/**
  ******************************************************************************
  * @file           : vm.h
  * @author         : simon
  * @brief          : hand it a chunk of code—literally a Chunk—and it runs it
  * @attention      : None
  * @date           : 2023/8/17
  ******************************************************************************
  */

#ifndef CLOX__VM_H_
#define CLOX__VM_H_

#include "compiler.h"
#include "object.h"
#include "table.h"

#define FRAMES_MAX 64
#define STACK_MAX (FRAMES_MAX * UINT8_COUNT)

typedef struct {
  ObjClosure *closure;
  uint8_t *ip;
  Value *slots;//  points into the VM’s value stack
  // at the first slot that this function can use
} CallFrame;

typedef struct VM {
  CallFrame frames[FRAMES_MAX];
  int frameCount;

  Value stack[STACK_MAX];
  Value *stackTop;// 栈指针
  Table globals;
  Table strings;        //
  ObjString *initString;// 初始化方法
  ObjUpvalue *openUpvalues;

  size_t bytesAllocated;
  size_t nextGC;
  Obj *objects;// 管理分配的 heap 内存
  int grayCount;
  int grayCapacity;
  Obj **grayStack;
} VM;
typedef enum {
  INTERPRET_OK,
  INTERPRET_COMPILE_ERROR,
  INTERPRET_RUNTIME_ERROR
} InterpretResult;

extern VM vm;

void initVM();
void freeVM();
/// \brief interpret 执行指令
/// \param source 源代码
/// \return InterpretResult
InterpretResult interpret(const char *source);
void push(Value value);
Value pop();

#endif//CLOX__VM_H_