Debugger: Add an option to show simple values as text annotations

Change-Id: I726d8559d7e28abd776ce483d5f670be5af09412
Reviewed-by: André Hartmann <aha_1980@gmx.de>
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/debugger/commonoptionspage.cpp

@@ -83,6 +83,9 @@ public:
         auto checkBoxUseToolTipsInMainEditor = new QCheckBox(behaviorBox);
         checkBoxUseToolTipsInMainEditor->setText(tr("Use tooltips in main editor while debugging"));
 
+        auto checkBoxUseAnnotationsInMainEditor = new QCheckBox(behaviorBox);
+        checkBoxUseAnnotationsInMainEditor->setText(tr("Use annotations in main editor while debugging"));
+
         QString t = tr("Stopping and stepping in the debugger "
                        "will automatically open views associated with the current location.") + '\n';
         auto checkBoxCloseSourceBuffersOnExit = new QCheckBox(behaviorBox);
@@ -146,13 +149,14 @@ public:
 
         auto gridLayout = new QGridLayout(behaviorBox);
         gridLayout->addWidget(checkBoxUseAlternatingRowColors, 0, 0, 1, 1);
-        gridLayout->addWidget(checkBoxUseToolTipsInMainEditor, 1, 0, 1, 1);
-        gridLayout->addWidget(checkBoxCloseSourceBuffersOnExit, 2, 0, 1, 1);
-        gridLayout->addWidget(checkBoxCloseMemoryBuffersOnExit, 3, 0, 1, 1);
-        gridLayout->addWidget(checkBoxBringToForegroundOnInterrrupt, 4, 0, 1, 1);
-        gridLayout->addWidget(checkBoxBreakpointsFullPath, 5, 0, 1, 1);
-        gridLayout->addWidget(checkBoxWarnOnReleaseBuilds, 6, 0, 1, 1);
-        gridLayout->addLayout(horizontalLayout, 7, 0, 1, 2);
+        gridLayout->addWidget(checkBoxUseAnnotationsInMainEditor, 1, 0, 1, 1);
+        gridLayout->addWidget(checkBoxUseToolTipsInMainEditor, 2, 0, 1, 1);
+        gridLayout->addWidget(checkBoxCloseSourceBuffersOnExit, 3, 0, 1, 1);
+        gridLayout->addWidget(checkBoxCloseMemoryBuffersOnExit, 4, 0, 1, 1);
+        gridLayout->addWidget(checkBoxBringToForegroundOnInterrrupt, 5, 0, 1, 1);
+        gridLayout->addWidget(checkBoxBreakpointsFullPath, 6, 0, 1, 1);
+        gridLayout->addWidget(checkBoxWarnOnReleaseBuilds, 7, 0, 1, 1);
+        gridLayout->addLayout(horizontalLayout, 8, 0, 1, 2);
 
         gridLayout->addWidget(checkBoxFontSizeFollowsEditor, 0, 1, 1, 1);
         gridLayout->addWidget(checkBoxSwitchModeOnExit, 1, 1, 1, 1);
@@ -167,6 +171,8 @@ public:
 
         m_group.insert(action(UseAlternatingRowColors),
                        checkBoxUseAlternatingRowColors);
+        m_group.insert(action(UseAnnotationsInMainEditor),
+                       checkBoxUseAnnotationsInMainEditor);
         m_group.insert(action(UseToolTipsInMainEditor),
                        checkBoxUseToolTipsInMainEditor);
         m_group.insert(action(CloseSourceBuffersOnExit),

src/plugins/debugger/debuggeractions.cpp

@@ -497,6 +497,15 @@ DebuggerSettings::DebuggerSettings()
     item->setDefaultValue(false);
     insertItem(IntelFlavor, item);
 
