Javascript
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1308行
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48.45 KB
// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// -------------------------------------------------------------------
var kMessages = {
// Error
cyclic_proto: ["Cyclic __proto__ value"],
code_gen_from_strings: ["%0"],
constructor_special_method: ["Class constructor may not be an accessor"],
generator_running: ["Generator is already running"],
generator_finished: ["Generator has already finished"],
// TypeError
unexpected_token: ["Unexpected token ", "%0"],
unexpected_token_number: ["Unexpected number"],
unexpected_token_string: ["Unexpected string"],
unexpected_token_identifier: ["Unexpected identifier"],
unexpected_reserved: ["Unexpected reserved word"],
unexpected_strict_reserved: ["Unexpected strict mode reserved word"],
unexpected_eos: ["Unexpected end of input"],
malformed_regexp: ["Invalid regular expression: /", "%0", "/: ", "%1"],
unterminated_regexp: ["Invalid regular expression: missing /"],
regexp_flags: ["Cannot supply flags when constructing one RegExp from another"],
incompatible_method_receiver: ["Method ", "%0", " called on incompatible receiver ", "%1"],
multiple_defaults_in_switch: ["More than one default clause in switch statement"],
newline_after_throw: ["Illegal newline after throw"],
label_redeclaration: ["Label '", "%0", "' has already been declared"],
var_redeclaration: ["Identifier '", "%0", "' has already been declared"],
duplicate_template_property: ["Object template has duplicate property '", "%0", "'"],
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_method: ["'super' is referenced from non-method"],
unsupported_super: ["Unsupported reference to 'super'"],
non_object_property_load: ["Cannot read property '", "%0", "' of ", "%1"],
non_object_property_store: ["Cannot set property '", "%0", "' of ", "%1"],
with_expression: ["%0", " has no properties"],
illegal_invocation: ["Illegal invocation"],
no_setter_in_callback: ["Cannot set property ", "%0", " of ", "%1", " which has only a getter"],
apply_non_function: ["Function.prototype.apply was called on ", "%0", ", which is a ", "%1", " and not a function"],
apply_wrong_args: ["Function.prototype.apply: Arguments list has wrong type"],
toMethod_non_function: ["Function.prototype.toMethod was called on ", "%0", ", which is a ", "%1", " and not a function"],
toMethod_non_object: ["Function.prototype.toMethod: home object ", "%0", " is not an object"],
invalid_in_operator_use: ["Cannot use 'in' operator to search for '", "%0", "' in ", "%1"],
instanceof_function_expected: ["Expecting a function in instanceof check, but got ", "%0"],
instanceof_nonobject_proto: ["Function has non-object prototype '", "%0", "' in instanceof check"],
undefined_or_null_to_object: ["Cannot convert undefined or null to object"],
reduce_no_initial: ["Reduce of empty array with no initial value"],
getter_must_be_callable: ["Getter must be a function: ", "%0"],
setter_must_be_callable: ["Setter must be a function: ", "%0"],
value_and_accessor: ["Invalid property. A property cannot both have accessors and be writable or have a value, ", "%0"],
proto_object_or_null: ["Object prototype may only be an Object or null: ", "%0"],
property_desc_object: ["Property description must be an object: ", "%0"],
redefine_disallowed: ["Cannot redefine property: ", "%0"],
define_disallowed: ["Cannot define property:", "%0", ", object is not extensible."],
non_extensible_proto: ["%0", " is not extensible"],
handler_non_object: ["Proxy.", "%0", " called with non-object as handler"],
proto_non_object: ["Proxy.", "%0", " called with non-object as prototype"],
trap_function_expected: ["Proxy.", "%0", " called with non-function for '", "%1", "' trap"],
handler_trap_missing: ["Proxy handler ", "%0", " has no '", "%1", "' trap"],
handler_trap_must_be_callable: ["Proxy handler ", "%0", " has non-callable '", "%1", "' trap"],
handler_returned_false: ["Proxy handler ", "%0", " returned false from '", "%1", "' trap"],
handler_returned_undefined: ["Proxy handler ", "%0", " returned undefined from '", "%1", "' trap"],
proxy_prop_not_configurable: ["Proxy handler ", "%0", " returned non-configurable descriptor for property '", "%2", "' from '", "%1", "' trap"],
proxy_non_object_prop_names: ["Trap '", "%1", "' returned non-object ", "%0"],
proxy_repeated_prop_name: ["Trap '", "%1", "' returned repeated property name '", "%2", "'"],
invalid_weakmap_key: ["Invalid value used as weak map key"],
invalid_weakset_value: ["Invalid value used in weak set"],
not_date_object: ["this is not a Date object."],
observe_non_object: ["Object.", "%0", " cannot ", "%0", " non-object"],
observe_non_function: ["Object.", "%0", " cannot deliver to non-function"],
observe_callback_frozen: ["Object.observe cannot deliver to a frozen function object"],
observe_invalid_accept: ["Object.observe accept must be an array of strings."],
observe_type_non_string: ["Invalid changeRecord with non-string 'type' property"],
observe_perform_non_string: ["Invalid non-string changeType"],
observe_perform_non_function: ["Cannot perform non-function"],
observe_notify_non_notifier: ["notify called on non-notifier object"],
observe_global_proxy: ["%0", " cannot be called on the global proxy object"],
not_typed_array: ["this is not a typed array."],
invalid_argument: ["invalid_argument"],
data_view_not_array_buffer: ["First argument to DataView constructor must be an ArrayBuffer"],
constructor_not_function: ["Constructor ", "%0", " requires 'new'"],
not_a_symbol: ["%0", " is not a symbol"],
not_a_promise: ["%0", " is not a promise"],
resolver_not_a_function: ["Promise resolver ", "%0", " is not a function"],
