Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1 | // Copyright 2012 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 | // ------------------------------------------------------------------- |
| 6 | |
| 7 | (function(global, utils) { |
| 8 | |
| 9 | %CheckIsBootstrapping(); |
| 10 | |
| 11 | // ------------------------------------------------------------------- |
| 12 | // Imports |
| 13 | |
| 14 | var ArrayJoin; |
| 15 | var Bool16x8ToString; |
| 16 | var Bool32x4ToString; |
| 17 | var Bool8x16ToString; |
| 18 | var callSiteReceiverSymbol = |
| 19 | utils.ImportNow("call_site_receiver_symbol"); |
| 20 | var callSiteFunctionSymbol = |
| 21 | utils.ImportNow("call_site_function_symbol"); |
| 22 | var callSitePositionSymbol = |
| 23 | utils.ImportNow("call_site_position_symbol"); |
| 24 | var callSiteStrictSymbol = |
| 25 | utils.ImportNow("call_site_strict_symbol"); |
| 26 | var FLAG_harmony_tostring; |
| 27 | var Float32x4ToString; |
| 28 | var formattedStackTraceSymbol = |
| 29 | utils.ImportNow("formatted_stack_trace_symbol"); |
| 30 | var GlobalObject = global.Object; |
| 31 | var Int16x8ToString; |
| 32 | var Int32x4ToString; |
| 33 | var Int8x16ToString; |
| 34 | var InternalArray = utils.InternalArray; |
| 35 | var internalErrorSymbol = utils.ImportNow("internal_error_symbol"); |
| 36 | var ObjectDefineProperty; |
| 37 | var ObjectToString = utils.ImportNow("object_to_string"); |
| 38 | var Script = utils.ImportNow("Script"); |
| 39 | var stackTraceSymbol = utils.ImportNow("stack_trace_symbol"); |
| 40 | var StringCharAt; |
| 41 | var StringIndexOf; |
| 42 | var StringSubstring; |
| 43 | var SymbolToString; |
| 44 | var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol"); |
| 45 | var Uint16x8ToString; |
| 46 | var Uint32x4ToString; |
| 47 | var Uint8x16ToString; |
| 48 | |
| 49 | utils.Import(function(from) { |
| 50 | ArrayJoin = from.ArrayJoin; |
| 51 | Bool16x8ToString = from.Bool16x8ToString; |
| 52 | Bool32x4ToString = from.Bool32x4ToString; |
| 53 | Bool8x16ToString = from.Bool8x16ToString; |
| 54 | Float32x4ToString = from.Float32x4ToString; |
| 55 | Int16x8ToString = from.Int16x8ToString; |
| 56 | Int32x4ToString = from.Int32x4ToString; |
| 57 | Int8x16ToString = from.Int8x16ToString; |
| 58 | ObjectDefineProperty = from.ObjectDefineProperty; |
| 59 | StringCharAt = from.StringCharAt; |
| 60 | StringIndexOf = from.StringIndexOf; |
| 61 | StringSubstring = from.StringSubstring; |
| 62 | SymbolToString = from.SymbolToString; |
| 63 | Uint16x8ToString = from.Uint16x8ToString; |
| 64 | Uint32x4ToString = from.Uint32x4ToString; |
| 65 | Uint8x16ToString = from.Uint8x16ToString; |
| 66 | }); |
| 67 | |
| 68 | utils.ImportFromExperimental(function(from) { |
| 69 | FLAG_harmony_tostring = from.FLAG_harmony_tostring; |
| 70 | }); |
| 71 | |
| 72 | // ------------------------------------------------------------------- |
| 73 | |
| 74 | var GlobalError; |
| 75 | var GlobalTypeError; |
| 76 | var GlobalRangeError; |
| 77 | var GlobalURIError; |
| 78 | var GlobalSyntaxError; |
| 79 | var GlobalReferenceError; |
| 80 | var GlobalEvalError; |
| 81 | |
| 82 | |
| 83 | function NoSideEffectsObjectToString() { |
| 84 | if (IS_UNDEFINED(this)) return "[object Undefined]"; |
| 85 | if (IS_NULL(this)) return "[object Null]"; |
| 86 | var O = TO_OBJECT(this); |
| 87 | var builtinTag = %_ClassOf(O); |
| 88 | var tag; |
| 89 | if (FLAG_harmony_tostring) { |
| 90 | tag = %GetDataProperty(O, toStringTagSymbol); |
| 91 | if (!IS_STRING(tag)) { |
| 92 | tag = builtinTag; |
| 93 | } |
| 94 | } else { |
| 95 | tag = builtinTag; |
| 96 | } |
| 97 | return `[object ${tag}]`; |
| 98 | } |
| 99 | |
| 100 | function IsErrorObject(obj) { |
| 101 | return HAS_PRIVATE(obj, stackTraceSymbol); |
| 102 | } |
| 103 | |
| 104 | function NoSideEffectsErrorToString() { |
| 105 | var name = %GetDataProperty(this, "name"); |
| 106 | var message = %GetDataProperty(this, "message"); |
| 107 | name = IS_UNDEFINED(name) ? "Error" : NoSideEffectsToString(name); |
| 108 | message = IS_UNDEFINED(message) ? "" : NoSideEffectsToString(message); |
| 109 | if (name == "") return message; |
| 110 | if (message == "") return name; |
| 111 | return `${name}: ${message}`; |
| 112 | } |
| 113 | |
| 114 | function NoSideEffectsToString(obj) { |
| 115 | if (IS_STRING(obj)) return obj; |
| 116 | if (IS_NUMBER(obj)) return %_NumberToString(obj); |
| 117 | if (IS_BOOLEAN(obj)) return obj ? 'true' : 'false'; |
| 118 | if (IS_UNDEFINED(obj)) return 'undefined'; |
| 119 | if (IS_NULL(obj)) return 'null'; |
| 120 | if (IS_FUNCTION(obj)) { |
| 121 | var str = %FunctionToString(obj); |
| 122 | if (str.length > 128) { |
| 123 | str = %_SubString(str, 0, 111) + "...<omitted>..." + |
| 124 | %_SubString(str, str.length - 2, str.length); |
| 125 | } |
| 126 | return str; |
| 127 | } |
| 128 | if (IS_SYMBOL(obj)) return %_Call(SymbolToString, obj); |
