Javascript
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1094行
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39.33 KB
// Copyright 2006-2008 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.
// -------------------------------------------------------------------
//
// Matches Script::Type from objects.h
var TYPE_NATIVE = 0;
var TYPE_EXTENSION = 1;
var TYPE_NORMAL = 2;
// Matches Script::CompilationType from objects.h
var COMPILATION_TYPE_HOST = 0;
var COMPILATION_TYPE_EVAL = 1;
var COMPILATION_TYPE_JSON = 2;
// Matches Messages::kNoLineNumberInfo from v8.h
var kNoLineNumberInfo = 0;
// If this object gets passed to an error constructor the error will
// get an accessor for .message that constructs a descriptive error
// message on access.
var kAddMessageAccessorsMarker = { };
var kMessages = 0;
var kReplacementMarkers = [ "%0", "%1", "%2", "%3" ];
function FormatString(format, message) {
var args = %MessageGetArguments(message);
var result = "";
var arg_num = 0;
for (var i = 0; i < format.length; i++) {
var str = format[i];
for (arg_num = 0; arg_num < kReplacementMarkers.length; arg_num++) {
if (format[i] !== kReplacementMarkers[arg_num]) continue;
try {
str = ToDetailString(args[arg_num]);
} catch (e) {
str = "#<error>";
}
}
result += str;
}
return result;
}
// To check if something is a native error we need to check the
// concrete native error types. It is not enough to check "obj
// instanceof $Error" because user code can replace
// NativeError.prototype.__proto__. User code cannot replace
// NativeError.prototype though and therefore this is a safe test.
function IsNativeErrorObject(obj) {
return (obj instanceof $Error) ||
(obj instanceof $EvalError) ||
(obj instanceof $RangeError) ||
(obj instanceof $ReferenceError) ||
(obj instanceof $SyntaxError) ||
(obj instanceof $TypeError) ||
(obj instanceof $URIError);
}
// When formatting internally created error messages, do not
// invoke overwritten error toString methods but explicitly use
// the error to string method. This is to avoid leaking error
// objects between script tags in a browser setting.
function ToStringCheckErrorObject(obj) {
if (IsNativeErrorObject(obj)) {
return %_CallFunction(obj, errorToString);
} else {
return ToString(obj);
}
}
function ToDetailString(obj) {
if (obj != null && IS_OBJECT(obj) && obj.toString === $Object.prototype.toString) {
var constructor = obj.constructor;
if (!constructor) return ToStringCheckErrorObject(obj);
var constructorName = constructor.name;
if (!constructorName || !IS_STRING(constructorName)) {
return ToStringCheckErrorObject(obj);
}
return "#<" + constructorName + ">";
} else {
return ToStringCheckErrorObject(obj);
}
}
function MakeGenericError(constructor, type, args) {
if (IS_UNDEFINED(args)) {
args = [];
}
var e = new constructor(kAddMessageAccessorsMarker);
e.type = type;
e.arguments = args;
return e;
}
/**
* Setup the Script function and constructor.
*/
%FunctionSetInstanceClassName(Script, 'Script');
%SetProperty(Script.prototype, 'constructor', Script, DONT_ENUM);
%SetCode(Script, function(x) {
// Script objects can only be created by the VM.
throw new $Error("Not supported");
});
// Helper functions; called from the runtime system.
