// Copyright 2012 the V8 project authors. All rights reserved. // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following // disclaimer in the documentation and/or other materials provided // with the distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived // from this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. // ------------------------------------------------------------------- var kMessages = { // Error cyclic_proto: ["Cyclic __proto__ value"], code_gen_from_strings: ["%0"], generator_running: ["Generator is already running"], generator_finished: ["Generator has already finished"], // TypeError unexpected_token: ["Unexpected token ", "%0"], unexpected_token_number: ["Unexpected number"], unexpected_token_string: ["Unexpected string"], unexpected_token_identifier: ["Unexpected identifier"], unexpected_reserved: ["Unexpected reserved word"], unexpected_strict_reserved: ["Unexpected strict mode reserved word"], unexpected_eos: ["Unexpected end of input"], malformed_regexp: ["Invalid regular expression: /", "%0", "/: ", "%1"], unterminated_regexp: ["Invalid regular expression: missing /"], regexp_flags: ["Cannot supply flags when constructing one RegExp from another"], incompatible_method_receiver: ["Method ", "%0", " called on incompatible receiver ", "%1"], multiple_defaults_in_switch: ["More than one default clause in switch statement"], newline_after_throw: ["Illegal newline after throw"], redeclaration: ["%0", " '", "%1", "' has already been declared"], no_catch_or_finally: ["Missing catch or finally after try"], unknown_label: ["Undefined label '", "%0", "'"], uncaught_exception: ["Uncaught ", "%0"], stack_trace: ["Stack Trace:\n", "%0"], called_non_callable: ["%0", " is not a function"], undefined_method: ["Object ", "%1", " has no method '", "%0", "'"], property_not_function: ["Property '", "%0", "' of object ", "%1", " is not a function"], cannot_convert_to_primitive: ["Cannot convert object to primitive value"], not_constructor: ["%0", " is not a constructor"], not_defined: ["%0", " is not defined"], non_object_property_load: ["Cannot read property '", "%0", "' of ", "%1"], non_object_property_store: ["Cannot set property '", "%0", "' of ", "%1"], with_expression: ["%0", " has no properties"], illegal_invocation: ["Illegal invocation"], no_setter_in_callback: ["Cannot set property ", "%0", " of ", "%1", " which has only a getter"], apply_non_function: ["Function.prototype.apply was called on ", "%0", ", which is a ", "%1", " and not a function"], apply_wrong_args: ["Function.prototype.apply: Arguments list has wrong type"], invalid_in_operator_use: ["Cannot use 'in' operator to search for '", "%0", "' in ", "%1"], instanceof_function_expected: ["Expecting a function in instanceof check, but got ", "%0"], instanceof_nonobject_proto: ["Function has non-object prototype '", "%0", "' in instanceof check"], undefined_or_null_to_object: ["Cannot convert undefined or null to object"], reduce_no_initial: ["Reduce of empty array with no initial value"], getter_must_be_callable: ["Getter must be a function: ", "%0"], setter_must_be_callable: ["Setter must be a function: ", "%0"], value_and_accessor: ["Invalid property. A property cannot both have accessors and be writable or have a value, ", "%0"], proto_object_or_null: ["Object prototype may only be an Object or null: ", "%0"], property_desc_object: ["Property description must be an object: ", "%0"], redefine_disallowed: ["Cannot redefine property: ", "%0"], define_disallowed: ["Cannot define property:", "%0", ", object is not extensible."], non_extensible_proto: ["%0", " is not extensible"], handler_non_object: ["Proxy.", "%0", " called with non-object as handler"], proto_non_object: ["Proxy.", "%0", " called with non-object as prototype"], trap_function_expected: ["Proxy.", "%0", " called with non-function for '", "%1", "' trap"], handler_trap_missing: ["Proxy handler ", "%0", " has no '", "%1", "' trap"], handler_trap_must_be_callable: ["Proxy handler ", "%0", " has non-callable '", "%1", "' trap"], handler_returned_false: ["Proxy handler ", "%0", " returned false from '", "%1", "' trap"], handler_returned_undefined: ["Proxy handler ", "%0", " returned undefined from '", "%1", "' trap"], proxy_prop_not_configurable: ["Proxy handler ", "%0", " returned non-configurable descriptor for property '", "%2", "' from '", "%1", "' trap"], proxy_non_object_prop_names: ["Trap '", "%1", "' returned non-object ", "%0"], proxy_repeated_prop_name: ["Trap '", "%1", "' returned repeated property name '", "%2", "'"], invalid_weakmap_key: ["Invalid value used as weak map key"], invalid_weakset_value: ["Invalid value used in weak set"], not_date_object: ["this is not a Date object."], observe_non_object: ["Object.", "%0", " cannot ", "%0", " non-object"], observe_non_function: ["Object.", "%0", " cannot deliver to non-function"], observe_callback_frozen: ["Object.observe cannot deliver to a frozen function object"], observe_invalid_accept: ["Object.observe accept must be an array of strings."], observe_type_non_string: ["Invalid changeRecord with non-string 'type' property"], observe_perform_non_string: ["Invalid non-string changeType"], observe_perform_non_function: ["Cannot perform non-function"], observe_notify_non_notifier: ["notify called on non-notifier object"], not_typed_array: ["this is not a typed array."], invalid_argument: ["invalid_argument"], data_view_not_array_buffer: ["First argument to DataView constructor must be an ArrayBuffer"], constructor_not_function: ["Constructor ", "%0", " requires 'new'"], not_a_promise: ["%0", " is not a promise"], resolver_not_a_function: ["Promise resolver ", "%0", " is not a function"], promise_cyclic: ["Chaining cycle detected for promise ", "%0"], array_functions_on_frozen: ["Cannot modify frozen array elements"], array_functions_change_sealed: ["Cannot add/remove sealed array elements"], first_argument_not_regexp: ["First argument to ", "%0", " must not be a regular expression"], // RangeError invalid_array_length: ["Invalid array length"], invalid_array_buffer_length: ["Invalid array buffer length"], invalid_string_length: ["Invalid string length"], invalid_typed_array_offset: ["Start offset is too large:"], invalid_typed_array_length: ["Invalid typed array length"], invalid_typed_array_alignment: ["%0", " of ", "%1", " should be a multiple of ", "%2"], typed_array_set_source_too_large: ["Source is too large"], typed_array_set_negative_offset: ["Start offset is negative"], invalid_data_view_offset: ["Start offset is outside the bounds of the buffer"], invalid_data_view_length: ["Invalid data view length"], invalid_data_view_accessor_offset: ["Offset is outside the bounds of the DataView"], stack_overflow: ["Maximum call stack size exceeded"], invalid_time_value: ["Invalid time value"], invalid_count_value: ["Invalid count value"], // ReferenceError invalid_lhs_in_assignment: ["Invalid left-hand side in assignment"], invalid_lhs_in_for: ["Invalid left-hand side in for-loop"], invalid_lhs_in_postfix_op: ["Invalid left-hand side expression in postfix operation"], invalid_lhs_in_prefix_op: ["Invalid left-hand side expression in prefix operation"], // SyntaxError paren_in_arg_string: ["Function arg string contains parenthesis"], not_isvar: ["builtin %IS_VAR: not a variable"], single_function_literal: ["Single function literal required"], invalid_regexp_flags: ["Invalid flags supplied to RegExp constructor '", "%0", "'"], invalid_regexp: ["Invalid RegExp pattern /", "%0", "/"], illegal_break: ["Illegal break statement"], illegal_continue: ["Illegal continue statement"], illegal_return: ["Illegal return statement"], illegal_let: ["Illegal let declaration outside extended mode"], error_loading_debugger: ["Error loading debugger"], no_input_to_regexp: ["No input to ", "%0"], invalid_json: ["String '", "%0", "' is not valid JSON"], circular_structure: ["Converting circular structure to JSON"], called_on_non_object: ["%0", " called on non-object"], called_on_null_or_undefined: ["%0", " called on null or undefined"], array_indexof_not_defined: ["Array.getIndexOf: Argument undefined"], object_not_extensible: ["Can't add property ", "%0", ", object is not extensible"], illegal_access: ["Illegal access"], invalid_preparser_data: ["Invalid preparser data for function ", "%0"], strict_mode_with: ["Strict mode code may not include a with statement"], strict_eval_arguments: ["Unexpected eval or arguments in strict mode"], too_many_arguments: ["Too many arguments in function call (only 65535 allowed)"], too_many_parameters: ["Too many parameters in function definition (only 65535 allowed)"], too_many_variables: ["Too many variables declared (only 131071 allowed)"], strict_param_dupe: ["Strict mode function may not have duplicate parameter names"], strict_octal_literal: ["Octal literals are not allowed in strict mode."], strict_duplicate_property: ["Duplicate data property in object literal not allowed in strict mode"], accessor_data_property: ["Object literal may not have data and accessor property with the same name"], accessor_get_set: ["Object literal may not have multiple get/set accessors with the same name"], strict_delete: ["Delete of an unqualified identifier in strict mode."], strict_delete_property: ["Cannot delete property '", "%0", "' of ", "%1"], strict_const: ["Use of const in strict mode."], strict_function: ["In strict mode code, functions can only be declared at top level or immediately within another function." ], strict_read_only_property: ["Cannot assign to read only property '", "%0", "' of ", "%1"], strict_cannot_assign: ["Cannot assign to read only '", "%0", "' in strict mode"], strict_poison_pill: ["'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them"], strict_caller: ["Illegal access to a strict mode caller function."], unprotected_let: ["Illegal let declaration in unprotected statement context."], unprotected_const: ["Illegal const declaration in unprotected statement context."], cant_prevent_ext_external_array_elements: ["Cannot prevent extension of an object with external array elements"], redef_external_array_element: ["Cannot redefine a property of an object with external array elements"], harmony_const_assign: ["Assignment to constant variable."], symbol_to_string: ["Cannot convert a Symbol value to a string"], symbol_to_primitive: ["Cannot convert a Symbol wrapper object to a primitive value"], invalid_module_path: ["Module does not export '", "%0", "', or export is not itself a module"], module_type_error: ["Module '", "%0", "' used improperly"], module_export_undefined: ["Export '", "%0", "' is not defined in module"] }; function FormatString(format, args) { var result = ""; var arg_num = 0; for (var i = 0; i < format.length; i++) { var str = format[i]; if (str.length == 2 && %_StringCharCodeAt(str, 0) == 0x25) { // Two-char string starts with "%". var arg_num = (%_StringCharCodeAt(str, 1) - 0x30) >>> 0; if (arg_num < 4) { // str is one of %0, %1, %2 or %3. try { str = NoSideEffectToString(args[arg_num]); if (str.length > 256) { str = %SubString(str, 0, 239) + "......" + %SubString(str, str.length - 2, str.length); } } catch (e) { if (%IsJSModule(args[arg_num])) str = "module"; else if (IS_SPEC_OBJECT(args[arg_num])) str = "object"; else str = "#"; } } } result += str; } return result; } function NoSideEffectToString(obj) { if (IS_STRING(obj)) return obj; if (IS_NUMBER(obj)) return %_NumberToString(obj); if (IS_BOOLEAN(obj)) return x ? 