v8/src/messages.js
2015-08-28 10:22:41 +00:00

1048 lines
33 KiB
JavaScript

// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// -------------------------------------------------------------------
var $errorToString;
var MakeError;
var MakeEvalError;
var MakeRangeError;
var MakeReferenceError;
var MakeSyntaxError;
var MakeTypeError;
var MakeURIError;
(function(global, utils) {
%CheckIsBootstrapping();
// -------------------------------------------------------------------
// Imports
var ArrayJoin;
var Bool16x8ToString;
var Bool32x4ToString;
var Bool8x16ToString;
var callSiteReceiverSymbol =
utils.ImportNow("call_site_receiver_symbol");
var callSiteFunctionSymbol =
utils.ImportNow("call_site_function_symbol");
var callSitePositionSymbol =
utils.ImportNow("call_site_position_symbol");
var callSiteStrictSymbol =
utils.ImportNow("call_site_strict_symbol");
var Float32x4ToString;
var formattedStackTraceSymbol =
utils.ImportNow("formatted_stack_trace_symbol");
var FunctionSourceString
var GlobalObject = global.Object;
var Int16x8ToString;
var Int32x4ToString;
var Int8x16ToString;
var InternalArray = utils.InternalArray;
var internalErrorSymbol = utils.ImportNow("internal_error_symbol");
var ObjectDefineProperty;
var ObjectToString;
var stackTraceSymbol = utils.ImportNow("stack_trace_symbol");
var StringCharAt;
var StringIndexOf;
var StringSubstring;
var SymbolToString;
var ToString = utils.ImportNow("ToString");
var Uint16x8ToString;
var Uint32x4ToString;
var Uint8x16ToString;
utils.Import(function(from) {
ArrayJoin = from.ArrayJoin;
Bool16x8ToString = from.Bool16x8ToString;
Bool32x4ToString = from.Bool32x4ToString;
Bool8x16ToString = from.Bool8x16ToString;
Float32x4ToString = from.Float32x4ToString;
FunctionSourceString = from.FunctionSourceString;
Int16x8ToString = from.Int16x8ToString;
Int32x4ToString = from.Int32x4ToString;
Int8x16ToString = from.Int8x16ToString;
ObjectDefineProperty = from.ObjectDefineProperty;
ObjectToString = from.ObjectToString;
StringCharAt = from.StringCharAt;
StringIndexOf = from.StringIndexOf;
StringSubstring = from.StringSubstring;
SymbolToString = from.SymbolToString;
Uint16x8ToString = from.Uint16x8ToString;
Uint32x4ToString = from.Uint32x4ToString;
Uint8x16ToString = from.Uint8x16ToString;
});
// -------------------------------------------------------------------
var GlobalError;
var GlobalTypeError;
var GlobalRangeError;
var GlobalURIError;
var GlobalSyntaxError;
var GlobalReferenceError;
var GlobalEvalError;
function NoSideEffectsObjectToString() {
if (IS_UNDEFINED(this)) return "[object Undefined]";
if (IS_NULL(this)) return "[object Null]";
return "[object " + %_ClassOf(TO_OBJECT(this)) + "]";
}
function NoSideEffectToString(obj) {
if (IS_STRING(obj)) return obj;
if (IS_NUMBER(obj)) return %_NumberToString(obj);
if (IS_BOOLEAN(obj)) return obj ? 'true' : 'false';
if (IS_UNDEFINED(obj)) return 'undefined';
if (IS_NULL(obj)) return 'null';
if (IS_FUNCTION(obj)) {
var str = %_CallFunction(obj, obj, FunctionSourceString);
if (str.length > 128) {
str = %_SubString(str, 0, 111) + "...<omitted>..." +
%_SubString(str, str.length - 2, str.length);
}
return str;
}
if (IS_SYMBOL(obj)) return %_CallFunction(obj, SymbolToString);
if (IS_SIMD_VALUE(obj)) {
switch (typeof(obj)) {
case 'float32x4': return %_CallFunction(obj, Float32x4ToString);
case 'int32x4': return %_CallFunction(obj, Int32x4ToString);
case 'int16x8': return %_CallFunction(obj, Int16x8ToString);
case 'int8x16': return %_CallFunction(obj, Int8x16ToString);
case 'uint32x4': return %_CallFunction(obj, Uint32x4ToString);
case 'uint16x8': return %_CallFunction(obj, Uint16x8ToString);
case 'uint8x16': return %_CallFunction(obj, Uint8x16ToString);
case 'bool32x4': return %_CallFunction(obj, Bool32x4ToString);
case 'bool16x8': return %_CallFunction(obj, Bool16x8ToString);
case 'bool8x16': return %_CallFunction(obj, Bool8x16ToString);
}
}
if (IS_OBJECT(obj)
&& %GetDataProperty(obj, "toString") === ObjectToString) {
var constructor = %GetDataProperty(obj, "constructor");
if (typeof constructor == "function") {
var constructorName = constructor.name;
if (IS_STRING(constructorName) && constructorName !== "") {
return "#<" + constructorName + ">";
}
}
}
if (CanBeSafelyTreatedAsAnErrorObject(obj)) {
return %_CallFunction(obj, ErrorToString);
}
return %_CallFunction(obj, NoSideEffectsObjectToString);
}
// To determine whether we can safely stringify an object using ErrorToString
// without the risk of side-effects, we need to check whether the object is
// either an instance of a native error type (via '%_ClassOf'), or has Error
// in its prototype chain and hasn't overwritten 'toString' with something
// strange and unusual.
