// Copyright 2011 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. // ------------------------------------------------------------------- // // If this object gets passed to an error constructor the error will // get an accessor for .message that constructs a descriptive error // message on access. const kAddMessageAccessorsMarker = { }; // This will be lazily initialized when first needed (and forcibly // overwritten even though it's const). const kMessages = 0; function FormatString(format, message) { var args = %MessageGetArguments(message); 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 = ToDetailString(args[arg_num]); } catch (e) { str = "#<error>"; } } } result += str; } return result; } // To check if something is a native error we need to check the // concrete native error types. It is not enough to check "obj // instanceof $Error" because user code can replace // NativeError.prototype.__proto__. User code cannot replace // NativeError.prototype though and therefore this is a safe test. function IsNativeErrorObject(obj) { return (obj instanceof $Error) || (obj instanceof $EvalError) || (obj instanceof $RangeError) || (obj instanceof $ReferenceError) || (obj instanceof $SyntaxError) || (obj instanceof $TypeError) || (obj instanceof $URIError); } // 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 (IsNativeErrorObject(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 = []; } var e = new constructor(kAddMessageAccessorsMarker); e.type = type; e.arguments = args; return e; } /** * 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(message) { if (kMessages === 0) { var messagesDictionary = [ // Error "cyclic_proto", ["Cyclic __proto__ value"], "code_gen_from_strings", ["Code generation from strings disallowed for this context"], // 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"], "invalid_lhs_in_assignment", ["Invalid left-hand side in assignment"], "invalid_lhs_in_for_in", ["Invalid left-hand side in for-in"], "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"], "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"], "non_object_property_call", ["Cannot call method '", "%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"], "null_to_object", ["Cannot convert 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"], "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"], "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 for '", "%1", "' trap"], "handler_returned_undefined", ["Proxy handler ", "%0", " returned undefined for '", "%1", "' trap"], "proxy_prop_not_configurable", ["Trap ", "%1", " of proxy handler ", "%0", " returned non-configurable descriptor for property ", "%2"], "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"], // RangeError "invalid_array_length", ["Invalid array length"], "stack_overflow", ["Maximum call stack size exceeded"], // SyntaxError "unable_to_parse", ["Parse error"], "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"], "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"], "obj_ctor_property_non_object", ["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_catch_variable", ["Catch variable may not be eval or arguments in strict mode"], "too_many_arguments", ["Too many arguments in function call (only 32766 allowed)"], "too_many_parameters", ["Too many parameters in function definition (only 32766 allowed)"], "too_many_variables", ["Too many variables declared (only 32767 allowed)"], "strict_param_name", ["Parameter name eval or arguments is not allowed in strict mode"], "strict_param_dupe", ["Strict mode function may not have duplicate parameter names"], "strict_var_name", ["Variable name may not be eval or arguments in strict mode"], "strict_function_name", ["Function name may not be eval or arguments in strict mode"], "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_lhs_assignment", ["Assignment to eval or arguments is not allowed in strict mode"], "strict_lhs_postfix", ["Postfix increment/decrement may not have eval or arguments operand in strict mode"], "strict_lhs_prefix", ["Prefix increment/decrement may not have eval or arguments operand in strict mode"], "strict_reserved_word", ["Use of future reserved word in strict mode"], "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."], ]; var messages = { __proto__ : null }; var desc = new PropertyDescriptor(); desc.setConfigurable(false); desc.setEnumerable(false); desc.setWritable(false); for (var i = 0; i < messagesDictionary.length; i += 2) { var key = messagesDictionary[i]; var format = messagesDictionary[i + 1]; ObjectFreeze(format); desc.setValue(format); DefineOwnProperty(messages, key, desc); } %PreventExtensions(messages); %IgnoreAttributesAndSetProperty(builtins, "kMessages", messages, DONT_DELETE | DONT_ENUM | READ_ONLY); } var message_type = %MessageGetType(message); var format = kMessages[message_type]; if (!format) return "<unknown message " + message_type + ">"; return FormatString(format, message); } 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; }; /** * Returns the name of script if available, contents of sourceURL comment * otherwise. See * http://fbug.googlecode.com/svn/branches/firebug1.1/docs/ReleaseNotes_1.1.txt * for details on using //@ sourceURL comment to identify scritps that don't * have name. * * @return {?string} script name if present, value for //@ sourceURL comment * otherwise. */ function ScriptNameOrSourceURL() { if (this.name) { return this.name; } // 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); 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) { return SubString(source, matchInfo[CAPTURE(2)], matchInfo[CAPTURE(3)]); } } return this.name; } SetUpLockedPrototype(Script, $Array("source", "name", "line_ends", "line_offset", "column_offset"), $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; } const 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 FormatSourcePosition(new CallSite(recv, fun, pos)); } // ---------------------------------------------------------------------------- // Error implementation // Defines accessors for a property that is calculated the first time // the property is read. function DefineOneShotAccessor(obj, name, fun) { // Note that the accessors consistently operate on 'obj', not 'this'. // Since the object may occur in someone else's prototype chain we // can't rely on 'this' being the same as 'obj'. var hasBeenSet = false; var value; function getter() { if (hasBeenSet) { return value; } hasBeenSet = true; value = fun(obj); return value; } function setter(v) { hasBeenSet = true; value = v; } var desc = { get: getter, set: setter, enumerable: false, configurable: true }; desc = ToPropertyDescriptor(desc); DefineOwnProperty(obj, name, desc, true); } function CallSite(receiver, fun, pos) { this.receiver = receiver; this.fun = fun; this.pos = pos; } function CallSiteGetThis() { return this.receiver; }; function CallSiteGetTypeName() { var constructor = this.receiver.constructor; if (!constructor) { return %_CallFunction(this.receiver, ObjectToString); } var constructorName = constructor.name; if (!constructorName) { return %_CallFunction(this.receiver, ObjectToString); } return constructorName; }; function CallSiteIsToplevel() { if (this.receiver == null) { return true; } return IS_GLOBAL(this.receiver); }; function CallSiteIsEval() { var script = %FunctionGetScript(this.fun); return script && script.compilation_type == COMPILATION_TYPE_EVAL; }; function CallSiteGetEvalOrigin() { var script = %FunctionGetScript(this.fun); return FormatEvalOrigin(script); }; function CallSiteGetScriptNameOrSourceURL() { var script = %FunctionGetScript(this.fun); return script ? script.nameOrSourceURL() : null; }; function CallSiteGetFunction() { return this.fun; }; function CallSiteGetFunctionName() { // See if the function knows its own name var name = this.fun.name; if (name) { return name; } else { return %FunctionGetInferredName(this.fun); } // Maybe this is an evaluation? var script = %FunctionGetScript(this.fun); 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 ownName = this.fun.name; if (ownName && this.receiver && (%_CallFunction(this.receiver, ownName, ObjectLookupGetter) === this.fun || %_CallFunction(this.receiver, ownName, ObjectLookupSetter) === this.fun || this.receiver[ownName] === this.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 this.receiver) { if (this.receiver.__lookupGetter__(prop) === this.fun || this.receiver.__lookupSetter__(prop) === this.fun || (!this.receiver.__lookupGetter__(prop) && this.receiver[prop] === this.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(this.fun); return script ? script.name : null; }; function CallSiteGetLineNumber() { if (this.pos == -1) { return null; } var script = %FunctionGetScript(this.fun); var location = null; if (script) { location = script.locationFromPosition(this.pos, true); } return location ? location.line + 1 : null; }; function CallSiteGetColumnNumber() { if (this.pos == -1) { return null; } var script = %FunctionGetScript(this.fun); var location = null; if (script) { location = script.locationFromPosition(this.pos, true); } return location ? location.column + 1: null; }; function CallSiteIsNative() { var script = %FunctionGetScript(this.fun); return script ? (script.type == TYPE_NATIVE) : false; }; function CallSiteGetPosition() { return this.pos; }; function CallSiteIsConstructor() { var constructor = this.receiver ? this.receiver.constructor : null; if (!constructor) { return false; } return this.fun === constructor; }; 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 )); 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 += "<anonymous>"; } 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 FormatSourcePosition(frame) { var fileName; var fileLocation = ""; if (frame.isNative()) { fileLocation = "native"; } else if (frame.isEval()) { fileName = frame.getScriptNameOrSourceURL(); if (!fileName) fileLocation = frame.getEvalOrigin(); } else { fileName = frame.getFileName(); } if (fileName) { fileLocation += fileName; var lineNumber = frame.getLineNumber(); if (lineNumber != null) { fileLocation += ":" + lineNumber; var columnNumber = frame.getColumnNumber(); if (columnNumber) { fileLocation += ":" + columnNumber; } } } if (!fileLocation) { fileLocation = "unknown source"; } var line = ""; var functionName = frame.getFunction().name; var addPrefix = true; var isConstructor = frame.isConstructor(); var isMethodCall = !