The Tor Browser / annotate

js/src/vm/ErrorObject.cpp@6474c204b198 (annotated)

js/src/vm/ErrorObject.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Wed, 31 Dec 2014 06:09:35 +0100
changeset 0
6474c204b198
permissions
-rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

michael@0 1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0 2 * vim: set ts=8 sw=4 et tw=78:
michael@0 3 *
michael@0 4 * This Source Code Form is subject to the terms of the Mozilla Public
michael@0 5 * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0 6 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0 7
michael@0 8 #include "vm/ErrorObject-inl.h"
michael@0 9
michael@0 10 #include "jsexn.h"
michael@0 11
michael@0 12 #include "vm/GlobalObject.h"
michael@0 13
michael@0 14 #include "jsobjinlines.h"
michael@0 15
michael@0 16 #include "vm/Shape-inl.h"
michael@0 17
michael@0 18 using namespace js;
michael@0 19 using mozilla::PodZero;
michael@0 20
michael@0 21 /* static */ Shape *
michael@0 22 js::ErrorObject::assignInitialShape(ExclusiveContext *cx, Handle<ErrorObject*> obj)
michael@0 23 {
michael@0 24 MOZ_ASSERT(obj->nativeEmpty());
michael@0 25
michael@0 26 if (!obj->addDataProperty(cx, cx->names().fileName, FILENAME_SLOT, 0))
michael@0 27 return nullptr;
michael@0 28 if (!obj->addDataProperty(cx, cx->names().lineNumber, LINENUMBER_SLOT, 0))
michael@0 29 return nullptr;
michael@0 30 if (!obj->addDataProperty(cx, cx->names().columnNumber, COLUMNNUMBER_SLOT, 0))
michael@0 31 return nullptr;
michael@0 32 return obj->addDataProperty(cx, cx->names().stack, STACK_SLOT, 0);
michael@0 33 }
michael@0 34
michael@0 35 /* static */ bool
michael@0 36 js::ErrorObject::init(JSContext *cx, Handle<ErrorObject*> obj, JSExnType type,
michael@0 37 ScopedJSFreePtr<JSErrorReport> *errorReport, HandleString fileName,
michael@0 38 HandleString stack, uint32_t lineNumber, uint32_t columnNumber,
michael@0 39 HandleString message)
michael@0 40 {
michael@0 41 // Null out early in case of error, for exn_finalize's sake.
michael@0 42 obj->initReservedSlot(ERROR_REPORT_SLOT, PrivateValue(nullptr));
michael@0 43
michael@0 44 if (!EmptyShape::ensureInitialCustomShape<ErrorObject>(cx, obj))
michael@0 45 return false;
michael@0 46
michael@0 47 // The .message property isn't part of the initial shape because it's
michael@0 48 // present in some error objects -- |Error.prototype|, |new Error("f")|,
michael@0 49 // |new Error("")| -- but not in others -- |new Error(undefined)|,
michael@0 50 // |new Error()|.
michael@0 51 RootedShape messageShape(cx);
michael@0 52 if (message) {
michael@0 53 messageShape = obj->addDataProperty(cx, cx->names().message, MESSAGE_SLOT, 0);
michael@0 54 if (!messageShape)
michael@0 55 return false;
michael@0 56 MOZ_ASSERT(messageShape->slot() == MESSAGE_SLOT);
michael@0 57 }
michael@0 58
michael@0 59 MOZ_ASSERT(obj->nativeLookupPure(NameToId(cx->names().fileName))->slot() == FILENAME_SLOT);
michael@0 60 MOZ_ASSERT(obj->nativeLookupPure(NameToId(cx->names().lineNumber))->slot() == LINENUMBER_SLOT);
michael@0 61 MOZ_ASSERT(obj->nativeLookupPure(NameToId(cx->names().columnNumber))->slot() ==
michael@0 62 COLUMNNUMBER_SLOT);
michael@0 63 MOZ_ASSERT(obj->nativeLookupPure(NameToId(cx->names().stack))->slot() == STACK_SLOT);
michael@0 64 MOZ_ASSERT_IF(message,
michael@0 65 obj->nativeLookupPure(NameToId(cx->names().message))->slot() == MESSAGE_SLOT);
michael@0 66
michael@0 67 MOZ_ASSERT(JSEXN_ERR <= type && type < JSEXN_LIMIT);
michael@0 68
michael@0 69 JSErrorReport *report = errorReport ? errorReport->forget() : nullptr;