function CanBeSafelyTreatedAsAnErrorObject(obj) {
switch (%_ClassOf(obj)) {
case 'Error':
case 'EvalError':
case 'RangeError':
case 'ReferenceError':
case 'SyntaxError':
case 'TypeError':
case 'URIError':
return true;
}
var objToString = %GetDataProperty(obj, "toString");
return obj instanceof GlobalError && objToString === ErrorToString;
}
// When formatting internally created error messages, do not
// invoke overwritten error toString methods but explicitly use
// the error to string method. This is to avoid leaking error
// objects between script tags in a browser setting.
function ToStringCheckErrorObject(obj) {
if (CanBeSafelyTreatedAsAnErrorObject(obj)) {
return %_CallFunction(obj, ErrorToString);
} else {
return ToString(obj);
}
}
function ToDetailString(obj) {
if (obj != null && IS_OBJECT(obj) && obj.toString === ObjectToString) {
var constructor = obj.constructor;
if (typeof constructor == "function") {
var constructorName = constructor.name;
if (IS_STRING(constructorName) && constructorName !== "") {
return "#<" + constructorName + ">";
}
}
}
return ToStringCheckErrorObject(obj);
}
function MakeGenericError(constructor, type, arg0, arg1, arg2) {
var error = new constructor(FormatMessage(type, arg0, arg1, arg2));
error[internalErrorSymbol] = true;
return error;
}
/**
* Set up the Script function and constructor.
*/
%FunctionSetInstanceClassName(Script, 'Script');
%AddNamedProperty(Script.prototype, 'constructor', Script,
DONT_ENUM | DONT_DELETE | READ_ONLY);
%SetCode(Script, function(x) {
// Script objects can only be created by the VM.
throw MakeError(kUnsupported);
});
// Helper functions; called from the runtime system.
function FormatMessage(type, arg0, arg1, arg2) {
var arg0 = NoSideEffectToString(arg0);
var arg1 = NoSideEffectToString(arg1);
var arg2 = NoSideEffectToString(arg2);
try {
return %FormatMessageString(type, arg0, arg1, arg2);
} catch (e) {
return "<error>";
}
}
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 offset of the given position within the containing line.
function GetColumnNumber(message) {
var script = %MessageGetScript(message);
var start_position = %MessageGetStartPosition(message);
var location = script.locationFromPosition(start_position, true);
if (location == null) return -1;
return location.column;
}
// 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 "";
return location.sourceText();
}
/**
* 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;
}
/**
* Returns the position of the nth line end.
* @return {number}
* Zero-based position of the nth line end in the script.
