forked from mirrors/0ad
wraitii
ee0d204bf6
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.
330 lines
10 KiB
C++
330 lines
10 KiB
C++
/* Copyright (C) 2019 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "precompiled.h"
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#include "scriptinterface/ScriptConversions.h"
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#include "graphics/Color.h"
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#include "maths/Fixed.h"
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#include "maths/FixedVector2D.h"
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#include "maths/FixedVector3D.h"
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#include "ps/CLogger.h"
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#include "ps/Shapes.h"
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#include "ps/utf16string.h"
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#include "simulation2/helpers/CinemaPath.h"
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#include "simulation2/helpers/Grid.h"
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#include "simulation2/system/IComponent.h"
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#include "simulation2/system/ParamNode.h"
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#define FAIL(msg) STMT(JS_ReportError(rq.cx, msg); return false)
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#define FAIL_VOID(msg) STMT(JS_ReportError(rq.cx, msg); return)
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template<> void ScriptInterface::ToJSVal<IComponent*>(const Request& rq, JS::MutableHandleValue ret, IComponent* const& val)
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{
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if (val == NULL)
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{
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ret.setNull();
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return;
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}
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// If this is a scripted component, just return the JS object directly
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JS::RootedValue instance(rq.cx, val->GetJSInstance());
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if (!instance.isNull())
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{
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ret.set(instance);
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return;
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}
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// Otherwise we need to construct a wrapper object
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// (TODO: cache wrapper objects?)
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JS::RootedObject obj(rq.cx);
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if (!val->NewJSObject(*ScriptInterface::GetScriptInterfaceAndCBData(rq.cx)->pScriptInterface, &obj))
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{
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// Report as an error, since scripts really shouldn't try to use unscriptable interfaces
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LOGERROR("IComponent does not have a scriptable interface");
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ret.setUndefined();
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return;
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}
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JS_SetPrivate(obj, static_cast<void*>(val));
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ret.setObject(*obj);
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}
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template<> void ScriptInterface::ToJSVal<CParamNode>(const Request& rq, JS::MutableHandleValue ret, CParamNode const& val)
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{
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val.ToJSVal(rq, true, ret);
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// Prevent modifications to the object, so that it's safe to share between
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// components and to reconstruct on deserialization
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if (ret.isObject())
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{
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JS::RootedObject obj(rq.cx, &ret.toObject());
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JS_DeepFreezeObject(rq.cx, obj);
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}
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}
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template<> void ScriptInterface::ToJSVal<const CParamNode*>(const Request& rq, JS::MutableHandleValue ret, const CParamNode* const& val)
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{
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if (val)
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ToJSVal(rq, ret, *val);
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else
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ret.setUndefined();
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}
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template<> bool ScriptInterface::FromJSVal<CColor>(const Request& rq, JS::HandleValue v, CColor& out)
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{
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if (!v.isObject())
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FAIL("CColor has to be an object");
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JS::RootedObject obj(rq.cx, &v.toObject());
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JS::RootedValue r(rq.cx);
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JS::RootedValue g(rq.cx);
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JS::RootedValue b(rq.cx);
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JS::RootedValue a(rq.cx);
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if (!JS_GetProperty(rq.cx, obj, "r", &r) || !FromJSVal(rq, r, out.r))
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FAIL("Failed to get property CColor.r");
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if (!JS_GetProperty(rq.cx, obj, "g", &g) || !FromJSVal(rq, g, out.g))
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FAIL("Failed to get property CColor.g");
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if (!JS_GetProperty(rq.cx, obj, "b", &b) || !FromJSVal(rq, b, out.b))
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FAIL("Failed to get property CColor.b");
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if (!JS_GetProperty(rq.cx, obj, "a", &a) || !FromJSVal(rq, a, out.a))
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FAIL("Failed to get property CColor.a");
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return true;
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}
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template<> void ScriptInterface::ToJSVal<CColor>(const Request& rq, JS::MutableHandleValue ret, CColor const& val)
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{
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CreateObject(
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rq,
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ret,
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"r", val.r,
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"g", val.g,