| 129 | if (IS_SIMD_VALUE(obj)) { |
| 130 | switch (typeof(obj)) { |
| 131 | case 'float32x4': return %_Call(Float32x4ToString, obj); |
| 132 | case 'int32x4': return %_Call(Int32x4ToString, obj); |
| 133 | case 'int16x8': return %_Call(Int16x8ToString, obj); |
| 134 | case 'int8x16': return %_Call(Int8x16ToString, obj); |
| 135 | case 'uint32x4': return %_Call(Uint32x4ToString, obj); |
| 136 | case 'uint16x8': return %_Call(Uint16x8ToString, obj); |
| 137 | case 'uint8x16': return %_Call(Uint8x16ToString, obj); |
| 138 | case 'bool32x4': return %_Call(Bool32x4ToString, obj); |
| 139 | case 'bool16x8': return %_Call(Bool16x8ToString, obj); |
| 140 | case 'bool8x16': return %_Call(Bool8x16ToString, obj); |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | if (IS_RECEIVER(obj)) { |
| 145 | // When internally formatting error objects, use a side-effects-free version |
| 146 | // of Error.prototype.toString independent of the actually installed |
| 147 | // toString method. |
| 148 | if (IsErrorObject(obj) || |
| 149 | %GetDataProperty(obj, "toString") === ErrorToString) { |
| 150 | return %_Call(NoSideEffectsErrorToString, obj); |
| 151 | } |
| 152 | |
| 153 | if (%GetDataProperty(obj, "toString") === ObjectToString) { |
| 154 | var constructor = %GetDataProperty(obj, "constructor"); |
| 155 | if (IS_FUNCTION(constructor)) { |
| 156 | var constructor_name = %FunctionGetName(constructor); |
| 157 | if (constructor_name != "") return `#<${constructor_name}>`; |
| 158 | } |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | return %_Call(NoSideEffectsObjectToString, obj); |
| 163 | } |
| 164 | |
| 165 | |
| 166 | function MakeGenericError(constructor, type, arg0, arg1, arg2) { |
| 167 | var error = new constructor(FormatMessage(type, arg0, arg1, arg2)); |
| 168 | error[internalErrorSymbol] = true; |
| 169 | return error; |
| 170 | } |
| 171 | |
| 172 | |
| 173 | /** |
| 174 | * Set up the Script function and constructor. |
| 175 | */ |
| 176 | %FunctionSetInstanceClassName(Script, 'Script'); |
| 177 | %AddNamedProperty(Script.prototype, 'constructor', Script, |
| 178 | DONT_ENUM | DONT_DELETE | READ_ONLY); |
| 179 | %SetCode(Script, function(x) { |
| 180 | // Script objects can only be created by the VM. |
| 181 | throw MakeError(kUnsupported); |
| 182 | }); |
| 183 | |
| 184 | |
| 185 | // Helper functions; called from the runtime system. |
| 186 | function FormatMessage(type, arg0, arg1, arg2) { |
| 187 | var arg0 = NoSideEffectsToString(arg0); |
| 188 | var arg1 = NoSideEffectsToString(arg1); |
| 189 | var arg2 = NoSideEffectsToString(arg2); |
| 190 | try { |
| 191 | return %FormatMessageString(type, arg0, arg1, arg2); |
| 192 | } catch (e) { |
| 193 | return "<error>"; |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | |
| 198 | function GetLineNumber(message) { |
| 199 | var start_position = %MessageGetStartPosition(message); |
| 200 | if (start_position == -1) return kNoLineNumberInfo; |
| 201 | var script = %MessageGetScript(message); |
| 202 | var location = script.locationFromPosition(start_position, true); |
| 203 | if (location == null) return kNoLineNumberInfo; |
| 204 | return location.line + 1; |
| 205 | } |
| 206 | |
| 207 | |
| 208 | //Returns the offset of the given position within the containing line. |
| 209 | function GetColumnNumber(message) { |
| 210 | var script = %MessageGetScript(message); |
| 211 | var start_position = %MessageGetStartPosition(message); |
| 212 | var location = script.locationFromPosition(start_position, true); |
| 213 | if (location == null) return -1; |
| 214 | return location.column; |
| 215 | } |
| 216 | |
| 217 | |
| 218 | // Returns the source code line containing the given source |
| 219 | // position, or the empty string if the position is invalid. |
| 220 | function GetSourceLine(message) { |
| 221 | var script = %MessageGetScript(message); |
| 222 | var start_position = %MessageGetStartPosition(message); |
| 223 | var location = script.locationFromPosition(start_position, true); |
| 224 | if (location == null) return ""; |
| 225 | return location.sourceText(); |
| 226 | } |
| 227 | |
| 228 | |
| 229 | /** |
| 230 | * Find a line number given a specific source position. |
| 231 | * @param {number} position The source position. |
| 232 | * @return {number} 0 if input too small, -1 if input too large, |
| 233 | else the line number. |
| 234 | */ |
| 235 | function ScriptLineFromPosition(position) { |
| 236 | var lower = 0; |
| 237 | var upper = this.lineCount() - 1; |
| 238 | var line_ends = this.line_ends; |
| 239 | |
| 240 | // We'll never find invalid positions so bail right away. |
| 241 | if (position > line_ends[upper]) { |
| 242 | return -1; |
| 243 | } |
| 244 | |
| 245 | // This means we don't have to safe-guard indexing line_ends[i - 1]. |
| 246 | if (position <= line_ends[0]) { |
| 247 | return 0; |
| 248 | } |
| 249 | |