(frame.isToplevel() || isConstructor); if (isMethodCall) { var methodName = frame.getMethodName(); line += frame.getTypeName() + "."; if (functionName) { line += functionName; if (methodName && (methodName != functionName)) { line += " [as " + methodName + "]"; } } else { line += methodName || "<anonymous>"; } } else if (isConstructor) { line += "new " + (functionName || "<anonymous>"); } else if (functionName) { line += functionName; } else { line += fileLocation; addPrefix = false; } if (addPrefix) { line += " (" + fileLocation + ")"; } return line; } function FormatStackTrace(error, frames) { var lines = []; try { lines.push(error.toString()); } catch (e) { try { lines.push("<error: " + e + ">"); } catch (ee) { lines.push("<error>"); } } for (var i = 0; i < frames.length; i++) { var frame = frames[i]; var line; try { line = FormatSourcePosition(frame); } catch (e) { try { line = "<error: " + e + ">"; } catch (ee) { // Any code that reaches this point is seriously nasty! line = "<error>"; } } lines.push(" at " + line); } return lines.join("\n"); } function FormatRawStackTrace(error, raw_stack) { var frames = [ ]; for (var i = 0; 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); frames.push(new CallSite(recv, fun, pos)); } if (IS_FUNCTION($Error.prepareStackTrace)) { return $Error.prepareStackTrace(error, frames); } else { return FormatStackTrace(error, frames); } } function captureStackTrace(obj, cons_opt) { var stackTraceLimit = $Error.stackTraceLimit; if (!stackTraceLimit || !IS_NUMBER(stackTraceLimit)) return; if (stackTraceLimit < 0 || stackTraceLimit > 10000) { stackTraceLimit = 10000; } var raw_stack = %CollectStackTrace(cons_opt ? cons_opt : captureStackTrace, stackTraceLimit); DefineOneShotAccessor(obj, 'stack', function (obj) { return FormatRawStackTrace(obj, raw_stack); }); }; function SetUpError() { // Define special error type constructors. function DefineError(f) { // Store the error function in both the global object // and the runtime object. The function is fetched // from the runtime object when throwing errors from // within the runtime system to avoid strange side // effects when overwriting the error functions from // user code. var name = f.name; %SetProperty(global, name, f, DONT_ENUM); %SetProperty(builtins, '$' + 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. function ErrorPrototype() {} %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); // The name property on the prototype of error objects is not // specified as being read-one and dont-delete. However, allowing // overwriting allows leaks of error objects between script blocks // in the same context in a browser setting. Therefore we fix the // name. %SetProperty(f.prototype, "name", name, DONT_ENUM | DONT_DELETE | READ_ONLY) ; %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', void 0, DONT_ENUM); %IgnoreAttributesAndSetProperty(this, 'arguments', void 0, DONT_ENUM); %IgnoreAttributesAndSetProperty(this, 'type', void 0, DONT_ENUM); if (m === kAddMessageAccessorsMarker) { // DefineOneShotAccessor always inserts a message property and // ignores setters. DefineOneShotAccessor(this, 'message', function (obj) { return FormatMessage(%NewMessageObject(obj.type, obj.arguments)); }); } else if (!IS_UNDEFINED(m)) { %IgnoreAttributesAndSetProperty(this, 'message', ToString(m), DONT_ENUM); } captureStackTrace(this, f); } else { return new f(m); } }); } 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. const visited_errors = new InternalArray(); const cyclic_error_marker = new $Object(); function errorToStringDetectCycle(error) { if (!%PushIfAbsent(visited_errors, error)) throw cyclic_error_marker; try { var type = error.type; var hasMessage = %_CallFunction(error, "message", ObjectHasOwnProperty); if (type && !hasMessage) { var formatted = FormatMessage(%NewMessageObject(type, error.arguments)); return error.name + ": " + formatted; } var message = hasMessage ? (": " + error.message) : ""; return error.name + message; } finally { visited_errors.length = visited_errors.length - 1; } } function errorToString() { if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) { throw MakeTypeError("called_on_null_or_undefined", ["Error.prototype.toString"]); } // This helper function is needed because access to properties on // the builtins object do not work inside of a catch clause. function isCyclicErrorMarker(o) { return o === cyclic_error_marker; } try { return errorToStringDetectCycle(this); } catch(e) { // If this error message was encountered already return the empty // string for it instead of recursively formatting it. if (isCyclicErrorMarker(e)) { return ''; } throw e; } } InstallFunctions($Error.prototype, DONT_ENUM, ['toString', errorToString]); // Boilerplate for exceptions for stack overflows. Used from // Isolate::StackOverflow(). const kStackOverflowBoilerplate = MakeRangeError('stack_overflow', []);