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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/ModInstaller.cpp
+16 -13
View File
@@ -1,4 +1,4 @@
/* Copyright (C) 2018 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
@@ -61,19 +61,22 @@ CModInstaller::ModInstallationResult CModInstaller::Install(
return FAIL_ON_MOD_LOAD;
// Extract the name of the mod
ScriptInterface scriptInterface("Engine", "ModInstaller", scriptRuntime);
JSContext* cx = scriptInterface.GetContext();
JS::RootedValue json_val(cx);
if (!scriptInterface.ParseJSON(modinfo.GetAsString(), &json_val))
return FAIL_ON_PARSE_JSON;
JS::RootedObject json_obj(cx, json_val.toObjectOrNull());
JS::RootedValue name_val(cx);
if (!JS_GetProperty(cx, json_obj, "name", &name_val))
return FAIL_ON_EXTRACT_NAME;
CStr modName;
ScriptInterface::FromJSVal(cx, name_val, modName);
if (modName.empty())
return FAIL_ON_EXTRACT_NAME;
{
ScriptInterface scriptInterface("Engine", "ModInstaller", scriptRuntime);
ScriptInterface::Request rq(scriptInterface);
JS::RootedValue json_val(rq.cx);
if (!scriptInterface.ParseJSON(modinfo.GetAsString(), &json_val))
return FAIL_ON_PARSE_JSON;
JS::RootedObject json_obj(rq.cx, json_val.toObjectOrNull());
JS::RootedValue name_val(rq.cx);
if (!JS_GetProperty(rq.cx, json_obj, "name", &name_val))
return FAIL_ON_EXTRACT_NAME;
ScriptInterface::FromJSVal(rq, name_val, modName);
if (modName.empty())
return FAIL_ON_EXTRACT_NAME;
}
const OsPath modDir = m_ModsDir / modName;
const OsPath modPath = modDir / (modName + ".zip");