added code execution main loop

components/interpreter/interpreter.cpp

@@ -1,21 +1,186 @@
 
 #include "interpreter.hpp"
 
+#include <cassert>
+#include <iostream>
+#include <sstream>
+#include <stdexcept>
+
+#include "opcodes.hpp"
+
 namespace Interpreter
 {
+    void Interpreter::execute (Type_Code code)
+    {
+        unsigned int segSpec = code>>30;
+        
+        switch (segSpec)
+        {
+            case 0:
+            {
+                int opcode = code>>24;
+                unsigned int arg0 = code & 0xffffff;
+                
+                std::map<int, Opcode1 *>::iterator iter = mSegment0.find (opcode);
+                
+                if (iter==mSegment0.end())
+                    abortUnknownCode (0, opcode);
+                
+                iter->second->execute (mRuntime, arg0);
+                
+                return;
+            }
+                        
+            case 1:
+            {
+                int opcode = (code>>24) & 0x3f;
+                unsigned int arg0 = (code>>16) & 0xfff;
+                unsigned int arg1 = code & 0xfff;
+                
+                std::map<int, Opcode2 *>::iterator iter = mSegment1.find (opcode);
+                
+                if (iter==mSegment1.end())
+                    abortUnknownCode (1, opcode);
+                
+                iter->second->execute (mRuntime, arg0, arg1);
+                
+                return;
+            }
+                        
+            case 2:
+            {
+                int opcode = (code>>20) & 0x3ff;
+                unsigned int arg0 = code & 0xfffff;
+                
+                std::map<int, Opcode1 *>::iterator iter = mSegment2.find (opcode);
+                
+                if (iter==mSegment2.end())
+                    abortUnknownCode (2, opcode);
+                
+                iter->second->execute (mRuntime, arg0);
+                
+                return;
+            }                    
+        }
+        
+        segSpec = code>>26;
+        
+        switch (segSpec)
+        { 
+            case 0x30:
+            {
+                int opcode = (code>>16) & 0x3ff;
+                unsigned int arg0 = code & 0xffff;
+                
+                std::map<int, Opcode1 *>::iterator iter = mSegment3.find (opcode);
+                
+                if (iter==mSegment3.end())
+                    abortUnknownCode (3, opcode);
+                
+                iter->second->execute (mRuntime, arg0);
+                
+                return;
+            }        
+        
+            case 0x31:
+            {
+                int opcode = (code>>16) & 0x3ff;
+                unsigned int arg0 = (code>>8) & 0xff;
+                unsigned int arg1 = code & 0xff;
+                
+                std::map<int, Opcode2 *>::iterator iter = mSegment4.find (opcode);
+                
+                if (iter==mSegment4.end())
+                    abortUnknownCode (4, opcode);
+                
+                iter->second->execute (mRuntime, arg0, arg1);
+                
+                return;
+            }            
+            
+            case 0x32:
+            {
+                int opcode = code & 0x3ffffff;
+                
+                std::map<int, Opcode0 *>::iterator iter = mSegment5.find (opcode);
+                
+                if (iter==mSegment5.end())
+                    abortUnknownCode (5, opcode);
+                
+                iter->second->execute (mRuntime);
+                
+                return;
+            }
+        }
+        
+        abortUnknownSegment (code);
+    }
+
+    void Interpreter::abortUnknownCode (int segment, int opcode)
+    {
+        std::ostringstream error;
+        
+        error << "unknown opcode " << opcode << " in segment " << segment;
+        
+        throw std::runtime_error (error.str());
+    }
+    
+    void Interpreter::abortUnknownSegment (Type_Code code)
+    {
+        std::ostringstream error;
+        
+        error << "opcode outside of the allocated segment range: " << code;
+        
+        throw std::runtime_error (error.str());
+    }
+            
     Interpreter::Interpreter (Context& context)
     : mRuntime (context)
     {}
     
     Interpreter::~Interpreter()
     {
+        for (std::map<int, Opcode1 *>::iterator iter (mSegment0.begin());
+            iter!=mSegment0.end(); ++iter)
+            delete iter->second;
 
