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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/gui/Scripting/JSInterface_GUISize.cpp
+31 -30
View File
@@ -43,45 +43,46 @@ void JSI_GUISize::RegisterScriptClass(ScriptInterface& scriptInterface)
bool JSI_GUISize::construct(JSContext* cx, uint argc, JS::Value* vp)
{
JSAutoRequest rq(cx);
JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
ScriptInterface* pScriptInterface = ScriptInterface::GetScriptInterfaceAndCBData(cx)->pScriptInterface;
JS::RootedObject obj(cx, pScriptInterface->CreateCustomObject("GUISize"));
ScriptInterface::Request rq(*pScriptInterface);
JS::RootedObject obj(rq.cx, pScriptInterface->CreateCustomObject("GUISize"));
if (args.length() == 8)
{
JS_SetProperty(cx, obj, "left", args[0]);
JS_SetProperty(cx, obj, "top", args[1]);
JS_SetProperty(cx, obj, "right", args[2]);
JS_SetProperty(cx, obj, "bottom", args[3]);
JS_SetProperty(cx, obj, "rleft", args[4]);
JS_SetProperty(cx, obj, "rtop", args[5]);
JS_SetProperty(cx, obj, "rright", args[6]);
JS_SetProperty(cx, obj, "rbottom", args[7]);
JS_SetProperty(rq.cx, obj, "left", args[0]);
JS_SetProperty(rq.cx, obj, "top", args[1]);
JS_SetProperty(rq.cx, obj, "right", args[2]);
JS_SetProperty(rq.cx, obj, "bottom", args[3]);
JS_SetProperty(rq.cx, obj, "rleft", args[4]);
JS_SetProperty(rq.cx, obj, "rtop", args[5]);
JS_SetProperty(rq.cx, obj, "rright", args[6]);
JS_SetProperty(rq.cx, obj, "rbottom", args[7]);
}
else if (args.length() == 4)
{
JS::RootedValue zero(cx, JS::NumberValue(0));
JS_SetProperty(cx, obj, "left", args[0]);
JS_SetProperty(cx, obj, "top", args[1]);
JS_SetProperty(cx, obj, "right", args[2]);
JS_SetProperty(cx, obj, "bottom", args[3]);
JS_SetProperty(cx, obj, "rleft", zero);
JS_SetProperty(cx, obj, "rtop", zero);
JS_SetProperty(cx, obj, "rright", zero);
JS_SetProperty(cx, obj, "rbottom", zero);
JS::RootedValue zero(rq.cx, JS::NumberValue(0));
JS_SetProperty(rq.cx, obj, "left", args[0]);
JS_SetProperty(rq.cx, obj, "top", args[1]);
JS_SetProperty(rq.cx, obj, "right", args[2]);
JS_SetProperty(rq.cx, obj, "bottom", args[3]);
JS_SetProperty(rq.cx, obj, "rleft", zero);
JS_SetProperty(rq.cx, obj, "rtop", zero);
JS_SetProperty(rq.cx, obj, "rright", zero);
JS_SetProperty(rq.cx, obj, "rbottom", zero);
}
else
{
JS::RootedValue zero(cx, JS::NumberValue(0));
JS_SetProperty(cx, obj, "left", zero);
JS_SetProperty(cx, obj, "top", zero);
JS_SetProperty(cx, obj, "right", zero);
JS_SetProperty(cx, obj, "bottom", zero);
JS_SetProperty(cx, obj, "rleft", zero);
JS_SetProperty(cx, obj, "rtop", zero);
JS_SetProperty(cx, obj, "rright", zero);
JS_SetProperty(cx, obj, "rbottom", zero);
JS::RootedValue zero(rq.cx, JS::NumberValue(0));
JS_SetProperty(rq.cx, obj, "left", zero);
JS_SetProperty(rq.cx, obj, "top", zero);
JS_SetProperty(rq.cx, obj, "right", zero);
JS_SetProperty(rq.cx, obj, "bottom", zero);
JS_SetProperty(rq.cx, obj, "rleft", zero);
JS_SetProperty(rq.cx, obj, "rtop", zero);
JS_SetProperty(rq.cx, obj, "rright", zero);
JS_SetProperty(rq.cx, obj, "rbottom", zero);
}
args.rval().setObject(*obj);
@@ -99,11 +100,11 @@ CStr JSI_GUISize::ToPercentString(double pix, double per)
bool JSI_GUISize::toString(JSContext* cx, uint argc, JS::Value* vp)
{
// JSAutoRequest not needed for the calls below
JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
CStr buffer;
ScriptInterface* pScriptInterface = ScriptInterface::GetScriptInterfaceAndCBData(cx)->pScriptInterface;
ScriptInterface::Request rq(*pScriptInterface);
double val, valr;
#define SIDE(side) \
@@ -120,6 +121,6 @@ bool JSI_GUISize::toString(JSContext* cx, uint argc, JS::Value* vp)
SIDE(bottom);
#undef SIDE
ScriptInterface::ToJSVal(cx, args.rval(), buffer);
ScriptInterface::ToJSVal(rq, args.rval(), buffer);
return true;
}