mirror of
https://github.com/licsber/micropython.git
synced 2024-09-20 17:10:24 +08:00
69b89d21b2
This simplifies the compiler a little, since now it can do 1 pass over a function declaration, to determine default arguments. I would have done this originally, but CPython 3.3 somehow had the default keyword args compiled before the default position args (even though they appear in the other order in the text of the script), and I thought it was important to have the same order of execution when evaluating default arguments. CPython 3.4 has changed the order to the more obvious one, so we can also change.
968 lines
40 KiB
C
968 lines
40 KiB
C
#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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#include "objgenerator.h"
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#define DETECT_VM_STACK_OVERFLOW (0)
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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 { \
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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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}
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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 { \
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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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}
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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 = op; \
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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_byte_code(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[10];
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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 > 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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// allocate state for exceptions
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mp_exc_stack_t exc_state[4];
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mp_exc_stack_t *exc_stack = &exc_state[0];
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if (n_exc_stack > 4) {
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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_byte_code_2(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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switch (vm_return_kind) {
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case MP_VM_RETURN_NORMAL:
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*ret = *sp;
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return MP_VM_RETURN_NORMAL;
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case MP_VM_RETURN_EXCEPTION:
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*ret = state[n_state - 1];
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return MP_VM_RETURN_EXCEPTION;
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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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return MP_VM_RETURN_NORMAL;
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}
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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_byte_code_2(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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// 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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nlr_buf_t nlr;
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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; // 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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// outer exception handling loop
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for (;;) {
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outer_dispatch_loop:
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if (nlr_push(&nlr) == 0) {
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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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mp_obj_t t = inject_exc;
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inject_exc = MP_OBJ_NULL;
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nlr_raise(mp_make_raise_obj(t));
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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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save_ip = ip;
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int op = *ip++;
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//printf("ip=%p sp=%p op=%u\n", save_ip, sp, op);
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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_obj_t)&mp_const_ellipsis_obj);
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break;
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case 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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break;
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}
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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(mp_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(mp_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(mp_load_const_bytes(qst));
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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(mp_load_const_str(qst));
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break;
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case MP_BC_LOAD_NULL:
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PUSH(MP_OBJ_NULL);
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break;
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case MP_BC_LOAD_FAST_0:
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PUSH(fastn[0]);
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break;
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case MP_BC_LOAD_FAST_1:
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PUSH(fastn[-1]);
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break;
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case MP_BC_LOAD_FAST_2:
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PUSH(fastn[-2]);
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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_FAST_CHECKED:
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DECODE_UINT;
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obj1 = fastn[-unum];
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if (obj1 == MP_OBJ_NULL) {
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local_name_error:
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nlr_raise(mp_obj_new_exception_msg(&mp_type_NameError, "local variable referenced before assignment"));
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}
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PUSH(obj1);
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break;
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case 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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if (obj1 == MP_OBJ_NULL) {
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goto local_name_error;
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}
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PUSH(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(mp_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(mp_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(mp_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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mp_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(mp_load_build_class());
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break;
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case MP_BC_STORE_FAST_0:
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fastn[0] = POP();
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break;
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case MP_BC_STORE_FAST_1:
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fastn[-1] = POP();
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break;
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case MP_BC_STORE_FAST_2:
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fastn[-2] = 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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mp_obj_cell_set(fastn[-unum], 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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mp_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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mp_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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mp_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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mp_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_DELETE_FAST:
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DECODE_UINT;
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if (fastn[-unum] == MP_OBJ_NULL) {
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goto local_name_error;
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}
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fastn[-unum] = MP_OBJ_NULL;
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break;
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case MP_BC_DELETE_DEREF:
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DECODE_UINT;
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if (mp_obj_cell_get(fastn[-unum]) == MP_OBJ_NULL) {
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goto local_name_error;
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}
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mp_obj_cell_set(fastn[-unum], MP_OBJ_NULL);
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break;
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case MP_BC_DELETE_NAME:
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DECODE_QSTR;
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mp_delete_name(qst);
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break;
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case MP_BC_DELETE_GLOBAL:
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DECODE_QSTR;
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mp_delete_global(qst);
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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 (mp_obj_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 (!mp_obj_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 (mp_obj_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 (mp_obj_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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case MP_BC_SETUP_WITH:
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obj1 = TOP();
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SET_TOP(mp_load_attr(obj1, MP_QSTR___exit__));
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mp_load_method(obj1, MP_QSTR___enter__, sp + 1);
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obj2 = mp_call_method_n_kw(0, 0, sp + 1);
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PUSH_EXC_BLOCK();
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PUSH(obj2);
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break;
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case MP_BC_WITH_CLEANUP: {
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// Arriving here, there's "exception control block" on top of stack,
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// and __exit__ bound method underneath it. Bytecode calls __exit__,
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// and "deletes" it off stack, shifting "exception control block"
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// to its place.
