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v8/src/messages.js

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// Copyright 2012 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// -------------------------------------------------------------------
var kMessages = {
// Error
cyclic_proto: ["Cyclic __proto__ value"],
code_gen_from_strings: ["%0"],
generator_running: ["Generator is already running"],
generator_finished: ["Generator has already finished"],
// TypeError
unexpected_token: ["Unexpected token ", "%0"],
unexpected_token_number: ["Unexpected number"],
unexpected_token_string: ["Unexpected string"],
unexpected_token_identifier: ["Unexpected identifier"],
unexpected_reserved: ["Unexpected reserved word"],
unexpected_strict_reserved: ["Unexpected strict mode reserved word"],
unexpected_eos: ["Unexpected end of input"],
malformed_regexp: ["Invalid regular expression: /", "%0", "/: ", "%1"],
unterminated_regexp: ["Invalid regular expression: missing /"],
regexp_flags: ["Cannot supply flags when constructing one RegExp from another"],
incompatible_method_receiver: ["Method ", "%0", " called on incompatible receiver ", "%1"],
invalid_lhs_in_assignment: ["Invalid left-hand side in assignment"],
invalid_lhs_in_for_in: ["Invalid left-hand side in for-in"],
invalid_lhs_in_postfix_op: ["Invalid left-hand side expression in postfix operation"],
invalid_lhs_in_prefix_op: ["Invalid left-hand side expression in prefix operation"],
multiple_defaults_in_switch: ["More than one default clause in switch statement"],
newline_after_throw: ["Illegal newline after throw"],
redeclaration: ["%0", " '", "%1", "' has already been declared"],
no_catch_or_finally: ["Missing catch or finally after try"],
unknown_label: ["Undefined label '", "%0", "'"],
uncaught_exception: ["Uncaught ", "%0"],
stack_trace: ["Stack Trace:\n", "%0"],
called_non_callable: ["%0", " is not a function"],
undefined_method: ["Object ", "%1", " has no method '", "%0", "'"],
property_not_function: ["Property '", "%0", "' of object ", "%1", " is not a function"],
cannot_convert_to_primitive: ["Cannot convert object to primitive value"],
not_constructor: ["%0", " is not a constructor"],
not_defined: ["%0", " is not defined"],
non_object_property_load: ["Cannot read property '", "%0", "' of ", "%1"],
non_object_property_store: ["Cannot set property '", "%0", "' of ", "%1"],
non_object_property_call: ["Cannot call method '", "%0", "' of ", "%1"],
with_expression: ["%0", " has no properties"],
illegal_invocation: ["Illegal invocation"],
no_setter_in_callback: ["Cannot set property ", "%0", " of ", "%1", " which has only a getter"],
apply_non_function: ["Function.prototype.apply was called on ", "%0", ", which is a ", "%1", " and not a function"],
apply_wrong_args: ["Function.prototype.apply: Arguments list has wrong type"],
invalid_in_operator_use: ["Cannot use 'in' operator to search for '", "%0", "' in ", "%1"],
instanceof_function_expected: ["Expecting a function in instanceof check, but got ", "%0"],
instanceof_nonobject_proto: ["Function has non-object prototype '", "%0", "' in instanceof check"],
null_to_object: ["Cannot convert null to object"],
reduce_no_initial: ["Reduce of empty array with no initial value"],
getter_must_be_callable: ["Getter must be a function: ", "%0"],
setter_must_be_callable: ["Setter must be a function: ", "%0"],
value_and_accessor: ["Invalid property. A property cannot both have accessors and be writable or have a value, ", "%0"],
proto_object_or_null: ["Object prototype may only be an Object or null"],
property_desc_object: ["Property description must be an object: ", "%0"],
redefine_disallowed: ["Cannot redefine property: ", "%0"],
define_disallowed: ["Cannot define property:", "%0", ", object is not extensible."],
non_extensible_proto: ["%0", " is not extensible"],
handler_non_object: ["Proxy.", "%0", " called with non-object as handler"],
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"],
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"],
proto_poison_pill: ["Generic use of __proto__ accessor not allowed"],
parameterless_typed_array_constr:
["%0"," constructor should have at least one argument."],
not_typed_array: ["this is not a typed array."],
invalid_argument: ["invalid_argument"],
// RangeError
invalid_array_length: ["Invalid array length"],
invalid_array_buffer_length: ["Invalid array buffer length"],
