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Wrap JSAutoRequest and replace usage of JSContext* with the wrapper.

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JSAutoRequest is required before calling into most JSAPI methods, for GC
reasons.
Calling it is required and fragile as one must not forget.
Further, SM52 and later make manipulating JSContext* dangerous as that
can cross Compartment(Realm in SM68) barriers (and ScriptInterface now
matches a Compartment).

The solution to both problems is to avoid using JSContext* in 0 A.D.
itself. To achieve this, a Request class is introduced, and must be used
to access a JSContext* from a scriptInterface. Further, Request is
passed to other ScriptInterface functions isntead of JSContext*, making
it obvious that the caller has already called it, reducing errors and
redundant JSAutoRequest calls.
Only JSNative functions now get a naked JSContext* without protection,
but the likelihood of forgetting a request is lower since many
ScriptInterface functions now expect it.

JSContext* is directly passed to JSAPI functions only.

Part of the SM52 migration, stage: SM45 compatible

Based on a patch by: Itms
Tested By: Freagarach
Refs #4893

Differential Revision: https://code.wildfiregames.com/D3088
This was SVN commit r24176.
This commit is contained in:
wraitii
2020-11-13 13:18:22 +00:00
parent 6a029d2a84
commit ee0d204bf6
74 changed files with 1591 additions and 1812 deletions
Download Patch File Download Diff File Expand all files Collapse all files
source/graphics/scripting/JSInterface_GameView.cpp
+4 -5
View File
@@ -1,4 +1,4 @@
/* Copyright (C) 2019 Wildfire Games.
/* Copyright (C) 2020 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. is free software: you can redistribute it and/or modify
@@ -70,14 +70,13 @@ void JSI_GameView::RegisterScriptFunctions_Settings(const ScriptInterface& scrip
JS::Value JSI_GameView::GetCameraPivot(ScriptInterface::CxPrivate* pCxPrivate)
{
JSContext* cx = pCxPrivate->pScriptInterface->GetContext();
JSAutoRequest rq(cx);
ScriptInterface::Request rq(pCxPrivate);
CVector3D pivot(-1, -1, -1);
if (g_Game && g_Game->GetView())
pivot = g_Game->GetView()->GetCameraPivot();
JS::RootedValue pivotValue(cx);
ScriptInterface::CreateObject(cx, &pivotValue, "x", pivot.X, "z", pivot.Z);
JS::RootedValue pivotValue(rq.cx);
ScriptInterface::CreateObject(rq, &pivotValue, "x", pivot.X, "z", pivot.Z);
return pivotValue;
}