*/
function ScriptLineEnd(n) {
return this.line_ends[n];
}
/**
* If sourceURL comment is available 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.source_url) return this.source_url;
return this.name;
}
utils.SetUpLockedPrototype(Script, [
"source",
"name",
"source_url",
"source_mapping_url",
"line_ends",
"line_offset",
"column_offset"
], [
"lineFromPosition", ScriptLineFromPosition,
"locationFromPosition", ScriptLocationFromPosition,
"locationFromLine", ScriptLocationFromLine,
"sourceSlice", ScriptSourceSlice,
"sourceLine", ScriptSourceLine,
"lineCount", ScriptLineCount,
"nameOrSourceURL", ScriptNameOrSourceURL,
"lineEnd", ScriptLineEnd
]
);
/**
* 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;
}
/**
* 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);
}
utils.SetUpLockedPrototype(SourceLocation,
["script", "position", "line", "column", "start", "end"],
["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);
}
utils.SetUpLockedPrototype(SourceSlice,
["script", "from_line", "to_line", "from_position", "to_position"],
["sourceText", SourceSliceSourceText]
);
function GetStackTraceLine(recv, fun, pos, isGlobal) {
return new CallSite(recv, fun, pos, false).toString();
}
// ----------------------------------------------------------------------------
// Error implementation
function CallSite(receiver, fun, pos, strict_mode) {
SET_PRIVATE(this, callSiteReceiverSymbol, receiver);
SET_PRIVATE(this, callSiteFunctionSymbol, fun);
SET_PRIVATE(this, callSitePositionSymbol, pos);
SET_PRIVATE(this, callSiteStrictSymbol, strict_mode);
}
function CallSiteGetThis() {
return GET_PRIVATE(this, callSiteStrictSymbol)
? UNDEFINED : GET_PRIVATE(this, callSiteReceiverSymbol);
}
function CallSiteGetFunction() {
return GET_PRIVATE(this, callSiteStrictSymbol)
? UNDEFINED : GET_PRIVATE(this, callSiteFunctionSymbol);
}
function CallSiteGetPosition() {
return GET_PRIVATE(this, callSitePositionSymbol);
}
function CallSiteGetTypeName() {
return GetTypeName(GET_PRIVATE(this, callSiteReceiverSymbol), false);
}
function CallSiteIsToplevel() {
return %CallSiteIsToplevelRT(this);
}
function CallSiteIsEval() {
return %CallSiteIsEvalRT(this);
}
function CallSiteGetEvalOrigin() {
var script = %FunctionGetScript(GET_PRIVATE(this, callSiteFunctionSymbol));
return FormatEvalOrigin(script);
}
function CallSiteGetScriptNameOrSourceURL() {
return %CallSiteGetScriptNameOrSourceUrlRT(this);
}
function CallSiteGetFunctionName() {
// See if the function knows its own name
return %CallSiteGetFunctionNameRT(this);
}
function CallSiteGetMethodName() {
// See if we can find a unique property on the receiver that holds
// this function.
return %CallSiteGetMethodNameRT(this);
}
function CallSiteGetFileName() {
return %CallSiteGetFileNameRT(this);
}
function CallSiteGetLineNumber() {
return %CallSiteGetLineNumberRT(this);
}
function CallSiteGetColumnNumber() {
return %CallSiteGetColumnNumberRT(this);
}
function CallSiteIsNative() {
return %CallSiteIsNativeRT(this);
}
function CallSiteIsConstructor() {
return %CallSiteIsConstructorRT(this);
}
function CallSiteToString() {
var fileName;
var fileLocation = "";
if (this.isNative()) {
fileLocation = "native";
} else {
fileName = this.getScriptNameOrSourceURL();
if (!fileName && this.isEval()) {
fileLocation = this.getEvalOrigin();
fileLocation += ", "; // Expecting source position to follow.
}
if (fileName) {
fileLocation += fileName;
} else {
// Source code does not originate from a file and is not native, but we
// can still get the source position inside the source string, e.g. in
// an eval string.
fileLocation += "<anonymous>";
}
var lineNumber = this.getLineNumber();
if (lineNumber != null) {
fileLocation += ":" + lineNumber;
var columnNumber = this.getColumnNumber();
if (columnNumber) {
fileLocation += ":" + columnNumber;
}
}
}
var line = "";
var functionName = this.getFunctionName();
var addSuffix = true;
var isConstructor = this.isConstructor();
var isMethodCall = !(this.isToplevel() || isConstructor);
if (isMethodCall) {
var typeName = GetTypeName(GET_PRIVATE(this, callSiteReceiverSymbol), 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;
}
utils.SetUpLockedPrototype(CallSite, ["receiver", "fun", "pos"], [
"getThis", CallSiteGetThis,
"getTypeName", CallSiteGetTypeName,
"isToplevel", CallSiteIsToplevel,
"isEval", CallSiteIsEval,
"getEvalOrigin", CallSiteGetEvalOrigin,
"getScriptNameOrSourceURL", CallSiteGetScriptNameOrSourceURL,
"getFunction", CallSiteGetFunction,
"getFunctionName", CallSiteGetFunctionName,
"getMethodName", CallSiteGetMethodName,
"getFileName", CallSiteGetFileName,
"getLineNumber", CallSiteGetLineNumber,
"getColumnNumber", CallSiteGetColumnNumber,
"isNative", CallSiteIsNative,
"getPosition", CallSiteGetPosition,
"isConstructor", CallSiteIsConstructor,
"toString", CallSiteToString
]);
function FormatEvalOrigin(script) {
var sourceURL = script.nameOrSourceURL();
if (sourceURL) {
return sourceURL;
}
var eval_origin = "eval at ";
if (script.eval_from_function_name) {
eval_origin += script.eval_from_function_name;
} else {
eval_origin += "<anonymous>";
}
var eval_from_script = script.eval_from_script;
if (eval_from_script) {
if (eval_from_script.compilation_type == COMPILATION_TYPE_EVAL) {
// eval script originated from another eval.