promise_cyclic: ["Chaining cycle detected for promise ", "%0"],
array_functions_on_frozen: ["Cannot modify frozen array elements"],
array_functions_change_sealed: ["Cannot add/remove sealed array elements"],
first_argument_not_regexp: ["First argument to ", "%0", " must not be a regular expression"],
not_iterable: ["%0", " is not iterable"],
not_an_iterator: ["%0", " is not an iterator"],
iterator_result_not_an_object: ["Iterator result ", "%0", " is not an object"],
iterator_value_not_an_object: ["Iterator value ", "%0", " is not an entry object"],
// RangeError
invalid_array_length: ["Invalid array length"],
invalid_array_buffer_length: ["Invalid array buffer length"],
invalid_string_length: ["Invalid string length"],
invalid_typed_array_offset: ["Start offset is too large:"],
invalid_typed_array_length: ["Invalid typed array length"],
invalid_typed_array_alignment: ["%0", " of ", "%1", " should be a multiple of ", "%2"],
typed_array_set_source_too_large:
["Source is too large"],
typed_array_set_negative_offset:
["Start offset is negative"],
invalid_data_view_offset: ["Start offset is outside the bounds of the buffer"],
invalid_data_view_length: ["Invalid data view length"],
invalid_data_view_accessor_offset:
["Offset is outside the bounds of the DataView"],
stack_overflow: ["Maximum call stack size exceeded"],
invalid_time_value: ["Invalid time value"],
invalid_count_value: ["Invalid count value"],
invalid_code_point: ["Invalid code point ", "%0"],
// ReferenceError
invalid_lhs_in_assignment: ["Invalid left-hand side in assignment"],
invalid_lhs_in_for: ["Invalid left-hand side in for-loop"],
invalid_lhs_in_postfix_op: ["Invalid left-hand side expression in postfix operation"],
invalid_lhs_in_prefix_op: ["Invalid left-hand side expression in prefix operation"],
// SyntaxError
paren_in_arg_string: ["Function arg string contains parenthesis"],
not_isvar: ["builtin %IS_VAR: not a variable"],
single_function_literal: ["Single function literal required"],
invalid_regexp_flags: ["Invalid flags supplied to RegExp constructor '", "%0", "'"],
invalid_regexp: ["Invalid RegExp pattern /", "%0", "/"],
illegal_break: ["Illegal break statement"],
illegal_continue: ["Illegal continue statement"],
illegal_return: ["Illegal return statement"],
error_loading_debugger: ["Error loading debugger"],
no_input_to_regexp: ["No input to ", "%0"],
invalid_json: ["String '", "%0", "' is not valid JSON"],
circular_structure: ["Converting circular structure to JSON"],
called_on_non_object: ["%0", " called on non-object"],
called_on_null_or_undefined: ["%0", " called on null or undefined"],
array_indexof_not_defined: ["Array.getIndexOf: Argument undefined"],
object_not_extensible: ["Can't add property ", "%0", ", object is not extensible"],
illegal_access: ["Illegal access"],
static_prototype: ["Classes may not have static property named prototype"],
strict_mode_with: ["Strict mode code may not include a with statement"],
strict_eval_arguments: ["Unexpected eval or arguments in strict mode"],
too_many_arguments: ["Too many arguments in function call (only 65535 allowed)"],
too_many_parameters: ["Too many parameters in function definition (only 65535 allowed)"],
too_many_variables: ["Too many variables declared (only 4194303 allowed)"],
strict_param_dupe: ["Strict mode function may not have duplicate parameter names"],
strict_octal_literal: ["Octal literals are not allowed in strict mode."],
strict_duplicate_property: ["Duplicate data property in object literal not allowed in strict mode"],
accessor_data_property: ["Object literal may not have data and accessor property with the same name"],
accessor_get_set: ["Object literal may not have multiple get/set accessors with the same name"],
strict_delete: ["Delete of an unqualified identifier in strict mode."],
strict_delete_property: ["Cannot delete property '", "%0", "' of ", "%1"],
strict_const: ["Use of const in strict mode."],
strict_function: ["In strict mode code, functions can only be declared at top level or immediately within another function." ],
strict_read_only_property: ["Cannot assign to read only property '", "%0", "' of ", "%1"],
strict_cannot_assign: ["Cannot assign to read only '", "%0", "' in strict mode"],
strict_poison_pill: ["'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them"],
strict_caller: ["Illegal access to a strict mode caller function."],
malformed_arrow_function_parameter_list: ["Malformed arrow function parameter list"],
generator_poison_pill: ["'caller' and 'arguments' properties may not be accessed on generator functions."],
unprotected_let: ["Illegal let declaration in unprotected statement context."],
unprotected_const: ["Illegal const declaration in unprotected statement context."],
cant_prevent_ext_external_array_elements: ["Cannot prevent extension of an object with external array elements"],
redef_external_array_element: ["Cannot redefine a property of an object with external array elements"],
harmony_const_assign: ["Assignment to constant variable."],
symbol_to_string: ["Cannot convert a Symbol value to a string"],
symbol_to_primitive: ["Cannot convert a Symbol wrapper object to a primitive value"],
symbol_to_number: ["Cannot convert a Symbol value to a number"],
invalid_module_path: ["Module does not export '", "%0", "', or export is not itself a module"],
module_type_error: ["Module '", "%0", "' used improperly"],
module_export_undefined: ["Export '", "%0", "' is not defined in module"],
unexpected_super: ["'super' keyword unexpected here"]
};
function FormatString(format, args) {
var result = "";
var arg_num = 0;
for (var i = 0; i < format.length; i++) {
var str = format[i];
if (str.length == 2 && %_StringCharCodeAt(str, 0) == 0x25) {
// Two-char string starts with "%".