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"b", val.b,
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"a", val.a);
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}
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template<> bool ScriptInterface::FromJSVal<fixed>(const Request& rq, JS::HandleValue v, fixed& out)
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{
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double ret;
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if (!JS::ToNumber(rq.cx, v, &ret))
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return false;
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out = fixed::FromDouble(ret);
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// double can precisely represent the full range of fixed, so this is a non-lossy conversion
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return true;
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}
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template<> void ScriptInterface::ToJSVal<fixed>(const Request& UNUSED(rq), JS::MutableHandleValue ret, const fixed& val)
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{
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ret.set(JS::NumberValue(val.ToDouble()));
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}
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template<> bool ScriptInterface::FromJSVal<CFixedVector3D>(const Request& rq, JS::HandleValue v, CFixedVector3D& out)
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{
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if (!v.isObject())
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return false; // TODO: report type error
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JS::RootedObject obj(rq.cx, &v.toObject());
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JS::RootedValue p(rq.cx);
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if (!JS_GetProperty(rq.cx, obj, "x", &p)) return false; // TODO: report type errors
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if (!FromJSVal(rq, p, out.X)) return false;
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if (!JS_GetProperty(rq.cx, obj, "y", &p)) return false;
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if (!FromJSVal(rq, p, out.Y)) return false;
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if (!JS_GetProperty(rq.cx, obj, "z", &p)) return false;
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if (!FromJSVal(rq, p, out.Z)) return false;
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return true;
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}
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template<> void ScriptInterface::ToJSVal<CFixedVector3D>(const Request& rq, JS::MutableHandleValue ret, const CFixedVector3D& val)
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{
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ScriptInterface::CxPrivate* pCxPrivate = ScriptInterface::GetScriptInterfaceAndCBData(rq.cx);
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JS::RootedObject global(rq.cx, &pCxPrivate->pScriptInterface->GetGlobalObject().toObject());
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JS::RootedValue valueVector3D(rq.cx);
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if (!JS_GetProperty(rq.cx, global, "Vector3D", &valueVector3D))
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FAIL_VOID("Failed to get Vector3D constructor");
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JS::AutoValueArray<3> args(rq.cx);
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args[0].setNumber(val.X.ToDouble());
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args[1].setNumber(val.Y.ToDouble());
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args[2].setNumber(val.Z.ToDouble());
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if (!JS::Construct(rq.cx, valueVector3D, args, ret))
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FAIL_VOID("Failed to construct Vector3D object");
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}
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template<> bool ScriptInterface::FromJSVal<CFixedVector2D>(const Request& rq, JS::HandleValue v, CFixedVector2D& out)
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{
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if (!v.isObject())
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return false; // TODO: report type error
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JS::RootedObject obj(rq.cx, &v.toObject());
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JS::RootedValue p(rq.cx);
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if (!JS_GetProperty(rq.cx, obj, "x", &p)) return false; // TODO: report type errors
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if (!FromJSVal(rq, p, out.X)) return false;
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if (!JS_GetProperty(rq.cx, obj, "y", &p)) return false;
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if (!FromJSVal(rq, p, out.Y)) return false;
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return true;
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}
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template<> void ScriptInterface::ToJSVal<CFixedVector2D>(const Request& rq, JS::MutableHandleValue ret, const CFixedVector2D& val)
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{
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ScriptInterface::CxPrivate* pCxPrivate = ScriptInterface::GetScriptInterfaceAndCBData(rq.cx);
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JS::RootedObject global(rq.cx, &pCxPrivate->pScriptInterface->GetGlobalObject().toObject());
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JS::RootedValue valueVector2D(rq.cx);
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if (!JS_GetProperty(rq.cx, global, "Vector2D", &valueVector2D))
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FAIL_VOID("Failed to get Vector2D constructor");
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JS::AutoValueArray<2> args(rq.cx);
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args[0].setNumber(val.X.ToDouble());
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args[1].setNumber(val.Y.ToDouble());
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if (!JS::Construct(rq.cx, valueVector2D, args, ret))
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FAIL_VOID("Failed to construct Vector2D object");
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}
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template<> void ScriptInterface::ToJSVal<Grid<u8> >(const Request& rq, JS::MutableHandleValue ret, const Grid<u8>& val)
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{
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u32 length = (u32)(val.m_W * val.m_H);
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u32 nbytes = (u32)(length * sizeof(u8));
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JS::RootedObject objArr(rq.cx, JS_NewUint8Array(rq.cx, length));
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// Copy the array data and then remove the no-GC check to allow further changes to the JS data
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{
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JS::AutoCheckCannotGC nogc;
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bool sharedMemory;
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memcpy((void*)JS_GetUint8ArrayData(objArr, &sharedMemory, nogc), val.m_Data, nbytes);