'true' : 'false'; if (IS_UNDEFINED(obj)) return 'undefined'; if (IS_NULL(obj)) return 'null'; if (IS_FUNCTION(obj)) return %_CallFunction(obj, FunctionToString); if (IS_OBJECT(obj) && %GetDataProperty(obj, "toString") === ObjectToString) { var constructor = %GetDataProperty(obj, "constructor"); if (typeof constructor == "function") { var constructorName = constructor.name; if (IS_STRING(constructorName) && constructorName !== "") { return "#<" + constructorName + ">"; } } } if (CanBeSafelyTreatedAsAnErrorObject(obj)) { return %_CallFunction(obj, ErrorToString); } return %_CallFunction(obj, ObjectToString); } // To determine whether we can safely stringify an object using ErrorToString // without the risk of side-effects, we need to check whether the object is // either an instance of a native error type (via '%_ClassOf'), or has $Error // in its prototype chain and hasn't overwritten 'toString' with something // strange and unusual. function CanBeSafelyTreatedAsAnErrorObject(obj) { switch (%_ClassOf(obj)) { case 'Error': case 'EvalError': case 'RangeError': case 'ReferenceError': case 'SyntaxError': case 'TypeError': case 'URIError': return true; } var objToString = %GetDataProperty(obj, "toString"); return obj instanceof $Error && objToString === ErrorToString; } // When formatting internally created error messages, do not // invoke overwritten error toString methods but explicitly use // the error to string method. This is to avoid leaking error // objects between script tags in a browser setting. function ToStringCheckErrorObject(obj) { if (CanBeSafelyTreatedAsAnErrorObject(obj)) { return %_CallFunction(obj, ErrorToString); } else { return ToString(obj); } } function ToDetailString(obj) { if (obj != null && IS_OBJECT(obj) && obj.toString === ObjectToString) { var constructor = obj.constructor; if (typeof constructor == "function") { var constructorName = constructor.name; if (IS_STRING(constructorName) && constructorName !== "") { return "#<" + constructorName + ">"; } } } return ToStringCheckErrorObject(obj); } function MakeGenericError(constructor, type, args) { if (IS_UNDEFINED(args)) args = []; return new constructor(FormatMessage(type, args)); } /** * Set up the Script function and constructor. */ %FunctionSetInstanceClassName(Script, 'Script'); %SetProperty(Script.prototype, 'constructor', Script, DONT_ENUM | DONT_DELETE | READ_ONLY); %SetCode(Script, function(x) { // Script objects can only be created by the VM. throw new $Error("Not supported"); }); // Helper functions; called from the runtime system. function FormatMessage(type, args) { var format = kMessages[type]; if (!format) return ""; return FormatString(format, args); } function GetLineNumber(message) { var start_position = %MessageGetStartPosition(message); if (start_position == -1) return kNoLineNumberInfo; var script = %MessageGetScript(message); var location = script.locationFromPosition(start_position, true); if (location == null) return kNoLineNumberInfo; return location.line + 1; } // Returns the source code line containing the given source // position, or the empty string if the position is invalid. function GetSourceLine(message) { var script = %MessageGetScript(message); var start_position = %MessageGetStartPosition(message); var location = script.locationFromPosition(start_position, true); if (location == null) return ""; location.restrict(); return location.sourceText(); } function MakeTypeError(type, args) { return MakeGenericError($TypeError, type, args); } function MakeRangeError(type, args) { return MakeGenericError($RangeError, type, args); } function MakeSyntaxError(type, args) { return MakeGenericError($SyntaxError, type, args); } function MakeReferenceError(type, args) { return MakeGenericError($ReferenceError, type, args); } function MakeEvalError(type, args) { return MakeGenericError($EvalError, type, args); } function MakeError(type, args) { return MakeGenericError($Error, type, args); } /** * Find a line number given a specific source position. * @param {number} position The source position. * @return {number} 0 if input too small, -1 if input too large, else the line number. */ function ScriptLineFromPosition(position) { var lower = 0; var upper = this.lineCount() - 1; var line_ends = this.line_ends; // We'll never find invalid positions so bail right away. if (position > line_ends[upper]) { return -1; } // This means we don't have to safe-guard indexing line_ends[i - 1]. if (position <= line_ends[0]) { return 0; } // Binary search to find line # from position range. while (upper >= 1) { var i = (lower + upper) >> 1; if (position > line_ends[i]) { lower = i + 1; } else if (position <= line_ends[i - 1]) { upper = i - 1; } else { return i; } } return -1; } /** * Get information on a specific source position. * @param {number} position The source position * @param {boolean} include_resource_offset Set to true to have the resource * offset added to the location * @return {SourceLocation} * If line is negative or not in the source null is returned. */ function ScriptLocationFromPosition(position, include_resource_offset) { var line = this.lineFromPosition(position); if (line == -1) return null; // Determine start, end and column. var line_ends = this.line_ends; var start = line == 0 ? 