debug.c

#include <stdio.h>

#include "debug.h"
#include "value.h"


void disassembleChunk(Chunk* chunk, const char* name) {
    printf("== %s ==\n", name);
    printf("Offset | Line Num | OpCode | ConstantValueOffset | Constant Value \n");

    for (int offset = 0; offset < chunk->count;) {
        offset = disassembleInstruction(chunk, offset);
    }
}


static int constantInstruction(const char* name, Chunk* chunk, int offset) {
    uint8_t constant = chunk->code[offset + 1];
    printf("%-16s %4d '", name, constant);
    printValue(chunk->constants.values[constant]);
    printf("'\n");
    return offset + 2; // OPCODE, Value so next instruction = offset + 2
}


static int simpleInstruction(const char* name, int offset) {
    printf("%s\n", name);
    return offset + 1;
}


int disassembleInstruction(Chunk* chunk, int offset) {
    printf("%04d ", offset);
    if (offset > 0 && chunk->lines[offset] == chunk->lines[offset - 1]) {
        printf("   | ");
    } else {
        // printf("%4d ", chunk->lines[offset]);
        printf("buff");
    }

    uint8_t instruction = chunk->code[offset];
    switch (instruction) {
        case OP_CONSTANT:
            return constantInstruction("OP_CONSTANT", chunk, offset);
        case OP_ADD:
            return simpleInstruction("OP_ADD", offset);
        case OP_SUBTRACT:
            return simpleInstruction("OP_SUBTRACT", offset);
        case OP_MULTIPLY:
            return simpleInstruction("OP_MULTIPLY", offset);
        case OP_DIVIDE:
            return simpleInstruction("OP_DIVIDE", offset);
        case OP_NEGATE:
            return simpleInstruction("OP_NEGATE", offset);
        case OP_RETURN:
            return simpleInstruction("OP_RETURN", offset);
        default:
            printf("Unknown OpCode %d\n", instruction);
            return offset + 1;
    }
}