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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/simulation2/components/CCmpCommandQueue.cpp
+11 -17
View File
@@ -1,4 +1,4 @@
/* Copyright (C) 2017 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
@@ -51,8 +51,7 @@ public:
virtual void Serialize(ISerializer& serialize)
{
JSContext* cx = GetSimContext().GetScriptInterface().GetContext();
JSAutoRequest rq(cx);
ScriptInterface::Request rq(GetSimContext().GetScriptInterface());
serialize.NumberU32_Unbounded("num commands", (u32)m_LocalQueue.size());
for (size_t i = 0; i < m_LocalQueue.size(); ++i)
@@ -64,36 +63,32 @@ public:
virtual void Deserialize(const CParamNode& UNUSED(paramNode), IDeserializer& deserialize)
{
JSContext* cx = GetSimContext().GetScriptInterface().GetContext();
JSAutoRequest rq(cx);
ScriptInterface::Request rq(GetSimContext().GetScriptInterface());
u32 numCmds;
deserialize.NumberU32_Unbounded("num commands", numCmds);
for (size_t i = 0; i < numCmds; ++i)
{
i32 player;
JS::RootedValue data(cx);
JS::RootedValue data(rq.cx);
deserialize.NumberI32_Unbounded("player", player);
deserialize.ScriptVal("data", &data);
m_LocalQueue.emplace_back(SimulationCommand(player, cx, data));
m_LocalQueue.emplace_back(SimulationCommand(player, rq.cx, data));
}
}
virtual void PushLocalCommand(player_id_t player, JS::HandleValue cmd)
{
JSContext* cx = GetSimContext().GetScriptInterface().GetContext();
JSAutoRequest rq(cx);
m_LocalQueue.emplace_back(SimulationCommand(player, cx, cmd));
ScriptInterface::Request rq(GetSimContext().GetScriptInterface());
m_LocalQueue.emplace_back(SimulationCommand(player, rq.cx, cmd));
}
virtual void PostNetworkCommand(JS::HandleValue cmd1)
{
JSContext* cx = GetSimContext().GetScriptInterface().GetContext();
JSAutoRequest rq(cx);
ScriptInterface::Request rq(GetSimContext().GetScriptInterface());
// TODO: This is a workaround because we need to pass a MutableHandle to StringifyJSON.
JS::RootedValue cmd(cx, cmd1.get());
JS::RootedValue cmd(rq.cx, cmd1.get());
PROFILE2_EVENT("post net command");
PROFILE2_ATTR("command: %s", GetSimContext().GetScriptInterface().StringifyJSON(&cmd, false).c_str());
@@ -106,10 +101,9 @@ public:
virtual void FlushTurn(const std::vector<SimulationCommand>& commands)
{
const ScriptInterface& scriptInterface = GetSimContext().GetScriptInterface();
JSContext* cx = scriptInterface.GetContext();
JSAutoRequest rq(cx);
ScriptInterface::Request rq(scriptInterface);
JS::RootedValue global(cx, scriptInterface.GetGlobalObject());
JS::RootedValue global(rq.cx, scriptInterface.GetGlobalObject());
std::vector<SimulationCommand> localCommands;
m_LocalQueue.swap(localCommands);