273 lines
7.5 KiB
C
273 lines
7.5 KiB
C
#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include "misc.h"
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#include "machine.h"
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#include "runtime.h"
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#include "vm.h"
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#define DECODE_UINT do { unum = *ip++; if (unum > 127) { unum = ((unum & 0x3f) << 8) | (*ip++); } } while (0)
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#define DECODE_QSTR do { qstr = *ip++; if (qstr > 127) { qstr = ((qstr & 0x3f) << 8) | (*ip++); } } while (0)
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#define PUSH(val) *--sp = (val)
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#define POP() (*sp++)
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py_obj_t py_execute_byte_code(byte *code, uint len, py_obj_t *args, uint n_args) {
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byte *ip = code;
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py_obj_t stack[10];
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py_obj_t *sp = &stack[10]; // stack grows down, sp points to top of stack
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machine_uint_t unum;
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machine_int_t snum;
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qstr qstr;
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py_obj_t obj1, obj2;
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py_obj_t fast0 = NULL, fast1 = NULL, fast2 = NULL, fastn[4] = {NULL, NULL, NULL, NULL};
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// init args
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for (int i = 0; i < n_args; i++) {
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if (i == 0) {
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fast0 = args[0];
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} else if (i == 1) {
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fast1 = args[1];
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} else if (i == 2) {
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fast2 = args[2];
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} else {
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assert(i - 3 < 4);
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fastn[i - 3] = args[i];
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}
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}
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// execute byte code
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for (;;) {
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int op = *ip++;
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switch (op) {
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case PYBC_LOAD_CONST_FALSE:
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PUSH(py_const_false);
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break;
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case PYBC_LOAD_CONST_NONE:
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PUSH(py_const_none);
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break;
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case PYBC_LOAD_CONST_TRUE:
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PUSH(py_const_true);
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break;
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case PYBC_LOAD_CONST_SMALL_INT:
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snum = ip[0] | (ip[1] << 8);
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if (snum & 0x8000) {
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snum |= ~0xffff;
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}
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ip += 2;
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PUSH((py_obj_t)(snum << 1 | 1));
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break;
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case PYBC_LOAD_CONST_ID:
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DECODE_QSTR;
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PUSH(rt_load_const_str(qstr)); // TODO
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break;
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case PYBC_LOAD_CONST_STRING:
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DECODE_QSTR;
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PUSH(rt_load_const_str(qstr));
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break;
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case PYBC_LOAD_FAST_0:
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PUSH(fast0);
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break;
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case PYBC_LOAD_FAST_1:
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PUSH(fast1);
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break;
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case PYBC_LOAD_FAST_2:
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PUSH(fast2);
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break;
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case PYBC_LOAD_FAST_N:
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DECODE_UINT;
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PUSH(fastn[unum - 3]);
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break;
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case PYBC_LOAD_NAME:
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DECODE_QSTR;
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PUSH(rt_load_name(qstr));
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break;
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case PYBC_LOAD_GLOBAL:
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DECODE_QSTR;
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PUSH(rt_load_global(qstr));
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break;
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case PYBC_LOAD_ATTR:
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DECODE_QSTR;
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*sp = rt_load_attr(*sp, qstr);
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break;
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case PYBC_LOAD_METHOD:
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DECODE_QSTR;
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sp -= 1;
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rt_load_method(sp[1], qstr, sp);
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break;
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case PYBC_LOAD_BUILD_CLASS:
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PUSH(rt_load_build_class());
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break;
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case PYBC_STORE_FAST_0:
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fast0 = POP();
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break;
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case PYBC_STORE_FAST_1:
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fast1 = POP();
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break;
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case PYBC_STORE_FAST_2:
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fast2 = POP();
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break;
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case PYBC_STORE_FAST_N:
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DECODE_UINT;
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fastn[unum - 3] = POP();
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break;
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case PYBC_STORE_NAME:
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DECODE_QSTR;
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rt_store_name(qstr, POP());
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break;
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case PYBC_STORE_SUBSCR:
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rt_store_subscr(sp[1], sp[0], sp[2]);
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sp += 3;
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break;
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case PYBC_DUP_TOP:
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obj1 = *sp;
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PUSH(obj1);
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break;
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case PYBC_DUP_TOP_TWO:
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sp -= 2;
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sp[0] = sp[2];
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sp[1] = sp[3];
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break;
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case PYBC_POP_TOP:
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++sp;
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break;
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case PYBC_ROT_THREE:
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obj1 = sp[0];
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sp[0] = sp[1];
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sp[1] = sp[2];
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sp[2] = obj1;
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break;
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case PYBC_JUMP:
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DECODE_UINT;
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ip = code + unum;
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break;
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case PYBC_POP_JUMP_IF_FALSE:
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DECODE_UINT;
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if (!rt_is_true(POP())) {
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ip = code + unum;
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}
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break;
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case PYBC_SETUP_LOOP:
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DECODE_UINT;
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break;
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case PYBC_POP_BLOCK:
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break;
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case PYBC_BINARY_OP:
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unum = *ip++;
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obj2 = POP();
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obj1 = *sp;
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*sp = rt_binary_op(unum, obj1, obj2);
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break;
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case PYBC_COMPARE_OP:
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unum = *ip++;
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obj2 = POP();
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obj1 = *sp;
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*sp = rt_compare_op(unum, obj1, obj2);
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break;
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case PYBC_BUILD_LIST:
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DECODE_UINT;
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obj1 = rt_build_list(unum, sp);
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sp += unum - 1;
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*sp = obj1;
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break;
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case PYBC_BUILD_MAP:
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DECODE_UINT;
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PUSH(rt_build_map(unum));
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break;
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case PYBC_STORE_MAP:
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sp += 2;
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rt_store_map(sp[0], sp[-2], sp[-1]);
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break;
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case PYBC_BUILD_SET:
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DECODE_UINT;
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obj1 = rt_build_set(unum, sp);
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sp += unum - 1;
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*sp = obj1;
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break;
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case PYBC_MAKE_FUNCTION:
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DECODE_UINT;
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PUSH(rt_make_function_from_id(unum));
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break;
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case PYBC_CALL_FUNCTION:
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DECODE_UINT;
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assert((unum & 0xff00) == 0); // n_keyword
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// switch on n_positional
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if ((unum & 0xff) == 0) {
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*sp = rt_call_function_0(*sp);
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} else if ((unum & 0xff) == 1) {
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obj1 = *sp++; // the single argument
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*sp = rt_call_function_1(*sp, obj1);
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} else if ((unum & 0xff) == 2) {
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obj2 = *sp++; // the second argument
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obj1 = *sp++; // the first argument
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*sp = rt_call_function_2(*sp, obj1, obj2);
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} else {
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assert(0);
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}
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break;
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case PYBC_CALL_METHOD:
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DECODE_UINT;
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assert((unum & 0xff00) == 0); // n_keyword
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// switch on n_positional
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if ((unum & 0xff) == 0) {
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obj1 = *sp++; // the self object (or NULL)
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*sp = rt_call_method_1(*sp, obj1);
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} else if ((unum & 0xff) == 1) {
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obj2 = *sp++; // the first argument
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obj1 = *sp++; // the self object (or NULL)
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*sp = rt_call_function_2(*sp, obj1, obj2);
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} else {
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assert(0);
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}
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break;
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case PYBC_RETURN_VALUE:
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return *sp;
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default:
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printf("code %p, offset %u, byte code 0x%02x not implemented\n", code, (uint)(ip - code), op);
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assert(0);
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return py_const_none;
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}
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}
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}
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