chunk.c

#include <stdlib.h>

#include "chunk.h"
#include "memory.h"
#include "vm.h"

void init_chunk(Chunk *chunk) {
    chunk->code  = NULL;
    chunk->lines = NULL;
    chunk->len   = 0;
    chunk->cap   = 0;
    init_value_array(&chunk->constants);
}

void write_chunk(Chunk *chunk, uint8_t byte, int line) {
    if (chunk->cap < chunk->len + 1) {
        int old_cap  = chunk->cap;
        chunk->cap   = GROW_CAPACITY(old_cap);
        chunk->code  = GROW_ARRAY(uint8_t, chunk->code, old_cap, chunk->cap);
        chunk->lines = GROW_ARRAY(int, chunk->lines, old_cap, chunk->cap);
    }

    chunk->code[chunk->len] = byte;
    // TODO this is a waste of memory, use run-length encoding to store line info
    chunk->lines[chunk->len] = line;
    chunk->len++;
}

void free_chunk(Chunk *chunk) {
    FREE_ARRAY(uint8_t, chunk->code, chunk->cap);
    FREE_ARRAY(int, chunk->lines, chunk->cap);
    free_value_array(&chunk->constants);
    init_chunk(chunk);
}

int add_constant(Chunk *chunk, Value value) {
    push(value);
    write_value_array(&chunk->constants, value);
    pop();
    return chunk->constants.len - 1;
}