0 : line_ends[line - 1] + 1; var end = line_ends[line]; if (end > 0 && %_CallFunction(this.source, end - 1, StringCharAt) == '\r') { end--; } var column = position - start; // Adjust according to the offset within the resource. if (include_resource_offset) { line += this.line_offset; if (line == this.line_offset) { column += this.column_offset; } } return new SourceLocation(this, position, line, column, start, end); } /** * Get information on a specific source line and column possibly offset by a * fixed source position. This function is used to find a source position from * a line and column position. The fixed source position offset is typically * used to find a source position in a function based on a line and column in * the source for the function alone. The offset passed will then be the * start position of the source for the function within the full script source. * @param {number} opt_line The line within the source. Default value is 0 * @param {number} opt_column The column in within the line. Default value is 0 * @param {number} opt_offset_position The offset from the begining of the * source from where the line and column calculation starts. * Default value is 0 * @return {SourceLocation} * If line is negative or not in the source null is returned. */ function ScriptLocationFromLine(opt_line, opt_column, opt_offset_position) { // Default is the first line in the script. Lines in the script is relative // to the offset within the resource. var line = 0; if (!IS_UNDEFINED(opt_line)) { line = opt_line - this.line_offset; } // Default is first column. If on the first line add the offset within the // resource. var column = opt_column || 0; if (line == 0) { column -= this.column_offset; } var offset_position = opt_offset_position || 0; if (line < 0 || column < 0 || offset_position < 0) return null; if (line == 0) { return this.locationFromPosition(offset_position + column, false); } else { // Find the line where the offset position is located. var offset_line = this.lineFromPosition(offset_position); if (offset_line == -1 || offset_line + line >= this.lineCount()) { return null; } return this.locationFromPosition( this.line_ends[offset_line + line - 1] + 1 + column); // line > 0 here. } } /** * Get a slice of source code from the script. The boundaries for the slice is * specified in lines. * @param {number} opt_from_line The first line (zero bound) in the slice. * Default is 0 * @param {number} opt_to_column The last line (zero bound) in the slice (non * inclusive). Default is the number of lines in the script * @return {SourceSlice} The source slice or null of the parameters where * invalid */ function ScriptSourceSlice(opt_from_line, opt_to_line) { var from_line = IS_UNDEFINED(opt_from_line) ? this.line_offset : opt_from_line; var to_line = IS_UNDEFINED(opt_to_line) ? this.line_offset + this.lineCount() : opt_to_line; // Adjust according to the offset within the resource. from_line -= this.line_offset; to_line -= this.line_offset; if (from_line < 0) from_line = 0; if (to_line > this.lineCount()) to_line = this.lineCount(); // Check parameters. if (from_line >= this.lineCount() || to_line < 0 || from_line > to_line) { return null; } var line_ends = this.line_ends; var from_position = from_line == 0 ? 0 : line_ends[from_line - 1] + 1; var to_position = to_line == 0 ? 0 : line_ends[to_line - 1] + 1; // Return a source slice with line numbers re-adjusted to the resource. return new SourceSlice(this, from_line + this.line_offset, to_line + this.line_offset, from_position, to_position); } function ScriptSourceLine(opt_line) { // Default is the first line in the script. Lines in the script are relative // to the offset within the resource. var line = 0; if (!IS_UNDEFINED(opt_line)) { line = opt_line - this.line_offset; } // Check parameter. if (line < 0 || this.lineCount() <= line) { return null; } // Return the source line. var line_ends = this.line_ends; var start = line == 0 ? 0 : line_ends[line - 1] + 1; var end = line_ends[line]; return %_CallFunction(this.source, start, end, StringSubstring); } /** * Returns the number of source lines. * @return {number} * Number of source lines. */ function ScriptLineCount() { // Return number of source lines. return this.line_ends.length; } /** * If sourceURL comment is available and script starts at zero returns sourceURL * comment contents. Otherwise, script name is returned. See * http://fbug.googlecode.com/svn/branches/firebug1.1/docs/ReleaseNotes_1.1.txt * and Source Map Revision 3 proposal for details on using //# sourceURL and * deprecated //@ sourceURL comment to identify scripts that don't have name. * * @return {?string} script name if present, value for //# sourceURL or * deprecated //@ sourceURL comment otherwise. */ function ScriptNameOrSourceURL() { if (this.line_offset > 0 || this.column_offset > 0) { return this.name; } // The result is cached as on long scripts it takes noticable time to search // for the sourceURL. if (this.hasCachedNameOrSourceURL) { return this.cachedNameOrSourceURL; } this.hasCachedNameOrSourceURL = true; // TODO(608): the spaces in a regexp below had to be escaped as \040 // because this file is being processed by js2c whose handling of spaces // in regexps is broken. Also, ['"] are excluded from allowed URLs to // avoid matches against sources that invoke evals with sourceURL. // A better solution would be to detect these special comments in // the scanner/parser. var source = ToString(this.source); var sourceUrlPos = %StringIndexOf(source, "sourceURL=", 0); this.cachedNameOrSourceURL = this.name; if (sourceUrlPos > 4) { var sourceUrlPattern = /\/\/[#@][\040\t]sourceURL=[\040\t]*([^\s\'\"]*)[\040\t]*$/gm; // Don't reuse lastMatchInfo here, so we create a new array with room // for four captures (array with length one longer than the index // of the fourth capture, where the numbering is zero-based). var matchInfo = new InternalArray(CAPTURE(3) + 1); var match = %_RegExpExec(sourceUrlPattern, source, sourceUrlPos - 4, matchInfo); if (match) { this.cachedNameOrSourceURL = %_SubString(source, matchInfo[CAPTURE(2)], matchInfo[CAPTURE(3)]); } } return this.cachedNameOrSourceURL; } SetUpLockedPrototype(Script, $Array("source", "name", "line_ends", "line_offset", "column_offset", "cachedNameOrSourceURL", "hasCachedNameOrSourceURL" ), $Array( "lineFromPosition", ScriptLineFromPosition, "locationFromPosition", ScriptLocationFromPosition, "locationFromLine", ScriptLocationFromLine, "sourceSlice", ScriptSourceSlice, "sourceLine", ScriptSourceLine, "lineCount", ScriptLineCount, "nameOrSourceURL", ScriptNameOrSourceURL ) ); /** * Class for source location. A source location is a position within some * source with the following properties: * script : script object for the source * line : source line number * column : source column within the line * position : position within the source * start : position of start of source context (inclusive) * end : position of end of source context (not inclusive) * Source text for the source context is the character interval * [start, end[. In most cases end will point to a newline character. * It might point just past the final position of the source if the last * source line does not end with a newline character. * @param {Script} script The Script object for which this is a location * @param {number} position Source position for the location * @param {number} line The line number for the location * @param {number} column The column within the line for the location * @param {number} start Source position for start of source context * @param {number} end Source position for end of source context * @constructor */ function SourceLocation(script, position, line, column, start, end) { this.script = script; this.position = position; this.line = line; this.column = column; this.start = start; this.end = end; } var kLineLengthLimit = 78; /** * Restrict source location start and end positions to make the source slice * no more that a certain number of characters wide. * @param {number} opt_limit The with limit of the source text with a default * of 78 * @param {number} opt_before The number of characters to prefer before the * position with a default value of 10 less that the limit */ function SourceLocationRestrict(opt_limit, opt_before) { // Find the actual limit to use. var limit; var before; if (!IS_UNDEFINED(opt_limit)) { limit = opt_limit; } else { limit = kLineLengthLimit; } if (!IS_UNDEFINED(opt_before)) { before = opt_before; } else { // If no before is specified center for small limits and perfer more source // before the the position that after for longer limits. if (limit <= 20) { before = $floor(limit / 2); } else { before = limit - 10; } } if (before >= limit) { before = limit - 1; } // If the [start, end[ interval is too big we restrict // it in one or both ends. We make sure to always produce // restricted intervals of maximum allowed size. if (this.end - this.start > limit) { var start_limit = this.position - before; var end_limit = this.position + limit - before; if (this.start < start_limit && end_limit < this.end) { this.start = start_limit; this.end = end_limit; } else if (this.start < start_limit) { this.start = this.end - limit; } else { this.end = this.start + limit; } } } /** * Get the source text for a SourceLocation * @return {String} * Source text for this location. */ function SourceLocationSourceText() { return %_CallFunction(this.script.source, this.start, this.end, StringSubstring); } SetUpLockedPrototype(SourceLocation, $Array("script", "position", "line", "column", "start", "end"), $Array( "restrict", SourceLocationRestrict, "sourceText", SourceLocationSourceText ) ); /** * Class for a source slice. A source slice is a part of a script source with * the following properties: * script : script object for the source * from_line : line number for the first line in the slice * to_line : source line number for the last line in the slice * from_position : position of the first character in the slice * to_position : position of the last character in the slice * The to_line and to_position are not included in the slice, that is the lines * in the slice are [from_line, to_line[. Likewise the characters in the slice * are [from_position, to_position[. * @param {Script} script The Script object for the source slice * @param {number} from_line * @param {number} to_line * @param {number} from_position * @param {number} to_position * @constructor */ function SourceSlice(script, from_line, to_line, from_position, to_position) { this.script = script; this.from_line = from_line; this.to_line = to_line; this.from_position = from_position; this.to_position = to_position; } /** * Get the source text for a SourceSlice * @return {String} Source text for this slice. The last line will include * the line terminating characters (if any) */ function SourceSliceSourceText() { return %_CallFunction(this.script.source, this.from_position, this.to_position, StringSubstring); } SetUpLockedPrototype(SourceSlice, $Array("script", "from_line", "to_line", "from_position", "to_position"), $Array("sourceText", SourceSliceSourceText) ); // Returns the offset of the given position within the containing // line. function GetPositionInLine(message) { var script = %MessageGetScript(message); var start_position = %MessageGetStartPosition(message); var location = script.locationFromPosition(start_position, false); if (location == null) return -1; location.restrict(); return