1058 lines
42 KiB
C
1058 lines
42 KiB
C
/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014 Damien P. George
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* Copyright (c) 2014 Paul Sokolovsky
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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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 "mpconfig.h"
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#include "nlr.h"
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#include "misc.h"
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#include "qstr.h"
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#include "obj.h"
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#include "emitglue.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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#include "objgenerator.h"
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// With these macros you can tune the maximum number of state slots
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// that will be allocated on the stack. Any function that needs more
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// than this will use the heap.
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#define VM_MAX_STATE_ON_STACK (10)
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#define VM_MAX_EXC_STATE_ON_STACK (4)
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#define DETECT_VM_STACK_OVERFLOW (0)
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#if 0
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#define TRACE(ip) mp_bytecode_print2(ip, 1);
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#else
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#define TRACE(ip)
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#endif
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// Value stack grows up (this makes it incompatible with native C stack, but
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// makes sure that arguments to functions are in natural order arg1..argN
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// (Python semantics mandates left-to-right evaluation order, including for
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// function arguments). Stack pointer is pre-incremented and points at the
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// top element.
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// Exception stack also grows up, top element is also pointed at.
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// Exception stack unwind reasons (WHY_* in CPython-speak)
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// TODO perhaps compress this to RETURN=0, JUMP>0, with number of unwinds
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// left to do encoded in the JUMP number
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typedef enum {
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UNWIND_RETURN = 1,
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UNWIND_JUMP,
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} mp_unwind_reason_t;
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#define DECODE_UINT do { \
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unum = 0; \
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do { \
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unum = (unum << 7) + (*ip & 0x7f); \
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} while ((*ip++ & 0x80) != 0); \
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} 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 { \
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qst = 0; \
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do { \
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qst = (qst << 7) + (*ip & 0x7f); \
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} while ((*ip++ & 0x80) != 0); \
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} while (0)
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#define DECODE_PTR do { \
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ip = (byte*)(((machine_uint_t)ip + sizeof(machine_uint_t) - 1) & (~(sizeof(machine_uint_t) - 1))); /* align ip */ \
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unum = *(machine_uint_t*)ip; \
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ip += sizeof(machine_uint_t); \
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} 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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#define PUSH_EXC_BLOCK() \
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DECODE_ULABEL; /* except labels are always forward */ \
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++exc_sp; \
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exc_sp->opcode = *save_ip; \
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exc_sp->handler = ip + unum; \
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exc_sp->val_sp = MP_TAGPTR_MAKE(sp, currently_in_except_block); \
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exc_sp->prev_exc = MP_OBJ_NULL; \
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currently_in_except_block = 0; /* in a try block now */
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#define POP_EXC_BLOCK() \
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currently_in_except_block = MP_TAGPTR_TAG(exc_sp->val_sp); /* restore previous state */ \
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exc_sp--; /* pop back to previous exception handler */
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mp_vm_return_kind_t mp_execute_bytecode(const byte *code, const mp_obj_t *args, uint n_args, const mp_obj_t *args2, uint n_args2, mp_obj_t *ret) {
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const byte *ip = code;
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// get code info size, and skip line number table
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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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// bytecode prelude: state size and exception stack size; 16 bit uints
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machine_uint_t n_state = ip[0] | (ip[1] << 8);
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machine_uint_t n_exc_stack = ip[2] | (ip[3] << 8);
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ip += 4;
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// allocate state for locals and stack
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mp_obj_t temp_state[VM_MAX_STATE_ON_STACK];
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mp_obj_t *state = &temp_state[0];
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#if DETECT_VM_STACK_OVERFLOW
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n_state += 1;
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#endif
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if (n_state > VM_MAX_STATE_ON_STACK) {
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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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// allocate state for exceptions
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mp_exc_stack_t exc_state[VM_MAX_EXC_STATE_ON_STACK];
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mp_exc_stack_t *exc_stack = &exc_state[0];
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if (n_exc_stack > VM_MAX_EXC_STATE_ON_STACK) {
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exc_stack = m_new(mp_exc_stack_t, n_exc_stack);
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}
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mp_exc_stack_t *exc_sp = &exc_stack[0] - 1;
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// init args
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for (uint i = 0; i < n_args; i++) {
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state[n_state - 1 - i] = args[i];
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}
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for (uint i = 0; i < n_args2; i++) {
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state[n_state - 1 - n_args - i] = args2[i];
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}
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// set rest of state to MP_OBJ_NULL
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for (uint i = 0; i < n_state - n_args - n_args2; i++) {
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state[i] = MP_OBJ_NULL;
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}
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// bytecode prelude: initialise closed over variables
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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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state[n_state - 1 - local_num] = mp_obj_new_cell(state[n_state - 1 - local_num]);
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}
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// execute the byte code
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mp_vm_return_kind_t vm_return_kind = mp_execute_bytecode2(code, &ip, &state[n_state - 1], &sp, exc_stack, &exc_sp, MP_OBJ_NULL);
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#if DETECT_VM_STACK_OVERFLOW
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// We can't check the case when an exception is returned in state[n_state - 1]
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// and there are no arguments, because in this case our detection slot may have
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// been overwritten by the returned exception (which is allowed).
