From 53605cd996338dafc507d4126a2a49b865b04db1 Mon Sep 17 00:00:00 2001
From: Pavel Pisa <pisa@cmp.felk.cvut.cz>
Date: Sun, 10 Feb 2019 20:41:14 +0100
Subject: Memory QTableView working for part of the memory range.

Unfortunately, QModelIndex supports only integers for rows
and columns. Even if only size to maxint is used then
Qt engine crashes. Workaround for Qt limitations is material
for followup patches.

Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
---
 qtmips_gui/memorymodel.cpp | 29 ++++++++++++++++++++++++++---
 1 file changed, 26 insertions(+), 3 deletions(-)

(limited to 'qtmips_gui/memorymodel.cpp')

diff --git a/qtmips_gui/memorymodel.cpp b/qtmips_gui/memorymodel.cpp
index 65ee586..13ae1c7 100644
--- a/qtmips_gui/memorymodel.cpp
+++ b/qtmips_gui/memorymodel.cpp
@@ -42,10 +42,12 @@ MemoryModel::MemoryModel(QObject *parent)
     index0_offset = 0;
     data_font.setStyleHint(QFont::TypeWriter);
     machine = nullptr;
+    memory_change_counter = 0;
+    cache_data_change_counter = 0;
 }
 
 int MemoryModel::rowCount(const QModelIndex & /*parent*/) const {
-   std::uint64_t rows = (0x100 + cells_per_row - 1) / cells_per_row;
+   std::uint64_t rows = (0x2000 + cells_per_row - 1) / cells_per_row;
    return rows;
 }
 
@@ -76,8 +78,7 @@ QVariant MemoryModel::data(const QModelIndex &index, int role) const {
         QString s, t;
         std::uint32_t address;
         std::uint32_t data;
-        address = index0_offset + (index.row() * cells_per_row * cellSizeBytes());
-        if (address < index0_offset)
+        if (!get_row_address(address, index.row()))
             return QString("");
         if (index.column() == 0) {
             t = QString::number(address, 16);
@@ -124,6 +125,8 @@ QVariant MemoryModel::data(const QModelIndex &index, int role) const {
 
 void MemoryModel::setup(machine::QtMipsMachine *machine) {
     this->machine = machine;
+    if (machine != nullptr)
+        connect(machine, SIGNAL(post_tick()), this, SLOT(check_for_updates()));
 }
 
 void MemoryModel::setCellsPerRow(unsigned int cells) {
@@ -135,5 +138,25 @@ void MemoryModel::setCellsPerRow(unsigned int cells) {
 void MemoryModel::set_cell_size(int index) {
     beginResetModel();
     cell_size = (enum MemoryCellSize)index;
+    index0_offset -= index0_offset % cellSizeBytes();
     endResetModel();
+    emit cell_size_changed();
+}
+
+void MemoryModel::check_for_updates() {
+    bool need_update = false;
+    if (machine == nullptr)
+        return;
+    if (machine->memory() == nullptr)
+        return;
+
+    if (memory_change_counter != machine->memory()->get_change_counter())
+        need_update = true;
+    if (machine->cache_data() != nullptr) {
+        if (cache_data_change_counter != machine->cache_data()->get_change_counter())
+            need_update = true;
+    }
+    if (!need_update)
+        return;
+    emit dataChanged(index(0, 0), index(rowCount() - 1, columnCount() - 1));
 }
-- 
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