debug.c

//
// Created by kroot on 15/7/19.
//

#include <stdio.h>

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

void disassembleChunk(Chunk* chunk, const char* name) {
    printf("== %s ==\n", name);

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

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

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;
}

static int invokeInstruction(const char* name, Chunk* chunk, int offset) {
    uint8_t nameConstant = chunk->code[offset + 1];
    uint8_t argCount = chunk->code[offset + 2];
    printf("%-16s (%d args) %4d '", name, argCount, nameConstant);
    printValue(chunk->constants.values[nameConstant]);
    printf("'\n");
    return offset + 3;
}

static int byteInstruction(const char* name, Chunk* chunk, int offset) {
    uint8_t slot = chunk->code[offset + 1];
    printf("%-16s %4d\n", name, slot);
    return offset + 2;
}

static int jumpInstruction(const char* name, int sign, Chunk* chunk, int offset) {
    uint16_t jump = (uint16_t)((chunk->code[offset + 1] << 8) | chunk->code[offset + 2]);
    printf("%-16s %4d -> %d\n", name, offset, offset + 3 + sign * jump);
    return offset + 3;
}

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]);
    }

    uint8_t instruction = chunk->code[offset];
    switch (instruction) {
        case OP_CONSTANT: return constantInstruction("OP_CONSTANT", chunk, offset);
        case OP_NIL: return simpleInstruction("OP_NIL", offset);
        case OP_TRUE: return simpleInstruction("OP_TRUE", offset);
        case OP_FALSE: return simpleInstruction("OP_FALSE", offset);
        case OP_POP: return simpleInstruction("OP_POP", offset);
        case OP_DEFINE_GLOBAL: return constantInstruction("OP_DEFINE_GLOBAL", chunk, offset);
        case OP_GET_LOCAL: return byteInstruction("OP_GET_LOCAL", chunk, offset);
        case OP_SET_LOCAL: return byteInstruction("OP_SET_LOCAL", chunk, offset);
        case OP_GET_GLOBAL: return constantInstruction("OP_GET_GLOBAL", chunk, offset);
        case OP_SET_GLOBAL: return constantInstruction("OP_SET_GLOBAL", chunk, offset);
        case OP_GET_UPVALUE: return byteInstruction("OP_GET_UPVALUE", chunk, offset);
        case OP_SET_UPVALUE: return byteInstruction("OP_SET_UPVALUE", chunk, offset);
        case OP_CLOSE_UPVALUE: return simpleInstruction("OP_CLOSE_UPVALUE", offset);
        case OP_GET_PROPERTY: return constantInstruction("OP_GET_PROPERTY", chunk, offset);
        case OP_SET_PROPERTY: return constantInstruction("OP_SET_PROPERTY", chunk, offset);
        case OP_GET_SUPER: return constantInstruction("OP_GET_SUPER", chunk, offset);
        case OP_EQUAL: return simpleInstruction("OP_EQUAL", offset);
        case OP_GREATER: return simpleInstruction("OP_GREATER", offset);
        case OP_LESS: return simpleInstruction("OP_LESS", 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_NOT: return simpleInstruction("OP_NOT", offset);
        case OP_NEGATE: return simpleInstruction("OP_NEGATE", offset);
        case OP_PRINT: return simpleInstruction("OP_PRINT", offset);
        case OP_JUMP: return jumpInstruction("OP_JUMP", 1, chunk, offset);
        case OP_JUMP_IF_FALSE: return jumpInstruction("OP_JUMP_IF_FALSE", 1, chunk, offset);
        case OP_LOOP: return jumpInstruction("OP_LOOP", -1, chunk, offset);
        case OP_CALL: return byteInstruction("OP_CALL", chunk, offset);
        case OP_INVOKE: return invokeInstruction("OP_INVOKE", chunk, offset);
        case OP_SUPER_INVOKE: return invokeInstruction("OP_SUPER_INVOKE", chunk, offset);
        case OP_CLOSURE: {
            offset++;
            uint8_t constant = chunk->code[offset++];
            printf("%-16s %4d ", "OP_CLOSURE", constant);
            printValue(chunk->constants.values[constant]);
            printf("\n");
            ObjFunction* function = AS_FUNCTION(chunk->constants.values[constant]);
            for (int j = 0; j < function->upvalueCount; ++j) {
                int isLocal = chunk->code[offset++];
                int index = chunk->code[offset++];
                printf("%04d      |                      %s %d\n", offset - 2, isLocal ? "local" : "upvalue", index);
            }
            return offset;
        }
        case OP_RETURN: return simpleInstruction("OP_RETURN", offset);
        case OP_CLASS: return constantInstruction("OP_CLASS", chunk, offset);
        case OP_INHERIT: return simpleInstruction("OP_INHERIT", offset);
        case OP_METHOD: return constantInstruction("OP_METHOD", chunk, offset);
        default:printf("Unknown opcode %d\n", instruction);
            return offset + 1;
    }
}