| 250 | // Binary search to find line # from position range. |
| 251 | while (upper >= 1) { |
| 252 | var i = (lower + upper) >> 1; |
| 253 | |
| 254 | if (position > line_ends[i]) { |
| 255 | lower = i + 1; |
| 256 | } else if (position <= line_ends[i - 1]) { |
| 257 | upper = i - 1; |
| 258 | } else { |
| 259 | return i; |
| 260 | } |
| 261 | } |
| 262 | |
| 263 | return -1; |
| 264 | } |
| 265 | |
| 266 | /** |
| 267 | * Get information on a specific source position. |
| 268 | * @param {number} position The source position |
| 269 | * @param {boolean} include_resource_offset Set to true to have the resource |
| 270 | * offset added to the location |
| 271 | * @return {SourceLocation} |
| 272 | * If line is negative or not in the source null is returned. |
| 273 | */ |
| 274 | function ScriptLocationFromPosition(position, |
| 275 | include_resource_offset) { |
| 276 | var line = this.lineFromPosition(position); |
| 277 | if (line == -1) return null; |
| 278 | |
| 279 | // Determine start, end and column. |
| 280 | var line_ends = this.line_ends; |
| 281 | var start = line == 0 ? 0 : line_ends[line - 1] + 1; |
| 282 | var end = line_ends[line]; |
| 283 | if (end > 0 && %_Call(StringCharAt, this.source, end - 1) == '\r') { |
| 284 | end--; |
| 285 | } |
| 286 | var column = position - start; |
| 287 | |
| 288 | // Adjust according to the offset within the resource. |
| 289 | if (include_resource_offset) { |
| 290 | line += this.line_offset; |
| 291 | if (line == this.line_offset) { |
| 292 | column += this.column_offset; |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | return new SourceLocation(this, position, line, column, start, end); |
| 297 | } |
| 298 | |
| 299 | |
| 300 | /** |
| 301 | * Get information on a specific source line and column possibly offset by a |
| 302 | * fixed source position. This function is used to find a source position from |
| 303 | * a line and column position. The fixed source position offset is typically |
| 304 | * used to find a source position in a function based on a line and column in |
| 305 | * the source for the function alone. The offset passed will then be the |
| 306 | * start position of the source for the function within the full script source. |
| 307 | * @param {number} opt_line The line within the source. Default value is 0 |
| 308 | * @param {number} opt_column The column in within the line. Default value is 0 |
| 309 | * @param {number} opt_offset_position The offset from the begining of the |
| 310 | * source from where the line and column calculation starts. |
| 311 | * Default value is 0 |
| 312 | * @return {SourceLocation} |
| 313 | * If line is negative or not in the source null is returned. |
| 314 | */ |
| 315 | function ScriptLocationFromLine(opt_line, opt_column, opt_offset_position) { |
| 316 | // Default is the first line in the script. Lines in the script is relative |
| 317 | // to the offset within the resource. |
| 318 | var line = 0; |
| 319 | if (!IS_UNDEFINED(opt_line)) { |
| 320 | line = opt_line - this.line_offset; |
| 321 | } |
| 322 | |
| 323 | // Default is first column. If on the first line add the offset within the |
| 324 | // resource. |
| 325 | var column = opt_column || 0; |
| 326 | if (line == 0) { |
| 327 | column -= this.column_offset; |
| 328 | } |
| 329 | |
| 330 | var offset_position = opt_offset_position || 0; |
| 331 | if (line < 0 || column < 0 || offset_position < 0) return null; |
| 332 | if (line == 0) { |
| 333 | return this.locationFromPosition(offset_position + column, false); |
| 334 | } else { |
| 335 | // Find the line where the offset position is located. |
| 336 | var offset_line = this.lineFromPosition(offset_position); |
| 337 | |
| 338 | if (offset_line == -1 || offset_line + line >= this.lineCount()) { |
| 339 | return null; |
| 340 | } |
| 341 | |
| 342 | return this.locationFromPosition( |
| 343 | this.line_ends[offset_line + line - 1] + 1 + column); // line > 0 here. |
| 344 | } |
| 345 | } |
| 346 | |
| 347 | |
| 348 | /** |
| 349 | * Get a slice of source code from the script. The boundaries for the slice is |
| 350 | * specified in lines. |
| 351 | * @param {number} opt_from_line The first line (zero bound) in the slice. |
| 352 | * Default is 0 |
| 353 | * @param {number} opt_to_column The last line (zero bound) in the slice (non |
| 354 | * inclusive). Default is the number of lines in the script |
| 355 | * @return {SourceSlice} The source slice or null of the parameters where |
| 356 | * invalid |
| 357 | */ |
| 358 | function ScriptSourceSlice(opt_from_line, opt_to_line) { |
| 359 | var from_line = IS_UNDEFINED(opt_from_line) ? this.line_offset |
| 360 | : opt_from_line; |
| 361 | var to_line = IS_UNDEFINED(opt_to_line) ? this.line_offset + this.lineCount() |
| 362 | : opt_to_line; |
| 363 | |
| 364 | // Adjust according to the offset within the resource. |
| 365 | from_line -= this.line_offset; |
| 366 | to_line -= this.line_offset; |
