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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/ps/Game.cpp
+8 -10
View File
@@ -191,10 +191,9 @@ bool CGame::StartVisualReplay(const OsPath& replayPath)
std::getline(*m_ReplayStream, line);
const ScriptInterface& scriptInterface = m_Simulation2->GetScriptInterface();
JSContext* cx = scriptInterface.GetContext();
JSAutoRequest rq(cx);
ScriptInterface::Request rq(scriptInterface);
JS::RootedValue attribs(cx);
JS::RootedValue attribs(rq.cx);
scriptInterface.ParseJSON(line, &attribs);
StartGame(&attribs, "");
@@ -209,8 +208,7 @@ bool CGame::StartVisualReplay(const OsPath& replayPath)
void CGame::RegisterInit(const JS::HandleValue attribs, const std::string& savedState)
{
const ScriptInterface& scriptInterface = m_Simulation2->GetScriptInterface();
JSContext* cx = scriptInterface.GetContext();
JSAutoRequest rq(cx);
ScriptInterface::Request rq(scriptInterface);
m_InitialSavedState = savedState;
m_IsSavedGame = !savedState.empty();
@@ -240,7 +238,7 @@ void CGame::RegisterInit(const JS::HandleValue attribs, const std::string& saved
{
// Load random map attributes
std::wstring scriptFile;
JS::RootedValue settings(cx);
JS::RootedValue settings(rq.cx);
scriptInterface.GetProperty(attribs, "script", scriptFile);
scriptInterface.GetProperty(attribs, "settings", &settings);
@@ -250,7 +248,7 @@ void CGame::RegisterInit(const JS::HandleValue attribs, const std::string& saved
else
{
std::wstring mapFile;
JS::RootedValue settings(cx);
JS::RootedValue settings(rq.cx);
scriptInterface.GetProperty(attribs, "map", mapFile);
scriptInterface.GetProperty(attribs, "settings", &settings);
@@ -325,9 +323,9 @@ PSRETURN CGame::ReallyStartGame()
if (g_GUI && g_GUI->GetPageCount())
{
shared_ptr<ScriptInterface> scriptInterface = g_GUI->GetActiveGUI()->GetScriptInterface();
JSContext* cx = scriptInterface->GetContext();
JSAutoRequest rq(cx);
JS::RootedValue global(cx, scriptInterface->GetGlobalObject());
ScriptInterface::Request rq(scriptInterface);
JS::RootedValue global(rq.cx, scriptInterface->GetGlobalObject());
if (scriptInterface->HasProperty(global, "reallyStartGame"))
scriptInterface->CallFunctionVoid(global, "reallyStartGame");
}