start_position - location.start; } function GetStackTraceLine(recv, fun, pos, isGlobal) { return new CallSite(recv, fun, pos, false).toString(); } // ---------------------------------------------------------------------------- // Error implementation //TODO(rossberg) var CallSiteReceiverKey = NEW_PRIVATE("receiver"); var CallSiteFunctionKey = NEW_PRIVATE("function"); var CallSitePositionKey = NEW_PRIVATE("position"); var CallSiteStrictModeKey = NEW_PRIVATE("strict mode"); function CallSite(receiver, fun, pos, strict_mode) { SET_PRIVATE(this, CallSiteReceiverKey, receiver); SET_PRIVATE(this, CallSiteFunctionKey, fun); SET_PRIVATE(this, CallSitePositionKey, pos); SET_PRIVATE(this, CallSiteStrictModeKey, strict_mode); } function CallSiteGetThis() { return GET_PRIVATE(this, CallSiteStrictModeKey) ? UNDEFINED : GET_PRIVATE(this, CallSiteReceiverKey); } function CallSiteGetTypeName() { return GetTypeName(GET_PRIVATE(this, CallSiteReceiverKey), false); } function CallSiteIsToplevel() { if (GET_PRIVATE(this, CallSiteReceiverKey) == null) { return true; } return IS_GLOBAL(GET_PRIVATE(this, CallSiteReceiverKey)); } function CallSiteIsEval() { var script = %FunctionGetScript(GET_PRIVATE(this, CallSiteFunctionKey)); return script && script.compilation_type == COMPILATION_TYPE_EVAL; } function CallSiteGetEvalOrigin() { var script = %FunctionGetScript(GET_PRIVATE(this, CallSiteFunctionKey)); return FormatEvalOrigin(script); } function CallSiteGetScriptNameOrSourceURL() { var script = %FunctionGetScript(GET_PRIVATE(this, CallSiteFunctionKey)); return script ? script.nameOrSourceURL() : null; } function CallSiteGetFunction() { return GET_PRIVATE(this, CallSiteStrictModeKey) ? UNDEFINED : GET_PRIVATE(this, CallSiteFunctionKey); } function CallSiteGetFunctionName() { // See if the function knows its own name var name = GET_PRIVATE(this, CallSiteFunctionKey).name; if (name) { return name; } name = %FunctionGetInferredName(GET_PRIVATE(this, CallSiteFunctionKey)); if (name) { return name; } // Maybe this is an evaluation? var script = %FunctionGetScript(GET_PRIVATE(this, CallSiteFunctionKey)); if (script && script.compilation_type == COMPILATION_TYPE_EVAL) { return "eval"; } return null; } function CallSiteGetMethodName() { // See if we can find a unique property on the receiver that holds // this function. var receiver = GET_PRIVATE(this, CallSiteReceiverKey); var fun = GET_PRIVATE(this, CallSiteFunctionKey); var ownName = fun.name; if (ownName && receiver && (%_CallFunction(receiver, ownName, ObjectLookupGetter) === fun || %_CallFunction(receiver, ownName, ObjectLookupSetter) === fun || (IS_OBJECT(receiver) && %GetDataProperty(receiver, ownName) === fun))) { // To handle DontEnum properties we guess that the method has // the same name as the function. return ownName; } var name = null; for (var prop in receiver) { if (%_CallFunction(receiver, prop, ObjectLookupGetter) === fun || %_CallFunction(receiver, prop, ObjectLookupSetter) === fun || (IS_OBJECT(receiver) && %GetDataProperty(receiver, prop) === fun)) { // If we find more than one match bail out to avoid confusion. if (name) { return null; } name = prop; } } if (name) { return name; } return null; } function CallSiteGetFileName() { var script = %FunctionGetScript(GET_PRIVATE(this, CallSiteFunctionKey)); return script ? script.name : null; } function CallSiteGetLineNumber() { if (GET_PRIVATE(this, CallSitePositionKey) == -1) { return null; } var script = %FunctionGetScript(GET_PRIVATE(this, CallSiteFunctionKey)); var location = null; if (script) { location = script.locationFromPosition( GET_PRIVATE(this, CallSitePositionKey), true); } return location ? location.line + 1 : null; } function CallSiteGetColumnNumber() { if (GET_PRIVATE(this, CallSitePositionKey) == -1) { return null; } var script = %FunctionGetScript(GET_PRIVATE(this, CallSiteFunctionKey)); var location = null; if (script) { location = script.locationFromPosition( GET_PRIVATE(this, CallSitePositionKey), true); } return location ? location.column + 1: null; } function CallSiteIsNative() { var script = %FunctionGetScript(GET_PRIVATE(this, CallSiteFunctionKey)); return script ? (script.type == TYPE_NATIVE) : false; } function CallSiteGetPosition() { return GET_PRIVATE(this, CallSitePositionKey); } function CallSiteIsConstructor() { var receiver = GET_PRIVATE(this, CallSiteReceiverKey); var constructor = (receiver != null && IS_OBJECT(receiver)) ? %GetDataProperty(receiver, "constructor") : null; if (!constructor) return false; return GET_PRIVATE(this, CallSiteFunctionKey) === constructor; } function CallSiteToString() { var fileName; var fileLocation = ""; if (this.isNative()) { fileLocation = "native"; } else { fileName = this.getScriptNameOrSourceURL(); if (!fileName && this.isEval()) { fileLocation = this.getEvalOrigin(); fileLocation += ", "; // Expecting source position to follow. } if (fileName) { fileLocation += fileName; } else { // Source code does not originate from a file and is not native, but we // can still get the source position inside the source string, e.g. in // an eval string. fileLocation += ""; } var lineNumber = this.getLineNumber(); if (lineNumber != null) { fileLocation += ":" + lineNumber; var columnNumber = this.getColumnNumber(); if (columnNumber) { fileLocation += ":" + columnNumber; } } } var line = ""; var functionName = this.getFunctionName(); var addSuffix = true; var isConstructor = this.isConstructor(); var isMethodCall = !