596 lines
22 KiB
C
596 lines
22 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 "nlr.h"
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#include "misc.h"
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#include "mpconfig.h"
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#include "qstr.h"
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#include "obj.h"
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#include "runtime.h"
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#include "bc0.h"
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#include "bc.h"
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// (value) stack grows down (to be compatible with native code when passing pointers to the stack), top element is pointed to
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// exception stack grows up, top element is pointed to
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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_ULABEL do { unum = (ip[0] | (ip[1] << 8)); ip += 2; } while (0)
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#define DECODE_SLABEL do { unum = (ip[0] | (ip[1] << 8)) - 0x8000; ip += 2; } while (0)
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#define DECODE_QSTR do { qst = *ip++; if (qst > 127) { qst = ((qst & 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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#define TOP() (*sp)
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#define SET_TOP(val) *sp = (val)
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mp_obj_t mp_execute_byte_code(const byte *code, const mp_obj_t *args, uint n_args, uint n_state) {
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n_state += 1; // XXX there is a bug somewhere which doesn't count enough state... (conwaylife and mandel have the bug)
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// allocate state for locals and stack
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mp_obj_t temp_state[10];
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mp_obj_t *state = &temp_state[0];
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if (n_state > 10) {
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state = m_new(mp_obj_t, n_state);
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}
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mp_obj_t *sp = &state[0] - 1;
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// init args
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for (int i = 0; i < n_args; i++) {
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assert(i < 8);
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state[n_state - 1 - i] = args[i];
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}
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const byte *ip = code;
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// get code info size
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machine_uint_t code_info_size = ip[0] | (ip[1] << 8) | (ip[2] << 16) | (ip[3] << 24);
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ip += code_info_size;
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// execute prelude to make any cells (closed over variables)
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{
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for (uint n_local = *ip++; n_local > 0; n_local--) {
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uint local_num = *ip++;
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if (local_num < n_args) {
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state[n_state - 1 - local_num] = mp_obj_new_cell(state[n_state - 1 - local_num]);
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} else {
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state[n_state - 1 - local_num] = mp_obj_new_cell(MP_OBJ_NULL);
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}
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}
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}
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// execute the byte code
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if (mp_execute_byte_code_2(code, &ip, &state[n_state - 1], &sp)) {
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// it shouldn't yield
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assert(0);
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}
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// TODO check fails if, eg, return from within for loop
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//assert(sp == &state[17]);
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return *sp;
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}
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// fastn has items in reverse order (fastn[0] is local[0], fastn[-1] is local[1], etc)
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// sp points to bottom of stack which grows up
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bool mp_execute_byte_code_2(const byte *code_info, const byte **ip_in_out, mp_obj_t *fastn, mp_obj_t **sp_in_out) {
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// careful: be sure to declare volatile any variables read in the exception handler (written is ok, I think)
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const byte *ip = *ip_in_out;
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mp_obj_t *sp = *sp_in_out;
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machine_uint_t unum;
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qstr qst;
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mp_obj_t obj1, obj2;
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mp_obj_t fast0 = fastn[0], fast1 = fastn[-1], fast2 = fastn[-2];
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nlr_buf_t nlr;
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volatile machine_uint_t currently_in_except_block = 0; // 0 or 1, to detect nested exceptions
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machine_uint_t exc_stack[8]; // on the exception stack we store (ip, sp | X) for each block, X = previous value of currently_in_except_block
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machine_uint_t *volatile exc_sp = &exc_stack[0] - 1; // stack grows up, exc_sp points to top of stack
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const byte *volatile save_ip = ip; // this is so we can access ip in the exception handler without making ip volatile (which means the compiler can't keep it in a register in the main loop)
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// TODO if an exception occurs, do fast[0,1,2] become invalid??
