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#pragma once
#include <vector>
#include <string>
#include <cstring>
class Simulation;
namespace pim
{
union Word
{
int Integer;
float Decimal;
Word(int integer) : Integer(integer) {}
Word(float decimal) : Decimal(decimal) {}
Word() {}
};
struct Instruction
{
int Opcode;
Word Parameter;
};
class InvalidProgramException: public std::exception
{
public:
InvalidProgramException() { }
const char * what() const throw()
{
return "Invalid program";
}
~InvalidProgramException() throw() {};
};
class UnresolvedValueException: public std::exception
{
char * error;
public:
UnresolvedValueException(std::string value) {
error = strdup(std::string("Unresolved value: " + value).c_str());
}
const char * what() const throw()
{
return error;
}
~UnresolvedValueException() throw() {};
};
class VirtualMachine
{
#define WORDSIZE 4
//#define OPDEF(name) void op##name(int parameter);
//#include "Opcodes.inl"
//#undef OPDEF
Simulation * sim;
Instruction * rom;
int romSize;
int romMask;
unsigned char * compiledRom;
int compiledRomSize;
unsigned char * ram;
int ramSize;
int ramMask;
#define CSA(argument) (*((Word*)&ram[framePointer-argument]))
#define CS() (*((Word*)&ram[callStack]))
#define PS() (*((Word*)&ram[programStack]))
#define PPROP(index, property) (*((Word*)(((char*)&sim->parts[(index)])+property)))
int programStack; //Points to the item on top of the Program Stack
int callStack; //Points to the item on top of the call stack
int framePointer; //Points to the bottom (first item) on the current frame of the call stack
//Instruction * instructions;
int programCounter;
void emit(std::string opcode);
void emit(int constant);
public:
VirtualMachine(Simulation * sim);
int OpcodeArgSize(int opcode);
void LoadProgram(std::vector<unsigned char> programData);
void Run();
void Compile();
void CallCompiled(std::string entryPoint);
void CallCompiled(int entryPoint);
void Call(std::string entryPoint);
void Call(int entryPoint);
inline void PSPush(Word word)
{
programStack -= WORDSIZE;
PS() = word;
}
inline Word PSPop()
{
Word word = PS();
programStack += WORDSIZE;
return word;
}
inline void CSPush(Word word)
{
callStack -= WORDSIZE;
CS() = word;
}
inline Word CSPop()
{
Word word = CS();
callStack += WORDSIZE;
return word;
}
};
}
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