invalid_typed_array_offset: ["Start offset is too large"],
invalid_typed_array_length: ["Length is too large"],
invalid_typed_array_alignment: ["%0", "of", "%1", "should be a multiple of", "%3"],
typed_array_set_source_too_large:
["Source is too large"],
stack_overflow: ["Maximum call stack size exceeded"],
invalid_time_value: ["Invalid time value"],
// SyntaxError
paren_in_arg_string: ["Function arg string contains parenthesis"],
not_isvar: ["builtin %IS_VAR: not a variable"],
single_function_literal: ["Single function literal required"],
invalid_regexp_flags: ["Invalid flags supplied to RegExp constructor '", "%0", "'"],
invalid_regexp: ["Invalid RegExp pattern /", "%0", "/"],
illegal_break: ["Illegal break statement"],
illegal_continue: ["Illegal continue statement"],
illegal_return: ["Illegal return statement"],
illegal_let: ["Illegal let declaration outside extended mode"],
error_loading_debugger: ["Error loading debugger"],
no_input_to_regexp: ["No input to ", "%0"],
invalid_json: ["String '", "%0", "' is not valid JSON"],
circular_structure: ["Converting circular structure to JSON"],
called_on_non_object: ["%0", " called on non-object"],
called_on_null_or_undefined: ["%0", " called on null or undefined"],
array_indexof_not_defined: ["Array.getIndexOf: Argument undefined"],
object_not_extensible: ["Can't add property ", "%0", ", object is not extensible"],
illegal_access: ["Illegal access"],
invalid_preparser_data: ["Invalid preparser data for function ", "%0"],
strict_mode_with: ["Strict mode code may not include a with statement"],
strict_catch_variable: ["Catch variable may not be eval or arguments in strict mode"],
too_many_arguments: ["Too many arguments in function call (only 32766 allowed)"],
too_many_parameters: ["Too many parameters in function definition (only 32766 allowed)"],
too_many_variables: ["Too many variables declared (only 131071 allowed)"],
strict_param_name: ["Parameter name eval or arguments is not allowed in strict mode"],
strict_param_dupe: ["Strict mode function may not have duplicate parameter names"],
strict_var_name: ["Variable name may not be eval or arguments in strict mode"],
strict_function_name: ["Function name may not be eval or arguments in strict mode"],
strict_octal_literal: ["Octal literals are not allowed in strict mode."],
strict_duplicate_property: ["Duplicate data property in object literal not allowed in strict mode"],
accessor_data_property: ["Object literal may not have data and accessor property with the same name"],
accessor_get_set: ["Object literal may not have multiple get/set accessors with the same name"],
strict_lhs_assignment: ["Assignment to eval or arguments is not allowed in strict mode"],
strict_lhs_postfix: ["Postfix increment/decrement may not have eval or arguments operand in strict mode"],
strict_lhs_prefix: ["Prefix increment/decrement may not have eval or arguments operand in strict mode"],
strict_reserved_word: ["Use of future reserved word in strict mode"],
strict_delete: ["Delete of an unqualified identifier in strict mode."],
strict_delete_property: ["Cannot delete property '", "%0", "' of ", "%1"],
strict_const: ["Use of const in strict mode."],
strict_function: ["In strict mode code, functions can only be declared at top level or immediately within another function." ],
strict_read_only_property: ["Cannot assign to read only property '", "%0", "' of ", "%1"],
strict_cannot_assign: ["Cannot assign to read only '", "%0", "' in strict mode"],
strict_poison_pill: ["'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them"],
strict_caller: ["Illegal access to a strict mode caller function."],
unprotected_let: ["Illegal let declaration in unprotected statement context."],
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: ["Conversion from symbol to string"],
invalid_module_path: ["Module does not export '", "%0", "', or export is not itself a module"],
module_type_error: ["Module '", "%0", "' used improperly"],
module_export_undefined: ["Export '", "%0", "' is not defined in module"]
};
function FormatString(format, args) {
var result = "";
var arg_num = 0;
for (var i = 0; i < format.length; i++) {
var str = format[i];
if (str.length == 2 && %_StringCharCodeAt(str, 0) == 0x25) {
// Two-char string starts with "%".
var arg_num = (%_StringCharCodeAt(str, 1) - 0x30) >>> 0;
if (arg_num < 4) {
// str is one of %0, %1, %2 or %3.