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if (!(vm_return_kind == MP_VM_RETURN_EXCEPTION && n_args == 0 && n_args2 == 0)) {
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// Just check to see that we have at least 1 null object left in the state.
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bool overflow = true;
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for (uint i = 0; i < n_state - n_args - n_args2; i++) {
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if (state[i] == MP_OBJ_NULL) {
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overflow = false;
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break;
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}
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}
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if (overflow) {
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printf("VM stack overflow state=%p n_state+1=%u\n", state, n_state);
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assert(0);
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}
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}
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#endif
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mp_vm_return_kind_t ret_kind;
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switch (vm_return_kind) {
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case MP_VM_RETURN_NORMAL:
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// return value is in *sp
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*ret = *sp;
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ret_kind = MP_VM_RETURN_NORMAL;
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break;
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case MP_VM_RETURN_EXCEPTION:
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// return value is in state[n_state - 1]
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*ret = state[n_state - 1];
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ret_kind = MP_VM_RETURN_EXCEPTION;
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break;
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case MP_VM_RETURN_YIELD: // byte-code shouldn't yield
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default:
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assert(0);
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*ret = mp_const_none;
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ret_kind = MP_VM_RETURN_NORMAL;
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}
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// free the state if it was allocated on the heap
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if (n_state > VM_MAX_STATE_ON_STACK) {
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m_free(state, n_state);
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}
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// free the exception state if it was allocated on the heap
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if (n_exc_stack > VM_MAX_EXC_STATE_ON_STACK) {
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m_free(exc_stack, n_exc_stack);
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}
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return ret_kind;
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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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// returns:
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// MP_VM_RETURN_NORMAL, sp valid, return value in *sp
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// MP_VM_RETURN_YIELD, ip, sp valid, yielded value in *sp
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// MP_VM_RETURN_EXCEPTION, exception in fastn[0]
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mp_vm_return_kind_t mp_execute_bytecode2(const byte *code_info, const byte **ip_in_out,
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mp_obj_t *fastn, mp_obj_t **sp_in_out,
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mp_exc_stack_t *exc_stack, mp_exc_stack_t **exc_sp_in_out,
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volatile mp_obj_t inject_exc) {
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#if MICROPY_OPT_COMPUTED_GOTO
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#include "vmentrytable.h"
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#define DISPATCH() do { \
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TRACE(ip); \
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save_ip = ip; \
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goto *entry_table[*ip++]; \
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} while(0)
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#define ENTRY(op) entry_##op
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#define ENTRY_DEFAULT entry_default
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#else
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#define DISPATCH() break
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#define ENTRY(op) case op
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#define ENTRY_DEFAULT default
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#endif
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// nlr_raise needs to be implemented as a goto, so that the C compiler's flow analyser
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// sees that it's possible for us to jump from the dispatch loop to the exception
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// handler. Without this, the code may have a different stack layout in the dispatch
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// loop and the exception handler, leading to very obscure bugs.
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#define RAISE(o) do { nlr_pop(); nlr.ret_val = o; goto exception_handler; } while(0)
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// variables that are visible to the exception handler (declared volatile)
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volatile bool currently_in_except_block = MP_TAGPTR_TAG(*exc_sp_in_out); // 0 or 1, to detect nested exceptions
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mp_exc_stack_t *volatile exc_sp = MP_TAGPTR_PTR(*exc_sp_in_out); // stack grows up, exc_sp points to top of stack
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const byte *volatile save_ip = *ip_in_out; // 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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mp_obj_t *volatile save_sp = *sp_in_out; // this is so we can access sp in the exception handler when needed
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// outer exception handling loop
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for (;;) {
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nlr_buf_t nlr;
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outer_dispatch_loop:
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if (nlr_push(&nlr) == 0) {
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// local variables that are not visible to the exception handler
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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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// If we have exception to inject, now that we finish setting up
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// execution context, raise it. This works as if RAISE_VARARGS
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// bytecode was executed.
