CppTools: Auto-include pre-compiled headers

So far the pre-compiled headers were processed (thus defines from those
headers were visible), but the actual includes for the documents were
not added, which is necessary for lookup/completion.

Note that this will be only done if pre-compiled headers are not ignored
(Options > C++ > Code Model > [] Ignore pre-compiled headers).

Change-Id: I54a8e6b00597af164d958e3e9f2a1075ea187788
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>

src/plugins/cpptools/cppmodelmanager_test.cpp

@@ -37,6 +37,8 @@
 #include <coreplugin/testdatadir.h>
 #include <projectexplorer/projectexplorer.h>
 #include <projectexplorer/session.h>
+
+#include <cplusplus/LookupContext.h>
 #include <utils/hostosinfo.h>
 
 #include <QDebug>
@@ -873,7 +875,7 @@ void CppToolsPlugin::test_modelmanager_defines_per_project()
     }
 }
 
-void CppToolsPlugin::test_modelmanager_defines_per_project_pch()
+void CppToolsPlugin::test_modelmanager_precompiled_headers()
 {
     ModelManagerTestHelper helper;
 
@@ -922,14 +924,16 @@ void CppToolsPlugin::test_modelmanager_defines_per_project_pch()
 
     struct Data {
         QString firstDeclarationName;
+        QString firstClassInPchFile;
         QString fileName;
     } d[] = {
-        { _("one"), main1File },
-        { _("two"), main2File }
+        { _("one"), _("ClassInPch1"), main1File },
+        { _("two"), _("ClassInPch2"), main2File }
     };
     const int size = sizeof(d) / sizeof(d[0]);
     for (int i = 0; i < size; ++i) {
         const QString firstDeclarationName = d[i].firstDeclarationName;
+        const QByteArray firstClassInPchFile = d[i].firstClassInPchFile.toUtf8();
         const QString fileName = d[i].fileName;
 
         Core::IEditor *editor = Core::EditorManager::openEditor(fileName);
@@ -943,11 +947,22 @@ void CppToolsPlugin::test_modelmanager_defines_per_project_pch()
         while (sup->lastSemanticInfoDocument().isNull())
             QCoreApplication::processEvents();
 
-        sup->snapshotUpdater()->setUsePrecompiledHeaders(true);
-        sup->snapshotUpdater()->update(mm->workingCopy());
+        const QSharedPointer<SnapshotUpdater> updater = sup->snapshotUpdater();
+        updater->setUsePrecompiledHeaders(true);
+        updater->update(mm->workingCopy());
 
-        Document::Ptr doc = mm->document(fileName);
-        QCOMPARE(nameOfFirstDeclaration(doc), firstDeclarationName);
+        // Check if defines from pch are considered
+        Document::Ptr document = mm->document(fileName);
+        QCOMPARE(nameOfFirstDeclaration(document), firstDeclarationName);
+
+        // Check if declarations from pch are considered
+        CPlusPlus::LookupContext context(document, updater->snapshot());
+        const CPlusPlus::Identifier *identifier
+            = document->control()->identifier(firstClassInPchFile.data());
+        const QList<CPlusPlus::LookupItem> results = context.lookup(identifier,
+                                                                    document->globalNamespace());
+        QVERIFY(!results.isEmpty());
+        QVERIFY(results.first().declaration()->type()->asClassType());
     }
 }
 

src/plugins/cpptools/cppsnapshotupdater.cpp

@@ -177,7 +177,8 @@ void SnapshotUpdater::update(CppModelManager::WorkingCopy workingCopy)
         }
         if (!m_editorDefines.isEmpty())
             sourceProcessor.run(editorDefinesFileName);
-        sourceProcessor.run(m_fileInEditor);
+        sourceProcessor.run(m_fileInEditor, m_usePrecompiledHeaders ? m_precompiledHeaders
+                                                                    : QStringList());
 
         m_snapshot = sourceProcessor.snapshot();
         Snapshot newSnapshot = m_snapshot.simplified(document());

src/plugins/cpptools/cppsourceprocessor.cpp

@@ -148,9 +148,10 @@ void CppSourceProcessor::addFrameworkPath(const ProjectPart::HeaderPath &framewo
 void CppSourceProcessor::setTodo(const QStringList &files)
 { m_todo = QSet<QString>::fromList(files); }
 
-void CppSourceProcessor::run(const QString &fileName)
+void CppSourceProcessor::run(const QString &fileName,
+                             const QStringList &initialIncludes)
 {
-    sourceNeeded(0, fileName, IncludeGlobal);
+    sourceNeeded(0, fileName, IncludeGlobal, initialIncludes);
 }
 
 void CppSourceProcessor::removeFromCache(const QString &fileName)
@@ -377,7 +378,8 @@ void CppSourceProcessor::stopSkippingBlocks(unsigned utf16charsOffset)
         m_currentDoc->stopSkippingBlocks(utf16charsOffset);
 }
 
-void CppSourceProcessor::sourceNeeded(unsigned line, const QString &fileName, IncludeType type)
+void CppSourceProcessor::sourceNeeded(unsigned line, const QString &fileName, IncludeType type,
+                                      const QStringList &initialIncludes)
 {
     if (fileName.isEmpty())
         return;
@@ -417,6 +419,11 @@ void CppSourceProcessor::sourceNeeded(unsigned line, const QString &fileName, In
     Document::Ptr document = Document::create(absoluteFileName);
     document->setRevision(m_revision);
     document->setEditorRevision(editorRevision);
+    foreach (const QString &include, initialIncludes) {
+        m_included.insert(include);
+        Document::Include inc(include, include, 0, IncludeLocal);
+        document->addIncludeFile(inc);
+    }
     const QFileInfo info(absoluteFileName);
     if (info.exists())
         document->setLastModified(info.lastModified());

src/plugins/cpptools/cppsourceprocessor.h

@@ -43,7 +43,7 @@ public:
     void setHeaderPaths(const ProjectPart::HeaderPaths &headerPaths);
     void setTodo(const QStringList &files);
 
-    void run(const QString &fileName);
+    void run(const QString &fileName, const QStringList &initialIncludes = QStringList());
     void removeFromCache(const QString &fileName);
     void resetEnvironment();
 
@@ -80,7 +80,8 @@ private:
     void markAsIncludeGuard(const QByteArray &macroName) QTC_OVERRIDE;
     void startSkippingBlocks(unsigned utf16charsOffset) QTC_OVERRIDE;
     void stopSkippingBlocks(unsigned utf16charsOffset) QTC_OVERRIDE;
-    void sourceNeeded(unsigned line, const QString &fileName, IncludeType type) QTC_OVERRIDE;
+    void sourceNeeded(unsigned line, const QString &fileName, IncludeType type,
+                      const QStringList &initialIncludes) QTC_OVERRIDE;
 
 private:
     CPlusPlus::Snapshot m_snapshot;

src/plugins/cpptools/cpptoolsplugin.h

@@ -146,8 +146,8 @@ private slots:
     void test_modelmanager_gc_if_last_cppeditor_closed();
     void test_modelmanager_dont_gc_opened_files();
     void test_modelmanager_defines_per_project();
-    void test_modelmanager_defines_per_project_pch();
     void test_modelmanager_defines_per_editor();
+    void test_modelmanager_precompiled_headers();
 
     void test_cpplocatorfilters_CppLocatorFilter();
     void test_cpplocatorfilters_CppLocatorFilter_data();