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// outer exception handling loop
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for (;;) {
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if (nlr_push(&nlr) == 0) {
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// loop to execute byte code
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for (;;) {
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save_ip = ip;
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int op = *ip++;
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switch (op) {
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case MP_BC_LOAD_CONST_FALSE:
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PUSH(mp_const_false);
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break;
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case MP_BC_LOAD_CONST_NONE:
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PUSH(mp_const_none);
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break;
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case MP_BC_LOAD_CONST_TRUE:
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PUSH(mp_const_true);
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break;
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case MP_BC_LOAD_CONST_ELLIPSIS:
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PUSH(mp_const_ellipsis);
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break;
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case MP_BC_LOAD_CONST_SMALL_INT:
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unum = (ip[0] | (ip[1] << 8) | (ip[2] << 16)) - 0x800000;
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ip += 3;
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PUSH(MP_OBJ_NEW_SMALL_INT(unum));
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break;
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case MP_BC_LOAD_CONST_INT:
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DECODE_QSTR;
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PUSH(mp_obj_new_int_from_long_str(qstr_str(qst)));
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break;
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case MP_BC_LOAD_CONST_DEC:
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DECODE_QSTR;
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PUSH(rt_load_const_dec(qst));
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break;
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case MP_BC_LOAD_CONST_ID:
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DECODE_QSTR;
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PUSH(rt_load_const_str(qst)); // TODO
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break;
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case MP_BC_LOAD_CONST_BYTES:
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DECODE_QSTR;
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PUSH(rt_load_const_str(qst)); // TODO
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break;
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case MP_BC_LOAD_CONST_STRING:
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DECODE_QSTR;
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PUSH(rt_load_const_str(qst));
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break;
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case MP_BC_LOAD_FAST_0:
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PUSH(fast0);
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break;
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case MP_BC_LOAD_FAST_1:
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PUSH(fast1);
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break;
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case MP_BC_LOAD_FAST_2:
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PUSH(fast2);
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break;
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case MP_BC_LOAD_FAST_N:
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DECODE_UINT;
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PUSH(fastn[-unum]);
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break;
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case MP_BC_LOAD_DEREF:
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DECODE_UINT;
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if (unum == 0) {
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obj1 = fast0;
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} else if (unum == 1) {
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obj1 = fast1;
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} else if (unum == 2) {
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obj1 = fast2;
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} else {
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obj1 = fastn[-unum];
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}
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PUSH(rt_get_cell(obj1));
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break;
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case MP_BC_LOAD_NAME:
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DECODE_QSTR;
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PUSH(rt_load_name(qst));
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break;
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case MP_BC_LOAD_GLOBAL:
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DECODE_QSTR;
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PUSH(rt_load_global(qst));
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break;
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case MP_BC_LOAD_ATTR:
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DECODE_QSTR;
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SET_TOP(rt_load_attr(TOP(), qst));
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break;
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case MP_BC_LOAD_METHOD:
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DECODE_QSTR;
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rt_load_method(*sp, qst, sp);
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sp += 1;
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break;
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case MP_BC_LOAD_BUILD_CLASS:
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PUSH(rt_load_build_class());
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break;
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case MP_BC_STORE_FAST_0:
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fast0 = POP();
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break;
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case MP_BC_STORE_FAST_1:
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fast1 = POP();
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break;
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case MP_BC_STORE_FAST_2:
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fast2 = POP();
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break;
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case MP_BC_STORE_FAST_N:
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DECODE_UINT;
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fastn[-unum] = POP();
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break;
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case MP_BC_STORE_DEREF:
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DECODE_UINT;
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if (unum == 0) {
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obj1 = fast0;
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} else if (unum == 1) {
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obj1 = fast1;
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} else if (unum == 2) {
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obj1 = fast2;
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} else {
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obj1 = fastn[-unum];
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}
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rt_set_cell(obj1, POP());
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break;
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case MP_BC_STORE_NAME:
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DECODE_QSTR;
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rt_store_name(qst, POP());
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break;
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case MP_BC_STORE_GLOBAL:
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DECODE_QSTR;
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rt_store_global(qst, POP());
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break;
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case MP_BC_STORE_ATTR:
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DECODE_QSTR;
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rt_store_attr(sp[0], qst, sp[-1]);
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sp -= 2;
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break;
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case MP_BC_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 MP_BC_DUP_TOP:
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obj1 = TOP();
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PUSH(obj1);
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break;
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case MP_BC_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 MP_BC_POP_TOP:
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sp -= 1;
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break;
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case MP_BC_ROT_TWO:
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obj1 = sp[0];
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sp[0] = sp[-1];
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sp[-1] = obj1;
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break;
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case MP_BC_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 MP_BC_JUMP:
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DECODE_SLABEL;
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ip += unum;
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break;
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case MP_BC_POP_JUMP_IF_TRUE:
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DECODE_SLABEL;
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if (rt_is_true(POP())) {
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ip += unum;
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}
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break;
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case MP_BC_POP_JUMP_IF_FALSE:
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DECODE_SLABEL;
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if (!rt_is_true(POP())) {
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ip += unum;
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}
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break;
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case MP_BC_JUMP_IF_TRUE_OR_POP:
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DECODE_SLABEL;
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if (rt_is_true(TOP())) {
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ip += unum;
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} else {
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sp--;
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}
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break;
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case MP_BC_JUMP_IF_FALSE_OR_POP:
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DECODE_SLABEL;
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if (rt_is_true(TOP())) {
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sp--;
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} else {
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ip += unum;
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}
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break;
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/* we are trying to get away without using this opcode
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case MP_BC_SETUP_LOOP:
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DECODE_UINT;
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// push_block(MP_BC_SETUP_LOOP, ip + unum, sp)
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break;
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*/
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// TODO this might need more sophisticated handling when breaking from within an except
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case MP_BC_BREAK_LOOP:
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DECODE_ULABEL;
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ip += unum;
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break;
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// TODO this might need more sophisticated handling when breaking from within an except
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case MP_BC_CONTINUE_LOOP:
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DECODE_ULABEL;
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ip += unum;
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break;
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// matched against: POP_BLOCK or POP_EXCEPT (anything else?)