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// Injecting exc into yield from generator is a special case,
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// handled by MP_BC_YIELD_FROM itself
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if (inject_exc != MP_OBJ_NULL && *ip != MP_BC_YIELD_FROM) {
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obj1 = inject_exc;
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inject_exc = MP_OBJ_NULL;
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obj1 = mp_make_raise_obj(obj1);
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RAISE(obj1);
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}
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// loop to execute byte code
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for (;;) {
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dispatch_loop:
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#if MICROPY_OPT_COMPUTED_GOTO
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DISPATCH();
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#else
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TRACE(ip);
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save_ip = ip;
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switch (*ip++) {
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#endif
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ENTRY(MP_BC_LOAD_CONST_FALSE):
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PUSH(mp_const_false);
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DISPATCH();
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ENTRY(MP_BC_LOAD_CONST_NONE):
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PUSH(mp_const_none);
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DISPATCH();
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ENTRY(MP_BC_LOAD_CONST_TRUE):
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PUSH(mp_const_true);
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DISPATCH();
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ENTRY(MP_BC_LOAD_CONST_ELLIPSIS):
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PUSH((mp_obj_t)&mp_const_ellipsis_obj);
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DISPATCH();
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ENTRY(MP_BC_LOAD_CONST_SMALL_INT): {
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machine_int_t num = 0;
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if ((ip[0] & 0x40) != 0) {
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// Number is negative
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num--;
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}
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do {
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num = (num << 7) | (*ip & 0x7f);
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} while ((*ip++ & 0x80) != 0);
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PUSH(MP_OBJ_NEW_SMALL_INT(num));
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DISPATCH();
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}
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ENTRY(MP_BC_LOAD_CONST_INT):
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DECODE_QSTR;
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PUSH(mp_obj_new_int_from_qstr(qst));
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DISPATCH();
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ENTRY(MP_BC_LOAD_CONST_DEC):
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DECODE_QSTR;
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PUSH(mp_load_const_dec(qst));
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DISPATCH();
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ENTRY(MP_BC_LOAD_CONST_BYTES):
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DECODE_QSTR;
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PUSH(mp_load_const_bytes(qst));
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DISPATCH();
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ENTRY(MP_BC_LOAD_CONST_STRING):
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DECODE_QSTR;
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PUSH(mp_load_const_str(qst));
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DISPATCH();
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ENTRY(MP_BC_LOAD_NULL):
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PUSH(MP_OBJ_NULL);
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DISPATCH();
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ENTRY(MP_BC_LOAD_FAST_0):
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obj1 = fastn[0];
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goto load_check;
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ENTRY(MP_BC_LOAD_FAST_1):
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obj1 = fastn[-1];
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goto load_check;
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ENTRY(MP_BC_LOAD_FAST_2):
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obj1 = fastn[-2];
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goto load_check;
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ENTRY(MP_BC_LOAD_FAST_N):
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DECODE_UINT;
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obj1 = fastn[-unum];
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load_check:
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if (obj1 == MP_OBJ_NULL) {
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local_name_error:
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obj1 = mp_obj_new_exception_msg(&mp_type_NameError, "local variable referenced before assignment");
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RAISE(obj1);
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}
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PUSH(obj1);
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DISPATCH();
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ENTRY(MP_BC_LOAD_DEREF):
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DECODE_UINT;
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obj1 = mp_obj_cell_get(fastn[-unum]);
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goto load_check;
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ENTRY(MP_BC_LOAD_NAME):
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DECODE_QSTR;
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PUSH(mp_load_name(qst));
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DISPATCH();
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ENTRY(MP_BC_LOAD_GLOBAL):
