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core/reloader: simplify generation teardown 

The extra complexity previously masked the use after free in 6c95267.
This commit is contained in:
outfoxxed 2024-05-31 00:27:18 -07:00
parent 84bb4098ad
commit d56c07ceb3
Signed by: outfoxxed
GPG Key ID: 4C88A185FB89301E
1 changed files with 14 additions and 17 deletions
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31
src/core/generation.cpp
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@ -14,7 +14,6 @@
#include <qqmlcontext.h>
#include <qqmlengine.h>
#include <qqmlincubator.h>
#include <qtimer.h>
#include <qtmetamacros.h>
#include "iconimageprovider.hpp"
@ -47,32 +46,30 @@ EngineGeneration::EngineGeneration(const QDir& rootPath, QmlScanner scanner)
}
EngineGeneration::~EngineGeneration() {
g_generations.remove(this->engine);
delete this->engine;
if (this->engine != nullptr) {
qFatal() << this << "destroyed without calling destroy()";
}
}
void EngineGeneration::destroy() {
// Multiple generations can detect a reload at the same time.
delete this->watcher;
QObject::disconnect(this->watcher, nullptr, this, nullptr);
this->watcher->deleteLater();
this->watcher = nullptr;
// Yes all of this is actually necessary.
if (this->engine != nullptr && this->root != nullptr) {
QObject::connect(this->root, &QObject::destroyed, this, [this]() {
// The timer seems to fix *one* of the possible qml item destructor crashes.
QTimer::singleShot(0, [this]() {
// Garbage is not collected during engine destruction.
this->engine->collectGarbage();
// prevent further js execution between garbage collection and engine destruction.
this->engine->setInterrupted(true);
QObject::connect(this->engine, &QObject::destroyed, this, [this]() { delete this; });
g_generations.remove(this->engine);
// Even after all of that there's still multiple failing assertions and segfaults.
// Pray you don't hit one.
// Note: it appeats *some* of the crashes are related to values owned by the generation.
// Test by commenting the connect() above.
this->engine->deleteLater();
this->engine = nullptr;
});
// Garbage is not collected during engine destruction.
this->engine->collectGarbage();
delete this->engine;
this->engine = nullptr;
delete this;
});
this->root->deleteLater();