| 367 | if (from_line < 0) from_line = 0; |
| 368 | if (to_line > this.lineCount()) to_line = this.lineCount(); |
| 369 | |
| 370 | // Check parameters. |
| 371 | if (from_line >= this.lineCount() || |
| 372 | to_line < 0 || |
| 373 | from_line > to_line) { |
| 374 | return null; |
| 375 | } |
| 376 | |
| 377 | var line_ends = this.line_ends; |
| 378 | var from_position = from_line == 0 ? 0 : line_ends[from_line - 1] + 1; |
| 379 | var to_position = to_line == 0 ? 0 : line_ends[to_line - 1] + 1; |
| 380 | |
| 381 | // Return a source slice with line numbers re-adjusted to the resource. |
| 382 | return new SourceSlice(this, |
| 383 | from_line + this.line_offset, |
| 384 | to_line + this.line_offset, |
| 385 | from_position, to_position); |
| 386 | } |
| 387 | |
| 388 | |
| 389 | function ScriptSourceLine(opt_line) { |
| 390 | // Default is the first line in the script. Lines in the script are relative |
| 391 | // to the offset within the resource. |
| 392 | var line = 0; |
| 393 | if (!IS_UNDEFINED(opt_line)) { |
| 394 | line = opt_line - this.line_offset; |
| 395 | } |
| 396 | |
| 397 | // Check parameter. |
| 398 | if (line < 0 || this.lineCount() <= line) { |
| 399 | return null; |
| 400 | } |
| 401 | |
| 402 | // Return the source line. |
| 403 | var line_ends = this.line_ends; |
| 404 | var start = line == 0 ? 0 : line_ends[line - 1] + 1; |
| 405 | var end = line_ends[line]; |
| 406 | return %_Call(StringSubstring, this.source, start, end); |
| 407 | } |
| 408 | |
| 409 | |
| 410 | /** |
| 411 | * Returns the number of source lines. |
| 412 | * @return {number} |
| 413 | * Number of source lines. |
| 414 | */ |
| 415 | function ScriptLineCount() { |
| 416 | // Return number of source lines. |
| 417 | return this.line_ends.length; |
| 418 | } |
| 419 | |
| 420 | |
| 421 | /** |
| 422 | * Returns the position of the nth line end. |
| 423 | * @return {number} |
| 424 | * Zero-based position of the nth line end in the script. |
| 425 | */ |
| 426 | function ScriptLineEnd(n) { |
| 427 | return this.line_ends[n]; |
| 428 | } |
| 429 | |
| 430 | |
| 431 | /** |
| 432 | * If sourceURL comment is available returns sourceURL comment contents. |
| 433 | * Otherwise, script name is returned. See |
| 434 | * http://fbug.googlecode.com/svn/branches/firebug1.1/docs/ReleaseNotes_1.1.txt |
| 435 | * and Source Map Revision 3 proposal for details on using //# sourceURL and |
| 436 | * deprecated //@ sourceURL comment to identify scripts that don't have name. |
| 437 | * |
| 438 | * @return {?string} script name if present, value for //# sourceURL comment or |
| 439 | * deprecated //@ sourceURL comment otherwise. |
| 440 | */ |
| 441 | function ScriptNameOrSourceURL() { |
| 442 | if (this.source_url) return this.source_url; |
| 443 | return this.name; |
| 444 | } |
| 445 | |
| 446 | |
| 447 | utils.SetUpLockedPrototype(Script, [ |
| 448 | "source", |
| 449 | "name", |
| 450 | "source_url", |
| 451 | "source_mapping_url", |
| 452 | "line_ends", |
| 453 | "line_offset", |
| 454 | "column_offset" |
| 455 | ], [ |
| 456 | "lineFromPosition", ScriptLineFromPosition, |
| 457 | "locationFromPosition", ScriptLocationFromPosition, |
| 458 | "locationFromLine", ScriptLocationFromLine, |
| 459 | "sourceSlice", ScriptSourceSlice, |
| 460 | "sourceLine", ScriptSourceLine, |
| 461 | "lineCount", ScriptLineCount, |
| 462 | "nameOrSourceURL", ScriptNameOrSourceURL, |
| 463 | "lineEnd", ScriptLineEnd |
| 464 | ] |
| 465 | ); |
| 466 | |
| 467 | |
| 468 | /** |
| 469 | * Class for source location. A source location is a position within some |
| 470 | * source with the following properties: |
| 471 | * script : script object for the source |
| 472 | * line : source line number |
| 473 | * column : source column within the line |
| 474 | * position : position within the source |
| 475 | * start : position of start of source context (inclusive) |
| 476 | * end : position of end of source context (not inclusive) |
| 477 | * Source text for the source context is the character interval |
| 478 | * [start, end[. In most cases end will point to a newline character. |
| 479 | * It might point just past the final position of the source if the last |
| 480 | * source line does not end with a newline character. |
| 481 | * @param {Script} script The Script object for which this is a location |
| 482 | * @param {number} position Source position for the location |
| 483 | * @param {number} line The line number for the location |
| 484 | * @param {number} column The column within the line for the location |
| 485 | * @param {number} start Source position for start of source context |
| 486 | * @param {number} end Source position for end of source context |
| 487 | * @constructor |
| 488 | */ |
| 489 | function SourceLocation(script, position, line, column, start, end) { |
| 490 | this.script = script; |
| 491 | this.position = position; |