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static const mp_obj_t no_exc[] = {mp_const_none, mp_const_none, mp_const_none};
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if (TOP() == mp_const_none) {
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sp--;
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obj1 = TOP();
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SET_TOP(mp_const_none);
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obj2 = mp_call_function_n_kw(obj1, 3, 0, no_exc);
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} else if (MP_OBJ_IS_SMALL_INT(TOP())) {
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mp_obj_t cause = POP();
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switch (MP_OBJ_SMALL_INT_VALUE(cause)) {
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case UNWIND_RETURN: {
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mp_obj_t retval = POP();
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obj2 = mp_call_function_n_kw(TOP(), 3, 0, no_exc);
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SET_TOP(retval);
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PUSH(cause);
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break;
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}
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case UNWIND_JUMP: {
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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);
|
|
}
|
|
break;
|
|
}
|
|
|
|
case 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
|
|
break;
|
|
|
|
// matched against: POP_BLOCK or POP_EXCEPT (anything else?)
|
|
case MP_BC_SETUP_EXCEPT:
|
|
case MP_BC_SETUP_FINALLY:
|
|
PUSH_EXC_BLOCK();
|
|
break;
|
|
|
|
case 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())) {
|
|
nlr_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);
|
|
}
|
|
break;
|
|
|
|
case MP_BC_GET_ITER:
|
|
SET_TOP(mp_getiter(TOP()));
|
|
break;
|
|
|
|
case MP_BC_FOR_ITER:
|
|
DECODE_ULABEL; // the jump offset if iteration finishes; for labels are always forward
|
|
obj1 = mp_iternext_allow_raise(TOP());
|
|
if (obj1 == MP_OBJ_NULL) {
|
|
--sp; // pop the exhausted iterator
|
|
ip += unum; // jump to after for-block
|
|
} else {
|
|
PUSH(obj1); // push the next iteration value
|
|
}
|
|
break;
|
|
|
|
// matched against: SETUP_EXCEPT, SETUP_FINALLY, SETUP_WITH
|
|
case 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();
|
|
break;
|
|
|
|
// matched against: SETUP_EXCEPT
|
|
case 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
|
|
break;
|
|
|
|
case MP_BC_NOT:
|
|
if (TOP() == mp_const_true) {
|
|
SET_TOP(mp_const_false);
|
|
} else {
|
|
SET_TOP(mp_const_true);
|
|
}
|
|
break;
|
|
|
|
case MP_BC_UNARY_OP:
|
|
unum = *ip++;
|
|
SET_TOP(mp_unary_op(unum, TOP()));
|
|
break;
|
|
|
|
case MP_BC_BINARY_OP:
|
|
unum = *ip++;
|
|
obj2 = POP();
|
|
obj1 = TOP();
|
|
SET_TOP(mp_binary_op(unum, obj1, obj2));
|
|
break;
|
|
|
|
case MP_BC_BUILD_TUPLE:
|
|
DECODE_UINT;
|
|
sp -= unum - 1;
|
|
SET_TOP(mp_obj_new_tuple(unum, sp));
|
|
break;
|
|
|
|
case MP_BC_BUILD_LIST:
|
|
DECODE_UINT;
|
|
sp -= unum - 1;
|
|
SET_TOP(mp_obj_new_list(unum, sp));
|
|
break;
|
|
|
|
case 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--;
|
|
break;
|
|
|
|
case MP_BC_BUILD_MAP:
|
|
DECODE_UINT;
|
|
PUSH(mp_obj_new_dict(unum));
|
|
break;
|
|
|
|
case MP_BC_STORE_MAP:
|
|
sp -= 2;
|
|
mp_obj_dict_store(sp[0], sp[2], sp[1]);
|
|
break;
|
|
|
|