var arg_num = (%_StringCharCodeAt(str, 1) - 0x30) >>> 0;
if (arg_num < 4) {
// str is one of %0, %1, %2 or %3.
try {
str = NoSideEffectToString(args[arg_num]);
} catch (e) {
if (%IsJSModule(args[arg_num]))
str = "module";
else if (IS_SPEC_OBJECT(args[arg_num]))
str = "object";
else
str = "#<error>";
}
}
}
result += str;
}
return result;
}
function NoSideEffectToString(obj) {
if (IS_STRING(obj)) return obj;
if (IS_NUMBER(obj)) return %_NumberToString(obj);
if (IS_BOOLEAN(obj)) return obj ? 'true' : 'false';
if (IS_UNDEFINED(obj)) return 'undefined';
if (IS_NULL(obj)) return 'null';
if (IS_FUNCTION(obj)) {
var str = %_CallFunction(obj, FunctionToString);
if (str.length > 128) {
str = %_SubString(str, 0, 111) + "...<omitted>..." +
%_SubString(str, str.length - 2, str.length);
}
return str;
}
if (IS_SYMBOL(obj)) return %_CallFunction(obj, SymbolToString);
if (IS_OBJECT(obj) && %GetDataProperty(obj, "toString") === ObjectToString) {
var constructor = %GetDataProperty(obj, "constructor");
if (typeof constructor == "function") {
var constructorName = constructor.name;
if (IS_STRING(constructorName) && constructorName !== "") {
return "#<" + constructorName + ">";
}
}
}
if (CanBeSafelyTreatedAsAnErrorObject(obj)) {
return %_CallFunction(obj, ErrorToString);
}
return %_CallFunction(obj, ObjectToString);
}
// To determine whether we can safely stringify an object using ErrorToString
// without the risk of side-effects, we need to check whether the object is
// either an instance of a native error type (via '%_ClassOf'), or has $Error
// in its prototype chain and hasn't overwritten 'toString' with something
// strange and unusual.
function CanBeSafelyTreatedAsAnErrorObject(obj) {
switch (%_ClassOf(obj)) {
case 'Error':
case 'EvalError':
case 'RangeError':
case 'ReferenceError':
case 'SyntaxError':
case 'TypeError':
case 'URIError':
return true;
}
var objToString = %GetDataProperty(obj, "toString");
return obj instanceof $Error && objToString === ErrorToString;
}
// When formatting internally created error messages, do not
// invoke overwritten error toString methods but explicitly use
// the error to string method. This is to avoid leaking error
// objects between script tags in a browser setting.
function ToStringCheckErrorObject(obj) {
if (CanBeSafelyTreatedAsAnErrorObject(obj)) {
return %_CallFunction(obj, ErrorToString);
} else {
return ToString(obj);
}
}
function ToDetailString(obj) {
if (obj != null && IS_OBJECT(obj) && obj.toString === ObjectToString) {
var constructor = obj.constructor;
if (typeof constructor == "function") {
var constructorName = constructor.name;
if (IS_STRING(constructorName) && constructorName !== "") {
return "#<" + constructorName + ">";
}
}
}
return ToStringCheckErrorObject(obj);
}
function MakeGenericError(constructor, type, args) {
if (IS_UNDEFINED(args)) args = [];
return new constructor(FormatMessage(type, args));
}
/**
* Set up the Script function and constructor.
*/
%FunctionSetInstanceClassName(Script, 'Script');
%AddNamedProperty(Script.prototype, 'constructor', Script,
DONT_ENUM | DONT_DELETE | READ_ONLY);
%SetCode(Script, function(x) {
// Script objects can only be created by the VM.
throw new $Error("Not supported");
});
// Helper functions; called from the runtime system.
function FormatMessage(type, args) {
var format = kMessages[type];
if (!format) return "<unknown message " + type + ">";
return FormatString(format, args);
}
function GetLineNumber(message) {
var start_position = %MessageGetStartPosition(message);
if (start_position == -1) return kNoLineNumberInfo;
var script = %MessageGetScript(message);
var location = script.locationFromPosition(start_position, true);
if (location == null) return kNoLineNumberInfo;
return location.line + 1;
}
// Returns the source code line containing the given source
// position, or the empty string if the position is invalid.
function GetSourceLine(message) {
var script = %MessageGetScript(message);
var start_position = %MessageGetStartPosition(message);
var location = script.locationFromPosition(start_position, true);
if (location == null) return "";
location.restrict();
return location.sourceText();
}
function MakeTypeError(type, args) {
return MakeGenericError($TypeError, type, args);
}
function MakeRangeError(type, args) {
return MakeGenericError($RangeError, type, args);
}
function MakeSyntaxError(type, args) {
return MakeGenericError($SyntaxError, type, args);
}
function MakeReferenceError(type, args) {
return MakeGenericError($ReferenceError, type, args);
}
function MakeEvalError(type, args) {
return MakeGenericError($EvalError, type, args);
}
function MakeError(type, args) {
return MakeGenericError($Error, type, args);
}
/**
* Find a line number given a specific source position.
