fdc7f60f42
Review URL: http://codereview.chromium.org/7736018 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9096 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
1142 lines
42 KiB
JavaScript
1142 lines
42 KiB
JavaScript
// Copyright 2011 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// -------------------------------------------------------------------
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//
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// If this object gets passed to an error constructor the error will
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// get an accessor for .message that constructs a descriptive error
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// message on access.
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const kAddMessageAccessorsMarker = { };
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// This will be lazily initialized when first needed (and forcibly
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// overwritten even though it's const).
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const kMessages = 0;
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function FormatString(format, message) {
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var args = %MessageGetArguments(message);
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var result = "";
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var arg_num = 0;
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for (var i = 0; i < format.length; i++) {
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var str = format[i];
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if (str.length == 2 && %_StringCharCodeAt(str, 0) == 0x25) {
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// Two-char string starts with "%".
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var arg_num = (%_StringCharCodeAt(str, 1) - 0x30) >>> 0;
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if (arg_num < 4) {
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// str is one of %0, %1, %2 or %3.
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try {
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str = ToDetailString(args[arg_num]);
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} catch (e) {
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str = "#<error>";
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}
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}
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}
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result += str;
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}
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return result;
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}
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// To check if something is a native error we need to check the
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// concrete native error types. It is not enough to check "obj
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// instanceof $Error" because user code can replace
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// NativeError.prototype.__proto__. User code cannot replace
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// NativeError.prototype though and therefore this is a safe test.
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function IsNativeErrorObject(obj) {
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return (obj instanceof $Error) ||
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(obj instanceof $EvalError) ||
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(obj instanceof $RangeError) ||
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(obj instanceof $ReferenceError) ||
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(obj instanceof $SyntaxError) ||
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(obj instanceof $TypeError) ||
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(obj instanceof $URIError);
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}
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// When formatting internally created error messages, do not
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// invoke overwritten error toString methods but explicitly use
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// the error to string method. This is to avoid leaking error
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// objects between script tags in a browser setting.
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function ToStringCheckErrorObject(obj) {
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if (IsNativeErrorObject(obj)) {
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return %_CallFunction(obj, errorToString);
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} else {
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return ToString(obj);
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}
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}
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function ToDetailString(obj) {
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if (obj != null && IS_OBJECT(obj) && obj.toString === ObjectToString) {
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var constructor = obj.constructor;
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if (typeof constructor == "function") {
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var constructorName = constructor.name;
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if (IS_STRING(constructorName) && constructorName !== "") {
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return "#<" + constructorName + ">";
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}
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}
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}
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return ToStringCheckErrorObject(obj);
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}
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function MakeGenericError(constructor, type, args) {
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if (IS_UNDEFINED(args)) {
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args = [];
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}
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var e = new constructor(kAddMessageAccessorsMarker);
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e.type = type;
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e.arguments = args;
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return e;
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}
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/**
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* Setup the Script function and constructor.
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*/
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%FunctionSetInstanceClassName(Script, 'Script');
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%SetProperty(Script.prototype, 'constructor', Script, DONT_ENUM);
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%SetCode(Script, function(x) {
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// Script objects can only be created by the VM.
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throw new $Error("Not supported");
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});
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// Helper functions; called from the runtime system.
