1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/vm/ErrorObject.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,151 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * vim: set ts=8 sw=4 et tw=78:
1.6 + *
1.7 + * This Source Code Form is subject to the terms of the Mozilla Public
1.8 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.9 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.10 +
1.11 +#include "vm/ErrorObject-inl.h"
1.12 +
1.13 +#include "jsexn.h"
1.14 +
1.15 +#include "vm/GlobalObject.h"
1.16 +
1.17 +#include "jsobjinlines.h"
1.18 +
1.19 +#include "vm/Shape-inl.h"
1.20 +
1.21 +using namespace js;
1.22 +using mozilla::PodZero;
1.23 +
1.24 +/* static */ Shape *
1.25 +js::ErrorObject::assignInitialShape(ExclusiveContext *cx, Handle<ErrorObject*> obj)
1.26 +{
1.27 + MOZ_ASSERT(obj->nativeEmpty());
1.28 +
1.29 + if (!obj->addDataProperty(cx, cx->names().fileName, FILENAME_SLOT, 0))
1.30 + return nullptr;
1.31 + if (!obj->addDataProperty(cx, cx->names().lineNumber, LINENUMBER_SLOT, 0))
1.32 + return nullptr;
1.33 + if (!obj->addDataProperty(cx, cx->names().columnNumber, COLUMNNUMBER_SLOT, 0))
1.34 + return nullptr;
1.35 + return obj->addDataProperty(cx, cx->names().stack, STACK_SLOT, 0);
1.36 +}
1.37 +
1.38 +/* static */ bool
1.39 +js::ErrorObject::init(JSContext *cx, Handle<ErrorObject*> obj, JSExnType type,
1.40 + ScopedJSFreePtr<JSErrorReport> *errorReport, HandleString fileName,
1.41 + HandleString stack, uint32_t lineNumber, uint32_t columnNumber,
1.42 + HandleString message)
1.43 +{
1.44 + // Null out early in case of error, for exn_finalize's sake.
1.45 + obj->initReservedSlot(ERROR_REPORT_SLOT, PrivateValue(nullptr));
1.46 +
1.47 + if (!EmptyShape::ensureInitialCustomShape<ErrorObject>(cx, obj))
1.48 + return false;
1.49 +
1.50 + // The .message property isn't part of the initial shape because it's
1.51 + // present in some error objects -- |Error.prototype|, |new Error("f")|,
1.52 + // |new Error("")| -- but not in others -- |new Error(undefined)|,
1.53 + // |new Error()|.
1.54 + RootedShape messageShape(cx);
1.55 + if (message) {
1.56 + messageShape = obj->addDataProperty(cx, cx->names().message, MESSAGE_SLOT, 0);
1.57 + if (!messageShape)
1.58 + return false;
1.59 + MOZ_ASSERT(messageShape->slot() == MESSAGE_SLOT);
1.60 + }
1.61 +
1.62 + MOZ_ASSERT(obj->nativeLookupPure(NameToId(cx->names().fileName))->slot() == FILENAME_SLOT);
1.63 + MOZ_ASSERT(obj->nativeLookupPure(NameToId(cx->names().lineNumber))->slot() == LINENUMBER_SLOT);
1.64 + MOZ_ASSERT(obj->nativeLookupPure(NameToId(cx->names().columnNumber))->slot() ==
1.65 + COLUMNNUMBER_SLOT);
1.66 + MOZ_ASSERT(obj->nativeLookupPure(NameToId(cx->names().stack))->slot() == STACK_SLOT);
1.67 + MOZ_ASSERT_IF(message,
1.68 + obj->nativeLookupPure(NameToId(cx->names().message))->slot() == MESSAGE_SLOT);
1.69 +
1.70 + MOZ_ASSERT(JSEXN_ERR <= type && type < JSEXN_LIMIT);
1.71 +
1.72 + JSErrorReport *report = errorReport ? errorReport->forget() : nullptr;