function FormatMessage(message) {
if (kMessages === 0) {
kMessages = {
// Error
cyclic_proto: ["Cyclic __proto__ value"],
// TypeError
unexpected_token: ["Unexpected token ", "%0"],
unexpected_token_number: ["Unexpected number"],
unexpected_token_string: ["Unexpected string"],
unexpected_token_identifier: ["Unexpected identifier"],
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, object is not extensible: ", "%0"],
non_extensible_proto: ["%0", " is not extensible"],
// RangeError
invalid_array_length: ["Invalid array length"],
stack_overflow: ["Maximum call stack size exceeded"],
// SyntaxError
unable_to_parse: ["Parse error"],
duplicate_regexp_flag: ["Duplicate RegExp flag ", "%0"],
invalid_regexp: ["Invalid RegExp pattern /", "%0", "/"],
illegal_break: ["Illegal break statement"],
illegal_continue: ["Illegal continue statement"],
illegal_return: ["Illegal return statement"],
error_loading_debugger: ["Error loading debugger"],
no_input_to_regexp: ["No input to ", "%0"],
invalid_json: ["String '", "%0", "' is not valid JSON"],
circular_structure: ["Converting circular structure to JSON"],
obj_ctor_property_non_object: ["Object.", "%0", " called on non-object"],
array_indexof_not_defined: ["Array.getIndexOf: Argument undefined"],
object_not_extensible: ["Can't add property ", "%0", ", object is not extensible"],
illegal_access: ["Illegal access"],
invalid_preparser_data: ["Invalid preparser data for function ", "%0"],
strict_mode_with: ["Strict mode code may not include a with statement"],
strict_catch_variable: ["Catch variable may not be eval or arguments in strict mode"],
too_many_arguments: ["Too many arguments in function call (only 32766 allowed)"],
too_many_parameters: ["Too many parameters in function definition (only 32766 allowed)"],
too_many_variables: ["Too many variables declared (only 32767 allowed)"],
strict_param_name: ["Parameter name eval or arguments is not allowed in strict mode"],
strict_param_dupe: ["Strict mode function may not have duplicate parameter names"],
strict_var_name: ["Variable name may not be eval or arguments in strict mode"],
strict_function_name: ["Function name may not be eval or arguments in strict mode"],
strict_octal_literal: ["Octal literals are not allowed in strict mode."],
strict_duplicate_property: ["Duplicate data property in object literal not allowed in strict mode"],
accessor_data_property: ["Object literal may not have data and accessor property with the same name"],
accessor_get_set: ["Object literal may not have multiple get/set accessors with the same name"],
strict_lhs_assignment: ["Assignment to eval or arguments is not allowed in strict mode"],
strict_lhs_postfix: ["Postfix increment/decrement may not have eval or arguments operand in strict mode"],
strict_lhs_prefix: ["Prefix increment/decrement may not have eval or arguments operand in strict mode"],
strict_reserved_word: ["Use of future reserved word in strict mode"],
strict_delete: ["Delete of an unqualified identifier in strict mode."],
strict_delete_property: ["Cannot delete property '", "%0", "' of ", "%1"],
strict_const: ["Use of const in strict mode."],
strict_function: ["In strict mode code, functions can only be declared at top level or immediately within another function." ],
strict_read_only_property: ["Cannot assign to read only property '", "%0", "' of ", "%1"],
strict_cannot_assign: ["Cannot assign to read only '", "%0", "' in strict mode"],
strict_arguments_callee: ["Cannot access property 'callee' of strict mode arguments"],
strict_arguments_caller: ["Cannot access property 'caller' of strict mode arguments"],
strict_function_caller: ["Cannot access property 'caller' of a strict mode function"],
strict_function_arguments: ["Cannot access property 'arguments' of a strict mode function"],
strict_caller: ["Illegal access to a strict mode caller function."],
};
}
var message_type = %MessageGetType(message);
var format = kMessages[message_type];
if (!format) return "<unknown message " + message_type + ">";
return FormatString(format, message);
}
function GetLineNumber(message) {
var start_position = %MessageGetStartPosition(message);
if (start_position == -1) return kNoLineNumberInfo;
var script = %MessageGetScript(message);
var location = script.locationFromPosition(start_position, true);
if (location == null) return kNoLineNumberInfo;
return location.line + 1;
}
// Returns the source code line containing the given source
// position, or the empty string if the position is invalid.
