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vm.cpp
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vm.cpp
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//
// Created by Vlad on 25-May-22.
//
#include <iostream>
#include <vector>
#include <map>
#include <stdlib.h>
#include "vm.h"
#include "instruction.h"
using namespace std;
//context
#define STACK_SIZE (8 * 1024 * 1024)
char stack[STACK_SIZE];
char * SP;
char * stackAfter;
char * IP;
unsigned int VIP;
char * BP;
#define GLOBAL_SIZE (32 * 1024 * 1024)
char globals[GLOBAL_SIZE];
int nGlobals = 0;
//helpers
void * allocGlobal(int sz)
{
void *p = globals + nGlobals;
if(nGlobals + sz > GLOBAL_SIZE)
{
cout<<"Fatal error, global variables memory full, can't allocate anymore!\n";
exit(-1);
}
nGlobals += sz;
return p;
}
void pushd(double d)
{
if(SP + sizeof(double) > stackAfter)
{
cout<<"Fatal error, stack overflow!"<<endl;
exit(-1);
}
*(double *)SP = d;
SP += sizeof (double);
}
void pusha(void * a)
{
if(SP + sizeof(void *) > stackAfter)
{
cout<<"Fatal error, stack overflow!"<<endl;
exit(-1);
}
*(void**)SP = a;
SP += sizeof (void *);
}
void pushi(int i)
{
if(SP + sizeof(int) > stackAfter)
{
cout<<"Fatal error, stack overflow!"<<endl;
exit(-1);
}
*(int *)SP = i;
SP += sizeof (int);
}
void pushc(char c)
{
if(SP + sizeof(char) > stackAfter)
{
cout<<"Fatal error, stack overflow!"<<endl;
exit(-1);
}
*(char *)SP = c;
SP += sizeof (char);
}
double popd()
{
SP -= sizeof (double);
if (SP < stack)
{
cout<<"Fatal error, popping from empty stack!"<<endl;
exit(-1);
}
return *(double *) SP;
}
void * popa()
{
SP -= sizeof (void *);
if (SP < stack)
{
cout<<"Fatal error, popping from empty stack!"<<endl;
exit(-1);
}
return *(void **) SP;
}
int popi()
{
SP -= sizeof (int);
if (SP < stack)
{
cout<<"Fatal error, popping from empty stack!"<<endl;
exit(-1);
}
return *(int *) SP;
}
char popc()
{
SP -= sizeof (char);
if (SP < stack)
{
cout<<"Fatal error, popping from empty stack!"<<endl;
exit(-1);
}
return *(char *) SP;
}
void add_sp(int n)
{
SP += n;
if (SP > stackAfter)
{
cout<<"Fatal error, stack overflow (DROP)!"<<endl;
exit(-1);
}
}
void sub_sp(int n)
{
SP -= n;
if (SP < stack)
{
cout<<"Fatal error, popping from empty stack (DROP)!"<<endl;
exit(-1);
}
}
void f()
{
cout<<"Vand Golf 4\n";
return;
}
void put_i()
{
cout<<"PUT I:\t";
int i = popi();
cout<<i<<"\n";
}
map <uint64_t, uint64_t> funcs;
//todo somehow remove global variables
int run(vector<Instr> & bytecode)
{
//temp variables
//int i1, i2;
//double d1, d2;
//char * addr;
//init context
SP = stack;
VIP = 0;
stackAfter = stack + STACK_SIZE;
funcs[0x30000] = (uint64_t)put_i;
//VM main loop