try {
str = NoSideEffectToString(args[arg_num]);
} 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 x ? 'true' : 'false';
if (IS_UNDEFINED(obj)) return 'undefined';
if (IS_NULL(obj)) return 'null';
if (IS_FUNCTION(obj)) return %_CallFunction(obj, FunctionToString);
if (IS_OBJECT(obj) && %GetDataProperty(obj, "toString") === ObjectToString) {
var constructor = %GetDataProperty(obj, "constructor");
if (typeof constructor == "function") {
var constructorName = constructor.name;
if (IS_STRING(constructorName) && constructorName !== "") {
return "#<" + constructorName + ">";
}
}
}
if (IsNativeErrorObject(obj)) return %_CallFunction(obj, ErrorToString);
return %_CallFunction(obj, ObjectToString);
}
// To check if something is a native error we need to check the
// concrete native error types. It is not sufficient to use instanceof
// since it possible to create an object that has Error.prototype on
// its prototype chain. This is the case for DOMException for example.
function IsNativeErrorObject(obj) {
switch (%_ClassOf(obj)) {
case 'Error':
case 'EvalError':
case 'RangeError':
case 'ReferenceError':
case 'SyntaxError':
case 'TypeError':
case 'URIError':
return true;
}
return false;
}
// When formatting internally created error messages, do not
// invoke overwritten error toString methods but explicitly use
// the error to string method. This is to avoid leaking error
// objects between script tags in a browser setting.
function ToStringCheckErrorObject(obj) {
if (IsNativeErrorObject(obj)) {
return %_CallFunction(obj, ErrorToString);
} else {
return ToString(obj);
}
}
function ToDetailString(obj) {
if (obj != null && IS_OBJECT(obj) && obj.toString === ObjectToString) {
var constructor = obj.constructor;
if (typeof constructor == "function") {
var constructorName = constructor.name;
if (IS_STRING(constructorName) && constructorName !== "") {
return "#<" + constructorName + ">";
}
}
}
return ToStringCheckErrorObject(obj);
}
function MakeGenericError(constructor, type, args) {
if (IS_UNDEFINED(args)) args = [];
return new constructor(FormatMessage(type, args));
}
/**
* Set up the Script function and constructor.
*/
%FunctionSetInstanceClassName(Script, 'Script');
%SetProperty(Script.prototype, 'constructor', Script,
DONT_ENUM | DONT_DELETE | READ_ONLY);
%SetCode(Script, function(x) {
// Script objects can only be created by the VM.
throw new $Error("Not supported");
});
// Helper functions; called from the runtime system.
function FormatMessage(type, args) {
var format = kMessages[type];
if (!format) return "<unknown message " + type + ">";
return FormatString(format, args);
}
function GetLineNumber(message) {
var start_position = %MessageGetStartPosition(message);
if (start_position == -1) return kNoLineNumberInfo;
var script = %MessageGetScript(message);
var location = script.locationFromPosition(start_position, true);
if (location == null) return kNoLineNumberInfo;
return location.line + 1;
}
// Returns the source code line containing the given source
// position, or the empty string if the position is invalid.
function GetSourceLine(message) {
var script = %MessageGetScript(message);
var start_position = %MessageGetStartPosition(message);
var location = script.locationFromPosition(start_position, true);
if (location == null) return "";
location.restrict();
return location.sourceText();
}
function MakeTypeError(type, args) {
return MakeGenericError($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;
}
// The result is cached as on long scripts it takes noticable time to search
// for the sourceURL.
if (this.hasCachedNameOrSourceURL) {
return this.cachedNameOrSourceURL;
}
this.hasCachedNameOrSourceURL = true;
// TODO(608): the spaces in a regexp below had to be escaped as \040
// because this file is being processed by js2c whose handling of spaces
// in regexps is broken. Also, ['"] are excluded from allowed URLs to
// avoid matches against sources that invoke evals with sourceURL.