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case MP_BC_SETUP_EXCEPT:
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DECODE_ULABEL; // except labels are always forward
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*++exc_sp = (machine_uint_t)ip + unum;
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*++exc_sp = (((machine_uint_t)sp) | currently_in_except_block);
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currently_in_except_block = 0; // in a try block now
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break;
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case MP_BC_END_FINALLY:
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// not implemented
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// if TOS is an exception, reraises the exception (3 values on TOS)
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// if TOS is an integer, does something else
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// if TOS is None, just pops it and continues
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// else error
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assert(0);
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break;
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case MP_BC_GET_ITER:
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SET_TOP(rt_getiter(TOP()));
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break;
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case MP_BC_FOR_ITER:
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DECODE_ULABEL; // the jump offset if iteration finishes; for labels are always forward
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obj1 = rt_iternext(TOP());
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if (obj1 == mp_const_stop_iteration) {
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--sp; // pop the exhausted iterator
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ip += unum; // jump to after for-block
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} else {
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PUSH(obj1); // push the next iteration value
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}
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break;
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// matched against: SETUP_EXCEPT, SETUP_FINALLY, SETUP_WITH
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case MP_BC_POP_BLOCK:
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// we are exiting an exception handler, so pop the last one of the exception-stack
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assert(exc_sp >= &exc_stack[0]);
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currently_in_except_block = (exc_sp[0] & 1); // restore previous state
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exc_sp -= 2; // pop back to previous exception handler
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break;
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// matched against: SETUP_EXCEPT
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case MP_BC_POP_EXCEPT:
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// TODO need to work out how blocks work etc
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// pops block, checks it's an exception block, and restores the stack, saving the 3 exception values to local threadstate
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assert(exc_sp >= &exc_stack[0]);
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//sp = (mp_obj_t*)(*exc_sp--);
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//exc_sp--; // discard ip
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currently_in_except_block = (exc_sp[0] & 1); // restore previous state
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exc_sp -= 2; // pop back to previous exception handler
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//sp -= 3; // pop 3 exception values
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break;
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case MP_BC_UNARY_OP:
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unum = *ip++;
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SET_TOP(rt_unary_op(unum, TOP()));
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break;
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case MP_BC_BINARY_OP:
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unum = *ip++;
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obj2 = POP();
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obj1 = TOP();
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SET_TOP(rt_binary_op(unum, obj1, obj2));
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break;
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case MP_BC_BUILD_TUPLE:
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DECODE_UINT;
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sp -= unum - 1;
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SET_TOP(rt_build_tuple(unum, sp));
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break;
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case MP_BC_BUILD_LIST:
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DECODE_UINT;
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sp -= unum - 1;
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SET_TOP(rt_build_list(unum, sp));
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break;
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case MP_BC_LIST_APPEND:
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DECODE_UINT;
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// I think it's guaranteed by the compiler that sp[unum] is a list
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rt_list_append(sp[-unum], sp[0]);
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sp--;
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break;
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case MP_BC_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 MP_BC_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 MP_BC_MAP_ADD:
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DECODE_UINT;
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// I think it's guaranteed by the compiler that sp[-unum - 1] is a map
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rt_store_map(sp[-unum - 1], sp[0], sp[-1]);
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sp -= 2;
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break;
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case MP_BC_BUILD_SET:
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DECODE_UINT;
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sp -= unum - 1;
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SET_TOP(rt_build_set(unum, sp));
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break;
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case MP_BC_SET_ADD:
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DECODE_UINT;
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// I think it's guaranteed by the compiler that sp[-unum] is a set
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rt_store_set(sp[-unum], sp[0]);
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sp--;
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break;
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#if MICROPY_ENABLE_SLICE
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case MP_BC_BUILD_SLICE:
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DECODE_UINT;
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if (unum == 2) {
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obj2 = POP();
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obj1 = TOP();
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SET_TOP(mp_obj_new_slice(obj1, obj2, NULL));
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} else {
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printf("3-argument slice is not supported\n");
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assert(0);
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}
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break;
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#endif
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case MP_BC_UNPACK_SEQUENCE:
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DECODE_UINT;
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rt_unpack_sequence(sp[0], unum, sp);
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sp += unum - 1;
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break;
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case MP_BC_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 MP_BC_MAKE_CLOSURE:
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DECODE_UINT;
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obj1 = POP();
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PUSH(rt_make_closure_from_id(unum, obj1));
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break;
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case MP_BC_CALL_FUNCTION:
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DECODE_UINT;
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// unum & 0xff == n_positional
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// (unum >> 8) & 0xff == n_keyword
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sp -= (unum & 0xff) + ((unum >> 7) & 0x1fe);
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SET_TOP(rt_call_function_n_kw(*sp, unum & 0xff, (unum >> 8) & 0xff, sp + 1));
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break;
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case MP_BC_CALL_METHOD:
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DECODE_UINT;
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// unum & 0xff == n_positional
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// (unum >> 8) & 0xff == n_keyword
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sp -= (unum & 0xff) + ((unum >> 7) & 0x1fe) + 1;
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SET_TOP(rt_call_method_n_kw(unum & 0xff, (unum >> 8) & 0xff, sp));
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break;
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case MP_BC_RETURN_VALUE:
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nlr_pop();
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*sp_in_out = sp;
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assert(exc_sp == &exc_stack[0] - 1);
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return false;
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case MP_BC_RAISE_VARARGS:
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unum = *ip++;
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assert(unum == 1);
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obj1 = POP();
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nlr_jump(obj1);
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case MP_BC_YIELD_VALUE:
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nlr_pop();
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*ip_in_out = ip;
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fastn[0] = fast0;
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fastn[-1] = fast1;
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fastn[-2] = fast2;
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*sp_in_out = sp;
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return true;
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|
case MP_BC_IMPORT_NAME:
|
|
DECODE_QSTR;
|
|
obj1 = POP();
|
|
SET_TOP(rt_import_name(qst, obj1, TOP()));
|
|
break;
|
|
|
|
case MP_BC_IMPORT_FROM:
|
|
DECODE_QSTR;
|
|
obj1 = rt_import_from(TOP(), qst);
|
|
PUSH(obj1);
|
|
break;
|
|
|
|
default:
|
|
printf("code %p, byte code 0x%02x not implemented\n", ip, op);
|
|
assert(0);
|
|
nlr_pop();
|
|
return false;
|
|
}
|
|
}
|
|
|
|
} else {
|
|
// exception occurred
|
|
|
|
// set file and line number that the exception occurred at
|
|
if (MP_OBJ_IS_TYPE(nlr.ret_val, &exception_type)) {
|
|
machine_uint_t code_info_size = code_info[0] | (code_info[1] << 8) | (code_info[2] << 16) | (code_info[3] << 24);
|
|
qstr source_file = code_info[4] | (code_info[5] << 8) | (code_info[6] << 16) | (code_info[7] << 24);
|
|
qstr block_name = code_info[8] | (code_info[9] << 8) | (code_info[10] << 16) | (code_info[11] << 24);
|
|
machine_uint_t source_line = 1;
|
|
machine_uint_t bc = save_ip - code_info - code_info_size;
|
|
//printf("find %lu %d %d\n", bc, code_info[12], code_info[13]);
|
|
for (const byte* ci = code_info + 12; bc >= ci[0]; ci += 2) {
|
|
bc -= ci[0];
|
|
source_line += ci[1];
|
|
if (ci[0] == 0 && ci[1] == 0) {
|
|
break;
|
|
}
|
|
}
|
|
mp_obj_exception_add_traceback(nlr.ret_val, source_file, source_line, block_name);
|
|
}
|
|
|
|
while (currently_in_except_block) {
|
|
// nested exception
|
|
|
|
assert(exc_sp >= &exc_stack[0]);
|
|
|
|
// TODO make a proper message for nested exception
|
|
// at the moment we are just raising the very last exception (the one that caused the nested exception)
|
|
|
|
// move up to previous exception handler
|
|
currently_in_except_block = (exc_sp[0] & 1); // restore previous state
|
|
exc_sp -= 2; // pop back to previous exception handler
|
|
}
|
|
|
|
if (exc_sp >= &exc_stack[0]) {
|
|
// set flag to indicate that we are now handling an exception
|
|
currently_in_except_block = 1;
|
|
|
|
// catch exception and pass to byte code
|
|
sp = (mp_obj_t*)(exc_sp[0] & (~((machine_uint_t)1)));
|
|
ip = (const byte*)(exc_sp[-1]);
|
|
// push(traceback, exc-val, exc-type)
|
|
PUSH(mp_const_none);
|
|
PUSH(nlr.ret_val);
|
|
PUSH(nlr.ret_val); // TODO should be type(nlr.ret_val), I think...
|
|
|
|
} else {
|
|
// re-raise exception to higher level
|
|
// TODO what to do if this is a generator??
|
|
nlr_jump(nlr.ret_val);
|
|
}
|
|
}
|
|
}
|
|
}
|