Adding a header to the DisassemblyWidget to show the function prototype (#771)

* Adding a header to the DisassemblyWidget to show the function prototype

* Moving the afcf headerLabel functionality to the GraphWidget

* In middle of implementation

* In middle

* syntax highlighter added

* Implementation done.

* Fixed the changes that were not necessary.

src/widgets/DisassemblerGraphView.cpp

@@ -8,6 +8,7 @@
 #include <QShortcut>
 #include <QToolTip>
 #include <QTextDocument>
+#include <QTextEdit>
 #include <QFileDialog>
 #include <QFile>
 #include <QVBoxLayout>
@@ -19,6 +20,7 @@
 #include "utils/Configuration.h"
 #include "utils/CachedFontMetrics.h"
 #include "utils/TempConfig.h"
+#include "utils/SyntaxHighlighter.h"
 
 DisassemblerGraphView::DisassemblerGraphView(QWidget *parent)
     : GraphView(parent),
@@ -111,6 +113,12 @@ DisassemblerGraphView::DisassemblerGraphView(QWidget *parent)
     connect(&actionSyncOffset, SIGNAL(triggered(bool)), this, SLOT(toggleSync()));
     initFont();
     colorsUpdatedSlot();
+
+    header = new QTextEdit(viewport());
+    header->setFixedHeight(30);
+    header->setReadOnly(true);
+    header->setLineWrapMode(QTextEdit::NoWrap);
+    highlighter = new SyntaxHighlighter(header->document());
 }
 
 void DisassemblerGraphView::connectSeekChanged(bool disconn)
@@ -336,6 +344,44 @@ void DisassemblerGraphView::prepareGraphNode(GraphBlock &block)
     block.height = (height * charHeight) + extra;
 }
 
+void DisassemblerGraphView::prepareHeader()
+{
+    QString afcf = Core()->cmd("afcf").trimmed();
+    if (afcf.length() > 0) {
+        header->setPlainText(afcf);
+        header->show();
+        return;
+    }
+    QJsonArray func = Core()->cmdj("afij").array();
+    QJsonValue value = func.first();
+    QJsonObject obj = value.toObject();
+    QString name = obj["name"].toString().trimmed();
+    if (name.isEmpty()) {
+        header->hide();
+        return;
+    }
+    QString ret = obj["calltype"].toString().trimmed();
+    ret += (" ") + name + ("(");
+    QJsonArray args = obj["bpvars"].toArray();
+    QString argNames = QString();
+    for (QJsonValue value : args) {
+        QJsonObject obj = value.toObject();
+        QString kind = obj["kind"].toString();
+        if (kind == "arg") {
+            QString typeName = obj["type"].toString().trimmed();
+            QString argName = obj["name"].toString().trimmed();
+            if (argNames.isEmpty()) {
+                argNames += typeName + (" ") + argName;
+            } else {
+                argNames += (", ") + typeName + (" ") + argName;
+            }
+        }
+    }
+    ret += argNames + (")");
+    header->setPlainText(ret);
+    header->show();
+}
+
 void DisassemblerGraphView::initFont()
 {
     setFont(Config()->getFont());
@@ -629,14 +675,16 @@ void DisassemblerGraphView::onSeekChanged(RVA addr)
         // This is a local address! We animated to it.
         transition_dont_seek = true;
         showBlock(&blocks[db->entry], true);
+        prepareHeader();
         return;
     } else {
         refreshView();
-        DisassemblyBlock *db = blockForAddress(addr);
+        db = blockForAddress(addr);
         if (db) {
             // This is a local address! We animated to it.
             transition_dont_seek = true;
-            showBlock(&blocks[db->entry], false);
+            showBlock(&blocks[db->entry], true);
+            prepareHeader();
             return;
         }
     }

src/widgets/DisassemblerGraphView.h

@@ -13,6 +13,9 @@
 #include "utils/RichTextPainter.h"
 #include "CutterSeekableWidget.h"
 
+class QTextEdit;
+class SyntaxHighlighter;
+
 class DisassemblerGraphView : public GraphView
 {
     Q_OBJECT
@@ -123,6 +126,7 @@ public:
     void loadCurrentGraph();
     QString windowTitle;
     bool isGraphEmpty();
+    QTextEdit *header = nullptr;
 
 public slots:
     void refreshView();
@@ -168,6 +172,7 @@ private:
 
     void initFont();
     void prepareGraphNode(GraphBlock &block);
+    void prepareHeader();
     Token *getToken(Instr *instr, int x);
     RVA getAddrForMouseEvent(GraphBlock &block, QPoint *point);
     Instr *getInstrForMouseEvent(GraphBlock &block, QPoint *point);
@@ -206,6 +211,7 @@ private:
     QAction actionSyncOffset;
 
     QLabel *emptyText = nullptr;
+    SyntaxHighlighter *highlighter = nullptr;
 };
 
 #endif // DISASSEMBLERGRAPHVIEW_H

src/widgets/GraphWidget.cpp

@@ -14,16 +14,16 @@ GraphWidget::GraphWidget(MainWindow *main, QAction *action) :
     // getting the name of the class is implementation defined, and cannot be
     // used reliably across different compilers.
     //QShortcut *toggle_shortcut = new QShortcut(widgetShortcuts[typeid(this).name()], main);
-    
     QShortcut *toggle_shortcut = new QShortcut(widgetShortcuts["GraphWidget"], main);
     connect(toggle_shortcut, &QShortcut::activated, this, [ = ]() {
             toggleDockWidget(true); 
             main->updateDockActionChecked(action);
     });
 
-    connect(this, &QDockWidget::visibilityChanged, this, [](bool visibility) {
+    connect(this, &QDockWidget::visibilityChanged, this, [ = ](bool visibility) {
         if (visibility) {
             Core()->setMemoryWidgetPriority(CutterCore::MemoryWidgetType::Graph);
+            this->graphView->header->setFixedWidth(width());
         }
     });
 
@@ -33,6 +33,7 @@ GraphWidget::GraphWidget(MainWindow *main, QAction *action) :
         if (type == CutterCore::MemoryWidgetType::Graph && !emptyGraph) {
             this->raise();
             this->graphView->setFocus();
+            this->graphView->header->setFixedWidth(width());
         }
     });
 }