basic/src/Code.h

#ifndef BASIC_CODE_H
#define BASIC_CODE_H

#include "Buffer.h"
#include "Error.h"
#include "Types.h"

typedef enum : u8 { VT_INT32, VT_ARRAY, VT_CONSTANT_STRING } ValueType;

typedef struct {
    ValueType type;
    u8 visitMarker;
    u8 reserved2;
    u8 reserved3;
    i32 data;
} Value;

typedef struct Allocation Allocation;

struct Allocation {
    Allocation* next;
    Value values[];
};

#define INT_VALUE(value) ((Value){.type = VT_INT32, .data = (value)})

static_assert(sizeof(Value) == 8);

typedef enum : u8 {
    ADD,
    SUB,
    MUL,
    DIV,
    PUSH_CONSTANT_STRING,
    PUSH_INT32,
    POP,
    JUMP,
    JUMP_ON_0,
    JUMP_SUB,
    RETURN_VALUE,
    READ_VARIABLE,
    READ_VARIABLE_ARRAY,
    SET_VARIABLE,
    SET_VARIABLE_ARRAY,
    PUSH_STACK_VARIABLES,
    AND,
    OR,
    NOT,
    EQUAL,
    NOT_EQUAL,
    GREATER,
    SMALLER,
    GREATER_OR_EQUAL,
    SMALLER_OR_EQUAL,
    CALL_SYSTEM,
    STOP
} Instruction;

typedef struct {
    Buffer code;
    Error error;
    Value* stack;
    Allocation* allocations;
    size_t maxStackSize;
    size_t stackIndex;
    i32 localVariableIndex;
} Code;

void codeInit(Code* code);
void codeDestroy(Code* code);
void codeReset(Code* code);

void codeRun(Code* code);
bool codeHasRunError(const Code* code);
const char* codeGetRunError(const Code* code);

void codeRunCollector(Code* code);
void codeDump(const Code* code);

#define SET_ERROR(format, ...)                                 \
    snprintf(                                                  \
        c->error.text, sizeof(c->error.text), "%zu | " format, \
        c->code.readIndex __VA_OPT__(, ) __VA_ARGS__)

#endif