* @param {number} position The source position.
* @return {number} 0 if input too small, -1 if input too large,
else the line number.
*/
function ScriptLineFromPosition(position) {
var lower = 0;
var upper = this.lineCount() - 1;
var line_ends = this.line_ends;
// We'll never find invalid positions so bail right away.
if (position > line_ends[upper]) {
return -1;
}
// This means we don't have to safe-guard indexing line_ends[i - 1].
if (position <= line_ends[0]) {
return 0;
}
// Binary search to find line # from position range.
while (upper >= 1) {
var i = (lower + upper) >> 1;
if (position > line_ends[i]) {
lower = i + 1;
} else if (position <= line_ends[i - 1]) {
upper = i - 1;
} else {
return i;
}
}
return -1;
}
/**
* Get information on a specific source position.
* @param {number} position The source position
* @param {boolean} include_resource_offset Set to true to have the resource
* offset added to the location
* @return {SourceLocation}
* If line is negative or not in the source null is returned.
*/
function ScriptLocationFromPosition(position,
include_resource_offset) {
var line = this.lineFromPosition(position);
if (line == -1) return null;
// Determine start, end and column.
var line_ends = this.line_ends;
var start = line == 0 ? 0 : line_ends[line - 1] + 1;
var end = line_ends[line];
if (end > 0 && %_CallFunction(this.source, end - 1, StringCharAt) == '\r') {
end--;
}
var column = position - start;
// Adjust according to the offset within the resource.
if (include_resource_offset) {
line += this.line_offset;
if (line == this.line_offset) {
column += this.column_offset;
}
}
return new SourceLocation(this, position, line, column, start, end);
}
/**
* Get information on a specific source line and column possibly offset by a
* fixed source position. This function is used to find a source position from
* a line and column position. The fixed source position offset is typically
* used to find a source position in a function based on a line and column in
* the source for the function alone. The offset passed will then be the
* start position of the source for the function within the full script source.
* @param {number} opt_line The line within the source. Default value is 0
* @param {number} opt_column The column in within the line. Default value is 0
* @param {number} opt_offset_position The offset from the begining of the
* source from where the line and column calculation starts.
* Default value is 0
* @return {SourceLocation}
* If line is negative or not in the source null is returned.
*/
function ScriptLocationFromLine(opt_line, opt_column, opt_offset_position) {
// Default is the first line in the script. Lines in the script is relative
// to the offset within the resource.
var line = 0;
if (!IS_UNDEFINED(opt_line)) {
line = opt_line - this.line_offset;
}
// Default is first column. If on the first line add the offset within the
// resource.
var column = opt_column || 0;
if (line == 0) {
column -= this.column_offset;
}
var offset_position = opt_offset_position || 0;
if (line < 0 || column < 0 || offset_position < 0) return null;
if (line == 0) {
return this.locationFromPosition(offset_position + column, false);
} else {
// Find the line where the offset position is located.
var offset_line = this.lineFromPosition(offset_position);
if (offset_line == -1 || offset_line + line >= this.lineCount()) {
return null;
}
return this.locationFromPosition(
this.line_ends[offset_line + line - 1] + 1 + column); // line > 0 here.
}
}
/**
* Get a slice of source code from the script. The boundaries for the slice is
* specified in lines.
* @param {number} opt_from_line The first line (zero bound) in the slice.
* Default is 0
* @param {number} opt_to_column The last line (zero bound) in the slice (non
* inclusive). Default is the number of lines in the script
* @return {SourceSlice} The source slice or null of the parameters where
* invalid
*/
function ScriptSourceSlice(opt_from_line, opt_to_line) {
var from_line = IS_UNDEFINED(opt_from_line) ? this.line_offset
: opt_from_line;
var to_line = IS_UNDEFINED(opt_to_line) ? this.line_offset + this.lineCount()
: opt_to_line;
// Adjust according to the offset within the resource.
from_line -= this.line_offset;
to_line -= this.line_offset;
if (from_line < 0) from_line = 0;
if (to_line > this.lineCount()) to_line = this.lineCount();
// Check parameters.
if (from_line >= this.lineCount() ||
to_line < 0 ||
from_line > to_line) {
return null;
}
var line_ends = this.line_ends;
var from_position = from_line == 0 ? 0 : line_ends[from_line - 1] + 1;
var to_position = to_line == 0 ? 0 : line_ends[to_line - 1] + 1;
// Return a source slice with line numbers re-adjusted to the resource.
return new SourceSlice(this,
from_line + this.line_offset,
to_line + this.line_offset,
from_position, to_position);
}
function ScriptSourceLine(opt_line) {
// Default is the first line in the script. Lines in the script are relative
// to the offset within the resource.
var line = 0;
if (!IS_UNDEFINED(opt_line)) {
line = opt_line - this.line_offset;
}
// Check parameter.
if (line < 0 || this.lineCount() <= line) {
return null;
}
// Return the source line.
var line_ends = this.line_ends;
var start = line == 0 ? 0 : line_ends[line - 1] + 1;
var end = line_ends[line];
return %_CallFunction(this.source, start, end, StringSubstring);
}
/**
* Returns the number of source lines.
* @return {number}
* Number of source lines.