+        for (std::map<int, Opcode2 *>::iterator iter (mSegment1.begin());
+            iter!=mSegment1.end(); ++iter)
+            delete iter->second;
+
+        for (std::map<int, Opcode1 *>::iterator iter (mSegment2.begin());
+            iter!=mSegment2.end(); ++iter)
+            delete iter->second;
+
+        for (std::map<int, Opcode1 *>::iterator iter (mSegment3.begin());
+            iter!=mSegment3.end(); ++iter)
+            delete iter->second;
+
+        for (std::map<int, Opcode2 *>::iterator iter (mSegment4.begin());
+            iter!=mSegment4.end(); ++iter)
+            delete iter->second;
+            
+        for (std::map<int, Opcode0 *>::iterator iter (mSegment5.begin());
+            iter!=mSegment5.end(); ++iter)
+            delete iter->second;            
     }
     
     void Interpreter::run (const Type_Code *code, int codeSize)
     {
+        assert (codeSize>=4);
+        
         mRuntime.configure (code, codeSize);
         
+        int opcodes = static_cast<int> (code[0]);
+        
+        const Type_Code *codeBlock = code + 4;
+        
+        while (mRuntime.getPC()>=0 && mRuntime.getPC()<opcodes)
+        {
+            Type_Code code = codeBlock[mRuntime.getPC()];
+            mRuntime.setPC (mRuntime.getPC()+1);
+            execute (code);
+        }
         
         mRuntime.clear();
     }

components/interpreter/interpreter.hpp

@@ -1,19 +1,37 @@
 #ifndef INTERPRETER_INTERPRETER_H_INCLUDED
 #define INTERPRETER_INTERPRETER_H_INCLUDED
 
+#include <map>
+
 #include "runtime.hpp"
 #include "types.hpp"
 
 namespace Interpreter
 {
+    class Opcode0;
+    class Opcode1;
+    class Opcode2;
+
     class Interpreter
     {
             Runtime mRuntime;
+            std::map<int, Opcode1 *> mSegment0;
+            std::map<int, Opcode2 *> mSegment1;
+            std::map<int, Opcode1 *> mSegment2;
+            std::map<int, Opcode1 *> mSegment3;
+            std::map<int, Opcode2 *> mSegment4;
+            std::map<int, Opcode0 *> mSegment5;
             
             // not implemented
             Interpreter (const Interpreter&);
             Interpreter& operator= (const Interpreter&);
             
+            void execute (Type_Code code);
+            
+            void abortUnknownCode (int segment, int opcode);
+            
+            void abortUnknownSegment (Type_Code code);
+            
         public:
         
             Interpreter (Context& context);

components/interpreter/opcodes.hpp

@@ -22,7 +22,7 @@ namespace Interpreter
         
             virtual void execute (Runtime& runtime, unsigned int arg0) = 0;
             
-            virtual ~Opcode0() {}
+            virtual ~Opcode1() {}
     };
 
     /// opcode for 2 arguments
@@ -32,7 +32,7 @@ namespace Interpreter
         
             virtual void execute (Runtime& runtime, unsigned int arg1, unsigned int arg2) = 0;
             
-            virtual ~Opcode0() {}
+            virtual ~Opcode2() {}
     };
 
 }

components/interpreter/runtime.cpp

@@ -3,7 +3,12 @@
 
 namespace Interpreter
 {
-    Runtime::Runtime (Context& context) : mContext (context), mCode (0) {}
+    Runtime::Runtime (Context& context) : mContext (context), mCode (0), mPC (0) {}
+    
+    int Runtime::getPC() const
+    {
+        return mPC;
+    }
     
     void Runtime::configure (const Interpreter::Type_Code *code, int codeSize)
     {    
@@ -11,6 +16,7 @@ namespace Interpreter
         
         mCode = code;
         mCodeSize = codeSize;
+        mPC = 0;
     }
 
     void Runtime::clear()
@@ -18,5 +24,10 @@ namespace Interpreter
         mCode = 0;
         mCodeSize = 0;
     }
+    
+    void Runtime::setPC (int PC)
+    {
+        mPC = PC;
+    }    
 }
 

components/interpreter/runtime.hpp

@@ -12,19 +12,26 @@ namespace Interpreter
     class Runtime
     {
             Context& mContext;
-            const Interpreter::Type_Code *mCode;
+            const Type_Code *mCode;
             int mCodeSize;
+            int mPC;
             
         public:
         
             Runtime (Context& context);
         
+            int getPC() const;
+            ///< return program counter.
+        
             void configure (const Interpreter::Type_Code *code, int codeSize);
             ///< \a context and \a code must exist as least until either configure, clear or
             /// the destructor is called. \a codeSize is given in 32-bit words.
             
             void clear();
             
+            void setPC (int PC);
+            ///< set program counter.
+    
     };
 }