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DECODE_QSTR;
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PUSH(mp_load_global(qst));
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DISPATCH();
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|
|
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ENTRY(MP_BC_LOAD_ATTR):
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DECODE_QSTR;
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SET_TOP(mp_load_attr(TOP(), qst));
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DISPATCH();
|
|
|
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ENTRY(MP_BC_LOAD_METHOD):
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DECODE_QSTR;
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mp_load_method(*sp, qst, sp);
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sp += 1;
|
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DISPATCH();
|
|
|
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ENTRY(MP_BC_LOAD_BUILD_CLASS):
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PUSH(mp_load_build_class());
|
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DISPATCH();
|
|
|
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ENTRY(MP_BC_LOAD_SUBSCR):
|
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obj1 = POP();
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SET_TOP(mp_obj_subscr(TOP(), obj1, MP_OBJ_SENTINEL));
|
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DISPATCH();
|
|
|
|
ENTRY(MP_BC_STORE_FAST_0):
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fastn[0] = POP();
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_STORE_FAST_1):
|
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fastn[-1] = POP();
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_STORE_FAST_2):
|
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fastn[-2] = POP();
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_STORE_FAST_N):
|
|
DECODE_UINT;
|
|
fastn[-unum] = POP();
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_STORE_DEREF):
|
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DECODE_UINT;
|
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mp_obj_cell_set(fastn[-unum], POP());
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_STORE_NAME):
|
|
DECODE_QSTR;
|
|
mp_store_name(qst, POP());
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_STORE_GLOBAL):
|
|
DECODE_QSTR;
|
|
mp_store_global(qst, POP());
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_STORE_ATTR):
|
|
DECODE_QSTR;
|
|
mp_store_attr(sp[0], qst, sp[-1]);
|
|
sp -= 2;
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_STORE_SUBSCR):
|
|
mp_obj_subscr(sp[-1], sp[0], sp[-2]);
|
|
sp -= 3;
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_DELETE_FAST):
|
|
DECODE_UINT;
|
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if (fastn[-unum] == MP_OBJ_NULL) {
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goto local_name_error;
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}
|
|
fastn[-unum] = MP_OBJ_NULL;
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_DELETE_DEREF):
|
|
DECODE_UINT;
|
|
if (mp_obj_cell_get(fastn[-unum]) == MP_OBJ_NULL) {
|
|
goto local_name_error;
|
|
}
|
|
mp_obj_cell_set(fastn[-unum], MP_OBJ_NULL);
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_DELETE_NAME):
|
|
DECODE_QSTR;
|
|
mp_delete_name(qst);
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_DELETE_GLOBAL):
|
|
DECODE_QSTR;
|
|
mp_delete_global(qst);
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_DUP_TOP):
|
|
obj1 = TOP();
|
|
PUSH(obj1);
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_DUP_TOP_TWO):
|
|
sp += 2;
|
|
sp[0] = sp[-2];
|
|
sp[-1] = sp[-3];
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_POP_TOP):
|
|
sp -= 1;
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_ROT_TWO):
|
|
obj1 = sp[0];
|
|
sp[0] = sp[-1];
|
|
sp[-1] = obj1;
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_ROT_THREE):
|
|
obj1 = sp[0];
|
|
sp[0] = sp[-1];
|
|
sp[-1] = sp[-2];
|
|
sp[-2] = obj1;
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_JUMP):
|
|
DECODE_SLABEL;
|
|
ip += unum;
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_POP_JUMP_IF_TRUE):
|
|
DECODE_SLABEL;
|
|
if (mp_obj_is_true(POP())) {
|
|
ip += unum;
|
|
}
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_POP_JUMP_IF_FALSE):
|
|
DECODE_SLABEL;
|
|
if (!mp_obj_is_true(POP())) {
|
|
ip += unum;
|
|
}
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_JUMP_IF_TRUE_OR_POP):
|
|
DECODE_SLABEL;
|
|
if (mp_obj_is_true(TOP())) {
|
|
ip += unum;
|
|
} else {
|
|
sp--;
|
|
}
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_JUMP_IF_FALSE_OR_POP):
|
|
DECODE_SLABEL;
|
|
if (mp_obj_is_true(TOP())) {
|
|
sp--;
|
|
} else {
|
|
ip += unum;
|
|
}
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_SETUP_WITH):
|
|
obj1 = TOP();
|
|
SET_TOP(mp_load_attr(obj1, MP_QSTR___exit__));
|
|
mp_load_method(obj1, MP_QSTR___enter__, sp + 1);
|
|
obj2 = mp_call_method_n_kw(0, 0, sp + 1);
|
|
PUSH_EXC_BLOCK();
|
|
PUSH(obj2);
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_WITH_CLEANUP): {
|
|
// Arriving here, there's "exception control block" on top of stack,
|
|
// and __exit__ bound method underneath it. Bytecode calls __exit__,
|
|
// and "deletes" it off stack, shifting "exception control block"
|
|
// to its place.
|
|
static const mp_obj_t no_exc[] = {mp_const_none, mp_const_none, mp_const_none};
|
|
if (TOP() == mp_const_none) {
|
|
sp--;
|
|
obj1 = TOP();
|
|
SET_TOP(mp_const_none);
|
|
obj2 = mp_call_function_n_kw(obj1, 3, 0, no_exc);
|
|
} else if (MP_OBJ_IS_SMALL_INT(TOP())) {
|
|
mp_obj_t cause = POP();
|
|
switch (MP_OBJ_SMALL_INT_VALUE(cause)) {
|
|
case UNWIND_RETURN: {
|
|
mp_obj_t retval = POP();
|
|
obj2 = mp_call_function_n_kw(TOP(), 3, 0, no_exc);
|
|
SET_TOP(retval);
|
|
PUSH(cause);
|
|
break;
|
|
}
|
|
case UNWIND_JUMP: {
|
|
obj2 = mp_call_function_n_kw(sp[-2], 3, 0, no_exc);
|
|
// Pop __exit__ boundmethod at sp[-2]
|
|
sp[-2] = sp[-1];
|
|
sp[-1] = sp[0];
|
|
SET_TOP(cause);
|
|
break;
|
|
}
|
|
default:
|
|
assert(0);
|
|
}
|
|
} else if (mp_obj_is_exception_type(TOP())) {
|
|
mp_obj_t args[3] = {sp[0], sp[-1], sp[-2]};
|
|
obj2 = mp_call_function_n_kw(sp[-3], 3, 0, args);
|
|
// Pop __exit__ boundmethod at sp[-3]
|
|
// TODO: Once semantics is proven, optimize for case when obj2 == True
|
|
sp[-3] = sp[-2];
|
|
sp[-2] = sp[-1];
|
|
sp[-1] = sp[0];
|
|
sp--;
|
|
if (mp_obj_is_true(obj2)) {
|
|
// This is what CPython does
|
|
//PUSH(MP_OBJ_NEW_SMALL_INT(UNWIND_SILENCED));
|
|
// But what we need to do is - pop exception from value stack...