function GetSourceLine(message) {
var script = %MessageGetScript(message);
var start_position = %MessageGetStartPosition(message);
var location = script.locationFromPosition(start_position, true);
if (location == null) return "";
location.restrict();
return location.sourceText();
}
function MakeTypeError(type, args) {
return MakeGenericError($TypeError, type, args);
}
function MakeRangeError(type, args) {
return MakeGenericError($RangeError, type, args);
}
function MakeSyntaxError(type, args) {
return MakeGenericError($SyntaxError, type, args);
}
function MakeReferenceError(type, args) {
return MakeGenericError($ReferenceError, type, args);
}
function MakeEvalError(type, args) {
return MakeGenericError($EvalError, type, args);
}
function MakeError(type, args) {
return MakeGenericError($Error, type, args);
}
/**
* Find a line number given a specific source position.
* @param {number} position The source position.
* @return {number} 0 if input too small, -1 if input too large,
else the line number.
*/
Script.prototype.lineFromPosition = function(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.
*/
Script.prototype.locationFromPosition = function (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.
*/
Script.prototype.locationFromLine = function (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
*/
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;
}
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;
}
/**
* 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;
obj.__defineGetter__(name, function () {
if (hasBeenSet) {
return value;
}
hasBeenSet = true;
value = fun(obj);
return value;
});
obj.__defineSetter__(name, function (v) {
hasBeenSet = true;
value = v;
});
}
function CallSite(receiver, fun, pos) {
this.receiver = receiver;
this.fun = fun;
this.pos = pos;
}
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 $Error.prepareStackTrace(error, frames);
} else {
return FormatStackTrace(error, frames);
}
}
function DefineError(f) {
// Store the error function in both the global object
// and the runtime object. The function is fetched
// from the runtime object when throwing errors from
// within the runtime system to avoid strange side
// effects when overwriting the error functions from
// user code.
var name = f.name;
%SetProperty(global, name, f, DONT_ENUM);
this['$' + name] = f;
// 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, READ_ONLY | DONT_DELETE);
%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);
%IgnoreAttributesAndSetProperty(this, 'arguments', void 0);
%IgnoreAttributesAndSetProperty(this, 'type', void 0);
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));
}
captureStackTrace(this, f);
} else {
return new f(m);
}
});
}
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);
});
};
$Math.__proto__ = global.Object.prototype;
DefineError(function Error() { });
DefineError(function TypeError() { });
DefineError(function RangeError() { });
DefineError(function SyntaxError() { });
DefineError(function ReferenceError() { });
DefineError(function EvalError() { });
DefineError(function URIError() { });
$Error.captureStackTrace = captureStackTrace;
// Setup extra properties of the Error.prototype object.
$Error.prototype.message = '';
// Global list of error objects visited during errorToString. This is
// used to detect cycles in error toString formatting.
var visited_errors = new $Array();
var cyclic_error_marker = new $Object();
function errorToStringDetectCycle() {
if (!%PushIfAbsent(visited_errors, this)) throw cyclic_error_marker;
try {
var type = this.type;
if (type && !%_CallFunction(this, "message", ObjectHasOwnProperty)) {
var formatted = FormatMessage(%NewMessageObject(type, this.arguments));
return this.name + ": " + formatted;
}
var message = %_CallFunction(this, "message", ObjectHasOwnProperty)
? (": " + this.message)
: "";
return this.name + message;
} finally {
visited_errors.length = visited_errors.length - 1;
}
}
function errorToString() {
// This helper function is needed because access to properties on
// the builtins object do not work inside of a catch clause.
function isCyclicErrorMarker(o) { return o === cyclic_error_marker; }
try {
return %_CallFunction(this, errorToStringDetectCycle);
} catch(e) {
// If this error message was encountered already return the empty
// string for it instead of recursively formatting it.
if (isCyclicErrorMarker(e)) return '';
else throw e;
}
}
InstallFunctions($Error.prototype, DONT_ENUM, ['toString', errorToString]);
// Boilerplate for exceptions for stack overflows. Used from
// Isolate::StackOverflow().
const kStackOverflowBoilerplate = MakeRangeError('stack_overflow', []);