// A better solution would be to detect these special comments in
// the scanner/parser.
var source = ToString(this.source);
var sourceUrlPos = %StringIndexOf(source, "sourceURL=", 0);
this.cachedNameOrSourceURL = this.name;
if (sourceUrlPos > 4) {
var sourceUrlPattern =
/\/\/[#@][\040\t]sourceURL=[\040\t]*([^\s\'\"]*)[\040\t]*$/gm;
// Don't reuse lastMatchInfo here, so we create a new array with room
// for four captures (array with length one longer than the index
// of the fourth capture, where the numbering is zero-based).
var matchInfo = new InternalArray(CAPTURE(3) + 1);
var match =
%_RegExpExec(sourceUrlPattern, source, sourceUrlPos - 4, matchInfo);
if (match) {
this.cachedNameOrSourceURL =
%_SubString(source, matchInfo[CAPTURE(2)], matchInfo[CAPTURE(3)]);
}
}
return this.cachedNameOrSourceURL;
}
SetUpLockedPrototype(Script,
$Array("source", "name", "line_ends", "line_offset", "column_offset",
"cachedNameOrSourceURL", "hasCachedNameOrSourceURL" ),
$Array(
"lineFromPosition", ScriptLineFromPosition,
"locationFromPosition", ScriptLocationFromPosition,
"locationFromLine", ScriptLocationFromLine,
"sourceSlice", ScriptSourceSlice,
"sourceLine", ScriptSourceLine,
"lineCount", ScriptLineCount,
"nameOrSourceURL", ScriptNameOrSourceURL
)
);
/**
* Class for source location. A source location is a position within some
* source with the following properties:
* script : script object for the source
* line : source line number
* column : source column within the line
* position : position within the source
* start : position of start of source context (inclusive)
* end : position of end of source context (not inclusive)
* Source text for the source context is the character interval
* [start, end[. In most cases end will point to a newline character.
* It might point just past the final position of the source if the last
* source line does not end with a newline character.
* @param {Script} script The Script object for which this is a location
* @param {number} position Source position for the location
* @param {number} line The line number for the location
* @param {number} column The column within the line for the location
* @param {number} start Source position for start of source context
* @param {number} end Source position for end of source context
* @constructor
*/
function SourceLocation(script, position, line, column, start, end) {
this.script = script;
this.position = position;
this.line = line;
this.column = column;
this.start = start;
this.end = end;
}
var kLineLengthLimit = 78;
/**
* Restrict source location start and end positions to make the source slice
* no more that a certain number of characters wide.
* @param {number} opt_limit The with limit of the source text with a default
* of 78
* @param {number} opt_before The number of characters to prefer before the
* position with a default value of 10 less that the limit
*/
function SourceLocationRestrict(opt_limit, opt_before) {
// Find the actual limit to use.
var limit;
var before;
if (!IS_UNDEFINED(opt_limit)) {
limit = opt_limit;
} else {
limit = kLineLengthLimit;
}
if (!IS_UNDEFINED(opt_before)) {
before = opt_before;
} else {
// If no before is specified center for small limits and perfer more source
// before the the position that after for longer limits.
if (limit <= 20) {
before = $floor(limit / 2);
} else {
before = limit - 10;
}
}
if (before >= limit) {
before = limit - 1;
}
// If the [start, end[ interval is too big we restrict
// it in one or both ends. We make sure to always produce
// restricted intervals of maximum allowed size.
if (this.end - this.start > limit) {
var start_limit = this.position - before;
var end_limit = this.position + limit - before;
if (this.start < start_limit && end_limit < this.end) {
this.start = start_limit;
this.end = end_limit;
} else if (this.start < start_limit) {
this.start = this.end - limit;
} else {
this.end = this.start + limit;
}
}
}
/**
* Get the source text for a SourceLocation
* @return {String}
* Source text for this location.
*/
function SourceLocationSourceText() {
return %_CallFunction(this.script.source,
this.start,
this.end,
StringSubstring);
}
SetUpLockedPrototype(SourceLocation,
$Array("script", "position", "line", "column", "start", "end"),
$Array(
"restrict", SourceLocationRestrict,
"sourceText", SourceLocationSourceText
)
);
/**
* Class for a source slice. A source slice is a part of a script source with
* the following properties:
* script : script object for the source
* from_line : line number for the first line in the slice
* to_line : source line number for the last line in the slice
* from_position : position of the first character in the slice
* to_position : position of the last character in the slice
* The to_line and to_position are not included in the slice, that is the lines
* in the slice are [from_line, to_line[. Likewise the characters in the slice
* are [from_position, to_position[.