|
|
sp -= 3;
|
|
// ... pop "with" exception handler, and signal END_FINALLY
|
|
// to just execute finally handler normally (by pushing None
|
|
// on value stack)
|
|
assert(exc_sp >= exc_stack);
|
|
assert(exc_sp->opcode == MP_BC_SETUP_WITH);
|
|
POP_EXC_BLOCK();
|
|
PUSH(mp_const_none);
|
|
}
|
|
} else {
|
|
assert(0);
|
|
}
|
|
DISPATCH();
|
|
}
|
|
|
|
ENTRY(MP_BC_UNWIND_JUMP):
|
|
DECODE_SLABEL;
|
|
PUSH((void*)(ip + unum)); // push destination ip for jump
|
|
PUSH((void*)(machine_uint_t)(*ip)); // push number of exception handlers to unwind
|
|
unwind_jump:
|
|
unum = (machine_uint_t)POP(); // get number of exception handlers to unwind
|
|
while (unum > 0) {
|
|
unum -= 1;
|
|
assert(exc_sp >= exc_stack);
|
|
if (exc_sp->opcode == MP_BC_SETUP_FINALLY || exc_sp->opcode == MP_BC_SETUP_WITH) {
|
|
// We're going to run "finally" code as a coroutine
|
|
// (not calling it recursively). Set up a sentinel
|
|
// on a stack so it can return back to us when it is
|
|
// done (when END_FINALLY reached).
|
|
PUSH((void*)unum); // push number of exception handlers left to unwind
|
|
PUSH(MP_OBJ_NEW_SMALL_INT(UNWIND_JUMP)); // push sentinel
|
|
ip = exc_sp->handler; // get exception handler byte code address
|
|
exc_sp--; // pop exception handler
|
|
goto dispatch_loop; // run the exception handler
|
|
}
|
|
exc_sp--;
|
|
}
|
|
ip = (const byte*)POP(); // pop destination ip for jump
|
|
DISPATCH();
|
|
|
|
// matched against: POP_BLOCK or POP_EXCEPT (anything else?)
|
|
ENTRY(MP_BC_SETUP_EXCEPT):
|
|
ENTRY(MP_BC_SETUP_FINALLY):
|
|
PUSH_EXC_BLOCK();
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_END_FINALLY):
|
|
// not fully implemented
|
|
// if TOS is an exception, reraises the exception (3 values on TOS)
|
|
// if TOS is None, just pops it and continues
|
|
// if TOS is an integer, does something else
|
|
// else error
|
|
if (mp_obj_is_exception_type(TOP())) {
|
|
RAISE(sp[-1]);
|
|
}
|
|
if (TOP() == mp_const_none) {
|
|
sp--;
|
|
} else if (MP_OBJ_IS_SMALL_INT(TOP())) {
|
|
// We finished "finally" coroutine and now dispatch back
|
|
// to our caller, based on TOS value
|
|
mp_unwind_reason_t reason = MP_OBJ_SMALL_INT_VALUE(POP());
|
|
switch (reason) {
|
|
case UNWIND_RETURN:
|
|
goto unwind_return;
|
|
case UNWIND_JUMP:
|
|
goto unwind_jump;
|
|
}
|
|
assert(0);
|
|
} else {
|
|
assert(0);
|
|
}
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_GET_ITER):
|
|
SET_TOP(mp_getiter(TOP()));
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_FOR_ITER):
|
|
DECODE_ULABEL; // the jump offset if iteration finishes; for labels are always forward
|
|
save_sp = sp;
|
|
assert(TOP());
|
|
obj1 = mp_iternext_allow_raise(TOP());
|
|
if (obj1 == MP_OBJ_STOP_ITERATION) {
|
|
--sp; // pop the exhausted iterator
|
|
ip += unum; // jump to after for-block
|
|
} else {
|
|
PUSH(obj1); // push the next iteration value
|
|
}
|
|
DISPATCH();
|
|
|
|
// matched against: SETUP_EXCEPT, SETUP_FINALLY, SETUP_WITH
|
|
ENTRY(MP_BC_POP_BLOCK):
|
|
// we are exiting an exception handler, so pop the last one of the exception-stack
|
|
assert(exc_sp >= exc_stack);
|
|
POP_EXC_BLOCK();
|
|
DISPATCH();
|
|
|
|
// matched against: SETUP_EXCEPT
|
|
ENTRY(MP_BC_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);
|
|
assert(currently_in_except_block);
|
|
//sp = (mp_obj_t*)(*exc_sp--);
|
|
//exc_sp--; // discard ip
|
|
POP_EXC_BLOCK();
|
|
//sp -= 3; // pop 3 exception values
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_NOT):
|
|
if (TOP() == mp_const_true) {