+    item = new SavedAction;
+    item->setSettingsKey(debugModeGroup, "UseAnnotations");
+    item->setText(tr("Use annotations in main editor when debugging"));
+    item->setToolTip(tr("<p>Checking this will show simple variable values "
+        "as annotations in the main editor during debugging."));
+    item->setCheckable(true);
+    item->setDefaultValue(true);
+    insertItem(UseAnnotationsInMainEditor, item);
+
     item = new SavedAction;
     item->setSettingsKey(debugModeGroup, "UseToolTips");
     item->setText(tr("Use tooltips in main editor when debugging"));

src/plugins/debugger/debuggeractions.h

@@ -98,6 +98,7 @@ enum DebuggerActionCode
     ShowThreadNames,
 
     UseToolTipsInMainEditor,
+    UseAnnotationsInMainEditor,
     UseToolTipsInLocalsView,
     UseToolTipsInBreakpointsView,
     UseToolTipsInStackView,

src/plugins/debugger/debuggerengine.cpp

@@ -1113,6 +1113,7 @@ void DebuggerEngine::gotoLocation(const Location &loc)
     }
 
     d->m_breakHandler.setLocation(loc);
+    d->m_watchHandler.setLocation(loc);
 }
 
 void DebuggerEngine::gotoCurrentLocation()

src/plugins/debugger/debuggerinternalconstants.h

@@ -68,6 +68,7 @@ const char TASK_CATEGORY_DEBUGGER_RUNTIME[]   = "DebugRuntime";
 
 const char TEXT_MARK_CATEGORY_BREAKPOINT[]    = "Debugger.Mark.Breakpoint";
 const char TEXT_MARK_CATEGORY_LOCATION[]      = "Debugger.Mark.Location";
+const char TEXT_MARK_CATEGORY_VALUE[]         = "Debugger.Mark.Value";
 
 const char OPENED_BY_DEBUGGER[]               = "OpenedByDebugger";
 const char OPENED_WITH_DISASSEMBLY[]          = "DisassemblerView";

src/plugins/debugger/sourceutils.cpp

@@ -31,14 +31,19 @@
 #include "watchdata.h"
 #include "watchutils.h"
 
-#include <texteditor/texteditor.h>
-#include <texteditor/textdocument.h>
+#include <coreplugin/editormanager/ieditor.h>
+
+#include <cplusplus/CppDocument.h>
+#include <cplusplus/ExpressionUnderCursor.h>
+#include <cplusplus/LookupItem.h>
+#include <cplusplus/Overview.h>
+
 #include <cpptools/abstracteditorsupport.h>
 #include <cpptools/cppprojectfile.h>
 #include <cpptools/cppmodelmanager.h>
-#include <cplusplus/CppDocument.h>
-#include <cplusplus/ExpressionUnderCursor.h>
-#include <cplusplus/Overview.h>
+
+#include <texteditor/texteditor.h>
+#include <texteditor/textdocument.h>
 
 #include <utils/qtcassert.h>
 
@@ -54,6 +59,7 @@ enum { debug = 0 };
 using namespace CppTools;
 using namespace CPlusPlus;
 using namespace TextEditor;
+using namespace Utils;
 
 namespace CPlusPlus {
 
@@ -343,5 +349,95 @@ ContextData getLocationContext(TextDocument *document, int lineNumber)
     return data;
 }
 
