5 files changed, 20 insertions, 6 deletions
diff --git a/qtmips_gui/mainwindow.cpp b/qtmips_gui/mainwindow.cpp
index e3ad8dd..766a28c 100644
--- a/qtmips_gui/mainwindow.cpp
+++ b/qtmips_gui/mainwindow.cpp
@@ -620,6 +620,7 @@ void MainWindow::compile_source() {
 
     int ln = 1;
     for ( QTextBlock block = doc->begin(); block.isValid(); block = block.next(), ln++) {
+        QString error;
         int pos;
         QString label = "";
         QString line = block.text();
@@ -641,7 +642,6 @@ void MainWindow::compile_source() {
         QString op = line.split(" ").at(0).toUpper();
         if (op == ".ORG") {
             bool ok;
-            QString error;
             fixmatheval::FmeExpression expression;
             fixmatheval::FmeValue value;
             ok = expression.parse(line.mid(op.size()), error);
@@ -659,7 +659,6 @@ void MainWindow::compile_source() {
             continue;
         }
         if (op == ".WORD") {
-            QString error;
             foreach (QString s, line.mid(op.size()).split(",")) {
                 s = s.simplified();
                 std::uint32_t val = 0;
@@ -677,14 +676,14 @@ void MainWindow::compile_source() {
         }
 
         std::uint32_t inst[2] = {0, 0};
-        ssize_t size = machine::Instruction::code_from_string(inst, 8, line,
+        ssize_t size = machine::Instruction::code_from_string(inst, 8, line, error,
                                                  address, &reloc, ln, true);
         if (size < 0) {
             error_line = ln;
             editor->setCursorToLine(error_line);
             QMessageBox::critical(this, "QtMips Error",
-                              tr("line %1 instruction %2 parse error.")
-                              .arg(QString::number(ln), line));
+                              tr("line %1 instruction %2 parse error - %3.")
+                              .arg(QString::number(ln), line, error));
             break;
         }
         std::uint32_t *p = inst;
diff --git a/qtmips_gui/programdock.cpp b/qtmips_gui/programdock.cpp
index c5f40d8..bcdbd23 100644
--- a/qtmips_gui/programdock.cpp
+++ b/qtmips_gui/programdock.cpp
@@ -39,6 +39,8 @@
 #include <QTableView>
 #include <QComboBox>
 #include <QHeaderView>
+#include <QMessageBox>
+
 #include "programdock.h"
 #include "programmodel.h"
 #include "programtableview.h"
@@ -103,6 +105,7 @@ ProgramDock::ProgramDock(QWidget *parent, QSettings *settings) : Super(parent) {
             program_model, SLOT(toggle_hw_break(QModelIndex)));
     connect(this, SIGNAL(stage_addr_changed(uint,std::uint32_t)),
             program_model, SLOT(update_stage_addr(uint,std::uint32_t)));
+    connect(program_model, SIGNAL(report_error(QString)), this, SLOT(report_error(QString)));
 }
 
 void ProgramDock::setup(machine::QtMipsMachine *machine) {
@@ -166,3 +169,7 @@ void ProgramDock::update_follow_position() {
     if (follow_source != FOLLOWSRC_NONE)
         emit focus_addr(follow_addr[follow_source]);
 }
+
+void ProgramDock::report_error(QString error) {
+    QMessageBox::critical(this, "QtMips Error", error);
+}
diff --git a/qtmips_gui/programdock.h b/qtmips_gui/programdock.h
index 0dec65d..50baa50 100644
--- a/qtmips_gui/programdock.h
+++ b/qtmips_gui/programdock.h
@@ -65,6 +65,7 @@ public slots:
     void execute_inst_addr(std::uint32_t addr);
     void memory_inst_addr(std::uint32_t addr);
     void writeback_inst_addr(std::uint32_t addr);
+    void report_error(QString error);
 private:
     enum FollowSource {
         FOLLOWSRC_NONE,
diff --git a/qtmips_gui/programmodel.cpp b/qtmips_gui/programmodel.cpp
index 0f3341f..b70ed34 100644
--- a/qtmips_gui/programmodel.cpp
+++ b/qtmips_gui/programmodel.cpp
@@ -256,6 +256,7 @@ bool ProgramModel::setData(const QModelIndex & index, const QVariant & value, in
     if (role == Qt::EditRole)
     {
         bool ok;
+        QString error;
         std::uint32_t address;
         std::uint32_t data;
         machine::MemoryAccess *mem;
@@ -274,8 +275,12 @@ bool ProgramModel::setData(const QModelIndex & index, const QVariant & value, in
             mem->write_word(address, data);
             break;
         case 3:
-            if (machine::Instruction::code_from_string(&data, 4, value.toString(), address) < 0)
+            if (machine::Instruction::code_from_string(&data, 4, value.toString(),
+                                                       error, address) < 0) {
+                emit report_error(tr("instruction 1 parse error - %2.").arg(error));
+
                 return false;
+            }
             mem->write_word(address, data);
             break;
         default:
diff --git a/qtmips_gui/programmodel.h b/qtmips_gui/programmodel.h
index a2eff4b..95d0e3f 100644
--- a/qtmips_gui/programmodel.h
+++ b/qtmips_gui/programmodel.h
@@ -93,6 +93,8 @@ public:
         STAGEADDR_COUNT,
     };
 
+signals:
+    void report_error(QString error);
 public slots:
     void setup(machine::QtMipsMachine *machine);
     void check_for_updates();