|
|
SET_TOP(mp_const_false);
|
|
} else {
|
|
SET_TOP(mp_const_true);
|
|
}
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_UNARY_OP):
|
|
unum = *ip++;
|
|
SET_TOP(mp_unary_op(unum, TOP()));
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_BINARY_OP):
|
|
unum = *ip++;
|
|
obj2 = POP();
|
|
obj1 = TOP();
|
|
SET_TOP(mp_binary_op(unum, obj1, obj2));
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_BUILD_TUPLE):
|
|
DECODE_UINT;
|
|
sp -= unum - 1;
|
|
SET_TOP(mp_obj_new_tuple(unum, sp));
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_BUILD_LIST):
|
|
DECODE_UINT;
|
|
sp -= unum - 1;
|
|
SET_TOP(mp_obj_new_list(unum, sp));
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_LIST_APPEND):
|
|
DECODE_UINT;
|
|
// I think it's guaranteed by the compiler that sp[unum] is a list
|
|
mp_obj_list_append(sp[-unum], sp[0]);
|
|
sp--;
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_BUILD_MAP):
|
|
DECODE_UINT;
|
|
PUSH(mp_obj_new_dict(unum));
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_STORE_MAP):
|
|
sp -= 2;
|
|
mp_obj_dict_store(sp[0], sp[2], sp[1]);
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_MAP_ADD):
|
|
DECODE_UINT;
|
|
// I think it's guaranteed by the compiler that sp[-unum - 1] is a map
|
|
mp_obj_dict_store(sp[-unum - 1], sp[0], sp[-1]);
|
|
sp -= 2;
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_BUILD_SET):
|
|
DECODE_UINT;
|
|
sp -= unum - 1;
|
|
SET_TOP(mp_obj_new_set(unum, sp));
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_SET_ADD):
|
|
DECODE_UINT;
|
|
// I think it's guaranteed by the compiler that sp[-unum] is a set
|
|
mp_obj_set_store(sp[-unum], sp[0]);
|
|
sp--;
|
|
DISPATCH();
|
|
|
|
#if MICROPY_PY_SLICE
|
|
ENTRY(MP_BC_BUILD_SLICE):
|
|
DECODE_UINT;
|
|
if (unum == 2) {
|
|
obj2 = POP();
|
|
obj1 = TOP();
|
|
SET_TOP(mp_obj_new_slice(obj1, obj2, NULL));
|
|
} else {
|
|
obj1 = mp_obj_new_exception_msg(&mp_type_NotImplementedError, "3-argument slice is not supported");
|
|
nlr_pop();
|
|
fastn[0] = obj1;
|
|
return MP_VM_RETURN_EXCEPTION;
|
|
}
|
|
DISPATCH();
|
|
#endif
|
|
|
|
ENTRY(MP_BC_UNPACK_SEQUENCE):
|
|
DECODE_UINT;
|
|
mp_unpack_sequence(sp[0], unum, sp);
|
|
sp += unum - 1;
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_UNPACK_EX):
|
|
DECODE_UINT;
|
|
mp_unpack_ex(sp[0], unum, sp);
|
|
sp += (unum & 0xff) + ((unum >> 8) & 0xff);
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_MAKE_FUNCTION):
|
|
DECODE_PTR;
|
|
PUSH(mp_make_function_from_raw_code((mp_raw_code_t*)unum, MP_OBJ_NULL, MP_OBJ_NULL));
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_MAKE_FUNCTION_DEFARGS):
|
|
DECODE_PTR;
|
|
// Stack layout: def_tuple def_dict <- TOS
|
|
obj1 = POP();
|
|
SET_TOP(mp_make_function_from_raw_code((mp_raw_code_t*)unum, TOP(), obj1));
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_MAKE_CLOSURE): {
|
|
DECODE_PTR;
|
|
machine_uint_t n_closed_over = *ip++;
|
|
// Stack layout: closed_overs <- TOS
|
|
sp -= n_closed_over - 1;
|
|
SET_TOP(mp_make_closure_from_raw_code((mp_raw_code_t*)unum, n_closed_over, sp));
|
|
DISPATCH();
|
|
}
|
|
|
|
ENTRY(MP_BC_MAKE_CLOSURE_DEFARGS): {
|
|
DECODE_PTR;
|
|
machine_uint_t n_closed_over = *ip++;
|
|
// Stack layout: def_tuple def_dict closed_overs <- TOS
|
|
sp -= 2 + n_closed_over - 1;
|
|
SET_TOP(mp_make_closure_from_raw_code((mp_raw_code_t*)unum, 0x100 | n_closed_over, sp));
|
|
DISPATCH();
|
|
}
|
|
|
|
ENTRY(MP_BC_CALL_FUNCTION):
|
|
DECODE_UINT;
|
|
// unum & 0xff == n_positional
|
|
// (unum >> 8) & 0xff == n_keyword
