my cpu design

1 files changed, 46 insertions, 0 deletions

diff --git a/ue3/mycpu/cinstruction.cpp b/ue3/mycpu/cinstruction.cpp
new file mode 100644
index 0000000..32bdd2f
--- /dev/null
+++ b/ue3/mycpu/cinstruction.cpp
@@ -0,0 +1,46 @@
+/**
+ * @module cinstruction
+ * @author Guenther Neuwirth (0626638), Manuel Mausz (0728348)
+ * @brief  TODO
+ * @date   10.05.2009
+ */
+
+#include <sstream>
+#include <stdexcept>
+#include <boost/lexical_cast.hpp>
+#include "cinstruction.h"
+#include "ccpu.h"
+
+using namespace std;
+
+const unsigned CInstruction::parseRegister(const std::string& str)
+{
+  unsigned reg;
+  if (str.length() < 2 || str[0] != 'R')
+    throw runtime_error("Invalid syntax of register");
+
+  try
+  {
+    reg = boost::lexical_cast<unsigned>(str.substr(1));
+  }
+  catch(boost::bad_lexical_cast& ex)
+  {
+    throw runtime_error("Invalid syntax of register");
+  }
+
+  return reg;
+}
+
+/*----------------------------------------------------------------------------*/
+
+inline void CInstruction::checkRegister(CCPU *cpu, unsigned regidx)
+{
+  if (regidx >= cpu->getRegisterCount())
+  {
+    stringstream sstr;
+    sstr << "Register R" << regidx << " doesn't exist (out of bound)";
+    throw runtime_error(sstr.str());
+  }
+}
+
+/* vim: set et sw=2 ts=2: */