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/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
****************************************************************************/
#include "clangdocumentsuspenderresumer.h"
#include "clangsupport_global.h"
#include "clangdocumentprocessors.h"
#include "clangdocuments.h"
#include <utils/algorithm.h>
#include <algorithm>
namespace ClangBackEnd {
constexpr int DefaultHotDocumentsSize = 7;
void categorizeHotColdDocuments(int hotDocumentsSize,
const std::vector<Document> &inDocuments,
std::vector<Document> &hotDocuments,
std::vector<Document> &coldDocuments)
{
// Sort documents, most recently used/visible at top
std::vector<Document> documents = inDocuments;
std::stable_sort(documents.begin(), documents.end(), [](const Document &a, const Document &b) {
return a.visibleTimePoint() > b.visibleTimePoint();
});
// Ensure that visible documents are always hot, otherwise not all visible
// documents will be resumed.
const auto isVisible = [](const Document &document) { return document.isVisibleInEditor(); };
const int visibleDocumentsSize = Utils::count(documents, isVisible);
hotDocumentsSize = std::max(hotDocumentsSize, visibleDocumentsSize);
if (documents.size() <= uint(hotDocumentsSize)) {
hotDocuments = documents;
coldDocuments.clear();
} else {
const auto firstColdIterator = documents.begin() + hotDocumentsSize;
hotDocuments = std::vector<Document>(documents.begin(), firstColdIterator);
coldDocuments = std::vector<Document>(firstColdIterator, documents.end());
}
}
static int hotDocumentsSize()
{
static int hotDocuments = -1;
if (hotDocuments == -1) {
bool ok = false;
const int fromEnvironment = qEnvironmentVariableIntValue("QTC_CLANG_HOT_DOCUMENTS", &ok);
hotDocuments = ok && fromEnvironment >= 1 ? fromEnvironment : DefaultHotDocumentsSize;
}
return hotDocuments;
}
static SuspendResumeJobs createJobs(const Document &document, JobRequest::Type type)
{
SuspendResumeJobs jobs;
jobs.append({document, type, PreferredTranslationUnit::RecentlyParsed});
if (document.isResponsivenessIncreased())
jobs.append({document, type, PreferredTranslationUnit::PreviouslyParsed});
return jobs;
}
static bool isFineDocument(const Document &document)
{
return !document.isNull() && document.isIntact();
}
static bool isSuspendable(const Document &document)
{
return isFineDocument(document)
&& !document.isSuspended()
&& !document.isVisibleInEditor()
&& document.isParsed();
}
static bool isResumable(const Document &document)
{
return isFineDocument(document)
&& document.isSuspended()
&& document.isVisibleInEditor();
}
SuspendResumeJobs createSuspendResumeJobs(const std::vector<Document> &documents,
int customHotDocumentSize)
{
SuspendResumeJobs jobs;
std::vector<Document> hotDocuments;
std::vector<Document> coldDocuments;
const int size = (customHotDocumentSize == -1) ? hotDocumentsSize() : customHotDocumentSize;
categorizeHotColdDocuments(size, documents, hotDocuments, coldDocuments);
// Cold documents should be suspended...
const std::vector<Document> toSuspend = Utils::filtered(coldDocuments, &isSuspendable);
for (const Document &document : toSuspend)
jobs += createJobs(document, JobRequest::Type::SuspendDocument);
// ...and hot documents that were suspended should be resumed
const std::vector<Document> toResume = Utils::filtered(hotDocuments, &isResumable);
for (const Document &document : toResume)
jobs += createJobs(document, JobRequest::Type::ResumeDocument);
return jobs;
}
} // namespace ClangBackEnd
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