*/
function ScriptLineCount() {
// Return number of source lines.
return this.line_ends.length;
}
/**
* If sourceURL comment is available and script starts at zero returns sourceURL
* comment contents. Otherwise, script name is returned. See
* http://fbug.googlecode.com/svn/branches/firebug1.1/docs/ReleaseNotes_1.1.txt
* and Source Map Revision 3 proposal for details on using //# sourceURL and
* deprecated //@ sourceURL comment to identify scripts that don't have name.
*
* @return {?string} script name if present, value for //# sourceURL or
* deprecated //@ sourceURL comment otherwise.
*/
function ScriptNameOrSourceURL() {
if (this.line_offset > 0 || this.column_offset > 0) {
return this.name;
}
if (this.source_url) {
return this.source_url;
}
return this.name;
}
SetUpLockedPrototype(Script,
$Array("source", "name", "source_url", "source_mapping_url", "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;
}
var kLineLengthLimit = 78;
/**
* Restrict source location start and end positions to make the source slice
* no more that a certain number of characters wide.
* @param {number} opt_limit The with limit of the source text with a default
* of 78
* @param {number} opt_before The number of characters to prefer before the
* position with a default value of 10 less that the limit
*/
function SourceLocationRestrict(opt_limit, opt_before) {
// Find the actual limit to use.
var limit;
var before;
if (!IS_UNDEFINED(opt_limit)) {
limit = opt_limit;
} else {
limit = kLineLengthLimit;
}
if (!IS_UNDEFINED(opt_before)) {
before = opt_before;
} else {
// If no before is specified center for small limits and perfer more source
// before the the position that after for longer limits.
if (limit <= 20) {
before = $floor(limit / 2);
} else {
before = limit - 10;
}
}
if (before >= limit) {
before = limit - 1;
}
// If the [start, end[ interval is too big we restrict
// it in one or both ends. We make sure to always produce
// restricted intervals of maximum allowed size.
if (this.end - this.start > limit) {
var start_limit = this.position - before;
var end_limit = this.position + limit - before;
if (this.start < start_limit && end_limit < this.end) {
this.start = start_limit;
this.end = end_limit;
} else if (this.start < start_limit) {
this.start = this.end - limit;
} else {
this.end = this.start + limit;
}
}
}
/**
* Get the source text for a SourceLocation
* @return {String}
* Source text for this location.
*/
function SourceLocationSourceText() {
return %_CallFunction(this.script.source,
this.start,
this.end,
StringSubstring);
}
SetUpLockedPrototype(SourceLocation,
$Array("script", "position", "line", "column", "start", "end"),
$Array(
"restrict", SourceLocationRestrict,
"sourceText", SourceLocationSourceText
)
);
/**
* Class for a source slice. A source slice is a part of a script source with
* the following properties:
* script : script object for the source
* from_line : line number for the first line in the slice
* to_line : source line number for the last line in the slice
* from_position : position of the first character in the slice
* to_position : position of the last character in the slice
* The to_line and to_position are not included in the slice, that is the lines
* in the slice are [from_line, to_line[. Likewise the characters in the slice
* are [from_position, to_position[.
* @param {Script} script The Script object for the source slice
* @param {number} from_line
* @param {number} to_line
* @param {number} from_position
* @param {number} to_position
* @constructor
*/
function SourceSlice(script, from_line, to_line, from_position, to_position) {
this.script = script;
this.from_line = from_line;
this.to_line = to_line;
this.from_position = from_position;
this.to_position = to_position;
}
/**
* Get the source text for a SourceSlice
* @return {String} Source text for this slice. The last line will include
* the line terminating characters (if any)
*/
function SourceSliceSourceText() {
return %_CallFunction(this.script.source,
this.from_position,
this.to_position,
StringSubstring);
}
SetUpLockedPrototype(SourceSlice,
$Array("script", "from_line", "to_line", "from_position", "to_position"),
$Array("sourceText", SourceSliceSourceText)
);
// Returns the offset of the given position within the containing
// line.
function GetPositionInLine(message) {
var script = %MessageGetScript(message);
var start_position = %MessageGetStartPosition(message);
var location = script.locationFromPosition(start_position, false);
if (location == null) return -1;
location.restrict();
return start_position - location.start;
}
function GetStackTraceLine(recv, fun, pos, isGlobal) {
return new CallSite(recv, fun, pos, false).toString();
}
// ----------------------------------------------------------------------------
// Error implementation
var CallSiteReceiverKey = NEW_PRIVATE_OWN("CallSite#receiver");
var CallSiteFunctionKey = NEW_PRIVATE_OWN("CallSite#function");
var CallSitePositionKey = NEW_PRIVATE_OWN("CallSite#position");
var CallSiteStrictModeKey = NEW_PRIVATE_OWN("CallSite#strict_mode");
function CallSite(receiver, fun, pos, strict_mode) {
SET_PRIVATE(this, CallSiteReceiverKey, receiver);
SET_PRIVATE(this, CallSiteFunctionKey, fun);
SET_PRIVATE(this, CallSitePositionKey, pos);
SET_PRIVATE(this, CallSiteStrictModeKey, strict_mode);
}
function CallSiteGetThis() {
return GET_PRIVATE(this, CallSiteStrictModeKey)
? UNDEFINED : GET_PRIVATE(this, CallSiteReceiverKey);
}
function CallSiteGetTypeName() {
return GetTypeName(GET_PRIVATE(this, CallSiteReceiverKey), false);
}
function CallSiteIsToplevel() {
if (GET_PRIVATE(this, CallSiteReceiverKey) == null) {
return true;
}
return IS_GLOBAL(GET_PRIVATE(this, CallSiteReceiverKey));
}
function CallSiteIsEval() {
var script = %FunctionGetScript(GET_PRIVATE(this, CallSiteFunctionKey));
return script && script.compilation_type == COMPILATION_TYPE_EVAL;
}
function CallSiteGetEvalOrigin() {
var script = %FunctionGetScript(GET_PRIVATE(this, CallSiteFunctionKey));
return FormatEvalOrigin(script);
}
function CallSiteGetScriptNameOrSourceURL() {
var script = %FunctionGetScript(GET_PRIVATE(this, CallSiteFunctionKey));
return script ? script.nameOrSourceURL() : null;
}
function CallSiteGetFunction() {
return GET_PRIVATE(this, CallSiteStrictModeKey)
? UNDEFINED : GET_PRIVATE(this, CallSiteFunctionKey);
}
function CallSiteGetFunctionName() {
// See if the function knows its own name
var name = GET_PRIVATE(this, CallSiteFunctionKey).name;
if (name) {
return name;
}
name = %FunctionGetInferredName(GET_PRIVATE(this, CallSiteFunctionKey));
if (name) {
return name;
}
// Maybe this is an evaluation?