* @param {Script} script The Script object for the source slice
* @param {number} from_line
* @param {number} to_line
* @param {number} from_position
* @param {number} to_position
* @constructor
*/
function SourceSlice(script, from_line, to_line, from_position, to_position) {
this.script = script;
this.from_line = from_line;
this.to_line = to_line;
this.from_position = from_position;
this.to_position = to_position;
}
/**
* Get the source text for a SourceSlice
* @return {String} Source text for this slice. The last line will include
* the line terminating characters (if any)
*/
function SourceSliceSourceText() {
return %_CallFunction(this.script.source,
this.from_position,
this.to_position,
StringSubstring);
}
SetUpLockedPrototype(SourceSlice,
$Array("script", "from_line", "to_line", "from_position", "to_position"),
$Array("sourceText", SourceSliceSourceText)
);
// Returns the offset of the given position within the containing
// line.
function GetPositionInLine(message) {
var script = %MessageGetScript(message);
var start_position = %MessageGetStartPosition(message);
var location = script.locationFromPosition(start_position, false);
if (location == null) return -1;
location.restrict();
return start_position - location.start;
}
function GetStackTraceLine(recv, fun, pos, isGlobal) {
return new CallSite(recv, fun, pos, false).toString();
}
// ----------------------------------------------------------------------------
// Error implementation
var CallSiteReceiverKey = %CreateSymbol("receiver");
var CallSiteFunctionKey = %CreateSymbol("function");
var CallSitePositionKey = %CreateSymbol("position");
var CallSiteStrictModeKey = %CreateSymbol("strict mode");
function CallSite(receiver, fun, pos, strict_mode) {
this[CallSiteReceiverKey] = receiver;
this[CallSiteFunctionKey] = fun;
this[CallSitePositionKey] = pos;
this[CallSiteStrictModeKey] = strict_mode;
}
function CallSiteGetThis() {
return this[CallSiteStrictModeKey] ? void 0 : this[CallSiteReceiverKey];
}
function CallSiteGetTypeName() {
return GetTypeName(this[CallSiteReceiverKey], false);
}
function CallSiteIsToplevel() {
if (this[CallSiteReceiverKey] == null) {
return true;
}
return IS_GLOBAL(this[CallSiteReceiverKey]);
}
function CallSiteIsEval() {
var script = %FunctionGetScript(this[CallSiteFunctionKey]);
return script && script.compilation_type == COMPILATION_TYPE_EVAL;
}
function CallSiteGetEvalOrigin() {
var script = %FunctionGetScript(this[CallSiteFunctionKey]);
return FormatEvalOrigin(script);
}
function CallSiteGetScriptNameOrSourceURL() {
var script = %FunctionGetScript(this[CallSiteFunctionKey]);
return script ? script.nameOrSourceURL() : null;
}
function CallSiteGetFunction() {
return this[CallSiteStrictModeKey] ? void 0 : this[CallSiteFunctionKey];
}
function CallSiteGetFunctionName() {
// See if the function knows its own name
var name = this[CallSiteFunctionKey].name;
if (name) {
return name;
}
name = %FunctionGetInferredName(this[CallSiteFunctionKey]);
if (name) {
return name;
}
// Maybe this is an evaluation?
var script = %FunctionGetScript(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 = this[CallSiteReceiverKey];
var fun = 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(this[CallSiteFunctionKey]);
return script ? script.name : null;
}
function CallSiteGetLineNumber() {
if (this[CallSitePositionKey] == -1) {
return null;
}
var script = %FunctionGetScript(this[CallSiteFunctionKey]);
var location = null;
if (script) {
location = script.locationFromPosition(this[CallSitePositionKey], true);
}
return location ? location.line + 1 : null;
}
function CallSiteGetColumnNumber() {
if (this[CallSitePositionKey] == -1) {
return null;
}
var script = %FunctionGetScript(this[CallSiteFunctionKey]);
var location = null;
if (script) {
location = script.locationFromPosition(this[CallSitePositionKey], true);
}
return location ? location.column + 1: null;
}
function CallSiteIsNative() {
var script = %FunctionGetScript(this[CallSiteFunctionKey]);
return script ? (script.type == TYPE_NATIVE) : false;
}
function CallSiteGetPosition() {
return this[CallSitePositionKey];
}
function CallSiteIsConstructor() {
var receiver = this[CallSiteReceiverKey];
var constructor = (receiver != null && IS_OBJECT(receiver))
? %GetDataProperty(receiver, "constructor") : null;
if (!constructor) return false;
return this[CallSiteFunctionKey] === constructor;
}
function CallSiteToString() {
var fileName;
var fileLocation = "";
if (this.isNative()) {
fileLocation = "native";
} else {
if (this.isEval()) {
fileName = this.getScriptNameOrSourceURL();
if (!fileName) {
fileLocation = this.getEvalOrigin();
fileLocation += ", "; // Expecting source position to follow.