1.73 + obj->initReservedSlot(EXNTYPE_SLOT, Int32Value(type));
1.74 + obj->setReservedSlot(ERROR_REPORT_SLOT, PrivateValue(report));
1.75 + obj->initReservedSlot(FILENAME_SLOT, StringValue(fileName));
1.76 + obj->initReservedSlot(LINENUMBER_SLOT, Int32Value(lineNumber));
1.77 + obj->initReservedSlot(COLUMNNUMBER_SLOT, Int32Value(columnNumber));
1.78 + obj->initReservedSlot(STACK_SLOT, StringValue(stack));
1.79 + if (message)
1.80 + obj->nativeSetSlotWithType(cx, messageShape, StringValue(message));
1.81 +
1.82 + if (report && report->originPrincipals)
1.83 + JS_HoldPrincipals(report->originPrincipals);
1.84 +
1.85 + return true;
1.86 +}
1.87 +
1.88 +/* static */ ErrorObject *
1.89 +js::ErrorObject::create(JSContext *cx, JSExnType errorType, HandleString stack,
1.90 + HandleString fileName, uint32_t lineNumber, uint32_t columnNumber,
1.91 + ScopedJSFreePtr<JSErrorReport> *report, HandleString message)
1.92 +{
1.93 + Rooted<JSObject*> proto(cx, GlobalObject::getOrCreateCustomErrorPrototype(cx, cx->global(), errorType));
1.94 + if (!proto)
1.95 + return nullptr;
1.96 +
1.97 + Rooted<ErrorObject*> errObject(cx);
1.98 + {
1.99 + JSObject* obj = NewObjectWithGivenProto(cx, &ErrorObject::class_, proto, nullptr);
1.100 + if (!obj)
1.101 + return nullptr;
1.102 + errObject = &obj->as<ErrorObject>();
1.103 + }
1.104 +
1.105 + if (!ErrorObject::init(cx, errObject, errorType, report, fileName, stack,
1.106 + lineNumber, columnNumber, message))
1.107 + {
1.108 + return nullptr;
1.109 + }
1.110 +
1.111 + return errObject;
1.112 +}
1.113 +
1.114 +JSErrorReport *
1.115 +js::ErrorObject::getOrCreateErrorReport(JSContext *cx)
1.116 +{
1.117 + if (JSErrorReport *r = getErrorReport())
1.118 + return r;
1.119 +
1.120 + // We build an error report on the stack and then use CopyErrorReport to do
1.121 + // the nitty-gritty malloc stuff.
1.122 + JSErrorReport report;
1.123 + PodZero(&report);
1.124 +
1.125 + // Type.
1.126 + JSExnType type_ = type();
1.127 + report.exnType = type_;
1.128 +
1.129 + // Filename.
1.130 + JSAutoByteString filenameStr;
1.131 + if (!filenameStr.encodeLatin1(cx, fileName(cx)))
1.132 + return nullptr;
1.133 + report.filename = filenameStr.ptr();
1.134 +
1.135 + // Coordinates.
1.136 + report.lineno = lineNumber();
1.137 + report.column = columnNumber();
1.138 +
1.139 + // Message. Note that |new Error()| will result in an undefined |message|
1.140 + // slot, so we need to explicitly substitute the empty string in that case.
1.141 + RootedString message(cx, getMessage());
1.142 + if (!message)
1.143 + message = cx->runtime()->emptyString;
1.144 + if (!message->ensureFlat(cx))
1.145 + return nullptr;
1.146 + report.ucmessage = message->asFlat().chars();
1.147 +
1.148 + // Cache and return.
1.149 + JSErrorReport *copy = CopyErrorReport(cx, &report);
1.150 + if (!copy)
1.151 + return nullptr;
1.152 + setReservedSlot(ERROR_REPORT_SLOT, PrivateValue(copy));
1.153 + return copy;
1.154 +}