var script = %FunctionGetScript(GET_PRIVATE(this, CallSiteFunctionKey));
if (script && script.compilation_type == COMPILATION_TYPE_EVAL) {
return "eval";
}
return null;
}
function CallSiteGetMethodName() {
// See if we can find a unique property on the receiver that holds
// this function.
var receiver = GET_PRIVATE(this, CallSiteReceiverKey);
var fun = GET_PRIVATE(this, CallSiteFunctionKey);
var ownName = fun.name;
if (ownName && receiver &&
(%_CallFunction(receiver, ownName, ObjectLookupGetter) === fun ||
%_CallFunction(receiver, ownName, ObjectLookupSetter) === fun ||
(IS_OBJECT(receiver) && %GetDataProperty(receiver, ownName) === fun))) {
// To handle DontEnum properties we guess that the method has
// the same name as the function.
return ownName;
}
var name = null;
for (var prop in receiver) {
if (%_CallFunction(receiver, prop, ObjectLookupGetter) === fun ||
%_CallFunction(receiver, prop, ObjectLookupSetter) === fun ||
(IS_OBJECT(receiver) && %GetDataProperty(receiver, prop) === fun)) {
// If we find more than one match bail out to avoid confusion.
if (name) {
return null;
}
name = prop;
}
}
if (name) {
return name;
}
return null;
}
function CallSiteGetFileName() {
var script = %FunctionGetScript(GET_PRIVATE(this, CallSiteFunctionKey));
return script ? script.name : null;
}
function CallSiteGetLineNumber() {
if (GET_PRIVATE(this, CallSitePositionKey) == -1) {
return null;
}
var script = %FunctionGetScript(GET_PRIVATE(this, CallSiteFunctionKey));
var location = null;
if (script) {
location = script.locationFromPosition(
GET_PRIVATE(this, CallSitePositionKey), true);
}
return location ? location.line + 1 : null;
}
function CallSiteGetColumnNumber() {
if (GET_PRIVATE(this, CallSitePositionKey) == -1) {
return null;
}
var script = %FunctionGetScript(GET_PRIVATE(this, CallSiteFunctionKey));
var location = null;
if (script) {
location = script.locationFromPosition(
GET_PRIVATE(this, CallSitePositionKey), true);
}
return location ? location.column + 1: null;
}
function CallSiteIsNative() {
var script = %FunctionGetScript(GET_PRIVATE(this, CallSiteFunctionKey));
return script ? (script.type == TYPE_NATIVE) : false;
}
function CallSiteGetPosition() {
return GET_PRIVATE(this, CallSitePositionKey);
}
function CallSiteIsConstructor() {
var receiver = GET_PRIVATE(this, CallSiteReceiverKey);
var constructor = (receiver != null && IS_OBJECT(receiver))
? %GetDataProperty(receiver, "constructor") : null;
if (!constructor) return false;
return GET_PRIVATE(this, CallSiteFunctionKey) === constructor;
}
function CallSiteToString() {
var fileName;
var fileLocation = "";
if (this.isNative()) {
fileLocation = "native";
} else {
fileName = this.getScriptNameOrSourceURL();
if (!fileName && this.isEval()) {
fileLocation = this.getEvalOrigin();
fileLocation += ", "; // Expecting source position to follow.
}
if (fileName) {
fileLocation += fileName;
} else {
// Source code does not originate from a file and is not native, but we
// can still get the source position inside the source string, e.g. in
// an eval string.