eval_origin += " (" + FormatEvalOrigin(eval_from_script) + ")";
} else {
// eval script originated from "real" source.
if (eval_from_script.name) {
eval_origin += " (" + eval_from_script.name;
var location = eval_from_script.locationFromPosition(
script.eval_from_script_position, true);
if (location) {
eval_origin += ":" + (location.line + 1);
eval_origin += ":" + (location.column + 1);
}
eval_origin += ")";
} else {
eval_origin += " (unknown source)";
}
}
}
return eval_origin;
}
function FormatErrorString(error) {
try {
return %_CallFunction(error, ErrorToString);
} catch (e) {
try {
return "<error: " + e + ">";
} catch (ee) {
return "<error>";
}
}
}
function GetStackFrames(raw_stack) {
var frames = new InternalArray();
var sloppy_frames = raw_stack[0];
for (var i = 1; i < raw_stack.length; i += 4) {
var recv = raw_stack[i];
var fun = raw_stack[i + 1];
var code = raw_stack[i + 2];
var pc = raw_stack[i + 3];
var pos = %_IsSmi(code) ? code : %FunctionGetPositionForOffset(code, pc);
sloppy_frames--;
frames.push(new CallSite(recv, fun, pos, (sloppy_frames < 0)));
}
return frames;
}
// Flag to prevent recursive call of Error.prepareStackTrace.
var formatting_custom_stack_trace = false;
function FormatStackTrace(obj, raw_stack) {
var frames = GetStackFrames(raw_stack);
if (IS_FUNCTION(GlobalError.prepareStackTrace) &&
!formatting_custom_stack_trace) {
var array = [];
%MoveArrayContents(frames, array);
formatting_custom_stack_trace = true;
var stack_trace = UNDEFINED;
try {
stack_trace = GlobalError.prepareStackTrace(obj, array);
} catch (e) {
throw e; // The custom formatting function threw. Rethrow.
} finally {
formatting_custom_stack_trace = false;
}
return stack_trace;
}
var lines = new InternalArray();
lines.push(FormatErrorString(obj));
for (var i = 0; i < frames.length; i++) {
var frame = frames[i];
var line;
try {
line = frame.toString();
} catch (e) {
try {
line = "<error: " + e + ">";
} catch (ee) {
// Any code that reaches this point is seriously nasty!
line = "<error>";
}
}
lines.push(" at " + line);
}
return %_CallFunction(lines, "\n", ArrayJoin);
}
function GetTypeName(receiver, requireConstructor) {
if (IS_NULL_OR_UNDEFINED(receiver)) return null;
var constructor = receiver.constructor;
if (!constructor) {
return requireConstructor ? null :
%_CallFunction(receiver, NoSideEffectsObjectToString);
}
var constructorName = constructor.name;
if (!constructorName) {
return requireConstructor ? null :
%_CallFunction(receiver, NoSideEffectsObjectToString);
}
return constructorName;
}
// Format the stack trace if not yet done, and return it.
// Cache the formatted stack trace on the holder.
var StackTraceGetter = function() {
var formatted_stack_trace = UNDEFINED;
var holder = this;
while (holder) {
var formatted_stack_trace =
GET_PRIVATE(holder, formattedStackTraceSymbol);
if (IS_UNDEFINED(formatted_stack_trace)) {
// No formatted stack trace available.
var stack_trace = GET_PRIVATE(holder, stackTraceSymbol);
if (IS_UNDEFINED(stack_trace)) {
// Neither formatted nor structured stack trace available.
// Look further up the prototype chain.
holder = %_GetPrototype(holder);
continue;
}
formatted_stack_trace = FormatStackTrace(holder, stack_trace);
SET_PRIVATE(holder, stackTraceSymbol, UNDEFINED);
SET_PRIVATE(holder, formattedStackTraceSymbol, formatted_stack_trace);
}
return formatted_stack_trace;
}
return UNDEFINED;
};
// If the receiver equals the holder, set the formatted stack trace that the
// getter returns.
var StackTraceSetter = function(v) {
if (HAS_PRIVATE(this, stackTraceSymbol)) {
SET_PRIVATE(this, stackTraceSymbol, UNDEFINED);
SET_PRIVATE(this, formattedStackTraceSymbol, v);
}
};
// Use a dummy function since we do not actually want to capture a stack trace
// when constructing the initial Error prototytpes.
