Mercurial > spidermonkey-playground

annotate spidermonkey-playground.cpp @ 70:f6e3733eac01

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Refactored some code, fixed some TODOs.
author Atul Varma <varmaa@toolness.com>
date Thu, 25 Jun 2009 18:11:01 -0700
parents be61430630ab
children b87b6ebb6e86
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1 /* ***** BEGIN LICENSE BLOCK *****
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2 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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3 *
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4 * The contents of this file are subject to the Mozilla Public License Version
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5 * 1.1 (the "License"); you may not use this file except in compliance with
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6 * the License. You may obtain a copy of the License at
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7 * http://www.mozilla.org/MPL/
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8 *
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9 * Software distributed under the License is distributed on an "AS IS" basis,
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10 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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11 * for the specific language governing rights and limitations under the
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12 * License.
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13 *
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14 * The Original Code is Ubiquity.
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15 *
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16 * The Initial Developer of the Original Code is Mozilla.
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17 * Portions created by the Initial Developer are Copyright (C) 2007
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18 * the Initial Developer. All Rights Reserved.
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19 *
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20 * Contributor(s):
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21 * Atul Varma <atul@mozilla.com>
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22 *
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23 * Alternatively, the contents of this file may be used under the terms of
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24 * either the GNU General Public License Version 2 or later (the "GPL"), or
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25 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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26 * in which case the provisions of the GPL or the LGPL are applicable instead
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27 * of those above. If you wish to allow use of your version of this file only
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28 * under the terms of either the GPL or the LGPL, and not to allow others to
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29 * use your version of this file under the terms of the MPL, indicate your
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30 * decision by deleting the provisions above and replace them with the notice
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31 * and other provisions required by the GPL or the LGPL. If you do not delete
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32 * the provisions above, a recipient may use your version of this file under
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33 * the terms of any one of the MPL, the GPL or the LGPL.
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34 *
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35 * ***** END LICENSE BLOCK ***** */
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36
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37 // This file is based on the code in the JSAPI User Guide:
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38 //
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39 // https://developer.mozilla.org/En/SpiderMonkey/JSAPI_User_Guide
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40
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41 #include "string.h"
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42 #include "jsapi.h"
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43 #include "jsdbgapi.h"
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45 #include "tcb.h"
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46 #include "wrapper.h"
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47 #include "server_socket.h"
50
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48 #include "memory_profiler.h"
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49
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50 // The name of our JS script containing our Trusted Code Base (TCB).
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51 #define TCB_FILENAME "tcb.js"
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52
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53 // Global references to our TCB.
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54 static JSContext *tcb_cx;
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55 static JSObject *tcb_global;
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56
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57 // The class of SecurableModules.
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58 static JSClass SM_global_class = {
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59 "SecurableModuleGlobal", JSCLASS_GLOBAL_FLAGS,
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60 JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
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61 JS_EnumerateStub, JS_ResolveStub, JS_ConvertStub, JS_FinalizeStub,
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62 JSCLASS_NO_OPTIONAL_MEMBERS
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63 };
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64
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65 // This native JS function is an implementation of the SecurableModule
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66 // require() function. For more information, see:
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67 //
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68 // https://wiki.mozilla.org/ServerJS/Modules/SecurableModules
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69 //
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70 // The function takes two parameters: a filename to import, and a JS
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71 // object containing objects to export into the module. The latter is
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72 // accessible from the loaded module via a global called 'imports'.
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73 //
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74 // This function returns the SecurableModule's 'exports' global.
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75
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76 static JSBool require(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
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77 jsval *rval)
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78 {
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79 char *filename;
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80 JSObject *exports;
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81
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82 if (!JS_ConvertArguments(cx, argc, argv, "so", &filename, &exports))
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83 return JS_FALSE;
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84
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85 FILE *f = fopen(filename, "r");
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86 if (!f) {
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87 JS_ReportError(cx, "File not found");
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88 return JS_FALSE;
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89 }
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90
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91 fseek(f, 0, SEEK_END);
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92 long fileSize = ftell(f);
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93 fseek(f, 0, SEEK_SET);
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94
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95 char source[fileSize];
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96 fread(source, fileSize, 1, f);
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97 fclose(f);
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98
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99 // TODO: Check for return values here.
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100 JSContext *module_cx = JS_NewContext(JS_GetRuntime(cx), 8192);
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101 JS_BeginRequest(module_cx);
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102 JSObject *module_global = JS_NewObject(module_cx,
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103 &SM_global_class, NULL,
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104 NULL);
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105 JS_InitStandardClasses(module_cx, module_global);
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106 JS_DefineProperty(module_cx, module_global, "imports",
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107 OBJECT_TO_JSVAL(exports), NULL, NULL, 0);
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108 JSObject *module_exports = JS_NewObject(module_cx, NULL, NULL,
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109 module_global);
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110 JS_DefineProperty(module_cx, module_global, "exports",
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111 OBJECT_TO_JSVAL(module_exports), NULL, NULL, 0);
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112
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113 jsval module_rval;
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114 if (!JS_EvaluateScript(module_cx, module_global, source,
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115 strlen(source), filename, 1, &module_rval)) {
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116 JS_EndRequest(module_cx);
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117 JS_DestroyContext(module_cx);
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118 return JS_FALSE;
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119 }
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120
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121 *rval = OBJECT_TO_JSVAL(module_exports);
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122
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123 JS_EndRequest(module_cx);
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124 JS_DestroyContext(module_cx);
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125
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126 return JS_TRUE;
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127 }
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128
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129 // Our global checkAccess callback just checks to see if a JS function called
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130 // 'checkAccess' has been defined in the TCB, and delegates to that if so. If
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131 // not, though, we do a default checkAccess.
