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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* Functions and types related to SavedFrame objects created by the Debugger
* API.
*/
#ifndef js_SavedFrameAPI_h
#define js_SavedFrameAPI_h
#include "jstypes.h" // JS_PUBLIC_API
#include "js/TypeDecls.h"
struct JSPrincipals;
namespace JS {
/*
* Accessors for working with SavedFrame JSObjects
*
* Each of these functions assert that if their `HandleObject savedFrame`
* argument is non-null, its JSClass is the SavedFrame class (or it is a
* cross-compartment or Xray wrapper around an object with the SavedFrame class)
* and the object is not the SavedFrame.prototype object.
*
* Each of these functions will find the first SavedFrame object in the chain
* whose underlying stack frame principals are subsumed by the given
* |principals|, and operate on that SavedFrame object. This prevents leaking
* information about privileged frames to un-privileged callers
*
* The SavedFrame in parameters do _NOT_ need to be in the same compartment as
* the cx, and the various out parameters are _NOT_ guaranteed to be in the same
* compartment as cx.
*
* You may consider or skip over self-hosted frames by passing
* `SavedFrameSelfHosted::Include` or `SavedFrameSelfHosted::Exclude`
* respectively.
*
* Additionally, it may be the case that there is no such SavedFrame object
* whose captured frame's principals are subsumed by |principals|! If the
* `HandleObject savedFrame` argument is null, or the |principals| do not
* subsume any of the chained SavedFrame object's principals,
* `SavedFrameResult::AccessDenied` is returned and a (hopefully) sane default
* value is chosen for the out param.
*
* See also `js/src/doc/SavedFrame/SavedFrame.md`.
*/
enum class SavedFrameResult { Ok, AccessDenied };
enum class SavedFrameSelfHosted { Include, Exclude };
/**
* Given a SavedFrame JSObject, get its source property. Defaults to the empty
* string.
*/
extern JS_PUBLIC_API SavedFrameResult GetSavedFrameSource(
JSContext* cx, JSPrincipals* principals, Handle<JSObject*> savedFrame,
MutableHandle<JSString*> sourcep,
SavedFrameSelfHosted selfHosted = SavedFrameSelfHosted::Include);
/**
* Given a SavedFrame JSObject, get an ID identifying its ScriptSource.
* Defaults to 0.
*/
extern JS_PUBLIC_API SavedFrameResult GetSavedFrameSourceId(
JSContext* cx, JSPrincipals* principals, Handle<JSObject*> savedFrame,
uint32_t* sourceIdp,
SavedFrameSelfHosted selfHosted = SavedFrameSelfHosted::Include);
/**
* Given a SavedFrame JSObject, get its line property. Defaults to 0.
*/
extern JS_PUBLIC_API SavedFrameResult GetSavedFrameLine(
JSContext* cx, JSPrincipals* principals, Handle<JSObject*> savedFrame,
uint32_t* linep,
SavedFrameSelfHosted selfHosted = SavedFrameSelfHosted::Include);
/**
* Given a SavedFrame JSObject, get its column property. Defaults to 0.
*/
extern JS_PUBLIC_API SavedFrameResult GetSavedFrameColumn(
JSContext* cx, JSPrincipals* principals, Handle<JSObject*> savedFrame,
uint32_t* columnp,
SavedFrameSelfHosted selfHosted = SavedFrameSelfHosted::Include);
/**
* Given a SavedFrame JSObject, get its functionDisplayName string, or nullptr
* if SpiderMonkey was unable to infer a name for the captured frame's
* function. Defaults to nullptr.
*/
extern JS_PUBLIC_API SavedFrameResult GetSavedFrameFunctionDisplayName(
JSContext* cx, JSPrincipals* principals, Handle<JSObject*> savedFrame,
MutableHandle<JSString*> namep,
SavedFrameSelfHosted selfHosted = SavedFrameSelfHosted::Include);
/**
* Given a SavedFrame JSObject, get its asyncCause string. Defaults to nullptr.
*/
extern JS_PUBLIC_API SavedFrameResult GetSavedFrameAsyncCause(
JSContext* cx, JSPrincipals* principals, Handle<JSObject*> savedFrame,
MutableHandle<JSString*> asyncCausep,
SavedFrameSelfHosted selfHosted = SavedFrameSelfHosted::Include);
/**
* Given a SavedFrame JSObject, get its asyncParent SavedFrame object or nullptr
* if there is no asyncParent. The `asyncParentp` out parameter is _NOT_
* guaranteed to be in the cx's compartment. Defaults to nullptr.
*/
extern JS_PUBLIC_API SavedFrameResult GetSavedFrameAsyncParent(
JSContext* cx, JSPrincipals* principals, Handle<JSObject*> savedFrame,
MutableHandle<JSObject*> asyncParentp,
SavedFrameSelfHosted selfHosted = SavedFrameSelfHosted::Include);
/**
* Given a SavedFrame JSObject, get its parent SavedFrame object or nullptr if
* it is the oldest frame in the stack. The `parentp` out parameter is _NOT_
* guaranteed to be in the cx's compartment. Defaults to nullptr.
*/
extern JS_PUBLIC_API SavedFrameResult GetSavedFrameParent(
JSContext* cx, JSPrincipals* principals, Handle<JSObject*> savedFrame,
MutableHandle<JSObject*> parentp,
SavedFrameSelfHosted selfHosted = SavedFrameSelfHosted::Include);
/**
* Given a SavedFrame object, convert it and its transitive parents to plain
* objects. Because SavedFrame objects store their properties on the prototype,
* they cannot be usefully stringified to JSON. Assigning their properties to
* plain objects allow those objects to be stringified and the saved frame stack
* can be encoded as a string.
*/
JS_PUBLIC_API JSObject* ConvertSavedFrameToPlainObject(
JSContext* cx, JS::HandleObject savedFrame,
JS::SavedFrameSelfHosted selfHosted);
} // namespace JS
namespace js {
/**
* Get the first SavedFrame object in this SavedFrame stack whose principals are
* subsumed by the given |principals|. If there is no such frame, return
* nullptr.
*
* Do NOT pass a non-SavedFrame object here.
*/
extern JS_PUBLIC_API JSObject* GetFirstSubsumedSavedFrame(
JSContext* cx, JSPrincipals* principals, JS::Handle<JSObject*> savedFrame,
JS::SavedFrameSelfHosted selfHosted);
} // namespace js
#endif /* js_SavedFrameAPI_h */
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