case 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;
|
|
break;
|
|
|
|
case MP_BC_BUILD_SET:
|
|
DECODE_UINT;
|
|
sp -= unum - 1;
|
|
SET_TOP(mp_obj_new_set(unum, sp));
|
|
break;
|
|
|
|
case 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--;
|
|
break;
|
|
|
|
#if MICROPY_ENABLE_SLICE
|
|
case 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;
|
|
}
|
|
break;
|
|
#endif
|
|
|
|
case MP_BC_UNPACK_SEQUENCE:
|
|
DECODE_UINT;
|
|
mp_unpack_sequence(sp[0], unum, sp);
|
|
sp += unum - 1;
|
|
break;
|
|
|
|
case MP_BC_UNPACK_EX:
|
|
DECODE_UINT;
|
|
mp_unpack_ex(sp[0], unum, sp);
|
|
sp += (unum & 0xff) + ((unum >> 8) & 0xff);
|
|
break;
|
|
|
|
case MP_BC_MAKE_FUNCTION:
|
|
DECODE_UINT;
|
|
PUSH(mp_make_function_from_id(unum, MP_OBJ_NULL, MP_OBJ_NULL));
|
|
break;
|
|
|
|
case MP_BC_MAKE_FUNCTION_DEFARGS:
|
|
DECODE_UINT;
|
|
// Stack layout: def_tuple def_dict <- TOS
|
|
obj1 = POP();
|
|
SET_TOP(mp_make_function_from_id(unum, TOP(), obj1));
|
|
break;
|
|
|
|
case MP_BC_MAKE_CLOSURE:
|
|
DECODE_UINT;
|
|
// Stack layout: closure_tuple <- TOS
|
|
SET_TOP(mp_make_closure_from_id(unum, TOP(), MP_OBJ_NULL, MP_OBJ_NULL));
|
|
break;
|
|
|
|
case MP_BC_MAKE_CLOSURE_DEFARGS:
|
|
DECODE_UINT;
|
|
// Stack layout: def_tuple def_dict closure_tuple <- TOS
|
|
obj1 = POP();
|
|
obj2 = POP();
|
|
SET_TOP(mp_make_closure_from_id(unum, obj1, TOP(), obj2));
|
|
break;
|
|
|
|
case 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));
|
|
break;
|
|
|
|
case 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));
|
|
break;
|
|
|
|
case 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));
|
|
break;
|
|
|
|
case 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));
|
|
break;
|
|
|
|
case 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;
|
|
|
|
case 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) {
|
|
nlr_raise(mp_obj_new_exception_msg(&mp_type_RuntimeError, "No active exception to reraise"));
|
|
}
|
|
} else {
|
|
obj1 = POP();
|
|
}
|
|
nlr_raise(mp_make_raise_obj(obj1));
|
|
|
|
case 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;
|
|
|
|
case 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)) { nlr_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);
|
|
break;
|
|
}
|
|
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);
|
|
break;
|
|
} else {
|
|
nlr_raise(obj2);
|
|
}
|
|
}
|
|
}
|
|
|
|
case MP_BC_IMPORT_NAME:
|
|
DECODE_QSTR;
|
|
obj1 = POP();
|
|
SET_TOP(mp_import_name(qst, obj1, TOP()));
|
|
break;
|
|
|
|
case MP_BC_IMPORT_FROM:
|
|
DECODE_QSTR;
|
|
obj1 = mp_import_from(TOP(), qst);
|
|
PUSH(obj1);
|
|
break;
|
|
|
|
case MP_BC_IMPORT_STAR:
|
|
mp_import_all(POP());
|
|
break;
|
|
|
|
default:
|
|
printf("code %p, byte code 0x%02x not implemented\n", ip, op);
|
|
obj1 = mp_obj_new_exception_msg(&mp_type_NotImplementedError, "byte code not implemented");
|
|
nlr_pop();
|
|
fastn[0] = obj1;
|
|
return MP_VM_RETURN_EXCEPTION;
|
|
}
|
|
}
|
|
|
|
} else {
|
|
// 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)) {
|
|
ip = save_ip + 1;
|
|
DECODE_ULABEL; // the jump offset if iteration finishes; for labels are always forward
|
|
--sp; // pop the exhausted iterator
|
|
ip += unum; // jump to after for-block
|
|
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
|
|
sp = MP_TAGPTR_PTR(exc_sp->val_sp);
|
|
ip = exc_sp->handler;
|
|
// 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));
|
|
|
|
} 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;
|
|
}
|
|
}
|
|
}
|
|
}
|