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function FormatMessage(message) {
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if (kMessages === 0) {
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var messagesDictionary = [
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// Error
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"cyclic_proto", ["Cyclic __proto__ value"],
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"code_gen_from_strings", ["Code generation from strings disallowed for this context"],
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// TypeError
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"unexpected_token", ["Unexpected token ", "%0"],
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"unexpected_token_number", ["Unexpected number"],
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"unexpected_token_string", ["Unexpected string"],
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"unexpected_token_identifier", ["Unexpected identifier"],
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"unexpected_reserved", ["Unexpected reserved word"],
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"unexpected_strict_reserved", ["Unexpected strict mode reserved word"],
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"unexpected_eos", ["Unexpected end of input"],
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"malformed_regexp", ["Invalid regular expression: /", "%0", "/: ", "%1"],
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"unterminated_regexp", ["Invalid regular expression: missing /"],
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"regexp_flags", ["Cannot supply flags when constructing one RegExp from another"],
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"incompatible_method_receiver", ["Method ", "%0", " called on incompatible receiver ", "%1"],
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"invalid_lhs_in_assignment", ["Invalid left-hand side in assignment"],
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"invalid_lhs_in_for_in", ["Invalid left-hand side in for-in"],
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"invalid_lhs_in_postfix_op", ["Invalid left-hand side expression in postfix operation"],
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"invalid_lhs_in_prefix_op", ["Invalid left-hand side expression in prefix operation"],
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"multiple_defaults_in_switch", ["More than one default clause in switch statement"],
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"newline_after_throw", ["Illegal newline after throw"],
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"redeclaration", ["%0", " '", "%1", "' has already been declared"],
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"no_catch_or_finally", ["Missing catch or finally after try"],
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"unknown_label", ["Undefined label '", "%0", "'"],
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"uncaught_exception", ["Uncaught ", "%0"],
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"stack_trace", ["Stack Trace:\n", "%0"],
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"called_non_callable", ["%0", " is not a function"],
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"undefined_method", ["Object ", "%1", " has no method '", "%0", "'"],
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"property_not_function", ["Property '", "%0", "' of object ", "%1", " is not a function"],
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"cannot_convert_to_primitive", ["Cannot convert object to primitive value"],
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"not_constructor", ["%0", " is not a constructor"],
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"not_defined", ["%0", " is not defined"],
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"non_object_property_load", ["Cannot read property '", "%0", "' of ", "%1"],
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"non_object_property_store", ["Cannot set property '", "%0", "' of ", "%1"],
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"non_object_property_call", ["Cannot call method '", "%0", "' of ", "%1"],
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"with_expression", ["%0", " has no properties"],
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"illegal_invocation", ["Illegal invocation"],
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"no_setter_in_callback", ["Cannot set property ", "%0", " of ", "%1", " which has only a getter"],
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"apply_non_function", ["Function.prototype.apply was called on ", "%0", ", which is a ", "%1", " and not a function"],
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"apply_wrong_args", ["Function.prototype.apply: Arguments list has wrong type"],
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"invalid_in_operator_use", ["Cannot use 'in' operator to search for '", "%0", "' in ", "%1"],
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"instanceof_function_expected", ["Expecting a function in instanceof check, but got ", "%0"],
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"instanceof_nonobject_proto", ["Function has non-object prototype '", "%0", "' in instanceof check"],
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"null_to_object", ["Cannot convert null to object"],
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"reduce_no_initial", ["Reduce of empty array with no initial value"],
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"getter_must_be_callable", ["Getter must be a function: ", "%0"],
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"setter_must_be_callable", ["Setter must be a function: ", "%0"],
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"value_and_accessor", ["Invalid property. A property cannot both have accessors and be writable or have a value, ", "%0"],
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"proto_object_or_null", ["Object prototype may only be an Object or null"],
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"property_desc_object", ["Property description must be an object: ", "%0"],
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"redefine_disallowed", ["Cannot redefine property: ", "%0"],
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"define_disallowed", ["Cannot define property:", "%0", ", object is not extensible."],
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"non_extensible_proto", ["%0", " is not extensible"],
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"handler_non_object", ["Proxy.", "%0", " called with non-object as handler"],
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"handler_trap_missing", ["Proxy handler ", "%0", " has no '", "%1", "' trap"],
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"handler_trap_must_be_callable", ["Proxy handler ", "%0", " has non-callable '", "%1", "' trap"],
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"handler_returned_false", ["Proxy handler ", "%0", " returned false for '", "%1", "' trap"],
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"handler_returned_undefined", ["Proxy handler ", "%0", " returned undefined for '", "%1", "' trap"],
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"proxy_prop_not_configurable", ["Trap ", "%1", " of proxy handler ", "%0", " returned non-configurable descriptor for property ", "%2"],
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"proxy_non_object_prop_names", ["Trap ", "%1", " returned non-object ", "%0"],
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"proxy_repeated_prop_name", ["Trap ", "%1", " returned repeated property name ", "%2"],
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"invalid_weakmap_key", ["Invalid value used as weak map key"],
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// RangeError
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"invalid_array_length", ["Invalid array length"],
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"stack_overflow", ["Maximum call stack size exceeded"],
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// SyntaxError
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"unable_to_parse", ["Parse error"],
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"invalid_regexp_flags", ["Invalid flags supplied to RegExp constructor '", "%0", "'"],
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"invalid_regexp", ["Invalid RegExp pattern /", "%0", "/"],
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"illegal_break", ["Illegal break statement"],
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"illegal_continue", ["Illegal continue statement"],
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"illegal_return", ["Illegal return statement"],
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"error_loading_debugger", ["Error loading debugger"],
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"no_input_to_regexp", ["No input to ", "%0"],
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"invalid_json", ["String '", "%0", "' is not valid JSON"],
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"circular_structure", ["Converting circular structure to JSON"],
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"obj_ctor_property_non_object", ["Object.", "%0", " called on non-object"],