}
} else {
fileName = this.getFileName();
}
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(this[CallSiteReceiverKey], true);
var methodName = this.getMethodName();
if (functionName) {
if (typeName &&
%_CallFunction(functionName, typeName, StringIndexOf) != 0) {
line += typeName + ".";
}
line += functionName;
if (methodName &&
(%_CallFunction(functionName, "." + methodName, StringIndexOf) !=
functionName.length - methodName.length - 1)) {
line += " [as " + methodName + "]";
}
} else {
line += typeName + "." + (methodName || "<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 non_strict_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);
non_strict_frames--;
frames.push(new CallSite(recv, fun, pos, (non_strict_frames < 0)));
}
return frames;
}
function FormatStackTrace(error_string, frames) {
var lines = new InternalArray();
lines.push(error_string);
for (var i = 0; i < frames.length; i++) {
var frame = frames[i];
var line;
try {
line = frame.toString();
} catch (e) {
try {
line = "<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;
}
// Flag to prevent recursive call of Error.prepareStackTrace.
var formatting_custom_stack_trace = false;
function captureStackTrace(obj, cons_opt) {
var stackTraceLimit = $Error.stackTraceLimit;
if (!stackTraceLimit || !IS_NUMBER(stackTraceLimit)) return;
if (stackTraceLimit < 0 || stackTraceLimit > 10000) {
stackTraceLimit = 10000;
}
var stack = %CollectStackTrace(obj,
cons_opt ? cons_opt : captureStackTrace,
stackTraceLimit);
// Don't be lazy if the error stack formatting is custom (observable).
if (IS_FUNCTION($Error.prepareStackTrace) && !formatting_custom_stack_trace) {
var array = [];
%MoveArrayContents(GetStackFrames(stack), array);
formatting_custom_stack_trace = true;
try {
obj.stack = $Error.prepareStackTrace(obj, array);
} catch (e) {
throw e; // The custom formatting function threw. Rethrow.
} finally {
formatting_custom_stack_trace = false;
}
return;
}
var error_string = FormatErrorString(obj);
// Note that 'obj' and 'this' maybe different when called on objects that
// have the error object on its prototype chain. The getter replaces itself
// with a data property as soon as the stack trace has been formatted.
// The getter must not change the object layout as it may be called after GC.
var getter = function() {
if (IS_STRING(stack)) return stack;
// Stack is still a raw array awaiting to be formatted.
stack = FormatStackTrace(error_string, GetStackFrames(stack));
// Release context value.
error_string = void 0;
return stack;
};
%MarkOneShotGetter(getter);
// The 'stack' property of the receiver is set as data property. If
// the receiver is the same as holder, this accessor pair is replaced.
var setter = function(v) {
%DefineOrRedefineDataProperty(this, 'stack', v, NONE);
};
%DefineOrRedefineAccessorProperty(obj, 'stack', getter, setter, DONT_ENUM);
}
function SetUpError() {
// Define special error type constructors.
var DefineError = function(f) {
// Store the error function in both the global object
// and the runtime object. The function is fetched
// from the runtime object when throwing errors from
// within the runtime system to avoid strange side
// effects when overwriting the error functions from
// user code.
var name = f.name;
%SetProperty(global, name, f, DONT_ENUM);
%SetProperty(builtins, '$' + name, f, DONT_ENUM | DONT_DELETE | READ_ONLY);
// Configure the error function.
if (name == 'Error') {
// The prototype of the Error object must itself be an error.
// However, it can't be an instance of the Error object because
// it hasn't been properly configured yet. Instead we create a
// special not-a-true-error-but-close-enough object.
var ErrorPrototype = function() {};
%FunctionSetPrototype(ErrorPrototype, $Object.prototype);
%FunctionSetInstanceClassName(ErrorPrototype, 'Error');
%FunctionSetPrototype(f, new ErrorPrototype());
} else {
%FunctionSetPrototype(f, new $Error());
}
%FunctionSetInstanceClassName(f, 'Error');
%SetProperty(f.prototype, 'constructor', f, DONT_ENUM);
%SetProperty(f.prototype, "name", name, DONT_ENUM);
%SetCode(f, function(m) {
if (%_IsConstructCall()) {
// Define all the expected properties directly on the error
// object. This avoids going through getters and setters defined
// on prototype objects.
