
300
301extrasUtils.uncurryThis = function uncurryThis(func) {
302  return function(thisArg, ...args) {
303    return %reflect_apply(func, thisArg, args);
304  };
305};
306
307// We pass true to trigger the debugger's on exception handler.
308extrasUtils.rejectPromise = function rejectPromise(promise, reason) {
309  %promise_internal_reject(promise, reason, true);
310}
311
312extrasUtils.markPromiseAsHandled = function markPromiseAsHandled(promise) {
313  %PromiseMarkAsHandled(promise);
314};
315
316%ToFastProperties(extrasUtils);
317
318})
319