| 492 | this.line = line; |
| 493 | this.column = column; |
| 494 | this.start = start; |
| 495 | this.end = end; |
| 496 | } |
| 497 | |
| 498 | |
| 499 | /** |
| 500 | * Get the source text for a SourceLocation |
| 501 | * @return {String} |
| 502 | * Source text for this location. |
| 503 | */ |
| 504 | function SourceLocationSourceText() { |
| 505 | return %_Call(StringSubstring, this.script.source, this.start, this.end); |
| 506 | } |
| 507 | |
| 508 | |
| 509 | utils.SetUpLockedPrototype(SourceLocation, |
| 510 | ["script", "position", "line", "column", "start", "end"], |
| 511 | ["sourceText", SourceLocationSourceText] |
| 512 | ); |
| 513 | |
| 514 | |
| 515 | /** |
| 516 | * Class for a source slice. A source slice is a part of a script source with |
| 517 | * the following properties: |
| 518 | * script : script object for the source |
| 519 | * from_line : line number for the first line in the slice |
| 520 | * to_line : source line number for the last line in the slice |
| 521 | * from_position : position of the first character in the slice |
| 522 | * to_position : position of the last character in the slice |
| 523 | * The to_line and to_position are not included in the slice, that is the lines |
| 524 | * in the slice are [from_line, to_line[. Likewise the characters in the slice |
| 525 | * are [from_position, to_position[. |
| 526 | * @param {Script} script The Script object for the source slice |
| 527 | * @param {number} from_line |
| 528 | * @param {number} to_line |
| 529 | * @param {number} from_position |
| 530 | * @param {number} to_position |
| 531 | * @constructor |
| 532 | */ |
| 533 | function SourceSlice(script, from_line, to_line, from_position, to_position) { |
| 534 | this.script = script; |
| 535 | this.from_line = from_line; |
| 536 | this.to_line = to_line; |
| 537 | this.from_position = from_position; |
| 538 | this.to_position = to_position; |
| 539 | } |
| 540 | |
| 541 | /** |
| 542 | * Get the source text for a SourceSlice |
| 543 | * @return {String} Source text for this slice. The last line will include |
| 544 | * the line terminating characters (if any) |
| 545 | */ |
| 546 | function SourceSliceSourceText() { |
| 547 | return %_Call(StringSubstring, |
| 548 | this.script.source, |
| 549 | this.from_position, |
| 550 | this.to_position); |
| 551 | } |
| 552 | |
| 553 | utils.SetUpLockedPrototype(SourceSlice, |
| 554 | ["script", "from_line", "to_line", "from_position", "to_position"], |
| 555 | ["sourceText", SourceSliceSourceText] |
| 556 | ); |
| 557 | |
| 558 | |
| 559 | function GetStackTraceLine(recv, fun, pos, isGlobal) { |
| 560 | return new CallSite(recv, fun, pos, false).toString(); |
| 561 | } |
| 562 | |
| 563 | // ---------------------------------------------------------------------------- |
| 564 | // Error implementation |
| 565 | |
| 566 | function CallSite(receiver, fun, pos, strict_mode) { |
| 567 | if (!IS_FUNCTION(fun)) { |
| 568 | throw MakeTypeError(kCallSiteExpectsFunction, typeof fun); |
| 569 | } |
| 570 | |
| 571 | if (IS_UNDEFINED(new.target)) { |
| 572 | return new CallSite(receiver, fun, pos, strict_mode); |
| 573 | } |
| 574 | |
| 575 | SET_PRIVATE(this, callSiteReceiverSymbol, receiver); |
| 576 | SET_PRIVATE(this, callSiteFunctionSymbol, fun); |
| 577 | SET_PRIVATE(this, callSitePositionSymbol, TO_INT32(pos)); |
| 578 | SET_PRIVATE(this, callSiteStrictSymbol, TO_BOOLEAN(strict_mode)); |
| 579 | } |
| 580 | |
| 581 | function CallSiteGetThis() { |
| 582 | return GET_PRIVATE(this, callSiteStrictSymbol) |
| 583 | ? UNDEFINED : GET_PRIVATE(this, callSiteReceiverSymbol); |
| 584 | } |
| 585 | |
| 586 | function CallSiteGetFunction() { |
| 587 | return GET_PRIVATE(this, callSiteStrictSymbol) |
| 588 | ? UNDEFINED : GET_PRIVATE(this, callSiteFunctionSymbol); |
| 589 | } |
| 590 | |
| 591 | function CallSiteGetPosition() { |
| 592 | return GET_PRIVATE(this, callSitePositionSymbol); |
| 593 | } |
| 594 | |
| 595 | function CallSiteGetTypeName() { |
| 596 | return GetTypeName(GET_PRIVATE(this, callSiteReceiverSymbol), false); |
| 597 | } |
| 598 | |
| 599 | function CallSiteIsToplevel() { |
| 600 | return %CallSiteIsToplevelRT(this); |
| 601 | } |
| 602 | |
| 603 | function CallSiteIsEval() { |
| 604 | return %CallSiteIsEvalRT(this); |
| 605 | } |
| 606 | |
| 607 | function CallSiteGetEvalOrigin() { |
| 608 | var script = %FunctionGetScript(GET_PRIVATE(this, callSiteFunctionSymbol)); |
| 609 | return FormatEvalOrigin(script); |
| 610 | } |
| 611 | |
| 612 | function CallSiteGetScriptNameOrSourceURL() { |
| 613 | return %CallSiteGetScriptNameOrSourceUrlRT(this); |
| 614 | } |
| 615 | |
| 616 | function CallSiteGetFunctionName() { |
| 617 | // See if the function knows its own name |
| 618 | return %CallSiteGetFunctionNameRT(this); |
| 619 | } |
| 620 | |
| 621 | function CallSiteGetMethodName() { |
| 622 | // See if we can find a unique property on the receiver that holds |