+//
+// Annotations
+//
+class DebuggerValueMark : public TextEditor::TextMark
+{
+public:
+    DebuggerValueMark(const FilePath &fileName, int lineNumber, const QString &value)
+        : TextMark(fileName, lineNumber, Constants::TEXT_MARK_CATEGORY_VALUE)
+    {
+        setPriority(TextEditor::TextMark::HighPriority);
+        setToolTipProvider([] { return QString(); });
+        setLineAnnotation(value);
+    }
+};
+
+static QList<DebuggerValueMark *> marks;
+
+// Stolen from CPlusPlus::Document::functionAt(...)
+static int firstRelevantLine(const Document::Ptr document, int line, int column)
+{
+    QTC_ASSERT(line > 0 && column > 0, return 0);
+    CPlusPlus::Symbol *symbol = document->lastVisibleSymbolAt(line, column);
+    if (!symbol)
+        return 0;
+
+    // Find the enclosing function scope (which might be several levels up,
+    // or we might be standing on it)
+    Scope *scope = symbol->asScope();
+    if (!scope)
+        scope = symbol->enclosingScope();
+
+    while (scope && !scope->isFunction() )
+        scope = scope->enclosingScope();
+
+    if (!scope)
+        return 0;
+
+    return scope->line();
+}
+
+static void setValueAnnotationsHelper(BaseTextEditor *textEditor,
+                                      const Location &loc,
+                                      QMap<QString, QString> values)
+{
+    TextEditorWidget *widget = textEditor->editorWidget();
+    TextDocument *textDocument = widget->textDocument();
+    const FilePath filePath = loc.fileName();
+    const Snapshot snapshot = CppModelManager::instance()->snapshot();
+    const Document::Ptr cppDocument = snapshot.document(filePath.toString());
+    if (!cppDocument) // For non-C++ documents.
+        return;
+
+    const int firstLine = firstRelevantLine(cppDocument, loc.lineNumber(), 1);
+    if (firstLine < 1)
+        return;
+
+    CPlusPlus::ExpressionUnderCursor expressionUnderCursor(cppDocument->languageFeatures());
+    QTextCursor tc = widget->textCursor();
+    for (int lineNumber = loc.lineNumber(); lineNumber >= firstLine; --lineNumber) {
+        const QTextBlock block = textDocument->document()->findBlockByNumber(lineNumber - 1);
+        tc.setPosition(block.position());
+        for (; !tc.atBlockEnd(); tc.movePosition(QTextCursor::NextCharacter)) {
+            const QString expression = expressionUnderCursor(tc);
+            if (expression.isEmpty())
+                continue;
+            const QString value = values.take(expression); // Show value one only once.
+            if (value.isEmpty())
+                continue;
+            const QString annotation = QString("%1: %2").arg(expression, value);
+            marks.append(new DebuggerValueMark(filePath, lineNumber, annotation));
+        }
+    }
+}
+
+void setValueAnnotations(const Location &loc, const QMap<QString, QString> &values)
+{
+    qDeleteAll(marks);
+    marks.clear();
+    if (values.isEmpty())
+        return;
+
+    const QList<Core::IEditor *> editors = Core::EditorManager::visibleEditors();
+    for (Core::IEditor *editor : editors) {
+        if (auto textEditor = qobject_cast<BaseTextEditor *>(editor)) {
+            if (textEditor->textDocument()->filePath() == loc.fileName())
+                setValueAnnotationsHelper(textEditor, loc, values);
+        }
+    }
+}
+
 } // namespace Internal
 } // namespace Debugger

src/plugins/debugger/sourceutils.h

@@ -25,6 +25,7 @@
 
 #pragma once
 
+#include <QMap>
 #include <QString>
 
 namespace TextEditor {
@@ -38,6 +39,7 @@ namespace Debugger {
 namespace Internal {
 
 class ContextData;
+class Location;
 
 // Editor tooltip support
 QString cppExpressionAt(TextEditor::TextEditorWidget *editorWidget, int pos,
@@ -54,5 +56,7 @@ QStringList getUninitializedVariables(const CPlusPlus::Snapshot &snapshot,
 
 ContextData getLocationContext(TextEditor::TextDocument *document, int lineNumber);
 
+void setValueAnnotations(const Location &loc, const QMap<QString, QString> &values);
+
 } // namespace Internal
 } // namespace Debugger

src/plugins/debugger/watchdata.cpp

@@ -520,6 +520,7 @@ QString WatchItem::toToolTip() const
         formatToolTipRow(str, tr("Static Object Size"), tr("%n bytes", nullptr, size));
     formatToolTipRow(str, tr("Internal ID"), internalName());
     formatToolTipRow(str, tr("Creation Time in ms"), QString::number(int(time * 1000)));
+    formatToolTipRow(str, tr("Source"), sourceExpression());
     str << "</table></body></html>";
     return res;
 }
@@ -578,6 +579,31 @@ QString WatchItem::expression() const
     return name;
 }
 