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"called_on_null_or_undefined", ["%0", " called on null or undefined"],
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"array_indexof_not_defined", ["Array.getIndexOf: Argument undefined"],
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"object_not_extensible", ["Can't add property ", "%0", ", object is not extensible"],
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"illegal_access", ["Illegal access"],
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"invalid_preparser_data", ["Invalid preparser data for function ", "%0"],
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"strict_mode_with", ["Strict mode code may not include a with statement"],
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"strict_catch_variable", ["Catch variable may not be eval or arguments in strict mode"],
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"too_many_arguments", ["Too many arguments in function call (only 32766 allowed)"],
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"too_many_parameters", ["Too many parameters in function definition (only 32766 allowed)"],
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"too_many_variables", ["Too many variables declared (only 32767 allowed)"],
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"strict_param_name", ["Parameter name eval or arguments is not allowed in strict mode"],
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"strict_param_dupe", ["Strict mode function may not have duplicate parameter names"],
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"strict_var_name", ["Variable name may not be eval or arguments in strict mode"],
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"strict_function_name", ["Function name may not be eval or arguments in strict mode"],
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"strict_octal_literal", ["Octal literals are not allowed in strict mode."],
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"strict_duplicate_property", ["Duplicate data property in object literal not allowed in strict mode"],
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"accessor_data_property", ["Object literal may not have data and accessor property with the same name"],
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"accessor_get_set", ["Object literal may not have multiple get/set accessors with the same name"],
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"strict_lhs_assignment", ["Assignment to eval or arguments is not allowed in strict mode"],
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"strict_lhs_postfix", ["Postfix increment/decrement may not have eval or arguments operand in strict mode"],
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"strict_lhs_prefix", ["Prefix increment/decrement may not have eval or arguments operand in strict mode"],
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"strict_reserved_word", ["Use of future reserved word in strict mode"],
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"strict_delete", ["Delete of an unqualified identifier in strict mode."],
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"strict_delete_property", ["Cannot delete property '", "%0", "' of ", "%1"],
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"strict_const", ["Use of const in strict mode."],
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"strict_function", ["In strict mode code, functions can only be declared at top level or immediately within another function." ],
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"strict_read_only_property", ["Cannot assign to read only property '", "%0", "' of ", "%1"],
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"strict_cannot_assign", ["Cannot assign to read only '", "%0", "' in strict mode"],
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"strict_poison_pill", ["'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them"],
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"strict_caller", ["Illegal access to a strict mode caller function."],
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"unprotected_let", ["Illegal let declaration in unprotected statement context."],
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];
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var messages = { __proto__ : null };
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var desc = new PropertyDescriptor();
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desc.setConfigurable(false);
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desc.setEnumerable(false);
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desc.setWritable(false);
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for (var i = 0; i < messagesDictionary.length; i += 2) {
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var key = messagesDictionary[i];
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var format = messagesDictionary[i + 1];
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ObjectFreeze(format);
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desc.setValue(format);
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DefineOwnProperty(messages, key, desc);
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}
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%PreventExtensions(messages);
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%IgnoreAttributesAndSetProperty(builtins, "kMessages",
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messages,
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DONT_DELETE | DONT_ENUM | READ_ONLY);
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}
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var message_type = %MessageGetType(message);
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var format = kMessages[message_type];
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if (!format) return "<unknown message " + message_type + ">";
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return FormatString(format, message);
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}
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function GetLineNumber(message) {
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var start_position = %MessageGetStartPosition(message);
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if (start_position == -1) return kNoLineNumberInfo;
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var script = %MessageGetScript(message);
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var location = script.locationFromPosition(start_position, true);
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if (location == null) return kNoLineNumberInfo;
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return location.line + 1;
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}
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// Returns the source code line containing the given source
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// position, or the empty string if the position is invalid.
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function GetSourceLine(message) {
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var script = %MessageGetScript(message);
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var start_position = %MessageGetStartPosition(message);
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var location = script.locationFromPosition(start_position, true);
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if (location == null) return "";
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location.restrict();
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return location.sourceText();
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}
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function MakeTypeError(type, args) {
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return MakeGenericError($TypeError, type, args);
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}
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function MakeRangeError(type, args) {
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return MakeGenericError($RangeError, type, args);
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}
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function MakeSyntaxError(type, args) {
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return MakeGenericError($SyntaxError, type, args);
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}
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function MakeReferenceError(type, args) {
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return MakeGenericError($ReferenceError, type, args);
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}
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function MakeEvalError(type, args) {
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return MakeGenericError($EvalError, type, args);
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}
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function MakeError(type, args) {
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return MakeGenericError($Error, type, args);
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}
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/**
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* Find a line number given a specific source position.