| 623 | // this function. |
| 624 | return %CallSiteGetMethodNameRT(this); |
| 625 | } |
| 626 | |
| 627 | function CallSiteGetFileName() { |
| 628 | return %CallSiteGetFileNameRT(this); |
| 629 | } |
| 630 | |
| 631 | function CallSiteGetLineNumber() { |
| 632 | return %CallSiteGetLineNumberRT(this); |
| 633 | } |
| 634 | |
| 635 | function CallSiteGetColumnNumber() { |
| 636 | return %CallSiteGetColumnNumberRT(this); |
| 637 | } |
| 638 | |
| 639 | function CallSiteIsNative() { |
| 640 | return %CallSiteIsNativeRT(this); |
| 641 | } |
| 642 | |
| 643 | function CallSiteIsConstructor() { |
| 644 | return %CallSiteIsConstructorRT(this); |
| 645 | } |
| 646 | |
| 647 | function CallSiteToString() { |
| 648 | var fileName; |
| 649 | var fileLocation = ""; |
| 650 | if (this.isNative()) { |
| 651 | fileLocation = "native"; |
| 652 | } else { |
| 653 | fileName = this.getScriptNameOrSourceURL(); |
| 654 | if (!fileName && this.isEval()) { |
| 655 | fileLocation = this.getEvalOrigin(); |
| 656 | fileLocation += ", "; // Expecting source position to follow. |
| 657 | } |
| 658 | |
| 659 | if (fileName) { |
| 660 | fileLocation += fileName; |
| 661 | } else { |
| 662 | // Source code does not originate from a file and is not native, but we |
| 663 | // can still get the source position inside the source string, e.g. in |
| 664 | // an eval string. |
| 665 | fileLocation += "<anonymous>"; |
| 666 | } |
| 667 | var lineNumber = this.getLineNumber(); |
| 668 | if (lineNumber != null) { |
| 669 | fileLocation += ":" + lineNumber; |
| 670 | var columnNumber = this.getColumnNumber(); |
| 671 | if (columnNumber) { |
| 672 | fileLocation += ":" + columnNumber; |
| 673 | } |
| 674 | } |
| 675 | } |
| 676 | |
| 677 | var line = ""; |
| 678 | var functionName = this.getFunctionName(); |
| 679 | var addSuffix = true; |
| 680 | var isConstructor = this.isConstructor(); |
| 681 | var isMethodCall = !(this.isToplevel() || isConstructor); |
| 682 | if (isMethodCall) { |
| 683 | var typeName = GetTypeName(GET_PRIVATE(this, callSiteReceiverSymbol), true); |
| 684 | var methodName = this.getMethodName(); |
| 685 | if (functionName) { |
| 686 | if (typeName && %_Call(StringIndexOf, functionName, typeName) != 0) { |
| 687 | line += typeName + "."; |
| 688 | } |
| 689 | line += functionName; |
| 690 | if (methodName && |
| 691 | (%_Call(StringIndexOf, functionName, "." + methodName) != |
| 692 | functionName.length - methodName.length - 1)) { |
| 693 | line += " [as " + methodName + "]"; |
| 694 | } |
| 695 | } else { |
| 696 | line += typeName + "." + (methodName || "<anonymous>"); |
| 697 | } |
| 698 | } else if (isConstructor) { |
| 699 | line += "new " + (functionName || "<anonymous>"); |
| 700 | } else if (functionName) { |
| 701 | line += functionName; |
| 702 | } else { |
| 703 | line += fileLocation; |
| 704 | addSuffix = false; |
| 705 | } |
| 706 | if (addSuffix) { |
| 707 | line += " (" + fileLocation + ")"; |
| 708 | } |
| 709 | return line; |
| 710 | } |
| 711 | |
| 712 | utils.SetUpLockedPrototype(CallSite, ["receiver", "fun", "pos"], [ |
| 713 | "getThis", CallSiteGetThis, |
| 714 | "getTypeName", CallSiteGetTypeName, |
| 715 | "isToplevel", CallSiteIsToplevel, |
| 716 | "isEval", CallSiteIsEval, |
| 717 | "getEvalOrigin", CallSiteGetEvalOrigin, |
| 718 | "getScriptNameOrSourceURL", CallSiteGetScriptNameOrSourceURL, |
| 719 | "getFunction", CallSiteGetFunction, |
| 720 | "getFunctionName", CallSiteGetFunctionName, |
| 721 | "getMethodName", CallSiteGetMethodName, |
| 722 | "getFileName", CallSiteGetFileName, |
| 723 | "getLineNumber", CallSiteGetLineNumber, |
| 724 | "getColumnNumber", CallSiteGetColumnNumber, |
| 725 | "isNative", CallSiteIsNative, |
| 726 | "getPosition", CallSiteGetPosition, |
| 727 | "isConstructor", CallSiteIsConstructor, |
| 728 | "toString", CallSiteToString |
| 729 | ]); |
| 730 | |
| 731 | |
| 732 | function FormatEvalOrigin(script) { |
| 733 | var sourceURL = script.nameOrSourceURL(); |
| 734 | if (sourceURL) { |
| 735 | return sourceURL; |
| 736 | } |
| 737 | |
| 738 | var eval_origin = "eval at "; |
| 739 | if (script.eval_from_function_name) { |
| 740 | eval_origin += script.eval_from_function_name; |
| 741 | } else { |
| 742 | eval_origin += "<anonymous>"; |
| 743 | } |
| 744 | |
| 745 | var eval_from_script = script.eval_from_script; |
| 746 | if (eval_from_script) { |
| 747 | if (eval_from_script.compilation_type == COMPILATION_TYPE_EVAL) { |
| 748 | // eval script originated from another eval. |
| 749 | eval_origin += " (" + FormatEvalOrigin(eval_from_script) + ")"; |
| 750 | } else { |
| 751 | // eval script originated from "real" source. |
| 752 | if (eval_from_script.name) { |
| 753 | eval_origin += " (" + eval_from_script.name; |
| 754 | var location = eval_from_script.locationFromPosition( |
| 755 | script.eval_from_script_position, true); |
| 756 | if (location) { |