michael@0 70 obj->initReservedSlot(EXNTYPE_SLOT, Int32Value(type));
michael@0 71 obj->setReservedSlot(ERROR_REPORT_SLOT, PrivateValue(report));
michael@0 72 obj->initReservedSlot(FILENAME_SLOT, StringValue(fileName));
michael@0 73 obj->initReservedSlot(LINENUMBER_SLOT, Int32Value(lineNumber));
michael@0 74 obj->initReservedSlot(COLUMNNUMBER_SLOT, Int32Value(columnNumber));
michael@0 75 obj->initReservedSlot(STACK_SLOT, StringValue(stack));
michael@0 76 if (message)
michael@0 77 obj->nativeSetSlotWithType(cx, messageShape, StringValue(message));
michael@0 78
michael@0 79 if (report && report->originPrincipals)
michael@0 80 JS_HoldPrincipals(report->originPrincipals);
michael@0 81
michael@0 82 return true;
michael@0 83 }
michael@0 84
michael@0 85 /* static */ ErrorObject *
michael@0 86 js::ErrorObject::create(JSContext *cx, JSExnType errorType, HandleString stack,
michael@0 87 HandleString fileName, uint32_t lineNumber, uint32_t columnNumber,
michael@0 88 ScopedJSFreePtr<JSErrorReport> *report, HandleString message)
michael@0 89 {
michael@0 90 Rooted<JSObject*> proto(cx, GlobalObject::getOrCreateCustomErrorPrototype(cx, cx->global(), errorType));
michael@0 91 if (!proto)
michael@0 92 return nullptr;
michael@0 93
michael@0 94 Rooted<ErrorObject*> errObject(cx);
michael@0 95 {
michael@0 96 JSObject* obj = NewObjectWithGivenProto(cx, &ErrorObject::class_, proto, nullptr);
michael@0 97 if (!obj)
michael@0 98 return nullptr;
michael@0 99 errObject = &obj->as<ErrorObject>();
michael@0 100 }
michael@0 101
michael@0 102 if (!ErrorObject::init(cx, errObject, errorType, report, fileName, stack,
michael@0 103 lineNumber, columnNumber, message))
michael@0 104 {
michael@0 105 return nullptr;
michael@0 106 }
michael@0 107
michael@0 108 return errObject;
michael@0 109 }
michael@0 110
michael@0 111 JSErrorReport *
michael@0 112 js::ErrorObject::getOrCreateErrorReport(JSContext *cx)
michael@0 113 {
michael@0 114 if (JSErrorReport *r = getErrorReport())
michael@0 115 return r;
michael@0 116
michael@0 117 // We build an error report on the stack and then use CopyErrorReport to do
michael@0 118 // the nitty-gritty malloc stuff.
michael@0 119 JSErrorReport report;
michael@0 120 PodZero(&report);
michael@0 121
michael@0 122 // Type.
michael@0 123 JSExnType type_ = type();
michael@0 124 report.exnType = type_;
michael@0 125
michael@0 126 // Filename.
michael@0 127 JSAutoByteString filenameStr;
michael@0 128 if (!filenameStr.encodeLatin1(cx, fileName(cx)))
michael@0 129 return nullptr;
michael@0 130 report.filename = filenameStr.ptr();
michael@0 131
michael@0 132 // Coordinates.
michael@0 133 report.lineno = lineNumber();
michael@0 134 report.column = columnNumber();
michael@0 135
michael@0 136 // Message. Note that |new Error()| will result in an undefined |message|
michael@0 137 // slot, so we need to explicitly substitute the empty string in that case.
michael@0 138 RootedString message(cx, getMessage());
michael@0 139 if (!message)
michael@0 140 message = cx->runtime()->emptyString;
michael@0 141 if (!message->ensureFlat(cx))
michael@0 142 return nullptr;
michael@0 143 report.ucmessage = message->asFlat().chars();
michael@0 144
michael@0 145 // Cache and return.
michael@0 146 JSErrorReport *copy = CopyErrorReport(cx, &report);
michael@0 147 if (!copy)
michael@0 148 return nullptr;
michael@0 149 setReservedSlot(ERROR_REPORT_SLOT, PrivateValue(copy));
michael@0 150 return copy;
michael@0 151 }

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