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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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1150 var stackTraceLimit = $Error.stackTraceLimit; | 1150 var stackTraceLimit = $Error.stackTraceLimit; |
1151 if (!stackTraceLimit || !IS_NUMBER(stackTraceLimit)) return; | 1151 if (!stackTraceLimit || !IS_NUMBER(stackTraceLimit)) return; |
1152 if (stackTraceLimit < 0 || stackTraceLimit > 10000) { | 1152 if (stackTraceLimit < 0 || stackTraceLimit > 10000) { |
1153 stackTraceLimit = 10000; | 1153 stackTraceLimit = 10000; |
1154 } | 1154 } |
1155 var stack = %CollectStackTrace(obj, | 1155 var stack = %CollectStackTrace(obj, |
1156 cons_opt ? cons_opt : captureStackTrace, | 1156 cons_opt ? cons_opt : captureStackTrace, |
1157 stackTraceLimit); | 1157 stackTraceLimit); |
1158 | 1158 |
1159 var error_string = FormatErrorString(obj); | 1159 var error_string = FormatErrorString(obj); |
1160 // The holder of this getter ('obj') may not be the receiver ('this'). | |
1161 // When this getter is called the first time, we use the context values to | |
1162 // format a stack trace string and turn this accessor pair into a data | |
1163 // property (on the holder). | |
1164 var getter = function() { | |
1165 // Stack is still a raw array awaiting to be formatted. | |
1166 var result = FormatStackTrace(obj, error_string, GetStackFrames(stack)); | |
1167 // Turn this accessor into a data property. | |
1168 %DefineOrRedefineDataProperty(obj, 'stack', result, NONE); | |
1169 // Release context values. | |
1170 stack = error_string = UNDEFINED; | |
1171 return result; | |
1172 }; | |
1173 | 1160 |
1174 // Set the 'stack' property on the receiver. If the receiver is the same as | 1161 // Set the 'stack' property on the receiver. If the receiver is the same as |
1175 // holder of this setter, the accessor pair is turned into a data property. | 1162 // holder of this setter, the accessor pair is turned into a data property. |
1176 var setter = function(v) { | 1163 var setter = function(v) { |
1177 // Set data property on the receiver (not necessarily holder). | 1164 // Set data property on the receiver (not necessarily holder). |
1178 %DefineOrRedefineDataProperty(this, 'stack', v, NONE); | 1165 %DefineOrRedefineDataProperty(this, 'stack', v, NONE); |
1179 if (this === obj) { | 1166 if (this === obj) { |
1180 // Release context values if holder is the same as the receiver. | 1167 // Release context values if holder is the same as the receiver. |
1181 stack = error_string = UNDEFINED; | 1168 stack = error_string = UNDEFINED; |
1182 } | 1169 } |
1183 }; | 1170 }; |
1184 | 1171 |
1172 // The holder of this getter ('obj') may not be the receiver ('this'). | |
1173 // When this getter is called the first time, we use the context values to | |
1174 // format a stack trace string and turn this accessor pair into a data | |
1175 // property (on the holder). | |
ulan
2014/04/28 12:01:26
The comment is outdated now.
| |
1176 var getter = function() { | |
1177 // Stack is still a raw array awaiting to be formatted. | |
1178 var result = FormatStackTrace(obj, error_string, GetStackFrames(stack)); | |
1179 // Replace this accessor to return result directly. | |
1180 %DefineOrRedefineAccessorProperty( | |
1181 obj, 'stack', function() { return result }, setter, DONT_ENUM); | |
1182 // Release context values. | |
1183 stack = error_string = UNDEFINED; | |
1184 return result; | |
1185 }; | |
1186 | |
1185 %DefineOrRedefineAccessorProperty(obj, 'stack', getter, setter, DONT_ENUM); | 1187 %DefineOrRedefineAccessorProperty(obj, 'stack', getter, setter, DONT_ENUM); |
1186 } | 1188 } |
1187 | 1189 |
1188 | 1190 |
1189 function SetUpError() { | 1191 function SetUpError() { |
1190 // Define special error type constructors. | 1192 // Define special error type constructors. |
1191 | 1193 |
1192 var DefineError = function(f) { | 1194 var DefineError = function(f) { |
1193 // Store the error function in both the global object | 1195 // Store the error function in both the global object |
1194 // and the runtime object. The function is fetched | 1196 // and the runtime object. The function is fetched |