(this.isToplevel() || isConstructor); if (isMethodCall) { var typeName = GetTypeName(GET_PRIVATE(this, CallSiteReceiverKey), true); var methodName = this.getMethodName(); if (functionName) { if (typeName && %_CallFunction(functionName, typeName, StringIndexOf) != 0) { line += typeName + "."; } line += functionName; if (methodName && (%_CallFunction(functionName, "." + methodName, StringIndexOf) != functionName.length - methodName.length - 1)) { line += " [as " + methodName + "]"; } } else { line += typeName + "." + (methodName || ""); } } else if (isConstructor) { line += "new " + (functionName || ""); } else if (functionName) { line += functionName; } else { line += fileLocation; addSuffix = false; } if (addSuffix) { line += " (" + fileLocation + ")"; } return line; } SetUpLockedPrototype(CallSite, $Array("receiver", "fun", "pos"), $Array( "getThis", CallSiteGetThis, "getTypeName", CallSiteGetTypeName, "isToplevel", CallSiteIsToplevel, "isEval", CallSiteIsEval, "getEvalOrigin", CallSiteGetEvalOrigin, "getScriptNameOrSourceURL", CallSiteGetScriptNameOrSourceURL, "getFunction", CallSiteGetFunction, "getFunctionName", CallSiteGetFunctionName, "getMethodName", CallSiteGetMethodName, "getFileName", CallSiteGetFileName, "getLineNumber", CallSiteGetLineNumber, "getColumnNumber", CallSiteGetColumnNumber, "isNative", CallSiteIsNative, "getPosition", CallSiteGetPosition, "isConstructor", CallSiteIsConstructor, "toString", CallSiteToString )); function FormatEvalOrigin(script) { var sourceURL = script.nameOrSourceURL(); if (sourceURL) { return sourceURL; } var eval_origin = "eval at "; if (script.eval_from_function_name) { eval_origin += script.eval_from_function_name; } else { eval_origin += ""; } var eval_from_script = script.eval_from_script; if (eval_from_script) { if (eval_from_script.compilation_type == COMPILATION_TYPE_EVAL) { // eval script originated from another eval. eval_origin += " (" + FormatEvalOrigin(eval_from_script) + ")"; } else { // eval script originated from "real" source. if (eval_from_script.name) { eval_origin += " (" + eval_from_script.name; var location = eval_from_script.locationFromPosition( script.eval_from_script_position, true); if (location) { eval_origin += ":" + (location.line + 1); eval_origin += ":" + (location.column + 1); } eval_origin += ")"; } else { eval_origin += " (unknown source)"; } } } return eval_origin; } function FormatErrorString(error) { try { return %_CallFunction(error, ErrorToString); } catch (e) { try { return ""; } catch (ee) { return ""; } } } function GetStackFrames(raw_stack) { var frames = new InternalArray(); var sloppy_frames = raw_stack[0]; for (var i = 1; i < raw_stack.length; i += 4) { var recv = raw_stack[i]; var fun = raw_stack[i + 1]; var code = raw_stack[i + 2]; var pc = raw_stack[i + 3]; var pos = %FunctionGetPositionForOffset(code, pc); sloppy_frames--; frames.push(new CallSite(recv, fun, pos, (sloppy_frames < 0))); } return frames; } // Flag to prevent recursive call of Error.prepareStackTrace. var formatting_custom_stack_trace = false; function FormatStackTrace(obj, error_string, frames) { if (IS_FUNCTION($Error.prepareStackTrace) && !formatting_custom_stack_trace) { var array = []; %MoveArrayContents(frames, array); formatting_custom_stack_trace = true; var stack_trace = UNDEFINED; try { stack_trace = $Error.prepareStackTrace(obj, array); } catch (e) { throw e; // The custom formatting function threw. Rethrow. } finally { formatting_custom_stack_trace = false; } return stack_trace; } var lines = new InternalArray(); lines.push(error_string); for (var i = 0; i < frames.length; i++) { var frame = frames[i]; var line; try { line = frame.toString(); } catch (e) { try { line = ""; } catch (ee) { // Any code that reaches this point is seriously nasty! line = ""; } } lines.push(" at " + line); } return %_CallFunction(lines, "\n", ArrayJoin); } function GetTypeName(receiver, requireConstructor) { var constructor = receiver.constructor; if (!constructor) { return requireConstructor ? null : %_CallFunction(receiver, ObjectToString); } var constructorName = constructor.name; if (!constructorName) { return requireConstructor ? null : %_CallFunction(receiver, ObjectToString); } return constructorName; } function captureStackTrace(obj, cons_opt) { var stackTraceLimit = $Error.stackTraceLimit; if (!stackTraceLimit || !IS_NUMBER(stackTraceLimit)) return; if (stackTraceLimit < 0 || stackTraceLimit > 10000) { stackTraceLimit = 10000; } var stack = %CollectStackTrace(obj, cons_opt ? cons_opt : captureStackTrace, stackTraceLimit); var error_string = FormatErrorString(obj); // The holder of this getter ('obj') may not be the receiver ('this'). // When this getter is called the first time, we use the context values to // format a stack trace string and turn this accessor pair into a data // property (on the holder). var getter = function() { // Stack is still a raw array awaiting to be formatted. var result = FormatStackTrace(obj, error_string, GetStackFrames(stack)); // Turn this accessor into a data property. %DefineOrRedefineDataProperty(obj, 'stack', result, NONE); // Release context values. stack = error_string = UNDEFINED; return result; }; // Set the 'stack' property on the receiver. If the receiver is the same as // holder of this setter, the accessor pair is turned into a data property. var setter = function(v) { // Set data property on the receiver (not necessarily holder). %DefineOrRedefineDataProperty(this, 'stack', v, NONE); if (this === obj) { // Release context values if holder is the same as the receiver. stack = error_string = UNDEFINED; } }; %DefineOrRedefineAccessorProperty(obj, 'stack', getter, setter, DONT_ENUM); } function SetUpError() { // Define special error type constructors. var DefineError = function(f) { // Store the error function in both the global