+QString WatchItem::sourceExpression() const
+{
+    const WatchItem *p = parent();
+    if (!p)
+        return {}; // Root
+
+    const WatchItem *pp = p->parent();
+    if (!pp)
+        return {}; // local
+
+    const WatchItem *ppp = pp->parent();
+    if (!ppp)
+        return name; // local.x -> 'x'
+
+    // Enforce some arbitrary, but fixed limit to avoid excessive creation
+    // of very likely unused strings which are for convenience only.
+    if (arrayIndex >= 0 && arrayIndex <= 16)
+        return QString("%1[%2]").arg(p->sourceExpression()).arg(arrayIndex);
+
+    if (p->name == '*')
+        return QString("%1->%2").arg(pp->sourceExpression(), name);
+
+    return QString("%1.%2").arg(p->sourceExpression(), name);
+}
+
 } // namespace Internal
 } // namespace Debugger
 

src/plugins/debugger/watchdata.h

@@ -51,6 +51,7 @@ public:
     bool isInspect() const;
 
     QString expression() const;
+    QString sourceExpression() const;
     QString realName() const;
     QString internalName() const;
     QString toToolTip() const;

src/plugins/debugger/watchhandler.cpp

@@ -38,6 +38,7 @@
 #include "memoryagent.h"
 #include "registerhandler.h"
 #include "simplifytype.h"
+#include "sourceutils.h"
 #include "watchdelegatewidgets.h"
 #include "watchutils.h"
 
@@ -67,6 +68,7 @@
 #include <QJsonArray>
 #include <QJsonObject>
 #include <QLabel>
+#include <QMap>
 #include <QMenu>
 #include <QMimeData>
 #include <QPainter>
@@ -473,6 +475,8 @@ public:
     QHash<QString, TypeInfo> m_reportedTypeInfo;
     QHash<QString, DisplayFormats> m_reportedTypeFormats; // Type name -> Dumper Formats
     QHash<QString, QString> m_valueCache;
+
+    Location m_location;
 };
 
 WatchModel::WatchModel(WatchHandler *handler, DebuggerEngine *engine)
@@ -518,6 +522,8 @@ WatchModel::WatchModel(WatchHandler *handler, DebuggerEngine *engine)
         m_engine, &DebuggerEngine::updateAll);
     connect(action(ShowQObjectNames), &SavedAction::valueChanged,
         m_engine, &DebuggerEngine::updateAll);
+    connect(action(UseAnnotationsInMainEditor), &SavedAction::valueChanged,
+        m_engine, &DebuggerEngine::updateAll);
 
     connect(SessionManager::instance(), &SessionManager::sessionLoaded,
             this, &loadSessionData);
@@ -2081,6 +2087,7 @@ void WatchHandler::cleanup()
     theTemporaryWatchers.clear();
     saveWatchers();
     m_model->reinitialize();
+    Internal::setValueAnnotations(m_model->m_location, {});
     emit m_model->updateFinished();
     m_model->m_separatedView->hide();
 }
@@ -2234,6 +2241,16 @@ void WatchHandler::notifyUpdateFinished()
         }
     });
 
+    QMap<QString, QString> values;
+    if (boolSetting(UseAnnotationsInMainEditor)) {
+        m_model->forAllItems([&values](WatchItem *item) {
+            const QString expr = item->sourceExpression();
+            if (!expr.isEmpty())
+                values[expr] = item->value;
+        });
+    }
+    Internal::setValueAnnotations(m_model->m_location, values);
+
     m_model->m_contentsValid = true;
     updateLocalsWindow();
     m_model->reexpandItems();
@@ -2750,6 +2767,11 @@ void WatchHandler::recordTypeInfo(const GdbMi &typeInfo)
     }
 }
 
+void WatchHandler::setLocation(const Location &loc)
+{
+    m_model->m_location = loc;
+}
+
 /////////////////////////////////////////////////////////////////////
 //
 // WatchDelegate

src/plugins/debugger/watchhandler.h

@@ -119,6 +119,8 @@ public:
     void reexpandItems();
     void recordTypeInfo(const GdbMi &typeInfo);
 
+    void setLocation(const Location &loc);
+
 private:
     DebuggerEngine * const m_engine; // Not owned
     WatchModel *m_model; // Owned.