while(true)
{
cout << "[VM] " << to_hex_string(VIP) << "\t";
switch(bytecode[VIP].opcode)
{
case ADD_I:
{
int i1, i2;
i1 = popi();
i2 = popi();
cout << "ADD_I\t" << i1 << "+" << i2 << " -> " << (i1 + i2) << "\n";
pushi(i1 + i2);
VIP++;
}
break;
case ADD_D:
{
double d1, d2;
d1 = popd();
d2 = popd();
cout << "ADD_D\t" << d1 << "+" << d2 << " -> " << (d1 + d2) << "\n";
pushd(d1 + d2);
VIP++;
}
break;
case ADD_C:
{
char c1, c2;
c1 = popc();
c2 = popc();
cout << "ADD_C\t" << c1 << "+" << c2 << " -> " << (c1 + c2) << "\n";
pushc(c1 + c2);
VIP++;
}
break;
case AND_A:
{
void * a1;
void * a2;
a1 = popa();
a2 = popa();
cout << "AND_A\t" << a1 << "-" << a2 << " -> " << (a1 && a2) << "\n";
pushi(a1 && a2);
VIP++;
}
break;
case AND_C:
{
char c1, c2;
c1 = popc();
c2 = popc();
cout << "AND_C\t" << c1 << "-" << c2 << " -> " << (c1 && c2) << "\n";
pushi(c1 && c2);
VIP++;
}
break;
case AND_D:
{
double d1, d2;
d1 = popd();
d2 = popd();
cout << "AND_D\t" << d1 << "-" << d2 << " -> " << (d1 && d2) << "\n";
pushi(d1 && d2);
VIP++;
}
break;
case AND_I:
{
int i1, i2;
i1 = popi();
i2 = popi();
cout << "AND_I\t" << i1 << "-" << i2 << " -> " << (i1 && i2) << "\n";
pushi(i1 && i2);
VIP++;
}
break;
case CALL:
{
int callAddr = bytecode[VIP].args[0].i;
int retAddr = VIP + 1;
cout<<"CALL\t"<<callAddr<<"\n";
pushi(retAddr);
VIP = callAddr;
}
break;
case CALLEXT:
{
cout<<"CALLEXT\t";
uint64_t func_addr = reinterpret_cast<uint64_t>(bytecode[VIP].args[0].addr);
void (*fun_ptr)() = reinterpret_cast<void (*)()>(funcs[func_addr]);
(*fun_ptr)();
VIP++;
}
break;
case CAST_C_D:
{
cout<<"CAST char to double\n";
char c = popc();
double d = (double)c;
pushd(d);
VIP++;
}
break;
case CAST_C_I:
{
cout<<"CAST char to int\n";
char c = popc();
int i = (int)c;
pushi(i);
VIP++;
}
break;
case CAST_D_C:
{
cout<<"CAST double to char\n";
double d = popd();
char c = (char)d;
pushc(c);
VIP++;
}
break;
case CAST_D_I:
{
cout<<"CAST double to int\n";
double d = popd();
int i = (int)d;
pushi(i);
VIP++;
}
break;
case CAST_I_C:
{
cout<<"CAST int to char\n";
int i = popi();
char c = (char)i;
pushc(c);
VIP++;
}
break;
case CAST_I_D:
{
cout<<"CAST int to double\n";
int i = popi();
double d = (double)i;
pushd(d);
VIP++;
}
break;
case DIV_I:
{
int i1, i2;
i2 = popi();
i1 = popi();
cout << "DIV_I\t" << i1 << "/" << i2 << " -> " << (i1 / i2) << "\n";
pushi(i1 / i2);
VIP++;
}
break;
case DIV_D:
{
double d1, d2;
d2 = popd();
d1 = popd();
cout << "DIV_D\t" << d1 << "/" << d2 << " -> " << (d1 / d2) << "\n";
pushd(d1 / d2);
VIP++;
}
break;
case DIV_C:
{
char c1, c2;
c2 = popc();
c1 = popc();
cout << "DIV_C\t" << c1 << "/" << c2 << " -> " << (c1 / c2) << "\n";