|
|
sp -= (unum & 0xff) + ((unum >> 7) & 0x1fe);
|
|
SET_TOP(mp_call_function_n_kw(*sp, unum & 0xff, (unum >> 8) & 0xff, sp + 1));
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_CALL_FUNCTION_VAR_KW):
|
|
DECODE_UINT;
|
|
// unum & 0xff == n_positional
|
|
// (unum >> 8) & 0xff == n_keyword
|
|
// We have folowing stack layout here:
|
|
// fun arg0 arg1 ... kw0 val0 kw1 val1 ... seq dict <- TOS
|
|
sp -= (unum & 0xff) + ((unum >> 7) & 0x1fe) + 2;
|
|
SET_TOP(mp_call_method_n_kw_var(false, unum, sp));
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_CALL_METHOD):
|
|
DECODE_UINT;
|
|
// unum & 0xff == n_positional
|
|
// (unum >> 8) & 0xff == n_keyword
|
|
sp -= (unum & 0xff) + ((unum >> 7) & 0x1fe) + 1;
|
|
SET_TOP(mp_call_method_n_kw(unum & 0xff, (unum >> 8) & 0xff, sp));
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_CALL_METHOD_VAR_KW):
|
|
DECODE_UINT;
|
|
// unum & 0xff == n_positional
|
|
// (unum >> 8) & 0xff == n_keyword
|
|
// We have folowing stack layout here:
|
|
// fun self arg0 arg1 ... kw0 val0 kw1 val1 ... seq dict <- TOS
|
|
sp -= (unum & 0xff) + ((unum >> 7) & 0x1fe) + 3;
|
|
SET_TOP(mp_call_method_n_kw_var(true, unum, sp));
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_RETURN_VALUE):
|
|
unwind_return:
|
|
while (exc_sp >= exc_stack) {
|
|
if (exc_sp->opcode == MP_BC_SETUP_FINALLY || exc_sp->opcode == MP_BC_SETUP_WITH) {
|
|
// We're going to run "finally" code as a coroutine
|
|
// (not calling it recursively). Set up a sentinel
|
|
// on a stack so it can return back to us when it is
|
|
// done (when END_FINALLY reached).
|
|
PUSH(MP_OBJ_NEW_SMALL_INT(UNWIND_RETURN));
|
|
ip = exc_sp->handler;
|
|
// We don't need to do anything with sp, finally is just
|
|
// syntactic sugar for sequential execution??
|
|
// sp =
|
|
exc_sp--;
|
|
goto dispatch_loop;
|
|
}
|
|
exc_sp--;
|
|
}
|
|
nlr_pop();
|
|
*sp_in_out = sp;
|
|
assert(exc_sp == exc_stack - 1);
|
|
return MP_VM_RETURN_NORMAL;
|
|
|
|
ENTRY(MP_BC_RAISE_VARARGS):
|
|
unum = *ip++;
|
|
assert(unum <= 1);
|
|
if (unum == 0) {
|
|
// search for the inner-most previous exception, to reraise it
|
|
obj1 = MP_OBJ_NULL;
|
|
for (mp_exc_stack_t *e = exc_sp; e >= exc_stack; e--) {
|
|
if (e->prev_exc != MP_OBJ_NULL) {
|
|
obj1 = e->prev_exc;
|
|
break;
|
|
}
|
|
}
|
|
if (obj1 == MP_OBJ_NULL) {
|
|
obj1 = mp_obj_new_exception_msg(&mp_type_RuntimeError, "No active exception to reraise");
|
|
RAISE(obj1);
|
|
}
|
|
} else {
|
|
obj1 = POP();
|
|
}
|
|
obj1 = mp_make_raise_obj(obj1);
|
|
RAISE(obj1);
|
|
|
|
ENTRY(MP_BC_YIELD_VALUE):
|
|
yield:
|
|
nlr_pop();
|
|
*ip_in_out = ip;
|
|
*sp_in_out = sp;
|
|
*exc_sp_in_out = MP_TAGPTR_MAKE(exc_sp, currently_in_except_block);
|
|
return MP_VM_RETURN_YIELD;
|
|
|
|
ENTRY(MP_BC_YIELD_FROM): {
|
|
//#define EXC_MATCH(exc, type) MP_OBJ_IS_TYPE(exc, type)
|
|
#define EXC_MATCH(exc, type) mp_obj_exception_match(exc, type)
|
|
#define GENERATOR_EXIT_IF_NEEDED(t) if (t != MP_OBJ_NULL && EXC_MATCH(t, &mp_type_GeneratorExit)) { RAISE(t); }
|
|
mp_vm_return_kind_t ret_kind;
|
|
obj1 = POP();
|
|
mp_obj_t t_exc = MP_OBJ_NULL;
|
|
if (inject_exc != MP_OBJ_NULL) {
|
|
t_exc = inject_exc;
|
|
inject_exc = MP_OBJ_NULL;
|
|
ret_kind = mp_resume(TOP(), MP_OBJ_NULL, t_exc, &obj2);
|
|
} else {
|
|
ret_kind = mp_resume(TOP(), obj1, MP_OBJ_NULL, &obj2);
|
|
}
|
|
|
|
if (ret_kind == MP_VM_RETURN_YIELD) {
|
|
ip--;
|
|
PUSH(obj2);
|
|
goto yield;
|
|
}
|
|
if (ret_kind == MP_VM_RETURN_NORMAL) {
|
|
// Pop exhausted gen
|
|
