showbc.c 10.6 KB
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#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>

#include "misc.h"
#include "mpyconfig.h"
#include "runtime.h"
#include "bc.h"

#define DECODE_UINT do { unum = *ip++; if (unum > 127) { unum = ((unum & 0x3f) << 8) | (*ip++); } } while (0)
#define DECODE_ULABEL do { unum = (ip[0] | (ip[1] << 8)); ip += 2; } while (0)
#define DECODE_SLABEL do { unum = (ip[0] | (ip[1] << 8)) - 0x8000; ip += 2; } while (0)
#define DECODE_QSTR do { qstr = *ip++; if (qstr > 127) { qstr = ((qstr & 0x3f) << 8) | (*ip++); } } while (0)

void py_show_byte_code(const byte *ip, int len) {
    const byte *ip_start = ip;
    machine_uint_t unum;
    qstr qstr;
    while (ip - ip_start < len) {
        printf("%02u ", (uint)(ip - ip_start));
        int op = *ip++;
        switch (op) {
            case PYBC_LOAD_CONST_FALSE:
                printf("LOAD_CONST_FALSE");
                break;

            case PYBC_LOAD_CONST_NONE:
                printf("LOAD_CONST_NONE");
                break;

            case PYBC_LOAD_CONST_TRUE:
                printf("LOAD_CONST_TRUE");
                break;

            case PYBC_LOAD_CONST_SMALL_INT:
                unum = (ip[0] | (ip[1] << 8) | (ip[2] << 16)) - 0x800000;
                ip += 3;
                printf("LOAD_CONST_SMALL_INT %d", (int)unum);
                break;

                /*
            case PYBC_LOAD_CONST_DEC:
                DECODE_QSTR;
                PUSH(rt_load_const_dec(qstr));
                break;

            case PYBC_LOAD_CONST_ID:
                DECODE_QSTR;
                PUSH(rt_load_const_str(qstr)); // TODO
                break;

            case PYBC_LOAD_CONST_STRING:
                DECODE_QSTR;
                PUSH(rt_load_const_str(qstr));
                break;
                */

            case PYBC_LOAD_FAST_0:
                printf("LOAD_FAST_0");
                break;

            case PYBC_LOAD_FAST_1:
                printf("LOAD_FAST_1");
                break;

            case PYBC_LOAD_FAST_2:
                printf("LOAD_FAST_2");
                break;

                /*
            case PYBC_LOAD_FAST_N:
                DECODE_UINT;
                PUSH(fastn[unum]);
                break;
                */

            case PYBC_LOAD_NAME:
                DECODE_QSTR;
                printf("LOAD_NAME %s", qstr_str(qstr));
                break;

            case PYBC_LOAD_GLOBAL:
                DECODE_QSTR;
                printf("LOAD_GLOBAL %s", qstr_str(qstr));
                break;

                /*
            case PYBC_LOAD_ATTR:
                DECODE_QSTR;
                *sp = rt_load_attr(*sp, qstr);
                break;
                */

            case PYBC_LOAD_METHOD:
                DECODE_QSTR;
                printf("LOAD_METHOD %s", qstr_str(qstr));
                break;

                /*
            case PYBC_LOAD_BUILD_CLASS:
                PUSH(rt_load_build_class());
                break;
                */

            case PYBC_STORE_FAST_0:
                printf("STORE_FAST_0");
                break;

            case PYBC_STORE_FAST_1:
                printf("STORE_FAST_1");
                break;

            case PYBC_STORE_FAST_2:
                printf("STORE_FAST_2");
                break;

                /*
            case PYBC_STORE_FAST_N:
                DECODE_UINT;
                fastn[unum] = POP();
                break;
                */

            case PYBC_STORE_NAME:
                DECODE_QSTR;
                printf("STORE_NAME %s", qstr_str(qstr));
                break;

                /*
            case PYBC_STORE_GLOBAL:
                DECODE_QSTR;
                rt_store_global(qstr, POP());
                break;

            case PYBC_STORE_ATTR:
                DECODE_QSTR;
                rt_store_attr(sp[0], qstr, sp[1]);
                sp += 2;
                break;

            case PYBC_STORE_SUBSCR:
                rt_store_subscr(sp[1], sp[0], sp[2]);
                sp += 3;
                break;

            case PYBC_DUP_TOP:
                obj1 = *sp;
                PUSH(obj1);
                break;

            case PYBC_DUP_TOP_TWO:
                sp -= 2;
                sp[0] = sp[2];
                sp[1] = sp[3];
                break;
                */

            case PYBC_POP_TOP:
                printf("POP_TOP");
                break;

                /*
            case PYBC_ROT_TWO:
                obj1 = sp[0];
                sp[0] = sp[1];
                sp[1] = obj1;
                break;

            case PYBC_ROT_THREE:
                obj1 = sp[0];
                sp[0] = sp[1];
                sp[1] = sp[2];
                sp[2] = obj1;
                break;
                */

            case PYBC_JUMP:
                DECODE_SLABEL;
                printf("JUMP %lu", ip + unum - ip_start);
                break;

            case PYBC_POP_JUMP_IF_TRUE:
                DECODE_SLABEL;
                printf("POP_JUMP_IF_TRUE %lu", ip + unum - ip_start);
                break;

