chunk.c

#include <stdlib.h>
#include "chunk.h"
#include "memory.h"

void initChunk(Chunk* chunk) {
    chunk->count = 0;
    chunk->capacity = 0;
    chunk->code = NULL;
    chunk->lines = NULL;
    initValueArray(&chunk->constants);
}

/*
    The dynamic array starts off completely empty.  We don’t even allocate 
    a raw array yet. To append  a byte to the end of the chunk, we use a new function.
*/
void writeChunk(Chunk* chunk, uint8_t byte, int line) {
    if (chunk->capacity < chunk->count + 1) {
        int oldCapacity = chunk->capacity;
        chunk->capacity = GROW_CAPACITY(oldCapacity);
        chunk->code = GROW_ARRAY(uint8_t, chunk->code, oldCapacity, chunk->capacity);
        chunk->lines = GROW_ARRAY(int, chunk->lines, oldCapacity, chunk->capacity);        
    }
    chunk->code[chunk->count] = byte;
    chunk->lines[chunk->count] = line;
    ++chunk->count;
}

void freeChunk(Chunk* chunk) {
    FREE_ARRAY(uint8_t, chunk->code, chunk->capacity);
    FREE_ARRAY(int, chunk->lines, chunk->capacity);
    freeValueArray(&chunk->constants);
    initChunk(chunk);
}

int addConstant(Chunk* chunk, Value value) {
    writeValueArray(&chunk->constants, value);
    return chunk->constants.count - 1; // return the index where the constant was appedned so we can locate it later
}