fileLocation += "<anonymous>";
}
var lineNumber = this.getLineNumber();
if (lineNumber != null) {
fileLocation += ":" + lineNumber;
var columnNumber = this.getColumnNumber();
if (columnNumber) {
fileLocation += ":" + columnNumber;
}
}
}
var line = "";
var functionName = this.getFunctionName();
var addSuffix = true;
var isConstructor = this.isConstructor();
var isMethodCall = !(this.isToplevel() || isConstructor);
if (isMethodCall) {
var typeName = GetTypeName(GET_PRIVATE(this, CallSiteReceiverKey), true);
var methodName = this.getMethodName();
if (functionName) {
if (typeName &&
%_CallFunction(functionName, typeName, StringIndexOfJS) != 0) {
line += typeName + ".";
}
line += functionName;
if (methodName &&
(%_CallFunction(functionName, "." + methodName, StringIndexOfJS) !=
functionName.length - methodName.length - 1)) {
line += " [as " + methodName + "]";
}
} else {
line += typeName + "." + (methodName || "<anonymous>");
}
} else if (isConstructor) {
line += "new " + (functionName || "<anonymous>");
} else if (functionName) {
line += functionName;
} else {
line += fileLocation;
addSuffix = false;
}
if (addSuffix) {
line += " (" + fileLocation + ")";
}
return line;
}
SetUpLockedPrototype(CallSite, $Array("receiver", "fun", "pos"), $Array(
"getThis", CallSiteGetThis,
"getTypeName", CallSiteGetTypeName,
"isToplevel", CallSiteIsToplevel,
"isEval", CallSiteIsEval,
"getEvalOrigin", CallSiteGetEvalOrigin,
"getScriptNameOrSourceURL", CallSiteGetScriptNameOrSourceURL,
"getFunction", CallSiteGetFunction,
"getFunctionName", CallSiteGetFunctionName,
"getMethodName", CallSiteGetMethodName,
"getFileName", CallSiteGetFileName,
"getLineNumber", CallSiteGetLineNumber,
"getColumnNumber", CallSiteGetColumnNumber,
"isNative", CallSiteIsNative,
"getPosition", CallSiteGetPosition,
"isConstructor", CallSiteIsConstructor,
"toString", CallSiteToString
));
function FormatEvalOrigin(script) {
var sourceURL = script.nameOrSourceURL();
if (sourceURL) {
return sourceURL;
}
var eval_origin = "eval at ";
if (script.eval_from_function_name) {
eval_origin += script.eval_from_function_name;
} else {
eval_origin += "<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 FormatErrorString(error) {
try {
return %_CallFunction(error, ErrorToString);
} catch (e) {
try {
return "<error: " + e + ">";
} catch (ee) {
return "<error>";
}
}
}
function GetStackFrames(raw_stack) {
var frames = new InternalArray();
var sloppy_frames = raw_stack[0];
for (var i = 1; i < raw_stack.length; i += 4) {
var recv = raw_stack[i];
var fun = raw_stack[i + 1];
var code = raw_stack[i + 2];
var pc = raw_stack[i + 3];
var pos = %FunctionGetPositionForOffset(code, pc);
sloppy_frames--;
frames.push(new CallSite(recv, fun, pos, (sloppy_frames < 0)));
}
return frames;
}
// Flag to prevent recursive call of Error.prepareStackTrace.
var formatting_custom_stack_trace = false;
function FormatStackTrace(obj, raw_stack) {
var frames = GetStackFrames(raw_stack);
if (IS_FUNCTION($Error.prepareStackTrace) && !formatting_custom_stack_trace) {
var array = [];
%MoveArrayContents(frames, array);
formatting_custom_stack_trace = true;
var stack_trace = UNDEFINED;
try {
stack_trace = $Error.prepareStackTrace(obj, array);
} catch (e) {
throw e; // The custom formatting function threw. Rethrow.
} finally {
formatting_custom_stack_trace = false;
}
return stack_trace;
}
var lines = new InternalArray();
lines.push(FormatErrorString(obj));
for (var i = 0; i < frames.length; i++) {
var frame = frames[i];
var line;
try {
line = frame.toString();
} catch (e) {
try {
line = "<error: " + e + ">";
} catch (ee) {
// Any code that reaches this point is seriously nasty!
line = "<error>";
}
}
lines.push(" at " + line);
}
return %_CallFunction(lines, "\n", ArrayJoin);
}
function GetTypeName(receiver, requireConstructor) {
var constructor = receiver.constructor;
if (!constructor) {
return requireConstructor ? null :
%_CallFunction(receiver, ObjectToString);
}
var constructorName = constructor.name;
if (!constructorName) {
return requireConstructor ? null :
%_CallFunction(receiver, ObjectToString);
}
return constructorName;
}
var stack_trace_symbol; // Set during bootstrapping.
var formatted_stack_trace_symbol = NEW_PRIVATE_OWN("formatted stack trace");
// Format the stack trace if not yet done, and return it.
// Cache the formatted stack trace on the holder.
var StackTraceGetter = function() {
var formatted_stack_trace = UNDEFINED;
var holder = this;
while (holder) {
var formatted_stack_trace =
GET_PRIVATE(holder, formatted_stack_trace_symbol);
if (IS_UNDEFINED(formatted_stack_trace)) {
// No formatted stack trace available.
var stack_trace = GET_PRIVATE(holder, stack_trace_symbol);
if (IS_UNDEFINED(stack_trace)) {
// Neither formatted nor structured stack trace available.
// Look further up the prototype chain.
holder = %GetPrototype(holder);
continue;
}
formatted_stack_trace = FormatStackTrace(holder, stack_trace);
SET_PRIVATE(holder, stack_trace_symbol, UNDEFINED);
SET_PRIVATE(holder, formatted_stack_trace_symbol, formatted_stack_trace);
}
return formatted_stack_trace;
}
return UNDEFINED;
};
// If the receiver equals the holder, set the formatted stack trace that the
// getter returns.
var StackTraceSetter = function(v) {
if (HAS_PRIVATE(this, stack_trace_symbol)) {
SET_PRIVATE(this, stack_trace_symbol, UNDEFINED);
SET_PRIVATE(this, formatted_stack_trace_symbol, v);
}
};
// Use a dummy function since we do not actually want to capture a stack trace
// when constructing the initial Error prototytpes.
var captureStackTrace = function captureStackTrace(obj, cons_opt) {
// Define accessors first, as this may fail and throw.