var captureStackTrace = function() {};
// Define special error type constructors.
function DefineError(global, f) {
// Store the error function in both the global object
// and the runtime object. The function is fetched
// from the runtime object when throwing errors from
// within the runtime system to avoid strange side
// effects when overwriting the error functions from
// user code.
var name = f.name;
%AddNamedProperty(global, name, f, DONT_ENUM);
// 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, GlobalObject.prototype);
%FunctionSetInstanceClassName(ErrorPrototype, 'Error');
%FunctionSetPrototype(f, new ErrorPrototype());
} else {
%FunctionSetPrototype(f, new GlobalError());
%InternalSetPrototype(f, GlobalError);
}
%FunctionSetInstanceClassName(f, 'Error');
%AddNamedProperty(f.prototype, 'constructor', f, DONT_ENUM);
%AddNamedProperty(f.prototype, 'name', name, DONT_ENUM);
%SetCode(f, function(m) {
if (%_IsConstructCall()) {
try { captureStackTrace(this, f); } catch (e) { }
// Define all the expected properties directly on the error
// object. This avoids going through getters and setters defined
// on prototype objects.
if (!IS_UNDEFINED(m)) {
%AddNamedProperty(this, 'message', ToString(m), DONT_ENUM);
}
} else {
return new f(m);
}
});
%SetNativeFlag(f);
return f;
};
GlobalError = DefineError(global, function Error() { });
GlobalEvalError = DefineError(global, function EvalError() { });
GlobalRangeError = DefineError(global, function RangeError() { });
GlobalReferenceError = DefineError(global, function ReferenceError() { });
GlobalSyntaxError = DefineError(global, function SyntaxError() { });
GlobalTypeError = DefineError(global, function TypeError() { });
GlobalURIError = DefineError(global, function URIError() { });
%AddNamedProperty(GlobalError.prototype, 'message', '', DONT_ENUM);
function ErrorToString() {
if (!IS_SPEC_OBJECT(this)) {
throw MakeTypeError(kCalledOnNonObject, "Error.prototype.toString");
}
return %ErrorToStringRT(this);
}
utils.InstallFunctions(GlobalError.prototype, DONT_ENUM,
['toString', ErrorToString]);
$errorToString = ErrorToString;
MakeError = function(type, arg0, arg1, arg2) {
return MakeGenericError(GlobalError, type, arg0, arg1, arg2);
}
MakeRangeError = function(type, arg0, arg1, arg2) {
return MakeGenericError(GlobalRangeError, type, arg0, arg1, arg2);
}
MakeSyntaxError = function(type, arg0, arg1, arg2) {
return MakeGenericError(GlobalSyntaxError, type, arg0, arg1, arg2);
}
MakeTypeError = function(type, arg0, arg1, arg2) {
return MakeGenericError(GlobalTypeError, type, arg0, arg1, arg2);
}
MakeURIError = function() {
return MakeGenericError(GlobalURIError, kURIMalformed);
}
// Boilerplate for exceptions for stack overflows. Used from
// Isolate::StackOverflow().
var StackOverflowBoilerplate = MakeRangeError(kStackOverflow);
%DefineAccessorPropertyUnchecked(StackOverflowBoilerplate, 'stack',
StackTraceGetter, StackTraceSetter,
DONT_ENUM);
// Define actual captureStackTrace function after everything has been set up.
captureStackTrace = function captureStackTrace(obj, cons_opt) {
// Define accessors first, as this may fail and throw.
ObjectDefineProperty(obj, 'stack', { get: StackTraceGetter,
set: StackTraceSetter,
configurable: true });
%CollectStackTrace(obj, cons_opt ? cons_opt : captureStackTrace);
};
GlobalError.captureStackTrace = captureStackTrace;
%InstallToContext([
"error_function", GlobalError,
"eval_error_function", GlobalEvalError,
"get_stack_trace_line_fun", GetStackTraceLine,
"make_error_function", MakeGenericError,
"make_range_error", MakeRangeError,
"make_type_error", MakeTypeError,
"message_get_column_number", GetColumnNumber,
"message_get_line_number", GetLineNumber,
"message_get_source_line", GetSourceLine,
"no_side_effect_to_string_fun", NoSideEffectToString,
"range_error_function", GlobalRangeError,
"reference_error_function", GlobalReferenceError,
"stack_overflow_boilerplate", StackOverflowBoilerplate,
"syntax_error_function", GlobalSyntaxError,
"to_detail_string_fun", ToDetailString,
"type_error_function", GlobalTypeError,
"uri_error_function", GlobalURIError,
]);
});