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pl_vm.h
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pl_vm.h
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#ifndef __PL_VM_H__
#define __PL_VM_H__
int* vm_stack;
int vm_stack_top;
int stack_alloc_boundary;
int ptr;
int return_addr;
int static_link;
int dynamic_link;
/*
| arguments ready to move | <- this will move to the top of stack when calling a procedure
|___________________________|
| alloc_boundary | <- stack_alloc_boundary| stores the address of previous boundary,used to move arguments to the top
|___________________________|
| values........ | <- local values here
|___________________________|
| return_address | <- return_addr| ptr will be assign as this value when return
|___________________________|
| dynamic_link_address | <- dynamic_link| stores the address of previous dynamic_link
|___________________________|
| static_link_address | <- static_link| stores the address of previous static_link,used in value searching
|___________________________|
*/
void opr_nop()
{
// useless
return;
}
void opr_lit()
{
vm_stack[++vm_stack_top]=exec_code[ptr].opnum;
return;
}
void opr_opr()
{
switch(exec_code[ptr].opnum)
{
case calc_ret:
ptr=vm_stack[return_addr];
dynamic_link=vm_stack[dynamic_link];
return_addr=dynamic_link+1;
static_link=dynamic_link-1;
stack_alloc_boundary=vm_stack[stack_alloc_boundary];
vm_stack_top=stack_alloc_boundary;
break;
case calc_nega: vm_stack[vm_stack_top]=-vm_stack[vm_stack_top];break;
case calc_plus: vm_stack[vm_stack_top-1]+=vm_stack[vm_stack_top];--vm_stack_top;break;
case calc_minus: vm_stack[vm_stack_top-1]-=vm_stack[vm_stack_top];--vm_stack_top;break;
case calc_mult: vm_stack[vm_stack_top-1]*=vm_stack[vm_stack_top];--vm_stack_top;break;
case calc_div: vm_stack[vm_stack_top-1]/=vm_stack[vm_stack_top];--vm_stack_top;break;
case calc_odd: vm_stack[vm_stack_top]&=1;break;
case calc_eq: vm_stack[vm_stack_top-1]=(vm_stack[vm_stack_top-1]==vm_stack[vm_stack_top]);--vm_stack_top;break;
case calc_neq: vm_stack[vm_stack_top-1]=(vm_stack[vm_stack_top-1]!=vm_stack[vm_stack_top]);--vm_stack_top;break;
case calc_les: vm_stack[vm_stack_top-1]=(vm_stack[vm_stack_top-1]<vm_stack[vm_stack_top]); --vm_stack_top;break;
case calc_leq: vm_stack[vm_stack_top-1]=(vm_stack[vm_stack_top-1]<=vm_stack[vm_stack_top]);--vm_stack_top;break;
case calc_grt: vm_stack[vm_stack_top-1]=(vm_stack[vm_stack_top-1]>vm_stack[vm_stack_top]); --vm_stack_top;break;
case calc_geq: vm_stack[vm_stack_top-1]=(vm_stack[vm_stack_top-1]>=vm_stack[vm_stack_top]);--vm_stack_top;break;
}
return;
}
void opr_lod()
{
int stc_lnk=static_link;
int level=exec_code[ptr].level;
for(int i=0;i<level;++i)
stc_lnk=vm_stack[stc_lnk];
stc_lnk+=3+exec_code[ptr].opnum;
vm_stack[++vm_stack_top]=vm_stack[stc_lnk];
return;
}
void opr_sto()
{
int stc_lnk=static_link;
int level=exec_code[ptr].level;
for(int i=0;i<level;++i)
stc_lnk=vm_stack[stc_lnk];
stc_lnk+=3+exec_code[ptr].opnum;
vm_stack[stc_lnk]=vm_stack[vm_stack_top--];
return;
}
void opr_cal()
{
// move arguments to the top of stack
// after int,this space is the value space
for(int i=vm_stack_top;i>stack_alloc_boundary;--i)
vm_stack[i+2+vm_stack_top-stack_alloc_boundary]=vm_stack[i];
int stc_lnk=static_link;
int level=exec_code[ptr].level;
for(int i=0;i<level;++i)
stc_lnk=vm_stack[stc_lnk];
vm_stack[vm_stack_top]=stc_lnk;
static_link=vm_stack_top++;
vm_stack[vm_stack_top]=dynamic_link;
dynamic_link=vm_stack_top++;
vm_stack[vm_stack_top]=ptr;
return_addr=vm_stack_top++;
ptr=exec_code[ptr].opnum-1;
return;
}
void opr_int()
{
vm_stack_top+=exec_code[ptr].opnum+1;
vm_stack[vm_stack_top]=stack_alloc_boundary;
stack_alloc_boundary=vm_stack_top;
return;
}
void opr_jmp()
{
ptr=exec_code[ptr].opnum-1;
return;
}
void opr_jpc()
{
if(!vm_stack[vm_stack_top--])
ptr=exec_code[ptr].opnum-1;
return;
}
void opr_red()
{
int stc_lnk=static_link;
int level=exec_code[ptr].level;
for(int i=0;i<level;++i)
stc_lnk=vm_stack[stc_lnk];
stc_lnk+=3+exec_code[ptr].opnum;
std::cin>>vm_stack[stc_lnk];
return;
}
void opr_wrt()
{
std::cout<<vm_stack[vm_stack_top--]<<'\n';
return;
}
void debug()
{
printf("debug--------------------------------\n");
printf("0x%.8x %s 0x%.8x 0x%.8x\n",ptr,opcode_name[exec_code[ptr].opcode],exec_code[ptr].level,exec_code[ptr].opnum);
for(int i=vm_stack_top;i>vm_stack_top-4 && i>=0;--i)
printf("0x%.8x 0x%.8x (%d)\n",i,vm_stack[i],vm_stack[i]);
printf("-------------------------------------\n");
printf("press enter to continue...\n");
std::string temp;
std::getline(std::cin,temp);
return;
}
void (*func_ptr[])()={&opr_nop,&opr_lit,&opr_opr,&opr_lod,&opr_sto,&opr_cal,&opr_int,&opr_jmp,&opr_jpc,&opr_red,&opr_wrt};
void vm_init()
{
vm_stack[0]=0;// static link
vm_stack[1]=1;// dynamic link
vm_stack[2]=0x7fffffff;// return address
vm_stack_top=2;
static_link=0;
dynamic_link=1;
return_addr=2;
ptr=0;
stack_alloc_boundary=0;
return;
}
void vm_run()
{
vm_stack=new int[8192];
vm_init();
int size=exec_code.size();
for(;ptr<size;++ptr)
func_ptr[exec_code[ptr].opcode]();
delete []vm_stack;
return;
}
void vm_debug()
{
vm_stack=new int[8192];
vm_init();
int size=exec_code.size();
for(;ptr<size;++ptr)
{
debug();
func_ptr[exec_code[ptr].opcode]();
}
delete []vm_stack;
return;
}
#endif