%IgnoreAttributesAndSetProperty(this, 'stack', void 0, DONT_ENUM);
if (!IS_UNDEFINED(m)) {
%IgnoreAttributesAndSetProperty(
this, 'message', ToString(m), DONT_ENUM);
}
captureStackTrace(this, f);
} else {
return new f(m);
}
});
%SetNativeFlag(f);
};
DefineError(function Error() { });
DefineError(function TypeError() { });
DefineError(function RangeError() { });
DefineError(function SyntaxError() { });
DefineError(function ReferenceError() { });
DefineError(function EvalError() { });
DefineError(function URIError() { });
}
SetUpError();
$Error.captureStackTrace = captureStackTrace;
%SetProperty($Error.prototype, 'message', '', DONT_ENUM);
// Global list of error objects visited during ErrorToString. This is
// used to detect cycles in error toString formatting.
var visited_errors = new InternalArray();
var cyclic_error_marker = new $Object();
function GetPropertyWithoutInvokingMonkeyGetters(error, name) {
// Climb the prototype chain until we find the holder.
while (error && !%HasLocalProperty(error, name)) {
error = %GetPrototype(error);
}
if (error === null) return void 0;
if (!IS_OBJECT(error)) 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(error, name);
if (desc && desc[IS_ACCESSOR_INDEX]) {
var isName = name === "name";
if (error === $ReferenceError.prototype)
return isName ? "ReferenceError" : void 0;
if (error === $SyntaxError.prototype)
return isName ? "SyntaxError" : void 0;
if (error === $TypeError.prototype)
return isName ? "TypeError" : void 0;
}
// Otherwise, read normally.
return error[name];
}
function ErrorToStringDetectCycle(error) {
if (!%PushIfAbsent(visited_errors, error)) throw cyclic_error_marker;
try {
var name = GetPropertyWithoutInvokingMonkeyGetters(error, "name");
name = IS_UNDEFINED(name) ? "Error" : TO_STRING_INLINE(name);
var message = GetPropertyWithoutInvokingMonkeyGetters(error, "message");
message = IS_UNDEFINED(message) ? "" : TO_STRING_INLINE(message);
if (name === "") return message;
if (message === "") return name;
return name + ": " + message;
} finally {
visited_errors.length = visited_errors.length - 1;
}
}
function ErrorToString() {
if (!IS_SPEC_OBJECT(this)) {
throw MakeTypeError("called_on_non_object", ["Error.prototype.toString"]);
}
try {
return ErrorToStringDetectCycle(this);
} catch(e) {
// If this error message was encountered already return the empty
// string for it instead of recursively formatting it.
if (e === cyclic_error_marker) {
return '';
}
throw e;
}
}
InstallFunctions($Error.prototype, DONT_ENUM, ['toString', ErrorToString]);
// Boilerplate for exceptions for stack overflows. Used from
// Isolate::StackOverflow().
function SetUpStackOverflowBoilerplate() {
var boilerplate = MakeRangeError('stack_overflow', []);
// The raw stack trace is stored as hidden property of the copy of this
// boilerplate error object. Note that the receiver 'this' may not be that
// error object copy, but can be found on the prototype chain of 'this'.
// When the stack trace is formatted, this accessor property is replaced by
// a data property.
var error_string = boilerplate.name + ": " + boilerplate.message;
// The getter must not change the object layout as it may be called after GC.
function getter() {
var holder = this;
while (!IS_ERROR(holder)) {
holder = %GetPrototype(holder);
if (holder == null) return MakeSyntaxError('illegal_access', []);
}
var stack = %GetOverflowedStackTrace(holder);
if (IS_STRING(stack)) return stack;
if (IS_ARRAY(stack)) {
var result = FormatStackTrace(error_string, GetStackFrames(stack));
%SetOverflowedStackTrace(holder, result);
return result;
}
return void 0;
}
%MarkOneShotGetter(getter);
// The 'stack' property of the receiver is set as data property. If
// the receiver is the same as holder, this accessor pair is replaced.
function setter(v) {
%DefineOrRedefineDataProperty(this, 'stack', v, NONE);
// Release the stack trace that is stored as hidden property, if exists.
%SetOverflowedStackTrace(this, void 0);
}
%DefineOrRedefineAccessorProperty(
boilerplate, 'stack', getter, setter, DONT_ENUM);
return boilerplate;
}
var kStackOverflowBoilerplate = SetUpStackOverflowBoilerplate();
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