                /*
            case PYBC_POP_JUMP_IF_FALSE:
                DECODE_SLABEL;
                if (!rt_is_true(POP())) {
                    ip += unum;
                }
                break;

            case PYBC_JUMP_IF_TRUE_OR_POP:
                DECODE_SLABEL;
                if (rt_is_true(*sp)) {
                    ip += unum;
                } else {
                    sp++;
                }
                break;

            case PYBC_JUMP_IF_FALSE_OR_POP:
                DECODE_SLABEL;
                if (rt_is_true(*sp)) {
                    sp++;
                } else {
                    ip += unum;
                }
                break;

            case PYBC_SETUP_EXCEPT:
                DECODE_ULABEL; // except labels are always forward
                *++exc_sp = (machine_uint_t)ip + unum;
                *++exc_sp = (machine_uint_t)sp;
                break;

            case PYBC_END_FINALLY:
                // not implemented
                // if TOS is an exception, reraises the exception (3 values on TOS)
                // if TOS is an integer, does something else
                // if TOS is None, just pops it and continues
                // else error
                assert(0);
                break;

            case PYBC_GET_ITER:
                *sp = rt_getiter(*sp);
                break;

            case PYBC_FOR_ITER:
                DECODE_ULABEL; // the jump offset if iteration finishes; for labels are always forward
                obj1 = rt_iternext(*sp);
                if (obj1 == py_const_stop_iteration) {
                    ++sp; // pop the exhausted iterator
                    ip += unum; // jump to after for-block
                } else {
                    PUSH(obj1); // push the next iteration value
                }
                break;

            case PYBC_POP_BLOCK:
                // pops block and restores the stack
                assert(0);
                break;

            case PYBC_POP_EXCEPT:
                // TODO need to work out how blocks work etc
                // pops block, checks it's an exception block, and restores the stack, saving the 3 exception values to local threadstate
                assert(exc_sp >= &exc_stack[0]);
                //sp = (py_obj_t*)(*exc_sp--);
                //exc_sp--; // discard ip
                exc_sp -= 2;
                //sp += 3; // pop 3 exception values
                break;

            case PYBC_UNARY_OP:
                unum = *ip++;
                *sp = rt_unary_op(unum, *sp);
                break;
                */

            case PYBC_BINARY_OP:
                unum = *ip++;
                printf("BINARY_OP %lu", unum);
                break;

            case PYBC_COMPARE_OP:
                unum = *ip++;
                printf("COMPARE_OP %lu", unum);
                break;

                /*
            case PYBC_BUILD_TUPLE:
                DECODE_UINT;
                obj1 = rt_build_tuple(unum, sp);
                sp += unum - 1;
                *sp = obj1;
                break;

            case PYBC_BUILD_LIST:
                DECODE_UINT;
                obj1 = rt_build_list(unum, sp);
                sp += unum - 1;
                *sp = obj1;
                break;

            case PYBC_LIST_APPEND:
                DECODE_UINT;
                // I think it's guaranteed by the compiler that sp[unum] is a list
                rt_list_append(sp[unum], sp[0]);
                sp++;
                break;

            case PYBC_BUILD_MAP:
                DECODE_UINT;
                PUSH(rt_build_map(unum));
                break;

            case PYBC_STORE_MAP:
                sp += 2;
                rt_store_map(sp[0], sp[-2], sp[-1]);
                break;

            case PYBC_MAP_ADD:
                DECODE_UINT;
                // I think it's guaranteed by the compiler that sp[unum + 1] is a map
                rt_store_map(sp[unum + 1], sp[0], sp[1]);
                sp += 2;
                break;

            case PYBC_BUILD_SET:
                DECODE_UINT;
                obj1 = rt_build_set(unum, sp);
                sp += unum - 1;
                *sp = obj1;
                break;

            case PYBC_SET_ADD:
                DECODE_UINT;
                // I think it's guaranteed by the compiler that sp[unum] is a set
                rt_store_set(sp[unum], sp[0]);
                sp++;
                break;
                */

            case PYBC_MAKE_FUNCTION:
                DECODE_UINT;
                printf("MAKE_FUNCTION %lu", unum);
                break;

            case PYBC_CALL_FUNCTION:
                DECODE_UINT;
                assert((unum & 0xff00) == 0); // n_keyword
                unum &= 0xff; // n_positional
                printf("CALL_FUNCTION %lu", unum);
                break;

            case PYBC_CALL_METHOD:
                DECODE_UINT;
                assert((unum & 0xff00) == 0); // n_keyword
                unum &= 0xff;
                printf("CALL_METHOD %lu", unum);
                break;

            case PYBC_RETURN_VALUE:
                printf("RETURN_VALUE");
                break;

                /*
            case PYBC_YIELD_VALUE:
                nlr_pop();
                *ip_in_out = ip;
                fastn[0] = fast0;
                fastn[1] = fast1;
                fastn[2] = fast2;
                *sp_in_out = sp;
                return true;
                */

            default:
                printf("code %p, byte code 0x%02x not implemented\n", ip, op);
                assert(0);
                return;
        }
        printf("\n");
    }
}