sp--;
|
|
if (obj2 == MP_OBJ_NULL) {
|
|
// Optimize StopIteration
|
|
// TODO: get StopIteration's value
|
|
PUSH(mp_const_none);
|
|
} else {
|
|
PUSH(obj2);
|
|
}
|
|
|
|
// If we injected GeneratorExit downstream, then even
|
|
// if it was swallowed, we re-raise GeneratorExit
|
|
GENERATOR_EXIT_IF_NEEDED(t_exc);
|
|
DISPATCH();
|
|
}
|
|
if (ret_kind == MP_VM_RETURN_EXCEPTION) {
|
|
// Pop exhausted gen
|
|
sp--;
|
|
if (EXC_MATCH(obj2, &mp_type_StopIteration)) {
|
|
PUSH(mp_obj_exception_get_value(obj2));
|
|
// If we injected GeneratorExit downstream, then even
|
|
// if it was swallowed, we re-raise GeneratorExit
|
|
GENERATOR_EXIT_IF_NEEDED(t_exc);
|
|
DISPATCH();
|
|
} else {
|
|
RAISE(obj2);
|
|
}
|
|
}
|
|
}
|
|
|
|
ENTRY(MP_BC_IMPORT_NAME):
|
|
DECODE_QSTR;
|
|
obj1 = POP();
|
|
SET_TOP(mp_import_name(qst, obj1, TOP()));
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_IMPORT_FROM):
|
|
DECODE_QSTR;
|
|
obj1 = mp_import_from(TOP(), qst);
|
|
PUSH(obj1);
|
|
DISPATCH();
|
|
|
|
ENTRY(MP_BC_IMPORT_STAR):
|
|
mp_import_all(POP());
|
|
DISPATCH();
|
|
|
|
ENTRY_DEFAULT:
|
|
obj1 = mp_obj_new_exception_msg(&mp_type_NotImplementedError, "byte code not implemented");
|
|
nlr_pop();
|
|
fastn[0] = obj1;
|
|
return MP_VM_RETURN_EXCEPTION;
|
|
|
|
#if !MICROPY_OPT_COMPUTED_GOTO
|
|
} // switch
|
|
#endif
|
|
} // for loop
|
|
|
|
} else {
|
|
exception_handler:
|
|
// exception occurred
|
|
|
|
// check if it's a StopIteration within a for block
|
|
if (*save_ip == MP_BC_FOR_ITER && mp_obj_is_subclass_fast(mp_obj_get_type(nlr.ret_val), &mp_type_StopIteration)) {
|
|
const byte *ip = save_ip + 1;
|
|
machine_uint_t unum;
|
|
DECODE_ULABEL; // the jump offset if iteration finishes; for labels are always forward
|
|
*ip_in_out = ip + unum; // jump to after for-block
|
|
*sp_in_out = save_sp - 1; // pop the exhausted iterator
|
|
goto outer_dispatch_loop; // continue with dispatch loop
|
|
}
|
|
|
|
// set file and line number that the exception occurred at
|
|
// TODO: don't set traceback for exceptions re-raised by END_FINALLY.
|
|
// But consider how to handle nested exceptions.
|
|
// TODO need a better way of not adding traceback to constant objects (right now, just GeneratorExit_obj and MemoryError_obj)
|
|
if (mp_obj_is_exception_instance(nlr.ret_val) && nlr.ret_val != &mp_const_GeneratorExit_obj && nlr.ret_val != &mp_const_MemoryError_obj) {
|
|
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; *ci && bc >= ((*ci) & 31); ci++) {
|
|
bc -= *ci & 31;
|
|
source_line += *ci >> 5;
|
|
}
|
|
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);
|
|
|
|
// 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
|
|
POP_EXC_BLOCK();
|
|
}
|
|
|
|
if (exc_sp >= exc_stack) {
|
|
// set flag to indicate that we are now handling an exception
|
|
currently_in_except_block = 1;
|
|
|
|
// catch exception and pass to byte code
|
|
*ip_in_out = exc_sp->handler;
|
|
mp_obj_t *sp = MP_TAGPTR_PTR(exc_sp->val_sp);
|
|
// save this exception in the stack so it can be used in a reraise, if needed
|
|
exc_sp->prev_exc = nlr.ret_val;
|
|
// push(traceback, exc-val, exc-type)
|
|
PUSH(mp_const_none);
|
|
PUSH(nlr.ret_val);
|
|
PUSH(mp_obj_get_type(nlr.ret_val));
|
|
*sp_in_out = sp;
|
|
|
|
} else {
|
|
// propagate exception to higher level
|
|
// TODO what to do about ip and sp? they don't really make sense at this point
|
|
fastn[0] = nlr.ret_val; // must put exception here because sp is invalid
|
|
return MP_VM_RETURN_EXCEPTION;
|
|
}
|
|
}
|
|
}
|
|
}
|