pushc(c1 / c2);
VIP++;
}
break;
case DROP:
{
int n = bytecode[VIP].args[0].i;
cout<<"DROP "<<n<<"\n";
sub_sp(n);
VIP++;
}
break;
case ENTER:
{
int n = bytecode[VIP].args[0].i;
cout<<"ENTER "<<n<<"\n";
pusha(BP);
BP = SP;
add_sp(n);
VIP++;
}
break;
case EQ_I:
{
int i1, i2;
i1 = popi();
i2 = popi();
cout << "EQ_I\t" << i1 << "-" << i2 << " -> " << (i1 == i2) << "\n";
pushi(i1 == i2);
VIP++;
}
break;
case EQ_D:
{
double d1, d2;
d1 = popd();
d2 = popd();
cout << "EQ_D\t" << d1 << "-" << d2 << " -> " << (d1 == d2) << "\n";
pushi(d1 == d2);
VIP++;
}
break;
case EQ_C:
{
char c1, c2;
c1 = popc();
c2 = popc();
cout << "EQ_C\t" << c1 << "-" << c2 << " -> " << (c1 == c2) << "\n";
pushi(c1 == c2);
VIP++;
}
break;
case EQ_A:
{
void * a1;
void * a2;
a1 = popa();
a2 = popa();
cout << "EQ_A\t" << a1 << "-" << a2 << " -> " << (a1 == a2) << "\n";
pushi(a1 == a2);
VIP++;
}
break;
case GREATER_I:
{
int i1, i2;
i1 = popi();
i2 = popi();
cout << "GREATER_I\t" << i1 << "-" << i2 << " -> " << (i1 > i2) << "\n";
pushi(i1 > i2);
VIP++;
}
break;
case GREATER_D:
{
double d1, d2;
d1 = popd();
d2 = popd();
cout << "GREATER_D\t" << d1 << "-" << d2 << " -> " << (d1 > d2) << "\n";
pushi(d1 > d2);
VIP++;
}
break;
case GREATER_C:
{
char c1, c2;
c1 = popc();
c2 = popc();
cout << "GREATEREQ_C\t" << c1 << "-" << c2 << " -> " << (c1 > c2) << "\n";
pushi(c1 > c2);
VIP++;
}
break;
case GREATEREQ_I:
{
int i1, i2;
i1 = popi();
i2 = popi();
cout << "GREATEREQ_I\t" << i1 << "-" << i2 << " -> " << (i1 >= i2) << "\n";
pushi(i1 >= i2);
VIP++;
}
break;
case GREATEREQ_D:
{
double d1, d2;
d1 = popd();
d2 = popd();
cout << "GREATEREQ_D\t" << d1 << "-" << d2 << " -> " << (d1 >= d2) << "\n";
pushi(d1 >= d2);
VIP++;
}
break;
case GREATEREQ_C:
{
char c1, c2;
c1 = popc();
c2 = popc();
cout << "GREATEREQ_C\t" << c1 << "-" << c2 << " -> " << (c1 >= c2) << "\n";
pushi(c1 >= c2);
VIP++;
}
break;
case HALT:
{
cout<<"HALT\n";
return 0;
}
break;
case INSERT:
{
int i1 = bytecode[VIP].args[0].i; // iDst
int i2 = bytecode[VIP].args[1].i; // nBytes
cout<<"INSERT\t"<<i1<<", "<<i2<<"\n";
if(SP + i2 > stackAfter)
{
cout<<"Fatal error, stack overflow at insert\n";
exit(-1);
}
memmove(SP- i1 + i2,SP - i1,i1); //make room
memmove(SP - i1,SP + i2,i2); //dup
SP += i2;
VIP++;
}
break;
case JF_A:
{
int i = bytecode[VIP].args[0].i;
cout<<"JF_A "<<i<<"\n";
void * a = popa();
if (!a)
{
VIP = i;
}
else
{
VIP++;
}
}
break;
case JF_C:
{
int i = bytecode[VIP].args[0].i;
cout<<"JF_C "<<i<<"\n";
char c = popc();
if (!c)
{
VIP = i;
}
else
{
VIP++;
}
}
break;
case JF_D:
{
int i = bytecode[VIP].args[0].i;
cout<<"JF_D "<<i<<"\n";
double d = popd();
if (!d)
{
VIP = i;