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* @param {number} position The source position.
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* @return {number} 0 if input too small, -1 if input too large,
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else the line number.
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*/
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Script.prototype.lineFromPosition = function(position) {
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var lower = 0;
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var upper = this.lineCount() - 1;
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var line_ends = this.line_ends;
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// We'll never find invalid positions so bail right away.
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if (position > line_ends[upper]) {
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return -1;
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}
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// This means we don't have to safe-guard indexing line_ends[i - 1].
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if (position <= line_ends[0]) {
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return 0;
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}
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// Binary search to find line # from position range.
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while (upper >= 1) {
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var i = (lower + upper) >> 1;
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if (position > line_ends[i]) {
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lower = i + 1;
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} else if (position <= line_ends[i - 1]) {
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upper = i - 1;
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} else {
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return i;
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}
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}
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return -1;
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}
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/**
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* Get information on a specific source position.
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* @param {number} position The source position
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* @param {boolean} include_resource_offset Set to true to have the resource
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* offset added to the location
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* @return {SourceLocation}
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* If line is negative or not in the source null is returned.
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*/
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Script.prototype.locationFromPosition = function (position,
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include_resource_offset) {
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var line = this.lineFromPosition(position);
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if (line == -1) return null;
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// Determine start, end and column.
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var line_ends = this.line_ends;
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var start = line == 0 ? 0 : line_ends[line - 1] + 1;
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var end = line_ends[line];
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if (end > 0 && %_CallFunction(this.source, end - 1, StringCharAt) == '\r') end--;
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var column = position - start;
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// Adjust according to the offset within the resource.
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if (include_resource_offset) {
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line += this.line_offset;
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if (line == this.line_offset) {
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column += this.column_offset;
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}
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}
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return new SourceLocation(this, position, line, column, start, end);
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};
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/**
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* Get information on a specific source line and column possibly offset by a
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* fixed source position. This function is used to find a source position from
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* a line and column position. The fixed source position offset is typically
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* used to find a source position in a function based on a line and column in
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* the source for the function alone. The offset passed will then be the
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* start position of the source for the function within the full script source.
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* @param {number} opt_line The line within the source. Default value is 0
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* @param {number} opt_column The column in within the line. Default value is 0
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* @param {number} opt_offset_position The offset from the begining of the
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* source from where the line and column calculation starts. Default value is 0
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* @return {SourceLocation}
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* If line is negative or not in the source null is returned.
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*/
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Script.prototype.locationFromLine = function (opt_line, opt_column, opt_offset_position) {
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// Default is the first line in the script. Lines in the script is relative
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// to the offset within the resource.
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var line = 0;
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if (!IS_UNDEFINED(opt_line)) {
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line = opt_line - this.line_offset;
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}
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// Default is first column. If on the first line add the offset within the
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// resource.
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var column = opt_column || 0;
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if (line == 0) {
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column -= this.column_offset
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}
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var offset_position = opt_offset_position || 0;
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if (line < 0 || column < 0 || offset_position < 0) return null;
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if (line == 0) {
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return this.locationFromPosition(offset_position + column, false);
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} else {
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// Find the line where the offset position is located.
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var offset_line = this.lineFromPosition(offset_position);
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if (offset_line == -1 || offset_line + line >= this.lineCount()) {
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return null;
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}
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return this.locationFromPosition(this.line_ends[offset_line + line - 1] + 1 + column); // line > 0 here.
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}
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}
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/**
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* Get a slice of source code from the script. The boundaries for the slice is
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* specified in lines.
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* @param {number} opt_from_line The first line (zero bound) in the slice.