| 757 | eval_origin += ":" + (location.line + 1); |
| 758 | eval_origin += ":" + (location.column + 1); |
| 759 | } |
| 760 | eval_origin += ")"; |
| 761 | } else { |
| 762 | eval_origin += " (unknown source)"; |
| 763 | } |
| 764 | } |
| 765 | } |
| 766 | |
| 767 | return eval_origin; |
| 768 | } |
| 769 | |
| 770 | |
| 771 | function FormatErrorString(error) { |
| 772 | try { |
| 773 | return %_Call(ErrorToString, error); |
| 774 | } catch (e) { |
| 775 | try { |
| 776 | return "<error: " + e + ">"; |
| 777 | } catch (ee) { |
| 778 | return "<error>"; |
| 779 | } |
| 780 | } |
| 781 | } |
| 782 | |
| 783 | |
| 784 | function GetStackFrames(raw_stack) { |
| 785 | var frames = new InternalArray(); |
| 786 | var sloppy_frames = raw_stack[0]; |
| 787 | for (var i = 1; i < raw_stack.length; i += 4) { |
| 788 | var recv = raw_stack[i]; |
| 789 | var fun = raw_stack[i + 1]; |
| 790 | var code = raw_stack[i + 2]; |
| 791 | var pc = raw_stack[i + 3]; |
| 792 | var pos = %_IsSmi(code) ? code : %FunctionGetPositionForOffset(code, pc); |
| 793 | sloppy_frames--; |
| 794 | frames.push(new CallSite(recv, fun, pos, (sloppy_frames < 0))); |
| 795 | } |
| 796 | return frames; |
| 797 | } |
| 798 | |
| 799 | |
| 800 | // Flag to prevent recursive call of Error.prepareStackTrace. |
| 801 | var formatting_custom_stack_trace = false; |
| 802 | |
| 803 | |
| 804 | function FormatStackTrace(obj, raw_stack) { |
| 805 | var frames = GetStackFrames(raw_stack); |
| 806 | if (IS_FUNCTION(GlobalError.prepareStackTrace) && |
| 807 | !formatting_custom_stack_trace) { |
| 808 | var array = []; |
| 809 | %MoveArrayContents(frames, array); |
| 810 | formatting_custom_stack_trace = true; |
| 811 | var stack_trace = UNDEFINED; |
| 812 | try { |
| 813 | stack_trace = GlobalError.prepareStackTrace(obj, array); |
| 814 | } catch (e) { |
| 815 | throw e; // The custom formatting function threw. Rethrow. |
| 816 | } finally { |
| 817 | formatting_custom_stack_trace = false; |
| 818 | } |
| 819 | return stack_trace; |
| 820 | } |
| 821 | |
| 822 | var lines = new InternalArray(); |
| 823 | lines.push(FormatErrorString(obj)); |
| 824 | for (var i = 0; i < frames.length; i++) { |
| 825 | var frame = frames[i]; |
| 826 | var line; |
| 827 | try { |
| 828 | line = frame.toString(); |
| 829 | } catch (e) { |
| 830 | try { |
| 831 | line = "<error: " + e + ">"; |
| 832 | } catch (ee) { |
| 833 | // Any code that reaches this point is seriously nasty! |
| 834 | line = "<error>"; |
| 835 | } |
| 836 | } |
| 837 | lines.push(" at " + line); |
| 838 | } |
| 839 | return %_Call(ArrayJoin, lines, "\n"); |
| 840 | } |
| 841 | |
| 842 | |
| 843 | function GetTypeName(receiver, requireConstructor) { |
| 844 | if (IS_NULL_OR_UNDEFINED(receiver)) return null; |
| 845 | if (IS_PROXY(receiver)) return "Proxy"; |
| 846 | |
| 847 | var constructor = %GetDataProperty(TO_OBJECT(receiver), "constructor"); |
| 848 | if (!IS_FUNCTION(constructor)) { |
| 849 | return requireConstructor ? null : %_Call(NoSideEffectsToString, receiver); |
| 850 | } |
| 851 | return %FunctionGetName(constructor); |
| 852 | } |
| 853 | |
| 854 | |
| 855 | // Format the stack trace if not yet done, and return it. |
| 856 | // Cache the formatted stack trace on the holder. |
| 857 | var StackTraceGetter = function() { |
| 858 | var formatted_stack_trace = UNDEFINED; |
| 859 | var holder = this; |
| 860 | while (holder) { |
| 861 | var formatted_stack_trace = |
| 862 | GET_PRIVATE(holder, formattedStackTraceSymbol); |
| 863 | if (IS_UNDEFINED(formatted_stack_trace)) { |
| 864 | // No formatted stack trace available. |
| 865 | var stack_trace = GET_PRIVATE(holder, stackTraceSymbol); |
| 866 | if (IS_UNDEFINED(stack_trace)) { |
| 867 | // Neither formatted nor structured stack trace available. |
| 868 | // Look further up the prototype chain. |
| 869 | holder = %_GetPrototype(holder); |
| 870 | continue; |
| 871 | } |
| 872 | formatted_stack_trace = FormatStackTrace(holder, stack_trace); |
| 873 | SET_PRIVATE(holder, stackTraceSymbol, UNDEFINED); |
| 874 | SET_PRIVATE(holder, formattedStackTraceSymbol, formatted_stack_trace); |
| 875 | } |
| 876 | return formatted_stack_trace; |
| 877 | } |
| 878 | return UNDEFINED; |
| 879 | }; |
| 880 | |
| 881 | |
| 882 | // If the receiver equals the holder, set the formatted stack trace that the |
| 883 | // getter returns. |
| 884 | var StackTraceSetter = function(v) { |
| 885 | if (IsErrorObject(this)) { |
| 886 | SET_PRIVATE(this, stackTraceSymbol, UNDEFINED); |
| 887 | SET_PRIVATE(this, formattedStackTraceSymbol, v); |
| 888 | } |
| 889 | }; |
| 890 | |
| 891 | |
| 892 | // Use a dummy function since we do not actually want to capture a stack trace |
| 893 | // when constructing the initial Error prototytpes. |
| 894 | var captureStackTrace = function() {}; |
| 895 | |
| 896 | |
| 897 | // Set up special error type constructors. |
