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Nasal-Interpreter
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show vm stack top's info when error occurs

This commit is contained in:
Li Haokun 2021-07-20 19:21:05 +08:00 committed by GitHub
parent 7a93f5b89b
commit 61677101e4
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 39 additions and 21 deletions
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50
nasal_vm.h
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@ -8,7 +8,7 @@ private:
nasal_val**& stack_top;// stack top
/* values of nasal_vm */
uint32_t pc; // program counter
std::stack<int> ret; // ptr stack stores address for function to return
std::stack<uint32_t> ret; // ptr stack stores address for function to return
std::stack<int> counter; // iterator stack for forindex/foreach
std::vector<double> num_table;// numbers used in process(const calculation)
std::vector<std::string> str_table;// symbols used in process
@ -132,7 +132,7 @@ void nasal_vm::clear()
}
void nasal_vm::die(std::string str)
{
printf(">> [vm] error: %s\ntrace back:\n",str.c_str());
printf(">> [vm] error at 0x%.8x: %s\ntrace back:\n",pc,str.c_str());
// add error pc into ret_stack
ret.push(pc);
// trace back will use ret_stack
@ -141,13 +141,31 @@ void nasal_vm::die(std::string str)
uint32_t point=ret.top();
ret.pop();
printf(
"\tpc 0x%.8x: %s 0x%.8x (%s line %d)\n",
"\t0x%.8x: %s 0x%.8x (%s line %d)\n",
point,
code_table[bytecode[point].op].name,
bytecode[point].num,
files[bytecode[point].fidx].c_str(),
bytecode[point].line);
}
printf("vm stack(limit 10):\n");
for(int i=0;i<10 && stack_top-i>=gc.val_stack;++i)
{
printf("\t0x%.p ",stack_top[-i]);
if(!stack_top[-i])
printf(" nullptr\n");
else
switch(stack_top[-i]->type)
{
case vm_nil: printf("nil\n");break;
case vm_num: printf("num %lf\n",stack_top[-i]->ptr.num); break;
case vm_str: printf("str at %p\n",stack_top[-i]->ptr.str); break;
case vm_func: printf("func at %p\n",stack_top[-i]->ptr.func);break;
case vm_vec: printf("vec at %p\n",stack_top[-i]->ptr.vec); break;
case vm_hash: printf("hash at %p\n",stack_top[-i]->ptr.hash);break;
default: printf("unknown\n");break;
}
}
gc.val_stack[STACK_MAX_DEPTH-1]=(nasal_val*)0xffff;
return;
}
@ -277,12 +295,11 @@ inline void nasal_vm::opr_dynpara()
inline void nasal_vm::opr_unot()
{
nasal_val* val=stack_top[0];
int type=val->type;
if(type==vm_nil)
stack_top[0]=gc.one_addr;
else if(type==vm_num)
stack_top[0]=val->ptr.num?gc.zero_addr:gc.one_addr;
else if(type==vm_str)
switch(val->type)
{
case vm_nil:stack_top[0]=gc.one_addr;break;
case vm_num:stack_top[0]=val->ptr.num?gc.zero_addr:gc.one_addr;break;
case vm_str:
{
double num=str2num(val->ptr.str->c_str());
if(std::isnan(num))
@ -290,8 +307,9 @@ inline void nasal_vm::opr_unot()
else
stack_top[0]=num?gc.zero_addr:gc.one_addr;
}
else
die("unot: incorrect value type");
break;
default:die("unot: incorrect value type");break;
}
return;
}
inline void nasal_vm::opr_usub()
@ -897,7 +915,7 @@ inline void nasal_vm::opr_ret()
}
void nasal_vm::run(std::vector<opcode>& exec)
{
uint32_t count[op_ret+1]={0};
uint64_t count[op_ret+1]={0};
void* opr_table[]=
{
&&nop, &&intg, &&intl, &&offset,
@ -929,19 +947,19 @@ void nasal_vm::run(std::vector<opcode>& exec)
imm.push_back(i.num);
}
nasal_val** canary=gc.val_stack+STACK_MAX_DEPTH-1;
auto& canary=gc.val_stack[STACK_MAX_DEPTH-1];
clock_t begin=clock();
pc=0;
goto *code[pc];
nop:
if(canary[0] && canary[0]!=(nasal_val*)0xffff)
if(canary && canary!=(nasal_val*)0xffff)
die("stack overflow");
std::cout<<">> [vm] process exited after "<<((double)(clock()-begin))/CLOCKS_PER_SEC<<"s.\n";
// debug
// for(int i=0;i<15;++i)
// {
// int maxnum=0,index=0;
// uint64_t maxnum=0,index=0;
// for(int j=0;j<op_ret+1;++j)
// if(count[j]>maxnum)
// {
@ -953,7 +971,7 @@ nop:
// }
return;
//#define exec_operand(op,num) {op();++count[num];if(!canary[0])goto *code[++pc];goto nop;}
#define exec_operand(op,num) {op();if(!canary[0])goto *code[++pc];goto nop;}
#define exec_operand(op,num) {op();if(!canary)goto *code[++pc];goto nop;}
//#define exec_opnodie(op,num) {op();++count[num];goto *code[++pc];}
#define exec_opnodie(op,num) {op();goto *code[++pc];}