object // and the runtime object. The function is fetched // from the runtime object when throwing errors from // within the runtime system to avoid strange side // effects when overwriting the error functions from // user code. var name = f.name; %SetProperty(global, name, f, DONT_ENUM); %SetProperty(builtins, '$' + name, f, DONT_ENUM | DONT_DELETE | READ_ONLY); // Configure the error function. if (name == 'Error') { // The prototype of the Error object must itself be an error. // However, it can't be an instance of the Error object because // it hasn't been properly configured yet. Instead we create a // special not-a-true-error-but-close-enough object. var ErrorPrototype = function() {}; %FunctionSetPrototype(ErrorPrototype, $Object.prototype); %FunctionSetInstanceClassName(ErrorPrototype, 'Error'); %FunctionSetPrototype(f, new ErrorPrototype()); } else { %FunctionSetPrototype(f, new $Error()); } %FunctionSetInstanceClassName(f, 'Error'); %SetProperty(f.prototype, 'constructor', f, DONT_ENUM); %SetProperty(f.prototype, "name", name, DONT_ENUM); %SetCode(f, function(m) { if (%_IsConstructCall()) { // Define all the expected properties directly on the error // object. This avoids going through getters and setters defined // on prototype objects. %IgnoreAttributesAndSetProperty(this, 'stack', UNDEFINED, DONT_ENUM); if (!IS_UNDEFINED(m)) { %IgnoreAttributesAndSetProperty( this, 'message', ToString(m), DONT_ENUM); } captureStackTrace(this, f); } else { return new f(m); } }); %SetNativeFlag(f); }; DefineError(function Error() { }); DefineError(function TypeError() { }); DefineError(function RangeError() { }); DefineError(function SyntaxError() { }); DefineError(function ReferenceError() { }); DefineError(function EvalError() { }); DefineError(function URIError() { }); } SetUpError(); $Error.captureStackTrace = captureStackTrace; %SetProperty($Error.prototype, 'message', '', DONT_ENUM); // Global list of error objects visited during ErrorToString. This is // used to detect cycles in error toString formatting. var visited_errors = new InternalArray(); var cyclic_error_marker = new $Object(); function GetPropertyWithoutInvokingMonkeyGetters(error, name) { var current = error; // Climb the prototype chain until we find the holder. while (current && !%HasLocalProperty(current, name)) { current = %GetPrototype(current); } if (IS_NULL(current)) return UNDEFINED; if (!IS_OBJECT(current)) return error[name]; // If the property is an accessor on one of the predefined errors that can be // generated statically by the compiler, don't touch it. This is to address // http://code.google.com/p/chromium/issues/detail?id=69187 var desc = %GetOwnProperty(current, name); if (desc && desc[IS_ACCESSOR_INDEX]) { var isName = name === "name"; if (current === $ReferenceError.prototype) return isName ? "ReferenceError" : UNDEFINED; if (current === $SyntaxError.prototype) return isName ? "SyntaxError" : UNDEFINED; if (current === $TypeError.prototype) return isName ? "TypeError" : UNDEFINED; } // Otherwise, read normally. return error[name]; } function ErrorToStringDetectCycle(error) { if (!%PushIfAbsent(visited_errors, error)) throw cyclic_error_marker; try { var name = GetPropertyWithoutInvokingMonkeyGetters(error, "name"); name = IS_UNDEFINED(name) ? "Error" : TO_STRING_INLINE(name); var message = GetPropertyWithoutInvokingMonkeyGetters(error, "message"); message = IS_UNDEFINED(message) ? "" : TO_STRING_INLINE(message); if (name === "") return message; if (message === "") return name; return name + ": " + message; } finally { visited_errors.length = visited_errors.length - 1; } } function ErrorToString() { if (!IS_SPEC_OBJECT(this)) { throw MakeTypeError("called_on_non_object", ["Error.prototype.toString"]); } try { return ErrorToStringDetectCycle(this); } catch(e) { // If this error message was encountered already return the empty // string for it instead of recursively formatting it. if (e === cyclic_error_marker) { return ''; } throw e; } } InstallFunctions($Error.prototype, DONT_ENUM, ['toString', ErrorToString]); // Boilerplate for exceptions for stack overflows. Used from // Isolate::StackOverflow(). function SetUpStackOverflowBoilerplate() { var boilerplate = MakeRangeError('stack_overflow', []); var error_string = boilerplate.name + ": " + boilerplate.message; // The raw stack trace is stored as a hidden property on the holder of this // getter, which may not be the same as the receiver. Find the holder to // retrieve the raw stack trace and then turn this accessor pair into a // data property. var getter = function() { var holder = this; while (!IS_ERROR(holder)) { holder = %GetPrototype(holder); if (IS_NULL(holder)) return MakeSyntaxError('illegal_access', []); } var stack = %GetAndClearOverflowedStackTrace(holder); // We may not have captured any stack trace. if (IS_UNDEFINED(stack)) return stack; var result = FormatStackTrace(holder, error_string, GetStackFrames(stack)); // Replace this accessor with a data property. %DefineOrRedefineDataProperty(holder, 'stack', result, NONE); return result; }; // Set the 'stack' property on the receiver. If the receiver is the same as // holder of this setter, the accessor pair is turned into a data property. var setter = function(v) { %DefineOrRedefineDataProperty(this, 'stack', v, NONE); // Tentatively clear the hidden property. If the receiver is the same as // holder, we release the raw stack trace this way. %GetAndClearOverflowedStackTrace(this); }; %DefineOrRedefineAccessorProperty( boilerplate, 'stack', getter, setter, DONT_ENUM); return boilerplate; } var kStackOverflowBoilerplate = SetUpStackOverflowBoilerplate();