// 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;
// Lazily initialized.
var kVowelSounds = 0;
var kCapitalVowelSounds = 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 = { };
function GetInstanceName(cons) {
if (cons.length == 0) {
return "";
}
var first = %StringToLowerCase(StringCharAt.call(cons, 0));
if (kVowelSounds === 0) {
kVowelSounds = {a: true, e: true, i: true, o: true, u: true, y: true};
kCapitalVowelSounds = {a: true, e: true, i: true, o: true, u: true, h: true,
f: true, l: true, m: true, n: true, r: true, s: true, x: true, y: true};
}
var vowel_mapping = kVowelSounds;
if (cons.length > 1 && (StringCharAt.call(cons, 0) != first)) {
// First char is upper case
var second = %StringToLowerCase(StringCharAt.call(cons, 1));
// Second char is upper case
if (StringCharAt.call(cons, 1) != second) {
vowel_mapping = kCapitalVowelSounds;
}
}
var s = vowel_mapping[first] ? "an " : "a ";
return s + cons;
}
var kMessages = 0;
function FormatString(format, args) {
var result = format;
for (var i = 0; i < args.length; i++) {
var str;
try { str = ToDetailString(args[i]); }
catch (e) { str = "#<error>"; }
result = ArrayJoin.call(StringSplit.call(result, "%" + i), str);
}
return result;
}
function ToDetailString(obj) {
if (obj != null && IS_OBJECT(obj) && obj.toString === $Object.prototype.toString) {
var constructor = obj.constructor;
if (!constructor) return ToString(obj);
var constructorName = constructor.name;
if (!constructorName) return ToString(obj);
return "#<" + GetInstanceName(constructorName) + ">";
} else {
return ToString(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_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",
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",
// RangeError
invalid_array_length: "Invalid array length",
stack_overflow: "Maximum call stack size exceeded",
apply_overflow: "Function.prototype.apply cannot support %0 arguments",
// 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",
result_not_primitive: "Result of %0 must be a primitive, was %1",
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"
};
}
var format = kMessages[message.type];
if (!format) return "<unknown message " + message.type + ">";
return FormatString(format, message.args);
}
function GetLineNumber(message) {
if (message.startPos == -1) return -1;
var location = message.script.locationFromPosition(message.startPos, true);
if (location == null) return -1;
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 location = message.script.locationFromPosition(message.startPos, 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 && StringCharAt.call(this.source, end - 1) == '\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 StringSubstring.call(this.source, start, end);
}
/**
* 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;
};
/**
* 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 StringSubstring.call(this.script.source, this.start, this.end);
};
/**
* 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 StringSubstring.call(this.script.source, this.from_position, this.to_position);
};
// Returns the offset of the given position within the containing
// line.
function GetPositionInLine(message) {
var location = message.script.locationFromPosition(message.startPos, false);
if (location == null) return -1;
location.restrict();
return message.startPos - location.start;
}
function ErrorMessage(type, args, startPos, endPos, script, stackTrace) {
this.startPos = startPos;
this.endPos = endPos;
this.type = type;
this.args = args;
this.script = script;
this.stackTrace = stackTrace;
}
function MakeMessage(type, args, startPos, endPos, script, stackTrace) {
return new ErrorMessage(type, args, startPos, endPos, script, stackTrace);
}
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 $Object.prototype.toString.call(this.receiver);
var constructorName = constructor.name;
if (!constructorName)
return $Object.prototype.toString.call(this.receiver);
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.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 && 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[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 eval_origin = "";
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 += " (eval at " + FormatEvalOrigin(eval_from_script) + ")";
} else {
// eval script originated from "real" scource.
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 fileLocation = "";
if (frame.isNative()) {
fileLocation = "native";
} else if (frame.isEval()) {
fileLocation = "eval at " + frame.getEvalOrigin();
} else {
var 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 methodName = frame.getMethodName();
var addPrefix = true;
var isConstructor = frame.isConstructor();
var isMethodCall = !(frame.isToplevel() || isConstructor);
if (isMethodCall) {
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 += 3) {
var recv = raw_stack[i];
var fun = raw_stack[i+1];
var pc = raw_stack[i+2];
var pos = %FunctionGetPositionForOffset(fun, 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);
f.prototype.name = name;
%SetCode(f, function(m) {
if (%_IsConstructCall()) {
if (m === kAddMessageAccessorsMarker) {
DefineOneShotAccessor(this, 'message', function (obj) {
return FormatMessage({type: obj.type, args: obj.arguments});
});
} else if (!IS_UNDEFINED(m)) {
this.message = ToString(m);
}
captureStackTrace(this, f);
} else {
return new f(m);
}
});
}
function captureStackTrace(obj, cons_opt) {
var stackTraceLimit = $Error.stackTraceLimit;
if (!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.
$Error.prototype.message = '';
%SetProperty($Error.prototype, 'toString', function toString() {
var type = this.type;
if (type && !this.hasOwnProperty("message")) {
return this.name + ": " + FormatMessage({ type: type, args: this.arguments });
}
var message = this.message;
return this.name + (message ? (": " + message) : "");
}, DONT_ENUM);
// Boilerplate for exceptions for stack overflows. Used from
// Top::StackOverflow().
const kStackOverflowBoilerplate = MakeRangeError('stack_overflow', []);