ObjectDefineProperty(obj, 'stack', { get: StackTraceGetter,
set: StackTraceSetter,
configurable: true });
%CollectStackTrace(obj, cons_opt ? cons_opt : captureStackTrace);
}
function SetUpError() {
// Define special error type constructors.
var DefineError = function(f) {
// Store the error function in both the global object
// and the runtime object. The function is fetched
// from the runtime object when throwing errors from
// within the runtime system to avoid strange side
// effects when overwriting the error functions from
// user code.
var name = f.name;
%AddNamedProperty(global, name, f, DONT_ENUM);
%AddNamedProperty(builtins, '$' + name, f,
DONT_ENUM | DONT_DELETE | READ_ONLY);
// Configure the error function.
if (name == 'Error') {
// The prototype of the Error object must itself be an error.
// However, it can't be an instance of the Error object because
// it hasn't been properly configured yet. Instead we create a
// special not-a-true-error-but-close-enough object.
var ErrorPrototype = function() {};
%FunctionSetPrototype(ErrorPrototype, $Object.prototype);
%FunctionSetInstanceClassName(ErrorPrototype, 'Error');
%FunctionSetPrototype(f, new ErrorPrototype());
} else {
%FunctionSetPrototype(f, new $Error());
}
%FunctionSetInstanceClassName(f, 'Error');
%AddNamedProperty(f.prototype, 'constructor', f, DONT_ENUM);
%AddNamedProperty(f.prototype, "name", name, DONT_ENUM);
%SetCode(f, function(m) {
if (%_IsConstructCall()) {
// Define all the expected properties directly on the error
// object. This avoids going through getters and setters defined
// on prototype objects.
%AddNamedProperty(this, 'stack', UNDEFINED, DONT_ENUM);
if (!IS_UNDEFINED(m)) {
%AddNamedProperty(this, 'message', ToString(m), DONT_ENUM);
}
try { captureStackTrace(this, f); } catch (e) { }
} else {
return new f(m);
}
});
%SetNativeFlag(f);
};
DefineError(function Error() { });
DefineError(function TypeError() { });
DefineError(function RangeError() { });
DefineError(function SyntaxError() { });
DefineError(function ReferenceError() { });
DefineError(function EvalError() { });
DefineError(function URIError() { });
}
SetUpError();
$Error.captureStackTrace = captureStackTrace;
%AddNamedProperty($Error.prototype, 'message', '', DONT_ENUM);
// Global list of error objects visited during ErrorToString. This is
// used to detect cycles in error toString formatting.
var visited_errors = new InternalArray();
var cyclic_error_marker = new $Object();
function GetPropertyWithoutInvokingMonkeyGetters(error, name) {
var current = error;
// Climb the prototype chain until we find the holder.
while (current && !%HasOwnProperty(current, name)) {
current = %GetPrototype(current);
}
if (IS_NULL(current)) return UNDEFINED;
if (!IS_OBJECT(current)) return error[name];
// If the property is an accessor on one of the predefined errors that can be
// generated statically by the compiler, don't touch it. This is to address
// http://code.google.com/p/chromium/issues/detail?id=69187
var desc = %GetOwnProperty(current, name);
if (desc && desc[IS_ACCESSOR_INDEX]) {
var isName = name === "name";
if (current === $ReferenceError.prototype)
return isName ? "ReferenceError" : UNDEFINED;
if (current === $SyntaxError.prototype)
return isName ? "SyntaxError" : UNDEFINED;
if (current === $TypeError.prototype)
return isName ? "TypeError" : UNDEFINED;
}
// Otherwise, read normally.
return error[name];
}
function ErrorToStringDetectCycle(error) {
if (!%PushIfAbsent(visited_errors, error)) throw cyclic_error_marker;
try {
var name = GetPropertyWithoutInvokingMonkeyGetters(error, "name");
name = IS_UNDEFINED(name) ? "Error" : TO_STRING_INLINE(name);
var message = GetPropertyWithoutInvokingMonkeyGetters(error, "message");
message = IS_UNDEFINED(message) ? "" : TO_STRING_INLINE(message);
if (name === "") return message;
if (message === "") return name;
return name + ": " + message;
} finally {
visited_errors.length = visited_errors.length - 1;
}
}
function ErrorToString() {
if (!IS_SPEC_OBJECT(this)) {
throw MakeTypeError("called_on_non_object", ["Error.prototype.toString"]);
}
try {
return ErrorToStringDetectCycle(this);
} catch(e) {
// If this error message was encountered already return the empty
// string for it instead of recursively formatting it.
if (e === cyclic_error_marker) {
return '';
}
throw e;
}
}
InstallFunctions($Error.prototype, DONT_ENUM, ['toString', ErrorToString]);
// Boilerplate for exceptions for stack overflows. Used from
// Isolate::StackOverflow().
function SetUpStackOverflowBoilerplate() {
var boilerplate = MakeRangeError('stack_overflow', []);
%DefineAccessorPropertyUnchecked(
boilerplate, 'stack', StackTraceGetter, StackTraceSetter, DONT_ENUM);
return boilerplate;
}
var kStackOverflowBoilerplate = SetUpStackOverflowBoilerplate();