}
else
{
VIP++;
}
}
break;
case JF_I:
{
int i = bytecode[VIP].args[0].i;
cout<<"JF_I "<<i<<"\n";
char i2 = popi();
if (!i2)
{
VIP = i;
}
else
{
VIP++;
}
}
break;
case JMP:
{
int i = bytecode[VIP].args[0].i;
cout<<"JMP "<<i<<"\n";
VIP = i;
}
break;
case JT_A:
{
int i = bytecode[VIP].args[0].i;
cout<<"JF_A "<<i<<"\n";
void * a = popa();
if (a)
{
VIP = i;
}
else
{
VIP++;
}
}
break;
case JT_C:
{
int i = bytecode[VIP].args[0].i;
cout<<"JF_C "<<i<<"\n";
char c = popc();
if (c)
{
VIP = i;
}
else
{
VIP++;
}
}
break;
case JT_D:
{
int i = bytecode[VIP].args[0].i;
cout<<"JF_D "<<i<<"\n";
double d = popd();
if (d)
{
VIP = i;
}
else
{
VIP++;
}
}
break;
case JT_I:
{
int i = bytecode[VIP].args[0].i;
cout<<"JF_I "<<i<<"\n";
char i2 = popi();
if (i2)
{
VIP = i;
}
else
{
VIP++;
}
}
break;
case LESS_I:
{
int i1, i2;
i1 = popi();
i2 = popi();
cout << "LESS_I\t" << i1 << "-" << i2 << " -> " << (i1 < i2) << "\n";
pushi(i1 < i2);
VIP++;
}
break;
case LESS_D:
{
double d1, d2;
d1 = popd();
d2 = popd();
cout << "LESS_D\t" << d1 << "-" << d2 << " -> " << (d1 < d2) << "\n";
pushi(d1 < d2);
VIP++;
}
break;
case LESS_C:
{
char c1, c2;
c1 = popc();
c2 = popc();
cout << "GREATEREQ_C\t" << c1 << "-" << c2 << " -> " << (c1 < c2) << "\n";
pushi(c1 < c2);
VIP++;
}
break;
case LESSEQ_I:
{
int i1, i2;
i1 = popi();
i2 = popi();
cout << "LESSEQ_I\t" << i1 << "-" << i2 << " -> " << (i1 <= i2) << "\n";
pushi(i1 <= i2);
VIP++;
}
break;
case LESSEQ_D:
{
double d1, d2;
d1 = popd();
d2 = popd();
cout << "LESSEQ_D\t" << d1 << "-" << d2 << " -> " << (d1 <= d2) << "\n";
pushi(d1 <= d2);
VIP++;
}
break;
case LESSEQ_C:
{
char c1, c2;
c1 = popc();
c2 = popc();
cout << "GREATEREQ_C\t" << c1 << "-" << c2 << " -> " << (c1 <= c2) << "\n";
pushi(c1 <= c2);
VIP++;
}
break;
case MUL_I:
{
int i1, i2;
i1 = popi();
i2 = popi();
cout << "MUL_I\t" << i1 << "*" << i2 << " -> " << (i1 * i2) << "\n";
pushi(i1 * i2);
VIP++;
}
break;
case MUL_D:
{
double d1, d2;
d1 = popd();
d2 = popd();
cout << "MUL_D\t" << d1 << "*" << d2 << " -> " << (d1 * d2) << "\n";
pushd(d1 * d2);
VIP++;
}
break;
case MUL_C:
{
char c1, c2;
c1 = popc();
c2 = popc();
cout << "MUL_C\t" << c1 << "*" << c2 << " -> " << (c1 * c2) << "\n";
pushc(c1 * c2);
VIP++;
}
break;
case NEG_C:
{
char c1 = popc();
char c2 = -c1;
cout<<"NEG_C\t"<<c1<<" -> "<<c2<<"\n";
pushc(c2);
VIP++;
}
break;
case NEG_D:
{
double d1 = popd();
double d2 = -d1;
cout<<"NEG_D\t"<<d1<<" -> "<<d2<<"\n";
pushd(d2);
VIP++;
}
break;
case NEG_I:
{
int i1 = popc();
int i2 = -i1;
cout<<"NEG_I\t"<<i1<<" -> "<<i2<<"\n";
pushi(i2);
VIP++;
}
break;
case NOP:
{
cout<<"NOP\n";
VIP++;
}
break;
case NOT_C:
{
char c1 = popc();