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132
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133 static JSBool checkAccess(JSContext *cx, JSObject *obj, jsval id,
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134 JSAccessMode mode, jsval *vp)
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135 {
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136 jsval checkAccess;
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137 if (tcb_global && JS_GetProperty(tcb_cx, tcb_global, "checkAccess",
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138 &checkAccess) &&
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139 JSVAL_IS_OBJECT(checkAccess) &&
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140 JS_ObjectIsFunction(tcb_cx, JSVAL_TO_OBJECT(checkAccess))) {
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141 jsval argv[2];
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142 argv[0] = OBJECT_TO_JSVAL(obj);
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143 argv[1] = id;
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144 return JS_CallFunctionValue(tcb_cx, tcb_global, checkAccess, 2, argv,
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145 vp);
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146 }
10
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147
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148 // TODO: This doesn't work for the 'caller' attribute, and possibly other
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149 // things too.
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150 return JS_LookupPropertyById(cx, obj, id, vp);
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151 }
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152
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153 static JSFunctionSpec tcb_global_functions[] = {
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154 JS_FS("getWrapper", getWrapper, 1, 0, 0),
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155 JS_FS("unwrap", unwrapObject, 1, 0, 0),
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156 JS_FS("wrap", wrapObject, 2, 0, 0),
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157 JS_FS("require", require, 2, 0, 0),
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158 JS_FS("profileMemory", profileMemory, 0, 0, 0),
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159 JS_FS("ServerSocket", createServerSocket, 0, 0, 0),
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160 JS_FS_END
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161 };
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162
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163 static JSSecurityCallbacks securityCallbacks = {
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164 checkAccess,
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165 NULL,
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166 NULL
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167 };
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168
0
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169 int main(int argc, const char *argv[])
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170 {
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171 /* JS variables. */
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172 JSRuntime *rt;
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173
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174 /* Create a JS runtime. */
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175 rt = JS_NewRuntime(8L * 1024L * 1024L);
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176 if (rt == NULL)
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177 return 1;
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178
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179 JS_SetRuntimeSecurityCallbacks(rt, &securityCallbacks);
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180
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181 /* Create a context. */
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182 tcb_cx = JS_NewContext(rt, 8192);
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183 if (tcb_cx == NULL)
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184 return 1;
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185 JS_SetOptions(tcb_cx, JSOPTION_VAROBJFIX);
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186 JS_SetVersion(tcb_cx, JSVERSION_LATEST);
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187
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188 JS_BeginRequest(tcb_cx);
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189
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190 jsval rval;
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191
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192 if (!TCB_init(tcb_cx, &rval))
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193 return 1;
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194 tcb_global = JSVAL_TO_OBJECT(rval);
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195
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196 JS_AddNamedRoot(tcb_cx, &tcb_global, "TCB Global");
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197
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198 if (!JS_DefineFunctions(tcb_cx, tcb_global, tcb_global_functions))
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199 return 1;
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200
2
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201 FILE *f = fopen(TCB_FILENAME, "r");
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202 if (!f)
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203 return 1;
39
067371eb9601 The playground now only allocates buffers the size of the JS files being loaded, rather than 100k ones.
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204
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205 fseek(f, 0, SEEK_END);
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206 long fileSize = ftell(f);
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207 fseek(f, 0, SEEK_SET);
2
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208
39
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209 char source[fileSize];
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210 fread(source, fileSize, 1, f);
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211 fclose(f);
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212
3
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213 if (!JS_EvaluateScript(tcb_cx, tcb_global, source,
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214 fileSize, TCB_FILENAME, 1,
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215 &rval)) {
8
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216 jsval handleError;
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217 if (JS_GetProperty(tcb_cx, tcb_global, "handleError", &handleError) &&
e14f496e6e08 added a handleError() function to the TCB, which is called whenever an unhandled exception occurs. Also fixed a bug in the setting of lastException.
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218 JSVAL_IS_OBJECT(handleError) &&
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219 JS_ObjectIsFunction(tcb_cx, JSVAL_TO_OBJECT(handleError))) {
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220 JS_CallFunctionValue(tcb_cx, tcb_global, handleError, 0, NULL, &rval);
e14f496e6e08 added a handleError() function to the TCB, which is called whenever an unhandled exception occurs. Also fixed a bug in the setting of lastException.
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221 }
1
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222 return 1;
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223 }
0
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224
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225 /* Cleanup. */
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226 JS_RemoveRoot(tcb_cx, &tcb_global);
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diff changeset
227 JS_EndRequest(tcb_cx);
3
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228 JS_DestroyContext(tcb_cx);
0
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229 JS_DestroyRuntime(rt);
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230 JS_ShutDown();
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231
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232 printf("Farewell.\n");
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233 return 0;
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234 }