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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/network/scripting/JSInterface_Network.cpp
+5 -7
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
@@ -155,9 +155,8 @@ JS::Value JSI_Network::PollNetworkClient(ScriptInterface::CxPrivate* pCxPrivate)
return JS::UndefinedValue();
// Convert from net client context to GUI script context
JSContext* cxNet = g_NetClient->GetScriptInterface().GetContext();
JSAutoRequest rqNet(cxNet);
JS::RootedValue pollNet(cxNet);
ScriptInterface::Request rqNet(g_NetClient->GetScriptInterface());
JS::RootedValue pollNet(rqNet.cx);
g_NetClient->GuiPoll(&pollNet);
return pCxPrivate->pScriptInterface->CloneValueFromOtherContext(g_NetClient->GetScriptInterface(), pollNet);
}
@@ -167,9 +166,8 @@ void JSI_Network::SetNetworkGameAttributes(ScriptInterface::CxPrivate* pCxPrivat
ENSURE(g_NetClient);
// TODO: This is a workaround because we need to pass a MutableHandle to a JSAPI functions somewhere (with no obvious reason).
JSContext* cx = pCxPrivate->pScriptInterface->GetContext();
JSAutoRequest rq(cx);
JS::RootedValue attribs(cx, attribs1);
ScriptInterface::Request rq(pCxPrivate);
JS::RootedValue attribs(rq.cx, attribs1);
g_NetClient->SendGameSetupMessage(&attribs, *(pCxPrivate->pScriptInterface));
}