int c2 = !c1;
cout<<"NOT_C\t"<<c1<<" -> "<<c2<<"\n";
pushi(c2);
VIP++;
}
break;
case NOT_D:
{
double d1 = popd();
int d2 = !d1;
cout<<"NOT_D\t"<<d1<<" -> "<<d2<<"\n";
pushi(d2);
VIP++;
}
break;
case NOT_I:
{
int i1 = popc();
int i2 = !i1;
cout<<"NEG_I\t"<<i1<<" -> "<<i2<<"\n";
pushi(i2);
VIP++;
}
break;
case NOT_A:
{
void *a1 = popa();
int a2 = !a1;
cout<<"NEG_A\t"<<a1<<" -> "<<a2<<"\n";
pushi(a2);
VIP++;
}
break;
case NOTEQ_I:
{
int i1, i2;
i1 = popi();
i2 = popi();
cout << "NOTEQ_I\t" << i1 << "-" << i2 << " -> " << (i1 != i2) << "\n";
pushi(i1 != i2);
VIP++;
}
break;
case NOTEQ_D:
{
double d1, d2;
d1 = popd();
d2 = popd();
cout << "EQ_D\t" << d1 << "-" << d2 << " -> " << (d1 != d2) << "\n";
pushi(d1 != d2);
VIP++;
}
break;
case NOTEQ_C:
{
char c1, c2;
c1 = popc();
c2 = popc();
cout << "NOTEQ_C\t" << c1 << "-" << c2 << " -> " << (c1 != c2) << "\n";
pushi(c1 != c2);
VIP++;
}
break;
case NOTEQ_A:
{
void * a1;
void * a2;
a1 = popa();
a2 = popa();
cout << "NOTEQ_A\t" << a1 << "-" << a2 << " -> " << (a1 != a2) << "\n";
pushi(a1 != a2);
VIP++;
}
break;
case OFFSET:
{
int offset = bytecode[VIP].args[0].i;
void * a = popa();
int64_t a_temp = (int64_t)a;
a_temp += offset;
a = (void *) a_temp;
cout << "OFFSET\t" << a << " + " << offset << " -> " << (to_hex_string((uint64_t)a)) << "\n";
pusha(a);
VIP++;
}
break;
case OR_A:
{
void * a1;
void * a2;
a1 = popa();
a2 = popa();
cout << "OR_A\t" << a1 << "-" << a2 << " -> " << (a1 || a2) << "\n";
pushi(a1 || a2);
VIP++;
}
break;
case OR_C:
{
char c1, c2;
c1 = popc();
c2 = popc();
cout << "OR_C\t" << c1 << "-" << c2 << " -> " << (c1 || c2) << "\n";
pushi(c1 || c2);
VIP++;
}
break;
case OR_D:
{
double d1, d2;
d1 = popd();
d2 = popd();
cout << "OR_D\t" << d1 << "-" << d2 << " -> " << (d1 || d2) << "\n";
pushi(d1 || d2);
VIP++;
}
break;
case OR_I:
{
int i1, i2;
i1 = popi();
i2 = popi();
cout << "AND_I\t" << i1 << "-" << i2 << " -> " << (i1 || i2) << "\n";
pushi(i1 || i2);
VIP++;
}
break;
case PUSHFPADDR:
{
int offset = bytecode[VIP].args[0].i;
cout << "PUSHFPADDR\t" << to_hex_string(reinterpret_cast<uint64_t>(BP)) << " - " << offset << " -> " << (BP + offset) << "\n";
pusha(BP + offset);
VIP++;
}
break;
case PUSHCT_A:
{
void * a = bytecode[VIP].args[0].addr;
cout<<"PUSHCT_A\t"<<to_hex_string((uint64_t)a)<<"\n";
pusha(a);
VIP++;
}
break;
case PUSHCT_C:
{
char c = bytecode[VIP].args[0].i & 0xFF;
cout<<"PUSHCT_C\t"<<c<<"\n";
pushc(c);
VIP++;
}
break;
case PUSHCT_I:
{
int i = bytecode[VIP].args[0].i;
cout<<"PUSHCT_I\t"<<i<<"\n";
pushi(i);
VIP++;
}
break;
case PUSHCT_D:
{
double d = bytecode[VIP].args[0].d;
cout<<"PUSHCT_D\t"<<d<<"\n";
pushd(d);
VIP++;
}
break;