| 898 | function SetUpError(error_function) { |
| 899 | %FunctionSetInstanceClassName(error_function, 'Error'); |
| 900 | var name = error_function.name; |
| 901 | var prototype = new GlobalObject(); |
| 902 | if (name !== 'Error') { |
| 903 | %InternalSetPrototype(error_function, GlobalError); |
| 904 | %InternalSetPrototype(prototype, GlobalError.prototype); |
| 905 | } |
| 906 | %FunctionSetPrototype(error_function, prototype); |
| 907 | |
| 908 | %AddNamedProperty(error_function.prototype, 'name', name, DONT_ENUM); |
| 909 | %AddNamedProperty(error_function.prototype, 'message', '', DONT_ENUM); |
| 910 | %AddNamedProperty( |
| 911 | error_function.prototype, 'constructor', error_function, DONT_ENUM); |
| 912 | |
| 913 | %SetCode(error_function, function(m) { |
| 914 | if (IS_UNDEFINED(new.target)) return new error_function(m); |
| 915 | |
| 916 | try { captureStackTrace(this, error_function); } catch (e) { } |
| 917 | // Define all the expected properties directly on the error |
| 918 | // object. This avoids going through getters and setters defined |
| 919 | // on prototype objects. |
| 920 | if (!IS_UNDEFINED(m)) { |
| 921 | %AddNamedProperty(this, 'message', TO_STRING(m), DONT_ENUM); |
| 922 | } |
| 923 | }); |
| 924 | |
| 925 | %SetNativeFlag(error_function); |
| 926 | return error_function; |
| 927 | }; |
| 928 | |
| 929 | GlobalError = SetUpError(global.Error); |
| 930 | GlobalEvalError = SetUpError(global.EvalError); |
| 931 | GlobalRangeError = SetUpError(global.RangeError); |
| 932 | GlobalReferenceError = SetUpError(global.ReferenceError); |
| 933 | GlobalSyntaxError = SetUpError(global.SyntaxError); |
| 934 | GlobalTypeError = SetUpError(global.TypeError); |
| 935 | GlobalURIError = SetUpError(global.URIError); |
| 936 | |
| 937 | utils.InstallFunctions(GlobalError.prototype, DONT_ENUM, |
| 938 | ['toString', ErrorToString]); |
| 939 | |
| 940 | function ErrorToString() { |
| 941 | if (!IS_RECEIVER(this)) { |
| 942 | throw MakeTypeError(kCalledOnNonObject, "Error.prototype.toString"); |
| 943 | } |
| 944 | |
| 945 | var name = this.name; |
| 946 | name = IS_UNDEFINED(name) ? "Error" : TO_STRING(name); |
| 947 | |
| 948 | var message = this.message; |
| 949 | message = IS_UNDEFINED(message) ? "" : TO_STRING(message); |
| 950 | |
| 951 | if (name == "") return message; |
| 952 | if (message == "") return name; |
| 953 | return `${name}: ${message}` |
| 954 | } |
| 955 | |
| 956 | function MakeError(type, arg0, arg1, arg2) { |
| 957 | return MakeGenericError(GlobalError, type, arg0, arg1, arg2); |
| 958 | } |
| 959 | |
| 960 | function MakeRangeError(type, arg0, arg1, arg2) { |
| 961 | return MakeGenericError(GlobalRangeError, type, arg0, arg1, arg2); |
| 962 | } |
| 963 | |
| 964 | function MakeSyntaxError(type, arg0, arg1, arg2) { |
| 965 | return MakeGenericError(GlobalSyntaxError, type, arg0, arg1, arg2); |
| 966 | } |
| 967 | |
| 968 | function MakeTypeError(type, arg0, arg1, arg2) { |
| 969 | return MakeGenericError(GlobalTypeError, type, arg0, arg1, arg2); |
| 970 | } |
| 971 | |
| 972 | function MakeURIError() { |
| 973 | return MakeGenericError(GlobalURIError, kURIMalformed); |
| 974 | } |
| 975 | |
| 976 | // Boilerplate for exceptions for stack overflows. Used from |
| 977 | // Isolate::StackOverflow(). |
| 978 | var StackOverflowBoilerplate = MakeRangeError(kStackOverflow); |
| 979 | utils.InstallGetterSetter(StackOverflowBoilerplate, 'stack', |
| 980 | StackTraceGetter, StackTraceSetter) |
| 981 | |
| 982 | // Define actual captureStackTrace function after everything has been set up. |
| 983 | captureStackTrace = function captureStackTrace(obj, cons_opt) { |
| 984 | // Define accessors first, as this may fail and throw. |
| 985 | ObjectDefineProperty(obj, 'stack', { get: StackTraceGetter, |
| 986 | set: StackTraceSetter, |
| 987 | configurable: true }); |
| 988 | %CollectStackTrace(obj, cons_opt ? cons_opt : captureStackTrace); |
| 989 | }; |
| 990 | |
| 991 | GlobalError.captureStackTrace = captureStackTrace; |
| 992 | |
| 993 | %InstallToContext([ |
| 994 | "get_stack_trace_line_fun", GetStackTraceLine, |
| 995 | "make_error_function", MakeGenericError, |
| 996 | "make_range_error", MakeRangeError, |
| 997 | "make_type_error", MakeTypeError, |
| 998 | "message_get_column_number", GetColumnNumber, |
| 999 | "message_get_line_number", GetLineNumber, |
| 1000 | "message_get_source_line", GetSourceLine, |
| 1001 | "no_side_effects_to_string_fun", NoSideEffectsToString, |
| 1002 | "stack_overflow_boilerplate", StackOverflowBoilerplate, |
| 1003 | ]); |
| 1004 | |
| 1005 | utils.Export(function(to) { |
| 1006 | to.ErrorToString = ErrorToString; |
| 1007 | to.MakeError = MakeError; |
| 1008 | to.MakeRangeError = MakeRangeError; |
| 1009 | to.MakeSyntaxError = MakeSyntaxError; |
| 1010 | to.MakeTypeError = MakeTypeError; |
| 1011 | to.MakeURIError = MakeURIError; |
| 1012 | }); |
| 1013 | |
| 1014 | }); |