Fetch disassembly with pdJ (Fixes #177) (#210)

* Use pdJ for DisassemblyWidget
* Attach DisassemblyLine to QTextBlock in DisassemblyWidget

src/cutter.cpp

@@ -1,5 +1,6 @@
 #include <QJsonArray>
 #include <QJsonObject>
+#include <utils/TempConfig.h>
 #include "utils/Configuration.h"
 #include "cutter.h"
 #include "sdb.h"
@@ -1331,3 +1332,22 @@ void CutterCore::setNotes(const QString &notes)
     this->notes = notes;
     emit notesChanged(this->notes);
 }
+
+QList<DisassemblyLine> CutterCore::disassembleLines(RVA offset, int lines)
+{
+    QJsonArray array = cmdj(QString("pdJ ") + QString::number(lines) + QString(" @ ") + QString::number(offset)).array();
+    QList<DisassemblyLine> r;
+
+    for (QJsonValue value : array)
+    {
+        QJsonObject object = value.toObject();
+
+        DisassemblyLine line;
+        line.offset = object["offset"].toVariant().toULongLong();
+        line.text = object["text"].toString();
+
+        r << line;
+    }
+
+    return r;
+}

src/cutter.h

@@ -168,6 +168,12 @@ struct RBinPluginDescription
     QString type;
 };
 
+struct DisassemblyLine
+{
+    RVA offset;
+    QString text;
+};
+
 Q_DECLARE_METATYPE(FunctionDescription)
 Q_DECLARE_METATYPE(ImportDescription)
 Q_DECLARE_METATYPE(ExportDescription)
@@ -202,6 +208,9 @@ public:
     QString cmd(const QString &str);
     QJsonDocument cmdj(const QString &str);
     QStringList cmdList(const QString &str)     { auto l = cmd(str).split("\n"); l.removeAll(""); return l; }
+
+    QList<DisassemblyLine> disassembleLines(RVA offset, int lines);
+
     void renameFunction(QString prev_name, QString new_name);
     void delFunction(RVA addr);
     void renameFlag(QString old_name, QString new_name);

src/widgets/DisassemblyWidget.cpp

@@ -11,6 +11,19 @@
 #include <QJsonObject>
 #include <QVBoxLayout>
 #include <QRegularExpression>
+#include <QTextBlockUserData>
+
+
+class DisassemblyTextBlockUserData: public QTextBlockUserData
+{
+public:
+    DisassemblyLine line;
+
+    explicit DisassemblyTextBlockUserData(const DisassemblyLine &line)
+    {
+        this->line = line;
+    }
+};
 
 
 DisassemblyWidget::DisassemblyWidget(QWidget *parent)
@@ -126,25 +139,6 @@ QWidget* DisassemblyWidget::getTextWidget()
     return mDisasTextEdit;
 }
 
-QString DisassemblyWidget::readDisasm(const QString &cmd, bool stripLastNewline)
-{
-    TempConfig tempConfig;
-    tempConfig.set("scr.html", true)
-            .set("scr.color", true);
-
-    QString disas = Core()->cmd(cmd);
-
-    if (stripLastNewline)
-    {
-        // ugly hack to remove trailing newline
-        static const auto trimBrRegExp = QRegularExpression("<br />$");
-        disas = disas.remove(trimBrRegExp);
-    }
-
-    return disas.trimmed();
-}
-
-
 void DisassemblyWidget::refreshDisasm(RVA offset)
 {
     if (offset != RVA_INVALID)
@@ -168,11 +162,25 @@ void DisassemblyWidget::refreshDisasm(RVA offset)
     int horizontalScrollValue = mDisasTextEdit->horizontalScrollBar()->value();
     mDisasTextEdit->setLockScroll(true); // avoid flicker
     
-    QString disas = readDisasm("pd " + QString::number(maxLines) + "@" + QString::number(topOffset), true);
+    QList<DisassemblyLine> disassemblyLines;
+    {
+        TempConfig tempConfig;
+        tempConfig.set("scr.html", true)
+                .set("scr.color", true);
+        disassemblyLines = Core()->disassembleLines(topOffset, maxLines);
+    }
 
     connectCursorPositionChanged(true);
 
-    mDisasTextEdit->document()->setHtml(disas);
+    mDisasTextEdit->document()->clear();
+    QTextCursor cursor(mDisasTextEdit->document());
+    for (DisassemblyLine line : disassemblyLines)
+    {
+        cursor.insertHtml(line.text);
+        auto a = new DisassemblyTextBlockUserData(line);
+        cursor.block().setUserData(a);
+        cursor.insertBlock();
+    }
 
     // get bottomOffset from last visible line.
     // because pd N may return more than N lines, move maxLines lines down from the top
@@ -307,32 +315,14 @@ RVA DisassemblyWidget::readCurrentDisassemblyOffset()
 
 RVA DisassemblyWidget::readDisassemblyOffset(QTextCursor tc)
 {
-    // TODO: do this in a different way without parsing the disassembly text
-
-    static const QRegularExpression offsetRegExp("^0x[0-9A-Fa-f]*");
-
-    while (true)
+    QTextBlockUserData *userData = tc.block().userData();
+    if (!userData)
     {
-        tc.select(QTextCursor::LineUnderCursor);
-
-        QString line = tc.selectedText();
-
-        auto match = offsetRegExp.match(line);
-        if (match.hasMatch())
-        {
-            return match.captured(0).toULongLong(nullptr, 16);
-        }
-
-        tc.movePosition(QTextCursor::StartOfLine);
-        if (tc.atStart())
-        {
-            break;
-        }
-
-        tc.movePosition(QTextCursor::Up);
-    }
-
         return RVA_INVALID;
+    }
+
+    auto *dsUserData = static_cast<DisassemblyTextBlockUserData *>(userData);
+    return dsUserData->line.offset;
 }
 
 void DisassemblyWidget::updateCursorPosition()

src/widgets/DisassemblyWidget.h

@@ -46,7 +46,6 @@ private:
     RVA bottomOffset;
     int maxLines;
 
-    QString readDisasm(const QString &cmd, bool stripLastNewline);
     RVA readCurrentDisassemblyOffset();
     RVA readDisassemblyOffset(QTextCursor tc);
     bool eventFilter(QObject *obj, QEvent *event);