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* Default is 0
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* @param {number} opt_to_column The last line (zero bound) in the slice (non
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* inclusive). Default is the number of lines in the script
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* @return {SourceSlice} The source slice or null of the parameters where
|
|
* invalid
|
|
*/
|
|
Script.prototype.sourceSlice = function (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);
|
|
}
|
|
|
|
|
|
Script.prototype.sourceLine = function (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.
|
|
*/
|
|
Script.prototype.lineCount = function() {
|
|
// 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.
|
|
*/
|
|
Script.prototype.nameOrSourceURL = function() {
|
|
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;
|
|
}
|
|
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
|
|
SourceLocation.prototype.__proto__ = null;
|
|
|
|
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
|
|
*/
|
|
SourceLocation.prototype.restrict = function (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.
|
|
*/
|
|
SourceLocation.prototype.sourceText = function () {
|
|
return %_CallFunction(this.script.source, this.start, this.end, StringSubstring);
|
|
};
|
|
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
|
|
SourceSlice.prototype.__proto__ = null;
|
|
|
|
/**
|
|
* 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)
|
|
*/
|
|
SourceSlice.prototype.sourceText = function () {
|
|
return %_CallFunction(this.script.source,
|
|
this.from_position,
|
|
this.to_position,
|
|
StringSubstring);
|
|
};
|
|
|
|
|
|
// 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;
|
|
}
|
|
|
|
CallSite.prototype.__proto__ = null;
|
|
|
|
CallSite.prototype.getThis = function () {
|
|
return this.receiver;
|
|
};
|
|
|
|
CallSite.prototype.getTypeName = function () {
|
|
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;
|
|
};
|
|
|
|
CallSite.prototype.isToplevel = function () {
|
|
if (this.receiver == null) {
|
|
return true;
|
|
}
|
|
return IS_GLOBAL(this.receiver);
|
|
};
|
|
|
|
CallSite.prototype.isEval = function () {
|
|
var script = %FunctionGetScript(this.fun);
|
|
return script && script.compilation_type == COMPILATION_TYPE_EVAL;
|
|
};
|
|
|
|
CallSite.prototype.getEvalOrigin = function () {
|
|
var script = %FunctionGetScript(this.fun);
|
|
return FormatEvalOrigin(script);
|
|
};
|
|
|
|
CallSite.prototype.getScriptNameOrSourceURL = function () {
|
|
var script = %FunctionGetScript(this.fun);
|
|
return script ? script.nameOrSourceURL() : null;
|
|
};
|
|
|
|
CallSite.prototype.getFunction = function () {
|
|
return this.fun;
|
|
};
|
|
|
|
CallSite.prototype.getFunctionName = function () {
|
|
// 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;
|
|
};
|
|
|
|
CallSite.prototype.getMethodName = function () {
|
|
// 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;
|
|
};
|
|
|
|
CallSite.prototype.getFileName = function () {
|
|
var script = %FunctionGetScript(this.fun);
|
|
return script ? script.name : null;
|
|
};
|
|
|
|
CallSite.prototype.getLineNumber = function () {
|
|
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;
|
|
};
|
|
|
|
CallSite.prototype.getColumnNumber = function () {
|
|
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;
|
|
};
|
|
|
|
CallSite.prototype.isNative = function () {
|
|
var script = %FunctionGetScript(this.fun);
|
|
return script ? (script.type == TYPE_NATIVE) : false;
|
|
};
|
|
|
|
CallSite.prototype.getPosition = function () {
|
|
return this.pos;
|
|
};
|
|
|
|
CallSite.prototype.isConstructor = function () {
|
|
var constructor = this.receiver ? this.receiver.constructor : null;
|
|
if (!constructor) {
|
|
return false;
|
|
}
|
|
return this.fun === constructor;
|
|
};
|
|
|
|
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 = $Error.stackTraceLimit;
|
|
if (!stackTraceLimit || !IS_NUMBER(stackTraceLimit)) return;
|
|
if (stackTraceLimit < 0 || stackTraceLimit > 10000) {
|
|
stackTraceLimit = 10000;
|
|
}
|
|
var raw_stack = %CollectStackTrace(cons_opt
|
|
? cons_opt
|
|
: captureStackTrace, stackTraceLimit);
|
|
DefineOneShotAccessor(obj, 'stack', function (obj) {
|
|
return FormatRawStackTrace(obj, raw_stack);
|
|
});
|
|
};
|
|
|
|
|
|
(function () {
|
|
// Define special error type constructors.
|
|
|
|
function DefineError(f) {
|
|
// Store the error function in both the global object
|
|
// and the runtime object. The function is fetched
|
|
// from the runtime object when throwing errors from
|
|
// within the runtime system to avoid strange side
|
|
// effects when overwriting the error functions from
|
|
// user code.
|
|
var name = f.name;
|
|
%SetProperty(global, name, f, DONT_ENUM);
|
|
%SetProperty(builtins, '$' + 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() { });
|
|
})();
|
|
|
|
$Error.captureStackTrace = captureStackTrace;
|
|
|
|
%SetProperty($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', []);
|