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}
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JS::RootedValue data(rq.cx, JS::ObjectValue(*objArr));
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CreateObject(
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rq,
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ret,
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"width", val.m_W,
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"height", val.m_H,
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"data", data);
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}
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template<> void ScriptInterface::ToJSVal<Grid<u16> >(const Request& rq, JS::MutableHandleValue ret, const Grid<u16>& val)
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{
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u32 length = (u32)(val.m_W * val.m_H);
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u32 nbytes = (u32)(length * sizeof(u16));
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JS::RootedObject objArr(rq.cx, JS_NewUint16Array(rq.cx, length));
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// Copy the array data and then remove the no-GC check to allow further changes to the JS data
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{
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JS::AutoCheckCannotGC nogc;
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bool sharedMemory;
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memcpy((void*)JS_GetUint16ArrayData(objArr, &sharedMemory, nogc), val.m_Data, nbytes);
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}
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JS::RootedValue data(rq.cx, JS::ObjectValue(*objArr));
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CreateObject(
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rq,
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ret,
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"width", val.m_W,
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"height", val.m_H,
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"data", data);
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}
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template<> bool ScriptInterface::FromJSVal<TNSpline>(const Request& rq, JS::HandleValue v, TNSpline& out)
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{
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if (!v.isObject())
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FAIL("Argument must be an object");
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JS::RootedObject obj(rq.cx, &v.toObject());
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bool isArray;
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if (!JS_IsArrayObject(rq.cx, obj, &isArray) || !isArray)
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FAIL("Argument must be an array");
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u32 numberOfNodes = 0;
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if (!JS_GetArrayLength(rq.cx, obj, &numberOfNodes))
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FAIL("Failed to get array length");
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for (u32 i = 0; i < numberOfNodes; ++i)
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{
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JS::RootedValue node(rq.cx);
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if (!JS_GetElement(rq.cx, obj, i, &node))
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FAIL("Failed to read array element");
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fixed deltaTime;
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if (!FromJSProperty(rq, node, "deltaTime", deltaTime))
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FAIL("Failed to read Spline.deltaTime property");
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CFixedVector3D position;
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if (!FromJSProperty(rq, node, "position", position))
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FAIL("Failed to read Spline.position property");
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out.AddNode(position, CFixedVector3D(), deltaTime);
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}
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if (out.GetAllNodes().empty())
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FAIL("Spline must contain at least one node");
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return true;
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}
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template<> bool ScriptInterface::FromJSVal<CCinemaPath>(const Request& rq, JS::HandleValue v, CCinemaPath& out)
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{
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if (!v.isObject())
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FAIL("Argument must be an object");
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JS::RootedObject obj(rq.cx, &v.toObject());
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CCinemaData pathData;
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TNSpline positionSpline, targetSpline;
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if (!FromJSProperty(rq, v, "name", pathData.m_Name))
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FAIL("Failed to get CCinemaPath.name property");
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if (!FromJSProperty(rq, v, "orientation", pathData.m_Orientation))
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FAIL("Failed to get CCinemaPath.orientation property");
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if (!FromJSProperty(rq, v, "positionNodes", positionSpline))
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FAIL("Failed to get CCinemaPath.positionNodes property");
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if (pathData.m_Orientation == L"target" && !FromJSProperty(rq, v, "targetNodes", targetSpline))
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FAIL("Failed to get CCinemaPath.targetNodes property");
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// Other properties are not necessary to be defined
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if (!FromJSProperty(rq, v, "timescale", pathData.m_Timescale))
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pathData.m_Timescale = fixed::FromInt(1);
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if (!FromJSProperty(rq, v, "mode", pathData.m_Mode))
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pathData.m_Mode = L"ease_inout";
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if (!FromJSProperty(rq, v, "style", pathData.m_Style))
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pathData.m_Style = L"default";
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out = CCinemaPath(pathData, positionSpline, targetSpline);
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return true;
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}
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// define vectors
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JSVAL_VECTOR(CFixedVector2D)
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#undef FAIL
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#undef FAIL_VOID
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