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1313 | 1315 |
1314 InstallFunctions($Error.prototype, DONT_ENUM, ['toString', ErrorToString]); | 1316 InstallFunctions($Error.prototype, DONT_ENUM, ['toString', ErrorToString]); |
1315 | 1317 |
1316 // Boilerplate for exceptions for stack overflows. Used from | 1318 // Boilerplate for exceptions for stack overflows. Used from |
1317 // Isolate::StackOverflow(). | 1319 // Isolate::StackOverflow(). |
1318 function SetUpStackOverflowBoilerplate() { | 1320 function SetUpStackOverflowBoilerplate() { |
1319 var boilerplate = MakeRangeError('stack_overflow', []); | 1321 var boilerplate = MakeRangeError('stack_overflow', []); |
1320 | 1322 |
1321 var error_string = boilerplate.name + ": " + boilerplate.message; | 1323 var error_string = boilerplate.name + ": " + boilerplate.message; |
1322 | 1324 |
1325 // Set the 'stack' property on the receiver. If the receiver is the same as | |
1326 // holder of this setter, the accessor pair is turned into a data property. | |
1327 var setter = function(v) { | |
1328 %DefineOrRedefineDataProperty(this, 'stack', v, NONE); | |
1329 // Tentatively clear the hidden property. If the receiver is the same as | |
1330 // holder, we release the raw stack trace this way. | |
1331 %GetAndClearOverflowedStackTrace(this); | |
1332 }; | |
1333 | |
1323 // The raw stack trace is stored as a hidden property on the holder of this | 1334 // The raw stack trace is stored as a hidden property on the holder of this |
1324 // getter, which may not be the same as the receiver. Find the holder to | 1335 // getter, which may not be the same as the receiver. Find the holder to |
1325 // retrieve the raw stack trace and then turn this accessor pair into a | 1336 // retrieve the raw stack trace and then turn this accessor pair into a |
1326 // data property. | 1337 // data property. |
1327 var getter = function() { | 1338 var getter = function() { |
1328 var holder = this; | 1339 var holder = this; |
1329 while (!IS_ERROR(holder)) { | 1340 while (!IS_ERROR(holder)) { |
1330 holder = %GetPrototype(holder); | 1341 holder = %GetPrototype(holder); |
1331 if (IS_NULL(holder)) return MakeSyntaxError('illegal_access', []); | 1342 if (IS_NULL(holder)) return MakeSyntaxError('illegal_access', []); |
1332 } | 1343 } |
1333 var stack = %GetAndClearOverflowedStackTrace(holder); | 1344 var stack = %GetAndClearOverflowedStackTrace(holder); |
1334 // We may not have captured any stack trace. | 1345 // We may not have captured any stack trace. |
1335 if (IS_UNDEFINED(stack)) return stack; | 1346 if (IS_UNDEFINED(stack)) return stack; |
1336 | 1347 |
1337 var result = FormatStackTrace(holder, error_string, GetStackFrames(stack)); | 1348 var result = FormatStackTrace(holder, error_string, GetStackFrames(stack)); |
1338 // Replace this accessor with a data property. | 1349 // Replace this accessor to return result directly. |
1339 %DefineOrRedefineDataProperty(holder, 'stack', result, NONE); | 1350 %DefineOrRedefineAccessorProperty( |
1351 holder, 'stack', function() { return result }, setter, DONT_ENUM); | |
1340 return result; | 1352 return result; |
1341 }; | 1353 }; |
1342 | 1354 |
1343 // Set the 'stack' property on the receiver. If the receiver is the same as | |
1344 // holder of this setter, the accessor pair is turned into a data property. | |
1345 var setter = function(v) { | |
1346 %DefineOrRedefineDataProperty(this, 'stack', v, NONE); | |
1347 // Tentatively clear the hidden property. If the receiver is the same as | |
1348 // holder, we release the raw stack trace this way. | |
1349 %GetAndClearOverflowedStackTrace(this); | |
1350 }; | |
1351 | |
1352 %DefineOrRedefineAccessorProperty( | 1355 %DefineOrRedefineAccessorProperty( |
1353 boilerplate, 'stack', getter, setter, DONT_ENUM); | 1356 boilerplate, 'stack', getter, setter, DONT_ENUM); |
1354 | 1357 |
1355 return boilerplate; | 1358 return boilerplate; |
1356 } | 1359 } |
1357 | 1360 |
1358 var kStackOverflowBoilerplate = SetUpStackOverflowBoilerplate(); | 1361 var kStackOverflowBoilerplate = SetUpStackOverflowBoilerplate(); |
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